MOLECULES
·
2024
·Vol. 29
·期 8
·1834
·
IF 4.2
Mengruo Wu,Le Mu,Zhiyue Zhang,Xiangna Han,Hong Guo,Liuyang Han
Tetraethoxysilane (TEOS) is the most commonly used silicon-based reinforcement agent for conserving art relics due to its cost-effectiveness and commercial maturity. However, the resulting silica gel phase is prone to developing cracks as the gel shrinks during the sol–gel process, potentially causing severe damage to the objects being treated. In this study, dodecyltrimethoxysilane (DTMS) was introduced into TEOS to minimize this shrinkage by adding elastic long chains to weaken the capillary forces. The gel formed from the DTMS/TEOS hybrid material was transparent and crack-free, featuring a dense microstructure without mesopores or micropores. It exhibited excellent thermal stability, with a glass transition temperature of up to 109.64 °C. Evaluation experiments were conducted on artificially aged, handmade bamboo paper. The TEOS-based hybrid material effectively combined with the paper fibers through the sol–gel process, polymerizing into a network structure that enveloped the paper surface or penetrated between the fibers. The surface of the treated paper displayed excellent hydrophobic properties, with no significant changes in appearance, color, or air permeability. The mechanical properties of the treated bamboo paper improved significantly, with longitudinal and transverse tensile strengths increasing by up to 36.63% and 44.25%, respectively. These research findings demonstrate the promising potential for the application of DTMS/TEOS hybrid materials in reinforcing paper relics.
研究领域:
文物保护
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Heritage Science
·
2013
·Vol. 1
·期 1
·1-10
·
IF 0
Zhao Jing,Luo Hongjie,Wang Liqin,Li Weidong,Zhou Tie,Rong Bo
The use of organic–inorganic hybrid compounds containing tetraethoxysilane (TEOS) and hydroxyl-terminated polydimethylsiloxane (PDMS-OH) is one of the most promising approaches for using alkoxysilane-based formulations to improve the effectiveness of the consolidation of traditional silicate artifacts, such as ancient stone. Based on analysis of existing damaged potteries influenced by the crystallization of NaCl salt, the hybrid we prepared in this study provided a crack-free and homogeneous gel on the premise of appropriate PDMS-OH content. The consolidants were applied to samples prepared following procedures that simulate old pottery and the effect of the protective products was evaluated by characterizing the surface morphology, the determination of the consolidant uptake, color changes, water vapour permeability and several wet-dry cycles with salt. The best formulation found for the hybrid in the present work was made up of 10% PDMS-OH with TEOS, which showed a significant increase in compressive strength, with a value of 3.50 MPa at 3 mm depth of consolidation, similar to the sample treated with Primal SF(the commercial protective agents used for comparison purposes), which had 3.20 MPa in compressive strength at 2 mm depth of consolidation. Except for small color changes and excellent water vapor permeability, there was still no significant change, and the destructive effects from NaCl crystallization for the hydrophobic surface of the sample treated with hybrid material was different to what happened for the hydrophilic case in the original. Thus, this study has revealed, for the first time, the addition of an appropriate amount of PDMS-OH to TEOS helps to improve the mechanical properties, hydrophobic behavior and salt resistance of damaged pottery effloresced by the NaCl crystals; in addition small color changes and excellent water vapor permeability should also be taken into consideration.
研究领域:
材料科学
·
文物保护
✓ 已验证
产品关联
DOI
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 1
·195-204
·
IF 2.7
Wu Hongdan,Liu Xiaodi,Yang Xiaoyu,Hu Chuanzhi,Zhou Zhihui
Organosilica membranes derived from bis(triethoxysilyl)ethane (BTESE) and tetraethyl orthosilicate (TEOS) were prepared by sol-gel method on porous α -Al 2 O 3 supports and applied in pervaporation dehydration of isopropanol (IPA) aqueous solutions. The permeation characteristics of membranes in IPA/water mixture were evaluated for preparation conditions and stability, including long-term stability, acid resistance, and feed concentration. It was observed that the water contact angle of BTESE/TEOS-derived organosilica membrane decreased from (77.74±0.47)° to (36.67±1.05)° as the content of TEOS increased, which proved that the surface property of the membrane could be changed by the part of hydrocarbon units after hydrolysis condensation reaction. As the molar ratio of BTESE to TEOS was 1 : 2, the organosilica membrane showed high pervaporation performance for 90 wt% isopropanol aqueous solutions at 75 °C, with a water permeation flux of 10.580 kg·m −2 ·h −1 and separation factor of 1170. Stability experiments of long-term operation and acid environment in isopropanol aqueous solutions showed slight changes in flux and separation factor, proving that organosilica membranes had better stability. An increase in IPA concentration from 60 wt% to 90 wt% decreased both water flux and water content on the permeate side, suggesting that the effective pore sizes for permeation could be reduced by adsorption of IPA molecules, whereas the membrane remained high permeance in isopropanol aqueous solutions with high water content. The separation mechanism of pervaporation dehydration of isopropanol aqueous solutions by BTESE/TEOS-derived membrane was mainly attributed to the molecular sieve separation effect. The results showed that the BTESE/TEOS-derived organosilica membranes had an application prospect in the dehydration of aqueous-organic mixtures.
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Moke Zhou,Bin Tang,Shuren Zhang
The influence of the TEOS (Si(OC 2 H 5 ) 4 ) addition, which decomposes into SiO 2 at high temperature, on the sintering process, morphology, and microwave dielectric properties in Y 3 Al 5 O 12 (YAG) ceramics were investigated in this work. The Y 3 Al 5 O 12 + x wt.% TEOS (0≤ x ≤ 1) ceramics were synthesized through solid-state reaction. The XRD results indicated that all YAG samples possessed a pure cubic garnet structure. The dense, pore-free crystalline microstructure of the specimen was measured by SEM. The Rietveld method was employed to refine the lattice parameters of YAG samples. Results showed that the samples' cellular parameters decreased with increasing amounts of TEOS. The addition of TEOS lowered the sintering temperature and improved the Q × f values of Y 3 Al 5 O 12 ceramics. The YAG system was added by 0.5 wt% TEOS can be exhibited excellent microwave dielectric properties with ε r =10.82, Q × f = 229,423 GHz, τ f = -29.1 ppm/°C sintering at 1670 °C for 12 h.
研究领域:
材料科学
·
陶瓷工程
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 7
·1145
·
IF 3.4
Shuanqiang Yang,Zhenzhen Jia,Jinjia Xu,Ruoyu Hong
High-performance coating could be used to protect steels in engineering. The GPTMS-TEOS hybrid coatings were successfully prepared using (3-glycidoxypropyl) trimethoxysilane (GPTMS) and tetraethylorthosilicate (TEOS) as reaction raw materials and diethylenetriamine (DETA) as both a curing agent and catalyst at room temperature. The hybrid coating contained amorphous SiO2and was characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The DETA content of the hybrid coating has a significant impact on the performance of the coating. As the DETA content increases, the thermal stability of the hybrid coating increases at 400–600 °C due to the production of more SiO2in the amine-rich state. However, the gelation time decreases dramatically, preventing the hybrid coating from better infiltrating the surface of the steel substrate. In addition, there are not enough silicon hydroxyl groups to bond with the hydroxyl groups on the surface of carbon steel and adhesion is significantly reduced. Therefore, hybrid coatings with a moderate DETA content (NH:epoxy ratio equivalent to 1:1) show the best corrosion resistance, with a third-order magnitude increase in corrosion resistance compared to that of carbon steel.Keywords:GPTMS-TEOS;hybrid coatings;amorphous SiO2;anti-corrosion coatings
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 68
·期 1
·19-30
·
IF 1.66
Liu Rong,Han Xiangna,Huang Xiao,Li Weidong,Luo Hongjie
Tetraethoxysilane (TEOS) is the most commonly used silicon-based stone consolidant in art conservation. However, it is known that the resulting silica gel phase tends to develop cracks inside the stone as the gel shrinks during aging and drying. Such phenomenon may lead to severe damage to the protected objects. By introducing silica nanoparticles into TEOS, a so-called particle modified consolidant (PMC), may minimize such shrinkage by reducing the volume loss and forming mesoporous structure to weaken the capillary forces. But many previous results show significant color changes on the surface of PMC-treated stones which can not be tolerated in the conservation treatments of cultural heritage. In this work, we designed a three-component composite consolidant which consists of 15 nm silica particles, α,ω-hydroxyl-terminated polydimethylsilane (PDMS-OH) and TEOS. Among the three components, TEOS provides the consolidation function, silica nanoparticles prevent the cracking and increase the salt resistance and PDMS-OH further reduces cracking, decreases the color alteration and increases the resistance to wetting of the stone. Experimental results show that the three components have significant synergistic effect, which makes the material exhibiting best overall performance in terms of cultural heritage protection.
研究领域:
材料科学
·
文物保护
·
无机非金属材料
·
表面与界面化学
·
功能材料
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Weiping Zheng,Lifeng Hao,Yang Zhou,Bin Gu,Zewen Jiang,Yujie Fang
To fulfill practical demands for metal protection, a more in-depth exploration of the corrosion resistance of cerium dioxide nanoparticles (CeO 2 NPs) is essential. In this work, biomimetic porous CeO 2 NPs, featuring a high concentration of oxygen vacancies , were synthesized using a sol-gel method. Biomimetic porous CeO 2 NPs, characterized by the presence of oxygen vacancies , served as nanocontainers for benzotriazole (BTA) loading. Following this, TEOS-BTA@CeO 2 NPs were prepared by introducing tetraethyl orthosilicate (TEOS), a TEOS film encapsulating BTA@CeO 2 . Through electrochemical and salt spray testing, the 3 % TEOS-BTA@CeO 2 coating demonstrated superior corrosion resistance for the substrate when compared to both the 3 % CeO 2 coating and the 3 % BTA@CeO 2 coating. Throughout the entire corrosion process, the intelligent release of BTA facilitated by the TEOS film, coupled with the reduction in corrosion current due to oxygen vacancies serving as electron-capturing centers in cerium oxide, further enhances the corrosion resistance of CeO 2 NPs. This work marks a significant advancement in the exploration of nanocomposites for the practical utilization of CeO 2 NPs in combating metal corrosion.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Dong Beiping,Li Mingxuan,Li Zhaorui,Shang Zhihang,Zhou Xiang,Nie Lifang,Liu Juncheng
The anti-reflective film is one of the important and economical ways to improve the photoelectric conversion efficiency of solar cells. To enhance the weatherability of sol-gel derived SiO 2 antireflection films, a hybrid silicon source system consisting of isobutyl triethoxysilane (IBTS) and tetraethyl orthosilicate (TEOS) was employed for fabricating porous anti-reflection coatings via dip-coating, using polyethylene glycol monomethyl ether (mPEG) as the pore-forming agent. This study systematically investigated the influence of IBTS concentration on the film’s structural and optical properties. The results revealed a non-monotonic dependence of both film porosity and optical transmittance on IBTS content, with optimal performance achieved at intermediate concentrations. When the amount of IBTS was 6 ml, the film’s average transmittance within 380–1100 nm wavelength range reached the maximum 93.61%, 4.4 percentage points higher than that of the glass substrate. Moreover, the film’s adhesion strength reached grade 0, and its hardness was greater than 9 H. When the coated glass was used as the cover instead of the substrate glass, the efficiency of monocrystalline silicon solar cells improved from 11.64% to 12.26%, a relative increase of 4.93%. The film’s hardness and adhesion strength changed little after 100 h of UV lamp irradiation, while the average transmittance in the range of 380–1100 nm decreased with 0.45 percentage points. After immersion in hydrochloric acid solution for 80 h, the film hardness decreased to 8H, and the adhesion strength decreased to grade 1, while the transmittance increased with the increase of immersion time. When the immersion time reached 100 h, the film’s transmittance increased 0.81%. Graphical
研究领域:
材料科学
·
光学
·
太阳能
·
薄膜技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2022
·Vol. 77
·期 12
·1217-1222
·
IF 1.712
Song Xie,Yushan Liu,Hongliang Chen,Xiaozhan Yang,Wenlin Feng
A cadmium ion (Cd 2+ ) sensor based on polyvinyl alcohol (PVA)/tetraethyl orthosilicate (TEOS)/3-aminopropyl triethoxysilane (APTES) film integrated Mach–Zehnder interferometer was fabricated and evaluated. The three core fiber (TCF) is spliced with two single mode fibers (SMFs), one end of TCF and SMF are spliced with enlarged taper, and the other end of TCF is directly spliced with another SMF. PVA/TEOS/APTES composite film is coated on the surface of TCF. When the Cd 2+ is adsorbed by the sensing film, the relative refractive index of TCF cladding changes, the output interference trough wavelength shifts. By monitoring the wavelength shift information of the interference trough, the concentration of Cd 2+ will be obtained. In the concentration range of 0–0.4 μM, with the increase of Cd 2+ concentration, the interference trough shows a red shift. The sensitivity and the detection limit of the sensor are 7 nm/μM and 0.0143 μM (1.6 ppb), respectively. The sensor has excellent selectivity and good pH stability. It has the advantages of easy preparation, simple structure, and has potential application for the detection of trace Cd 2+ .
研究领域:
光学传感
·
环境监测
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Xia Gao,Tianbo Zhao,Guan Luo,Baohui Zheng,Hui Huang,Xue Han,Yuqiao Chai
A facile method was developed for encapsulating paraffin wax with St-DVB-SiO 2 organic−inorganic hybrid shells through the combination of suspension emulsion polymerization and hydrolysis and condensation reaction. In this work, the influence of TEOS/MPS mass ratios on the morphology, particle size distribution (PSD), content of core materials, latent heat storage capacity, thermal conductivity and stability of these microcapsules has been studied. SEM and PSD analysis showed that the fabricated microcapsules had a bowl-like shape with concaves on the shell. Moreover, SEM and TGA results jointly illustrated that the higher amount of MPS incorporated into the experimental process, the more SiO 2 particles bonded on the shell of microcapsules. DSC measurements revealed that the microcapsules had a melting temperature range of 44.36–55.03 °C and latent heat storage capacities of 38.90–95.67 J/g. It was suggested that microencapsulated paraffin wax with St-DVB-SiO 2 hybrid shells has been synthesized successfully.
研究领域:
材料科学
·
化学工程
·
热能存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2012
·
IF 2.159
Yan-Jing Gu,Bing Yan,Xiao-Fei Qiao
Novel rare earth complex-functionalized mesoporous SBA-16-type hybrid materials are synthesized by the co-condensation of modified 2-methyl-9-hydroxyphenalenone (MHPOSi), from modified 3-(triethoxysilyl)-propyl isocyanate (TEPIC), and tetraethoxysilane (TEOS) in the presence of Pluronic F127 as a template. These inorganic–organic mesoporous hybrids are characterized by FT-IR spectra, small-angle X-ray diffraction (SAXRD), N 2 adsorption–desorption measurements, thermal analysis and spectroscopy. Their photophysical properties, which show novel light conversion properties, are discussed in detail. The Eu 3+ hybrid system shows ultraviolet excitation and visible emission, and the Nd + and Yb 3+ hybrids exhibit visible excitation and NIR emission.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Yufeng Zhou,Yanxia Yu,Yaqian Zhang,Xiaodong Liu,Haisheng Yang,Xiaojuan Liang,Wei Xia,Weidong Xiang
All-inorganic halide perovskite (CsPb2Br5) nanocrystals (NCs) have received widespread attention owing to their unique photoelectric properties. This work reports a novel strategy to control the phase transition from CsPbBr3 to CsPb2Br5 and investigates the effects of different treatment times and treatment temperatures on perovskite NCs formation. By controlling the volume of tetraethoxysilane (TEOS) added, the formation of different phases of perovskite powder can be well controlled. In addition, a white light-emitting diode (WLED) device is designed by coupling the CsPbBr3/CsPbBr3–CsPb2Br5 NCs@TEOS nanocomposite and CaAlSiN3:Eu2+ commercial phosphor with a 460 nm InGaN blue chip, exhibiting a high luminous efficiency of 57.65 lm/W, color rendering index (CRI) of 91, and a low CCT of 5334 K. The CIE chromaticity coordinates are (0.3363, 0.3419). This work provides a new strategy for the synthesis of CsPbBr3/CsPbBr3–CsPb2Br5 NCs@TEOS nanocomposite, which can be applied to the field of WLEDs and display devices.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
发光二极管（LED）
·
光子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）