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Superhydrophobic Membrane

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...
August 15, 2018: ACS Applied Materials & Interfaces
Yingchao Dong, Lining Ma, Chuyang Y Tang, Fenglin Yang, Xie Quan, David Jassby, Michael J Zaworotko, Michael Dominic 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 7, 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)...
June 25, 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 10, 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...
June 14, 2018: Chemistry: a European Journal
Minxiang Zeng, Pingmei Wang, Jianhui Luo, Baoliang Peng, Bin Ding, Lecheng Zhang, Ling Wang, Dali Huang, Ian Echols, Ehab Abo Deeb, Eric Bordovsky, Chang-Hyun Choi, Carlos Ybanez, Patricia Meras, Evan Situ, M Sam Mannan, Zhengdong Cheng
We demonstrate a facile route to in situ growth of lyotropic zirconium phosphate (ZrP) nanoplates on textiles via an interfacial crystal growing process. The as-prepared hybrid membrane shows a hierarchical architecture of textile fibers (porous platform for fluid transport), ZrP nanoplatelets (layered scaffolds for chemical barriers), and octadecylamine (organic species for superhydrophobic functionalization). Interestingly, such a hybrid membrane is able to separate the oily wastewater with a high separation efficiency of 99...
July 5, 2018: ACS Applied Materials & Interfaces
Hu Zhou, Miaoxin Zhang, Chang Li, Chunlei Gao, Yongmei Zheng
Inspired by a cactus spine and trichomes integrated fog collection system, a strategy is presented to design a micro/nanostructured conical spine and Janus membrane integrative system (MNCS+JM). In this strategy, the surface of conical spine can be covered with rough micro and nanostructure (MNCS), so that the tiny fog-droplets can be captured, coalesced, and transported. Janus membrane (JM) with inside hydrophobic surface and outside hydrophilic surface is further used to control the water collection in process of droplet transport when the Janus membrane is vertically placed with different positions on the MNCS, thus MNCS+JM propel the droplet continuously for transport-coalescence-transport in a circle of droplet transport and collection...
July 2018: Small
Mohammad Rezaei, David M Warsinger, John H Lienhard V, Mikel C Duke, Takeshi Matsuura, Wolfgang M Samhaber
Membrane distillation (MD) is a rapidly emerging water treatment technology; however, membrane pore wetting is a primary barrier to widespread industrial use of MD. The primary causes of membrane wetting are exceedance of liquid entry pressure and membrane fouling. Developments in membrane design and the use of pretreatment have provided significant advancement toward wetting prevention in membrane distillation, but further progress is needed. In this study, a broad review is carried out on wetting incidence in membrane distillation processes...
August 1, 2018: Water Research
Manxiang Wang, Guicheng Liu, Hyunjin Yu, Sang-Hyup Lee, Lei Wang, Jianzhong Zheng, Tao Wang, Yanbin Yun, Joong Kee Lee
The vacuum membrane distillation (VMD) is a promising technology for lots of applications. To solve the membrane fouling and wetting problems, in this paper, a novel ZnO nanorods 1 H,1 H,2 H,2 H-perfluorodecyltriethoxysilane (PDTS) modified poly(vinylidene fluoride) (PVDF) membrane with a micro/nanoscale hierarchical structure and a superhydrophobic surface has been prepared and applied to the VMD process for distilling highly salty water, for the first time. Among these, a pyrolysis-adhesion method is created to obtain the ZnO seeds and fasten them on the PVDF substrate firmly...
April 25, 2018: ACS Applied Materials & Interfaces
Deke Li, Xuelian Gou, Daheng Wu, Zhiguang Guo
The wide application of superhydrophobic membranes has been limited due to their complicated preparation technology and weak durability. Inspired by the mechanical flexibility of nanofibrous biomaterials, nanofibrils have been successfully generated from Kevlar, which is one of the strongest synthetic fibers, by appropriate hydrothermal treatment. In this study, a robust superhydrophobic PDMS/PVDF@KNFs membrane is prepared via a simple one-step process and subsequent curing without combination with inorganic fillers...
April 5, 2018: Nanoscale
Fan Yang, Johnson E Efome, Dipak Rana, Takeshi Matsuura, Christopher Lan
Among other applications, metal-organic frameworks (MOFs) are slowly gaining grounds as fillers for desalination composite membranes. In this study, superhydrophobic poly(vinylidene fluoride) nanofibrous membranes were fabricated with MOF (iron 1,3,5-benzenetricarboxylate) loading of up to 5 wt % via electrospinning on a nonwoven substrate. To improve the attachment of nanofibers onto the substrate, a substrate pretreatment method called "solvent basing" was employed. The iron content in the nanofiber, measured by energy-dispersive X-ray spectroscopy, increased proportionally with the increase of the MOF concentration in the spinning dope, indicating a uniform distribution of MOF in the nanofiber...
April 4, 2018: ACS Applied Materials & Interfaces
Mengying Long, Shan Peng, Wanshun Deng, Xinrui Miao, Ni Wen, Qiannan Zhou, Wenli Deng
HYPOTHESIS: Surface energy gradient would generate an imbalance force to drive tiny water droplets in dry air from the hydrophilic bumps to superhydrophobic domains, which has found on the Stenocara beetle's back. EXPERIMENTS: Inspired by this phenomenon, we introduced a pristine superhydrophilic filter paper on the lower surface energy superhydrophobic filter paper. ZnSn(OH)6 particles and polydimethylsiloxane were mixed to prepare the superhydrophobic coating, and the coating was spray-coated on the poly(dialkyldimethylammonium chloride) covered filter paper to separate the span 80 stabilized water-in-isooctane emulsion...
June 15, 2018: Journal of Colloid and Interface Science
Long-Fei Ren, Mister Adeel, Jun Li, Cong Xu, Zheng Xu, Xiaofan Zhang, Jiahui Shao, Yiliang He
Phenol recovery from phenol-laden saline wastewater plays an important role in the waste reclamation and pollution control. A membrane aromatic recovery system-like membrane contactor (MARS-like membrane contactor) was set up in this study using electrospun polydimethylsiloxane/polymethyl methacrylate (PDMS/PMMA) membrane with 0.0048 m2 effective area to separate phenol from saline wastewater. Phenol and water contact angles of 0° and 162° were achieved on this membrane surface simultaneously, indicating its potential in the separation of phenol and water-soluble salt...
May 15, 2018: Water Research
Mustafa Mohammed Aljumaily, Mohammed Abdulhakim Alsaadi, Rasel Das, Sharifah Bee Abd Hamid, N Awanis Hashim, Mohamed Khalid AlOmar, Haiyam Mohammed Alayan, Mikhail Novikov, Qusay F Alsalhy, Mohd Ali Hashim
Demand is increasing for superhydrophobic materials in many applications, such as membrane distillation, separation and special coating technologies. In this study, we report a chemical vapor deposition (CVD) process to fabricate superhydrophobic carbon nanomaterials (CNM) on nickel (Ni)-doped powder activated carbon (PAC). The reaction temperature, reaction time and H2 /C2 H2 gas ratio were optimized to achieve the optimum contact angle (CA) and carbon yield (CY). For the highest CY (380%) and CA (177°), the optimal reaction temperatures were 702 °C and 687 °C, respectively...
February 9, 2018: Scientific Reports
Zhigao Zhu, Yuanren Liu, Haoqing Hou, Wenxin Shi, Fangshu Qu, Fuyi Cui, Wei Wang
Water flux and durability are the two critical parameters that are closely associated with the practical application of membrane distillation (MD). Herein, we report a facile approach to fabricate superhydrophobic polyimide nanofibrous membranes (PI NFMs) with hierarchical structures, interconnected pores, and high porosity, which was derived from the electrospinning, dual-bioinspired design, and fluorination processes. Bioinspired adhesive based on polydopamine /polyethylenimine (PDA/PEI) composite was first linked onto membrane substrates and then assembled lotus leaf hierarchical structure by binding the negatively charged silica nanoparticles (SiO2 NPs) via electrostatic attraction...
March 6, 2018: Environmental Science & Technology
Pengrui Jin, Chuan Huang, Jiaxiang Li, Yadong Shen, Liao Wang
The wetting of hollow fibre membranes decreases the performance of the liquid-gas membrane contactor for CO2 capture in biogas upgrading. To solve this problem, in this work, a poly(vinylidene fluoride) (PVDF) hollow fibre membrane for a liquid-gas membrane contactor was coated with a superhydrophobic layer composed of a combination of hydrophobic SiO2 nanoparticles and polydimethylsiloxane (PDMS) by the method of spray deposition. A rough layer of SiO2 deposited on the PVDF membrane resulted in an enhanced surface hydrophobicity...
November 2017: Royal Society Open Science
Yong Sung You, Seongchan Kang, Rodolphe Mauchauffé, Se Youn Moon
Oil-water separation is a worldwide challenge because of the increasing production of industrial oily wastewater and frequent oil spills. The growing environmental and economic demands emphasize the need to develop effective solutions to separate oil and water. Recently, oil-water separation methods were developed by tuning the wettability of membranes via surface functionalization. However, the industrialization of such methods remains challenging due to the easy-fouling, high cost and complex fabrication...
November 10, 2017: Scientific Reports
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