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Superhydrophobic Membrane

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
Haesung A Lee, Yanfei Ma, Feng Zhou, Seonki Hong, Haeshin Lee
Various methods have been developed in surface chemistry to control interface properties of a solid material. A selection rule among surface chemistries is compatibility between a surface functionalization tool and a target material. For example, alkanethiol deposition on noble metal surfaces, widely known as the formation of a self-assembled monolayer (SAM), cannot be performed on oxide material surfaces. One must choose organosilane molecules to functionalize oxide surfaces. Thus, the surface chemistry strictly depends on the properties of the surface...
March 5, 2019: Accounts of Chemical Research
Hemalatha Parangusan, Deepalekshmi Ponnamma, Mohammad K Hassan, Samer Adham, Mariam Al Ali Al-Maadeed
Carbon-based materials are outstanding candidates for oil spill clean-ups due to their superhydrophobicity, high surface area, chemical inertness, low density, recyclability, and selectivity. The current work deals with the fabrication of membrane oil absorbents based on carbon nanotube (CNT) reinforced polystyrene (PS) nanocomposites by electrospinning technique. The spun membranes are also irradiated with the gamma radiation to induce enough crosslinks and thus good polymer-filler interactions. The structural, morphological, and surface properties in addition to the oil/water separation efficiency were investigated by varying the concentration of CNT and the dose of γ-irradiation...
February 28, 2019: Materials
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
Di Zhang, Xin-Zheng Jin, Ting Huang, Nan Zhang, Xiao-Dong Qi, Jing-Hui Yang, Zuo-Wan Zhou, Yong Wang
Developing highly efficient and multi-functional membranes toward oil adsorption and oil/water separation is of significance in oily wastewater treatment. Herein, a novel electrospun composite membrane with dual-scaled porous structure and nano-raised structure on each fiber was fabricated through electrospinning using biodegradable polylactide (PLA) and magnetic γ-Fe2O3 nanoparticles. The PLA/γ-Fe2O3 composite membranes show high porosity (>90%), superhydrophobic and superlipophilic performances with CH2I2 contact angle of 0o, good water adhesion ability like water droplet on petal surface, excellent anti-icing performance and good mechanical properties with a tensile strength of 1...
January 14, 2019: ACS Applied Materials & Interfaces
Miaomiao Zhu, Ranhua Xiong, Chaobo Huang
Air pollution is becoming more and more severe especially in developing countries. It is urgent to seek an effective protection for the unacceptable levels of the air pollution. Up to date, the air filtration is a widely used method to protect us from the air pollution. However, most of the air filtration membranes in fabrication process is required to use harmful organic solvents. Here, we report a human friendly, multifunctional and bio-based chitosan/poly (vinyl alcohol) air filtration membrane via green electrospinning and UV-cured...
February 1, 2019: Carbohydrate Polymers
Michael Z Hu, Chaiwat Engtrakul, Brian L Bischoff, Mi Lu, Mussie Alemseghed
Surface wettability-tailored porous ceramic/metallic membranes (in the tubular and planar disc form) were prepared and studied for both vapor-phase separation and liquid pervaporative separations of water-ethanol mixtures. Superhydrophobic nanoceramic membranes demonstrated more selective permeation of ethanol (relative to water) by cross-flow pervaporation of liquid ethanol⁻water mixture (10 wt % ethanol feed at 80 °C). In addition, both superhydrophilic and superhydrophobic membranes were tested for the vapor-phase separations of water⁻ethanol mixtures...
October 12, 2018: Membranes
Xiaoying Qiao, Chunyan Yang, Qian Zhang, Shengke Yang, Yangyang Chen, Dan Zhang, Xiaoyu Yuan, Wenke Wang, Yaqian Zhao
In order to prepare parabolic superhydrophobic materials, copper meshes were used as the substrate and ultrasonic etching and oxidative corrosion were carried out with FeCl₃ solution and H₂O₂ solution, respectively, and then the surface was modified with stearic acid (SA). The topological structure and surface wettability of the prepared mesh were characterized by fluorescence microscope, scanning electron microscopy and contact angle measurement. Finally, the as-prepared copper meshes were applied to oil-water separation...
October 9, 2018: Materials
Samuel Cheeseman, Stephanie Owen, Vi Khanh Truong, Denny Meyer, Soon Hock Ng, Jitraporn Vongsvivut, Denver Linklater, Mark J Tobin, Marco Werner, Vladimir A Baulin, Pere Luque, Richard Marchant, Saulius Juodkazis, Russell J Crawford, Elena P Ivanova
Dragonfly wings are of great interest to researchers investigating biomimetic designs for antiwetting and antibacterial surfaces. The waxy epicuticular layer on the membrane of dragonfly wings possesses a unique surface nanoarchitecture that consists of irregular arrays of nanoscale pillars. This architecture confers superhydrophobic, self-cleaning, antiwetting, and antibiofouling behaviors. There is some evidence available that suggests that lifestyle factors may have influenced the evolution of the wing nanostructures and, therefore, the resulting properties of the wings; however, it appears that no systematic studies have been performed that have compared the wing surface features across a range of dragonfly species...
June 30, 2018: ACS Omega
Navaladian Subramanian, Adnan Qamar, Ahmad Alsaadi, Adair Gallo, Muhammed Ghifari Ridwan, Jung-Gil Lee, Sreekiran Pillai, Sankara Arunachalam, Dalaver Anjum, Felix Sharipov, Noreddine Ghaffour, Himanshu Mishra
HYPOTHESIS: Direct contact membrane distillation (DCMD) processes exploit water-repellant membranes to desalt warm seawaters by allowing only water vapor to transport across. While perfluorinated membranes/coatings are routinely used for DCMD, their vulnerability to abrasion, heat, and harsh chemicals necessitates alternatives, such as ceramics. Herein, we systematically assess the potential of ceramic membranes consisting of anodized aluminum oxide (AAO) for DCMD. EXPERIMENTS: We rendered AAO membranes superhydrophobic to accomplish the separation of hot salty water (343 K, 0...
January 1, 2019: Journal of Colloid and Interface Science
Tao Fan, Qinghe Qian, Zhihui Hou, Yiping Liu, Ming Lu
Successful fabrication of smart membrane based on cellulose fabric for controllable oil/water separation was reported. Sheet hexagonal ZnO was in situ synthesized on surface of cellulose fibers using NaOH/urea and ZnCl2 aqueous solution which were also exploited to fix ZnO steadily due to their swelling and dissolving effects on cellulose. Reversible wettability transition between superhydrophobicity/superoleophilicity and superhydrophilicity/superoleophobicity underwater was manipulated easily by dipping into a lauric acid ethanol solution and NaOH/ethanol water solution in turn for 2min...
November 15, 2018: Carbohydrate Polymers
Chao Yang, Na Han, Weijing Wang, Wenxin Zhang, Changye Han, Zhenyu Cui, Xingxiang Zhang
Separation of emulsified water/oil mixtures is a worldwide concern. However, poor chemical and solvent resistance of general polymeric membranes limit these membranes for application in the separation process. In this study, a poly(phenylene sulfide) (PPS) porous membrane with a rough concave topographic feature was fabricated, which exhibited excellent superoleophilicity and under-oil superhydrophobicity. The membrane is capable of separating both surfactant-free and surfactant-stabilized emulsions with a high flux...
September 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Liang Cheng, Da-Ming Wang, Abdul Rajjak Shaikh, Li-Feng Fang, Sungil Jeon, Daisuke Saeki, Lei Zhang, Cui-Jing Liu, Hideto Matsuyama
Efficient treatment of difficult emulsified oil-water wastes is a global challenge. Membranes exhibiting unusual dual superlyophobicity (combined underwater superoleophobicity and underoil superhydrophobicity) are intriguing to realize high-efficiency separation of both oil-in-water and water-in-oil emulsions. For the first time, a robust polymeric membrane demonstrating dual superlyophobicity to common apolar oils was facilely fabricated via a simple one-step phase separation process using an aliphatic polyketone (PK) polymer, thanks to a conjunction of intermediate hydrophilicity and re-entrant fibril-like texture upon the prepared PK membrane...
September 12, 2018: ACS Applied Materials & Interfaces
Yingchao Dong, Lining Ma, Chuyang Y Tang, Fenglin Yang, Xie Quan, David Jassby, Michael J Zaworotko, Michael D Guiver
Membrane distillation (MD) is a promising process for the treatment of highly saline wastewaters. The central component of MD is a stable porous hydrophobic membrane with a large liquid-vapor interface for efficient water vapor transport. A key challenge for current polymeric or hydrophobically modified inorganic membranes is insufficient operating stability, resulting in some issues such as wetting, fouling, flux, and rejection decline. This study presents an overall conceptual design and application strategy for a superhydrophobic ceramic-based carbon nanotube (CNT) desalination membrane having specially designed membrane structures with unprecedented operating stability and MD performance...
August 13, 2018: Nano Letters
Wenjing Ma, Juntao Zhao, Olayinka Oderinde, Jingquan Han, Zhongche Liu, Buhong Gao, Ranhua Xiong, Qilu Zhang, Shaohua Jiang, Chaobo Huang
Marinepollution andindustrial wastewater have caused serious environmental pollution, thereby resulting into an alarming damage to public health in the past decades, hence the high demand for, cost effective, energy-efficient oil-water separation technologies for the removal of oil contaminants from such water. Herein, we report a facile method to fabricate superhydrophobic/superoleophilic membrane by immersing a polyimide (PI)-based nanofibrous membrane into a water/ethanol/ammonia/dopamine mixture, followed by modification with 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT)...
December 15, 2018: Journal of Colloid and Interface Science
Kang Liu, Zhi Huang, Ali Hemmatifar, Diego I Oyarzun, Jun Zhou, Juan G Santiago
Efficient water removal from a cool surface during condensation is critically important to the enhancement of a variety of heat transfer applications. Previous work has focused on the fabrication of superhydrophobic surfaces which promote water droplets and removal via droplet shedding or jumping. Here, we report a novel strategy with a droplet self-cleaning surface which spontaneously transports all of the droplets from the condensation surface to the back side. We fabricate the self-cleaning surface by simply tailoring the wettability of the two sides of a porous membrane and demonstrate that the hydrophobic side is effective in clearing off droplets of a wide range of diameters...
August 8, 2018: ACS Applied Materials & Interfaces
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 postmodifying 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...
August 22, 2018: ACS Applied Materials & Interfaces
Tiantian Li, Fu Liu, Shaofei Zhang, Haibo Lin, Jianqiang Wang, Chuyang Y Tang
Janus membranes with asymmetric wettability have attracted intense attention in oil/water separation, membrane distillation, liquid/fog collection, liquid diode, etc. Facile manipulation of the paradoxical wetting/antiwetting property on opposite surfaces of a 2D membrane is challenging. Different from most postmodification methods, herein, we propose one single-step unidirectional segregation strategy to fabricate a polymeric Janus membrane with extremely opposite wetting surfaces showing almost a 150° contact angle difference for the first time...
July 25, 2018: ACS Applied Materials & Interfaces
Mohamed Khayet, Rong Wang
The electrospinning technique was used successfully to fabricate nanofibers of polysulfone (PSF) in which polytetrafuoroethylene nanoparticles (PTFE NPs) were embedded. The size of the PTFE NPs is only 1.7 to 3.6 times smaller than the nanofiber diameter. The transition from hydrophobic to superhydrophobic character of the bead-free PSF electrospun nanofiber mats occurred with a PTFE NPs loading in the range 12-18% of the PSF weight. Transmission electron microscopy images revealed protruding nanosized asperities on the fiber surface due to the embedded PTFE NPs in the PSF matrix...
July 18, 2018: ACS Applied Materials & Interfaces
Xiaoxia Ye, Le Ke, Yaping Wang, Kaiyang Gao, Yiwen Cui, Xiaoling Wang, Xin Huang, Bi Shi
Superhydrophobic materials hold great promise in emulsion separation, but they have inherent mechanical weakness and are ineffective to separate mixed surfactant-stabilized emulsions. Herein, we combined the adhesion ability of polyphenol-Fe3+ bis-complexes with the high mechanical strength of carbon nanotubes (CNTs) to construct a mechanically robust and superhydrophobic coating on a collagen fiber membrane (CFM). We demonstrated that both CNTs and polyphenolic complexes competed with the surfactants adsorbed onto the emulsion droplets, serving as efficient demulsifiers to various mixed surfactant-stabilized emulsions...
August 1, 2018: Chemistry: a European Journal
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