CONSTRUCTION AND BUILDING MATERIALS
·
2017
·
IF 3.169
Jinfeng Sun,Kai Xu,Chaoqi Shi,Jian Ma,Weifeng Li,Xiaodong Shen
TiO 2 @SiO 2 nanoparticles with a core/shell structure widely used in photocatalytic fields were used in this paper to improve the hydration properties of the Portland cement. To this end, the core/shell TiO 2 @SiO 2 nanoparticles were synthesized first and then characterized by a series of techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR) and X-ray photoelectron spectra (XPS). Second, the influence of the core/shell TiO 2 @SiO 2 nanoparticles on cement hydration was investigated and compared with nano-TiO 2 through isothermal calorimetry, XRD, thermo gravimetric/derivative thermo-gravimetric (TG/DTG) and mercury intrusion porosimetry (MIP) analyses. The results showed that an amorphous SiO 2 layer can be deposited uniformly on nano-TiO 2 particles by forming new Si O Ti chemical bonds at the interface between the SiO 2 coating layer and nano-TiO 2 particle surface. This uniform layer was conducive to decrease the aggregation of nano-TiO 2 effectively. Compared with nano-TiO 2 , the core/shell TiO 2 @SiO 2 nanoparticles exhibited better hydration properties in terms of accelerated cement hydration, higher degree of hydration and lower porosity, even though both particles modified cement hydration.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2017
·
IF 1.932
Lin Liu,Xiang-Mei Yu,Bao Zhang,Shu-Xian Meng,Ya-Qing Feng
The performance of dye-sensitized solar cells (DSSCs) consisting of anatase TiO 2 nanoparticles that were synthesized via a hydrothermal method was studied. The synthesized TiO 2 nanoparticles were characterized by X-ray diffraction (XRD), nitrogen sorption analysis, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and UV–vis spectroscopy. Then the J - V curve, electrochemical impedance spectroscopy (EIS), and open-circuit voltage decay (OCVD) measurement were applied to evaluate the photovoltaic performance of DSSCs. Compared with the commercial TiO 2 nanoparticles (P25), the synthesized-TiO 2 nanoparticles showed better performance. By adding diethylene glycol (DEG) before the hydrothermal process, the synthesized TiO 2 nanoparticles (hereafter referred to as TiO 2 -DEG particles) shows narrower size distribution, larger specific surface area, higher crystallinity, and less surface defects than TiO 2 (DEG free) particles. The analysis of photovoltaic properties of DSSCs based on TiO 2 -DEG particles showed that the recombination of electron-hole pairs was decreased and the trapping of carries in grain boundaries restrained. It was believed that the photoelectrode fabricated with the as-prepared TiO 2 nanoparticles improved the loading amount of dye sensitizers (N719), and enhanced the photocurrent of the DSSCs. As a result, the TiO 2 -DEG particle based cells achieved a photo-to-electricity conversion efficiency ( η ) of 7.90%, which is higher than 7.53% for the cell based on TiO2 (DEG free) and 6.59% for the one fabricated with P25.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Liang Yi,Qian Yang,Long Yan,Ning Wang
A series of organophosphate-grafted nano-TiO 2 was synthesized and then applied in amino resin to obtain multifunctional transparent fire-retardant coatings with superior fire resistance, antibacterial and anti-aging properties. Transparency analysis reveals that the addition of nano-TiO 2 slightly decreases the light transmittance of the resulting MTiPPBs coatings, which is still remained a high level of transparency. The results of fire tests show that the presence of nano-TiO 2 exhibits well synergistic effect on strengthening the smoke suppression property and fire resistance of the MTiPPBs coatings, which is ascribed to the formation of more P-containing cross-linked and aromatic structures in the condensed phase that improve the barrier effect of intumescent char against fire, as supported by scanning electron microscope (SEM) and energy dispersion spectrum (EDS) analyses. When the weight ratio of PPB and nano-TiO 2 is 99.7:0.3, the obtained MTiPPB3 coating shows a 69.5% decrement in smoke density rating and an 83.3% decrement in flame spread rating in comparison to MTiPPB0 coating without nano-TiO 2 . The accelerated aging test reveals that the presence of nano-TiO 2 can minimize the blistering, powdering, and cracking phenomena of the multifunctional coatings , thus displaying durable fire-resistant and smoke suppression effects. Meanwhile, the addition of nano-TiO 2 greatly enhances the antibacterial activity of the multifunctional coatings, and MTiPPB3 coating obtains a 45.6% improvement in antibacterial activity index against Escherichia coli compared to MTiPPB0 coating without nano-TiO 2 .
研究领域:
材料科学
·
化学工程
·
火灾安全科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2023
·
IF 1.1
XINRU WANG,XUAN WANG,HAO DING,RUIXIN MA,YU TU,WEI LI
The goal of this paper is to improve the technical level of preparing composite photocatalysts with SiO 2 -supported nano-TiO 2 , expand the selection range of SiO 2 carriers, reduce expenses and understand the influence of SiO 2 crystallization behavior. Natural quartz (Q/SiO 2 ) powder was used as a carrier to prepare a Q/SiO 2 -TiO 2 composite photocatalyst by hydrolyzing a butyl titanate solution and performing high-temperature calcination of the hydrolysate. The performance, morphology, structure and mechanism were tested and characterized. In addition, the as-prepared photocatalyst was compared with other amorphous SiO 2 carrier composite photocatalysts. The results showed that the Q/SiO 2 surface of Q/SiO 2 -TiO 2 contained a uniform load of TiO 2 with a 26.98% proportion. Anatase-type TiO 2 was mainly present, and the size was 5–10 nm. Moreover, Q/SiO 2 and TiO 2 were firmly combined in the form of Si–O–Ti bonds between the interfaces. The degradation rate of Q/SiO 2 -TiO 2 to methyl orange solution was 99.59% under UV irradiation for 60 min, which was equivalent to that of pure nano-TiO 2 . The degradation performance remained stable after four cycles. Compared with other amorphous SiO 2 carriers, Q/SiO 2 exhibited a higher load of TiO 2 . Furthermore, Q/SiO 2 played a more significant role in inhibiting the phase transition of TiO 2 to rutile and improving the photocatalytic performance.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Ya-Zhao Gao,Imran Muhammad,Chun-Mei Zha,Tie-Zhen Ren,Guan Zhang,Zhi-Jun Ren,Jin-Shan Yan,Xue-Jun Zhang
High-temperature corrosion is a major factor contributing to the degradation of industrial components, and composite coatings are one of the effective solutions to this issue. To solve this problem, we design an innovative strategy that utilizes thiol–ene click chemistry to graft nano titanium dioxide (TiO2) onto graphene oxide (GO), forming a composite coating with methyl phenyl silicone resin. This method significantly enhances the thermal stability, corrosion resistance, and self-cleaning properties of the coating. Detailed characterization using SEM, TEM, FTIR, and XRD confirmed the successful covalent bonding of TiO2 with GO, resulting in a composite coating with excellent structural stability. The modification markedly enhances the dispersion and interfacial compatibility of GO-TiO2 within the silicone resin matrix, leading to superior mechanical integrity. Electrochemical analysis reveals that GO-TiO2 extends corrosion pathways and reduces ion permeation, significantly boosting the corrosion resistance of the resin. Notably, the incorporation of just 0.2 wt% GO-TiO2 results in a significant enhancement of the coating thermal stability and its resistance to degradation in high-temperature corrosive environments, while also imparting superior self-cleaning properties. This efficient grafting method offers a transformative framework for developing next-generation nanocomposite coatings with heightened resilience for extreme operational settings.
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
Heritage Science
·
2024
·Vol. 12
·期 1
·1-16
·
IF 2.6
Xie Lina,Li Yuhu,Hu Wenjing,Fang Shiqiang,Chen Xue-Qiang
Damage and fracture of archaeological potteries not only jeopardize the long-term preservation but also hinder their exhibition. To repair these pottery sherds effectively, this study introduces a novel inorganic phosphate-based adhesive and evaluates its effectiveness through a series of experiments. To determine the optimal base adhesive, the paper investigates the influence of varying weight ratios of the H 2 O–H 3 PO 4 system and the Al(OH) 3 –H 3 PO 4 system on properties including tensile lap-shear strength, microstructure, high-temperature resistance and phase composition. However, the original black color of the traditional CuO–phosphate adhesive limits its application. The innovation of this study lies in the addition of nano-TiO 2 to the adhesive, which not only improves the bonding strength but also adjusts the color of the adhesive. This study has defined the optimal formulation (i.e., base adhesive = m[Al(OH) 3 ]:m[H 3 PO 4 ] = 7:100, filler = 10wt% nano-TiO 2 ), and the final product shows no residual acid in adhesives. Additionally, the fracture surfaces are successfully bonded with a high strength of 3.56 MPa. Various ageing tests including dry-thermal ageing, hygrothermal ageing and UV irradiation ageing are conducted to assess the ageing resistance of the inorganic phosphate-based adhesive. The results indicate strong tolerance of adhesive to high temperature and high humidity environment. Preliminary applications in archaeological pottery restoration suggest that the inorganic phosphate-based adhesive offers considerable promise for repairing shattered pottery. Graphical Abstract
研究领域:
考古学
·
材料科学
·
文物保护
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 5
·1-9
·
IF 1.784
Feng Guyu,Wang Xinyue,Zhang Diantang,Xiao Xueliang,Qian Kun
The performance degradation of polypropylene (PP) fibers which induced by ultraviolet (UV) irradiation are commonly defect in service, especially in the outdoor environment. In this study, ZnO coated nano-TiO 2 with resistance in full range of UV irradiation is prepared by ultrasonic-microwave homogeneous precipitation method. The chemical structure, physical–chemical property, and atomic structure and surface morphology of the ZnO coated nano-TiO 2 are systematically investigated by FTIR, XRD, BET and TEM analysis. The uvioresistant PP fibers are prepared by melting blending method with PP and coated nano-TiO 2 as raw materials. The effect of coated nano-TiO 2 on UV resistance of PP fibers is described by carbonyl index, molecular weight and mechanical property. Results showed that PP fibers with coated nano-TiO 2 exhibited excellent UV shielding effect in full range of UV irradiation.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
SYNTHETIC COMMUNICATIONS
·
2012
·
IF 1.062
Xi'an Chen,Huayue Wu,Shun Wang,Shaoming Huang
Nano-TiO2 is an effective heterogeneous catalyst for the ring opening of epoxides with aromatic amines to afford β-amino alcohols in good to excellent yields at room temperature under solvent-free conditions. It was found that the catalyst is recyclable, and the activity of the catalyst was not weakened markedly even after several reaction cycles. In addition, the catalytic activity of TiO2 strongly depends on particle size or surface area.
研究领域:
化学
·
催化材料科学
✓ 已验证
DOI
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2018
·Vol. 84
·期 9
·
IF 3.633
Peng Zhang,Jin-Song Guo,Peng Yan,You-Peng Chen,Wei Wang,You-Zhi Dai,Fang Fang,Gui-Xue Wang,Yu Shen
Pollutant degradation is present mainly in the surface layer of biofilms, and the surface layer is the most vulnerable to impairment by toxic pollutants. In this work, the effects of nanosized TiO2 (n-TiO2) on the average thicknesses of Bacillus subtilis biofilm and on bacterial attachment on different surfaces were investigated. The binding mechanism of n-TiO2 to the cell surface was also probed. The results revealed that n-TiO2 caused biofilm dispersal and the thicknesses decreased by 2.0 to 2.6 μm after several hours of exposure. The attachment abilities of bacteria with extracellular polymeric substances (EPS) on hydrophilic surfaces were significantly reduced by 31% and 81% under 10 and 100 mg/liter of n-TiO2, respectively, whereas those of bacteria without EPS were significantly reduced by 43% and 87%, respectively. The attachment abilities of bacteria with and without EPS on hydrophobic surfaces were significantly reduced by 50% and 56%, respectively, under 100 mg/liter of n-TiO2. The results demonstrated that biofilm dispersal can be attributed to the changes in the cell surface structure and the reduction of microbial attachment ability.IMPORTANCE Nanoparticles can penetrate into the outer layer of biofilm in a relatively short period and can bind onto EPS and bacterial surfaces. The current work probed the effects of nanosized TiO2 (n-TiO2) on biofilm thickness, bacterial migration, and surface properties of the cell in the early stage using the surface plasmon resonance waveguide mode. The results demonstrated that n-TiO2 decreased the adhesive ability of both cell and EPS and induced bacterial migration and biofilm detachment in several hours. The decreased adhesive ability of microbes and EPS worked against microbial aggregation, reducing the effluent quality in the biological wastewater treatment process.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Environmental Science and Technology
·
2018
·Vol. 16
·期 11
·7275-7284
·
IF 2.037
He Huijun,Wu Bin,Yang Chunping
The colloidal stability and photocatalysis of nano-TiO 2 particles were investigated in the presence of fulvic acids (FA) and electrolytes (NaNO 3 , Na 2 SO 4 , Na 3 PO 4 ) at different pH. Results showed that increasing FA concentration, the absolute value of zeta potential of nano-TiO 2 increased and particle size decreased at all pH which promoted the colloidal stability of nano-TiO 2 . Particle size of nano-TiO 2 was larger with the coexistence of FA and electrolytes than with FA only as the concentration of electrolytes was greater than or equal to 0.01 mol/L. The largest particle size occurred in the presence of Na 3 PO 4 , followed by Na 2 SO 4 and NaNO 3 . Particle size of nano-TiO 2 decreased with higher pH and stability further increased in the presence of FA and/or electrolytes. Nano-TiO 2 stabilization was enhanced by increasing FA concentration when the solution pH was 7.0. However, the removal efficiency of atrazine by nano-TiO 2 decreased with the increase in FA concentration. Adding electrolytes (0.01 mol/L), atrazine removal by nano-TiO 2 further decreased, albeit slightly. The inhibitory effect of electrolytes on nano-TiO 2 removal of atrazine was highest for Na 3 PO 4 , followed by Na 2 SO 4 , and NaNO 3 , which were consistent with the results of colloidal stability of nano-TiO 2 . These findings help to better understand the mechanisms and correlation between colloidal stability and photocatalysis of nano-TiO 2 in the presence of FA and electrolytes.
研究领域:
环境科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 5
·4997-5007
·
IF 2.914
Zhang Lixin,Rao Lei,Wang Peifang,Guo Xiang,Wang Yuxiong
Herein, we present the preparation of nano-TiO 2 –silicone resin composite films by double liquid phase spray deposition. The films exhibit better adhesion stability and photocatalytic activity under a hydrodynamic erosion condition than conventional nano-TiO 2 composite films. The TiO 2 layer morphology and effective TiO 2 coverage ratio (CR) were affected by the initial curing time (ICT) of the silicone resin, e.g., the increase in an ICT from 10 to 40 min resulted in a CR change from 79.1 to 98.7%. The surface morphology evolution of composite films was studied under a hydrodynamic erosion period of 4 weeks. Obtained results allowed the 4-week evolution to be divided into four stages (pitting, crack pregnant, banded stripping, and surface stripping periods), additionally revealed that the CR of all samples was remained above 65%. The photocatalytic activity of composite films before and after 4-week hydrodynamic erosion was evaluated by rhodamine B degradation experiments. The 4-week erosion only led to the decrease of the photodegradation efficiencies by less than 40% in all cases. Thus, the fabricated TiO 2 –silicone composite films demonstrated excellent durability and photocatalytic activity under the conditions of long-term hydrodynamic erosion, allowing one to conclude that this work paves the way to the fabrication of next-generation photocatalytic materials for industrial applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2018
·
IF 3.193
Hao Yang,Hui Zhang,Henglun Cheng,Baoqing Shentu
Nano-TiO 2 immobilized antioxidant (TiO 2 -KH550-AG) was prepared to improve the ageing resistance of thermoplastic vulcanizate (TPV) exposed to UV/O 3 . TiO 2 nanoparticles were firstly modified with 3-aminopropyltriethoxysilane (KH550) and then reacted with the antioxidant , 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid (AG), through the acyl chloride reaction followed by the amidation. FT-IR, XPS and TGA measurements confirmed that the antioxidant (AG) was chemically immobilized onto the nano-TiO 2 surfaces. TPV/TiO 2 -KH550-AG nanocomposites were prepared by melt mixing. SEM observation showed that TiO 2 -KH550-AG was homogeneously dispersed into the matrix of TPV. The UV/O 3 ageing test of the samples was carried out in the environment with constant UV intensity of 1.40 mW/cm 2 and ozone concentration of 100 ± 4 mg/m 3 . The ageing resistance behavior of the TPV/TiO 2 -KH550-AG nanocomposites was evaluated by the changes of surface morphology , mechanical properties and carbonyl index during the UV/O 3 ageing test. It was observed that the TPV/TiO 2 -KH550-AG exhibited high stability during the process of UV/O 3 ageing. The results revealed that the anti-ageing efficiency of TiO 2 -KH550-AG was superior to the mixture of the corresponding AG and modified TiO 2 , owing to the better dispersion and migration resistance of TiO 2 -KH550-AG.
研究领域:
材料科学
·
高分子化学
✓ 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）