Polymers
·
2021
·Vol. 13
·期 8
·1295
·
IF 4.329
Hartina Mohd Yusop,Annur Isma Husna Mohd Ismail,Wan Norfazilah Wan Ismail
A new biopolymer–silica hybrid material consisting of inulin and tetraethoxysilane (TEOS) for use as an adsorbent was successfully synthesized via the sol–gel method in acidic conditions. The hydrolysis and condensation processes were attained in water/ethanol solution. Three molar ratios of inulin:TEOS (1:1, 1:2, and 2:1) were prepared and dried at various temperatures (50, 60, and 70 °C). The optimized molar ratio of 2:1 with a drying temperature of 70 °C was found to obtain the best morphology and characteristics for absorbent properties. Fourier transform infrared spectroscopy (FTIR) analysis showed a strong interaction between inulin and TEOS, which was also observed using energy dispersive X-ray spectroscopy (EDX). Field emission scanning electron microscopy (FESEM) images revealed the presence of nanoparticles on the rough surface of the hybrid sol–gel. X-ray diffractometer (XRD) analysis showed the amorphous state of the silica network where the inulin existed as an anhydrous crystalline phase. Brunauer–Emmet–Teller (BET) analysis confirmed that the composite was mesoporous, with 17.69 m2/g surface area and 34.06 Å pore size. According to thermogravimetric analysis (TGA) results, the hybrid inulin-TEOS adsorbent was thermally stable under a temperature of 200 °C.Keywords:adsorbent;biopolymer–silica hybrid;hybrid sol–gel;sol–gel process
研究领域:
材料科学
·
生物化学
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DOI
PubMed
高影响因子
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Zhi Wei He,Hong Xiao Lin,Chun Yan Li,Ashok M. Mahajan,Swati A. Gupta,Mei Zhou
Effect of various silicon sources, such as TEOS, MTES mixed with TEOS and 1,3,5-tris(triethoxymethyl) on SiO2 films was investigated. The synthesized solutions were used as silicon sources to prepare silica-like backbone films. The investigation showed that all precursors can able to produce the flat and uniform films. An FTIR spectrum confirmed the formation of SiO2 in film matrix. The results indicated that the internal microstructure of each film is different. The incorporation of less polar bonds such as F and C was carried out using various Si sources, while the introduction of these sources confirmed through FTIR spectra. Optical properties of the films were carried out by using ellipsometric porosometry (EP) measurement. The leakage current density for the films prepared by using TEOS, MTES and 135TTEB was observed to be 2.8 × 10-7 A/cm2, 2.9 × 10-8 A / cm2, and 4.1 × 10-6 A / cm2, respectively, at 1 MV/cm electric field strength by the IV curves obtained by semiconductor characterization after fabricating MIS devices. The calculated dielectric constants from RI of the deposited SiO2 films were 2.0, 1.9 and 2.5 respectively. When the microstructure of the precursor solution changed, the introduction of atomic morphology or terminal inerted group ratio changed the internal bridging mode of SiO2, and thereby significantly reduced the dielectric constant and improved insulation.
研究领域:
材料科学
·
电子工程
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DOI
INTEGRATED FERROELECTRICS
·
2014
·
IF 0.371
Xue Lei,Bing Yu,Hai-Lin Cong,Chao Tian,Yue-Zhong Wang,Qian-Bin Wang,Chuan-Kuo Liu
Monodisperse silica microspheres have drawn much attention for having important applications in many areas. In this paper, a series of monodisperse silica (SiO2) microspheres was synthesized successfully using a modified Stöber method in which tetraethyl orthosilicate (TEOS) was continuously supplied into the reaction system by a syringe pump. By changing the supply rate of TEOS, the diameters of the obtained SiO2 microspheres were controlled very well from 1 μm to 3 μm. Detailed characterization of the silica particles was performed using scanning electron microscopy (SEM).
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Feng Guo,Han Yin,Hongxin Luo,Nanqi Shi,Xin Li,Jiaxin Ma,Haiyan Li
Metal-organic framework (MOF) materials possess a significant specific surface area and exceptional porosity, which offer significant advantages in corrosion protection. We have created a Zeolitic Imidazolate Framework-8 (ZIF-8) nanocapsule that is responsive to changes in pH. This nanocapsule is designed for providing self-healing performance to epoxy coating and corrosion protection property on Q235 carbon steel. The classical ZIF-8 was synthesized as the nanocontainer, and the relatively high loading percentage of benzotriazole (BTA) into it was endowed the coating system with outstanding resistance to corrosion and the ability to self-healing. Furthermore, A coating of tetraethyl orthosilicate (TEOS) was deposited onto the surface of BTA@ZIF-8, which would rupture under alkaline and acidic conditions, achieving controllable release of BTA and timely repair of the damaged areas of coating, prolonging the lifespan of the coating system. The successful preparation of the BTA@ZIF-8/TEOS nanocapsules was confirmed through characterization using SEM, FTIR, and XRD techniques. BTA had a loading capacity of approximately 8.5 wt%. After a 30-day soaking period, the EIS analysis revealed that the impedance modulus of the 2 wt% BTA@ZIF-8/TEOS/EP scratch coating was determined to be 7.48 × 10 3 Ω ·cm 2 , which is much greater than the epoxy coating. The non-scratch coating, comprising 2 wt% BTA@ZIF-8/TEOS nanocapsules, demonstrated an impedance modulus above 10 7 Ω ·cm 2 following 50 days of soak. The coating provides exceptional resistance to corrosion and possesses the ability to heal itself.
研究领域:
材料科学
·
腐蚀防护
·
表面工程
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DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Yiran Bian,Yi Zhang,Taosuo Wang,Chuang Yang,Zhiming Feng,Kheng-Lim Goh,Yibin Zhou,Mingming Zheng
The enzymatic synthesis is essential for the flavor esters in the food and fragrance industries. This paper introduces a novel preparation method for lipase microarrays (CALB@PMHOS-TEOS) with loadings up to 229 ± 1.4 mg/g. Using surfactant-free hydrophobic silica-hybridized mesoporous materials and Candida antarctica lipase, this resulted in the effective synthesis of flavor esters. Using CALB@PMHOS-TEOS a Pickering emulsion system was formed at the oil-water interface for the sustainable synthesis of flavor esters. This resulted in a 93.5 ± 0.5 % conversion of hexanoic acid within 2 h at an optimal temperature of 35 °C, which is the highest level recorded in the literature to date. Furthermore, the conversion of hexanoic acid was maintained at 63.9 ± 1.2 % after 9 cycles of CALB@PMHOS-TEOS reuse. The application of the enzyme to the synthesis in a variety of flavor esters achieved a new benchmark in the existing literature. A molecular docking model was evaluated to understand the molecular mechanism underpinning the immobilized lipase. This work introduces a novel method for the eco-friendly and efficient synthesis of flavor esters for applications across various fields including food and cosmetics.
研究领域:
食品科学
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生物化学
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Panchan Dansawad,Yi Fang,Lixia Cao,Haigang Gao,Cong Xue,Ruifeng Ran,Haofei Nie,Yanxiang Li,Wangliang Li
A superhydrophilic composite membrane made from hydrolyzed TEOS-modified recycled PET (rPET), polyethylene glycol (PEG), and silicon dioxide (SiO 2 ) has been developed for effective oil-in-water separation. This membrane exhibited superhydrophilicity, excellent anti-fouling properties, and high separation efficiency for surfactant-free and surfactant-stabilized emulsions. After 72 h of continuous separation, the membrane achieved 92.28 % separation efficiency and 290.55 L·m 2 ·h 1 flux for surfactant-free emulsions, and 85.11 % efficiency and 115.33 L·m 2 ·h 1 flux for surfactant-stabilized emulsions. This study highlights the potential of the membrane for industrial oil–water separation applications, with opportunities for further improvements through enhanced system design and composition optimization.
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高影响因子
Polymers
·
2022
·Vol. 14
·期 15
·3103
·
IF 4.967
Jiangtao Shi,Haizhe Zhang,Yuhan Liu,Chongyang Xia,Yaoli Zhang
It is a novel idea to fabricate wood-inorganic composites by utilizing the transpiration of bionic trees to realize the self-assembly of inorganic precursors in wood formation. We selected a 10-year-old poplar and diffused the solvent or sol containing SiO2precursor into the xylem via the slow-release drip method. In combination with the moisture in xylem, reactions such as hydrolysis, polycondensation and self-assembly were induced in order to form wood inorganic composites. It was found, through microscopic observation, that such inorganic substances were yellowish brown and widely existed in vessels, wood fibers and ray cells. For the new grown wood, the fiber–tissue ratio and cell wall thickness underwent an increase, while the vessel diameter and tissue ratio experienced a decline. Moreover, such change was related to the concentration of precursors. EDS analysis proved that the elemental composition of sediments in wood cells was C, O, Si, K and Ca. XPS confirmed that the newly formed wood contained silicon oxide, illustrating that the standing tree slow-release drip technology could induce wood to fabricate inorganic composites.Keywords:living tree modification;TEOS;wood anatomy;cell wall formation;SiO2
研究领域:
植物学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2018
·Vol. 23
·期 1
·277-284
·
IF 2.509
Liu Jiuqing,Wang Cheng,Wu Xiufeng,Zhu Fangfang,Liu Meng,Xi Yang
The low crystallinity poly(vinylidene fluoride)/tetraethyl orthosilicate silane (PVDF/TEOS) composite separator with a finger-like pore structure for lithium-ion battery has been successfully prepared by non-solvent-induced phase separation (NIPS) technique. The PVDF/TEOS composite separator shows the excellent wettability and electrolyte retention properties compared with Celgard 2320 separator. AC impedance spectroscopy results indicate that the novel PVDF/TEOS composite separator has ion conductivity of 1.22 mS cm −1 at 25 °C, higher than that of Celgard 2320 separator (0.88 mS cm −1 ). The lithium-ion transference number of PVDF composite separator added 0.7% TEOS was 0.481, better than that of Celgard 2400 (0.332). What is more, the lithium-ion batteries assembled with PVDF/TEOS composite separator show good cycling performance and rate capability.
研究领域:
材料科学
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电化学
·
能源技术
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Yinghui Yuan,Guangli Dong,Yinglin Liu,Lili Tian,Bingyu He,Enliang Zhou,Hong Hao
This study focuses on the surface modification of substrates using a poly(N,N-dimethyl-N-(ethoxycarbonylmethyl)-N-[2′-(methacryloyloxy) ethyl]-ammonium chloride-co-3-(trimethoxysilyl)propylmethacrylate) P(CBMAE-co-TMSPMA) and ethyl orthosilicate (TEOS). By covalently bonding the Si-OH pendant of the copolymer with hydroxyl residues on the material's surface, a stable polymer coating is formed. The properties of P(CBMAE-co-TMSPMA) coatings were evaluated using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscope (SEM), and contact angle (CA) meter. The addition of TEOS allows for the regulation of surface roughness. With the increase of TEOS content, the contact angle of underwater oil first increased and then decreased. The water contact angles were 8°, the underwater superoleophobic contact angle reached 168°, and the number of adherent platelets and Escherichia coli were significantly reduced to 7.5% and 5% on the surface of the coating, respectively. After undergoing simultaneous hydrolysis, the superoleophobic contact angle of P(CBMAE-co-TMSPMA)/SiO 2 coating further increased to 174°. These interesting and robust properties make them promising candidates for biomedical applications. Highlights The underwater superoleophobic coating (contact angles of 174°). The P(CBMAE-co-TMSPMA)/SiO 2 coating with excellent resistance to oil adhesion. Solve the hydroxyl residue problem. The coating resistance to E. coli and platelet adhesion.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 46
·19771-19777
·
IF 0
Jing Hu,Xuge Wang,Liqin Liu,Limin Wu
This paper presents a facile and general method for fabrication of organic silica hollow spheres by co-hydrolysis and condensation reactions of TEOS and other silane coupling agents under the catalysis of ammonia. Silane coupling agents were first pre-hydrolyzed to form micelles. When TEOS was added, a sol–gel reaction takes place between TEOS and the Si–OH and methoxy groups, at the surfaces of the micelles to form porous silica shells, producing organic silica hollow spheres. Taking vinyl silica hollow spheres as an example, the as-obtained hollow spheres exhibited considerably high adsorption properties for Pb2+ and other heavy metal ions.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
THERMOCHIMICA ACTA
·
2021
·
IF 3.115
Lei Liu,Xiang Cheng,Xiwang Miao,Ying Zhang,Min Guo,Fangqin Cheng,Mei Zhang
In this work, a series of SiO 2 @n-octadecane capsules were prepared by one step emulsion polymerization, the influence of emulsifying speed, ammonia and TEOS contents, reaction temperature, concentration of emulsifier and the amount of PVP on the size, structure and performance was detailed investigated. It can be seen from SEM characterization that among these factors emulsification speed had the greatest influence on capsule size, while followed by the ammonia and TEOS content. According to TEM results, the ammonia and TEOS contents were the most important factors on the structure (shell thickness and surface smoothness) of the capsules, attributing to ammonia and TEOS were the catalyst and reactant of hydrolysis polymerization, respectively. Generally, the crystallinity of the samples became worse as the size decreased. DSC results showed that excessive ammonia or TEOS caused a significant drop in the enthalpy of the samples, furthermore, the enthalpy basically decreased with the attenuation of the inner radius of the sample. The target SiO 2 @n-octadecane capsule was sample C2 with high enthalpy (127.7 J/g), size of 1.62 μm, shell thickness of 68 nm, and smooth surface. More importantly, within the parameters studied, a series of SiO 2 @n-octadecane capsules were successfully synthesized with different enthalpy values (min 85.9 J/g, max 144.3 J/g), sizes ranging from 0.63–2.75 μm, shell thickness 32–79 nm and different smooth surfaces. Therefore, the controllable synthesis of SiO 2 @n-octadecane capsules within the above range can be achieved by simulating different parameters and their development.
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
Coatings
·
2026
·Vol. 16
·期 2
·219
·
IF 3.4
Renjuan Sun,Yan Wang,Yanhua Guan,Chuanyi Ma,Chuan Wang,Yao Ran
Concrete is widely employed in structural engineering; however, its porous nature renders it vulnerable to chloride ingress and salt freezing cycles, ultimately compromising its durability. To address this, a penetrating primer based on tetraethyl orthosilicate (TEOS) was prepared in an ethanol-water co-solvent system, and a hydrophobic topcoat of isooctyltriethoxysilane (IOTES) was obtained via emulsification. A layered application on concrete surfaces yielded a TEOS–IOTES dual-coating protection system designed to enhance water repellency and thereby improve resistance to chloride penetration and salt freeze–thaw damage. Test results show that the dual coating markedly increased hydrophobicity, giving a water contact angle of 130° and reducing water absorption rate to below 0.01 mm/min0.5. Compared with single-layer treatments, the dual coating significantly lowered the free chloride diffusion coefficient (reached 83.74%). In terms of salt freezing cycle resistance, the dual-coating protection delayed surface scaling and increased the critical number of freeze–thaw cycles required for damage by 40%. Microstructural analyses indicate that the TEOS primer generates nano-SiO2and C-S-H gels, refining pores and densifying the matrix, while the IOTES topcoat forms a durable hydrophobic layer that suppresses moisture and deleterious ion transport. The synergistic “densification–hydrophobization” mechanism substantially enhances concrete durability, offering a cost-effective and efficient surface-protection strategy with promising application potential.
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DOI
高影响因子
危险品化学品经营许可证（带存储）