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https://www.readbyqxmd.com/read/28338313/ultimate-control-of-rate-dependent-adhesion-for-reversible-transfer-process-via-thin-elastomeric-layer
#1
Chan Kim, Min-Ah Yoon, Bongkyun Jang, Jae-Hyun Kim, Hak-Joo Lee, Kwang-Seop Kim
Adhesion between a stamp with an elastomeric layer and various devices or substrates is crucial to successfully fabricate flexible electronics using a transfer process. Although various transfer processes using stamps with different adhesion strengths have been suggested, the controllable range of adhesion is still limited to a narrow range. To precisely transfer devices onto selected substrates, however, the difference in adhesion between the picking and placing processes should be large enough to achieve a high yield...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28333680/physical-and-chemical-stability-of-urapidil-in-0-9-sodium-chloride-in-elastomeric-infusion-pump
#2
Cristina Tomasello, Anna Leggieri, Franco Rabbia, Franco Veglio, Lorena Baietto, Chiara Fulcheri, Amedeo De Nicolò, Giovanni De Perri, Antonio D'Avolio
Urapidil is an antihypertensive agent, usually administered through intravenous bolus injection, slow-intravenous infusion, or continuous-drug infusion by perfusor. Since to date no evidences are available on drug stability in elastomeric pumps, patients have to be hospitalized. The purpose of this study was to validate an ultra-performance liquid chromatographic method to evaluate urapidil stability in an elastomeric infusion pump, in order to allow continuous infusion as home-care treatment. Analyses were conducted by diluting urapidil in an elastomeric pump...
July 2016: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/28306203/highly-stretchable-superhydrophobic-composite-coating-based-on-self-adaptive-deformation-of-hierarchical-structures
#3
Xin Hu, Changyu Tang, Zhoukun He, Hong Shao, Keqin Xu, Jun Mei, Woon-Ming Lau
With the rapid development of stretchable electronics, functional textiles, and flexible sensors, water-proof protection materials are required to be built on various highly flexible substrates. However, maintaining the antiwetting of superhydrophobic surface under stretching is still a big challenge since the hierarchical structures at hybridized micro-nanoscales are easily damaged following large deformation of the substrates. This study reports a highly stretchable and mechanically stable superhydrophobic surface prepared by a facile spray coating of carbon black/polybutadiene elastomeric composite on a rubber substrate followed by thermal curing...
March 17, 2017: Small
https://www.readbyqxmd.com/read/28283831/patient-satisfaction-in-an-outpatient-parenteral-antimicrobial-therapy-opat-unit-practising-predominantly-self-administration-of-antibiotics-with-elastomeric-pumps
#4
L Saillen, L Arensdorff, E Moulin, R Voumard, C Cochet, N Boillat-Blanco, C Gardiol, S de Vallière
Self-administration of antibiotics using elastomeric pumps has become the most frequently used treatment modality at the outpatient parenteral antimicrobial therapy (OPAT) unit of the University Hospital of Lausanne. However, it remains unknown how comfortable patients feel using this mode of treatment. A questionnaire was offered to all patients treated at the OPAT unit between June 2014 and December 2015. The questionnaire was distributed to 188 patients and 112 questionnaires were returned. Seventy-one patients were treated by self-administration, 21 attended the OPAT unit on a daily basis, and 20 received their antibiotics from home-care nurses...
March 11, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28278475/robust-control-of-a-cable-driven-soft-exoskeleton-joint-for-intrinsic-human-robot-interaction
#5
Christopher Jarrett, Andrew McDaid
A novel, cable-driven soft joint is presented for use in robotic rehabilitation exoskeletons to provide intrinsic, comfortable human-robot interaction. The torque-displacement characteristics of the soft elastomeric core contained within the joint are modelled. This knowledge is used in conjunction with a dynamic system model to derive a sliding mode controller (SMC) to implement low-level torque control of the joint. The SMC controller is experimentally compared to a baseline feedback-linearised PD controller across a range of conditions and shown to be robust to un-modelled disturbances...
March 1, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28276240/biaxial-stretchability-and-transparency-of-ag-nanowire-2d-mass-spring-networks-prepared-by-floating-compression
#6
Byoung Soo Kim, Jun Beom Pyo, Jeong Gon Son, Goangseup Zi, Sang-Soo Lee, Jong Hyuk Park, Jonghwi Lee
Networks of silver nanowires (Ag NWs) have been considered as promising materials for stretchable and transparent conductors. Despite various improvements of their optoelectronic and electromechanical properties over the past few years, Ag NW networks with a sufficient stretchability in multiple directions that is essential for the accommodation of the multi-directional strains of human movement have seldom been reported. For this paper, biaxially-stretchable, transparent conductors were developed based on 2D mass-spring networks of wavy Ag NWs...
March 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28274765/engineering-mechanical-gradients-in-next-generation-biomaterials-lessons-learned-from-medical-textile-design
#7
Joanna L Ng, Ciara E Collins, Melissa L Knothe Tate
Nonwoven and textile membranes have been applied both externally and internally to prescribe boundary conditions for medical conditions as diverse as oedema and tissue defects. Incorporation of mechanical gradients in next generation medical membrane design offers great potential to enhance function in a dynamic, physiological context. Yet the gradient properties and resulting mechanical performance of current membranes are not well described. To bridge this knowledge gap, we tested and compared the mechanical properties of bounding membranes used in both external (compression sleeves for oedema, exercise bands) and internal (surgical membranes) physiological contexts...
March 5, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28274100/production-of-polyhydroxyalkanoates-from-sludge-palm-oil-using-pseudomonas-putida-s12
#8
Du-Kyeong Kang, Cho-Ryong Lee, Sun Hee Lee, Jung-Hoon Bae, Young-Kwon Park, Young Ha Rhee, Bong Hyun Sung, Jung-Hoon Sohn
Polyhydroxyalkanoates (PHAs) are biodegradable plastics produced by bacteria, but their use in diverse applications is prohibited by high production costs. To reduce these costs, the conversion of PHAs from crude sludge palm oil (SPO) as an inexpensive renewable raw material by Pseudomonas strains was tested. Pseudomonasputida S12 was found to produce the highest yield (~41%) of elastomeric medium-chain-length (MCL)-PHAs from SPO. The MCL-PHA characteristics were analyzed by gas-chromatography/mass spectrometry, gel permeation chromatography, and differential scanning calorimetry...
March 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28274033/an-in-vitro-comparative-stereomicroscopic-analysis-and-evaluation-of-marginal-accuracy-in-porcelain-fused-to-metal-copings-fabricated-in-two-different-finish-lines-using-variant-die-materials
#9
Priya L Vaswani, Pronob K Sanyal, Siddharth Y Gosavi, Abhijeet R Kore
INTRODUCTION: Limited published information is available about the influence of preparatory designs and die materials on marginal accuracy of porcelain fused to metal copings using recently developed die materials. AIM: To detect the influence of margin geometries and dimensional accuracy of contemporary die materials on vertical marginal gaps in Porcelain fused to metal coping using a Stereomicroscope (three dimensional analysis). MATERIALS AND METHOD: Two chrome cobalt alloy models of mandibular first molars prepared to have shoulder and deep chamfer finish lines were CAD-CAM milled...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28268728/a-pressure-and-shear-sensing-liner-for-prosthetic-sockets
#10
Jason Wheeler, Anirban Mazumdar, Lisa Marron, Kevin Dullea, Joan Sanders, Kate Allyn
Interface pressures are closely related to the comfort and fit of a lower-limb prosthetic socket and clinicians and researchers are interested in monitoring these loads. In particular, shear stresses at the socket/liner interface are indicative of important fit characteristics but are difficult to measure in situ. We have developed an elastomeric liner with sixteen integrated pressure and shear sensors, along with necessary wiring and data acquisition electronics. The sensors measure three-axis pressures using optical emitter/detector pairs coupled with transparent and opaque elastomeric layers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28263544/smart-actuators-and-adhesives-for-reconfigurable-matter
#11
Hyunhyub Ko, Ali Javey
Biological systems found in nature provide excellent stimuli-responsive functions. The camouflage adaptation of cephalopods (octopus, cuttlefish), rapid stiffness change of sea cucumbers, opening of pine cones in response to humidity, and rapid closure of Venus flytraps upon insect touch are some examples of nature's smart systems. Although current technologies are still premature to mimic these sophisticated structures and functions in smart biological systems, recent work on stimuli-responsive programmable matter has shown great progress...
March 6, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28262992/controlled-3d-assembly-of-graphene-sheets-to-build-conductive-chemically-selective-and-shape-responsive-materials
#12
Steven J Woltornist, Deepthi Varghese, Daniel Massucci, Zhen Cao, Andrey V Dobrynin, Douglas H Adamson
Driven by the surface activity of graphene, electrically conductive elastomeric foams have been synthesized by the controlled reassembly of graphene sheets; from their initial stacked morphology, as found in graphite, to a percolating network of exfoliated sheets, defining hollow spheres. This network creates a template for the formation of composite foams, whose swelling behavior is sensitive to the composition of the solvent, and whose electrical resistance is sensitive to physical deformation. The self-assembly of graphene sheets is driven thermodynamically, as graphite is found to act as a 2D surfactant and is spread at high-energy interfaces...
March 6, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28253994/in-situ-heart-valve-tissue-engineering-using-a-bioresorbable-elastomeric-implant-from-material-design-to-12-months-follow-up-in-sheep
#13
Jolanda Kluin, Hanna Talacua, Anthal I P M Smits, Maximilian Y Emmert, Marieke C P Brugmans, Emanuela S Fioretta, Petra E Dijkman, Serge H M Söntjens, Renée Duijvelshoff, Sylvia Dekker, Marloes W J T Janssen-van den Broek, Valentina Lintas, Aryan Vink, Simon P Hoerstrup, Henk M Janssen, Patricia Y W Dankers, Frank P T Baaijens, Carlijn V C Bouten
The creation of a living heart valve is a much-wanted alternative for current valve prostheses that suffer from limited durability and thromboembolic complications. Current strategies to create such valves, however, require the use of cells for in vitro culture, or decellularized human- or animal-derived donor tissue for in situ engineering. Here, we propose and demonstrate proof-of-concept of in situ heart valve tissue engineering using a synthetic approach, in which a cell-free, slow degrading elastomeric valvular implant is populated by endogenous cells to form new valvular tissue inside the heart...
May 2017: Biomaterials
https://www.readbyqxmd.com/read/28250097/grasping-with-a-soft-glove-intrinsic-impedance-control-in-pneumatic-actuators
#14
P Paoletti, G W Jones, L Mahadevan
The interaction of a robotic manipulator with unknown soft objects represents a significant challenge for traditional robotic platforms because of the difficulty in controlling the grasping force between a soft object and a stiff manipulator. Soft robotic actuators inspired by elephant trunks, octopus limbs and muscular hydrostats are suggestive of ways to overcome this fundamental difficulty. In particular, the large intrinsic compliance of soft manipulators such as 'pneu-nets'-pneumatically actuated elastomeric structures-makes them ideal for applications that require interactions with an uncertain mechanical and geometrical environment...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28246503/ultrasonographic-evaluation-of-periodontal-changes-during-orthodontic-tooth-movement-work-in-progress
#15
Adela Zimbran, Diana Dudea, Cristina Gasparik, Sorin Dudea
BACKGROUND AND AIM: Orthodontic tooth movement (OTM) is a process whereby the application of a force induces bone resorption on the pressure side and bone apposition on the tension side of the lamina dura. However, only limited data are available on the in vivo behavior of the periodontal tissues. The aim of this study was to assess the changes of periodontal tissues, induced by the orthodontic canine retraction, using 40 MHz ultrasonography. METHODS: Ultrasonographic evaluation of periodontal tissues was conducted in 5 patients with indication for orthodontic treatment...
2017: Clujul Medical (1957)
https://www.readbyqxmd.com/read/28226916/a-pressure-and-shear-sensing-liner-for-prosthetic-sockets
#16
Jason Wheeler, Anirban Mazumdar, Lisa Marron, Kevin Dullea, Joan Sanders, Kate Allyn, Jason Wheeler, Anirban Mazumdar, Lisa Marron, Kevin Dullea, Joan Sanders, Kate Allyn, Kevin Dullea, Joan Sanders, Kate Allyn, Anirban Mazumdar, Lisa Marron, Jason Wheeler
Interface pressures are closely related to the comfort and fit of a lower-limb prosthetic socket and clinicians and researchers are interested in monitoring these loads. In particular, shear stresses at the socket/liner interface are indicative of important fit characteristics but are difficult to measure in situ. We have developed an elastomeric liner with sixteen integrated pressure and shear sensors, along with necessary wiring and data acquisition electronics. The sensors measure three-axis pressures using optical emitter/detector pairs coupled with transparent and opaque elastomeric layers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222597/mechanochemical-kinetics-in-elastomeric-polymer-networks-heterogeneity-of-local-forces-results-in-nonexponential-kinetics
#17
Ramesh Adhikari, Dmitrii E Makarov
A common approach to inducing selective mechanochemical transformations relies on embedding the target molecules (called mechanophores) within elastomeric polymer networks. Mechanical properties of such elastomers can also be modulated through the mechanochemical response of the constituent polymer chains. The inherent randomness in the molecular structure of such materials leads to heterogeneity of the local forces exerted on individual mechanophores. Here we use coarse-grained simulations to study the force distributions within random elastomeric networks and show that those distributions are close to exponential regardless of the applied macroscopic load, entanglement effects, or network parameters...
March 7, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28208993/preliminary-sem-observations-on-the-surface-of-elastomeric-impression-materials-after-immersion-or-ozone-disinfection
#18
Nikolas Poulis, Anthony Prombonas, Stavros Yannikakis, Thanasis Karampotsos, Martha-Spyridoula Katsarou, Nikolaos Drakoulis
INTRODUCTION: Surface integrity of dental elastomeric impression materials that are subjected to disinfection is of major importance for the quality of the final prosthetic restorations. AIM: The aim of this qualitative Scanning Electronic Microscopy (SEM) study was to reveal the effects of immersion or ozone disinfection on the surface of four dental elastomeric impression materials. MATERIALS AND METHODS: Four dental elastomeric impression material brands were used (two vinyl polysiloxane silicones, one polyether, and one vinyl polyether silicone)...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28198812/highly-stretchable-and-shape-controllable-three-dimensional-antenna-fabricated-by-cut-transfer-release-method
#19
Zhuocheng Yan, Taisong Pan, Guang Yao, Feiyi Liao, Zhenlong Huang, Hulin Zhang, Min Gao, Yin Zhang, Yuan Lin
Recent progresses on the Kirigami-inspired method provide a new idea to assemble three-dimensional (3D) functional structures with conventional materials by releasing the prestrained elastomeric substrates. In this paper, highly stretchable serpentine-like antenna is fabricated by a simple and quick "Cut-Transfer-Release" method for assembling stretchable 3D functional structures on an elastomeric substrate with a controlled shape. The mechanical reliability of the serpentine-like 3D stretchable antenna is evaluated by the finite element method and experiments...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28195075/stretchable-array-of-metal-nanodisks-on-a-3d-sinusoidal-wavy-elastomeric-substrate-for-frequency-tunable-plasmonics
#20
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
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