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https://www.readbyqxmd.com/read/28441503/robust-uniform-and-highly-emissive-quantum-dot-polymer-films-and-patterns-using-thiol-ene-chemistry
#1
Markus 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 crosslinked quantum dots (QD)-polymer composite films and patterned highly emissive structures with ultra-high 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 crosslinked composites with loading rate above majority of those reported in literature (<1%) and approaching 30%...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28439445/ultrasound-guided-continuous-interpectoral-block-for-patient-undergoing-mastectomy-and-axillary-clearance
#2
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
#3
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
#4
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
#5
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
#6
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
https://www.readbyqxmd.com/read/28419685/scaffolds-for-epithelial-tissue-engineering-customized-in-elastomeric-molds
#7
Mohamed-Nur Abdallah, Sara Abdollahi, Marco Laurenti, Dongdong Fang, Simon D Tran, Marta Cerruti, Faleh Tamimi
Restoration of soft tissue defects remains a challenge for surgical reconstruction. In this study, we introduce a new approach to fabricate poly(d,l-lactic acid) (PDLLA) scaffolds with anatomical shapes customized to regenerate three-dimensional soft tissue defects. Highly concentrated polymer/salt mixtures were molded in flexible polyether molds. Microcomputed tomography showed that with this approach it was possible to produce scaffolds with clinically acceptable volume ratio maintenance (>90%). Moreover, this technique allowed us to customize the average pore size and pore interconnectivity of the scaffolds by using variations of salt particle size...
April 18, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28415424/development-of-strong-biodegradable-and-highly-elastomeric-polycitrate-gelatin-hybrid-polymer-with-enhanced-cellular-biocompatibility
#8
Caiting Feng, Yuzhang Du, Yannan Li, Bo Lei
Native human tissues possess incomparable biological performance due to their strong and viscoelastic mechanical properties, and biocompatible compositions. Herein, by a thermal polymerization and solvent hybridization method, we develop biomimetic polycitrate-gelatin hybrid polymers (PC-GT) with strong mechanical properties and tailored elastomeric behavior for tissue regeneration applications. The incorporation of gelatin significantly enhanced the mechanical properties and cellular biocompatibility of PC...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28401212/filler-flocculation-in-polymers-a-simplified-model-derived-from-thermodynamics-and-game-theory
#9
K W Stöckelhuber, S Wießner, A Das, G Heinrich
The performance of elastomeric materials, i.e. in car tires, is substantially determined by the used reinforcing filler system. In particular, the flocculation tendency of filler particles to form clusters and even network-like structures significantly determines the mechanical properties of these elastomer materials and enhances especially their energy dissipation under periodic mechanical deformations. In a simplified thermodynamic model, inspired by a segregation model from game theory, we describe fundamental mechanisms of filler structure formation...
April 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/28391119/influence-of-aeration-cycles-on-mechanical-characteristics-of-elastomeric-diffusers-in-biological-intermittent-processes-accelerated-tests-in-real-environment
#10
Anna Laura Eusebi, Tiziano Bellezze, Gianluca Chiappini, Marco Sasso, Paolo Battistoni
The paper deals with the evaluation of the effect of on/off switching of diffuser membranes, in the intermittent aeration process of the urban wastewater treatments. Accelerated tests were done using two types of commercial EPDM diffusers, which were submitted to several consecutive cycles up to the simulation of more than 8 years of real working conditions. The effect of this switching on the mechanical characteristics of the membranes was evaluated in terms of pressure increment of the air operating at different flow rates (2, 3...
February 27, 2017: Water Research
https://www.readbyqxmd.com/read/28387497/light-stimulated-permanent-shape-reconfiguration-in-cross-linked-polymer-microparticles
#11
Lewis Michael Cox, Xiaohao Sun, Chen Wang, Nancy Sowan, Jason P Killgore, Rong Long, Heng-An Wu, Christopher N Bowman, Yifu Ding
Reconfiguring the permanent shape of elastomeric microparticles has been impossible due to the incapability of plastic deformation in these materials. To address this limitation, we synthesize the first instance of microparticles comprising a covalent adaptable network (CAN). CANs are cross-linked polymer networks capable of reconfiguring their network topology, enabling stress relaxation and shape changing behaviors, and reversible addition-fragmentation chain transfer (RAFT) is the corresponding dynamic chemistry used in this work to enable CAN-based microparticles...
April 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28383792/polyxydroxybutyrate-and-polyhydroxydodecanoate-produced-by-burkholderia-contaminans-ipt553-phb-and-phdd-produced-by-burkholderia
#12
Fernanda Matias, Carlos Alberto Brandt, Elda Sabino da Silva, Maria Filomena de Andrade Rodrigues
In this paper, we introduce a new Burkholderia contaminans capable of producing a newly characterized polymer METHODS AND RESULTS: CG-MS and Magnetic Nuclear Resonance (1) H and (13) C were used to determine the constitution of polymers produced on glucose, glucose with casein, sucrose, and sucrose with casein. Three pairs of primers were used to find the PHA synthase class and sequence. The synthesized polymers were composed by short chain length-PHA (scl-PHA), especially polyhydroxybutyrate (PHB), and medium chain length-PHAs (mcl-PHA), especially polyhydroxydodecanoate (PHDd) and their concentration, constitution, and molecular weight depend on carbon source used...
April 6, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28373385/wrinkling-instabilities-in-soft-bilayered-systems
#13
Silvia Budday, Sebastian Andres, Bastian Walter, Paul Steinmann, Ellen Kuhl
Wrinkling phenomena control the surface morphology of many technical and biological systems. While primary wrinkling has been extensively studied, experimentally, analytically and computationally, higher-order instabilities remain insufficiently understood, especially in systems with stiffness contrasts well below 100. Here, we use the model system of an elastomeric bilayer to experimentally characterize primary and secondary wrinkling at moderate stiffness contrasts. We systematically vary the film thickness and substrate prestretch to explore which parameters modulate the emergence of secondary instabilities, including period-doubling, period-tripling and wrinkle-to-fold transitions...
May 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28373050/microbial-based-synthesis-of-highly-elastomeric-biodegradable-poly-3-hydroxybutyrate-co-4-hydroxybutyrate-thermoplastic
#14
Kai-Hee Huong, Chin-Hoe Teh, A A Amirul
This study reports the production of P(3HB-co-4HB) [Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)] in possession of high molecular weight and elastomeric properties by Cupriavidus sp. USMAA1020 in single-stage mixed-substrate cultivation system. 1,4-butanediol and 1,6-hexanediol are found to be efficient substrate mixture that has resulted in high copolymer yield, occupying a maximum of 70wt% of the total biomass and producing higher 4HB monomer composition ranging from 31mol% to 41mol%. In substrate mixtures involving 1,6-hexanediol, cleavage of the 6-hydroxyhexanoyl-CoA produces Acetyl-CoA and 4-hydroxybutyryl-CoA...
April 1, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28369686/on-demand-tuned-hazard-free-elastomeric-composites-a-green-approach
#15
Partheban Manoharan, Narayan Chandra Das, Kinsuk Naskar
Rising ecological concerns and depletion of the potentially harmful environmental impacts caused by rubber products, are of prime importance in the industry. Therefore, implementation of sustainable greener materials is required to minimize the detrimental influences. In this research, we investigated the beneficial influence of naturally derived bio-resin towards the effects of association with Zinc Oxide Nanoparticles in highly dispersible silica (HDS) reinforced Natural rubber (NR)/Epoxidized Natural Rubber (ENR) based composites...
March 31, 2017: Biopolymers
https://www.readbyqxmd.com/read/28368941/continuous-ropivacaine-subfascial-wound-infusion-compared-with-intrathecal-morphine-for-postcesarean-analgesia-a-prospective-randomized-controlled-double-blind-study
#16
Manon Lalmand, Madeleine Wilwerth, Jean-François Fils, Philippe Van der Linden
BACKGROUND: After cesarean delivery, postoperative pain management allows early rehabilitation and helps prevent postpartum depression and chronic pain. Our present prospective, randomized controlled, double-blind study assessed the duration and effect of intrathecal analgesia and continuous ropivacaine wound infiltration versus a control group after cesarean delivery. The primary outcome was analgesia duration, defined as time to first morphine request. Secondary outcomes were cumulative postoperative morphine consumption, number of patients who did not require IV morphine, incidence of adverse effects, and time to first ambulation...
March 31, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28367828/zidovudine-continuous-infusion-in-an-hiv-infected-pregnant-woman-with-a-phobia-of-swallowing-pills
#17
Matthijs van Luin, Gerjanne Ter Beest, Lia E Wijnberger, Caroline Ma Swanink, David M Burger, Jet H Gisolf
The authors report the difficulties of preventing mother to child transmission in a pregnant HIV-infected woman with a phobia of swallowing pills. After multiple attempts and just as many failures, the authors ended up with cART consisting of small tablets of nevirapine, lamivudine and a continuous intravenous infusion of zidovudine given via an elastomeric pump at home. This case demonstrates the difficulties that HIV-physicians can encounter in pregnant women who have difficulties in swallowing tablets. In exceptional circumstances, continuous infusion of zidovudine may be an option, even in an outpatient setting...
April 3, 2017: Antiviral Therapy
https://www.readbyqxmd.com/read/28367567/the-shape-memory-effect-in-ionic-elastomers-fixation-through-ionic-interactions
#18
Antonio González-Jiménez, Marta A Malmierca, Pilar Bernal-Ortega, Pilar Posadas, Roberto Pérez-Aparicio, Ángel Marcos-Fernández, Patrick T Mather, Juan L Valentín
Shape-memory elastomers based on a commercial rubber cross-linked by both ionic and covalent bonds have been developed. The elastomeric matrix was a carboxylated nitrile rubber (XNBR) vulcanized with magnesium oxide (MgO) providing ionic interactions that form hierarchical structures. The so-named ionic transition is used as the unique thermal transition responsible for the shape-memory effect (SME) in these elastomers. These ionic interactions fix the temporary shape due to their behavior as dynamic cross-links with temperature changes...
April 19, 2017: Soft Matter
https://www.readbyqxmd.com/read/28364896/sixteen-week-analysis-of-unaltered-elastomeric-chain-relating-in-vitro-force-degradation-with-in-vivo-extraction-space-tooth-movement
#19
Kristin S Evans, Cory M Wood, Allen H Moffitt, John A Colgan, J Kevin Holman, Steven D Marshall, D Spencer Pope, Lew B Sample, Stephen L Sherman, Peter M Sinclair, Tim S Trulove
INTRODUCTION: The purposes of this study were to evaluate whether unaltered elastomeric chain can continue to move teeth for 16 weeks and to relate it to the amount of force remaining for the same batch of elastomeric chains. METHODS: The in-vivo portion of the study had a sample of 30 paired extraction space sites from 22 subjects who were measured for closure of the space every 28 days. The altered side elastomeric chain served as the control and was replaced at 28-day intervals whereas the experimental side remained unaltered...
April 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28357823/an-assessment-of-the-performance-of-the-baxter-elastomeric-lv10-infusor%C3%A2-pump-under-hyperbaric-conditions
#20
Lachlan Frawley, Bridget Devaney, Theo Tsouras, Geoff Frawley
BACKGROUND: The BBraun Perfusor Space™ syringe driver is already in use by ambulance services and retrieval teams but has not previously been assessed for hyperbaric chamber use. METHODS: Pump flow accuracy was tested at rates between 1 and 40 ml· h⁻¹ using three different brands of 50 ml syringe. Function of the occlusion alarms was assessed using the same syringes. The hyperbaric profile involved pressurisation to 284 kPa at 30 kPa· min⁻¹, 30 min at 284 kPa and decompression at 30 kPa· min⁻¹...
March 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
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