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Xiaoxiong Wang, Wei-Zhi Song, Ming-Hao You, Jun Zhang, Miao Yu, Zhiyong Fan, Seeram Ramakrishna, Yun-Ze Long
Moravec's paradox shows that low-level sensorimotor skills are more difficult than high-level reasoning in artificial intelligence and robotics area. So simplifying every sensing unit on electronic skin is critical for endowing intelligent robots with tactile and temperature sense. The human nervous system is characterized by efficient single-electrode signal transmission, ensuring the efficiency and reliability of information transmission under big data conditions. In this work, we report a sensor based on single-electrode piezoelectric nanogenerator (SPENG) by electrospun polyvinylidene fluoride(PVDF) nanofibers that can realize steady state sensing of pressure integrating cold/heat sensing on a single unit...
August 13, 2018: ACS Nano
Xiaobin Yang, Hongguang Sun, Avishek Pal, Yongping Bai, Lu Shao
The worldwide water crisis and water pollution has put forward great challenges to the current membrane technology. Although polyvinylidene fluoride (PVDF) porous membranes can find diverse applications for water treatments, the inherent hydrophilicity must be tuned for energy/time-saving process. Herein, the surface wettability of PVDF membranes transforming from highly hydrophobicity to highly hydrophilicity was realized via one-step reaction of plant-derived phenol gallic acid (GA) and γ-aminopropyltriethoxysilane (APTES) under aqueous solutions...
August 9, 2018: ACS Applied Materials & Interfaces
Yunchuan Xie, Wanrong Jiang, Tao Fu, Jingjing Liu, Zhicheng Zhang, Shengnan Wang
Poor compatibility of polymer/ceramic composites used as high-pulse capacitors with high permittivity suffers from the reduced breakdown strength (Eb) and lowered energy density (Ue). Herein, mussels-inspired poly(dopamine) (PDA) modified BaSrTiO3 nanoparticle (mBST) and PVDF matrix are bonded together to fabricate nanocomposites with crosslinked 3D network and enhanced compatibility. The significantly improved Eb of 466 MV/m and the highest Ue of 11.0 J/cm3 for PVDF-based polymer/BST composites have been obtained...
August 8, 2018: ACS Applied Materials & Interfaces
Vered H Eisenberg, Geertje Callewaert, Nikhil Sindhwani, Susanne Housmans, Dominique van Schoubroeck, Lior Lowenstein, Jan Deprest
INTRODUCTION AND HYPOTHESIS: Paramagnetic Fe particles can be added during synthetic mesh production to allow visibility on magnetic resonance imaging. Our aim was to evaluate whether transperineal ultrasound (TPUS) allows visualization, measurement, and characterization of polyvinylidene fluoride (PVDF mesh) containing Fe particles compared with regular polypropylene (PP) meshes used for sacrocolpopexy. METHODS: Women up to 1.5 years after laparoscopic sacrocolpopexy who were implanted with a PP or PVDF mesh underwent clinical examination and 2D, 3D, and 4D TPUS...
August 6, 2018: International Urogynecology Journal
Xuesong Yi, Dexin Wang, Fei Yang, Yong Wang, Yuguang Zhu, Wenxin Shi
The adsorption mechanism and kinetics of an layer-structured o/w-organic (inorganic-organic) membrane system, which shows a typical single-layer adsorption isotherms accompanied with several influence factors under a wide temperature range were investigated. Quite a small amount of o/w were adsoreb on on the external surface of membrane was observed under several different environment, which is sufficient to affect the flux of the membrane. From several isotherm and kinetics models in simulating adsorption process with variables of time, initial concentration, temperature, that Redlich-Peterson model and pseudo-first-order kinetic model was the best fitting model with its R2 value higher than 0...
August 6, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Esther Lorrayne Machado Pereira, Adriana de Souza Medeiros Batista, Neriene Alves, Arno Heeren de Oliveira, Fabiola A S Ribeiro, Adelina P Santos, Luiz Oliveira de Faria
The industrial application of radiation processing involves high doses of gamma or electron radiation to cause structural changes in materials, such as rubber vulcanization and polymer degradation, among others. A reliable dosimetric system is necessary to guarantee the desired effects and also to avoid damages. Poly(vinylidene fluoride) [PVDF] homopolymer has been recently proposed for application in high gamma dose dosimetry. In this work, nanocomposites made of PVDF filled with zirconium oxide [ZrO2 ] nanoparticles and multiwalled carbon nanotubes [MWCNT] were studied for applications in high dose dosimetry, for doses ranging from 100...
July 11, 2018: Applied Radiation and Isotopes
Muhammad Irfan Siyal, Jong-Oh Kim
Membranes with amphiphobic properties are crucial for desalination of concentrated saline water with organic foulant by membrane distillation. In this research, we coated Fluorographite (FGi) particles on polyvinylidene-fluoride (PVDF) flat sheet membranes with 0.8% v/v polydimethylsiloxane (PDMS) as binder by filtration coating method. We evaluated its amphiphobicity via contact angles which were observed by DI water, canola oil and organic solutions as mimicking for oleophobicity. Surface modifications by FGi particles on the surface of membranes was introduced with PDMS binder which brought bifunctionality of amphiphobicity to enhance hydrophobicity and oleophobicity...
July 20, 2018: Environmental Research
Said Bey, Hassina Semghouni, Alessandra Criscuoli, Mohamed Benamor, Enrico Drioli, Alberto Figoli
This work focuses on the study of the mass transfer of arsenic(V) through asymmetric polyvinylidene fluoride hollow-fiber membrane contactors using Aliquat-336 as an extractant. In the first part of this work, the fibers were prepared and characterized by SEM and by determining their thickness and porosity. From SEM pictures, an asymmetric structure was obtained that was characterized by an inner sponge-like structure and outer finger-like structure with a pore radius and porosity about 0.11 µm and 80%, respectively...
August 2, 2018: Membranes
B Zhu, B Tiller, A J Walker, A J Mulholland, J F C Windmill
Piezoelectric micromachined ultrasonic transducers (PMUTs) are used to receive and transmit ultrasonic signals in industrial and biomedical applications. This type of transducer can be miniaturized and integrated with electronic systems since each element is small and the power requirements are low. The bandwidth of the PMUT may be narrow in some conventional designs, however it is possible to apply modified structures to enhance this. This paper presents a methodology for improving the bandwidth of air-coupled PMUTs without sensitivity loss by connecting a number of resonating pipes of various length to a cavity...
July 31, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Jiang Wei, Fushun Wang, Lidong Zhang
Micropatterning of soft polymer actuators is an emerging technique that overcomes many drawbacks of macroscopic patterning, to trigger the shape-programmable deformations for various functional applications. We thus report a polymer composite actuator that combines micropatterning with high stretchability and toughness, whereupon it demonstrates shape-programmable deformation, and can be utilized in an electronic device for multistage detection of acetone vapors. The actuator is created by alignment of Fe(0) particles (FePs) into poly(vinylidene fluoride) (PVDF) matrix in a strong magnetic field, followed by stretching the PVDF/FePs film into necking structure...
August 1, 2018: ACS Applied Materials & Interfaces
Cuizheng Zhang, Yingfeng Li, Hongliang Wang, Sanfeng He, Yiyi Xu, Chao Zhong, Tao Li
The development of a simple, robust, and generalizable approach for spatially controlled growth of metal-organic frameworks (MOFs) on diverse polymeric substrates is of profound technological significance but remains a major challenge. Here, we reported the use of adhesive bacterial amyloid nanofibers, also known as curli nanofibers (CNFs), major protein components of bacterial biofilms, as universal and chemically/mechanically robust coatings on various polymeric substrates to achieve controlled MOF growth with improved surface coverage up to 100-fold...
July 7, 2018: Chemical Science
Renjie Li, Yanting Wu, Liguo Shen, Jianrong Chen, Hongjun Lin
Membrane fouling problem impedes widespread application of polyvinylidene fluoride (PVDF) membrane for water treatment. This study proposed a novel strategy to endow hydrophobic PVDF ultrafiltration (UF) membrane with good antifouling and antibacterial activity. The novel strategy includes 3 steps: polydopamine (PDA) modification, Ag catalytic activation and electroless Cu plating. Via this strategy, copper nanoparticles (CuNPs) were in situ immobilized on PVDF membrane. The adhesive PDA layer not only facilitated to firm attachment of CuNPs, but also increased surface hydrophilicity...
July 21, 2018: Journal of Colloid and Interface Science
Gaoshuo JIang, Liqiang Luo, Lu Tan, Jinliang Wang, Shenxiang Zhang, Feng Zhang, Jian Jin
Superhydrophobic membranes with extreme liquid water repellency property are good candidates for waterproof and breathable application. Different from the mostly used strategies through either mixing or post-modifying base membranes with perfluorinated compounds, we report in this work a facile methodology to fabricate superhydrophobic microporous membranes made up of pure poly(vinylidene fluoride) (PVDF) via a high-humidity induced electrospinning process. The superhydrophobic property of the PVDF microporous membrane is contributed by its special microsphere-fiber interpenetrated rough structure...
July 27, 2018: ACS Applied Materials & Interfaces
Bo Lu, Khalid Lamnawar, Abderrahim Maazouz, Guillaume Sudre
It is known that the macroscopic properties of multilayer polymer films are largely dominated by the diffuse interphase formed via interfacial diffusion between neighboring layers. However, not much is known about the origin of this effect. In this work, we reveal the role of interfacial diffusion and the diffuse interphase development in multilayer polymer films, based on a compatible poly(vinylidene fluoride) (PVDF)/poly(methyl methacrylate) (PMMA) system fabricated by forced assembly micro-/nanolayer coextrusion...
July 27, 2018: ACS Applied Materials & Interfaces
Prem Wicram Jaschin, Rajasekhar Bhimireddi, Kalidindi Bapiraju Varma
Polymer (polyvinylidene fluoride) nanocrystal composites based on lanthanum nickelate (percolative oxide) and barium titanate were fabricated to obtain material systems with high dielectric constant and low loss to be used for high charge storage applications. Lanthanum nickelate (LaNiO3 ) nanocrystallites were synthesized from a simple citrate-assisted sol-gel route that yielded agglomerated crystallites of an average size of 120 nm. The defective nature of the lanthanum nickelate nanocrystals was revealed by the transmission electron microscopy studies...
July 26, 2018: ACS Applied Materials & Interfaces
Zoltan Nagy, Shane Comer, Albert Smolenski
Phos-tag gels are recent tools to dissect protein phosphorylation that operate by inducing a shift in the electrophoretic mobility of phosphorylated proteins compared to their nonphosphorylated counterparts. This article describes the preparation and electrophoresis of Zn2+ -Phos-tag gels along with electrotransfer of the separated phospho- and nonphosphoproteins onto a PVDF membrane using either wet-tank or semidry transfer. We also discuss the theory behind the technology with critical parameters to keep in mind for its successful application...
July 25, 2018: Current Protocols in Protein Science
Niels L Meereboer, Ivan Terzić, Sarah Saidi, Daniel Hermida Merino, Katja Loos
The electroactive properties of poly(vinylidene fluoride) (PVDF) are a direct consequence of its crystalline phases. Although poorly understood, nanostructuring PVDF in confined geometries can drastically change its crystallization behavior. Therefore, we synthesized a variety of PVDF-based triblock copolymers to gain a better understanding of the melt crystallization and explore how crystallization is affected by the morphology and chemical nature of the amorphous block. Differential scanning calorimetry, small-/wide-angle X-ray scattering, and transmission electron microscopy gave us excellent insights into the morphology and the corresponding crystalline phases...
July 17, 2018: ACS Macro Letters
Abdolreza Ardeshirylajimi, Sayyed Mohammad-Hossein Ghaderian, Mir Davood Omrani, Sadegh Lotfalah Moradi
Since the functional recovery of the reconstructed bladder is related to the bladder wall contraction and existing therapies do not respond to this, tissue engineering could be worth considered promising candidates for developing of conventional treatments in these kinds of ailments. Due to the low mechanical properties of natural scaffolds, biocompatible synthetic scaffolds can play a key role in the stem cells proliferation and differentiation and apply for many tissue-engineering applications. On the other hand, considering the low shelf life of TGFβ, encapsulating this growth factor can help maintain its functionality throughout the study period...
July 17, 2018: Gene
João C Barbosa, José P Dias, Senentxu Lanceros-Méndez, Carlos M Costa
The separator membrane is an essential component of lithium-ion batteries, separating the anode and cathode, and controlling the number and mobility of the lithium ions. Among the polymer matrices most commonly investigated for battery separators are poly(vinylidene fluoride) (PVDF) and its copolymers poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and poly(vinylidene fluoride-cochlorotrifluoroethylene) (PVDF-CTFE), due to their excellent properties such as high polarity and the possibility of controlling the porosity of the materials through binary and ternary polymer/solvent systems, among others...
July 19, 2018: Membranes
Muhammet Aydın, Elif Burcu Aydın, Mustafa Kemal Sezgintürk
A new approach to enhance the electrochemical performance of biosensor was attempted by using Super P© carbon black/Star polymer composite material. In this study, we developed an electrochemical IL 8 biosensor by modification with a conductive composite including Super P, polyvinylidene fluoride (PVDF) and star polymer (SPGMA) of disposable ITO electrode surface. The Super P carbon black as carbonaceous material had a high conductivity and was used for the enhancement of electron transfer between electrode surface and electrolyte...
October 15, 2018: Biosensors & Bioelectronics
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