Special Issue "Polymeric Microsystems"
A special issue of Micromachines (ISSN 2072-666X).
Deadline for manuscript submissions: closed (25 May 2016)
Prof. Dr. Andreas Richter
Polymeric Microsystems, Technische Universität Dresden, Dresden 01062, Germany
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Interests: microsystems; system integration; microfluidics; chemical sensors and sensor systems; imaging systems; energy harvesting; actuator systems; intrinsically active polymers; chemical information processing
Polymeric microsystems are much more than a cheap alternative to common silicon-based microsystems. In the fields of optics, display technologies, multifunctional electronics, sensors, actuators, energy harvesting, and microfluidics, they offer features which significantly exceed the possibilities of silicon-based systems.
This Special Issue highlights the potential of polymeric microsystems in various fields of applications. It includes:
- (i) fabrication technologies for polymeric microsystems,
- (ii) concepts of active polymeric components, modules and complete systems,
- (iii) modelling and simulation of polymeric material behaviors in components and chips, as well as
- (iv) exemplary applications.
Of particular interest are, on the one hand, intrinsically active polymers, such as piezo polymers, shape memory polymers, stimuli-responsive hydrogels and conductive polymers, and, on the other hand, electroactive polymers, such as dielectric elastomers.
Prof. Dr. Andreas Richter
Manuscript Submission Information
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- technologies for polymeric microsystems
- intrinsically active polymers
- stimuli responsive hydrogels
- shape memory polymers
- piezo polymers
- conductive polymers
- electroactive polymers
- sensors, actuators
- optical modulators
- multi modal modulators
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Ionoprinted Multi-Responsive Hydrogel Bilayers
Authors: Daniel Morales, Igor Podolsky, Russell Mailen, Michael D. Dickey,* Orlin D. Velev*
Abstract: There has been increasing interest and progress in engineering soft, shape-transforming materials which can mimic the sensing and response mechanisms found in nature. Hydrogels have become a model material for exploring stimuli-responsive behaviors in solvents. This is due to their ability to incur large volume changes in response to a multitude of external stimuli. The mechanical properties of hydrogels can be modulated by functionalizing the gel with gradient structures to achieve controlled actuation in response to the external environment. These gradient structures most often are introduced by designing bilayer gel systems, particle or interpenetrating polymer hydrogel composites and regions of varying crosslink density both through the gel depth or in-plane. The differential swelling along or across the gel systems leads to a buildup of internal stresses resulting in reversible, 3D shape transformations. Such biocompatible, adaptive materials are being applied to a broad range of applications including biomaterials, soft robotics, drug delivery, microfluidics and sensing. Several challenges need to be addressed to enable their ubiquitous use as functional, soft devices such as improving their slow response times and weak mechanical properties. Furthermore, previously explored actuation mechanisms generally result in an “on” or “off” state, determined by the magnitude of the applied stimulus. Our desire is to begin to develop synthetic systems which reconfigure into 3D structures that are uniquely and proportionally responsive to a specific set of external conditions, towards developing “intelligent” soft materials. Previous groups developed multi-responsive gels by incorporating separate networks sensitive to different stimuli into one gel composite, incorporating bi-axial stresses with crosslinking gradients or by incorporating modular gel building blocks into 3D geometries. These gel systems have large response times (~ hrs) and require photolithographic processing techniques. Here, we have developed multi-responsive gel bilayer sheets by combining thermoresponsive poly (N-isopropylacrylamide) (pNIPAAm) with superabsorbent sodium poly(sodium acrylate) (pNaAc) gels. The actuators can be created rapidly and are functionalized with reversible, locally crosslinked regions. The bending can be tuned to reverse direction isothermally by changing the solvent quality or by changing the temperature at a fixed concentration. We achieve this by making use of the LCST (lower critical solution temperature) and UCST (upper critical solution temperature) transitions that pNIPAAm can incur in the presence of the appropriate cononsolvent. The bilayers can be programmed to invert their bending axis by utilizing an ionic crosslinking technique, ionoprinting, developed previously in our group. Ionoprinting renders the bilayer sheets reprogrammable due to the ability to erase the ionic crosslinks. We demonstrate the use of these simple fabrication techniques to produce gel actuators which can transform into unique shapes with a fast response time.
Title: 3D Printed Microfluidic E-Tongue in Soil Sample Analysis
Author: Toni Riul
Abstract: 3D printing is transforming ideas in numerous applications, driving new directions in microfluidics. It is an emerging technology offering a fast, cost-effective way to produce complex structures with high resolution to assembly integrated devices. The development of devices with improved features can be accelerated by combining forefront tools for rapid prototyping and simplification of the fabrication process. Here, the layer-by-layer technique was combined with a 3D printed microfluidic platform as a new strategy to form an electronic tongue system. Transparent microchannels made with polylactic acid (PLA), a cheap alternative material to overcome the PDMS realms, were built in a home-made fused deposition modeling (FDM) 3D printer. Interdigitated electrodes could be easily inserted and sealed in one-step process using the FDM technology to form individual sensing units. As a proof-of-concept, Principal Component Analysis was used to correlate soil samples analysed by a 3D-printed e-tongue device, paving the way for future developments in the agro-food sector.
Title: Microfluidic Circular Channel Helices
Author: Georgette Salieb-Beugelaar
Title: Flexible Production Systems for Diagnostic Cartridges
Authors: Dominique Kosse, Daniel Baumann and Felix von Stetten