COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Zhipeng Li,Huaijie Yan,Fuqiang Zhang
The hydrophobic modification of montmorillonite significantly extends its potential applications across various industrial sectors. In this study, montmorillonite with controlled hydrophobicity was prepared based on Cu 2+ -exchanged montmorillonite by synergistic modification with perfluorodecyltrimethoxysilane and aliphatic amines. Our findings indicate that copper ion-exchange process not only increases the interlayer spacing of montmorillonite but also promotes the formation of antlerite crystals on its surface. The presence of interlayer water impedes the silanization process with perfluorodecyltrimethoxysilane, confining the grafting to the external surface of the clay. Consequently, this method can only increase the water contact angle (WCA) from 0° to 54.4°. Conversely, treatment with aliphatic amines removes interlayer water and establishes a hydrophobic structure on the internal surface, raising the WCA to 47.0°. Remarkably, the synergistic modification of perfluorodecyltrimethoxysilane and aliphatic amine resulted in a WCA of 157.3°. Further investigations demonstrated that adjusting the type and concentration of the aliphatic amines allows for precise control of WCA, enabling adjustments within the range of 54.4° to 157.3°. This study offers a viable approach for the controllable hydrophobic modification of montmorillonite.
研究领域:
材料科学
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表面化学
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产品关联
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 10
·1592
·
IF 2.972
Binbin Zhang,Weichen Xu,Qingjun Zhu,Shuai Yuan,Yantao Li
The massive and long-term service of 5083 aluminum alloy (AA5083) is restricted by several shortcomings in marine and industrial environments, such as proneness to localized corrosion attack, surface contamination, etc. Herein, we report a facile and cost-effective strategy to transform intrinsic hydrophilicity into water-repellent superhydrophobicity, combining fluorine-free chemisorption of a hydrophobic agent with etching texture. Dual-scale hierarchical structure, surface height relief and surface chemical elements were studied by field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), successively. Detailed investigations of the wetting property, self-cleaning effect, NaCl-particle self-propelling, corrosion and long-term behavior of the consequent superhydrophobic AA5083 surface were carried out, demonstrating extremely low adhesivity and outstanding water-repellent, self-cleaning and corrosion-resisting performance with long-term stability. We believe that the low cost, scalable and fluorine-free transforming of metallic surface wettability into waterproof superhydrophobicity is a possible strategy towards anti-contamination and marine anti-corrosion.Keywords:fluorine free;silanization;superhydrophobic;corrosion protection;self-cleaning
研究领域:
材料科学
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表面工程
·
腐蚀与防护
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DOI
PubMed
高影响因子
MATERIALS SCIENCE FORUM
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2020
·
IF 0
Yin Hong Ran,Shi Yong Sun,Ke Xuan Shen,Dao Yong Tan,Yu Hang Liu,Liu Li,Yu Quan Ren
Silylation, also known as silane grafting, is frequently used to organically modify montmorillonite (organo-Mt), which of properties were depended on the type of siloxane and intercalated interlayer structure of Mt, for construction of functional materials utilizing in a variety application of industry. We have synthesized organo-Mt using different siloxanes after Mt was firstly modified at three different surfactants of cationic cetyltrimethylammonium bromide (CTAB), anionic sodium oleate (So) and nonionic sorbitan monostearate (Span60) to identifying the effect of surfactants for silylation of Mt. The spectral and structural characters of the obtained products were characterized by a combination of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetry (TG), and contact angle analysis. The basal spacing of the organo-Mt increased with surfactants loading. We found that CTAB can significantly increase the spacing between layers of Mt from 1.55nm to 1.90nm, load more siloxane on Mt. The average contact angles of CTAB-Mt-APTES and CTAB-Mt-PTES were 69.9±0.3° and 80.7±0.3°, which could be more prone to the interlayer locking effect. Our study showed that the charge of surfactants has significant influence for silylation of Mt, resulting in the loading amount of silane, interlayer structure, and the surface wetting properties.
研究领域:
材料科学
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化学工程
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DOI
INDUSTRIAL CROPS AND PRODUCTS
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2025
·
IF 6.2
Jiye Teng,Tao Zhang,Hongbo Zhao,Peiling Zhang,Zhengzhe Wu,Zhiwei Chang,Ming Li,Chenjie Zhu
Developing lignin-based fillers for reinforcing rubber materials has been recently spotlighted. This work modified lignin via a simple amination and a silylation reaction in a one-pot two-step manner. The molecular structure of aminated lignin (LN) was verified using 2D-HSQC, XPS and elemental analysis. The following silylation on LN results in dual-functionalized lignin (LNSi). LN and LNSi show improved hydrophobicity, reduced Hansen solubility parameters and morphology of nanoparticles (<50 nm). Styrene-butadiene rubber (SBR) composites containing 40 phr of fillers were prepared through latex compounding. SBR-LNSi presents comparable tensile strength to the references with carbon black and silica, and enhanced hardness. These remarkable mechanical performances correlate with its high dispersity and affinity with SBR matrix, and the improved rigidity and structuredness due to the self-condensation of silanol groups. This study provides a proof-of-concept for designing lignin-derived fillers with superior reinforcing effect on rubber materials.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Bioresources and Bioprocessing
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2014
·Vol. 1
·期 1
·1-8
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IF 0
Ma Xiaolei,Cao Xuejun
Background Ursodeoxycholic acid is an important clinical drug in the treatment of liver disease. In our previous work, ursodeoxycholic acid was prepared by electroreduction of 7-ketolithocholic acid. The separation of ursodeoxycholic acid from the electroreduction product (47% ( w / w ) ursodeoxycholic acid) by silylation crystallization is described herein. Results N , N -dimethylformamide was used as the solvent, whereas hexamethyldisilazane was the reaction agent. The optimal material ratio of electroreduction product/ N , N -dimethylformamide/hexamethyldisilazane was found to be 1:10:2 ( w / v / v ). The reaction proceeded for 2 h at 60°C, and the corresponding silylation derivative was separated by crystallization and pure ursodeoxycholic acid was recovered by 5% acid hydrolysis at 50°C for 0.5 h. The maximum recovery and purity of ursodeoxycholic acid were 99.8% and 99.5%, respectively. Conclusion Ursodeoxycholic acid with high purity and high recovery can be prepared directly. The developed method offers a potential application for large-scale production of ursodeoxycholic acid.
研究领域:
药学
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有机化学
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DOI
PLoS One
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2016
·Vol. 11
·期 3
·e0151439
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IF 3.057
Jianhua Wang,Jessica X. H. Wong,Honoria Kwok,Xiaochun Li,Hua-Zhong Yu
In this paper, we present a facile and cost-effective method to obtain superhydrophobic filter paper and demonstrate its application for efficient water/oil separation. By coupling structurally distinct organosilane precursors (e.g., octadecyltrichlorosilane and methyltrichlorosilane) to paper fibers under controlled reaction conditions, we have formulated a simple, inexpensive, and efficient protocol to achieve a desirable superhydrophobic and superoleophilic surface on conventional filter paper. The silanized superhydrophobic filter paper showed nanostructured morphology and demonstrated great separation efficiency (up to 99.4%) for water/oil mixtures. The modified filter paper is stable in both aqueous solutions and organic solvents, and can be reused multiple times. The present study shows that our newly developed binary silanization is a promising method of modifying cellulose-based materials for practical applications, in particular the treatment of industrial waste water and ecosystem recovery.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
F.N. Li,Y. Li,H.W. Bao,H.X. Wang,F. Ma
Functionalized diamond is promising for biosensing applications due to its attractive properties. Hydroxyl terminated diamond (OH-diamond) surface with chemically functionalizable carboxyl groups is beneficial to silanization, which creating an amine termination is necessary to immobilize proteins and DNA. However, fabrication of high quality OH-diamond surface is still difficult. In this work, OH-diamond is obtained by hydroxide ion treatments in deionized water at high voltages up to 3000 V. The OH-diamond exhibited high intensity of singly oxidized C Ⅰ carbon bonds (C OH and C O C) and untraceable doubly oxidized C Ⅱ carbon bonds (C O or O C O), characterized by X-ray photoelectron spectroscopy measurements. Meanwhile, O H and C O stretching vibration was observed in the Fourier transform infrared spectra. Furthermore, silanizaiton is achieved by 3-aminopropyltriethoxysilane (APTES) on the OH-diamond surface via condensation reaction with surface C OH groups. In the end, the stability of OH-diamond surface was investigated by ReaxFF simulations and density function theory (DFT) calculations.
研究领域:
材料科学
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生物传感
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化学工程
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DOI
高影响因子
FIBERS AND POLYMERS
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2023
·Vol. 24
·期 3
·885-892
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IF 2.5
Du Qiuping,Yu Jiajing,Xu Xianlin,Xia Lei,Zhuang Xupin
Developing a reusable, low cost and biodegradable oil absorption material with high capacity remains a challenge. Herein, we demonstrate a facile and reliable methodology to construct a hydrophobic cellulose sponge from cellulose xanthate by regenerating cellulose and surface silanization using methyl trichlorosilane. The cellulose sponge presents high porosity of up to 87.46% which could be regulated with p-Toluenesulfonyl hydrazide. The sponge exhibits excellent structure stability, which could complete recovery from 90% compression strain and high durability (60 cycles at 90% stain). With a hydrophobic surface, it presents a high absorption capacity of over 30 times its weight for oils and organic solvents, indicating promising application in oil and water separation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2020
·
IF 5.006
Phyu Thin Wai,Pingping Jiang,Yirui Shen,Pingbo Zhang,Qian Gu
The efficient catalysts were designed to allow the entry and release of reactants and products into the mesoporous SBA-15 in which the active sites, peroxophosphotungstate, were entrapped by silylation with three different silylating agents (C 3 , C 5 , and C 8 arm). The as-prepared catalysts were characterized by elemental analysis, ICP analysis, TGA, XRD, N 2 adsorption/desorption, SEM, TEM, and FT-IR spectra. Their catalytic performances were tested for the epoxidation of soybean oil using different parameters such as temperature, H 2 O 2 to unsaturation molar ratio, catalyst loading and stirring speed. The resulting epoxidized soybean oil was analyzed qualitatively and quantitatively by FT-IR and 1 HNMR. The results confirmed that the catalyst silylated with C 8 arm is promising for the synthesis of epoxides of long-chain carbon and reusable at least three times without obvious decrease in activity. Moreover, use of H 2 O 2 oxidant and free of solvent in the epoxidation reaction are the main advantages of these catalysts.
研究领域:
催化化学
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材料科学
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绿色化学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2015
·Vol. 11
·期 1
·81-87
·
IF 0.789
Jianxian Zeng,Zhaohui Qian,Xuejun Zhang,Hu Zhou,Peng Zhang,Lianggang Yi,Jun Tian
A novel modified ceramic membrane (CM-SiO 2 -A) has been prepared with the depositing and grafting technologies for removal of Ni 2+ from aqueous solutions. Firstly, the silica was deposited onto the surface of initial ceramic membrane (CM) by using the in situ hydrolysis deposition method and activated to obtain the silanol groups. Then, 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane was grafted onto the silica layer to obtain the CM-SiO 2 -A. The CM-SiO 2 -A was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, Fourier transform-infrared spectroscopy, and thermogravimetric analysis. Further, the change of water flux and separation of Ni 2+ were studied by using the modified membrane. Results showed that the water flux of CM-SiO 2 -A was decreased by 84.79% compared with the CM. The CM-SiO 2 -A had a much higher total rejection rate of Ni 2+ (77.24%) than that of the un-grafted membrane (1.02%) at initial Ni 2+ concentration of 10 mg/L and exhibits the potential for separation of low concentration of Ni 2+ from aqueous solutions. Copyright © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 12
·45923
·
IF 1.86
Sujiao Cao,Fang Qiu,Chen Xiong,Xiaojun Wang,Gang Zhang,Shengru Long,Jie Yang
With polydopamine (PDA) acting as interlayer, combined with electrospinning technology and a silanization method, here a versatile method for fabricating a superhydrophobic PES/PDA/ODTS fibrous mat is reported. Scanning electron microscopy, attenuated total reflection Fourier transform infrared spectroscopy, and contact angle measurements were applied to characterize the morphologies and chemical composition changes of the prepared fibrous mats. Their separation ability for oil/water mixtures was measured by self-made instruments. The results show that the fabricated PES/PDA/ODTS fibrous mat displays a water contact angle too large to be assessed by the ordinary amount of water applied in a conventional measurement. In other words, a water drop of less than 10 μL adheres to the syringe needle and leaves with it during the measurement. The prepared PES/PDA/ODTS fibrous mat also shows a threshold sliding angle no more than 2.5°. At the same time, this kind of material exhibits superoleophilicity for organic solvents, such as n -hexane, gasoline, toluene, and chloroform. The experimental contact angles were also analyzed using the Cassie–Baxter model to gain insights into the fundamental microstructure–wetting property relationship. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45923.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Advances
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2024
·
IF 5.5
Qingheng Wu,Yimeng Cai,Ke Xu,Dan Wu,Xuan Li,Yi Zhao,Denghao Huang,Shuqin Cao,Malcolm Xing,Leixiao Yu,Quan Yuan
Hemorrhage caused by trauma is a global public health issue. While traditional cotton gauze compression is commonly used for hemostasis, its efficacy is limited in severe hemorrhage cases. Herein, we developed a gauze with Janus wettability (JW-G). Its surface was sequentially dip-coated with hydrophilic polydopamine and then spray-coated with hydrophobic silicon dioxide nanoparticles. Benefiting from the asymmetric surface wettability, the obtained JW-G could control blood flow direction and permeation speed. JW-G's hydrophobic surface concentrates blood cells and facilitate faster clot formation in vitro. Meanwhile, the silicon dioxide nanoparticles could also activate coagulation factor XII. Therefore, the JW-G greatly accelerates the hemostasis. In vivo bleeding model further demonstrated JW-G's good performance in reducing bleeding time and blood loss compared with commercial hemostatic gauze. The present strategy to develop hemostatic gauze offers a promising solution for reversing the adverse outcomes of severe traumatic hemorrhage.
研究领域:
生物材料学
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创伤医学
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纳米医学
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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）