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flexibility and strength

Jose M González-Domínguez, Verónica León, María Isabel Lucío, Maurizio Prato, Ester Vázquez
Graphene has promising physical and chemical properties such as high strength and flexibility, coupled with high electrical and thermal conductivities. It is therefore being incorporated into polymer-based composites for use in electronics and photonics applications. A main constraint related to the graphene development is that, being of a strongly hydrophobic nature, almost all dispersions (usually required for its handling and processing toward the desired application) are prepared in poisonous organic solvents such as N-methyl pyrrolidone or N,N-dimethyl formamide...
March 2018: Nature Protocols
Qiheng Tang, Lu Fang, YunFei Wang, Miao Zou, Wenjing Guo
Flexible transparent conductive films or substrates prepared from plastics or cellulose are widely used in optoelectronic devices. However, all of these films or substrates are fabricated by complex and expensive methods, which consume much energy and time. In this work, we report for the first time a remarkably facile and effective approach for fabricating flexible transparent films directly from wood. The resulting films exhibit an array of exceptional optical and mechanical properties. The well-aligned cell structures in natural wood are maintained during delignification, leading to anisotropic films with high transparency (≈90% transmittance)...
February 15, 2018: Nanoscale
Bhagabat Bhuyan, Suneel Kumar Srivastava, Vikas Mittal
MWCNTs/hectorite 3D hybrid filler was prepared from the 1:1 combination by weight of constituent MWCNTs (1D) and hectorite (2D) through simple dry grinding method. The resulting hybrid filler was subsequently utilized for the preparation of Ethylene-co-vinyl acetate (EVA)/MWCNTs/hectorite nanocomposites by solution intercalation method. Transmission electron microscopy and X-ray diffraction studies of the nanocomposites confirm homogeneous dispersion of the fillers in the polymer matrix. Mechanical, thermal and dielectric properties of neat EVA are significantly enhanced with increase in filler content...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Talysa Klein, Benjamin G Lee, Manuel Schnabel, Emily L Warren, Paul Stradins, Adele Tamboli, Maikel F A M van Hest
Transparent conductive adhesives (TCAs) can enable conductivity between two substrates, which is useful for a wide range of electronic devices. Here we have developed a TCA composed of polymer-particle blend with Ethylene-Vinyl Acetate as the transparent adhesive and metal-coated flexible Poly(Methyl Methacrylate) microspheres as the conductive particles that can provide conductivity and adhesion regardless of surface texture. This TCA layer was designed to be nearly transparent, conductive in only the out of plane direction, and of practical adhesive strength to hold substrates together...
February 14, 2018: ACS Applied Materials & Interfaces
Hao Hu, Pablo Sampedro Ruiz, Ran Ni
Grafting linkers with open ends of complementary single-stranded DNA makes a flexible tool to tune interactions between colloids, which facilitates the design of complex self-assembly structures. Recently, it has been proposed to coat colloids with mobile DNA linkers, which alleviates kinetic barriers without high-density grafting, and also allows the design of valency without patches. However, the self-assembly mechanism of this novel system is poorly understood. Using a combination of theory and simulation, we obtain phase diagrams for the system in both two and three dimensional spaces, and find stable floppy square and CsCl crystals when the binding strength is strong, even in the infinite binding strength limit...
January 26, 2018: Physical Review Letters
Natália Boneti Moreira, Gabriele Gonçalves, Talihina da Silva, Francisco Ernesto Halila Zanardini, Paulo Cesar Barauce Bento
AIM: The aim of this study was to verify the effects of a multisensory exercise programme on the cognition and functionality of institutionalized older adults. METHODS: Forty-five volunteers were randomly allocated to 2 groups, the multisensory exercise programme (n = 24) and the control group that received no treatment (n = 21). The programme consisted of 3 50-min sessions of progressive exercises per week for 16 weeks that challenged their strength, balance, coordination, multisensory stimulation, and flexibility in different tasks...
February 13, 2018: Physiotherapy Research International: the Journal for Researchers and Clinicians in Physical Therapy
Nishar Hameed, Ludovic F Dumée, Francois-Marie Allioux, Mojdeh Reghat, Jeffrey S Church, Minoo Naebe, Kevin Magniez, Jyotishkumar Parameswaranpillai, Bronwyn L Fox
Graphene based room temperature flexible nanocomposites were prepared using epoxy thermosets for the first time. Flexible behavior was induced into the epoxy thermosets by introducing charge transfer complexes between functional groups within cross linked epoxy and room temperature ionic liquid ions. The graphene nanoplatelets were found to be highly dispersed in the epoxy matrix due to ionic liquid cation-π interactions. It was observed that incorporation of small amounts of graphene into the epoxy matrix significantly enhanced the mechanical properties of the epoxy...
February 12, 2018: Scientific Reports
Bade Tonyali, Sevil Cikrikci, Mecit Halil Oztop
Edible films of gum tragacanth (GT) with whey protein were fabricated to see how the incorporation of GT influenced whey protein based film properties. Whey protein isolate (WPI) was replaced with GT at different ratios as 0.5, 1, 1.5 and 2% of WPI. Optical, mechanical, permeability and microstructural properties, as well as moisture sorption and solubility behavior of films were measured. The findings indicated that combination of WPI and GT in film formulation led to less strength, more flexible, less soluble films with lower permeability to water and with higher opacity...
March 2018: Food Research International
Nicole B Fritz, Álvaro Juesas, Pedro Gargallo, Joaquín Calatayud, Julio Fernández-Garrido, Michael E Rogers, Juan C Colado
The aim of this study was to investigate the effects of a resistance training program (RTP) in older overweight women (OOW) using two different types of elastic devices. METHODS: This study was a randomized controlled trial with pre- and postintervention measures. Participants included OOW, aged 60-85 years, with no medical history of disease that would preclude them from engaging in physical exercise. Participants were randomly divided into the following groups: elastic tubes with handles group (ETG; n = 22), traditional elastic bands group ( n = 21), and control group (CG; n = 20)...
January 1, 2018: Biological Research for Nursing
K S L Mileski, M Bottaro, L G Grossi-Porto, A Lofrano-Porto
Congenital hypogonadotropic hypogonadism is a rare disorder characterised by impaired testosterone secretion since birth, and represents a valuable model for studying the effects of testosterone replacement therapy (TRT) in humans. This cross-sectional study aimed to investigate all health-related physical fitness (HRPF) components and quality of life in a series of eight men with hypogonadotropic hypogonadism under regular TRT. The study group was compared to a control group of 16 healthy subjects paired for age, body mass index and physical activity...
February 11, 2018: Andrologia
Josianne Rodrigues-Krause, Mauricio Krause, Alvaro Reischak-Oliveira
Context • Dancing has been used as a form of exercise to improve functional and metabolic outcomes during aging. The field lacks randomized, clinical trials (RCTs) evaluating metabolic outcomes related to dance interventions, but dancing may be a form of exercise that could induce positive effects on the metabolic health of older adults. However, primary studies seem very heterogonous regarding the trial designs, characteristics of the interventions, the methods for outcomes assessments, statistical powers, and methodological quality...
February 10, 2018: Alternative Therapies in Health and Medicine
Julia Hock, Barbara Reiner, Rhoia C Neidenbach, Renate Oberhoffer, Alfred Hager, Peter Ewert, Jan Müller
OBJECTIVE: Children and adolescents with an univentricular heart after total cavopulmonary connection (TCPC) have functional impairments. This study assesses health-related physical fitness (HRPF) and exercise capacity, as well as their relation to health-related quality of life (HRQoL) in patients with an univentricular heart after total-pulmonary connection (TCPC). PATIENTS AND METHODS: Between July 2014 and October 2016 a total of 78 children and adolescents with TCPC (12...
March 15, 2018: International Journal of Cardiology
Asif Ahmed, Joshua Boateng
AIM: Diabetic foot ulcers are susceptible to infection and nonmedicated dressings are ineffective because they have no antimicrobial activity. This study aimed to develop antimicrobial films to deliver ciprofloxacin for treating bacterial infection. Results/methodology: Ciprofloxacin-loaded calcium alginate films were characterized for porosity, swelling, equilibrium water content, water absorption, water vapor transmission, evaporative water loss, moisture content, mechanical strength, adhesion, IR spectroscopy, scanning electron microscopy, x-ray diffraction, drug release, cytotoxicity and antimicrobial activity against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa...
February 1, 2018: Therapeutic Delivery
Asadullah Madni, Sobia Noreen, Irsah Maqbool, Faizza Rehman, Amna Batool, Prince Muhammad Kashif, Mubashar Rehman, Nayab Tahir, Muhammad Imran Khan
Graphene, the mother of all carbon materials has unlocked a new era of biomedical nanomaterials due to its exceptional biocompatibility, physicochemical and mechanical properties. It is a single atom thick, nanosized, 2-dimensional structure and provides high surface area with adjustable surface chemistry to form hybrids. The present article provides a comprehensive review of ever-expanding application of graphene nanomaterials with different inorganic and organic materials in drug delivery and theranostics...
February 9, 2018: Journal of Drug Targeting
Jie Zeng, Xixi Ji, Yihui Ma, Zhongxing Zhang, Shuguang Wang, Zhonghua Ren, Chunyi Zhi, Jie Yu
3D assembly of graphene sheets (GSs) is important for preserving the merits of the single-atomic-layered structure. Simultaneously, vertical growth of GSs has long been a challenge for thermal chemical vapor deposition (CVD). Here, vertical growth of the GSs is achieved in a thermal CVD reactor and a novel 3D graphene structure, 3D graphene fibers (3DGFs), is developed. The 3DGFs are prepared by carbonizing electrospun polyacrylonitrile fibers in NH3 and subsequently in situ growing the radially oriented GSs using thermal CVD...
February 9, 2018: Advanced Materials
Sara Olenich, Graeme Waterworth, Gary J Badger, Bruce Levy, Elliot Israel, Helene M Langevin
OBJECTIVE: Although less is known about musculoskeletal factors that may contribute to asthma symptoms, body-based treatments addressing movement restrictions of the chest and shoulders may be a useful adjunct to asthma pharmacotherapy. In this pilot study, we compared asthma symptoms, pulmonary function tests, and medication use before and after a course of resistance flexibility and strength training (RFST) treatments in human subjects with asthma. METHODS: Patients with asthma (n = 10; mean age 23 years) completed questionnaires (Asthma Control Questionnaire (ACQ), Asthma Quality of Life Questionnaire (AQLQ), Asthma Control Test (ACT)), spirometry, chest wall excursion, and shoulder range of motion (ROM) before and after a series of four RFST treatments over 47 ± 21 days...
February 8, 2018: Journal of Asthma: Official Journal of the Association for the Care of Asthma
Jingxia Huang, Jinqing Wang, Zhigang Yang, Shengrong Yang
The bulk materials of three-dimensional graphene (3DG) with high network structure and excellent electrical conductivity have many potential applications in flexible electronics, but the network structure is not very stabledue to weak bonding between graphene sheets. Here, a polyimide (PI) layer was introduced on the as-prepared 3DG sponge by vacuum infiltration-curing method.The resulting 3DG/PI composite sponges with robust 3D network structure exhibited excellent electrical conductivity (3.7 S/cm), compression strength (175 kPa), elasticity and flexibility, as well as the outstanding compression sensitivity to resistance and stable piezo-resistance effect; namely, they possessa large change of resistance in response to application of small strain and low density, while the resistance change remains favorably stable after performing 300 times of compress-release cycling, which means that the prepared composite sponges can find wide applications in pressure sensing or stimulus-responsive graphene system...
February 8, 2018: ACS Applied Materials & Interfaces
Robson Sean, Lytell Maria C, Sims Carra S, Pezard Stephanie, Manacapilli Thomas, Anderson Amanda, Bohusch Therese, Haddad Abigail
Military occupations can be physically demanding, yet few attempts have been made to determine the physical readiness of today's airmen to perform their jobs. Although the Air Force conducts fitness testing of all its airmen, these tests and standards are not based on validated job requirements. As part of a broader Air Force effort to measure the physical readiness of airmen to perform their jobs, this study describes a methodology for establishing physical fitness standards for four physically demanding Air Force occupational specialties-combat controller, pararescue, special operations weather team, and tactical air control party...
January 2018: Rand Health Quarterly
Kai Hwang, James M Shine, Mark D'Esposito
Flexible interactions between brain regions enable neural systems to adaptively transfer and process information. However, the neural substrates that regulate adaptive communications between brain regions are understudied. In this human fMRI study, we investigated this issue by tracking time-varying, task-evoked changes in functional connectivity between localized occipitotemporal regions while participants performed different tasks on the same visually presented stimuli. We found that functional connectivity between ventral temporal and the primary visual regions selectively increased during the processing of task-relevant information...
February 3, 2018: Cerebral Cortex
Maximilian Scheurer, Peter Rodenkirch, Marc Siggel, Rafael C Bernardi, Klaus Schulten, Emad Tajkhorshid, Till Rudack
Molecular dynamics (MD) simulations have become ubiquitous in all areas of life sciences. The size and model complexity of MD simulations are rapidly growing along with increasing computing power and improved algorithms. This growth has led to the production of a large amount of simulation data that need to be filtered for relevant information to address specific biomedical and biochemical questions. One of the most relevant molecular properties that can be investigated by all-atom MD simulations is the time-dependent evolution of the complex noncovalent interaction networks governing such fundamental aspects as molecular recognition, binding strength, and mechanical and structural stability...
February 6, 2018: Biophysical Journal
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