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https://www.readbyqxmd.com/read/28812353/dopamine-incorporated-dual-bioactive-electroactive-shape-memory-polyurethane-elastomers-with-physiological-shape-recovery-temperature-high-stretchability-and-enhanced-c2c12-myogenic-differentiation
#1
Xin Zhao, Ruonan Dong, Baolin Guo, Peter X Ma
Soft tissue engineering needs elastic biomaterials not only mimicking the elasticity of soft tissue but also possessing multiple bioactivity to promote cell adhesion, proliferation and differentiation, which still remains ongoing challenges. Herein, we synthesized a series of dopamine-incorporated dual bioactive electroactive shape memory polyurethane elastomers by combining the properties of elastomeric poly(citric acid-co-polycaprolactone) (CA-PCL) polyurethane elastomer, bioactive dopamine (DA) and electroactive aniline hexamer (AH)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805880/vacuum-filling-of-complex-microchannels-with-liquid-metal
#2
Yiliang Lin, Olivia Gordon, M Rashed Khan, Neyanel Vasquez, Jan Genzer, Michael D Dickey
This paper describes the utilization of vacuum to fill complex microchannels with liquid metal. Microchannels filled with liquid metal are useful as conductors for soft and stretchable electronics, as well as for microfluidic components such as electrodes, antennas, pumps, or heaters. Liquid metals are often injected manually into the inlet of a microchannel using a syringe. Injection can only occur if displaced air in the channels has a pathway to escape, which is usually accomplished using outlets. The positive pressure (relative to atmosphere) needed to inject fluids can also cause leaks or delamination of the channels during injection...
August 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28802784/a-hybrid-straightwire-technique
#3
Daniel Celli, Lorenza Catalfamo, Enrico Gasperoni, Roberto Deli
An original straightwire appliance was developed in order to easily adapt force and friction to the different stages and needs of treatment. The appliance features: (1) conventional brackets with a 0.020×0.030″ slot in the anterior area, passive self-ligating brackets with a 0.022×0.030″ slot in the lateral area, and tubes with a 0.022×0.030″ slot in the molar area; (2) archwires which adapt to the different stages of treatment and increase their section and stiffness progressively, starting with 0...
August 9, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28795567/buckled-thin-film-transistors-and-circuits-on-soft-elastomers-for-stretchable-electronics
#4
Giuseppe Cantarella, Christian Vogt, Raoul Hopf, Niko Münzenrieder, Panagiotis Andrianakis, Luisa Petti, Alwin Daus, Stefan Knobelspies, Lars Büthe, Gerhard Troester, Giovanni A Salvatore
Although recent progress in the field of flexible electronics has allowed the realization of biocompatible and conformable electronics, systematic approaches which combine high bendability (< 3 mm bending radius), high stretchability ( > 3-4 %) and low complexity in the fabrication process are still missing. Here, we show a technique to induce randomly-oriented and customized wrinkles on the surface of a biocompatible elastomeric substrate, where Thin-Film Transistors (TFTs) and circuits (inverter and logic NAND gates) based on Amorphous-IGZO are fabricated...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28794001/randomized-comparison-of-ridaforolimus-eluting-and-zotarolimus-eluting-coronary-stents-in-patients-with-coronary-artery-disease-primary-results-from-the-bionics-trial
#5
David E Kandzari, Pieter C Smits, Michael P Love, Ori Ben-Yehuda, Shmuel Banai, Simon D Robinson, Michael Jonas, Ran Kornowski, Rodrigo Bagur, Andres Iniguez, Haim D Danenberg, Robert L Feldman, Rajiv Jauhar, Harish Chandna, Manish A Parikh, Gidon Y Perlman, Mercedes Balcells, Peter M Markham, Melek Ozgu Ozan, Philippe Genereux, Elazer Edelman, Martin B Leon, Gregg W Stone
Background -The safety and efficacy of a novel cobalt alloy-based coronary stent with a durable elastomeric polymer eluting the antiproliferative agent ridaforolimus for treatment of patients with coronary artery disease is undetermined. Methods -A prospective, international 1:1 randomized trial was conducted to evaluate in a noninferiority design the relative safety and efficacy of ridaforolimus-eluting stents (RES) and slow-release zotarolimus-eluting stents (ZES) among 1,919 patients at 76 centers undergoing percutaneous coronary intervention...
August 9, 2017: Circulation
https://www.readbyqxmd.com/read/28791809/the-mechanical-strength-of-orthodontic-elastomeric-memory-chains-and-plastic-chains-an-in-vitro-study
#6
Hubert Kardach, Barbara Biedziak, Aneta Olszewska, Ewelina Golusińska-Kardach, Jerzy Sokalski
BACKGROUND: The loss of physical properties of orthodontic chains has been a topic of discussion among scientists and clinicians, motivating efforts to improve elastic materials and minimize the decrease of force. Orthodontic companies have introduced memory elastomers, which, according to the manufacturers, have improved mechanical properties. OBJECTIVES: The aim of the study was to evaluate the effects of stretching elastomeric chains submerged in 37°C artificial saliva...
May 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28777510/the-historical-evolution-of-dental-impression-materials
#7
Ioannis Papadiochos, Sofia Papadiochou, Ioannis Emmanouil
The concept of impression making process in dentistry began in the mid 1800s. Dentists realized that the construction of a prosthetic restoration required both a detailed capture of the oral tissues along with stone cast fabrications. To accomplish these goals, impression materials were essential. Beeswax represents the first impression material, while important bechmarks during the historical evolution of dental impression materials are considered to be the introduction of dental trays in the early 1800s and the invention of the gutta-percha, thermoplastic resins and plaster of Paris...
July 2017: Journal of the History of Dentistry
https://www.readbyqxmd.com/read/28774150/new-elastomeric-materials-based-on-natural-rubber-obtained-by-electron-beam-irradiation-for-food-and-pharmaceutical-use
#8
Gabriela Craciun, Elena Manaila, Maria Daniela Stelescu
The efficiency of polyfunctional monomers as cross-linking co-agents on the chemical properties of natural rubber vulcanized by electron beam irradiation was studied. The following polyfunctional monomers were used: trimethylolpropane-trimethacrylate, zinc-diacrylate, ethylene glycol dimethacrylate, triallylcyanurate and triallylisocyanurate. The electron beam treatment was done using irradiation doses in the range of 75 kGy-300 kGy. The gel fraction, crosslink density and effects of different aqueous solutions, by absorption tests, have been investigated as a function of polyfunctional monomers type and absorbed dose...
December 21, 2016: Materials
https://www.readbyqxmd.com/read/28773044/generating-bulk-scale-ordered-optical-materials-using-shear-assembly-in-viscoelastic-media
#9
REVIEW
Chris E Finlayson, Jeremy J Baumberg
We review recent advances in the generation of photonics materials over large areas and volumes, using the paradigm of shear-induced ordering of composite polymer nanoparticles. The hard-core/soft-shell design of these particles produces quasi-solid "gum-like" media, with a viscoelastic ensemble response to applied shear, in marked contrast to the behavior seen in colloidal and granular systems. Applying an oscillatory shearing method to sub-micron spherical nanoparticles gives elastomeric photonic crystals (or "polymer opals") with intense tunable structural color...
June 22, 2017: Materials
https://www.readbyqxmd.com/read/28772972/frequency-stable-ionic-type-hybrid-gate-dielectrics-for-high-mobility-solution-processed-metal-oxide-thin-film-transistors
#10
Jae Sang Heo, Seungbeom Choi, Jeong-Wan Jo, Jingu Kang, Ho-Hyun Park, Yong-Hoon Kim, Sung Kyu Park
In this paper, we demonstrate high mobility solution-processed metal-oxide thin-film transistors (TFTs) by using a high-frequency-stable ionic-type hybrid gate dielectric (HGD). The HGD gate dielectric, a blend of sol-gel aluminum oxide (AlOx) and poly(4-vinylphenol) (PVP), exhibited high dielectric constant (ε~8.15) and high-frequency-stable characteristics (1 MHz). Using the ionic-type HGD as a gate dielectric layer, an minimal electron-double-layer (EDL) can be formed at the gate dielectric/InOx interface, enhancing the field-effect mobility of the TFTs...
June 3, 2017: Materials
https://www.readbyqxmd.com/read/28772442/bioactive-glass-fiber-reinforced-pgs-matrix-composites-for-cartilage-regeneration
#11
Marina Trevelin Souza, Samira Tansaz, Edgar Dutra Zanotto, Aldo R Boccaccini
Poly(glycerol sebacate) (PGS) is an elastomeric polymer which is attracting increasing interest for biomedical applications, including cartilage regeneration. However, its limited mechanical properties and possible negative effects of its degradation byproducts restrict PGS for in vivo application. In this study, a novel PGS-bioactive glass fiber (F18)-reinforced composite was developed and characterized. PGS-based reinforced scaffolds were fabricated via salt leaching and characterized regarding their mechanical properties, degradation, and bioactivity in contact with simulated body fluid...
January 20, 2017: Materials
https://www.readbyqxmd.com/read/28763290/powered-air-purifying-respirator-use-in-healthcare-effects-on-thermal-sensations-and-comfort
#12
Jeffrey B Powell, Jung-Hyun Kim, Raymond J Roberge
Twelve subjects wore an N95 filtering facepiece respirator (N95 FFR), one tight-fitting full facepiece powered air-purifying respirator (PAPR), two loose-fitting PAPRs, and one elastomeric/PAPR hybrid for 1 hr each during treadmill walking at 5.6 km/h while undergoing physiological and subjective response monitoring. No significant interaction (p≥.05) was noted between the five respirators in heart rate, respiratory rate, oxygen saturation, transcutaneous carbon dioxide, and perceptions of breathing effort or discomfort, exertion, facial heat, and overall body heat...
August 1, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28763289/improved-hearing-protector-attenuation-through-the-use-of-a-lubricant
#13
Timothy J Ryan, Rebecca S Meier, Ashley Tatarka
A study of 40 novice hearing protection users was conducted to determine if the use of lubricants with hearing protective plugs would enhance their attenuation. Three types of hearing protection devices (i.e., earplugs) were evaluated: roll-down PVC foam, mushroom-style polyurethane foam, and elastomeric flanged. For each earplug type, the right and left ear (dry and lubricated, respectively) personal attenuation rating was determined using a commercially available microphone in real-ear apparatus. Earplug efficacy was observed to increase in the presence of lubricants for all 3 plug types, with average mean elevations by earplug type ranging from 1...
August 1, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28761575/chemical-stability-of-ceftolozane-tazobactam-in-polyvinylchloride-bags-and-elastomeric-pumps
#14
Joseph Terracciano, Elizabeth G Rhee, Jacqueline Walsh
BACKGROUND: Elastomeric pumps are often used to administer intravenous antibiotics in the outpatient setting, but effective infusion requires that the drug remain stable in solution throughout the procedure. OBJECTIVE: To determine the chemical stability of ceftolozane/tazobactam when reconstituted and stored over an extended time in the AccuFlo (EMED Technologies, El Dorado Hills, California) and I-Flow Homepump Eclipse (Halyard, Alpharetta, Georgia) elastomeric pumps compared with the results of the label-supporting studies in polyvinylchloride (PVC) bags...
2017: Current Therapeutic Research, Clinical and Experimental
https://www.readbyqxmd.com/read/28760798/protocol-for-a-randomised-crossover-trial-to-evaluate-patient-and-nurse-satisfaction-with-electronic-and-elastomeric-portable-infusion-pumps-for-the-continuous-administration-of-antibiotic-therapy-in-the-home-the-comparing-home-infusion-devices-chid-study
#15
Jodie G Hobbs, Melissa K Ryan, Brett Ritchie, Janet K Sluggett, Andrew J Sluggett, Lucy Ralton, Karen J Reynolds
INTRODUCTION: Previous studies comparing satisfaction with electronic and elastomeric infusion pumps are limited, and improvements in size and usability of electronic pumps have since occurred. The Comparing Home Infusion Devices (CHID) study plans to assess patient and nurse satisfaction with an elastomeric and electronic pump for delivering intravenous antibiotic treatment in the home. Secondary objectives are to determine pump-related complications and actual antibiotic dose administered, evaluate temperature variation and compare pump operating costs...
July 31, 2017: BMJ Open
https://www.readbyqxmd.com/read/28753269/highly-sensitive-flexible-pressure-sensor-based-on-silver-nanowires-embedded-polydimethylsiloxane-electrode-with-microarray-structure
#16
Xingtian Shuai, Pengli Zhu, Wenjin Zeng, Yougen Hu, Xianwen Liang, Yu Zhang, Rong Sun, Ching-Ping Wong
Flexible pressure sensors have attracted increasing research interest because of their potential applications for wearable sensing devices. Herein, a highly sensitive flexible pressure sensor is exhibited based on the elastomeric electrodes and a microarray architecture. Polydimethylsiloxane (PDMS) substrate, coated with silver nanowires (AgNWs), is used as the top electrode, while polyvinylidene fluoride (PVDF) as the dielectric layer. Several transfer processes are applied on seeking facile strategy for the preparation of the bottom electrode via embedding AgNWs into the PDMS film of microarray structure...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737930/self-collapse-lithography
#17
Chuanzhen Zhao, Xiaobin Xu, Qing Yang, Tianxing Man, Steven J Jonas, Jeffrey J Schwartz, Anne M Andrews, Paul S Weiss
We report a facile, high-throughput soft lithography process that utilizes nanoscale channels formed naturally at the edges of microscale relief features on soft, elastomeric stamps. Upon contact with self-assembled monolayer (SAM) functionalized substrates, the roof of the stamp collapses, resulting in the selective removal of SAM molecules via a chemical lift-off process. With this technique, which we call self-collapse lithography (SCL), sub-30 nm patterns were achieved readily using masters with microscale features prepared by conventional photolithography...
July 31, 2017: Nano Letters
https://www.readbyqxmd.com/read/28736889/fast-adsorption-of-soft-hydrogel-microspheres-on-solid-surfaces-in-aqueous-solution
#18
Shusuke Matsui, Takuma Kureha, Seina Hiroshige, Mikihiro Shibata, Takayuki Uchihashi, Daisuke Suzuki
The real-time adsorption behavior of polymeric colloidal microspheres onto solid surfaces in aqueous solution was visualized for the first time using high-speed atomic force microscopy (HS-AFM) in order to reveal how the softness of the microspheres affects their dynamic adsorption. Studies that focus on the deformability of microspheres upon dynamic adsorption have not yet been reported, most likely on account of a lack of techniques that appropriately depict the dynamic adsorption and deformation behavior of individual microspheres at the nanoscale in real time...
July 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28726370/ultrastretchable-analog-digital-signal-transmission-line-with-carbon-nanotube-sheets
#19
Yourack Lee, Min-Kyu Joo, Viet Thong Le, Raquel Ovalle-Robles, Xavier Lepró, Márcio D Lima, Daniel G Suh, Han Young Yu, Young Hee Lee, Dongseok Suh
Stretchable conductors can be used in various applications depending on their own characteristics. Here, we demonstrate simple and robust elastomeric conductors that are optimized for stretchable electrical signal transmission line. They can withstand strains up to 600% without any substantial change in their resistance (≤10% as is and ≤1% with passivation), and exhibit suppressed charge fluctuations in the medium. The inherent elasticity of a polymeric rubber and the high conductivity of flexible, highly oriented carbon nanotube sheets were combined synergistically, without losing both properties...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28712784/effects-of-interventions-with-therapeutic-suits-clothing-on-impairments-and-functional-limitations-of-children-with-cerebral-palsy-a-systematic-review
#20
REVIEW
Kênnea M Almeida, Sérgio T Fonseca, Priscilla R P Figueiredo, Amanda A Aquino, Marisa C Mancini
BACKGROUND: Therapeutic suits or clothing whether associated with intensive protocols or not, became popular in the rehabilitation of children with cerebral palsy. Studies have reported positive effects of these suits on children's posture, balance, motor function and gait. A summary of current literature may help guide therapeutic actions. OBJECTIVE: To evaluate the available evidence on the effects of interventions based on the use of therapeutic suits in the treatment of impairments and functional limitations of children with cerebral palsy...
July 5, 2017: Brazilian Journal of Physical Therapy
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