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https://www.readbyqxmd.com/read/27856307/mechanoresponsive-materials-for-drug-delivery-harnessing-forces-for-controlled-release
#1
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...
November 14, 2016: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/27809475/elastomeric-light-emitting-polymer-enhanced-by-interpenetrating-networks
#2
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 re-orient 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 4, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27761525/a-simple-check-valve-for-microfluidic-point-of-care-diagnostics
#3
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
#4
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
#5
Carlos A Teixeira, Gabriela Furlan Giordano, Maisa B Beltrame, Luis Carlos Silveira Vieira, Angelo Luiz Gobbi, Renato Sousa 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 re-quirements to the analysis. In this paper, we describe for the first time a reproducible method for renewing solid electrodes when-ever their morphology or composition are non-specifically changed without any surface treatment...
October 17, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27735061/spallation-of-small-particles-from-peristaltic-pump-tube-segments
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/27619387/outpatient-multimodal-intravenous-analgesia-in-patients-undergoing-day-case-surgery-description-of-a-three-year-experience
#10
Magdalena Serra, Roser Vives, Montserrat Cañellas, Josep Planell, Joan Carles Oliva, Carmen Colilles, Caridad Pontes
BACKGROUND: The use of elastomeric devices for ambulatory intravenous pain treatment in Major Ambulatory Surgery (MAS) has been described to improve postoperative pain management. The objective of the study was to describe the first 3 years experience of the use of elastomeric devices for ambulatory intravenous pain treatment in MAS implemented at our site since 2010. METHODS: Data were retrieved from the medical records for all patients who, between January 2010 and March 2014, underwent surgical procedures at the ambulatory surgical centre at our hospital and were prescribed a home-based continuous intravenous analgesia...
September 13, 2016: BMC Anesthesiology
https://www.readbyqxmd.com/read/27571339/solvent-assisted-gel-printing-for-micropatterning-thin-organic-inorganic-hybrid-perovskite-films
#11
Beomjin Jeong, Ihn Hwang, Sung Hwan Cho, Eui Hyuk Kim, Soonyoung Cha, Jinseong Lee, Han Sol Kang, Suk Man Cho, Hyunyong Choi, Cheolmin Park
While tremendous efforts have been made for developing thin perovskite films suitable for a variety of potential photoelectric applications such as solar cells, field-effect transistors, and photodetectors, only a few works focus on the micropatterning of a perovskite film which is one of the most critical issues for large area and uniform microarrays of perovskite-based devices. Here we demonstrate a simple but robust method of micropatterning a thin perovskite film with controlled crystalline structure which guarantees to preserve its intrinsic photoelectric properties...
September 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/27571166/flexible-and-stretchable-piezoelectric-sensor-with-thickness-tunable-configuration-of-electrospun-nanofiber-mat-and-elastomeric-substrates
#12
Suk-Hee Park, Han Bit Lee, Si Mo Yeon, Jeanho Park, Nak Kyu Lee
Here, we developed highly sensitive piezoelectric sensors in which flexible membrane components were harmoniously integrated. An electrospun nanofiber mat of poly(vinylidenefluoride-co-trifluoroethylene) was sandwiched between two elastomer sheets with sputtered electrodes as an active layer for piezoelectricity. The developed sensory system was ultrasensitive in response to various microscale mechanical stimuli and able to perceive the corresponding deformation at a resolution of 1 μm. Owing to the highly flexible and resilient properties of the components, the durability of the device was sufficiently stable so that the measuring performance could still be effective under harsh conditions of repetitive stretching and folding...
September 21, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27547485/mechanics-and-thermal-management-of-stretchable-inorganic-electronics
#13
Jizhou Song, Xue Feng, Yonggang Huang
Stretchable electronics enables lots of novel applications ranging from wearable electronics, curvilinear electronics to bio-integrated therapeutic devices that are not possible through conventional electronics that is rigid and flat in nature. One effective strategy to realize stretchable electronics exploits the design of inorganic semiconductor material in a stretchable format on an elastomeric substrate. In this review, we summarize the advances in mechanics and thermal management of stretchable electronics based on inorganic semiconductor materials...
March 2016: National Science Review
https://www.readbyqxmd.com/read/27540212/what-is-the-maximum-temperature-reached-in-elastomeric-devices-under-simulated-opat-conditions
#14
Susanna van Der Merwe, Helen Green
AIM: Outpatient parenteral antimicrobial therapy (OPAT), both in children and adults, is increasing in use as part of a cost saving measure for the NHS.1 However there is a general lack of stability data for antibiotics in elastomeric devices. The 'Yellow Covered Document'2 (YCD), as it is commonly known, specifies the storage conditions, under which stability testing should be carried out ranging from freezing to a worst case scenario of 37°C±2°C. It is assumed that a temperature of 37°C equates to wearing a device reservoir under clothing close to the body e...
September 2016: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/27519797/stable-propagation-of-mechanical-signals-in-soft-media-using-stored-elastic-energy
#15
Jordan R Raney, Neel Nadkarni, Chiara Daraio, Dennis M Kochmann, Jennifer A Lewis, Katia Bertoldi
Soft structures with rationally designed architectures capable of large, nonlinear deformation present opportunities for unprecedented, highly tunable devices and machines. However, the highly dissipative nature of soft materials intrinsically limits or prevents certain functions, such as the propagation of mechanical signals. Here we present an architected soft system composed of elastomeric bistable beam elements connected by elastomeric linear springs. The dissipative nature of the polymer readily damps linear waves, preventing propagation of any mechanical signal beyond a short distance, as expected...
August 30, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27458878/adhesiveless-transfer-printing-of-ultrathin-microscale-semiconductor-materials-by-controlling-the-bending-radius-of-an-elastomeric-stamp
#16
Sungbum Cho, Namyun Kim, Kwangsun Song, Jongho Lee
High-performance electronic devices integrated onto unconventional substrates provide opportunities for use in diverse applications, such as wearable or implantable forms of electronic devices. However, the interlayer adhesives between the electronic devices and substrates often limit processing temperature or cause electrical or thermal resistance at the interface. This paper introduces a very simple but effective transfer printing method that does not require an interlayer adhesive. Controlling the bending radius of a simple flat stamp enables picking up or printing of microscale semiconductor materials onto rigid, curvilinear, or flexible surfaces without the aid of a liquid adhesive...
August 9, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27444239/lipopeptides-from-bacillus-subtilis-ac7-inhibit-adhesion-and-biofilm-formation-of-candida-albicans-on-silicone
#17
Chiara Ceresa, Maurizio Rinaldi, Valeria Chiono, Irene Carmagnola, Gianna Allegrone, Letizia Fracchia
Candida albicans is the major fungus that colonises medical implants, causing device-associated infections with high mortality. Antagonistic bacterial products with interesting biological properties, such as biosurfactants, have recently been considered for biofilm prevention. This study investigated the activity of lipopeptide biosurfactant produced by Bacillus subtilis AC7 (AC7 BS) against adhesion and biofilm formation of C. albicans on medical-grade silicone elastomeric disks (SEDs). Chemical analysis, stability, surface activities of AC7 BS crude extract and physicochemical characterisation of the coated silicone disk surfaces were also carried out...
October 2016: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/27438370/wearable-tactile-sensor-based-on-flexible-microfluidics
#18
Joo Chuan Yeo, Jiahao Yu, Zhao Ming Koh, Zhiping Wang, Chwee Teck Lim
In this work, we develop a liquid-based thin film microfluidic tactile sensor of high flexibility, robustness and sensitivity. The microfluidic elastomeric structure comprises a pressure sensitive region and parallel arcs that interface with screen-printed electrodes. The microfluidic sensor is functionalized with a highly conductive metallic liquid, eutectic gallium indium (eGaIn). Microdeformation on the pressure sensor results in fluid displacement which corresponds to a change in electrical resistance. By emulating parallel electrical circuitry in our microchannel design, we reduced the overall electrical resistance of the sensor, therefore enhancing its device sensitivity...
August 16, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27419266/elastomeric-pdms-planoconvex-lenses-fabricated-by-a-confined-sessile-drop-technique
#19
S Ekgasit, N Kaewmanee, P Jangtawee, C Thammacharoen, M Donphoongpri
The ubiquity of high quality smartphones at affordable prices not only accelerated the social penetration in the global population but also promoted nontraditional usage of smartphones as point-of-care medical diagnostic devices, sensors, and portable digital microscopes. This paper reveals a simple, rapid, cost-effective, and template-free technique for mass-scale production of an elastomeric PDMS (ePDMS) planoconvex lens capable of converting a smartphone into a portable digital microscope. By taking advantage of the resistance to spreading of liquid by a sharp edge, highly stable spherical cap of viscous liquid PDMS (lPDMS) on a smooth PMMA circular disk was fabricated...
August 10, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27377673/redox-reducible-and-hydrolytically-degradable-peg-pla-elastomers-as-biomaterial-for-temporary-drug-eluting-medical-devices
#20
Simona Rupnik, Sytze Buwalda, Stéphane Dejean, Audrey Bethry, Xavier Garric, Jean Coudane, Benjamin Nottelet
With the aim to develop biomaterials for temporary medical devices, a series of novel reducible and/or degradable elastomers has been prepared from PLA-b-PEG-b-PLA copolymers photo-crosslinked with diallyl sulfide or pentaerythritol tetrakis(3-mercaptopropionate). Thermal and mechanical properties, including elastic limit and Young modulus, are assessed. Degradation is then evaluated under standard hydrolytic conditions. Reducibility of a selected elastomer is then illustrated using 2-mercaptoethanol or glutathione as reducing agents...
July 5, 2016: Macromolecular Bioscience
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