Desalination and Water Treatment
·
2024
·
IF 1
Song Deng,Jingrong Huang,Meng Guo,Xueni Sun,Xiuxiu Ren,Jing Zhong,Rong Xu
Novel p-phenylenediamine-bridged organosilica (PPDA-BOS-T) materials were synthesized via the co-condensation reaction assisted by tetraethyl orthosilicate (TEOS). These amino-functionalized organosilicas were characterized by Fourier transform infrared spectrometer, N 2 sorption, scanning electron microscopy, and transmission electron microscopy. The addition of TEOS played a positive role in the construction of the porous network structure of the bridged organosilicas. The saturation adsorption capacity for Ag(I) of the PPDA-BOS-T could reach 82.88 mg g –1 . The conformity to the Freundlich model indicated multilayer adsorption with active sites. Furthermore, the adsorption was followed well by the pseudo-second-order model, and the intraparticle diffusion was proved to be the rate-limiting step during the adsorption of Ag(I). Finally, the thermodynamic parameters including the change of free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) of adsorption were calculated.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Quanyi Yin,Shuhua Tu,Min Chen,Limin Wu
The fabrication of hollow organosilica nanoparticles with high elasticity is greatly desirable but still challenging. Herein, we present a new and simple strategy to prepare such nanoparticles by using hyperbranched polyvinylpolytrimethoxysilane (PVPMS) via a soap-free oil in water (O/W) emulsion system. PVPMS was synthesized through the radical polymerization of vinyltrimethoxysilane (VMS) followed by the acid-catalyzed hydrolytic polycondensation of trimethoxysilyl groups, which works not only as an organosilica precursor but also as a sole emulsion stabilizer due to its hydrolysis-induced amphiphilicity at the oil/water interface. When styrene was used as the oil phase and initiated to polymerize, hybrid polystyrene (PS) core–organosilica shell (PS@organosilica) nanoparticles were obtained by controlling the reaction conditions. Furthermore, highly elastic hollow organosilica nanospheres with low Young’s modulus (∼220 MPa) were yielded through solvent etching of the core. This study expands the scope of organosilica precursor from small molecule organosilane to polymeric macromolecule and provides useful guidance for application in other polyorganosilsesquioxane related hybrid organosilica particles and functional hollow nanoparticles.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 5
·1024-1031
·
IF 1.353
Lei Wenwen,Sun Yufa,Huang Bin,Zhou Xiangdong
The polyurethane modified organic silicone (PU-SA) was successfully synthesized via step-by-step polymerization with isophorone diisocyanate (IPDI) and polypropylene glycol (PPG) used as monomers, dibutyltindilaurate (DBTDL) as the catalyst, trimethylolpropane (TMP) and N-methyldiethanolamine (MDEA) as the chain extender, and amino-terminated siloxane (SA) as the blocking agent. The chemical structure of PU-SA was characterized by Fourier transform infrared spectroscopy (FT-IR). X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) showed that PUSA had been successfully finished on the surface. Additionally, the thermogravimetric analysis (TGA) demonstrated that the PU-SA treated fabrics showed low decomposition temperature and slightly high char residue. As a finishing agent, the effect of PU-SA on the handle of cotton fabrics was also studied by using a Kawabata Evaluation System for Fabrics (KES-F). The experimental results found that PU-SA had a significant improvement on the bending properties, surface properties, and compressional properties. Moreover, the mechanical and anti-wrinkle properties of the cotton fabrics were also enhanced.
研究领域:
材料科学
·
纺织工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Jiating Wen,Zhe Sun,Fanglong Zhu,Haojun Fan
A fluorine-free anti-smudge waterborne polyurethane coating was constructed via the dispersion of hexamethylene diisocyanate trimer into organosilicon-grafted waterborne polyurethane. In the film-forming process, the interaction among carboxyl, hydroxyl and isocyanate groups blocked the hydrophilic groups and improved the density of the coating, thereby preventing contaminants from penetrating into it. Furthermore, the organosilicon side chain migrated onto the coating surface to form a low surface energy amphiphobic layer, which endowed the coating with superior anti-graffiti performance. The surface energy of the as-constructed coating was 24 mN m −1 . The water, diiodomethane and hexadecane contact angles were 95°, 70° and 36°, respectively, with corresponding sliding angles of 35°, 10° and 1°, thereby showing that the coating had no affinity to oil- and water-based ink graffiti. More strikingly, the anti-graffiti performance remained after 400 abrasion cycles under a pressure of 110 kPa and under harsh chemical treatment (strong acids, bases and salts). The constructed coating also showed an optical transparency as high as 93 % due to the high crosslinking degree.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
J. Li,L.X. Chen,X. Li,C.C. Zhang,F.L. Zeng
In this study, a facile and effective surface hydrophobic layer protected selective etching strategy has been adopted to fabricate organic functionalized hollow silica nanospheres (OHSNSs). Our experiments demonstrated that the morphology and structure of OHSNSs were greatly affected by the types of organosilanes and concentrations of cetyltrimethylammonium bromide (CTAB) as pore-making agent. At low concentration of CTAB (1.9 mg/mL −1 ), it was found that the protective effect of the hydrophobic layer of 3-thiocyanatopropyltriethoxysilane (TCPTES) was so strong that can be endured long time etching (8 h), leading to the formation of hollow core and organic porous shell structure. And yet, the protective effect of the hydrophobic layer of vinyltriethoxysilane (VTES) was too weak to withstand alkali etching, resulting in preferentially etched of the outer vinyl protection shell. Whereas, at a higher concentration of CTAB (2.5 mg/mL −1 ), for TCPTES, the irregular and capsules-like spheres were obtained. In contrast, for VTES, porous core/solid shell structures with shell thickness of 16 nm were generated. In addition, no particles were observed when the CTAB concentration was above 2.5 mg/mL −1 .
研究领域:
纳米技术
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Linglin Cheng,Meng Guo,Jing Zhong,Xiuxiu Ren,Rong Xu,Gang Li,Yanzhu Ji,Minghui Qiu,Masakoto Kanezashi
In the petroleum industry, the mixing of ethanol (EtOH), isopropanol (IPA), and n-butanol (n-BuOH) with water is a prevalent occurrence in both production and recovery phases. Obtaining the required degree of purity via dehydration poses a significant challenge that needs to be addressed. Pervaporation has emerged as a promising method for separating azeotropic mixtures due to its energy efficiency and independence from vapor-liquid equilibrium constraints. In this study, organosilica precursors, namely 1,2-bis(triethoxysilyl)ethane (BTESE), 1,2-bis(triethoxysilyl)ethylene (BTESEthy), and 1,2-bis(triethoxysilyl)acetylene (BTESA), were utilized for the fabrication of organosilica membranes using the sol–gel method. Subsequently, these membranes were employed for pervaporation dehydration of EtOH, IPA, and n-BuOH. This study investigates the effect of the degree of unsaturation of the bridged group, feed composition, and C atom count of alcohol on membrane dehydration performance. The membranes demonstrated superior separation performance for the n-butanol/water mixtures compared to other alcohol/water systems investigated. In this particular context, BTESE membrane exhibited a significant separation factor, although accompanied by a reduced permeation flux. Conversely, BTESA membrane demonstrated a decreased separation factor but an increased permeation flux. The comparison between gas permeation and pervaporation highlighted that the separation mechanism was primarily governed by molecular sieving through the organosilica membranes.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 31
·e55723
·
IF 2.7
Xiaoxuan Li,Zheng Yin,Yanru Zhao,Penghui Li,Shengli Wu
Isocyanate-based monomers and polymers have found widespread industrial application; however, the realization of green water-based products via the preparation of stable isocyanate aqueous emulsions remains challenging. Herein, a series of organosilicon and organofluorine synergistically modified amphiphilic branched polyurethanes (HBWPU), synthesized by grafting perfluorohexyl ethanol semi-terminated isophorone diisocyanate (IPDI) onto a hydrophilic polyurethane prepolymer, is presented. Subsequently, using a physical mixing method, stable diisocyanate emulsions are fabricated by preparing diisocyanate latex particles with IPDI as the core and hyperbranched water-based polyurethanes (HBWPU) as the shell. Structural investigations showed that the branching degree and fluorine content of the HBWPU significantly affects the stability of the diisocyanate emulsions. Increasing the degree of branching from 0.34 to 0.86 causes the amount of residual isocyanate ( NCO) groups to decrease from 20.1% to 16.7%. In contrast, an increase in the fluorine content from 0% to 17.8% increases the amount of residual NCO groups from 11.5% to 24.6%. Thus, HBWPU can be used as an emulsifier to prepare waterborne diisocyanate cross-linking agents. Such polyurethane-coated isocyanate aqueous emulsions can increase the hardness and significantly improve the acetone resistance of hydroxyl polyacrylate resins.
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 Materials Chemistry A
·
2018
·Vol. 6
·期 26
·12323-12333
·
IF 9.931
Yangyi Sun,Min Chen,Limin Wu
Hollow periodic mesoporous organosilica spheres (HPMOSs) have some important special applications owing to their unique properties, but current syntheses usually involve various template methods that are time-consuming. Herein, we report a highly efficient and controllable synthesis of HPMOSs with radial mesochannels, only through introducing a pre-hydrolysis process to the commercially available bissilylated organosilanes (R′O)3Si–R–Si(OR′)3 with CTAB. The HPMOSs are robust with a mean diameter as small as 45 nm and a shell thickness as thin as 14 nm. A cytotoxicity assay indicates that the obtained HPMOSs possess good biocompatibility, and the HPMOSs with thioether groups are degradable under a 10 mM glutathione microenvironment. The amphiphilic organosilica precursors derived from the pre-hydrolysis process, CTAB micelles, and ethanol contribute to the formation of the HPMOSs.
研究领域:
材料科学
·
纳米技术
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 17
·5931-5937
·
IF 6.119
Danlei Wei,Lianqi Huang,Hanying Liang,Junhua Zou,Wenwen Chen,Can Yang,Yidong Hou,Dandan Zheng,Jinshui Zhang
Photocatalytic benzene hydroxylation reaction using a clean oxidant such as H2O2 is a green synthetic approach for phenol synthesis. Here, our study shows that silylated iron vanadate (FeVO4) nanorods can function as promising photocatalysts to direct hydroxylation of benzene to phenol, by taking advantage of the unique benefits of covalently bonded organosilane (OS) groups to realize kinetic control of heterogeneous photocatalytic reactions. The grafting of OS functional groups on FeVO4 helps to tailor its surface affinity to fine-tune the benzene adsorption behavior and photo-Fenton process for H2O2 activation. In addition, the OS groups immobilized on the FeVO4 surface via a rather strong Si–O bond also serve as an effective protective coating to suppress metal leaching, thus affording FeVO4 with an excellent stability to undergo a heterogeneous photo-Fenton process. As a result, the silylated FeVO4 exhibits robust photocatalytic benzene hydroxylation performance. The phenol yield and selectivity obtained on the optimized silylated FeVO4 are determined to be 20% and 98%, much better than that obtained from pristine FeVO4. Benefiting from its robust stability and tunable surface affinity, the silylated FeVO4 will have broad applications in photocatalytic selective oxidation to produce fine chemicals.
研究领域:
材料科学
·
环境化学
·
催化化学
✓ 已验证
DOI
高影响因子
PLANT PHYSIOLOGY AND BIOCHEMISTRY
·
2025
·
IF 5.7
Zhiheng Wang,Jia Wu,Shuxin Tu,Khurram Shehzad,Jingtao Hou,Shuanglian Xiong,Menghua Cao
Organosilicon exhibits unique physicochemical and biological properties with wide applicability across diverse fields, including agriculture and industry. Previous research has verified the effectiveness of organosilicon-modified fertilizers in inhibiting the uptake of cadmium (Cd) and arsenic (As) by plants. However, further investigations are necessary to elucidate the underlying mechanisms. In this study, we explored the potential of organosilicon to mitigate the toxic effects of Cd/As and lessen their uptake and accumulation during rice seed germination. Our results showed that under Cd/As stress, organosilicon treatments significantly increased suberin biosynthesis in rice roots. This was manifested as an increased level of root suberization and an enhanced apoplast barrier, as verified by observations made through fluorol yellow (FY) staining and transmission electron microscopy (TEM). Consequently, the uptake and translocation of Cd and As in rice seedlings were significantly reduced by 48.66% and 72.19% in shoots, and 43.23% and 68.93% in roots, respectively. Moreover, the application of organosilicon enhanced the activities of antioxidant enzymes in rice, This lead to an accelerated glutathione-oxidized glutathione (GSH-GSSG) cycle, up-regulated expression of the rice glutathione peroxidase gene ( OsGPX ), and increased GPX activity. These modifications effectively scavenged reactive oxygen species (ROS) generated by Cd/As stress and alleviated oxidative damage in rice. Overall, our study has unraveled the physiological and molecular mechanisms underlying the role of organosilicon in alleviating Cd/As toxicity in rice and has also provided new insights for the application of suberin in reducing heavy metal toxicity in plants.
研究领域:
植物生理学
·
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Xiaoxiao Wang,Lizhu Chen,Zhaogang Teng,Zhi-Fei Wang
Mesoporous thin films have been attracting considerable attention due to their potential application in membrane separation technology. However, how to prepare robust mesoporous silica films on a large scale using simple method still remains a great challenge. In this paper, for the first time, we report a facile and novel approach to fabricate layered mesoporous silica thin membrane using mesoporous organosilica nanosheets (mOSiO2 NSs) as the building block, which are prepared by combining template growth and selective etching. Transmission electron microscopy characterization displays that the resulting mOSiO2 NSs possess a large aspect ratio, a controllable thickness (16–27 nm), and a uniform tunable pore size (4–24 nm) by adjusting the reaction conditions. Owing to the large lateral dimension of the nanosheets, the as-prepared mOSiO2 NSs can be easily stacked into a highly packed and oriented membrane via the vacuum filtration. The results show that the nanofilter device based on such mOSiO2 NSs can successfully separate ovalbumin/cytochrome c (OVA/cyt c) or Ag/Au nanoparticles with different sizes, which provides a new strategy for nanosize separation.
研究领域:
材料科学
·
生物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·
IF 3
Bingqian Song,Weichao Du,Haiyan Dong,Shifeng Gao,Yuanzhi Qu,Ren Wang,Zhilei Zhang,Han Ren
In this study, organic silicon was introduced to humic acid for the first time, and set the novel polymer NaHm/AMPS/AM/TSP-L12 (HASSi) as an environmentally friendly filtrate reducing agent, which was developed by using silica modified material (TSP-L12), sodium humic acid (NaHm), 2-acrylamido-2-methylpropanesulfonic acid sodium (AMPS), and acrylamide (AM) as raw materials. The molecular structure, chemical composition of HASSi has been investigated and results show that HASSi shows the chemical structure was conformed to the molecular design. Differential scanning calorimetry–thermogravimetric analysis results illustrate that thermal decomposition temperature of HASSi under nitrogen was 250°C. Though temperature resistance evaluations, HASSi could withstand temperature up to 230°C. Salt and calcium resistance evaluations confirmed its resistance of NaCl could reach up to 5% and CaCl 2 to 0.5%. The filtrate reduce mechanism of HASSi was investigated through various methods, including scanning electron microscope analysis of HASSi aqueous solution, microstructure of filter cake, measurements of zeta potential, and particle size distribution, results showed that HASSi participation in the formation of mud cakes and illustrated an excellent filtration reduction effect. In addition, HASSi was identified as an environmentally friendly filter loss reducing agent through environmental performance evaluation, which shows a great application prospect in oilfield.
研究领域:
石油工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）