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Cody O'Meara, Iuliia A Polozhentceva, Mikhail P Karushev, Sajith Dharmasena, Hanna Cho, Benjamin J Yurkovich, Sam Kogan, Jung-Hyun Kim
Systematic physical and electrochemical characterizations revealed unique positive multifunction of a polymeric salen-type nickel(II) complex, poly[Ni(CH3 -Salen)], as an additive for conventional cathodes in lithium-ion (Li-ion) batteries. Due to its promising electrochemical and mechanical properties, combined with its unique three-dimensional (3D) web-like electron-network structure, the redox-active-organometallic polymer can eliminate conductive carbon and replace significant portion of polyvinylidene fluoride (PVdF) binder that have been used in conventional LiFePO4 cathodes...
December 12, 2018: ACS Applied Materials & Interfaces
Reza Salehiyan, Suprakas Sinha Ray, Florian J Stadler, Vincent Ojijo
In this study, small amplitude oscillatory shear tests are applied to investigate the rheological responses of polylactide/poly(vinylidene fluoride) (PLA/PVDF) blends and to correlate their viscoelastic properties with the morphological evolutions during processing. Although the analysis of the elastic moduli reveals some changes as a function of blend composition and processing time, the weighted relaxation spectra are shown to be more useful in detecting changes. The analysis demonstrates that when PVDF, i...
December 3, 2018: Materials
Mahdi Mohammadi Ghaleni, Abdullah Al-Balushi, Shayan Kaviani, Elham Tavakoli, Mona Bavarian, Siamak Nejati
Desalination of oil-contaminated saline water using membrane distillation requires hydrophobic membranes with underwater superoleophobic surfaces. For designing such membranes, the chemistry and morphology of the interfacial domains in contact with the contaminated water need to be adjusted such that a stable water layer, adhering to the surface, prevents oil droplets from wetting the membrane. In this article, we present an approach that relies on the controlled functionalization of the surface of Polyvinylidene Fluoride (PVDF) membranes; we adjust the surface topography of the membranes and introduce chemical heterogeneity to them...
December 4, 2018: ACS Applied Materials & Interfaces
Damir A Popov, John M Luna, Nicholas M Orchanian, Ralf Haiges, Courtney A Downes, Smaranda C Marinescu
The reduction of CO2 into higher energy products such as carbon-based fuels and feedstocks is an attractive strategy for mitigating the continuous rise in CO2 emissions associated with the growing global energy demand. Rhenium tricarbonyl complexes bearing 2,2'-bipyridine (2,2'-bpy) ligands are well-established molecular electrocatalysts for the selective reduction of CO2 to CO. Construction of efficient devices for this electrochemical process requires the immobilization of electrocatalysts to electrode surfaces...
November 30, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Kuiling Li, Deyin Hou, Chaochen Fu, Kai Wang, Jun Wang
To improve the mechanical properties of the electrospun nanofibrous membrane, the nonwoven fabrics and spacer fabrics were employed as support substrates to fabricate polyvinylidene fluoride (PVDF) nanofibrous composite membranes. The influences of the substrate on membrane morphology, hydrophobicity, pore size and pore size distribution, porosity, mechanical strength and permeability were comprehensive evaluated. The electrospun composite membranes had a three dimension bead-fiber interconnected open structure and a rough membrane surface...
January 2019: Journal of Environmental Sciences (China)
Wenzheng Yu, Nigel Graham, Ting Liu
Although conventional coagulation pre-treatment can mitigate the fouling of ultrafiltration (UF) membrane when treating raw waters, it is insufficient to restrict the development of irreversible fouling and reversible fouling to a low level. In this paper we demonstrate that the intermittent addition of H2 O2 into the membrane tank during backwash events (after coagulation pre-treatment) successfully prevented the development of any significant membrane fouling. Laboratory-scale tests were undertaken using two membrane systems operated in parallel over 60 days, one serving as a reference coagulation-ultrafiltration (CUF) process, and the other receiving the H2 O2 (CUF-H2 O2 ), with a decreasing dose in three successive phases: 10, 5 and 2 mg/L...
November 8, 2018: Water Research
Seung Hwangbo, Jong-Min Kang, Woo-Min Min, Jun-Ho Lee, Kyu-Seog Hwang
Poly(vinylidene fluoride) (PVDF) is one of the most studied polymers that exhibits piezoelectric and ferroelectric properties. PVDF crystallizes into four different forms, namely α , β , γ , and δ phases. Generally, the nonpolar α phase, as a replacement for the polar β phase with the most superior ferroelectric and piezoelectric properties, is formed from the precursor melt and solution. Here, we report a method for the preparation of β -phase-dominant PVDF thin films by doping PVDF solution with a metal hydrated salt, such as Co(NO₃)₂·6H₂O, without any stretching procedure...
March 1, 2019: Journal of Nanoscience and Nanotechnology
Sanghyun Yoon, Dong-Jin Shin, Young-Ho Ko, Kyung-Ho Cho, Jung-Hyuk Koh
In these days, we are facing emerging energy crisis due to depletion of fossil fuels. Therefore, renewable energy which is based on wind energy, mechanical force energy, microwave energy and vibrations energy have attracted a lot of attentions. Piezoelectric energy harvesting is one of the promising renewable energy sources. As the use portable electronic devices increases, the need for portable renewable energy sources further increases. Especially, piezoelectric materials can be the best selection due to their robust properties...
March 1, 2019: Journal of Nanoscience and Nanotechnology
Kunpeng Wang, Deyin Hou, Peng Qi, Kuiling Li, Ziyi Yuan, Jun Wang
Membrane fouling caused by non-polar foulants is a challenging problem for hydrophobic membranes, which hinders the industrial implementation of membrane distillation (MD). The hydrophilic coating can create a hydration layer at solid-water interface, thereby the hydrophilic surfaces are expected to supply a barrier inhibiting adhesion of hydrophobic foulants. Hence, it should be possible to develop anti-fouling composite membranes through constructing a hydrophilic skin layer onto hydrophobic MD membranes...
November 13, 2018: Journal of Colloid and Interface Science
Ming Luo, Zenghui Chong, Dongsheng Liu
In the milling process, cutting forces contain key information about the machining process status in terms of workpiece quality and tool condition. On-line cutting force measurement is key for machining condition monitoring and machined surface quality assurance. This paper presents a novel instrumented working table with integrated polyvinylidene fluoride (PVDF) thin-film sensors, thus enabling the dynamic milling force measurement with compact structures. To achieve this, PVDF thin-film sensors are integrated into the working table to sense forces in different directions and the dedicated cutting force decoupling model is derived...
November 19, 2018: Sensors
Roshni L Thankamony, Xiang Li, Xiaolin Fan, Guan Sheng, Xinbo Wang, Shuyu Sun, Xixiang Zhang, Zhiping Lai
The predominant method to prepare polymer membranes is based on phase-inversion. However, this method always leads to a dense skin with low porosity when normal polymers are used. Using the self-assembly of certain block copolymers, it is possible to prepare uniform pores with high porosity, but the prices of these polymers are too high to be afforded in practical applications. Here, we report a novel strategy to prepare highly porous and asymmetric polymer membranes using the widely used polyvinylidene fluoride (PVDF) as a prototype...
November 20, 2018: ACS Applied Materials & Interfaces
Kuntal Maity, Samiran Garain, Karsten Henkel, Dieter Schmeißer, Dipankar Mandal
Natural piezoelectric material is of increasing interest particularly for applications in biocompatible, implantable, and flexible electronic devices. In this paper we introduce a cost effective, easily available natural piezoelectric material, i.e., sugar in the field of wearable piezoelectric nanogenerator (PNG) where low electrical output, biocompatibility and performance durability are still critical issues. We report on a high performance piezo-organic nanogenerator (PONG) based on the hybridization of sugar encapsulated polyvinylidene fluoride (PVDF) nanofiber webs (SGNFW)...
November 20, 2018: ACS Applied Materials & Interfaces
Roman M Eickhoff, Tim Bolle, Klas Kossel, Daniel Heise, Andreas Kroh, Andreas Lambertz, Andreas Blaeser, Thomas Gries, Stefan Jockenhoevel, Ulf P Neumann, Christian D Klink
The biocompatibility of a textile implant is determined by various parameters, such as material composition and surface chemistry. However, little is known about the influence of geometry of sutures on biocompatibility. To elucidate this factor we focused on geometry-modification resulting in ultrafine polyethylene terephthalate (UFPET) suture and a snowflake like shaped polyvenylidenfluorid (PVDF) suture. Forty-eight rats were divided into two observation periods. In each rat 3 out of 4 sutures (profiled UFPET, snowflake-like profiled PVDF, reference Prolene and Mersilene suture) were randomly placed into the subcutaneous tissue...
November 19, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Rafida Sahrash, Asima Siddiqa, Humaira Razzaq, Tahir Iqbal, Sara Qaisar
Ionogels have emerged as one of the most interesting and captivating form of composites which credits to the outstanding characteristics. One of the most important constituent of ionogels is ionic liquid, which show many attractive properties notably non-volatility, in-flammability, negligible vapor pressure, tunability, thermal stability and solvating ability. A large variety of matrix materials have been under consideration for ionogels, presently, polymer/ionic liquid based ionogels have attracted much attention...
November 2018: Heliyon
Yi Ren, Ting Li, Weiming Zhang, Shu Wang, Mengqi Shi, Chao Shan, Wenbin Zhang, Xiaohong Guan, Lu Lv, Ming Hua, Bingcai Pan
Multifunctional ultrafiltration membranes need to be further developed with ultrafiltration performance and high multifunctional decontamination efficiency. Here, the MIL-PVDF multifunctional ultrafiltration membrane with ultrahigh MIL loading was demonstrated by a new blending method of predispersion in acetone and thermally induced phase separation. Due to the improved dispersity and restriction of pore size, the MIL-53(Fe) mass loading was as high as approximately 61%. The new membrane showed high performance for methylene blue (MB) removal and maintained high permeability and ultrafiltration efficiency...
November 7, 2018: Journal of Hazardous Materials
Andrew Youssef, David Matthews, Andrew Guzzomi, Jie Pan
A major contributor to longitudinal vibration in marine propulsion systems is propeller induced excitation. This constitutes a key source of underwater acoustical radiation through excitation of the hull. Understanding this hydrodynamic force at the interface of the thrust bearing is important in order to develop an accurate vibrational model of the propulsion system and in determining potential control mechanisms. In order to investigate the thrust force during operation of a propulsion system, Polyvinylidene Fluoride (PVDF) was embedded into the stationery collar inside a custom thrust bearing in a scaled model of a typical propulsion system...
November 15, 2018: Sensors
Muath Bani-Hani, M Amin Karami
In this paper, we propose a device that can induce vibration to potentially accelerate the rate of orthodontic tooth movement and thus reduce the duration of the orthodontic treatment. This is accomplished by harmonically exciting a polyvinylidene fluoride (PVDF) piezoelectric actuators to generate vibration and hence generate cyclic loading at 30 Hz. PVDF is a popular piezoelectric polymer because of its high flexibility, biocompatibility, and low cost. Generally, application of cyclic loading (vibration) reverses bone loss, stimulates bone mass, induces cranial growth, and accelerates tooth movement...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Keita Tsukagoshi, Takuya Hashimoto, Takuji Koike
The difficulty of swallowing, called dysphagia, causes aspiration pneumonia which is particularly a big health concern in aging society. Therefore, prevention and treatment of dysphagia would contribute to extending healthy-life and QOL of elderly people and decreasing healthcare cost. Conventional reliable methods for evaluating swallowing function require special equipment and are not suitable for long-term monitoring at home or welfare facilities. Therefore, various kinds of quantitative assessment method using biological signals such as swallowing sound, electromyography, and so forth have been proposed as a non-invasive and accessible method...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Xiong Li, Ce Wang, Xiaohua Huang, Tonghui Zhang, Xuefen Wang, Minghua Min, Lumin Wang, Hongliang Huang, Benjamin S Hsiao
The emergence of Steiner minimal tree is of fundamental importance, and designing such geometric structure and developing its application have practical effect in material engineering and biomedicine. We used a cutting-edge nanotechnology, electrospinning/netting, to generate a Steiner geometrical poly(vinylidene fluoride) (PVDF) nanofiber/nanonet filter for removing airborne particulate matter (PM). Manipulation of surface morphologies by precise control of charged situation enabled the creation of two-dimensional nanonets with Steiner geometry...
November 28, 2018: ACS Applied Materials & Interfaces
Vasiliki Karanikola, Chanhee Boo, Julianne Rolf, Menachem Elimelech
Membrane distillation (MD) is an emerging thermal desalination process, which can potentially treat high salinity industrial wastewaters, such as shale gas produced water and power plant blowdown. The performance of MD systems is hampered by inorganic scaling, particularly when treating hypersaline industrial wastewaters with high-scaling potential. In this study, we developed a scaling-resistant MD membrane with an engineered "slippery" surface for desalination of high-salinity industrial wastewaters at high water recovery...
November 28, 2018: Environmental Science & Technology
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