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https://www.readbyqxmd.com/read/28535341/fully-stretchable-optoelectronic-sensors-based-on-colloidal-quantum-dots-for-sensing-photoplethysmographic-signals
#1
Tae-Ho Kim, Chang-Seok Lee, Sangwon Kim, Jaehyun Hur, Sangmin Lee, Keun Wook Shin, Young-Zoon Yoon, Moon Kee Choi, Jiwoong Yang, Dae-Hyeong Kim, Taeghwan Hyeon, Seongjun Park, Sungwoo Hwang
Flexible and stretchable optoelectronic devices can be potentially applied in displays, biosensors, biomedicine, robotics, and energy generation. The use of nanomaterials with superior optical properties such as quantum dots (QDs) is important in the realization of wearable displays and biomedical devices, but specific structural design as well as selection of materials should preferentially accompany this technology to realize stretchable forms of these devices. Here, we report stretchable optoelectronic sensors manufactured using colloidal QDs and integrated with elastomeric substrates, whose optoelectronic properties are stable under various deformations...
May 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28528117/composite-elastomeric-polyurethane-scaffolds-incorporating-small-intestinal-submucosa-for-soft-tissue-engineering
#2
Lincui Da, Mei Gong, Anjing Chen, Yi Zhang, Yizhou Huang, Zhijun Guo, Shengfu Li, Jesse Li-Ling, Li Zhang, Huiqi Xie
Although soft tissue replacement has been clinically successful in many cases, the corresponding procedure has many limitations including the lack of resilience and mechanical integrity, significant donor-site morbidity, volume loss with time, and fibrous capsular contracture. These disadvantages can be alleviated by utilizing bio-absorbable scaffolds with high resilience and large strain, which are capable of stimulating natural tissue regeneration. Hence, the chemically crosslinked tridimensional scaffolds obtained by incorporating water-based polyurethane (PU) (which was synthesized from polytetramethylene ether glycol, isophorone diisocyanate, and 2,2-bis(hydroxymethyl) butyric acid) into a bioactive extracellular matrix consisting of small intestinal submucosa (SIS) have been tested in this study to develop a new approach for soft tissue engineering...
May 17, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28524191/thermal-scribing-to-prototype-plastic-microfluidic-devices-applied-to-study-the-formation-of-neutrophil-extracellular-traps
#3
Arvind Chandrasekaran, Nikita Kalashnikov, Roni Rayes, Claire Wang, Jonathan Spicer, Christopher Moraes
Innovation in microfluidics-based biological research has been aided by the growing accessibility of versatile microscale fabrication techniques, particularly in rapid prototyping of elastomeric polydimethylsiloxane (PDMS) based devices. However, the use of PDMS presents considerable and often unexpected limitations, particularly in interpreting and validating biological data. To rapidly prototype microfluidic culture systems in conventional plastics commonly used in cell culture, we developed 'thermal scribing', a one-step micromachining technique in which thermoplastics are locally patterned by a heated tip, moving in user-controlled patterns...
May 19, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28523760/bioinspired-composite-microfibers-for-skin-adhesion-and-signal-amplification-of-wearable-sensors
#4
Dirk-M Drotlef, Morteza Amjadi, Muhammad Yunusa, Metin Sitti
A facile approach is proposed for superior conformation and adhesion of wearable sensors to dry and wet skin. Bioinspired skin-adhesive films are composed of elastomeric microfibers decorated with conformal and mushroom-shaped vinylsiloxane tips. Strong skin adhesion is achieved by crosslinking the viscous vinylsiloxane tips directly on the skin surface. Furthermore, composite microfibrillar adhesive films possess a high adhesion strength of 18 kPa due to the excellent shape adaptation of the vinylsiloxane tips to the multiscale roughness of the skin...
May 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28512333/hybrid-organic-tandem-solar-cell-comprising-small-molecule-bottom-and-polymer-fullerene-top-subcells-fabricated-by-thin-film-transfer
#5
Yoonseok Ka, Hyejin Hwang, Changsoon Kim
Multilayer structures involving solution-deposited polymer films are difficult to fabricate, not allowing for unrestricted designs of polymer-based optoelectronic devices required for maximizing their performance. Here, we fabricate a hybrid organic tandem solar cell whose top and bottom subcells have polymer:fullerene and small molecules active layers, respectively, by a solvent-free process based on transferring the polymer:fullerene layer from an elastomeric stamp onto a vacuum-deposited bottom subcell. The interface between small-molecule and transferred polymer:fullerene layers is void-free at the nanoscale, allowing for efficient charge transport across the interface...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28507143/controllable-load-sharing-for-soft-adhesive-interfaces-on-three-dimensional-surfaces
#6
Sukho Song, Dirk-Michael Drotlef, Carmel Majidi, Metin Sitti
For adhering to three-dimensional (3D) surfaces or objects, current adhesion systems are limited by a fundamental trade-off between 3D surface conformability and high adhesion strength. This limitation arises from the need for a soft, mechanically compliant interface, which enables conformability to nonflat and irregularly shaped surfaces but significantly reduces the interfacial fracture strength. In this work, we overcome this trade-off with an adhesion-based soft-gripping system that exhibits enhanced fracture strength without sacrificing conformability to nonplanar 3D surfaces...
May 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28507126/direct-observation-of-structure-and-dynamics-during-phase-separation-of-an-elastomeric-protein
#7
Sean E Reichheld, Lisa D Muiznieks, Fred W Keeley, Simon Sharpe
Despite its growing importance in biology and in biomaterials development, liquid-liquid phase separation of proteins remains poorly understood. In particular, the molecular mechanisms underlying simple coacervation of proteins, such as the extracellular matrix protein elastin, have not been reported. Coacervation of the elastin monomer, tropoelastin, in response to heat and salt is a critical step in the assembly of elastic fibers in vivo, preceding chemical cross-linking. Elastin-like polypeptides (ELPs) derived from the tropoelastin sequence have been shown to undergo a similar phase separation, allowing formation of biomaterials that closely mimic the material properties of native elastin...
May 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28492311/pressure-sensitive-and-conductive-carbon-aerogels-from-poplars-catkins-for-selective-oil-absorption-and-oil-water-separation
#8
Lingxiao Li, Tao Hu, Hanxue Sun, Junping Zhang, Aiqin Wang
Multifunctional carbon aerogels that are both highly compressible and conductive have broad potential applications in the range of sound insulator, sensor, oil absorption and electronics. However, the preparation of such carbon aerogels has been proven to be very challenging. Here, we report fabrication of pressure-sensitive and conductive (PSC) carbon aerogels by pyrolysis of cellulose aerogels composed of poplars catkin (PC) microfibers with a tubular structure. The wet PC gels can be dried directly in an oven without any deformation, in marked contrast to the brittle nature of traditional carbon aerogels...
May 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28485567/stretchable-transparent-and-stretch-unresponsive-capacitive-touch-sensor-array-with-selectively-patterned-silver-nanowires-reduced-graphene-oxide-electrodes
#9
Taeyoung Choi, Byeong-Ung Hwang, Bo-Yeong Kim, Tran Quang Trung, Yun Hyoung Nam, Do-Nyun Kim, Kilho Eom, Nae-Eung Lee
Stretchable and transparent touch sensors are essential input devices for future stretchable transparent electronics. Capacitive touch sensors with a simple structure of only two electrodes and one dielectric are an established technology in current rigid electronics. However, the development of stretchable and transparent capacitive touch sensors has been limited due to changes in capacitance resulting from dimensional changes in elastomeric dielectrics and difficulty in obtaining stretchable transparent electrodes that are stable under large strains...
May 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28482527/rubber-elastomeric-nanocomposites-with-antimicrobial-properties
#10
Małgorzata Przybyłek, Mohamed Bakar, Mariola Mendrycka, Urszula Kosikowska, Anna Malm, Marta Worzakowska, Tomasz Szymborski, Karolina Kędra-Królik
In this paper we show an elastomeric nanocomposite that exhibits antibacterial and antifungal activity. It comprises a rubber blend matrix and a nanofiller, which is a modified bentonite clay (Nanobent® ZR2). We have developed innovative technology for the nanofiller incorporation into the rubber matrix. This new approach was successfully implemented in pilot production at the Polish chemical manufacturer Spoiwo (Spoldzielnia Pracy Chemiczno-Wytworczej 'Spoiwo', Radom, Poland). Here we reveal that addition of the functionalised bentonite affects the mechanical and thermal behaviour of elastomers...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28457658/pilot-scale-production-of-poly-3-hydroxybutyrate-co-4-hydroxybutyrate-biopolymers-with-high-molecular-weight-and-elastomeric-properties
#11
Kai-Hee Huong, Mat Junoh Azuraini, Nursolehah Abdul Aziz, Al-Ashraf Abdullah Amirul
Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [(P(3HB-co-4HB)] copolymer receives attention as next generation biomaterial in medical application. However, the exploitation of the copolymer is still constrained since such copolymer has not yet successfully been performed in industrial scale production. In this work, we intended to establish pilot production system of the copolymer retaining the copolymer quality which has recently discovered to have novel characteristic from lab scale fermentation. An increase of agitation speed has significantly improved the copolymer accumulation efficiency by minimizing the utilization of substrates towards cell growth components...
April 27, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28457187/laser-etched-designs-for-molding-hydrogel-based-engineered-tissues
#12
Fabiola Munarin, Nicholas J Kaiser, Tae Yun Kim, Bum-Rak Choi, Kareen L K Coulombe
Rapid prototyping and fabrication of elastomeric molds for sterile culture of engineered tissues allow for the development of tissue geometries that can be tailored to different in vitro applications and customized as implantable scaffolds for regenerative medicine. Commercially available molds offer minimal capabilities for adaptation to unique conditions or applications versus those for which they are specifically designed. Here we describe a replica molding method for the design and fabrication of poly(dimethylsiloxane) (PDMS) molds from laser-etched acrylic negative masters with ∼0...
May 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28456704/outpatient-treatment-of-osteomyelitis-with-telavancin
#13
Claudia P Schroeder, Lucinda J Van Anglen, Robin H Dretler, John S Adams, Richard C Prokesch, Quyen Luu, Andrew H Krinsky
Telavancin is a lipoglycopeptide antibiotic with bactericidal activity against Gram-positive pathogens including Staphylococcus aureus, the most frequent cause of osteomyelitis. Treatment is often challenging due to needs for surgical intervention along with prolonged administration of intravenous antimicrobials, frequently in an outpatient setting. This was a retrospective analysis of the efficacy and safety of telavancin for treatment of osteomyelitis provided as outpatient parenteral antimicrobial therapy (OPAT) in physician office infusion centres...
April 26, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28452417/crack-free-soft-wrinkles-enable-switchable-anisotropic-wetting
#14
Dongjoon Rhee, Won-Kyu Lee, Teri W Odom
Soft skin layers on elastomeric substrates are demonstrated to support mechano-responsive wrinkle patterns that do not exhibit cracking under applied strain. Soft fluoropolymer skin layers on pre-strained poly(dimethylsiloxane) slabs achieved crack-free surface wrinkling at high strain regimes not possible by using conventional stiff skin layers. A side-by-side comparison between the soft and hard skin layers after multiple cycles of stretching and releasing revealed that the soft skin layer enabled dynamic control over wrinkle topography without cracks or delamination...
June 1, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28441503/robust-uniform-and-highly-emissive-quantum-dot-polymer-films-and-patterns-using-thiol-ene-chemistry
#15
Marcus J Smith, Sidney T Malak, Jaehan Jung, Young Jun Yoon, Chun Hao Lin, Sunghan Kim, Kyung Min Lee, Ruilong Ma, Timothy J White, Timothy J Bunning, Zhiqun Lin, Vladimir V Tsukruk
This work demonstrates a facile and versatile method for generating low scattering cross-linked quantum dot (QD)-polymer composite films and patterned highly emissive structures with ultrahigh QD loading, minimal phase separation, and tunable mechanical properties. Uniform QD-polymer films are fabricated using thiol-ene chemistry, in which cross-linked polymer networks are rapidly produced in ambient conditions via fast UV polymerization in bulk to suppress QD aggregation. UV-controlled thiol-ene chemistry limits phase separation through producing highly QD loaded cross-linked composites with loadings above majority of those reported in the literature (<1%) and approaching 30%...
May 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28439445/ultrasound-guided-continuous-interpectoral-block-for-patient-undergoing-mastectomy-and-axillary-clearance
#16
Mario Fajardo-Pérez, Ece Yamak Altınpulluk, Javier García-Miguel, Borja Quintana-Gordon
Using a single dose of local anaesthetics has some disadvantages and provides limited analgesia depending on the pharmacokinetic characteristics of the local anaesthetic used. Nevertheless, the use of continuous perineural infusions allows sustained pain control. Ultrasound-guided interpectoral block followed by the placement of catheters in patients undergoing mastectomies with or without lymph node axillary dissections can result in sufficient pain control. We present a case of a 58-year-old woman undergoing mastectomy and axillary clearance who received ultrasound-guided continuous interpectoral block for postoperative analgesia...
April 2017: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/28433936/sustained-viral-gene-delivery-from-a-micro-fibrous-elastomeric-cardiac-patch-to-the-ischemic-rat-heart
#17
Xinzhu Gu, Yasumoto Matsumura, Ying Tang, Souvik Roy, Richard Hoff, Bing Wang, William R Wagner
Biodegradable and elastomeric patches have been applied to the surface of infarcted hearts as temporary mechanical supports to effectively alter adverse left ventricular remodeling processes. In this report, recombinant adeno-associated virus (AAV), known for its persistent transgene expression and low pathogenicity, was incorporated into elastomeric polyester urethane urea (PEUU) and polyester ether urethane urea (PEEUU) and processed by electrospinning into two formats (solid fibers and core-sheath fibers) designed to influence the controlled release behavior...
April 14, 2017: Biomaterials
https://www.readbyqxmd.com/read/28429757/soft-electronics-enabled-ergonomic-human-computer-interaction-for-swallowing-training
#18
Yongkuk Lee, Benjamin Nicholls, Dong Sup Lee, Yanfei Chen, Youngjae Chun, Chee Siang Ang, Woon-Hong Yeo
We introduce a skin-friendly electronic system that enables human-computer interaction (HCI) for swallowing training in dysphagia rehabilitation. For an ergonomic HCI, we utilize a soft, highly compliant ("skin-like") electrode, which addresses critical issues of an existing rigid and planar electrode combined with a problematic conductive electrolyte and adhesive pad. The skin-like electrode offers a highly conformal, user-comfortable interaction with the skin for long-term wearable, high-fidelity recording of swallowing electromyograms on the chin...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28425667/soft-multifunctional-composites-and-emulsions-with-liquid-metals
#19
REVIEW
Navid Kazem, Tess Hellebrekers, Carmel Majidi
Binary mixtures of liquid metal (LM) or low-melting-point alloy (LMPA) in an elastomeric or fluidic carrier medium can exhibit unique combinations of electrical, thermal, and mechanical properties. This emerging class of soft multifunctional composites have potential applications in wearable computing, bio-inspired robotics, and shape-programmable architectures. The dispersion phase can range from dilute droplets to connected networks that support electrical conductivity. In contrast to deterministically patterned LM microfluidics, LMPA- and LM-embedded elastomer (LMEE) composites are statistically homogenous and exhibit effective bulk properties...
April 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28420834/improving-the-efficacy-of-chlorhexidine-releasing-elastomerics-using-a-layerby-layer-coating-technique
#20
Hyun-Sun Jeon, Eun-Ha Jung, Si-Mook Kang, Eun-Song Lee, Jeong-Woo Lee, Baek-Il Kim
The aims of this study were to identify the optimal concentration of coated orthodontic elastomerics using a layer-by-layer technique that can release chlorhexidine (CHX) as an antimicrobial material, and to measure the physical properties and antimicrobial effects of the coated elastomerics. Ethyl cellulose (EC) was used as the polymer, and five study groups with various combinations of solvents (i.e., ethanol and dichloromethane [DCM]) were included. The coated elastomerics were evaluated with a spectrophotometer to confirm the release of CHX, and their surfaces were observed by SEM...
April 18, 2017: Dental Materials Journal
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