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https://www.readbyqxmd.com/read/28821108/modified-bacterial-cellulose-based-self-healable-polyeloctrolyte-film-for-wound-dressing-application
#1
Moumita Khamrai, Sovan Lal Banerjee, Patit P Kundu
In this investigation, we prepare a self-healable polyelectrolyte film via crosslinking the cationically charged chitosan (Cts) with anionically modified bacterial cellulose (BC), which is a green source of nano-filler. This polyelectrolyte film is able to show dynamic self-healing activity at physiological pH condition via adapting ionic interaction, a state of non-covalent bond. BC was prepared using Glucanoacetobacter xylinus (MTCC7795) bacteria and after that its surface was modified with anionic poly(acrylic acid) using "grafting from" technique...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820573/magnetically-aligned-co-c-mwcnts-composite-derived-from-mwcnts-interconnected-zeolitic-imidazolate-frameworks-for-lightweight-and-highly-efficient-electromagnetic-wave-absorber
#2
Yichao Yin, Xiaofang Liu, Xiaojun Wei, Ya Li, Xiaoyu Nie, Ronghai Yu, Jianglan Shui
Developing lightweight and highly efficient electromagnetic wave (EMW) absorbing materials is crucial but challenging for anti-electromagnetic irradiation and interference. Herein, we used MWCNTs as templates for growth of Co-based zeolitic imidazolate frameworks (ZIFs), and obtained Co-C/MWCNTs composite by post pyrolysis. The MWCNTs interconnected the ZIF-derived Co-C porous particles, constructing a conductive network for electron hopping and migration. Moreover, the Co-C/MWCNTs composite was aligned in paraffin matrix under an external magnetic field, which led to the stretch of MWCNTs along the magnetic field direction...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28818692/suppression-of-irrelevant-sounds-during-auditory-working-memory
#3
Jyrki Ahveninen, Larry J Seidman, Wei-Tang Chang, Matti Hämäläinen, Samantha Huang
Auditory working memory (WM) processing in everyday acoustic environments depends on our ability to maintain relevant information online in our minds, and to suppress interference caused by competing incoming stimuli. A challenge in communication settings is that the relevant content and irrelevant inputs may emanate from a common source, such as a talkative conversationalist. An open question is how the WM system deals with such interference. Will the distracters become inadvertently filtered before processing for meaning because the primary WM operations deplete all available processing resources? Or are they suppressed post perceptually, through an active control process? We tested these alternative hypotheses by measuring magnetoencephalography (MEG), EEG, and functional MRI (fMRI) during a phonetic auditory continuous performance task...
August 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28818520/owlready-ontology-oriented-programming-in-python-with-automatic-classification-and-high-level-constructs-for-biomedical-ontologies
#4
Jean-Baptiste Lamy
OBJECTIVE: Ontologies are widely used in the biomedical domain. While many tools exist for the edition, alignment or evaluation of ontologies, few solutions have been proposed for ontology programming interface, i.e. for accessing and modifying an ontology within a programming language. Existing query languages (such as SPARQL) and APIs (such as OWLAPI) are not as easy-to-use as object programming languages are. Moreover, they provide few solutions to difficulties encountered with biomedical ontologies...
August 14, 2017: Artificial Intelligence in Medicine
https://www.readbyqxmd.com/read/28814892/treatment-of-a-traumatic-atrophic-depressed-scar-with-hyaluronic-acid-fillers-a-case-report
#5
Syed Nazim Hussain, Greg J Goodman, Eqram Rahman
BACKGROUND: Hyaluronic acid filler has been documented in the treatment of atrophic depressed acne scars relatively frequently in the literature but rarely in chronic depressed traumatic atrophic facial scars. METHODS: This case report discusses the use of hyaluronic acid fillers in the correction of a post-traumatic facial atrophic scar on the right cheek. RESULTS: The right cheek scar was substantially corrected with one session of two different hyaluronic acids injected in a deep and superficial plane...
2017: Clinical, Cosmetic and Investigational Dermatology
https://www.readbyqxmd.com/read/28812342/achieving-a-collapsible-strong-and-highly-thermally-conductive-film-based-on-oriented-functionalized-boron-nitride-nanosheets-and-cellulose-nanofiber
#6
Kai Wu, Jinchao Fang, Jinrui Ma, Rui Huang, Songgang Chai, Feng Chen, Qiang Fu
Boron nitride nanosheets (BNNS) film receives wide attention in both academia and industry due to its high thermal conductivity (TC) and good electrical insulation capability. However, the brittleness and low strength of BNNS film largely limit its application. Herein, functionalized BNNS (f-BNNS) with well-maintained in-plane crystalline structure was firstly prepared utilizing urea in the aqueous solution via ball-milling for the purpose of improving its stability in water and enhancing the interaction with polymer matrix...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28807329/impact-of-thio-urethane-additive-and-filler-type-on-light-transmission-and-depth-of-polymerization-of-dental-composites
#7
André Luis Faria-E-Silva, Carmem Silvia Pfeifer
OBJECTIVE: This study evaluated the effects of filler type and the addition of thio-urethane oligomers on light-transmission, polymerization kinetics and depth of cure of resin composites. METHODS: BisGMA:UDMA:TEGMA (5:3:2wt%) were mixed with 0 (control) or 20wt% thio-urethane. Fillers with various sizes and refractive indices were included and refractive index (RI) measured. Unfilled resins were used as controls. The RIs of materials were measured before and after polymerization...
August 11, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28804933/chemical-functionalization-of-polysaccharides-towards-biocompatible-hydrogels-for-biomedical-applications
#8
Andreas Kirschning, Gerald Dräger, Nick Dibbert
Hydrogels have emerged as a highly interdisciplinary topic as they play a significant role for a vast number of applications. They have been studied extensively as materials for contact lenses, wound dressing and as filler material in soft-tissue augmentation, in which classical polymer backbones such as hydroxyethylmethacrylate (HEMA) are typically employed. More recently, polysaccharides have received attention, particularly in the fields of regenerative medicine and tissue engineering, as ideal candidate materials for artificial extracellular matrices (ECM)...
August 13, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28803246/biofunctional-ionic-doped-calcium-phosphates-silk-fibroin-composites-for-bone-tissue-engineering-scaffolding
#9
S Pina, R F Canadas, G Jiménez, M Perán, J A Marchal, R L Reis, J M Oliveira
The treatment and regeneration of bone defects caused by traumatism or diseases have not been completely addressed by current therapies. Lately, advanced tools and technologies have been successfully developed for bone tissue regeneration. Functional scaffolding materials such as biopolymers and bioresorbable fillers have gained particular attention, owing to their ability to promote cell adhesion, proliferation, and extracellular matrix production, which promote new bone growth. Here, we present novel biofunctional scaffolds for bone regeneration composed of silk fibroin (SF) and β-tricalcium phosphate (β-TCP) and incorporating Sr, Zn, and Mn, which were successfully developed using salt-leaching followed by a freeze-drying technique...
August 12, 2017: Cells, Tissues, Organs
https://www.readbyqxmd.com/read/28802737/multi-biofunctional-polymer-graphene-composite-for-bone-tissue-regeneration-that-elutes-copper-ions-to-impart-angiogenic-osteogenic-and-bactericidal-properties
#10
L R Jaidev, Sachin Kumar, Kaushik Chatterjee
Despite several recent advances, poor vascularization in implanted scaffolds impedes complete regeneration for clinical success of bone tissue engineering. The present study aims to develop a multi-biofunctional nanocomposite for bone tissue regeneration using copper nanoparticle decorated reduced graphene oxide (RGO_Cu) hybrid particles in polycaprolactone (PCL) matrix (PCL/RGO_Cu). X-ray photoelectron spectroscopy and X-ray diffraction confirmed the presence of copper oxides (CuO and Cu2O) on RGO. Thermogravimetric analysis showed that 11...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28801685/investigation-on-ti6al4v-v-cr-fe-ss316-multi-layers-metallic-structure-fabricated-by-laser-3d-printing
#11
Wei Li, Frank Liou, Joseph Newkirk, Karen M Brown Taminger, William J Seufzer
Joining titanium alloy and stainless steel is becoming an urgent need since their outstanding mechanical properties can be utilized integratedly. However, direct fusion joining of Ti6Al4V to SS316 can cause brittle Ti-Fe intermetallics which compromise join bonds' mechanical properties. In this research, Laser 3D Printing was applied to explore a new Ti6Al4V to SS316 multi-metallic structure. A novel filler transition route was introduced (Ti6Al4V → V → Cr → Fe → SS316) to avoid the Ti-Fe intermetallics...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800109/effects-of-zno-nanoparticle-on-the-gas-separation-performance-of-polyurethane-mixed-matrix-membrane
#12
Banafsheh Soltani, Morteza Asghari
Polyurethane (PU)-ZnO mixed matrix membranes (MMM) were fabricated and characterized for gas separation. A thermogravimetric analysis (TGA), a scanning electron microscope (SEM) test and an atomic-force microscopy (AFM) revealed that the physical properties and thermal stability of the membranes were improved through filler loading. Hydrogen Bonding Index, obtained from the Fourier transform infrared spectroscopy (FTIR), demonstrate that the degree of phase separation in PU-ZnO 0.5 wt % MMM was more than the neat PU, while in PU-ZnO 1...
August 11, 2017: Membranes
https://www.readbyqxmd.com/read/28797746/synthesis-of-wrinkled-mesoporous-silica-and-its-reinforcing-effect-for-dental-resin-composites
#13
Ruili Wang, Eric Habib, X X Zhu
OBJECTIVE: The aim of this work is to explore the reinforcing effect of wrinkled mesoporous silica (WMS), which should allow micromechanical resin matrix/filler interlocking in dental resin composites, and to investigate the effect of silica morphology, loading, and compositions on their mechanical properties. METHODS: WMS (average diameter of 496nm) was prepared through the self-assembly method and characterized by the use of the electron microscopy, dynamic light scattering, and the N2 adsorption-desorption measurements...
August 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28794493/structural-and-thermal-stability-of-polycarbonate-decorated-fumed-silica-nanocomposite-via-thermomechanical-analysis-and-in-situ-temperature-assisted-saxs
#14
Ramdayal Yadav, Minoo Naebe, Xungai Wang, Balasubramanian Kandasubramanian
The inorganic and organic nanocomposites have enticed wide interest in the field of polymer-based composite systems to augment their physiochemical properties like mechanical strength and electrical conductivity. Achieving interfacial interaction between inorganic filler and polymer matrix is a recurring challenge, which has significant implications for mechanical properties of nanocomposites. In this context, the effect of "interfacial zone" on structural and thermal attributes of the melt blended pristine polycarbonate and polycarbonate (PC) decorated fumed silica nanocomposite have been examined from ambient temperature to the glass transition temperature...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28792204/poly-vinylidene-fluoride-flexible-nanocomposite-films-with-dopamine-coated-giant-dielectric-ceramic-nanopowders-ba-fe0-5ta0-5-o3-for-high-energy-storage-density-at-low-electric-field
#15
Zhuo Wang, Tian Wang, Chun Wang, Yujia Xiao, Panpan Jing, Yongfei Cui, Yongping Pu
Ba(Fe0.5Ta0.5)O3/poly(vinylidene fluoride) (BFT/PVDF) flexible nanocomposite films are fabricated by tape-casting using dopamine (DA) modified BFT nanopowders and PVDF as matrix polymer. After surface modification by DA layer with a thickness of 5 nm, the interfacial couple interaction between BFT and PVDF is enhanced, resulting in less hole defects at the interface. Then the dielectric constant ('), loss tangent (tan δ) and AC conductivity of nanocomposite films are reduced. Meanwhile, the value of reduced dielectric constant (Δ') and strength of interfacial polarization (k) is introduced to illustrate the effect of DA on dielectric behavior of nanocomposite films...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28792203/significant-enhancement-of-thermal-conductivity-in-polymer-composite-via-constructing-macroscopic-segregated-filler-networks
#16
Hongju Zhou, Hua Deng, Li Zhang, Qiang Fu
The low efficiency of thermal conductive filler is an unresolved issue for the preparation of high performance thermal conductive polymer composites. Although it is known that minimizing the interfacial scattering of phonons or electrons is the key for thermal conductivity, the enhancement is generally limited by preparation methods that can yield the ideal morphology and interfaces. Herein, low temperature expandable graphite (LTEG) is added into a commercial impact modifier (Elvaloy®4170), which is then coated onto poly(butylene terephthalate) (PBT) particles with various sizes at millimeter scale between their melting temperatures...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28792201/mechanical-synthesis-of-cof-nanosheet-cluster-and-its-mixed-matrix-membrane-for-efficient-co2-removal
#17
Changchang Zou, Qianqian Li, Yinying Hua, Bihang Zhou, Jingui Duan, Wanqin Jin
Covalent organic framework (COF) membranes used to selective removal of CO2 was believed as an efficient and low-cost solution to energy and environmental sustainability. In this study, the amide modified COF nanosheet cluster with 2D structure was facilely prepared through solid reaction, exhibiting good adsorption-based CO2 selectivity (223 at 273K and 90 at 298K) towards N2. Remarkably, the mixed matrix membrane (MMM) that consist of less amount of COF filler (1wt%) shows promising CO2/N2 gas selectivity (64)...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28782936/sulfonated-copper-phthalocyanine-sulfonated-polysulfone-composite-membrane-for-ionic-polymer-actuators-with-high-power-density-and-fast-response-time
#18
Taehoon Kwon, Hyeongrae Cho, Jang-Woo Lee, Dirk Henkensmeier, Youngjong Kang, Chong Min Koo
Ionic polymer composite membranes based on sulfonated poly(arylene ether sulfone) (SPAES) and copper(II) phthalocyanine tetrasulfonic acid (CuPCSA) are assembled into bending ionic polymer actuators. CuPCSA is an organic filler with very high sulfonation degree (IEC = 4.5 mmol H(+)/g) that can be homogeneously dispersed on the molecular scale into the SPAES membrane, probably due to its good dispersibility in SPAES-containing solutions. SPAES/CuPCSA actuators exhibit larger ion conductivity (102 mS cm(-1)), tensile modulus (208 MPa), strength (101 MPa), and strain (1...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28782360/self-healing-natural-rubber-with-tailorable-mechanical-properties-based-on-ionic-supramolecular-hybrid-network
#19
Chuanhui Xu, Liming Cao, Xunhui Huang, Yukun Chen, Baofeng Lin, Lihua Fu
In most cases, the strength of self-healing supramolecular rubber based on non-covalent bonds is in the order of KPa, which is a challenge for their further applications. Incorporation of conventional fillers can effectively enhance the strength of rubbers, but usually accompanied by a sacrifice of self-healing capability due to that the filler system is independent of the reversible supramolecular network. In the present work, in-situ reaction of methacrylic acid (MAA) and excess zinc oxide (ZnO) was realized in natural rubber (NR)...
August 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28782069/dislocation-assisted-crack-healing-in-h-bn-nanosheets
#20
Rajesh Kumar, Avinash Parashar
Large size h-BN nanosheets are usually polycrystalline in nature and contain different types of grain boundaries. The low angle grain boundaries are usually referred as dislocations. The interaction of dislocations with the defects present in materials may affect the properties of materials. The aim of the current atomistic simulations was to study the effects of 5|7 dislocations on the mode-I fracture toughness of h-BN nanosheets. Molecular dynamics-based simulations were performed with different sets of geometrical configurations of dislocations in conjunction with centrally embedded cracks in h-BN nanosheets...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
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