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https://www.readbyqxmd.com/read/28195075/stretchable-array-of-metal-nanodisks-on-a-3d-sinusoidal-wavy-elastomeric-substrate-for-frequency-tunable-plasmonics
#1
Di Feng, Hui Zhang, Siyi Xu, Limei Tian, Ningfang Song
Metal nanostructures integrated with soft, elastomeric substrates provide an unusual platform with capabilities in plasmonic frequency tuning of mechanical strain. In this paper, we have prepared a tunable optical device, dense arrays of plasmonic nanodisks on a low-modulus, and high-elongation elastomeric substrate with a three-dimensional (3D) sinusoidal wavy, and their optical characteristics have been measured and analyzed in detail. Since surface plasmon is located and propagates along metal surfaces with sub-wavelength structures, and those dispersive properties are determined by the coupling strength between the individual structures, in this study, a 3D sinusoidal curve elastomeric substrate is used to mechanically control the inter-nanodisk spacing by applying straining and creating a frequency tunable plasmonic device...
February 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28174366/radiofrequency-glow-discharge-as-a-mode-of-disinfection-for-elastomeric-impression-materials
#2
Susan Mathew, Mathew M Alani, K N Velayudhan Nair, Sayij Haridas, P B Reba, Sherin A Thomas
INTRODUCTION: Prosthodontic practice involves procedures in which impressions of the maxillary and mandibular arches are mandatory. Cross infection is one of the major problems that can occur in regular dental practice. Every dentist should take utmost care to prevent cross infection as oral cavity is the source of variety of microorganisms which can often cause diseases that can be fatal. Although precautions, such as wearing of gloves and mask, sterilization of instruments are given importance, the need for disinfection of impressions is often neglected...
February 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28155936/highly-transparent-agnw-pdms-stretchable-electrodes-for-elastomeric-electrochromic-devices
#3
Huan-Shen Liu, Bo-Cheng Pan, Guey-Sheng Liou
Stretchable conductors based on silver nanowires (AgNWs) and polydimethylsiloxane (PDMS) have been studied extensively for many years. However, it is still difficult to achieve high transparency with low resistance due to the low attractive force between AgNWs and PDMS. In this paper, we report an effective method to transfer AgNWs into PDMS by using substrates which have a hydrophobic surface, and successfully prepared stretchable AgNW/PDMS electrodes having high transparency and low sheet resistance at the same time...
February 3, 2017: Nanoscale
https://www.readbyqxmd.com/read/28150829/one-step-micromolding-of-complex-3d-microchambers-for-single-cell-analysis
#4
Hiroaki Suzuki, Kenta Mitsuno, Katsuyuki Shiroguchi, Mamiko Tsugane, Taiji Okano, Tetsuji Dohi, Tomoaki Tsuji
Herein we examined the extent of replicability of the PDMS microchamber device transferred from the master mold with complex 3D structures fabricated via micro stereolithography. Due to the elastomeric properties of PDMS, the reversely tapered micromold, with the diameter ratio of ∼5 from the largest to the narrowest part, was precisely transferred without breaking. We obtained the mathematical model to estimate the stress exerted on the mold during the demolding process. Finally, we tested the applicability of this unusual microchamber for single-cell trapping and an enzyme assay...
February 2, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28026109/soft-elastomers-with-ionic-liquid-filled-cavities-as-strain-isolating-substrates-for-wearable-electronics
#5
Yinji Ma, Matt Pharr, Liang Wang, Jeonghyun Kim, Yuhao Liu, Yeguang Xue, Rui Ning, Xiufeng Wang, Ha Uk Chung, Xue Feng, John A Rogers, Yonggang Huang
Managing the mechanical mismatch between hard semiconductor components and soft biological tissues represents a key challenge in the development of advanced forms of wearable electronic devices. An ultralow modulus material or a liquid that surrounds the electronics and resides in a thin elastomeric shell provides a strain-isolation effect that enhances not only the wearability but also the range of stretchability in suitably designed devices. The results presented here build on these concepts by (1) replacing traditional liquids explored in the past, which have some nonnegligible vapor pressure and finite permeability through the encapsulating elastomers, with ionic liquids to eliminate any possibility for leakage or evaporation, and (2) positioning the liquid between the electronics and the skin, within an enclosed, elastomeric microfluidic space, but not in direct contact with the active elements of the system, to avoid any negative consequences on electronic performance...
December 27, 2016: Small
https://www.readbyqxmd.com/read/28024367/fully-printed-stretchable-thin-film-transistors-and-integrated-logic-circuits
#6
Le Cai, Suoming Zhang, Jinshui Miao, Zhibin Yu, Chuan Wang
This paper reports intrinsically stretchable thin-film transistors (TFTs) and integrated logic circuits directly printed on elastomeric polydimethylsiloxane (PDMS) substrates. The printed devices utilize carbon nanotubes and a type of hybrid gate dielectric comprising PDMS and barium titanate (BaTiO3) nanoparticles. The BaTiO3/PDMS composite simultaneously provides high dielectric constant, superior stretchability, low leakage, as well as good printability and compatibility with the elastomeric substrate. Both TFTs and logic circuits can be stretched beyond 50% strain along either channel length or channel width directions for thousands of cycles while showing no significant degradation in electrical performance...
December 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/28009903/creep-and-fatigue-resistant-rapid-piezoresistive-responses-of-elastomeric-graphene-coated-carbon-nanotube-aerogels-over-a-wide-pressure-range
#7
Michelle N Tsui, Mohammad F Islam
Lightweight, flexible piezoresistive materials with wide operational pressure ranges are in demand for applications such as human physical activity and health monitoring, robotics, and for functional interfacing between living systems and wearable electronics. Piezoresistivity of many elastomeric foams of polymers and carbon allotropes satisfies much of the required characteristics for these applications except creep and fatigue resistance due to their viscoelasticity, critically limiting the reliability and lifetime of integrated devices...
January 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/27983777/aging-of-silicon-nanocrystals-on-elastomer-substrates-photoluminescence-effects
#8
Rajib Mandal, Rebecca J Anthony
Nanocrystalline silicon is widely known as an efficient and tunable optical emitter and is attracting great interest for applications such as light-emitting devices (LEDs), electronic displays, sensors, and solar-photovoltaics. To date, however, luminescent silicon nanocrystals have been used exclusively in traditional rigid devices, leaving a gap in knowledge regarding how they behave on elastomeric substrates. The present study shows how the optical and structural/morphological properties of plasma-synthesized silicon nanocrystals (SiNCs) change when they are deposited on stretchable substrates made from polydimethylsiloxane (PDMS)...
December 28, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27960462/twistable-and-stretchable-sandwich-structured-fiber-for-wearable-sensors-and-supercapacitors
#9
Changsoon Choi, Jae Myeong Lee, Shi Hyeong Kim, Seon Jeong Kim, Jiangtao Di, Ray H Baughman
Twistable and stretchable fiber-based electrochemical devices having high performance are needed for future applications, including emerging wearable electronics. Weavable fiber redox supercapacitors and strain sensors are here introduced, which comprise a dielectric layer sandwiched between functionalized buckled carbon nanotube electrodes. On the macroscopic scale, the sandwiched core rubber of the fiber acts as a dielectric layer for capacitive strain sensing and as an elastomeric substrate that prevents electrical shorting and irreversible structural changes during severe mechanical deformations...
December 14, 2016: Nano Letters
https://www.readbyqxmd.com/read/27928107/ultrasonic-monitoring-of-the-setting-of-silicone-elastomeric-impression-materials
#10
Chie Kanazawa, Ryosuke Murayama, Tetsuya Furuichi, Arisa Imai, Shunichi Suda, Hiroyasu Kurokawa, Toshiki Takamizawa, Masashi Miyazaki
This study used an ultrasonic measurement device to monitor the setting behavior of silicone elastomeric impression materials, and the influence of temperature on setting behavior was determined. The ultrasonic device consisted of a pulser-receiver, transducers, and an oscilloscope. The two-way transit time through the mixing material was divided by two to account for the down-and-back travel path; then it was multiplied by the sonic velocity. Analysis of variance and the Tukey honest significant difference test were used...
December 6, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27918289/a-bioreactor-with-an-electro-responsive-elastomeric-membrane-for-mimicking-intestinal-peristalsis
#11
Daniele Cei, Joana Costa, Giulia Gori, Gabriele Frediani, Claudio Domenici, Federico Carpi, Arti Ahluwalia
This study describes an actuated bioreactor which mimics the pulsatile contractile motion of the intestinal barrier using electro-responsive elastomers as smart materials that undergo deformation upon electrical stimulation. The device consists of an annular dielectric elastomer actuator working as a radial artificial muscle able to rhythmically contract and relax a central cell culture well. The bioreactor maintained up to 4 h of actuation at a frequency of 0.15 Hz and a strain of 8%-10%, to those of the cyclic contraction and relaxation of the small intestine...
December 5, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27856307/mechanoresponsive-materials-for-drug-delivery-harnessing-forces-for-controlled-release
#12
REVIEW
Julia Wang, Jonah A Kaplan, Yolonda L Colson, Mark W Grinstaff
Mechanically-activated delivery systems harness existing physiological and/or externally-applied forces to provide spatiotemporal control over the release of active agents. Current strategies to deliver therapeutic proteins and drugs use three types of mechanical stimuli: compression, tension, and shear. Based on the intended application, each stimulus requires specific material selection, in terms of substrate composition and size (e.g., macrostructured materials and nanomaterials), for optimal in vitro and in vivo performance...
January 1, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/27809475/elastomeric-light-emitting-polymer-enhanced-by-interpenetrating-networks
#13
Huier Gao, Si Chen, Jiajie Liang, Qibing Pei
Conjugated polymers containing long-chain alkyl side groups for solubility are generally unstretchable: large strain induces crack formation, fracture, or plastic deformation. When the polymers are stretched to reorient the conjugated chains along the stretching direction, high dichroic ratio is observed both for absorption of the ground state and radiative decay of the excited state. Here an interpenetrating polymer network (IPN) approach is reported to impart elastomeric deformability to a conjugated polymer...
November 30, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27761525/a-simple-check-valve-for-microfluidic-point-of-care-diagnostics
#14
C S Ball, R F Renzi, A Priye, R J Meagher
Check valves are often essential components in microfluidic devices, enabling automated sample processing for diagnostics at the point of care. However, there is an unmet need for a check valve design that is compatible with rigid thermoplastic devices during all stages of development-from initial prototyping with a laser cutter to final production with injection molding. Here, we present simple designs for a passive, normally closed check valve that is manufactured from commonly available materials with a CO2 laser and readily integrated into prototype and production thermoplastic devices...
November 1, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27749848/tunable-window-device-based-on-micro-wrinkling-of-nanometric-zinc-oxide-thin-film-on-elastomer
#15
Milan Shrestha, Gih-Keong Lau
This Letter presents a tunable window device based on microscopic wrinkling of a transparent elastomeric surface. "Crack-free" microscopic wrinkling of a 50-nm ZnO thin film is possible on a highly adhesive acrylic elastomer membrane (VHB 4910) upon partial release from a large radial pre-stretch of membrane. This ZnO-based tunable window device demonstrates reversible tunability between transparent and translucent states. At zero compression with a flat surface, the device is transparent with a 93% in-line transmittance at 550-nm wavelength...
October 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27748597/renewable-solid-electrodes-in-microfluidics-recovering-the-electrochemical-activity-without-treating-the-surface
#16
Carlos A Teixeira, Gabriela F Giordano, Maisa B Beltrame, Luis C S Vieira, Angelo L Gobbi, Renato S Lima
The contamination, passivation, or fouling of the detection electrodes is a serious problem undermining the analytical performance of electroanalytical devices. The methods to regenerate the electrochemical activity of the solid electrodes involve mechanical, physical, or chemical surface treatments that usually add operational time, complexity, chemicals, and further instrumental requirements to the analysis. In this paper, we describe for the first time a reproducible method for renewing solid electrodes whenever their morphology or composition are nonspecifically changed without any surface treatment...
November 15, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27735061/spallation-of-small-particles-from-peristaltic-pump-tube-segments
#17
Yi Liu, Monica Faria, Edward Leonard
In most extracorporeal filtration devices such as hemodialysis a peristaltic pump is used to circulate blood. Pump function requires the repeated compression of an elastomeric tube from which particles may be shed into the circulatory system, a process called spallation. Earlier studies are likely to have missed the large number of small particles (<2 µm in diameter) that appear. The present study uses more modern equipment that detects and sizes particles down to 0.6 µm. As polyvinyl chloride (PVC) tubing is commonly used for this process, a series of studies was conducted on three different types to study its spallation characteristics, along with a co-extruded PVC/polyurethane tubing known for its enhanced biocompatibility properties...
October 13, 2016: Artificial Organs
https://www.readbyqxmd.com/read/27717071/a-stretchable-multicolor-display-and-touch-interface-using-photopatterning-and-transfer-printing
#18
Shuo Li, Bryan N Peele, Chris M Larson, Huichan Zhao, Robert F Shepherd
An intrinsically soft and stretchable multicolor display and touch interface is reported. Red, green, and blue pixels are formed separately by photopatterning transition-metal-doped ZnS embedded in silicone gels and transfer printing onto an elastomeric dielectric sheet. The device shows stable illumination while being stretched up to 200% area strain or under different deformation modalities. It also introduces capabilities for dynamic colorations and multipoint capacitive touch sensing.
September 22, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27683240/protein-crystallization-in-an-actuated-microfluidic-nanowell-device
#19
Bahige G Abdallah, Shatabdi Roy-Chowdhury, Raimund Fromme, Petra Fromme, Alexandra Ros
Protein crystallization is a major bottleneck of structure determination by X-ray crystallography, hampering the process by years in some cases. Numerous matrix screening trials using significant amounts of protein are often applied, while a systematic approach with phase diagram determination is prohibited for many proteins that can only be expressed in small amounts. Here, we demonstrate a microfluidic nanowell device implementing protein crystallization and phase diagram screening using nanoscale volumes of protein solution per trial...
2016: Crystal Growth & Design
https://www.readbyqxmd.com/read/27670953/stretchable-materials-for-robust-soft-actuators-towards-assistive-wearable-devices
#20
Gunjan Agarwal, Nicolas Besuchet, Basile Audergon, Jamie Paik
Soft actuators made from elastomeric active materials can find widespread potential implementation in a variety of applications ranging from assistive wearable technologies targeted at biomedical rehabilitation or assistance with activities of daily living, bioinspired and biomimetic systems, to gripping and manipulating fragile objects, and adaptable locomotion. In this manuscript, we propose a novel two-component soft actuator design and design tool that produces actuators targeted towards these applications with enhanced mechanical performance and manufacturability...
September 27, 2016: Scientific Reports
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