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Publications (10 of 112) Show all publications
Gomez-Carretero, S., Libberton, B., Svennersten, K., Persson, K. M., Jager, E., Berggren, M., . . . Richter-Dahlfors, A. (2018). Correction: Redox-active conducting polymers modulate Salmonella biofilm formation by controlling availability of electron acceptors (vol 3, article number 19, 2017). npj Biofilms and Microbiomes, 4(1), Article ID 19.
Open this publication in new window or tab >>Correction: Redox-active conducting polymers modulate Salmonella biofilm formation by controlling availability of electron acceptors (vol 3, article number 19, 2017)
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2018 (English)In: npj Biofilms and Microbiomes, ISSN 2055-5008, Vol. 4, no 1, article id 19Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Nature Publishing Group, 2018
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-151743 (URN)10.1038/s41522-018-0061-6 (DOI)000452255400001 ()30109118 (PubMedID)2-s2.0-85051180846 (Scopus ID)
Note

This article corrects the research article with the DOI: 10.1038/s41522-017-0027-0. The research article is registered in DiVA: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-151745

Available from: 2018-10-04 Created: 2018-10-04 Last updated: 2018-12-20Bibliographically approved
Zhong, Y., Lundemo, S. & Jager, E. (2018). Development of polypyrrole based solid state on-chip microactuators using photolithography. Smart materials and structures (Print), 27(7), Article ID 074006.
Open this publication in new window or tab >>Development of polypyrrole based solid state on-chip microactuators using photolithography
2018 (English)In: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 27, no 7, article id 074006Article in journal (Refereed) Published
Abstract [en]

There is a need for soft microactuators, especially for biomedical applications. We have developed a microfabrication process to create such soft, on-chip polymer-based microactuators that can operate in air. The on-chip microactuators were fabricated using standard photolithographic techniques and wet etching, combined with special designed process to micropattern the electroactive polymer polypyrrole that drives the microactuators. By immobilizing a UV-patternable gel containing a liquid electrolyte on top of the electroactive polypyrrole layer, actuation in air was achieved although with reduced movement. Further optimization of the processing is currently on-going. The result shows the possibility to batch fabricate complex microsystems such as microrobotics and micromanipulators based on these solid state on-chip microactuators using microfabrication methods including standard photolithographic processes.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2018
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-147342 (URN)10.1088/1361-665X/aabe42 (DOI)000434378700006 ()
Note

Funding agencies: European Union [641822]; SSF; VINNOVA (OBOE-Center for Organic Bioelectronics); Swedish Research Council [VR-2014-3079]

Available from: 2018-04-19 Created: 2018-04-19 Last updated: 2018-08-22Bibliographically approved
Zhong, Y., Nguyen, G., Plesse, C., Vidal, F. & Jager, E. (2018). Flexible gel electrolytes with reactive surfaces for soft electrochemical systems. In: : . Paper presented at MACRO 18 World Polymer Congress, July 1-5, 2018,Cairns Convention Centre, Australia..
Open this publication in new window or tab >>Flexible gel electrolytes with reactive surfaces for soft electrochemical systems
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2018 (English)Conference paper, Oral presentation only (Other academic)
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:liu:diva-151754 (URN)
Conference
MACRO 18 World Polymer Congress, July 1-5, 2018,Cairns Convention Centre, Australia.
Available from: 2018-10-04 Created: 2018-10-04 Last updated: 2018-10-30
Zhong, Y., Nguyen, G. T. M., Nesse, C., Vida, F. & Jager, E. (2018). Highly Conductive, Photolithographically Patternable Ionogels for Flexible and Stretchable Electrochemical Devices. ACS Applied Materials and Interfaces, 10(25), 21601-21611
Open this publication in new window or tab >>Highly Conductive, Photolithographically Patternable Ionogels for Flexible and Stretchable Electrochemical Devices
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 25, p. 21601-21611Article in journal (Refereed) Published
Abstract [en]

An ionic conducting membrane is an essential part in various electrochemical devices including ionic actuators. To miniaturize these devices, micropatterns of ionic conducting membrane are desired. Here, we present a novel type of ionogel that can be patterned using standard photolithography and soft imprinting lithography. The ionogel is prepared in situ by UV-initiated free-radical polymerization of thiol acrylate precursors in the presence of ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The resultant ionogel is very flexible with a low Youngs modulus (as low as 0.23 MPa) and shows a very high ionic conductivity (up to 2.4 X 10(-3) S/cm with 75 wt % ionic liquid incorporated) and has a reactive surface due to the excess thiol groups. Micropatterns of ionogel are obtained by using the thiol acrylate ionogel solution as an ionic conducting photoresist with standard photolithography. Water, a solvent immiscible with ionic liquid, is used as the photoresist developer to avoid complete removal of ionic liquid from thin micropatterns of the ionogel. By taking advantage of the reactive surface of ionogels and the photopatternability, ionogels with complex three-dimensional microstructure are developed. The surface of the ionogels can also be easily patterned using UV-assisted soft imprinting lithography. This new type of ionogels may open up for building high-performance flexible electrochemical microdevices.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
Keywords
micropatterning; ionogel; reactive surface; thiol acrylate photochemistry; electrochemical devices; photolithography
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:liu:diva-149873 (URN)10.1021/acsami.8b03537 (DOI)000437811400064 ()29856596 (PubMedID)
Note

Funding Agencies|European Unions Horizon 2020 research and innovation program under the Marie Sklodowska Curie grant [641822]; Swedish Research Council [VR-2014-3079]

Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-22
Martinez, J. G., Richter, K., Persson, N.-K. & Jager, E. (2018). Investigation of electrically conducting yarns for use in textile actuators. Smart materials and structures (Print), 27(7), Article ID 074004.
Open this publication in new window or tab >>Investigation of electrically conducting yarns for use in textile actuators
2018 (English)In: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 27, no 7, article id 074004Article in journal (Refereed) Published
Abstract [en]

Textile actuators are an emerging technology to develop biomimetic actuators with synergetic actuation. They are composed of a passive fabric coated with an electroactive polymer providing with mechanical motion. Here we used different conducting yarns (polyamide + carbon, silicon + carbon, polyamide + silver coated, cellulose + carbon, polyester + 2 x INOX 50µm, polyester + 2 x Cu/Sn and polyester + gold coated) to develop such textile actuators. It was possible to coat them through direct electrochemical methods, which should provide with an easier and more cost-effective fabrication process. The conductivity and the electrochemical properties of the yarns were sufficient to allow the electropolymerization of the conducting polymer polypyrrole on the yarns. The electropolymerization was carried out and both the linear and angular the actuation of the yarns was investigated. These yarns may be incorporated into textile actuators for assistive prosthetic devices easier and cheaper to get and at the same time with good mechanical performance are envisaged.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2018
National Category
Textile, Rubber and Polymeric Materials Polymer Chemistry Materials Chemistry Polymer Technologies
Identifiers
urn:nbn:se:liu:diva-146221 (URN)10.1088/1361-665X/aabab5 (DOI)000434378700004 ()
Note

Funding agencies: Carl Tryggers Stifelsen [CTS16:207]; Swedish Research Council [VR-2014-3079]; Erling-Persson Family Foundation [2017-10-09]; Promobilia Foundation [F17603]

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-10-12Bibliographically approved
Khaldi, A., Falk, D., Bengtsson, K., Maziz, A., Filippini, D., Robinson, N. D. & Jager, E. W. H. (2018). Patterning highly conducting conjugated polymer electrodes for soft and flexible microelectrochemical devices. ACS Applied Materials and Interfaces, 10(17), 14978-14985
Open this publication in new window or tab >>Patterning highly conducting conjugated polymer electrodes for soft and flexible microelectrochemical devices
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 17, p. 14978-14985Article in journal (Refereed) Published
Abstract [en]

There is a need for soft actuators in various biomedical applications in order to manipulate delicate objects such as cells and tissues. Soft actuators are able to adapt to any shape and limit the stress applied to delicate objects. Conjugated polymer actuators, especially in the so-called trilayer configuration, are interesting candidates for driving such micromanipulators. However, challenges involved in patterning the electrodes in a trilayer with individual contact have prevented further development of soft micromanipulators based on conjugated polymer actuators. To allow such patterning, two printing-based patterning techniques have been developed. First an oxidant layer is printed using either syringe-based printing or micro-contact printing, followed by vapor phase polymerization of the conjugated polymer. Sub-millimeter patterns with electronic conductivities of 800 Scm-1 are obtained. Next, laser ablation is used to cleanly cut the final device structures including the printed patterns, resulting in fingers with individually controllable digits and miniaturized hands. The methods presented in this paper will enable integration of patterned electrically active conjugated polymer layers in many types of complex 3-D structures.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
Vapor phase polymerization, Printing, soft Lithography, Conjugated Polymers actuators, patterning, microfabrication
National Category
Chemical Sciences
Identifiers
urn:nbn:se:liu:diva-146132 (URN)10.1021/acsami.8b01059 (DOI)000431723400081 ()29557639 (PubMedID)
Note

Funding agencies:This study was financially supported by Linköping University, COST Action MP1003 ESNAM (European Scientific Network for Artificial Muscles), the Swedish Research Council (VR – 2010-6672, 2014-3079, 2015-03298), the Knut & Alice Wallenberg Stiftelse (LiU-2010-00318 & LiU-2012- 01361), and the EU FP7 Marie Curie action IEF (625923 POLYACT)

Available from: 2018-03-28 Created: 2018-03-28 Last updated: 2018-05-30Bibliographically approved
Jager, E., Ladegaard-Skov, A., Otero, T. & Jean-Mistral, C. (2018). Progress in electromechanically active polymers: selected papers from EuroEAP 2017. Smart materials and structures (Print), 27(7), Article ID 070201.
Open this publication in new window or tab >>Progress in electromechanically active polymers: selected papers from EuroEAP 2017
2018 (English)In: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 27, no 7, article id 070201Article in journal, Editorial material (Other academic) Published
Abstract [en]

n/a

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2018
Identifiers
urn:nbn:se:liu:diva-148622 (URN)10.1088/1361-665X/aac300 (DOI)000434378300001 ()070201 (PubMedID)
Available from: 2018-06-15 Created: 2018-06-15 Last updated: 2018-06-28
Gomez-Carretero, S., Libberton, B., Svennersten, K., Persson, K. M., Jager, E., Berggren, M., . . . Richter-Dahlfors, A. (2018). Redox-active conducting polymers modulate Salmonella biofilm formation by controlling availability of electron acceptors (vol 3, article number 19, 2017). npj Biofilms and Microbiomes, 3, Article ID 19.
Open this publication in new window or tab >>Redox-active conducting polymers modulate Salmonella biofilm formation by controlling availability of electron acceptors (vol 3, article number 19, 2017)
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2018 (English)In: npj Biofilms and Microbiomes, ISSN 2055-5008, Vol. 3, article id 19Article in journal (Refereed) Published
Abstract [en]

Biofouling is a major problem caused by bacteria colonizing abiotic surfaces, such as medical devices. Biofilms are formed as the bacterial metabolism adapts to an attached growth state. We studied whether bacterial metabolism, hence biofilm formation, can be modulated in electrochemically active surfaces using the conducting conjugated polymer poly(3,4-ethylenedioxythiophene) (PEDOT). We fabricated composites of PEDOT doped with either heparin, dodecyl benzene sulfonate or chloride, and identified the fabrication parameters so that the electrochemical redox state is the main distinct factor influencing biofilm growth. PEDOT surfaces fitted into a custom-designed culturing device allowed for redox switching in Salmonella cultures, leading to oxidized or reduced electrodes. Similarly large biofilm growth was found on the oxidized anodes and on conventional polyester. In contrast, biofilm was significantly decreased (52-58%) on the reduced cathodes. Quantification of electrochromism in unswitched conducting polymer surfaces revealed a bacteria-driven electrochemical reduction of PEDOT. As a result, unswitched PEDOT acquired an analogous electrochemical state to the externally reduced cathode, explaining the similarly decreased biofilm growth on reduced cathodes and unswitched surfaces. Collectively, our findings reveal two opposing effects affecting biofilm formation. While the oxidized PEDOT anode constitutes a renewable electron sink that promotes biofilm growth, reduction of PEDOT by a power source or by bacteria largely suppresses biofilm formation. Modulating bacterial metabolism using the redox state of electroactive surfaces constitutes an unexplored method with applications spanning from antifouling coatings and microbial fuel cells to the study of the role of bacterial respiration during infection.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-151745 (URN)10.1038/s41522-017-0027-0 (DOI)000412923600001 ()28883986 (PubMedID)
Note

An author correction to this article was published with the DOI: 10.1038/s41522-018-0061-6 and is registered in DiVA: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-151743

Available from: 2018-10-04 Created: 2018-10-04 Last updated: 2018-12-20
Zhong, Y., Nguyen, G., Plesse, C., Vidal, F. & Jager, E. (2018). Tailorable polymer gel electrolytes with reactive surfaces from thiol acrylate Michael reaction for ionic actuator. In: : . Paper presented at 8th international conference on Electromechanically Active Polymer (EAP) transducers & artificial muscles, June 5-6, 2018, Lyon, France.
Open this publication in new window or tab >>Tailorable polymer gel electrolytes with reactive surfaces from thiol acrylate Michael reaction for ionic actuator
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2018 (English)Conference paper, Oral presentation only (Other academic)
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:liu:diva-151752 (URN)
Conference
8th international conference on Electromechanically Active Polymer (EAP) transducers & artificial muscles, June 5-6, 2018, Lyon, France
Available from: 2018-10-04 Created: 2018-10-04 Last updated: 2018-10-30
Guan, N. N., Sharma, N., Hallén‐Grufman, K., Jager, E. W. H. & Svennersten, K. (2018). The role of ATP signalling in response to mechanical stimulation studied in T24 cells using new microphysiological tools. Journal of Cellular and Molecular Medicine (Print), 22(4), 2319-2328
Open this publication in new window or tab >>The role of ATP signalling in response to mechanical stimulation studied in T24 cells using new microphysiological tools
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2018 (English)In: Journal of Cellular and Molecular Medicine (Print), ISSN 1582-1838, E-ISSN 1582-4934, Vol. 22, no 4, p. 2319-2328Article in journal (Refereed) Published
Abstract [en]

The capacity to store urine and initiate voiding is a valued characteristic of the human urinary bladder. To maintain this feature, it is necessary that the bladder can sense when it is full and when it is time to void. The bladder has a specialized epithelium called urothelium that is believed to be important for its sensory function. It has been suggested that autocrine ATP signalling contributes to this sensory function of the urothelium. There is well‐established evidence that ATP is released via vesicular exocytosis as well as by pannexin hemichannels upon mechanical stimulation. However, there are still many details that need elucidation and therefore there is a need for the development of new tools to further explore this fascinating field. In this work, we use new microphysiological systems to study mechanostimulation at a cellular level: a mechanostimulation microchip and a silicone‐based cell stretcher. Using these tools, we show that ATP is released upon cell stretching and that extracellular ATP contributes to a major part of Ca2+ signalling induced by stretching in T24 cells. These results contribute to the increasing body of evidence for ATP signalling as an important component for the sensory function of urothelial cells. This encourages the development of drugs targeting P2 receptors to relieve suffering from overactive bladder disorder and incontinence.

Place, publisher, year, edition, pages
Wiley, 2018
Keywords
ATP, Ca2+ signalling, mechanostimulation, microphysiological systems, organ on chip, P2X, P2Y
National Category
Cell and Molecular Biology Cell Biology Neurosciences Immunology Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
Identifiers
urn:nbn:se:liu:diva-147345 (URN)10.1111/jcmm.13520 (DOI)000428418200026 ()
Available from: 2018-04-19 Created: 2018-04-19 Last updated: 2018-05-17Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2071-7768

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