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Lingxiao Gao, Donglin Hu, Mengke Qi, Jia Gong, Hong Zhou, Xin Chen, Junfei Chen, Jing Cai, Liangke Wu, Ning Hu, Ya Yang, Xiaojing Mu
Triboelectric nanogenerators (TENGs) have been in spotlight for their excellent capability to drive miniature electronics. Herein, we report a sophisticated double-helix-structured triboelectric nanogenerator (DHS-TENG) enhanced with positive charge traps for self-powered temperature sensing and smart-home control system. The DHS-TENG increases the charge density on the contact surfaces by taking advantage of the ferroelectric characteristics of polyvinylidene fluoride (PVDF). In addition, the flexible double-helix-structure endows DHS-TENG with excellent elastic property as it has no external supporting materials...
October 17, 2018: Nanoscale
Jae-Yeop Kim, Jun-Hyun Mo, Young Hun Kang, Song Yun Cho, Kwang-Suk Jang
High-performance thermoelectric composite fibers were prepared via simple wet-spinning of single-walled carbon nanotube (SWCNT)/poly(vinylidene fluoride) (PVDF) pastes using a common solvent/coagulation system. By improving the content and dispersion state of SWCNTs in the composite fibers, the thermoelectric performance could be effectively enhanced. With n-type doping of SWCNTs using polyethylenimine, high-performance n-type SWCNT/PVDF composite fibers could be prepared. The power factors of the p- and n-type SWCNT/PVDF composite fibers with the SWCNT content of 50 wt% were 378 ± 56 and 289 ± 98 μW m-1 K-2, respectively...
October 17, 2018: Nanoscale
Asif Khan, Faisal Raza Khan, Heung Soo Kim
Electro-active paper (EAPap) is a cellulose-based smart material that has shown promising results in a variety of smart applications (e.g., vibration sensor, piezo-speaker, bending actuator) with the merits of being flexible, lightweight, fracture tolerant, biodegradable, naturally abundant, cheap, biocompatible, and with the ability to form hybrid nanocomposites. This paper presents a review of the characterization and application of EAPap as a flexible mechanical vibration/strain sensor, bending actuator, and vibration energy harvester...
October 15, 2018: Sensors
Nives Vodišek, Andraž Šuligoj, Dorota Korte, Urška Lavrenčič Štangar
Self-cleaning and/or photocatalytic films on polymer substrates have found numerous applications during the past decades. However, the common demand for high-temperature post synthesis treatment limits the application to temperature resistant substrates only. Herein, we prepared self-cleaning photocatalytic films on four thermosensitive polymeric substrates: polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), and acryl coated polyester (PES) fabric (D2) with poly(vinylidene fluoride) (PVDF) containing lacquer (D1)...
October 11, 2018: Materials
Aleksi Hänninen, Essi Sarlin, Inari Lyyra, Timo Salpavaara, Minna Kellomäki, Sampo Tuukkanen
Nanocellulose and chitosan have recently started to get attention as environmentally friendly piezoelectric materials for sensor and energy harvesting applications. Conversely, current commercially available flexible piezoelectric films made of for example polyvinylidene difluoride (PVDF) are relatively expensive and made from non-renewable materials. We measured the piezoelectric responses (2-8 pC/N) for solvent casted films based on nanocellulose, microcrystalline chitosan and their blends. In addition, the tensile properties of the piezoelectric films were characterized to find out if chitosan could be used to enhance the flexibility of the brittle nanocellulose films...
December 15, 2018: Carbohydrate Polymers
Hyun Soo Kim, Dong Woo Lee, Do Hyung Kim, Dae Sol Kong, Jinhyeok Choi, Minbaek Lee, Gonzalo Murillo, Jong Hoon Jung
The electric power output of a piezoelectric nanogenerator (PENG) depends on the various physical parameters of the constituent materials, including the piezoelectric coefficient, Young's modulus, and dielectric constant. Herein, we report the mechanical and electrical properties of a poly(vinylidene fluoride)⁻BaTiO₃ (PVDF⁻BTO) composite-based PENG. Variation of the BTO nanoparticle (NP) content enabled the systematic tuning of the physical parameters that are related to power generation in the composite...
September 30, 2018: Nanomaterials
Remi Roche, Fatma Yalcinkaya
Membranes are considered as a promising technology for separation and filtration processes. Here, novel polyvinylidene fluoride (PVDF) nanofibrous multilayer membranes were fabricated by wire-based industrial electrospinning equipment following by a lamination process. The lamination process was optimised under various applied temperature, force of lamination, and lamination time. Air permeability and burst-pressure tests were run to determine the optimum membranes for filtration application. The structures of the prepared membranes were characterised by scanning electron microscopy and pore-size analysis...
September 29, 2018: Nanomaterials
N Quezada, G Maturana, E Pimentel, F Crovari, R Muñoz, N Jarufe, F Pimentel
BACKGROUND: Cholecystectomy and inguinal hernioplasty are the most frequent surgeries in Chile and the world. Laparoscopic inguinal hernioplasty, being a clean surgery, reports mesh infection rates of less than 2% and adding a simultaneous laparoscopic cholecystectomy is controversial due to an increase in the risk of mesh infection. The aim of this paper is to report the results of simultaneous TAPP hernioplasty with laparoscopic cholecystectomy. METHOD: Retrospective analysis of the digestive surgery database...
September 26, 2018: Hernia: the Journal of Hernias and Abdominal Wall Surgery
Milad Ghani, Sayed Mehdi Ghoreishi, Mostafa Azamati
Herein, the applicability of Mg-Al-layered double hydroxide-graphene oxide (LDH/GO) mixed-matrix membrane (MMM) for microextraction purposes is reported for the first time. The LDH/GO MMM was used as sorbent for the thin film microextraction (TFME) of diclofenac in human body fluids. The prepared LDH/GO composite has been incorporated into a mechanically stable polyvinylidene difluoride (PVDF) membrane. The contribution of GO in LDH/GO composites significantly improved the extraction efficiency of the TFME sorbent...
September 17, 2018: Journal of Chromatography. A
Lihong Wang, Lifen Liu, Fenglin Yang
An efficient and cost-effective bio-photo-electro-catalytic reactor (BPEC) was developed, it combined bio-anode with TiO2 photo-electro-catalytic air cathode and could remove rapidly model gas phase VOC ethyl acetate (EA) and generate electricity simultaneously. This BPEC system exhibited a synergistic effect between the photo-electro-catalysis and microbial fuel cell (MFC) bio-electrochemical process. Calculated kinetic constant of the BPEC system (0.085 min-1 ) was twice the sum of those of photocatalysis (only electrolyte in the anode, without microbes, 0...
September 8, 2018: Bioresource Technology
Jagabandhu Patra, Purna Chandra Rath, Chi Li, Hsien-Ming Kao, Fu-Ming Wang, Ju Li, Jeng-Kuei Chang
SnO2@CMK-8 composite, a highly promising anode for Na-ion batteries (NIBs), is incorporated with polyvinylidene difluoride (PVDF), sodium carboxymethylcellulose (NaCMC), sodium polyacrylate (NaPAA), and NaCMC/NaPAA mixed binders to optimize the electrode sodiation/desodiation properties. Synergistic effects between NaCMC and NaPAA lead to the formation of an effective protective film on the electrode. This coating layer not only increases the charge-discharge Coulombic efficiency, suppressing the accumulation of solid-electrolyte interphases, but also keeps the SnO2 nanoparticles in the CMK-8 matrix, preventing oxide agglomeration and falling off upon cycling...
September 24, 2018: ChemSusChem
Sanjib Banerjee, Judith Schmidt, Yeshayahu Talmon, Hisao Hori, Takuma Asai, Bruno Ameduri
An original degradable fluorinated surfactant, 3-hydroxy-2-(trifluoromethyl)propanoic acid (MAF-OH), was applied for the emulsion polymerization of vinylidene fluoride (VDF) to yield a latex of PVDF, consisting of typically 100 nm particle diameters. This surfactant was shown to be easily decomposed in subcritical water, releasing fluoride anions. The % reversed head-to head (H-H) addition is greatly minimized (2.4%) in the PVDF, prepared in the presence of MAF-OH surfactant.
October 9, 2018: Chemical Communications: Chem Comm
Kanthasamy Raagulan, Ramanaskanda Braveenth, Hee Jung Jang, Yun Seon Lee, Cheol-Min Yang, Bo Mi Kim, Jai Jung Moon, Kyu Yun Chai
MXene and graphene based thin, flexible and low-density composite were prepared by cost effective spray coating and solvent casting method. The fabricated composite was characterized using Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray (EDX). The prepared composites showed hydrophobic nature with higher contact angle of 126°, -43 mN·m-1 wetting energy, -116 mN·m-1 spreading Coefficient and 30 mN·m-1 lowest work of adhesion...
September 22, 2018: Materials
Sokol Rexhepi, Entela Rexhepi, Martin Stumm, Sebastian Ludwig
Objective Sacrocolpopexy is the gold-standard for apical prolapse treatment. However, the technical performance of each SCP is strongly dependant on the surgeon´s own discretion and comparison of clinical outcomes with respect to urinary incontinence (UI) is difficult. We developed a comprehensible laparoscopic surgical technique for the treatment of apical prolapse with UI. Methods A total of 120 women with UI underwent laparoscopic bilateral sacrocolpopexy for apical prolapse. Thereby, the uterosacral ligaments (USL) were bilaterally replaced by polyvinylidene fluoride (PVDF) tapes of identical length and shape, which were fixed at defined anatomical landmarks (cervix / vaginal vault and S1)...
September 22, 2018: Journal of Endourology
Qiang Yi, Wenqiang Zhang, Shaoqing Li, Xinyuan Li, Chunwen Sun
High-performance electrolytes and electrode materials play a critical role in advanced sodium-ion batteries with higher energy densities. In this work, we prepared a poly(methyl methacrylate)-filled composite electrolyte (named as GHSE) by in situ polymerization of methyl methacrylate in the porous Na3 Zr2 Si2 PO12 -polymer vinylidene fluoride-hexafluoropropylene composite membrane for the first time. The GHSE membrane exhibits a high ionic conductivity (2.78 × 10-3 S cm-1 ), wide electrochemical window (∼4...
October 4, 2018: ACS Applied Materials & Interfaces
Junjian Zheng, Kaili Yan, Zhichao Wu, Mingxian Liu, Zhiwei Wang
Removal of sulfanilic acid (SA) from water is an urgent but still challenging task. Herein, we developed a low pressure electrochemical membrane filtration (EMF) system for SA decontamination using RuO2 -TiO2 @Ti/PVDF composite membrane to serve as not only a filter but also an anode. Results showed that efficient removal of SA was achieved in this EMF system. At a charging voltage of 1.5 V and a electrolyte concentration of 15 mM, flow-through operation with a hydraulic retention time (HRT) of 2 h led to a high SA removal efficiency (80...
2018: Frontiers in Chemistry
Anbharasi Vanangamudi, Ludovic F Dumée, Mikel C Duke, Xing Yang
Controlling surface⁻protein interaction during wastewater treatment is the key motivation for developing functionally modified membranes. A new biocatalytic thermo-responsive poly vinylidene fluoride (PVDF)/nylon-6,6/poly( N -isopropylacrylamide)(PNIPAAm) ultrafiltration membrane was fabricated to achieve dual functionality of protein-digestion and thermo-responsive self-cleaning. The PVDF/nylon-6,6/PNIPAAm composite membranes were constructed by integrating a hydrophobic PVDF cast layer and hydrophilic nylon-6,6/PNIPAAm nanofiber layer on to which trypsin was covalently immobilized...
September 19, 2018: Membranes
Marco Fortunato, Chandrakanth Reddy Chandraiahgari, Giovanni De Bellis, Paolo Ballirano, Francesca Sarto, Alessio Tamburrano, Maria Sabrina Sarto
Novel polymer-based piezoelectric nanocomposites with enhanced electromechanical properties open new opportunities for the development of wearable energy harvesters and sensors. This paper investigates how the dissolution of different types of hexahydrate metal salts affects β -phase content and piezoelectric response (d33 ) at nano- and macroscales of polyvinylidene fluoride (PVDF) nanocomposite films. The strongest enhancement of the piezoresponse is observed in PVDF nanocomposites processed with Mg(NO₃)₂⋅6H₂O...
September 19, 2018: Nanomaterials
Jianming Yang, Fuan He, Huijun Wu, Yuying Liang, Yuxuan Wang, Zhi Sun
Understanding the effect of a porous TiO₂ nanolayer on the optical scattering and absorption through electrospun fibers is of great importance for the design and development of advanced optical extinction materials. Based on electrospinning and controllable self-assembly techniques, pure electrospun poly(vinylidene fluoride) (PVDF) fibers and TiO₂-coated ones with different self-assembly cycles were prepared. The effect of TiO₂ self-assembly cycles on surface parameters, e.g., thickness, assembled content, and porosity of the TiO₂ nanolayer were determined by scanning electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy...
September 19, 2018: Nanomaterials
Mohammadmehdi Aghelinejad, Siu Ning Leung
A facile processing strategy to fabricate thermoelectric (TE) polymer nanocomposite foams with non-conducting polymers is reported in this study. Multilayered networks of graphene nanoplatelets (GnPs) and multi-walled carbon nanotubes (MWCNTs) are deposited on macroporous polyvinylidene fluoride (PVDF) foam templates using a layer-by-layer (LBL) assembly technique. The open cellular structures of foam templates provide a platform to form segregated 3D networks consisting of one-dimensional (1D) and/or two-dimensional (2D) carbon nanoparticles...
September 18, 2018: Materials
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