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Prof. Dr. Dmitry Rychkov

Nachhaltige Kunststofftechnik Smart Materials Faserverbundwerkstoffe

Wissenschaftliche Leitung

Wissenschaftlicher Leiter Technologiezentrum kunststoffcampus Bayern, Technologie- und Studienzentrum Weißenburg


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Zeitschriftenartikel

  • A. Rychkov
  • Kuznetsov, A.
  • A. Gulyakova
  • Dmitry Rychkov

Surface Potential Decay of Corona Charged Polyethylene Films: Influence of Deep Surface Traps

In: IEEE Transactions on Dielectrics and Electrical Insulation vol. 28 pg. 1933-1937.

  • (2021)

DOI: 10.1109/TDEI.2021.009698

Electret properties of low-density polyethylene (LDPE) films are investigated in the range of relatively low (up to 10 7 V/m) electrical fields. Thermally stimulated surface potential decay and thermally stimulated surface potential recovery reveal that LDPE films show no “cross-over” phenomenon and space charge accumulation in the polymer volume. The deepest traps with an energy of 1.1–1.2 eV are localized in the thin near-surface polymer layers. During poling (independent of the initial surface potential value), a part of the charge is captured in the deep traps that have limited concentration. Moreover, such deep traps can be filled also via the sequence of trapping and release events from the shallower traps located in the near-surface layer.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Wang, J.
  • Dmitry Rychkov
  • Q. Nguyen
  • Gerhard, R.

Unexpected bipolar space-charge polarization across transcrystalline interfaces in polypropylene electret films

In: Journal of Applied Physics vol. 128 pg. 134103.

  • (2020)

DOI: 10.1063/5.0022071

A double-layer transcrystalline polypropylene (PP) film with a flat central interface layer between its two transcrystalline layers is obtained by recrystallization from the melt between two polytetrafluoroethylene (PTFE) surfaces on both sides of the PP film. Its electret properties are studied and compared with those of a single-layer transcrystalline PP film re-crystallized in contact with only one PTFE surface. Within experimental uncertainty, the two types of transcrystalline films exhibit the same thermal properties and crystallinities. After thermal poling, however, two hetero-charge layers of opposite polarity are found on the internal interfaces of the double-layer transcrystalline films and may together be considered as micrometer-sized dipoles. The unexpected phenomenon does not occur in single-layer transcrystalline samples without a central interface layer, suggesting that the interfaces between the transcrystalline layers and the micrometer-thick central interface layer may be the origin of deeper traps rather than the crystalline structures in the transcrystallites or the spherulites. The origin of the interfacial charges was also studied by means of an injection-blocking charging method, which revealed that intrinsic charge carriers introduced during recrystallization are most likely responsible for the interfacial charges. It is fascinating that a material as familiar as PP can exhibit such intriguing properties with a special bipolar space-charge polarization across the central interface layer after quasi-epitaxial surface moulding into a double-layer transcrystalline form. In addition to applications in electret (micro-)devices for electro-mechanical transduction, the highly ordered structures may also be employed as a new paradigm for studying charge storage and transport in polymer electrets and in dielectrics for DC electrical insulation.
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov

Controlling Trapping Parameters via Polymer Structure and Composition? (Keynote)

pg. 22.

  • (2019)
Space-charge electrets are usually fabricated from non-polar polymers. Such materials as polyethylene, polypropylene, polytetrafluoroethylene and its copolymers are used in electret microphones, filters, radiation dosimeters, and different kinds of electromechanical transducers, as well as in biomedical devices [1]. The key factor in all these applications is both thermal and temporal stability of the electret charge. However, the existing materials do not always possess the required level of charge stability. Or, on the other hand, a material may be an excellent electret, but lack in processability, cost efficiency etc. In general, there is a need to be able to control electret properties of commercially available polymer materials used in various electroactive applications. Here we will discuss how changes in chemical composition and structural changes can influence electret charge storage and transport in non-polar polymers.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Dmitry Rychkov
  • Altafim, R.A.P.

Template-based fluoroethylenepropylene ferroelectrets with enhanced thermal stability of piezoelectricity

In: Journal of Applied Physics vol. 124 pg. 174105.

  • (2018)

DOI: 10.1063/1.5041374

In ferroelectrets, the piezoelectricity stems from the charges of both polarities trapped on the inner surfaces of the cavities in the material, so that its thermal stability is defined by the stability of the respective charges. In the present work, a template-based lamination technique has been employed to fabricate tubular-channel ferroelectrets from fluoroethylenepropylene (FEP) films. It has been shown that the piezoelectricity in FEP ferroelectrets decays at relatively low temperatures due to the inherently lower thermal stability of the positive charge. In order to improve charge trapping, we have treated both FEP films and inner surfaces of the ferroelectret cavities with titanium-tetrachloride vapor, using the atomic-layer-deposition technique. Using surface-potential-decay measurements on FEP films, we have found that the charge-decay curves shift by more than 100 ∘C to the higher temperatures as a result of the surface treatment. Direct measurements of piezoelectric d33 coefficients as a function of temperature have shown that the piezoelectric stability is likewise improved with the d33-decay curves shifted by 60 ∘C to the right. The improvement of electret/ferroelectret properties can be attributed to the formation of the deeper traps on the chemically modified FEP surface. SEM micrographs and EDS analysis reveal island-like structures with titanium- and oxygen-containing species that can be responsible for the deeper trapping of the electret charges.
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Wang, J.
  • Dmitry Rychkov
  • Gerhard, R.

Influence of Charge Density on Charge Decay in Chemically Modified Polypropylene Films

pg. 549-552.

Budapest, Hungary

  • (2018)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Rychkov, A. A.
  • V. Stojharov
  • Kuznetsov, A.
  • Dmitry Rychkov

The Influence of Recrystallization Regimes on Electret Charge Stability in Low-Density Polyethylene Films

pg. 740-743.

Budapest, Hungary

  • (2018)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Cheilakou, E.
  • Tsopelas, N.
  • Anastasopoulos, A.
  • Kourousis, D.
  • Dmitry Rychkov
  • Gerhard, R.
  • Frankenstein, B.
  • Amditis, A.
  • Damigos, Y.
  • Bouklas, C.

Strain monitoring system for steel and concrete structures

In: Procedia Structural Integrity vol. 10 pg. 25-32.

  • (2018)

DOI: 10.1016/j.prostr.2018.09.005

The present work is part of a collaborative H2020 European funded research project called SENSKIN, that aims to improve Structural Health Monitoring (SHM) for transport infrastructure through the development of an innovative monitoring and management system for bridges based on a novel, inexpensive, skin-like sensor. The integrated SENSKIN technology will be implemented in the case of steel and concrete bridges, and tested, field-evaluated and benchmarked on actual bridge environment against a conventional health monitoring solution developed by Mistras Group Hellas. The main objective of the present work is to implement the autonomous, fully functional strain monitoring system based on commercially available off-the-shelf components, that will be used to accomplish direct comparison between the performance of the innovative SENSKIN sensors and the conventional strain sensors commonly used for structural monitoring of bridges. For this purpose, the mini Structural Monitoring System (mini SMS) of Physical Acoustics Corporation, a comprehensive data acquisition unit designed specifically for long-term unattended operation in outdoor environments, was selected. For the completion of the conventional system, appropriate foil-type strain sensors were selected, driven by special conditioners manufactured by Mistras Group. A comprehensive description of the strain monitoring system and its peripheral components is provided in this paper. For the evaluation of the integrated system’s performance and the effect of various parameters on the long-term behavior of sensors, several test steel pieces instrumented with different strain sensors configurations were prepared and tested in both laboratory and field ambient conditions. Furthermore, loading tests were performed aiming to validate the response of the system in monitoring the strains developed in steel beam elements subject to bending regimes. Representative results obtained from the above experimental tests have been included in this paper as well.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Schulze, M.
  • Gerhard, R.

Soft Capacitive Sensors for Structural Health Monitoring

pg. 311-313.

  • (2017)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Q. Nguyen
  • Wang, J.
  • Dmitry Rychkov
  • Gerhard, R.

Piezoelectrically generated Pressure Steps (PPS) for studying charge distributions on corona-charged Polypropylene (PP) films

Leuven, Belgium

  • (2017)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Wang, J.
  • Dmitry Rychkov
  • Gerhard, R.

Influence of foreign chemical structures from nitric acid treatment on electret and electrical-insulation properties of polypropylene

Leuven, Belgium

  • (2017)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Wirges, W.
  • Qiu, X.
  • Dmitry Rychkov
  • Gerhard, R.

Pressure dependence of the piezoelectric d33 coefficient and the cellular-foam structure in polypropylene ferro- and piezoelectrets

Leuven, Belgium

  • (2017)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Gerhard, R.
  • Kuznetsov, A.
  • Rychkov, A. A.

Trap-energy spectrum in corona-charged polytetrafluoroethylene (PTFE) electret films with modified surfaces

Leuven, Belgium

  • (2017)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Wang, J.
  • Dmitry Rychkov
  • Gerhard, R.

Influence of surface modifications with orthophosphoric acid on the charge stability of polypropylene electrets

pg. 78-80.

  • (2016)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Altafim, R.A.P.

Polymer Electrets and Ferroelectrets as EAPs: Models" Book chapter in "Electromechanically Active Polymers"

In: Electromechanically Active Polymers. A Concise Reference (Polymers and Polymeric Composites: A Reference Series) pg. 1-15.

Cham

  • (2016)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Gerhard, R.
  • Kuznetsov, A.
  • Rychkov, A. A.

Modelling the Isothermal Charge Decay of Modified PTFE Electrets from their Thermally Stimulated Discharge

pg. 105-108.

  • (2016)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Loupos, K.
  • Amditis, A.
  • A. Tsertou
  • Damigos, Y.
  • Gerhard, R.
  • Dmitry Rychkov
  • Wirges, W.
  • V. Kalidromitis
  • S. Camarinopoulos
  • S. Lenas
  • V. Tsaoussidisa
  • Anastasopoulos, A.
  • K. Lenz
  • S. Schneider
  • M. Hill
  • A. Adesiyun
  • Frankenstein, B.

Skin-like Sensor Enabled Bridge Structural Health Monitoring System

Bilbao, Spain

  • (2016)
Structural Health Monitoring (SHM) has an important role in the management of transport infrastructure. However, most SHM techniques are based on data obtained from dense networks of point-based sensors (rather than sparse networks of spatial sensors) and so, inrelative terms, they are costly to implement. Most commercially available strain sensors have a limited maximum range - typically 1% to 2% - and are not well-suited to providing information of a severe loss of structural integrity. The SENSKIN project develops a dielectric-elastomer and micro-electronics-based skin-like sensor, based on the use of a largehighly extensible capacitance sensing membrane and advanced micro-electronic circuitry, for monitoring transport infrastructure - such as bridges. The sensor will provide spatial measurements of strain of more than 10% and is being designed to (a) require low power to operate, (b) be easy to install (c) have a comparable or lower cost than conventional strain sensors, (d) allow simple signal processing, and (e) have the ability to self-monitor and self-report. The system will support the new and emerging technology of Delay/Disruption-Tolerant Networking to secure that strain measurements acquired will reach the base station even under extreme conditions where communications may be disrupted. SENSKIN also develops a Decision-Support-System (DSS) for proactive condition-based structural interventions under normal operating conditions and reactive emergency intervention following an extreme event. In assessing potential rehabilitation options, the DSS will use the data supplied by the SENSKIN sensors together with advanced structural analysis models, whilst taking account of the lifecycle economic, social and environmental implications. The overall monitoring system will be evaluated and benchmarked on actual bridges of Egnatia Highway (Greece) and Bosporus Bridge (Turkey). This paper describes the concept and principles of the SENSKIN sensing system, and its various components with attention to end-user requirements, specifications and system architecture.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Gerhard, R.
  • Kuznetsov, A.
  • Rychkov, A. A.

Energy Spectrum of Surface Traps on Teflon-FEP Films Modified with Titanium-Tetrachloride Vapor

pg. 169-171.

Montpellier, France

  • (2016)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Wirges, W.
  • Gerhard, R.
  • Altafim, R.A.P.

Unipolar Teflon -FEP Ferroelectrets – Choice of Negative Electret Charge Enhances Stability

pg. 84-86.

  • (2015)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Patent

  • Gerhard, R.
  • Dmitry Rychkov
  • Wirges, W.
  • et al.

Electromechanical transducer device for use in e.g. actuator device, has electret material having predetermined electrical charge, which is provided between electro-active layers

  • 26.08.2015 (2015)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Patent

  • Efimov, N.
  • Y. Julenets
  • A. Kuznetsov
  • Dmitry Rychkov
  • et al.

Method of film electret production involves application of fluoropolymer layer onto metal electrode

  • 20.09.2014 (2014)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Altafim, R.A.P.
  • Efimov, N.
  • Gerhard, R.

Improved thermal stability of FEP ferroelectrets through inner voids surface modification

pg. 160-162.

  • (2014)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov

Stabilization of Electric Charges on Self-Organized Nano-Islands

  • (2014)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • M. Khorasani
  • M. Kollosche
  • Wirges, W.
  • Gerhard, R.

The Influence of Carbon-Nanotube Electrodes on the Charge Decay in Silicone-Elastomer Films for Electro-Electret Applications

  • (2014)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Wirges, W.
  • Gerhard, R.
  • Rychkov, A. A.
  • A. Malygin
  • Efimov, N.

Stabilization of Positive Charge on FEP Electret Films Modified with Titanium-Tetrachloride Vapor: Formation of a Two-Dimensional Nanodielectric?

pg. 374-376.

  • (2013)

DOI: 10.1109/ICSD.2013.6619860

It has been shown recently that the stability of positively corona-charged polytetrafluoroethylene (PTFE) electrets is considerably enhanced as a result of a surface treatment with titanium-tetrachloride (TiCl 4 ) vapor. In the present study, we investigate the influence of a gas-phase treatment with TiCl 4 on the electret properties of tetrafluoroethylene-hexafluoropropylene copolymer (FEP) films. FEP-film samples were treated with titanium-tetrachloride vapor by means of a nanotechnological chemical process that is based on molecular-layer deposition. Subsequently, the samples were poled in a positive corona discharge at room temperature. A very significant improvement of the surface-charge stability has been observed on the modified FEP films. The phenomenon is not restricted to the thermal stability of the surface charge, but is also found in long-term charge-decay measurements. Typical relaxation times for positive charge under isothermal conditions are at least one order of magnitude higher after the surface modification. Thermally-stimulated-decay data indicate that the half-value temperatures of the vapor-treated samples have been enhanced to almost 200°C. Thus, the thermal stability of positive charge in modified FEP films may reach values that were so far only obtained on negatively charged FEP electrets. The results are discussed in connection with the formation of deep traps on the chemically modified polymer surfaces and in the context of two-dimensional surface-layer nanodielectrics.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Dmitry Rychkov
  • Kuznetsov, A.
  • Rychkov, A. A.

Thermally Stimulated Electret Surface Potential Recovery in Polyethylene Films Modified in Phosphorus Trichloride Vapor . (in Russian)

In: Izvestiya RGPU: Scientific Journal vol. 157 pg. 113-118.

  • (2013)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Buch (Monographie)

  • Dmitry Rychkov
  • Kuznetsov, A.
  • Rychkov, A. A.

СТАБИЛИЗАЦИЯ ЗАРЯДА ПОЛИМЕРНЫХ ЭЛЕКТРЕТОВ (Charge stabilization in polymer electrets) . A textbook for Engineering or Physics bachelor/master students

RGPU Publishing St-Petersburg

  • (2013)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Wirges, W.
  • Gerhard, R.
  • Rychkov, A. A.

Triboelectrification and Thermal Stability of Positive Charge on Polytetrafluoroethylene Electret Films

pg. 658-660.

Piscataway, NJ, USA

  • (2012)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Dmitry Rychkov
  • Gerhard, R.
  • Ivanov, V.
  • Rychkov, A. A.

Enhanced electret charge stability on polyethylene films treated with titanium-tetrachloride vapor

In: IEEE Transactions on Dielectrics and Electrical Insulation vol. 19 pg. 1305-1311.

  • (2012)

DOI: 10.1109/TDEI.2012.6260005

Low-density polyethylene (LDPE) films have been treated with titanium-tetrachloride vapor by means of the molecular-layer-deposition method. It is shown that such a treatment leads to a considerable improvement of the electret properties for both positively and negatively charged films. The temperature stability of the electret homo-charge has been increased by approximately 60°C. At the same time, the temporal stability of charge is also considerably improved. Modified low-density polyethylene films show no “cross-over phenomenon” when charged to higher voltages. Thus, it is now possible to produce electrets from polyethylene films with high initial charge densities, but without a strongly reduced charge stability. The influence of a chemical treatment with titanium-tetrachloride vapor on charge injection from aluminum electrodes into polyethylene films was also investigated. It is found that the interface between an aluminum electrode and a modified LDPE surface layer has different injection properties for positive and negative charges. Electrons can be injected across the modified interface, whereas injection of holes is either very limited or non-existent.
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Zeitschriftenartikel

  • Dmitry Rychkov
  • Yablokov, M.
  • Rychkov, A. A.

Chemical and physical surface modification of PTFE films—an approach to produce stable electrets

In: Applied Physics A - Materials Science and Processing vol. 107 pg. 589-596.

  • (2012)

DOI: 10.1007/s00339-012-6834-5

The thermal stability of positive charge has been investigated in chemically and physically treated polytetrafluoroethylene (PTFE) films. It has been found that virgin films, oriented by the manufacturer, display an increase in thermal stability of positive charge with an increase of the initial value of surface potential. Such an anomalous behavior is explained by the influence of a negative tribocharge, trapped some small distance below the surface. In PTFE samples treated with orthophosphoric acid and with tetraethoxysilane, a considerable improvement of positive charge stability has been achieved, but no influence of the initial value of surface potential has been observed. However, this influence should be kept in mind when comparing charge stability in virgin and modified samples. In nonoriented PTFE films, no influence of the initial value of surface potential on charge stability has been observed. This could be due to the fact that these films did not possess a noticeable negative tribocharge. After the treatment in glow-discharge defluorination, oxidation and appearance of polar groups have been detected on the surface. These changes in chemical composition of a PTFE surface resulted in a noticeable improvement in thermal stability of positively charged electrets. This improvement is attributed to the formation of deeper traps on the modified surface.
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Zeitschriftenartikel

  • Dmitry Rychkov
  • Kuznetsov, A.
  • Rychkov, A. A.

Electret Properties of Polyethylene and Polytetrafluoroethylene Films with Chemically Modified Surface

In: IEEE Transactions on Dielectrics and Electrical Insulation vol. 18 pg. 8-14.

  • (2011)

DOI: 10.1109/TDEI.2011.5704487

This paper investigates the effect of chemical surface modification of polytetrafluoroethylene (PTFE) and low density polyethylene (LDPE) films on their electret properties. PTFE films were subjected to wet treatment with three different chemicals: orthophosphoric acid, tetrabutyl titanate and tetraethoxysilane. The technique based on the principles of molecular layer deposition (MLD) method was used to modify the surface of LDPE films with phosphorus trichloride vapors. The surfaces of the films were then corona charged, and the electret charge stability was studied by means of isothermal and thermally stimulated surface potential decay. Both PTFE and LDPE films, after the surface treatment, displayed a considerable enhancement in the charge stability compared to the virgin samples. It is important to note that the enhancement of the charge stability was achieved in the positively charged PTFE films, a result important to practical applications. We attribute this effect of charge stabilization to the formation of new energetically deep traps on the modified surface. Decrease in molecular mobility, due to attachment of new chemical structures to the surface macro molecules, may also contribute to the overall growth of the charge stability.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • G. Kofod
  • H. Stoyanov
  • M. Kollosche
  • S. Risse
  • H. Ragusch
  • Dmitry Rychkov
  • M. Dansachmüller
  • D. McCarthy

Nano-scale Materials Science for Soft Dielectrics: Composites for Dielectric Elastomer Actuators

  • (2010)

DOI: 10.1109/ICSD.2010.5568262

Electro-mechanical transducers based on soft elastomers can be improved by suitable manipulation of dielectric properties, mechanical stiffness and electric breakdown strength. The dielectric constant of an elastomer can be improved by mixing with other components with a higher dielectric constant, and both insulating or conducting filler materials may be employed. We present our results on insulating nanoparticulate TiO 2 with various chemical modifications, which may lead to devices with improved properties. Conducting nanoparticles such as carbon black may lead to percolation-related enhancement, though with strongly detrimental side effects. On the other hand, a “molecular composite” approach, in which the conducting nanoparticles are grafted chemically to the backbone, appears valuable.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • V. Golade
  • Rychkov, A. A.
  • Dmitry Rychkov

Electret Properties of Polymer Films and Fiber Materials Modified by Phosphorus Trichloride

  • (2010)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • M. Dansachmüller
  • H. Ragusch
  • A. Becker
  • G. Kofod

Force Relaxation in Charged Dielectric Elastomer Actuators

  • (2010)

DOI: 10.1109/ICSD.2010.5568252

A new method for the investigation of dielectric elastomer actuators is developed, in which the relaxation of actuation force is observed under constant strain condition in an open-circuit regime. Independent isothermal surface potential decay measurements were employed to study the charge storage properties of the same elastomer materials. The following materials were used for dielectric elastomer actuators fabrication: VHB (adhesive films by 3M) and Poly-styrene-ethylene-butadiene-styrene (SEBS-Dryflex). It is found that actuation force relaxation kinetics is largely dependent on charge storage and transport properties of the actuator's dielectric elastomer material.
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • G. Kofod
  • H. Stoyanov
  • S. Risse
  • M. Kollosche
  • McCarthy, D.N.
  • R. Kraehnert
  • H. Ragusch
  • Dmitry Rychkov

Improvement of Materials for Dielectric Elastomer Actuators Based on Conducting Particle Composites

In: Actuator 10. 12th International Conference on New Actuators & 6th International Exhibition on Smart Actuators and Drive Systems ; 14-16 June 2010, Bremen, Germany (Actuator - International Conference and Exhibition on New Actuators and Drive Systems) pg. 888-891.

Bremen

  • (2010)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Dmitry Rychkov
  • Dergachev, V.F.

Homocharge transport in non-polar polymers with a gas-phase modified surface . (in Russian)

In: Izvestiya RGPU: Scientific Journal vol. 48 pg. 75-82.

  • (2008)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • V. Pak
  • Dmitry Rychkov
  • S. Trifonov
  • Rychkov, A. A.

Electret phenomenon in polymers with chemically modified surface

pg. 17-20.

  • (2008)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Rychkov, A. A.
  • S. Trifonov
  • A. Kuznetsov
  • E. Sosnov
  • Dmitry Rychkov
  • A. Malygin

Influence of Chemical Modification of the Surface of Low-Density Polyethylene on Its Electret Properties

In: Russian Journal of Applied Chemistry vol. 80 pg. 461-465.

  • (2007)

DOI: 10.1134/S1070427207030214

The electret properties of low-density polyethylene with phosphorus-containing surface nanostructures were examined.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Rychkov, A. A.
  • Dmitry Rychkov
  • S. Trifonov

Electret charge stability in film and fibrous polyethylene modified by phosphorus trichloride vapors . (in Russian)

In: Izvestiya RGPU: Scientific Journal vol. 8 pg. 89-97.

  • (2007)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Zeitschriftenartikel

  • Rychkov, A. A.
  • V. Pak
  • A. Kuznetsov
  • Dmitry Rychkov
  • R. Benberya

Phenomenon of electret charge stabilization in polytetraflouroethylene films with chemically modified surface . (in Russian)

In: Izvestiya RGPU: Scientific Journal vol. 7 pg. 137-142.

  • (2007)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • A. Kuznetsov
  • Dmitry Rychkov
  • R. Benberya

Electret phenomenon in polymers with modified surface

pg. 23-27.

  • (2006)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Rychkov, A. A.
  • Dmitry Rychkov
  • S. Trifonov

Electret phenomenon in film and fibrous LDPE modified by phosphorus trichloride vapors

pg. 7-13.

  • (2006)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • A. Kuznetsov
  • Rychkov, A. A.
  • A. Petrova

Energy spectrum of surface states in LDPE films modified with PCl3 vapours

pg. 26.

  • (2006)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Zeitschriftenartikel

  • Rychkov, A. A.
  • Dmitry Rychkov
  • A. Kuznetsov
  • Y. Gerashenko
  • N. Kojevnikova
  • O. Kujelnaya

New electret materials based on polymers with modified surface and melt-blown polymers . (in Russian)

In: Izvestiya RGPU: Scientific Journal vol. 5 pg. 204-219.

  • (2005)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Zeitschriftenartikel

  • Rychkov, A. A.
  • Y. Gorokhovatsky
  • Dmitry Rychkov
  • A. Kuznetsov

Electret phenomenon in non-polar fluoropolymers with phosphorus-containing nanostructures on the surface” Materials Technologies Instruments . (in Russian)

In: Materials Technologies Instruments vol. 10 pg. 74-78.

  • (2005)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • A. Kuznetsov
  • Dmitry Rychkov
  • Rychkov, A. A.

Homocharge stability in low density polyethylene film electrets with surface phosphorus-containing nanostructures

pg. 112-116.

  • (2005)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Buch (Monographie)

  • Rychkov, A. A.
  • Dmitry Rychkov
  • S. Trifonov

Полимерные диэлектрики : учеб. пособие (Polymer dielectrics) . A textbook for Engineering or Physics bachelor/master students

Knijniy Dom Publishing St. Petersburg, Russland

  • (2005)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Rychkov, A. A.
  • Dmitry Rychkov
  • S. Trifonov

Electret state stability in polymers with modified surface . (in Russian)

In: Izvestiya RGPU: Scientific Journal vol. 4 pg. 122-134.

  • (2004)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Rychkov, A. A.
  • Dmitry Rychkov
  • A. Kuznetsov

The stability of polymer electrets with surface nanostructures in severe climatic conditions

pg. 91-94.

  • (2004)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Zeitschriftenartikel

  • Rychkov, A. A.
  • A. Malygin
  • S. Trifonov
  • Dmitry Rychkov

Influence of Chemical Modification of the Surface on the Electret Properties of Polytetrafluoroethylene

In: Russian Journal of Applied Chemistry vol. 77 pg. 276-280.

  • (2004)

DOI: 10.1023/B:RJAC.0000030366.96644.2c

Thermal stability of the electret state of polytetrafluoroethylene films with element oxide structures on the surface was studied. The frequency factor and the activation energies of the newly formed groups of deep centers that capture the electret charge were determined.
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • S. Trifonov
  • A. Malygin
  • Dmitry Rychkov

The nature of electret charge traps in polymers with element-containing nanostructures on the surface

pg. 11-13.

  • (2003)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Rychkov, A. A.
  • Y. Gorokhovatsky
  • Dmitry Rychkov

Method for Determination of Polarization Decay in Polarized Polymer Films

pg. 805-807.

  • (2003)
The novel voltage recovery technique is used for analysis of charge storage and transport in polymer electrets. We have shown that there is an opportunity to discriminate between real charge decay and polarization relaxation. This method enabled us to determine polarization relaxation kinetics in poled P(VDF-HFP) films. It has been shown that time interval of polarization relaxation comprises more than five decades at 290 K. Using appropriate analysis and experimental results we have determined real charge and polarization parameters.
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • V. Boitzov
  • Dmitry Rychkov
  • Rychkov, A. A.

Test techniques for diagnostics of polar partially crystalline polymers

pg. 349-351.

  • (2003)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • Rychkov, A. A.

Excess charge and polarization interaction in electret structures P(VDF-HFP)-Al

pg. 74-76.

  • (2003)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Rychkov, A. A.
  • Dmitry Rychkov
  • Dergachev, V.F.

Fluoropolymers surface modification in technologies of thermally stable electret production

pg. 44-48.

  • (2003)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Rychkov, A. A.
  • Dmitry Rychkov

Electret state formation and relaxation in polymers

pg. 7-11.

  • (2003)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Zeitschriftenartikel

  • V. Boitzov
  • Dmitry Rychkov

Polymeric electrets in innovative technologies . (in Russian)

In: Izvestiya RGPU: Scientific Journal vol. 2 pg. 118-133.

  • (2002)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Y. Gorokhovatsky
  • V. Boitzov
  • Dmitry Rychkov

Thermal stability of polarization structures in corona-charged P(VDF-HFP) copolymers films

pg. 134-137.

  • (2002)

DOI: 10.1109/ISE.2002.1042962

The trapping of charge carriers in localized states on the surface of /spl beta/-crystallites in P(VDF-HFP) films has been studied by means of a novel voltage recovery technique. It has been found that a phase transition from /spl alpha/-non polar to the /spl delta/-polar configuration takes place under the process of charge injection. Using experimental measurements and appropriate analysis, we determine the energy distribution of the traps located near the /spl beta/-crystallites surfaces, and estimate the spatial dimensions of the molecular dipoles to be about 11-12 nm. The industrial application method was suggested in order to improve the thermal stability of charge and polarization in corona-charged copolymer films.
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov

The effect of corona discharge treatment on thermal stability of copolymer of vinylidenefluoride with hexafluoropropylene film electrets

pg. 212-214.

  • (2002)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Y. Gorokhovatsky
  • Dmitry Rychkov
  • Semikhin Y.A.

Determination of frequency factor and activation energy distributions in copolymer of vinylidenefluoride with hexafluoropropylene

pg. 64-66.

  • (2002)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • V. Boitzov
  • Dmitry Rychkov

Technological features of industrial electrets and electret microphones production

pg. 309-311.

  • (2002)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • V. Boitzov
  • Dmitry Rychkov

Electret phenomenon in copolymer of vinylidenefluoride with hexafluoropropylene

pg. 86-88.

  • (2001)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Zeitschriftenartikel

  • V. Boitzov
  • Dmitry Rychkov

Novel polymeric materials for electret and piezoelectric transducers . (in Russian)

In: Izvestiya RGPU: Scientific Journal vol. 12 pg. 46-48.

  • (2001)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov
  • V. Boitzov

Voltage recovery kinetics in electret structures (P(VDF-HFP)) after short-circuiting

pg. 83-85.

  • (2001)
  • TSZ Weißenburg
  • Maschinenbau und Mechatronik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Dmitry Rychkov

Measuring complex for investigation of electret state in polar polymers

pg. 89-90.

  • (2000)
  • Maschinenbau und Mechatronik
  • TSZ Weißenburg
  • NACHHALTIG

Vita

Studium

1994 – 1999 Studium der Physik an der Russische Staatliche Pädagogische A.I. Herzen-Universität, Institut für Allgemeine und Experimentalphysik, St-Petersburg, Russland. Abschluss als Physiklehrer und Englischlehrer. Beginn der Promotion im Fach Physik an der Herzen-Universität. 2002 Erfolgreicher Abschluss der Promotion auf dem Gebiet der Physik der kondensierten Materie.

Berufliche Arbeit

9.2002 – 8.2004 Assistant professor (vergleichbar einer Juniorprofessur) am Institut für Allgemeine und Experimentalphysik an der Herzen-Universität, St-Petersburg, Russland. 9.2004 – 3.2009 Associate professor (vergleichbar einer W2-Professur) am Institut für Allgemeine und Experimentalphysik an der Herzen-Universität, St-Petersburg, Russland. 4.2009 – 8.2019 Wissenschaftlicher Mitarbeiter / Leitender Wissenschaftler in der Arbeitsgruppe Angewandte Physik kondensierter Materie an der Universität Potsdam 9.2019 – heute Professor, Nachhaltige Kunststofftechnik. Wissenschaftlicher Leiter Technologie- und Studienzentrum Weißenburg. Technische Hochschule Deggendorf


Sonstiges

Veröffentlichungen

Mehr als 100 Publikationen, inklusive 2 Lehrbücher und 2 Buch-Kapitel: https://zaf.th-deg.de/public/publication/all?needle=%5BRychkov%5D+%5BDmitry%5D&embedded=false http://scholar.google.de/citations?user=kKuGJjoAAAAJ&hl=en&oi=ao http://www.researcherid.com/rid/H-2940-2012 https://www.researchgate.net/profile/Dmitry_Rychkov/

Expertentätigkeit

Associate Editor: IEEE Transactions on Dielectrics and Electrical Insulation Reviewer: Journal of Applied Physics, Applied Physics A, Appled Physics Letters, IOP Journal of Physics D, Journal Electrostatics, Polymer International, Smart Materials and Structures, IEEE Transactions on Dielectrics and Electrical Insulation, IEEE Sensors, IEEE Electrical Insulation Magazine.

Mitgliedschaften

IEEE (Institute of Electrical and Electronics Engineers) SPE (Society of Plastics Engineers) EuroEAP (European Society for Electromechanically Active Polymer Transducers & Artificial Muscles)