SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shufeng Li,Zhe Chen,Yinhua Yang,Zhihao Si,Pei Li,Peiyong Qin,Tianwei Tan
The hydrophobicity of porous particles is important for the performance of mixed-matrix membranes for pervaporation separation of n -butanol aqueous solution. Here, a strategy was proposed to further enhance the hydrophobicity of ZIF-8. ZIF-8 particles were first coated by polydopamine (PDA) to create chemically reactive surface and then modified with silane coupling agents n -propyltrimethoxysilane and n -octyltriethoxysilane. The water contact angles of the obtained P-ZIF-8@PDA and O-ZIF-8@PDA separately increased from 132.8° to 137.3° and 151.5°, which demonstrated a remarkable enhancement in hydrophobicity. The silane-modified ZIF-8 particles were subsequently incorporated into PDMS to fabricate mixed-matrix membranes, which exhibited an improved adsorption selectivity for butanol. The best membrane with 1 wt% loading (O-ZIF-8@PDA) exhibited a separation factor of 56 and butanol flux of 480.6 g m −2 h −1 for a 1.5 wt% butanol solution at 55 °C. The separation factor increased by 23% compared with that of a ZIF-8/PDMS membrane. Moreover, compared with those of a pure PDMS membrane, the separation factor and butanol flux increased by 34% and 85%, respectively. Thus, the strategy is an effective method to improve the PV performance of PDMS membranes for butanol separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 3
·1577-1593
·
IF 3.917
Jiang Yan,Liu Xiuyu,Yang Qiang,Song Xueping,Qin Chengrong,Wang Shuangfei,Li Kecheng
Abstract This study investigated effects of residual lignin on composition, structure and properties of cellulose fibrils and cellulose fibril-based films by comparing two groups of cellulose fibrils which contained different amounts of lignin (15% and 2%, respectively) but were similar in cellulose to hemicellulose ratio. The results showed that lignin affected the size and content of nanofibril in cellulose fibrils through initially delaying but ultimately facilitating the mechanical defibrillation. Due to higher thermal stability and strong UV absorption capability, lignin enhanced the thermal stability and UV blocking properties of cellulose fibril-based film. Hydrophobic lignin also improved the dewatering of cellulose fibrils and the hydrophobicity of cellulose fibril-based film. Lignin interfered with the interfibrillar hydrogen bonding and therefore increased the mesopore diameter of cellulose fibril network. Lignin acting as a cement in cellulose fibril-based film made the film with a more densely packed structure, a higher density and a smoother surface. However, lignin decreased the transparency of cellulose fibril-based film due to its chromophore groups and impaired the mechanical strength of cellulose fibril-based film through interfering with the interfibrillar hydrogen bonding. Graphical abstract
研究领域:
材料科学
·
植物学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2016
·
IF 2.76
Hao Li,Sirong Yu,Xiangxiang Han,Yan Zhao
Superhydrophobic surface has attracted great attention because of its potential applications. In this work, a facile method for fabrication of a superhydrophobic coating on pipeline steel surface is reported. A hierarchical structured coating with nanoflakes was fabricated via electrodeposition and solution-immersion, and then the coating achieved superhydrophobic with water contact angle about 157° and sliding angle around 3° after fluorination modification. The surface morphology and wettability changed with different experimental parameters were also investigated. The prepared superhydrophobic coating exhibited efficient self-cleaning and anticorrosion properties. Furthermore, the anti-scaling property of this superhydrophobic coating was confirmed since the CaCO 3 crystals on the superhydrophobic coating were mainly needlelike compared to the rhombohedral CaCO 3 crystals on the surface of steel substrate. This superhydrophobic coating maintained good long-term stability in air, and mechanical and thermal stability under certain environment. This superhydrophobic coating provided potential multifunctional applications, such as self-cleaning, corrosion resistance and anti-scaling properties, of deposition metal or alloy coating.
研究领域:
材料科学
·
表面工程
·
腐蚀科学
·
功能涂层
·
金属防护
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Nan Li,Sufeng Zhang,Yali Liu,Valentin Nica,Sergiu Coseri
Cellulose-based materials are currently considered prime candidates for replacing petrochemical plastics because they are biodegradable and cost-effective, while the insufficient hydrophobicity makes them fail to meet application demands, which is a primary issue to be addressed. This work developed a green, catalyst-free approach to prepare high-hydrophobicity amidated cellulose (ADC) by anchoring the COOH-containing oleic acid (OLA) onto NH 2 -containing aminated cellulose (AMC) via amide bonds. The unsaturated fatty acid tail provides a hydrophobic barrier in ADC films . The surface water contact angle of the ADC film reached 133° and remained above 110° for at least one hour. Subsequently, the ADC suspension was applied on the surface of paper from old corrugated container (P-OCC) by an impregnation approach to investigate the improvement of hydrophobic properties. The results showed that the hydrophobicity of P-OCC was increased by ADC, with the water contact angle reached to 132° from 0°. Noticeably, the tensile strength of the ADC impregnated P-OCC (A-POCC) also increased by 2 times. This indicates that with excellent hydrophobicity and mechanical strength , the ADC has great potential application in green functional coating materials.
研究领域:
高分子材料科学
·
表面与界面化学
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生物质功能材料
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绿色化学
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包装材料工程
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Jie Liu,Kexin Zhang,Xin Liu,Qiyong Xu,Weiyi Li
Despite being recognized as a promising technique for treating high salinity water, membrane distillation (MD) has been plagued by the scaling of sparingly soluble salts. The growth of crystals can not only create additional resistance to evaporating water at the feed-membrane interface, but also alter the hydrophobic network to bridge the feed and distillate (i.e., result in the phenomenon of wetting). When recognizing the uncertain behaviors of calcium sulfate (CaSO 4 ) scaling in MD, this study was motivated to ascertain whether the crystal-membrane interactions could be dependent on the variation in crystalline morphology. In particular, optical coherence tomography (OCT) was employed to characterize the scaling-induced wetting via a direct-observation-through-the-membrane (DOTM) mode, which mitigated the effects of developing an external scaling layer on resolving the crystal-membrane interactions. The improved in-situ characterization suggests that the crystalline morphology of CaSO 4 could be effectively regulated by varying the stoichiometry of crystallizing ions; the richness of calcium in the aqueous environment for crystallization would be in favor of weakening the crystal-membrane interactions. The stoichiometry-dependent growth of CaSO 4 crystals can be exploited to develop an effective strategy for preventing the hydrophobic network from being wetted or irreversibly damaged.
研究领域:
环境科学
·
膜科学与技术
·
化学工程
·
水处理技术
·
材料表征
·
结晶过程
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 29
·19457-19464
·
IF 4.493
Ganwei Zhang,Jiwen Hu,Yuanyuan Tu,Guping He,Fei Li,Hailiang Zou,Shudong Lin,Gonghua Yang
The diblock copolymer poly[2,2,2-trifluoroethyl methacrylate-r-styrene]-block-poly[(2-cinnamoyloxyethyl methacrylate)] [P(TFEMA-r-Sty)-b-PCEMA] was synthesized via atom transfer radical polymerization. The copolymer underwent self-assembly in TFEMA/CH2Cl2 to form spherical micelles. Photo-cross-linking of the PCEMA domains of these micelles yielded cross-linked nanoparticles. The cross-linked nanoparticles were subsequently cast from CH2Cl2/methanol solvent mixtures at methanol volume fractions of more than 30% to yield rough surfaces bearing small nanobumps on micron-sized aggregations that were connected together to form cross-linked nanoparticles. These surfaces were superhydrophobic with a water contact angle of 161 ± 1° and a sliding angle of 6 ± 1°. Spraying these nanoparticles onto substrates exhibiting microscale roughness, such as filter paper, by a traditional coating technique also created superhydrophobic surfaces. A thin layer of nanoscale spherical protrusions was observed on the microscale fibers of filter paper by scanning electron microscopy. The coated filter paper samples exhibited a water contact angle and a sliding angle of 153 ± 1° and 9 ± 1°, respectively.
研究领域:
高分子化学
·
材料科学
·
表面科学
·
纳米技术
·
功能材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiujuan Zhao,Yangyang Luo,Peixin Tan,Mingxian Liu,Changren Zhou
A high-performance oil-water separation device that built by environment-friendly materials is a promising strategy to solve water pollution problem. In this study, we developed an oil-water separation system with chitin/halloysite nanotubes (C/HNTs) composites. C/HNTs were crosslinked by epichlorohydrin and freeze-dried, then a porous sponge was formed. The C/HNTs sponge was modified to be hydrophobic via immersing into bromohexadecane ethanol solution. The surface structure, mechanical properties, microstructure, oil absorption and oil-water separation ability of the C/HNTs sponge were investigated. The addition of HNTs significantly increased the compressive strength of chitin sponge without influence on porous structure . IR spectra indicated the successful coating of bromohexadecane on the C/HNTs sponge surface, which enabled the hydrophobicity and lipophilicity of this construct. The inside construct of the C/HNTs sponges were full of interconnected pores, and the pore size ranged from 250 to 500 μm. The absorption capability for various oil and grease were measured, including methylbenzene, sunflower seed oil , carbon dichloride, n-hexane, chloroform and acetone. It is found that the total amount of chloroform absorbed by a C/HNTs sponge was ~11.23 times of the sponge's weight, and the absorption for hexane was ~3.94 times of the sponge's weight. The sponge also exhibited an excellent oil-water separation ability with as high as 98.7% separation efficiency. All the results suggested that the chitin/HNTs sponges with improved mechanical property would have a great potential in oil-water separation.
研究领域:
材料科学
·
环境工程
·
高分子化学
·
纳米复合材料
·
分离技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Xiuyong Chen,Jianhui Yuan,Jing Huang,Kun Ren,Yi Liu,Shaoyang Lu,Hua Li
This study aims to further enhance the anti-corrosion performances of Al coatings by constructing superhydrophobic surfaces. The Al coatings were initially arc-sprayed onto steel substrates, followed by deposition of polyurethane (PU)/nano-Al 2 O 3 composites by a suspension flame spraying process. Large-scale corrosion-resistant superhydrophobic PU/nano-Al 2 O 3 -Al coatings were successfully fabricated. The coatings showed tunable superhydrophilicity/superhydrophobicity as achieved by changing the concentration of PU in the starting suspension. The layer containing 2.0 wt.%PU displayed excellent hydrophobicity with the contact angle of ∼151° and the sliding angle of ∼6.5° for water droplets. The constructed superhydrophobic coatings showed markedly improved anti-corrosion performances as assessed by electrochemical corrosion testing carried out in 3.5 wt.% NaCl solution. The PU/nano-Al 2 O 3 -Al coatings with superhydrophobicity and competitive anti-corrosion performances could be potentially used as protective layers for marine infrastructures. This study presents a promising approach for fabricatiing superhydrophobic coatings for corrosion-resistant applications.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
·
海洋工程
·
高分子材料
·
金属涂层
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2013
·
IF 2.144
Ruiyong Wang,Xiaohui Kang,Ruiqiang Wang,Rui Wang,Huanjing Dou,Jing Wu,Chuanjun Song,Junbiao Chang
The interactions between trypsin and caffeine/theophylline were investigated by fluorescence spectroscopy , UV–visible absorption spectroscopy , resonance light scattering and synchronous fluorescence spectroscopy under mimic physiological conditions . The results revealed that the fluorescence quenching of trypsin by caffeine and theophylline was the result of the formed complex of caffeine–trypsin and theophylline–trypsin. The binding constants and thermodynamic parameters at three different temperatures were obtained. The hydrophobic interaction was the predominant intermolecular forces to stabilize the complex. Results showed that caffeine was the stronger quencher and bound to trypsin with higher affinity than theophylline .
研究领域:
生物化学
·
分子药理学
·
药物代谢
·
蛋白质-配体相互作用
·
光谱学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yan Liu,Hanpeng Gao,Shuyi Li,Zhiwu Han,Luquan Ren
Inspired by rose petals, a novel and facile method to prepare smart surface with controllable wettability for transfer and patterned storage of droplets was presented. The smart surface was obtained by alternately depositing PDDA and PSS on a copper substrate with mastoid structure prepared by laser processing. It was found that the wettability of the as-prepared copper surface can switch reversibly between superhydrophobic and superhydrophilic state. In addition, the as-prepared surface had excellent physical and chemical stability. In theory, our droplet storage platform can be processed into any size and shape to achieve different requirements for droplet storage. This study provides a simple route to fabricate bioinspired rewritable platform with reversibly switchable wettability for lossless transfer and patterned storage of droplets. It may be helpful for the development of the devices for droplet transfer and functionalized droplet storage. This method can also be applied to biodetection, microfluidic switching, and chemical microreaction.
研究领域:
表面科学
·
微流控
·
生物医学工程
·
功能材料
·
仿生学
·
分析化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Shuai Zhou,Xiang Zhou,Gazi Hao,Wei Jiang,Tianhe Wang
Modulation of the density (from 3.5 to 64 mg cm −3 ), hydrophobicity and oil-uptake capability of graphene aerogels in extensive ranges were achieved by reacting (3-Mercaptopropyl)trimethoxysilane (MPS) with graphene oxide solutions under heating. The reaction allowed a characteristic silicone substructure to be formed on graphene and joint the graphene layers firmly together. With the increase of MPS concentrations (≤ca. 0.2 vol%), the nano silicone polymer grown on graphene functioned as a “linker” and “spacer”, leading to a substantial decrease of the aerogel density. Because of the formation of silicone polymer and the characteristic nano-micro substructures on the backbones of graphene aerogels, the graphene aerogels exhibited a high hydrophobicity with the water contact angle consistently exceeding 142 degrees. Functionalized graphene aerogels with a density of 3.5 mg cm −3 were conveniently fabricated that displayed an extraordinary oil absorption capacity, 182 times for lubricating oil and 143 times for n-hexane of its own weight. Furthermore, the aerogels maintained their ultra-high absorption capability even after 20 absorption-distillation cycles, due to structural integrity held by the strong interfacial adhesion between graphene sheets and polymer chains of aerogels. This study offers a promising graphene aerogels and also provides a strategy for fabricating extra low dense functional materials.
研究领域:
材料科学
·
纳米科技
·
高分子化学
·
环境功能材料
·
表面与界面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2019
·
IF 3.571
Xu Xu,Fuhao Dong,Xinxin Yang,He Liu,Lizhen Guo,Yuehan Qian,Aiting Wang,Shifa Wang,Jinyue Luo
The absorbent materials synthesized from biosources with low cost and high selectivity for oils and organic solvents have attracted increasing attention in the field of oil spillage and discharge of organic chemicals. We developed a convenient surface-grafting method to prepare efficient and recyclable biobased aerogels from epoxidized soybean oil (ESO)-modified cellulose at room temperature. The porous network-like structure of the cellulose aerogel was still fully retained after undergoing hydrophobic modification with ESO. Moreover, the modified aerogels possessed excellent hydrophobicity with a water contact angle of 132.6°. Moreover, the absorbent ability of the hydrophobic cellulose aerogels was systematically assessed. The results showed that modified aerogels could retain more than 90% absorption capacity even after 30 absorption–desorption cycles, indicating that the ESO-grafted cellulose aerogels have practical applications in the oil–water separation from industrial wastewater and oil-leakage removal.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 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）