ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Xi Li,Huachun Lan,Gong Zhang,Xiao Tan,Huijuan Liu
Oily wastewater treatment has been restricted by the existence of stable oil-in-water (O/W) emulsions containing micrometer-sized oil droplets. However, the strong adhesion and stacking of emulsified oil droplets on the surface of current separation media cause serious fouling of the treatment unit and the rapid decline of treatment efficiency. Herein, a novel flow-through titanium (Ti) electrode-based filtration device with remarkable oil droplet rejection property was well designed for the continuously separating O/W emulsion. In contrast to the pristine Ti foam, the permeance of the TiO2 nanoarray-coated Ti foam (NATF) increased from 2538 to 4364 L m–2 h–1 bar–1 through gravity-driven flow. Further, more than ∼70% permeability can be maintained after 6 h of O/W emulsion filtration using the current device, the value of which was markedly higher than that of conventional oil/water separation filters (less than 5%). According to the results of wettability test, the super-oil-repellent surface endowed by this nanoarray structure primarily avoided the formation of a compact oil fouling layer. When the voltage was applied, accompanied by the electrophoresis effect, redistribution of surfactant molecules on the surface of oil droplets induced by an electric field made them readily captured by the microbubbles continuously generated from the electrode, thereby rapidly migrating these bubble-adhered oil droplets far from the filtration medium.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lingyu Sun,Yu Wang,Xiaoxuan Zhang,Feika Bian,Luoran Shang,Yuanjin Zhao,Weijian Sun
Functional materials with specific wettability have broad technological implications in various fields. Herein, inspired by the rapid replenishment of Nepenthes nectaries, we present novel lubricant infused hierarchical porous surfaces with self-replenishing and self-reporting capacities. As the porous surfaces were replicated from colloidal co-assembly templates, they were composed of an inverse opal nano-porous structured outer surface layer to lock the lubricant and maintain the surface stability, together with an embedded macro-porous network as reservoirs to store and supply the lubricant for self-healing. We have demonstrated that the hierarchical inverse opal films are in possess of liquid-repelling feature on liquids with different surface tensions (22.3 mN/m to 72.8 mN/m) and favorable self-replenishment capacity for stable droplet manipulation. In addition, the structural colors arisen from the periodic nanostructure could serve as an optical indicator to monitor the wettability of the resultant slippery surfaces, thus greatly expanding their practical values. These features make the self-replenishing slippery surfaces ideal candidates for various applications such as optical sensing, fluid transportation, medical self-cleaning, and so on.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Junchao Zhao,Zhitao Yin,Muhammad Usman Shahid,Haoran Xing,Xudong Cheng,Yangyang Fu,Song Lu
The re-ignition of pool fires is a common hazard phenomenon in fire extinguishing. Dry chemicals with oleophobicity may solve this problem because powders can float on the oil surface and prevent evaporation of fuel pool. In this research, MAPP (modified ammonium polyphosphate) with superhydrophobicity, oleophobicity, and higher chemical activity is prepared which can quickly quench pool fires and provide longer protection. The activation indexes of MAPP for water, diesel , aviation kerosene and gasoline are 98.5%, 87.4%, 98.7% and 98.4%, respectively. Lower activation energy of MAPP means that it will show higher chemical activity in fire. The fire-extinguishing performance of MAPP is much higher than that of Commercial UDCA (ultra-fine dry chemical agent) during fire experiments. After extinguished by MAPP, the fuel pool is hard to be re-ignited. The significance of this study is to propose a new strategy for preventing the re-ignition of pool fires.
研究领域:
材料科学
·
消防工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2019
·Vol. 15
·期 47
·9727-9732
·
IF 3.399
Guanzhou Luo,Li Wang,Xinying Li,Kai Yang,Yongle Luo,Shouping Xu,Pihui Pi,Xiufang Wen
A facile method that combines alkali-assisted oxidation and –SH chelation with a click chemistry reaction was employed to create an F-POSS polymer surface (fluorinated octavinyl polyhedral oligomeric silsesquioxane polymer)-based Cu mesh (F-POSS-OM). The as-prepared F-POSS-OM surface displayed a cohering hierarchical nano-F-POSS polymer granule/micro-Cu(OH)2 wire structure, which provided a re-entrant geometry needed for liquid-repellency and low liquid sliding angles (<15°). Moreover, the easy-prepared structure endows the F-POSS-OM with remarkable durability for mechanical and chemical damages, including wear abrasion, tape-peeling, 100 cm-height hammer impact, severe hand twisting, strong acid/base/salt solutions, and high temperatures. Importantly, F-POSS-OM still retained excellent self-cleaning performance even after being subjected to these damages.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Shanshan Wang,Chaohu Xiao,Shun Lu,Haijing Lu,Qi-Meige Hasi,Yuhan Zhang,Xingping Luo,Lihua Chen
Solar steam generation (SSG) is an effective way to mitigate the freshwater crisis. However, challenges still remain in scalable preparation, cost-effectiveness, and expanding the scope of practical applications for photothermal materials. Herein, a biomass-based solar steam generator (named OR-INP) with salt-resistant, oil-repellent, and anti-fouling performances is fabricated by grafting poly(ionic liquid)s onto celluloses from waste newspapers and then conducting oil-repellent modification. Benefiting from the broad solar absorption in the wet state (ca. 92%), low thermal conductivity (0.1108 W m–1 K–1), and strong hydrophilic and oleophobic properties, the solar evaporation efficiency is as high as 93.25% for pure water, 84.96% for 20 wt % NaCl, and 78.46% for 5 wt % oily wastewater, under 1 sun irradiation. Moreover, the aerogel still has excellent purification effects on solutions which contain organic dyes, heavy metal ions, or bacteria. Therefore, combining the merits of salt resistance, oil repellency, and wastewater treatment, this work develops the prospect of employing waste biomass resource-based photothermal materials and expands the practical application range of biomass-based evaporators.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Mengyang Cong,Fei Wang,Yuliang Zhang,Longjie Xie,Yanhua Lei,Kai Sun,Lihua Dong
Desalination of seawater using solar energy is an effective and environmentally friendly means to solve the chronic freshwater shortage problem. However, the low conversion rate of solar energy seriously affects the application of solar energy in the field of solar thermal conversion . In this regard, we present polydopamine (PDA) loaded woods with an array structure as solar interfacial evaporators for high-efficiency solar vapor generation. It was found that the solar interfacial evaporators made of PDA/wood composites demonstrated excellent solar absorption rate (up to 93%) and the highest solar vapor generation efficiency of 97.6% under one solar illumination. It is worth mentioning that in the simulated seawater experiments, the array structure showed outstanding salt-rejected performance in 3.5% and 20% NaCl solutions, mightily thanks to the original microporous channels of the wood and the artificial millimeter cut marks. Based on the above conditions, the efficiency of PDACW-7 × 7 in simulated seawater with different salinities (3.5 and 20 wt%) under 1 kW m −2 irradiation remained at about 96.1% and 81.9%. Therefore, due to the high light absorption rate and low cost, PDA/wood composites could have good prospect in the field of solar thermal conversion and seawater desalination.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Shuai Luo,Xiao-Xi Peng,Yun-Fei Zhang,Ping Fu,Fei-Peng Du
In order to improve the oil-repellent and antifouling ability of the antifog coatings, a poly(vinyl alcohol)/hydrolyzed poly (styrene-co-maleic anhydride)/fluorocarbon surfactant (PVA/H-PSMA/FC) was prepared by incorporating a fluorocarbon surfactant into PVA/H-PSMA via hydrogen bonds. The microstructure, antifog and oil-repellent properties were investigated in our study, and the results indicate that the strong interaction between the PVA/H-PSMA and the FC provides a good fixation for the FC inside or on the surface of the coatings. The water contact angle (WCA) ranges from 59° to 69° and the oil contact angle (OCA) ranges from 35° to 50°, which means that the PVA/H-PSMA/FC coatings are hydrophilic and oleophilic. The results also demonstrate that the prepared PVA/H-PSMA/FC coating exhibits excellent antifog properties and high transparency. Moreover, the oil droplets may slip off the coating surface without any residue and the glide angle is below 12°. A low content of FC loaded creates a large space between FC molecules, thus providing enough hydrophilicity on the PVA/H-PSMA surface and achieving excellent antifog performance. Meanwhile, the mobile fluorinated alkyl chains on the surface can be reorganized and act as “slides” to easily move oil droplets at low TA, providing oil repellency. The excellent oil-repellency makes the transparent PVA/H-PSMA/FC antifog coatings have potential application prospects in the field of surface protection of optical equipment and solar panel.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 1
·1-11
·
IF 6.048
Wang Xiaoying,Zhang Haiguang,Wang Xu,Chen Shuo,Yu Hongtao,Quan Xie
Reduced graphene oxide (RGO) membranes are theoretically more conducive to the rapid transport of water molecules in their channels compared with graphene oxide (GO) membranes, as they have fewer oxygen-containing functional groups and more non-oxidized regions. However, the weak hydrophilicity of RGO membranes inhibits water entry into their channels, resulting in their low water permeability. In this work, we constructed wettable RGO-MXene channels by intercalating hydrophilic MXene nanosheets into the RGO membrane for improving the water permeance. The RGO-MXene composite membrane exhibits high pure water permeance of 62.1 L/(m 2 ·h·bar), approximately 16.8 times that of the RGO membrane (3.7 L/(m 2 ·h·bar)). Wettability test results and molecular dynamics simulations suggest that the improved water permeance results from the enhanced wettability of RGO-MXene membrane and increased rate of water molecules entering the RGO-MXene channels. Benefiting from good conductivity, the RGO-MXene membrane with electro-assistance exhibits significantly increased rejection rates for negatively charged dyes (from 56.0% at 0 V to 91.4% at 2.0 V for Orange G) without decreasing the permeate flux, which could be attributed to enhanced electrostatic repulsion under electro-assistance.
研究领域:
材料科学
·
环境工程
·
膜分离技术
✓ 已验证
DOI
高影响因子
JOURNAL OF FORESTRY RESEARCH
·
2013
·Vol. 24
·期 4
·741-746
·
IF 0
Zhang Ming,Xu Yang,Wang Shu-liang,Shi Jun-you,Liu Chang-yu,Wang Cheng-yu
We improved the overall performance of fast-growing poplar by utilizing a low-cost, effective and simple method. The fast-growing poplar was modified by a vacuum-pressure impregnation method with three types of modification solutions composed of phenol-melamine-formaldehyde (PMF) co-condensed resin, diatomite, and 3-aminopropyl (diethoxy) methylsilane. We measured the weight percent gain (WPG), bulking, leaching, anti-swelling efficiency (ASE), water-repellent effectiveness (WRE), and oxygen index of the modified specimens. All of the wood physical properties, which are beneficial for human uses, were significantly improved by the treatment. We improved various characteristics of wood and the oxygen index of poplar above 48.6% after the modification using diatomite and PMF co-condensed resin.
研究领域:
材料科学
·
木材科学
·
复合材料
·
表面工程
·
高分子化学
✓ 已验证
DOI
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Shujing Zhao,Miaomiao Xia,Yuhan Zhang,Qi-Meige Hasi,Juanjuan Xu,Lihua Chen
Solar steam generation (SSG) has emerged as one of renewable and environmentally friendly technologies for production of fresh water . Here, we demonstrate the preparation of a novel oil-repellent photothermal materials based on copper foam (CF) for efficient SSG. Only by a simple chemical oxidation treatment on CF (named as R–CF), the smooth CF skeleton changes to be rough, leading to an enhanced light absorption of up to 90% which is far higher than that of untreated CF (10–70%). By combination of its high porosity (89.6%) and high specific surface area (230 m 2 g −1 ), the R–CF shows superior ability on SSG as well as salt-resistance, i.e., its evaporation efficiency in water and high saline solution reaches 85.25% and 70.19% under 1 kW m −2 irradiation, respectively. In addition, R–CF was further treated by a surface chemical modification to achieve hydrophilicity while oil-repellent wettability (named as OR-R-CF), enabling it solar vaporization even in oily water, e.g., an evaporation efficiency of 77.0% was obtained in oily water, which is great advantageous to those existing photothermal materials usually suffer the drawbacks of poor oil-repellent or anti-fouling property and thus shows significant potentials for practical SSG applications in both seawater and oily water.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
M. Xia,S. Zhao,Q.-M. Hasi,Y. Zhang,L. Li,L. Chen
Solar steam generation (SSG) has emerged as one of the most efficient strategies for desalination and sewage treatment. In this work, we present an approach for the fabrication of a novel oil-repellent solar photothermal material (named as O-WF-HNTs), which is derived from wood fibers (WF) and halloysite nanotubes (HNTs) for efficient SSG. The porosity of the premodified sample (WF-HNTs) was about 89%, the light absorption was over 95%, and the thermal conductivity was 0.206 W m −1 k −1 . Under the irradiation of 1.0 kW m −2 , the solar energy conversion efficiency reaches up to 84% with better salt tolerance (the evaporation efficiency in 10% NaCl solution is 76%). After a surface modification, interestingly, the wettability of the as-resulted O-WF-HNTs changes to be hydrophilic and oil-repellent. The solar energy conversion efficiency of the O-WF-HNTs can reach as high as 79% in oily water under 1.0 kW m −2 illumination, while the untreated sample, i.e. WF-HNTs, only shows a very low solar energy conversion efficiency of 48% due to n-hexadecane blocks the channels of material and in turn hinders water transportation during solar vaporization. Compared with the existing photothermal materials, which usually suffer the shortcomings of either complicated preparation or oleophilic property, our materials take the advantages of a simple, cost-efficient, and scalable fabrication process with low-cost natural clay and wood fibers as raw materials, in particular oil-repellency which makes it possible for SSG even in oily water or sewage, thus the practical application of SSG is further broadened.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NANO LETTERS
·
2021
·
IF 11.189
Yi Yang,Yachao Zhang,Yanlei Hu,Guoqiang Li,Cong Zhang,Yuegan Song,Longfu Li,Caiding Ni,Nianwei Dai,Yong Cai,Jiawen Li,Dong Wu,Jiaru Chu
Natural organisms can create various microstructures via a spontaneous growth mode. In contrast, artificial protruding microstructures are constructed by subtractive methods that waste materials and time or by additive methods that require additional materials. Here, we report a facile and straightforward strategy for a laser-induced self-growing mushroom-like microstructure on a flat surface. By simply controlling the localized femtosecond laser heating and ablation on the poly(ethylene terephthalate) tape/heat-shrinkable polystyrene bilayer surface, it is discovered that a mushroom-like architecture can spontaneously and rapidly grow out from the original surface within 0.36 s. The dimension of the re-entrant micropillar array (cap diameter, pillar spacing, and height) can be accurately controlled through the intentional control of laser scanning. Followed by a fluorination and spray coating, the obtained surface can realize the repellency and manipulation of oil droplets. This work provides new opportunities in the fields of microfabrication, microfluidics, microreactor engineering, and wearable antifouling electronics.
研究领域:
材料科学
·
微纳米技术
·
表面工程
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）