Ali Maziz
Linköping University
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Publication
Featured researches published by Ali Maziz.
Smart Materials and Structures | 2013
Nicolas Festin; Ali Maziz; Cédric Plesse; Dominique Teyssié; Claude Chevrot; Frédéric Vidal
Interpenetrating polymer networks (IPNs) based on nitrile butadiene rubber (NBR) as first component and poly(ethylene oxide) (PEO) as second component were synthesized and used as a solid polymer electrolyte film in the design of a mechanically robust conducting IPN actuator. IPN mechanical properties and morphologies were mainly investigated by dynamic mechanical analysis and transmission electron microscopy. For 1-ethyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)-imide (EMITFSI) swollen IPNs, conductivity values are close to 1 × 10−3 S cm−1 at 25 ° C. Conducting IPN actuators have been synthesized by chemical polymerization of 3,4-ethylenedioxythiophene (EDOT) within the PEO/NBR IPN. A pseudo-trilayer configuration has been obtained with PEO/NBR IPN sandwiched between two interpenetrated PEDOT electrodes. The robust conducting IPN actuators showed a free strain of 2.4% and a blocking force of 30 mN for a low applied potential of ±2 V.
Scientific Reports | 2015
Andres Punning; Kwang J. Kim; Viljar Palmre; Frédéric Vidal; Cédric Plesse; Nicolas Festin; Ali Maziz; Kinji Asaka; Takushi Sugino; Gursel Alici; Geoffrey M. Spinks; Gordon G. Wallace; Indrek Must; Inga Põldsalu; Veiko Vunder; Rauno Temmer; Karl Kruusamäe; Janno Torop; Friedrich Kaasik; Pille Rinne; Urmas Johanson; Anna Liisa Peikolainen; Tarmo Tamm; Alvo Aabloo
A large-scale effort was carried out to test the performance of seven types of ionic electroactive polymer (IEAP) actuators in space-hazardous environmental factors in laboratory conditions. The results substantiate that the IEAP materials are tolerant to long-term freezing and vacuum environments as well as ionizing Gamma-, X-ray, and UV radiation at the levels corresponding to low Earth orbit (LEO) conditions. The main aim of this material behaviour investigation is to understand and predict device service time for prolonged exposure to space environment.
Science Advances | 2017
Ali Maziz; Alessandro Concas; Alexandre Khaldi; Jonas Stålhand; Nils-Krister Persson; Edwin Jager
Textile artificial muscles were developed using weaving to increase the force and knitting to amplify the strain. A need exists for artificial muscles that are silent, soft, and compliant, with performance characteristics similar to those of skeletal muscle, enabling natural interaction of assistive devices with humans. By combining one of humankind’s oldest technologies, textile processing, with electroactive polymers, we demonstrate here the feasibility of wearable, soft artificial muscles made by weaving and knitting, with tunable force and strain. These textile actuators were produced from cellulose yarns assembled into fabrics and coated with conducting polymers using a metal-free deposition. To increase the output force, we assembled yarns in parallel by weaving. The force scaled linearly with the number of yarns in the woven fabric. To amplify the strain, we knitted a stretchable fabric, exhibiting a 53-fold increase in strain. In addition, the textile construction added mechanical stability to the actuators. Textile processing permits scalable and rational production of wearable artificial muscles, and enables novel ways to design assistive devices.
Advanced Materials | 2016
Kunli Xiong; Gustav Emilsson; Ali Maziz; Xinxin Yang; Lei Shao; Edwin Jager; Andreas B. Dahlin
A flexible electronic paper in full color is realized by plasmonic metasurfaces with conjugated polymers. An ultrathin large-area electrochromic material is presented which provides high polarization-independent reflection, strong contrast, fast response time, and long-term stability. This technology opens up for new electronic readers and posters with ultralow power consumption.
ACS Applied Materials & Interfaces | 2016
Ali Maziz; Cédric Plesse; C. Soyer; E. Cattan; Frédéric Vidal
Recent progress in the field of microsystems on flexible substrates raises the need for alternatives to the stiffness of classical actuation technologies. This paper reports a top-down process to microfabricate soft conducting polymer actuators on substrates on which they ultimately operate. The bending microactuators were fabricated by sequentially stacking layers using a layer polymerization by layer polymerization of conducting polymer electrodes and a solid polymer electrolyte. Standalone microbeams thinner than 10 μm were fabricated on SU-8 substrates associated with a bottom gold electrical contact. The operation of microactuators was demonstrated in air and at low voltage (±4 V).
Proceedings of SPIE | 2015
Ali Maziz; Alexandre Khaldi; Nils-Krister Persson; Edwin Jager
There is a growing demand for human-friendly robots that can interact and work closely with humans. Such robots need to be compliant, lightweight and equipped with silent and soft actuators. Electroactive polymers such as conducting polymers (CPs) are “smart” materials that deform in response to electrical simulation and are often addressed as artificial muscles due to their functional similarity with natural muscles. They offer unique possibilities and are perfect candidates for such actuators since they are lightweight, silent, and driven at low voltages. Most CP actuators are fabricated using electrochemical oxidative synthesis. We have developed new CP based fibres employing both vapour phase and liquid phase electrochemical synthesis. We will present the fabrication and characterisation of these fibres as well as their performance as linear actuators.
Proceedings of SPIE | 2015
Alexandre Khaldi; Ali Maziz; Gursel Alici; Geoffrey M. Spinks; Edwin Jager
Within the areas of cell biology, biomedicine and minimal invasive surgery, there is a need for soft, flexible and dextrous biocompatible manipulators for handling biological objects, such as single cells and tissues. Present day technologies are based on simple suction using micropipettes for grasping objects. The micropipettes lack the possibility of accurate force control, nor are they soft and compliant and may thus cause damage to the cells or tissue. Other micromanipulators use conventional electric motors however the further miniaturization of electrical motors and their associated gear boxes and/or push/pull wires has reached its limits. Therefore there is an urgent need for new technologies for micromanipulation of soft biological matter. We are developing soft, flexible micromanipulators such as micro- tweezers for the handling and manipulation of biological species including cells and surgical tools for minimal invasive surgery. Our aim is to produce tools with minimal dimensions of 100 μm to 1 mm in size, which is 1-2 orders of magnitude smaller than existing technology. We present newly developed patterning and microfabrication methods for polymer microactuators as well as the latest results to integrate these microactuators into easy to use manipulation tools. The outcomes of this study contribute to the realisation of low-foot print devices articulated with electroactive polymer actuators for which the physical interface with the power source has been a significant challenge limiting their application. Here, we present a new bottom-up microfabrication process. We show for the first time that such a bottom-up fabricated actuator performs a movement in air. This is a significant step towards widening the application areas of the soft microactuators.
Proceedings of SPIE | 2016
Alexandre Khaldi; Daniel Falk; Ali Maziz; Edwin Jager
We are developing soft, flexible micromanipulators such as micro- tweezers for the handling and manipulation of biological species including cells and surgical tools for minimal invasive surgery. Our aim is to produce tools with minimal dimensions of 100 μm to 1 mm in size, which is 1-2 orders of magnitude smaller than existing technology. However, the displacement of the current developed micromanipulator remains limited due to the low ionic conductivity of the materials. Here, we present developed methods for the fabrication of conjugated polymer trilayer structure which exhibit potential to high stretchability/flexibility as well as a good adhesion between the three different layers. The outcomes of this study contribute to the realisation of low-foot print devices articulated with electroactive polymer actuators for which the physical interface with the power source has been a significant challenge limiting their application. Here, we present a new flexible trilayer structure, which will allow the fabrication of metal-free soft microactuators.
international conference on advanced intelligent mechatronics | 2014
Alexandre Khaldi; Ali Maziz; Cédric Plesse; Caroline Soyer; Dominique Teyssié; Frédéric Vidal; Eric Cattan
Interpenetrating polymer networks, as biomimetic actuators, can become successful actuators in the field of microsystems providing they are compatible with micro-technologies. In this paper, we report a novel material synthesized from poly(3,4-ethylenedioxythiophene) and polyethylene oxide/nitrile butadiene rubber. The electroactive material is built as a pseudo trilayer and its lateral sides have been patterned using dry plasma etching at high etch rates and with vertical sidewalls. A chemical process and a “self-degradation” are proposed to explain such high etching rates. Preliminary actuation results show that micro-beams can move with very large displacements. These micro-sized actuators are potential candidates in numerous applications, including micro-switches, micro-valves, micro-optical instrumentation and micro-robotics.
ACS Applied Materials & Interfaces | 2018
Alexandre Khaldi; Daniel Falk; Katarina Bengtsson; Ali Maziz; Daniel Filippini; Nathaniel D. Robinson; Edwin Jager
There is a need for soft actuators in various biomedical applications 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 (CP) 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 CP 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 microcontact printing, followed by vapor-phase polymerization of the CP. Submillimeter 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 CP layers in many types of complex three-dimensional structures.