JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Wenting Zhou,Yuanmiaoliang Chen,Xiaojia He,Zhangxin Wang
Membrane wetting is an inevitable challenge in membrane distillation (MD). To overcome this challenge, a few dewetting techniques have been developed, but the reversibility of membrane wetting induced by various contaminants has not been well understood. Herein, we evaluate the reversibility of membrane wetting induced by different types of contaminants and elucidate the underlying mechanisms. From direct contact MD experiments and membrane wettability characterizations, membrane wetting induced by amphiphilic molecules, low-surface-tension liquids, and highly soluble salts can be easily reversed by 20-min DI water rinsing and oven drying, while to reverse membrane wetting induced by sparingly soluble salts, 3-h DI water rinsing and oven drying are required. Based on microscopic imaging and elemental mapping, the membrane wetting processes did not induce severe damage to membrane structure, and thus the hydrophobicity of the membrane can be restored after the contaminants were removed from the membrane. Furthermore, the mechanisms of the removal of different contaminants are elucidated. Specifically, after membrane rinsing and drying, the amphiphilic molecules automatically desorb from the dried membrane due to the disappearance of the underwater hydrophobic-hydrophobic interaction, while the low-surface-tension liquids leave the membrane pores because of evaporation. Additionally, during the membrane rinsing process, the highly soluble salts inside the membrane pores are dissolved, while the sparingly soluble salts detach from the membrane due to the hydrodynamic disturbance. The insights from this study shed lights on the development of effective dewetting techniques for hydrophobic membranes, which benefits not only MD but also membrane contactor applications.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hanpeng Gao,Siyu Chang,Yan Liu,Zong Meng,Zhiwu Han,Luquan Ren
Biomimetic surfaces that can manipulate droplets have attracted intense attention because of their application prospects in the fields of drug detection, cell sorting, bio-sensor, etc. Although many promising advances have been made, it is still a challenge to achieve lossless, no cross-contamination and on-demand controllable manipulation of underwater oil droplets without external energy input. Herein, SHI & SLIP interlaced wetting smart surfaces were fabricated by a simple strategy for manipulating underwater oil droplets. Depending on the switchable wettability and reasonable alternating wetting, the lubricant-infused area and superhydrophilic area can be on-demand controlled on the same surface. Numerical calculation and theoretical analysis reveal that the energy barrier between different interfaces is an important factor to realize underwater oil droplet manipulation. By the rational design of the interlaced wetting pattern, the capture, lossless transfer, fusion and directional transportation of underwater oil droplets were realized. Besides, the as-prepared surface has cross-contamination resistance, stable wettability and rewritability, which expands the application field and improves the potential value. We expect this work to open new avenues for flexible and controllable manipulation of underwater oil droplets and promote the development of smart microfluidic platform. It is also expected to be used in unpowered delivery systems, micro-reactions and energy transfer.
研究领域:
材料科学
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仿生学
·
微流控技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
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IF 5.9
Guangyu Zhang,Xin Zhang,Meng Li,Zhaohui Su
A strategy combining polyelectrolyte multilayer (PEM) deposition and counterion exchange was developed to fabricate wettability gradient surfaces on rough aluminum with wetting characters continuously varied from superoleophilic to superoleophobic. Counterion exchange kinetics was adopted as a means to tailor the surface chemical composition spatially, with the gradient ultimately reflecting position-dependent immersion time during the dipping of substrate in salt solution. Wettability depended on the identity and concentration of the counterion in the outermost PEM layer. Gradients could be erased and rewritten through the exchange of counterions, and the gradient’s wetting character was evaluated by measuring both water and oil contact angles. The surface chemical composition gradient was further investigated by X-ray photoelectron spectroscopy.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 48
·1906799
·
IF 15.621
Yong Qi,Wenbin Niu,Shufen Zhang,Suli Wu,Lin Chu,Wei Ma,Bingtao Tang
Combining responsive colloidal photonic crystals into invisible wettability patterns is important in steganography and watermarking for information encoding and decoding. Using a bilayer photonic crystal as a regionally functionalized porous carrier, a dual-responsive surface with tunable wettability, reversible switching between wetting and no wetting, and responsivity to pressure and solvents are reported. The mechanism of the design involves reversible switching of micropore shapes and optical diffraction in the fabricated periodic nanostructures, and uses the infiltration and capillary evaporation of fluids to realize the spectral diversity of reflectance. It generates different invisible wettability patterns that are regulated by induced pressure and the Donnan equilibrium osmotic pressure. Immersion of the sample in water induces the varying degrees of infiltration and immediately displays multiple colors. It enables instantaneously transparentizing the full infiltration parts of the top layer and simultaneously releasing the reflected light of the corresponding bottom layer. Moreover, those invisible patterns can be reset by wiping with ethanol. Multiple ways to encode and reveal invisible complex information can easily be realized due to these characteristics. This work opens a new avenue for encoding complex information in a single material platform and extends the design approach of invisible patterns for information coding.
研究领域:
材料科学
·
光学
·
信息加密
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Bio Materials
·
2018
·
IF 0
Chunping Su,Huiping Zhao,Hao Yang,Rong Chen
In this work, we developed a facile approach for the fabrication of stearic acid-modified starch/chitosan composite sponge with asymmetric wettability and gradient wettability via mediating the amount of starch. The starch/chitosan composite sponge exhibited heterogeneous wetting properties on its two surfaces after stearic acid modification. The superhydrophobic top surface with a water contact angle of 150° could prevent water, blood, and bacterial permeation without losing the breathability of the sponge, whereas the superhydrophilic bottom surface possessed optimal water and blood absorption and clotting abilities. The asymmetric wettability of starch/chitosan composite sponge was attributed to the synergistic contribution of gradient distribution of starch, rough three-dimensional skeleton structure induced capillary effect and the nonuniform surface distribution of hydrophilic/hydrophobic groups. Furthermore, the sponge also possessed good biodegradability and noncytotoxicity to the human normal hepatocyte. The results indicated that the stearic acid-modified starch/chitosan composite sponge with ideal liquid absorption, vapor transmission rate, self-cleaning and stain-repellent ability could be used as a promising candidate for wound dressing.
研究领域:
材料科学
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生物医学工程
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生物医药
✓ 已验证
产品关联
DOI
PubMed
ACS Applied Nano Materials
·
2025
·
IF 5.5
Wenting Kong,Hao Jia,Yan Zhao,Wen Xu
Smart membranes with adjustable superwettability are promising candidates for addressing complex challenges, such as treating oily domestic wastewater and industrial oil leakages. In this study, a durable superhydrophobic coating with switchable wettability was fabricated on a cotton fabric. The coated fabric exhibited a rapid transition to a superhydrophilic/underwater superoleophobic state via a “wetting-displacing” process, and can recover its original superhydrophobicity upon drying. The underwater–oil contact angle was further modulated by adjusting the ratio of the chemical components to the coating thickness. Inspired by the wettability pattern of the Stenocara beetle, an underwater superoleophobic/philic patterned fabric for efficient oi–water separation was developed. The influence of the wettability pattern geometry on the separation efficiency and flux was also investigated. The coated fabric was used to separate multiple types of oil/water mixtures with a separation efficiency of over 99%.
研究领域:
材料科学
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表面工程
·
环境功能材料
·
分离技术
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 8
·20006-20019
·
IF 5.19
Lin Qinghua,Hong Mei
Fractional wettability is common in the dense non-aqueous phase liquids (DNAPL) contaminated sites. However, it is still unclear how fractional wettability affects surfactant-enhanced DNAPL immiscible mobilization in saturated porous media. The macro-contact angle of the fractional wettability media was measured. The results of column experiments showed that the entrapped tetrachloroethene (PCE) saturations after sodium dodecyl benzene sulfonate (SDBS) flooding were lower in the media where NAPL-wet sand was present compared with those in water-wet media. In the media which contained 25% octadecyltrichlorosilane (OTS)-treated sand, the entrapped PCE saturations decreased to the minimum, and the decrease was much larger in fine sand media. The SDBS-enhanced PCE recoveries were jointly affected by fractional wettability, particle size, and interfacial tension (IFT). When NAPL-wet sand was present and SDBS concentration was just 0.125 g⋅L −1 , the SDBS-enhanced PCE recoveries increased significantly. As the SDBS concentration continues to increase to 0.5 g⋅L −1 , they only increased slightly. In the fine sand media, the SDBS-enhanced PCE recoveries were higher, and they increased more obviously with the increase of NAPL-wet sand fractions. The influence weight of fractional wettability on SDBS-enhanced PCE recoveries was the largest (47.09%) under the experimental conditions. These findings indicate that it is important to consider fractional wettability characteristics when establishing a DNAPL immiscible mobilization strategy, because it is not sufficient to consider only IFT reduction, especially in media with finer pore structures.
研究领域:
环境科学
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化学工程
·
水文地质学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-9
·
IF 5.479
Gao Jian Bang,Sann Ei Ei,Wang Xin Yu,Ye Cui,Liu Rui,Gao Zhong Feng
A pH-responsive superwettable chip is described whose surface can switch between superhydrophobic and superhydrophilic. It can be used for the visual detection of the prostate specific antigen (PSA) based on contact angle readout. Magnetic beads were modified with primary antibody against PSA. After immunobinding, gold nanoparticles loaded with secondary antibody labeled with glucose oxidase is added. On addition of glucose, gluconic acid is formed which causes a drop in the local pH value. This results in a wettability switch of the pH-responsive superwettable chip from hydrophobic to hydrophilic. Under the optimized conditions, PSA can be quantified with a 3.2 pg mL −1 limit of detection by analyzing the contact angle and the related color that changes from blue via orange to red. The method is applicable to PSA detection in serum samples and for visual classification by cancer patients and healthy persons. It is also suitable for color-blind and color-weak individuals. Conceivably, this kind of assay can be transferred to the determination of various kinds of other bioanalytes including nucleotide, proteins, and even of ions and small organic molecules, and thus is has a wide scope.
Schematic presentation of a pH-responsive superwettable chip coated with silica nanoparticles for the visual detection of prostate specific antigen (PSA) by reading the contact angle. The superwettable chip achieves reliable clinical detection of serum PSA from prostate cancer patients.
研究领域:
生物医学工程
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shengyou Wu,Shuaifei Zhao,Zhe Zhai,Yan Huang,Shiwei Liu,Hao Yang,Yuchao Zhao
Membrane distillation (MD) is a viable technology and potential candidate for desalination of hypersaline wastewater. Nevertheless, MD membranes with high flux and superior antiwetting ability face a significant challenge for realizing high-efficient desalination. Herein, polyvinylidene fluoride (PVDF) hydrophobic porous membranes are fabricated by non-solvent induced phase separation. The structure of PVDF membranes, such as pore type, size, porosity, and surface hydrophobicity, can be well tuned over a wide range via adjusting phase separation conditions. To enhance the robustness of PVDF membrane, hydrophobized halloysite nanotubes (HNTs) are blended for membrane fabrication. The enhanced mechanical strength of membrane increases wetting resistance via inhibiting pore deformation and LEP reduction during salt crystals growth. In the treatment of hypersaline wastewater (70 g∙L −1 ) containing 3 g∙L −1 CaCl 2 and 3 g∙L −1 Na 2 SO 4 via VMD, the HNTs/PVDF membrane with 50 wt% HNTs shows a high flux of 54 L∙m −2 ∙h −1 , over 99.99 % NaCl rejection, and outstanding stability for 100 h. Our work not only offers a novel strategy to enhance wetting resistance of MD membranes for hypersaline wastewater treatment, but also demonstrates that the mechanical strength of membranes also significantly influences antiwetting ability of MD membranes.
研究领域:
环境工程
·
材料科学
·
脱盐技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xiaoju Yan,Chengyu Yang,Cong Ma,Hui Tao,Shirong Cheng,Lin Chen,Guodong Wang,Xinping Lin,Chengzhi Yao
Membrane fouling and wetting limit the applications of membrane distillation (MD) for wastewater treatment , especially when treating the wastewater with a high concentration of low surface tension substances such as oil and surfactants. In this paper, virgin polyvinylidene fluoride (PVDF) membrane was modified by polydimethylsiloxane (PDMS) to enhance anti-wetting ability. Then a thin polydopamine (PDA) layer was coated as a reaction platform for further modification. Polyethyleneimine (PEI) was cross-linked with PDA to form a uniform and stable layer, through hydrogen bonds and electrostatic interaction to immobilize hydrophilic MXene, which formed a Janus MXene-PVDF membrane. The MXene layer was the key for superoleophobicity and high liquid entry pressure (LEP) of membrane, capable of mitigating membrane fouling and wetting when dealing with low surface tension wastewater (LSTW). From the experiments results, pristine PVDF membrane showed severe fouling and wetting with flux decline and salt leakage during treatment of LSTW (surfactants containing water, oil-in-water emulsion and sodium dodecyl sulfate stabilized oil-in-water emulsion). However, under the same conditions, the Janus MXene-PVDF membrane exhibited remarkably stable flux (9.3 kg m −2 h −1 , 9.1 kg m −2 h −1 , 10.2 kg m −2 h −1 ) and salt rejection (almost 99.9%) after 15 h operation. Excellent fouling and wetting resistance of MXene-PVDF membrane was mainly attributed to its superhydrophilic and superoleophobic top surface (in-air water contact angle: 30.2°, under-water oil contact angle: 169.9°) and hydrophobic substrate (in-air water contact angle: 130.8°), together with high LEP value (91.1 Kpa). This study provides a viable route to fabricated a Janus membrane with outstanding fouling and wetting resistance for LSTW, oily wastewater and it has great potential for sewage treatment in the future.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Geoenergy Science and Engineering
·
2022
·
IF 0
Jirui Zou,Xiang'an Yue,Weiqing An,Yu-Chun Fu,Lijuan Zhang
Pore wetting is significant for understanding fluid behaviour in porous media . Due to the lack of measurement techniques, pore wettability was estimated by using contact angles measured on flat plate. This results in that the effect of pore size on wettability is rarely studied. In this paper, the oil-water static contact angles in the silica microtubes with inner diameter (ID) range of 1–523 μm were measured by the cryo-Focused Ion Beam-Scanning Electron Microscopy (cryo-FIB-SEM) and optical microscope . The experimental results show that the oil (silicone oil, hexadecane) and water contact angles in the silica microtubes have the microscale wetting effect, that is the contact angles increase monotonically with the decrease of the microtubular ID. Moreover, the oil-water contact angle of water-filled first is always smaller than that of oil-filled first. The static pore contact angle of oil-water in a silica microtube is different from the contact angle on a silica plate. This paper adds to our current understanding of the pore scale wettability phenomenon in the porous media and provides us with an experimental method for measuring micron scale pore wettability.
研究领域:
石油工程
·
材料科学
·
表面科学
✓ 已验证
DOI
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·
IF 2.4
Chen Zhuo,Yu Binqi,Yao Tingfeng,Du Weitong,Ma Jianchao
The wettability and reaction behavior of mold flux with different basicity on TiN and TiO 2 substrates were investigated at up to 1400 °C by the sessile drop method, which can provide a theoretical basis for optimizing the composition of the mold flux for high Ti-bearing steel. As the basicity increased, the mold flux exhibited better wettability and a stronger interfacial reaction with TiN. Thus, it was easier to absorb the TiN inclusion in the order of CaO–SiO 2 -based flux (CS) > CaO–SiO 2 –Al 2 O 3 -based flux (CSA) > CaO–Al 2 O 3 -based flux (CA). Scanning electron microscopy coupled with energy-dispersive spectroscopy showed that the interfacial reaction was also related to basicity. There was a visible and regular interfacial reaction layer between TiN and CS and the CSA flux, which was produced by the redox reaction between the SiO 2 in the slag and the TiN substrate, whereas there was no interfacial reaction layer between TiN and the CA flux. As the basicity decreased, the mold flux exhibited better wettability and a stronger interfacial reaction with TiO 2 ; thus, it was easier to absorb the TiO 2 inclusion in the order of CA > CSA > CS. There was also a visible and regular interfacial reaction layer between TiN and the three fluxes, which was produced by the dissolution of TiO 2 and then reacted with CaO to generate CaTiO 3 .
研究领域:
冶金学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）