JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY
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2022
·
IF 2.865
Yulan Jian,Shaowei Lu,Wei Tang,Mingjun Shao,Fuhua San,Hui Wan,Linkun Xie
To explore the typical alkyltrichlorosilane and optimal volume ratio of the alkyltrichlorosilane-toluene solutions for preparing superhydrophobic Pinus kesiya wood, four alkyltrichlorosilanes: methyltrichlorosilane (MTCS), butyltrichlorosilane (BTCS), dodecyltrichlorosilane (DTCS), and octadecyltrichlorosilane (OTCS) were each used to modify the wood samples at different volume ratios of alkyltrichlorosilane-toluene solutions. The Pinus kesiya wood specimens were immersed in the solutions to fabricate superhydrophobic coatings on the wood surface. The wettability of the modified wood surfaces was characterized by water contact angle and water uptake values. The chemical composition of the wood samples was analyzed using X-ray photoelectron spectroscopy (XPS) and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), and the surface morphology of the modified wood samples was observed using scanning electron microscopy (SEM). The result showed that all types of alkyltrichlorosilane-modified wood changed from hydrophilic to hydrophobic. The wood specimens had the highest water contact angle of 151.8 ± 0.4° and lowest water uptake of 18 ± 0.6 wt.% when 0.25 vol.% MTCS and 0.25 vol.% OTCS solutions were applied, respectively.
研究领域:
材料科学
·
林学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Yuquan Cai,Jieyuan Zheng,Hong Fan
A facile and controllable way to prepared silane-crosslinked polyethylene by coordination polymerization was proposed in this article. Four alkene-derived chlorosilanes, trichloro(oct-7-en-1-yl)silane (Oct-TriSi), dichloro(methyl)(oct-7-en-1-yl)silane (Oct-DiSi), chlorodimethyl(oct-7-en-1-yl)silane (Oct-MoSi) and (2-(bicyclo[2.2.1]hept-5-en-2-yl)ethyl)dichloro(methyl)silane (Nor-DiSi) were first synthesized by hydrosilylation and copolymerized with ethylene to prepare cross-linkable polyethylene. The copolymerization results of ethylene/octenyl-silanes indicated monochloro-substituted silane showed lowest crosslinking ability while trichloro-substituted silane showed the lowest copolymerization ability, therefore, their ability to prepare cross-linkable polyethylene was: Oct-DiSi > Oct-TriSi > Oct-MoSi, moreover, Nor-DiSi outcompeted Oct-DiSi as comonomer to obtain higher copolymerization activity, comonomer proportion in copolymer, comonomer conversion and gel content. The crosslinking process was simply finished via alcoholysis with methanol and subsequent hydrolysis catalyzed with DBTDL. Even with a slight addition of Nor-DiSi, the polyethylene was able to be crosslinked, with the gel content ranging from 42.0 to 98.0%. The TGA and DMA tests demonstrated the crosslinked copolymers showed better thermal stability and heat deformation resistance than polyethylene. After crosslinking, the copolymers with an appropriate gel content would have higher yield stress, tensile modulus and tensile stress.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
Membranes
·
2021
·Vol. 11
·期 2
·142
·
IF 4.106
Junjie Yu,Kaifeng Gu,Binbin Yang,Kaizhen Wang,Yong Zhou,Congjie Gao
The work briefly introduces the nano-composite reverse osmosis (RO) membrane with more permeability and selective performance, and we adopted the phenyltrichlorosilane precursor with better chemical stability and greater spatial resistance. The phenyltrichlorosilane concentration was mainly discussed in this work. The in-situ hydrolysis of phenyltrichlorosilane and the occurrence of ammonia hydrolysis make it effectively incorporated into the polyamide film. The covalent bond and hydrogen bond of phenyltrichlorosilane and polyamide (PA) can be realized. The phenyl group can extend in the polyamide polymer network and give the film corresponding functions. There will be fewer non-selective defects between phenyltrichlorosilane and PA. Under the premise of maintaining the water-salt selectivity of the membrane, along with the increase of benzene trichlorosilane loading, the 300% pure water flux can be achieved and the desalination rate remains at 98.1–98.9%. This reverse osmosis (RO) is suitable for household water purification.Keywords:polyamide film;phenyltrichlorosilane;situ hydrolysis;ammonia hydrolysis
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
SURFACE REVIEW AND LETTERS
·
2022
·
IF 1.24
YULAN JIAN,HUI WAN,KAIMENG XU,YARU ZHANG,LINKUN XIE
To study the hydrophobic properties of Betula alnoides wood modified by alkyltrichlorosilanes, four alkyltrichlorosilanes with different chain lengths were used to prepare hydrolytic solutions by adding 0.25% (v/v) of alkyltrichlorosilane to anhydrous toluene, and the wood samples were immersed in the hydrolytic solutions for 4 h. The surface chemical compositions of the samples were analyzed by X-ray photoelectron spectroscopy (XPS) and Varian 640-IR Fourier Infrared Spectrometer (ATR-FTIR), the surface morphology of the samples was observed by scanning electron microscopy (SEM), and the wettability of the modified wood was investigated using an optical contact angle goniometer. The results demonstrated that treatment with alkyltrichlorosilanes introduced Si and low surface energies of –CH 2 and –CH 3 on the surface of Betula alnoides wood. The –CH 2 and –CH 3 content increased with the increase in chain length. Alkyltrichlorosilanes formed a different micro or nanoscale roughness on the surfaces of the wood samples. The water contact angles of all coatings of alkyltrichlorosilanes are greater than 1 3 1 . 3 ± 2 . 4 ∘ , and greater than 1 1 5 . 5 ± 0 . 9 ∘ after 180 s. The water absorption decreases with the increase in chain length. The water absorption of the uncoated sample is 4 4 . 0 ± 1 . 9 wt.%, while those of samples modified by MTCS and OTCS are 1 8 . 0 ± 0 . 9 wt.% and 1 1 . 0 ± 0 . 0 wt.%, respectively.
研究领域:
木材科学
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表面化学
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DOI
高影响因子
APPLIED CLAY SCIENCE
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2025
·
IF 5.8
Xin Wang,Sen Zhang,Chao Zhou,Jie Hu,Chunze Li,Fenglei Han
Hydrophobic sepiolite with good oil adsorption performance is prepared by the atmospheric pressure vapor deposition method with methyltrichlorosilane (MTS) as the modifier. Systemic investigations reveal that MTS modification on the sepiolite surface introduces hydrophobic groups and enhances the oils' wetting and spreading ability on the sepiolite fibers. At the same time, bead-string-shaped SiO 2 nanowires formed by hydrolysis polymerization of MTS are observed, increasing adsorption surface and pores. Besides, the HCl hydrolyzed from MTS reacts with interlayer Mg 2+ in sepiolite's layered magnesium silicate crystal structure. This reaction leads to delamination, increasing the pore volume and pore area of sepiolite. The generated MgCl 2 products are removed by washing without causing environmental pollution. The modified sepiolite exhibits good hydrophobicity (WCA max = 144°) and excellent oil-adsorbed capacity (saturated oil adsorption 2.29 g·g −1 ). In addition, the modified sepiolite still has excellent oil adsorption capacity (oil adsorption 2.17 g·g −1 ) after 15 adsorption-desorption cycles. Therefore, this work presents a facile and low-cost route for natural clay materials modification and its environmental application.
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
Materials
·
2023
·Vol. 16
·期 21
·6912
·
IF 3.4
Jixiang Cai,Youwen Li,Lianghuan Wei,Jiangpeng Xue,Ning Lin,Xianghao Zha,Guodong Fang
In this paper, nano-silica particles were prepared from chlorosilane residue liquid using an inverse micro-emulsions system formed from octylphenyl polyoxyethylene ether (TX-100)/n-hexanol/cyclohexane/ammonia. The influence of different reaction conditions on the morphology, particle size, and dispersion of nano-silica particles was investigated via single-factor analysis. When the concentration of chlorosilane residue liquid (0.08 mol/L), hydrophile-lipophilic-balance (HLB) values (10.50), and the concentration of ammonia (0.58 mol/L) were under suitable conditions, the nano-silica particles had a more uniform morphology, smaller particle size, and better dispersion, while the size of the nano-silica particles gradually increased with the increase in the molar ratio of water to surfactant (ω). The prepared nano-silica was characterized through XRD, FT-IR, N2adsorption/desorption experiments, and TG-DSC analysis. The results showed that the prepared nano-silica was amorphous mesoporous silica, and that the BET specific surface area was 850.5 m2/g. It also had good thermal stability. When the temperature exceeded 1140 °C, the nano-silica underwent a phase transition from an amorphous form to crystalline. This method not only promoted the sustainable development of the polysilicon industry, it also provided new ideas for the protection of the ecological environment, the preparation of environmental functional materials, and the recycling of resources and energy.Keywords:chlorosilane residual liquid;inverse micro-emulsions;nano-silica;sustainable development
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
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Kai Su,Jiachengjun Luo,Yongjun Ji,Xingyu Jiang,Jing Li,Jianling Zhang,Ziyi Zhong,Fabing Su
Here we report the first synthesis of nearly pure-phase Cu 3 Si alloy that can be a highly efficient catalyst in the hydrochlorination of silicon reaction. This material was prepared by a high-temperature (1050 °C) calcination method in which copper and silicon powders were used as the reactants. The X-ray photoelectron spectroscopy (XPS) study revealed that the Cu and Si atoms in the Cu 3 Si alloy carried part of positive and negative charge, respectively. When employed as the catalyst in the silicon hydrochlorination to SiHCl 3 (TCS) for the production of Si polycrystals for Solar cell, the sample Cu 3 Si exhibited excellent low-temperature catalytic performance: the Si conversion and TCS selectivity respectively achieved 41.1% and 96.1% at 250 °C. Notably, its TCS yield at 250 °C was 1.2 times higher than that of the industrial catalyst-free system at 350 °C. Detailed analysis of the reaction process showed that the positively charged Cu atoms and negatively charged Si atoms in Cu 3 Si alloy could cleave the H–Cl bond in the reactant HCl and make the combination of H and Cl atom with Si atoms easier. Meanwhile, the reaction between the remaining Cu atom and Si was accelerated, leading to the generation of more active Cu 6.69 Si and ultimately superior catalytic performance. This work deepens the fundamental understanding of the hydrochlorination of silicon reaction, and provides an avenue for the synthesis of Si-based alloy catalysts .
研究领域:
材料科学
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化学工程
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 14
·11317-11324
·
IF 2.22
Cai Jixiang,Huang Bing,Zhang Jianghong,Hu Xin,Li Youwen,Xue Jiangpeng
Nano-silica particles were prepared using chlorosilane residual liquid as raw materials in an inverse microemulsion system formed by three different surfactants (TX-100, CTAB, SDS) with n -hexanol, cyclohexane, and ammonia. The phase behavior of inverse microemulsions and the preparation of nano-silica were investigated. The results showed that the system composed of non-ionic surfactant TX-100 had a larger inverse microemulsion region than other two system and was more suitable for the preparation of nano-silica. The prepared nano-silica had uniform sphericity and good dispersibility, the average particle diameter of 31 nm, and the variance of 1 nm. XRD, FT-IR, N 2 adsorption/desorption experiments and TG-DSC analysis were used to characterize the prepared nano-silica. The results showed that the prepared nano-silica was amorphous mesoporous silica with a BET specific surface area of 472.5 m 2 /g. They have a good thermal stability, and the phase structure and main chemical functional groups of nano-silica would not change after calcination at 600 °C, but the nano-silica would undergo a phase change at 1135 °C, which changed from amorphous to crystalline. The new technology not only broadened the source of preparation of nano-silica materials, but also provided new ideas for the treatment of chlorosilane residual liquid and the sustainable development of polysilicon industry.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Minhong Xu,Guoxiang Pan,Yuhua Guo,Qiu Liang,Zijuan Yu,Yongyong Cao,Yongya Wang
Oil/organic solvent leakage will pose a serious threat to the environment and ecology, and efficient oil-water separation has attracted much attention in recent years. A new porous composite form hydrophobic hydrotalcite/polyurethane (PU-L) was successfully prepared using hydrophobic nano-hydrotalcite and polyurethane (PU) via a thermally induced phase-separation method. The PU-L was modified with methyltrichlorosilane (MTS) to obtain the modified composite form (PU-L-M), which can be employed for oil/water separation. The morphology, chemical composition and oil-water separation properties of PU-L-M were systematically examined using XRD , SEM, XPS , TG-DTA and contact-angle measurements. The PU-L-M exhibited an impressive adsorption capacity for organic solvents (silicone oil, cyclohexane , toluene, chloroform and corn oil), ranging from 8.66 to 36.71 g/g. Results confirmed the ability of PU-L-M to effectively separate organic materials from wastewater. Additionally, PU-L-M exhibited excellent reusability after 10 cycles of oil adsorption. The recovery rate of corn oil by PU-L-M was as high as 87.03 %. The adsorption of corn oil by PU-L-M conformed to the pseudo-second-order kinetic model. Notably, the chemical interaction among PU, MgAl-L-M, and MTS was occurred. A novel type of PU-L-M composite foam was successfully designed and prepared, and it exhibited excellent performance for oil-water separation and oil adsorption.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2020
·
IF 3.724
Ha N. Giang,Truyen X. Nguyen,Tien V. Huynh,Lam H. Tran,Hoa N. Nguyen,Khanh B. Vu,Van V. Vu
The fabrication techniques of hydrophobic and superhydrophobic surfaces have received attention from many researchers. In this study, the change of water contact angle of the glass surface modified with chlorosilane or trichlorosilane compound was investigated. The microscope glass with water contact angle of 88° and 107° were obtained by treating with trimethylchlorosilane (TMCS) and octadecyltrichlorosilane (OTS), respectively. The chemical resistance of hydrophobic layer was evaluated by immersing the treated samples into an acidic or a basic solution. The result showed that OTS bonded to the glass surface more strongly than TMCS. The superhydrophobic state with the highest contact angle of 154° (sliding angle 17°) could be achieved with the glass microfiber filter by using OTS. The similar phenomenon could not be observed with TMCS because the TMCS-treated glass filter remained completely wetted with all investigated concentrations. The hydrophobic layer on the glass slides was strongly affected by abrasive force while the contact angle value of more than 154° was detected in the treated glass filter after 50 cycles of abrasion test on a sandpaper. The scanning electron microscope (SEM) images had revealed the aggregation of the OTS molecules on the glass filter surface. The chemically-treated filter performed both superhydrophobic and superoleophilic properties. The OTS coating showed strong resistance to the organic solvent . Separation of mixture n -hexane and water was successfully demonstrated using the modified filter.
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
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 11
·1-13
·
IF 2.009
Wu Xiaoxu,Zhang Wei,Li Zhi,Zhang Yan,Huang Siqi,Liu Qiong
Methylchlorosilanes (MSCs) of the type (CH 3 ) n SiCl 4−n ( n = 1, 2, 3) are usually used for surface modification of silica aerogels (SAs), in which the quantity of Si–Cl and Si–CH 3 groups deeply affects the properties of prepared SAs. In this work, methyltrichlorosilane (MTCS, n = 1), dimethyldichlorosilane (DMDCS, n = 2), and trimethylchlorosilane (TMCS, n = 3) were used to modify wet gels and the effects of Si–Cl and Si–CH 3 groups’ quantity on microstructures and surface properties were explored in detail. It turned out that the MTCS modified SA (MSA) possessed the most compact and nonuniform three-dimensional nanostructure among the three SAs, accompanied by the biggest density of ~ 0.14 g/cm 3 . Further investigations demonstrated that all the three SAs had similar BET surface area of about 900 m 2 /g and average pore size of 10–15 nm. Though FTIR analysis presented the discrepancies obviously among the three SAs, the thermal stability of the three SAs was similar, with the onset and peak temperatures in the exothermic reaction of methyl groups being ~ 240 °C and ~ 270 °C, respectively. The best hydrophobicity belonged to the TSA, verified by the biggest contact angles of 155°. Thus, all these indicated that the properties of the three SAs were deeply related to the quantity of Si–Cl and Si–CH 3 groups in MCS.
Graphical abstract
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
Journal of Cleaner Production
·
2024
·
IF 9.7
Hongqiang Li,Chenglong Liu,Zhaokai Peng,Qian Chen,Richard M. Kasomo,Yanfeng Jin,Xiaoqing Weng,Nelima M. Ondiaka,Yingxin Chen,Shaoxian Song
Recovering fluorine from wet-process phosphoric acid (WPA) by the evaporation concentration method has been widely used due to its simplicity and cheapness. However, the low fluorine recovery reduces the WPA quality, which in turn has detrimental effects on fertilizer production and leads to a waste of valuable fluorine resources. In this work, a cost-effective organic liquid, methyltrichlorosilane (MTS), was first employed as the gasification reagent in the WPA concentration process to promote fluorine recovery. The effects of several important parameters including MTS dosage, initial mass of absorptive water, addition stages, stirring speed, and concentration temperature, were investigated. The first three factors emerged as pivotal determinants of the fluorine recovery and the results revealed a remarkable 87.94% recovery of fluorine from WPA, signifying a substantial enhancement compared to the recovery achieved in the absence of MTS, which amounted to 40.36%. The defluorination kinetics data was well-fitted with a second-order model, and showed an activation energy of 23.77 kJ/mol, highlighting the strong interaction between MTS and fluorine in WPA. In addition, liquid MTS could recover fluorine selectively and efficiently without compromising the quality of WPA and exhibited superior fluorine recovery when compared to traditional solid mineral reagents such as diatomite and white carbon black. Further analysis revealed the governing mechanism for fluorine recovery that the addition of MTS prevented the conversion of liquid HF and H 2 SiF 6 to solid Na 2 SiF 6 and K 2 SiF 6 , favoring SiF 4 gas production. Overall, this research provides valuable insights for enhancing fluorine recovery during the WPA concentration process and developing environmentally friendly reagents.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）