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Zhi-Guang Zhang, Hui Liu, Xiao-Xiong Wang, Jun Zhang, Miao Yu, Seeram Ramakrishna, Yun-Ze Long
Novel flexible and recyclable core-shell heterostructured fibers based on cauliflower-like MoS₂ and TiO₂/PVDF fibers have been designed through one-step hydrothermal treatment based on electrospun tetrabutyl orthotitanate (TBOT)/PVDF fibers. The low hydrothermal temperature avoids the high temperature process and keeps the flexibility of the as-synthesized materials. The formation mechanism of the resultant product is discussed in detail. The composite of MoS₂ not only expands the light harvesting window to include visible light, but also increases the separation efficiency of photo-generated electrons and holes...
March 14, 2019: Nanomaterials
Minje Kim, DaeHoon Park, Md Mehebub Alam, Sol Lee, Pangun Park, Junghyo Nah
Performance enhancement of triboelectric nanogenerators (TENGs) has been largely limited by the relatively low output current density. Thus, extensive research efforts have been made to increase the output current density. In this respect, this work presents a novel method to remarkably increase output current density of TENGs by adopting polarized ferroelectric polymers and MoS2 composite. Specifically, by compositing bulk MoS2 flakes with both Nylon 11 and PVDF-TrFE, respectively, charge density of each triboelectric charging surface was significantly increased...
March 15, 2019: ACS Nano
Yan Sun, Xiaowen Zhan, Jiazhi Hu, Yikai Wang, Shuang Gao, Yuhua Shen, Yang-Tse Cheng
Ceramic-polymer composite electrolytes (CPEs) are being explored to achieve both high ionic conductivity and mechanical flexibility. Here, we show that, by incorporating 10 wt% (3 vol%) mixed-sized fillers of Li7La3Zr2O12 (LLZO) doped with Nb/Al, the room temperature ionic conductivity of a polyvinylidene fluoride (PVDF)-LiClO4-based composite can be as high as 2.6×〖10〗^(-4) S/cm which is one order of magnitude higher than that with nano- or micro-meter sized LLZO particles as fillers. The CPE also shows a high lithium-ion transference number of 0...
March 11, 2019: ACS Applied Materials & Interfaces
Ali Mirzaei, Abbas Shapouri Moghadam, Mohamad Foad Abazari, Fatemeh Nejati, Sepehr Torabinejad, Mohamad Kaabi, Seyed Ehsan Enderami, Abdolreza Ardeshirylajimi, Maryam Darvish, Fatemeh Soleimanifar, Ehsan Saburi
In recent decades, tissue engineering has been the most contributor for introducing 2D and 3D biocompatible osteoinductive scaffolds as bone implants. Polyvinylidene fluoride (PVDF), due to the unique mechanical strength and piezoelectric properties, can be a good choice for making a bone bioimplant. In the present study, PVDF nanofibers and film were fabricated as 3D and 2D scaffolds, and then, osteogenic differentiation potential of the human induced pluripotent stem cells (iPSCs) was investigated when grown on the scaffolds by evaluating the common osteogenic markers in comparison with tissue culture plate...
March 9, 2019: Journal of Cellular Physiology
Sebastian Ludwig, Bernd Morgenstern, Peter Mallmann, Wolfram Jäger
INTRODUCTION AND HYPOTHESIS: To elevate and suspend the apical end of the vagina, the uterosacral ligaments (USL) were replaced by polyvinylidene fluoride (PVDF) structures. These PVDF structures were placed in the peritoneal folds of the USL at the pelvic wall to mimic the lateral and backward tension and to avoid rectal obstruction. A special tunneling device was used, which allowed the semi-circular placement of the structure without destroying the peritoneum. METHODS: A 59-year-old woman with mixed urinary incontinence and apical prolapse (pelvic organ prolapse quantification system, POP-Q, stage 2) of the uterus underwent laparoscopic bilateral USL replacement...
March 8, 2019: International Urogynecology Journal
Hanpeng Gao, Yan Liu, Guo Yong Wang, Shuyi Li, Zhiwu Han, Luquan Ren
Membrane materials with special wettability for separating oil-water mixtures have gradually become one of the research hotspots. However, oily wastewater usually contains very strong corrosiveness, which puts forward high requirements for the chemical stability of the separation membrane. In addition, oil droplets may block the pores, resulting in the decrease of separation efficiency or even separation failure. Herein, a biomimetic TiO2-titanium meshes (BTTM) with switchable wettability was successfully fabricated by one-step dip coating of PVDF and modified TiO2 suspension on the titanium meshes...
March 8, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
Zechun Xiao, Rui Zheng, Yongjie Liu, Hailong He, Xiaofei Yuan, Yunhui Ji, Dongdong Li, Huabing Yin, Yuebiao Zhang, Xue-Mei Li, Tao He
Scaling in membrane distillation (MD) is a key issue in desalination of concentrated saline water, where the interface property between the membrane and the feed become critical. In this paper, a slippery mechanism was explored as an innovative concept to understand the scaling behavior in membrane distillation for a soluble salt, NaCl. The investigation was based on a novel design of a superhydrophobic polyvinylidene fluoride (PVDF) membrane with micro-pillar arrays (MP-PVDF) using a micromolding phase separation (μPS) method...
February 1, 2019: Water Research
Kartik Behera, Mithilesh Yadav, Fang-Chyou Chiu, Kyong Yop Rhee
In this study, a graphene nanoplatelet (GNP) was used as a reinforcing filler to prepare poly(vinylidene fluoride) (PVDF)/high density polyethylene (HDPE) blend-based nanocomposites through a melt mixing method. Scanning electron microscopy confirmed that the GNP was mainly distributed within the PVDF matrix phase. X-ray diffraction analysis showed that PVDF and HDPE retained their crystal structure in the blend and composites. Thermogravimetric analysis showed that the addition of GNP enhanced the thermal stability of the blend, which was more evident in a nitrogen environment than in an air environment...
March 4, 2019: Nanomaterials
Wondo Kim, Soonjae Pyo, Min-Ook Kim, Yongkeun Oh, Dae-Sung Kwon, Jongbaeg Kim
We present a triboelectric energy harvester fabricated by simple electrospinning process of polyvinylidene fluoride/polyurethane polymers on conductive fabric. This electrospinning process provides higher electrical output power and hydrophobicity driven humidity resistance compared to flat polymer energy harvesters. By using conductive fabric as collector and electrode, the device could retain air permeability and flexibility. The triboelectric energy harvester exhibits a high open-circuit voltage of 45.1 V (at compressive contact force of 20 N, relative humidity (RH) of 20%), humidity resistance (maintains about 40% of open-circuit voltage at RH 80%) and air permeability without deteriorating air permeability of the fabric...
March 5, 2019: Nanotechnology
Yuming Wu, Xiaosong Du, Ruoyao Gao, Jimeng Li, Weizhi Li, He Yu, Zhi Jiang, Zhidong Wang, Huiling Tai
Polyvinylidene fluoride (PVDF) films possess multifunctional ability for piezo/pyro/ferroelectronic applications. One critical challenge of the traditional techniques is the complicated fabrication process for obtaining the poled films. In this work, the PVDF film is facilely prepared by the solution cast on hydrophilically treated substrates. The obtained PVDF films exhibit fairly good pyroelectricity comparable to those fabricated by thermal poling, indicating the film is self-polarized. This result is attributed to the hydrogen-bonding-induced orderly arrangement of the first sub-nanolayer at the bottom, which serves as a "seed layer" and triggered alignment of the rest of the film in a layer-by-layer approach...
February 28, 2019: Nanoscale Research Letters
Mohanad Kamaz, Arijit Sengupta, Ashley Gutierrez, Yu-Hsuan Chiao, Ranil Wickramasinghe
Direct contact membrane distillation (DCMD) has been conducted to treat hydraulic fracturing-produced water using polyvinylidenedifluoride (PVDF) membranes. Tailoring the surface properties of the membrane is critical in order to reduce the rate of adsorption of dissolved organic species as well as mineral salts. The PVDF membranes have been modified by grafting zwitterion and polyionic liquid-based polymer chains. In addition, surface oxidation of the PVDF membrane has been conducted using KMnO₄ and NaOH...
February 26, 2019: International Journal of Environmental Research and Public Health
Yuan Qiao, Qing Ma, Haifeng Zhai, Ya Li, Minke Tang
OBJECTIVE: Exposure to female estrous, a natural rewarding experience, alleviates anxiety and depression, and the contribution of this behavior to stroke outcome is unknown. The aim of this study was to evaluate whether exposure to female estrous is beneficial to recovery following transient ischemic stroke in male mice. METHODS: Cerebral ischemia was induced in male ICR mice with thread occlusion of the middle cerebral artery (MCAO) for 30 min followed by reperfusion...
February 27, 2019: Neurological Research
Ming Li, Jinzhang Liu, Dezhi Zheng, Mingsheng Zheng, Yi Zhao, Mingjun Hu, Guanghui Yue, Guangcun Shan
Plastic film capacitors suffer from low charge storage capacity due to the low dielectric constant of the polymer (<10). We have devised a polyvinylidene fluoride (PVDF) composite film filled with small-size graphene oxide (GO) sheets that have aromatic molecules attached to their surfaces. The use of 4,4'-oxydiphenol molecules to functionalize graphene sheets is found to have a remarkable effect on enhancing the dielectric permittivity as well as reducing the electrical conductivity of the nanocomposite...
February 25, 2019: Nanotechnology
Jing Han, Dong Li, Chunmao Zhao, Xiaoyan Wang, Jie Li, Xinzhe Wu
A thin film of polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) has good flexibility and simple preparation process. More importantly, compared with PVDF, its piezoelectric β-phase can be easily formed without mechanical stretching. However, its piezoelectricity is relatively lower. Therefore, at present, PVDF-TrFE is always compounded with other kinds of piezoelectric materials to solve this problem. The effect of nano-ZnO doping amount on the sensing characteristics of the piezoelectric films was studied...
February 18, 2019: Sensors
Ouassila Benhabiles, Francesco Galiano, Tiziana Marino, Hacene Mahmoudi, Hakim Lounici, Alberto Figoli
The approach of the present work is based on the use of poly (methylmethacrylate) (PMMA) polymer, which is compatible with PVDF and TiO₂ nanoparticles in casting solutions, for the preparation of nano-composites membranes using a safer and more compatible solvent. TiO₂ embedded poly (vinylidene fluoride) (PVDF)/PMMA photocatalytic membranes were prepared by phase inversion method. A non-solvent induced phase separation (NIPS) coupled with vapor induced phase separation (VIPS) was used to fabricate flat-sheet membranes using a dope solution consisting of PMMA, PVDF, TiO₂, and triethyl phosphate (TEP) as an alternative non-toxic solvent...
February 17, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Liguo Shen, Yicheng Zhang, Weiming Yu, Renjie Li, Minglei Wang, Qianhong Gao, Jianxi Li, Hongjun Lin
This study proposed a novel strategy to improve performance of inherently hydrophobic poly(vinylidene fluoride) (PVDF) membrane. The proposed strategy combined radiation grafting of poly(acrylic acid) (PAA) and electroless nickel plating. After a 5 min plating by using this modification strategy, the water contact angle of the modified membrane decreased from 75.5° to 47.1°, and water content ratio increased from 61.4% to 109.9%. The modified PVDF-g-PAA-Ag@Ni membrane presented 100% flux recovery and reduced fouling propensity when filtrating 0...
February 6, 2019: Journal of Colloid and Interface Science
Barbara Stadlober, Martin Zirkl, Mihai Irimia-Vladu
With the advent of the Internet of Everything (IoE) era, our civilization and future generations will employ an unimaginable complex array of electronics and sensors in daily life. Ferroelectric polymers represent a core group of materials supporting the fast development of IoE, and their functionality, straightforward processing and unmatched versatility make them prime candidates for integration in multifaceted devices. Since they are highly selective, highly responsive, highly scalable, self-powering and compatible with flexible and stretchable substrates, they can be easily integrated with various electronics into numerous stand-alone objects and even into skin as sensors for monitoring diverse mechanical, thermal and vital parameters...
February 18, 2019: Chemical Society Reviews
Wei Zhang, Gong Zhang, Qinghua Ji, Huijuan Liu, Ruiping Liu, Jiuhui Qu
Solar evaporation is a cost-effective way for obtaining clean water using renewable energy. However, many solar evaporation devices still show unsatisfactory performance and suffer from inefficient utilization of absorbed solar energy. Herein, numerical simulations of solar evaporation demonstrate that the heat management is a key factor governing the solar evaporation efficiency. This prediction is confirmed through using a bilayered solar steam generation architecture (HS-CB) both in lab- and pilot-scale study...
February 18, 2019: ACS Applied Materials & Interfaces
Ehsan Saburi, Maryam Islami, Simzar Hosseinzadeh, Abbas Shapouri Moghadam, Reyhaneh Nassiri Mansour, Esmaeel Azadian, Zeinab Joneidi, Amin Reza Nikpoor, Mohammad Hassan Ghadiani, Zohreh Khodaii, Abdolreza Ardeshirylajimi
Due to the several limitations that surgeons are faced during bone tissue implantation there are daily increases in introducing new cell-co-polymer composites for use in bone tissue engineering approaches. In this study tried to develop a suitable nanostructured bio-composite for enhancing osteogenic differentiation of the human induced pluripotent stem cells (iPSCs). Polyvinylidene fluoride-Graphene oxide (PVDF-GO) nanofibers was fabricated by electrospinning and then characterized using scanning electron microscope, tensile and viability assays...
February 14, 2019: Gene
N Hamzah, M Nagarajah, C P Leo
Fat, oil and grease in wastewater generated from household kitchens, restaurants and food processing plants affect sewer systems, water resources and environment adversely. Hence, membrane distillation of saline and oily water was studied using a nearly superhydrophobic membrane developed in this work. Polyvinylidene fluoride (PVDF) membrane incorporated SiO2 nanoparticles was synthesized via phase inversion with dual baths and modified using hexadecyltrimethoxy silane. The volume ratio of silane to ethanol was varied between 1:200 to 1:25...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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