Coatings
·
2022
·Vol. 12
·期 10
·1397
·
IF 3.236
Meiman Peng,Liqin Wang,Lang Guo,Jinyi Guo,Liping Zheng,Fuwei Yang,Zhuang Ma,Xing Zhao
Water can trigger freeze–thaw cycles, acid rain corrosion, and microbial colonisation, all of which destroy stone. Water is one of the most influential factors in the destruction of outdoor stone heritage. Therefore, materials with excellent hydrophobic properties and durability are urgently required to effectively retard long-term stone weathering. In this study, two nanoparticles, TiO2and SiO2, were used to modify dodecyltrimethoxysilane (DTMS), a waterproof coating commonly used for stone heritage protection, to fabricate nanocomposite superhydrophobic coatings. The micromorphology, water repellence (water contact angle and capillary water absorption), suitability to protect stone heritage (color change and water vapor permeability), and durability (thermal, light, and chemical stability) of DTMS and nanocomposite coatings were evaluated. The scanning electron microscope (SEM) images revealed that adding 0.5% (w/w) SiO2produced nanoscale roughness on the sandstone surface, leading to superhydrophobicity. The results of ultraviolet -visible (UV–Vis) spectrophotometer showed that adding 0.01% TiO2shielded more than 90% of UV light but accelerated the decrease in the contact angle under UVA irradiation. The addition of SiO2was able to avoid the detrimental effect of TiO2under UV light. The thermogravimetric analysis (TGA) results showed that both SiO2and TiO2nanoparticles improved the thermal stability of the coatings. In particular, the fabricated nanocomposite coating, SiO2and TiO2co-modified DTMS, had excellent water repellence, low color change and outstanding durability, and retained about 85% of the water vapor permeability of the stone, showing promise for stone protection.
研究领域:
材料科学
·
文化遗产保护
✓ 已验证
DOI
高影响因子
PLoS One
·
2017
·Vol. 12
·期 3
·e0174104
·
IF 2.806
Chuanxi Yang,Ming Zhang,Wenping Dong,Guanwei Cui,Zongming Ren,Weiliang Wang
The poly-o-phenylenediamine (PoPD)/TiO 2 nanocomposite was successfully synthesized via ‘in situ’ oxidative polymerization method. The modified photocatalysts were characterized by BET, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrarad spectra (FT-IR), thermogravimrtic analysis (TGA), X-ray photoelectron spectroscopy (XPS), Ultraviolet-visible diffuse reflectance spectrum (UV-Vis DRS) and Photocurrent Test. The results showed that the PoPD exists on the surface of TiO 2 , the presence of PoPD does not impact on the lattice structure and grain size of TiO 2 , and the presence of PoPD enhances the visible response and photoelectric property. The photocatalytic degradation of methylene blue (MB) was chosen as a model reaction to evaluate the photocatalytic activities of TiO 2 and PoPD/TiO 2 . The optimal preparation condition was the molar ratio of oPD to TiO 2 = 3:1, HCl concentration = 1.2 mol/L, the molar ratio of APS to oPD = 1:1. The apparent first-order rate constant k app of PoPD/TiO 2 nanocomposite was 0.0098 min -1 , which is 6 times higher than TiO 2 (0.0016 min -1 ). Meanwhile, the PoPD/TiO 2 nanocomposites showed excellent photocatalytic stability, and the photocatalytic stability was depended on the stability of structure. At last, the photocatalytic mechanism of POPD/TiO 2 nanocomposites was also proposed based on the synergetic effect between TiO 2 and PoPD.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Chemosensors
·
2022
·Vol. 10
·期 7
·277
·
IF 4.229
Huan Wang,Pei Qin,Yun-Hui Feng,Hui-Liang Sun,Hui-Xiang Wu,Bo-Kai Liao,Yue-Bin Xi,Wei Wang
TiO2-based ultraviolet photodetectors have drawn great attention and are intensively explored. However, the construction of TiO2-based nanocomposites with excellent ultraviolet responses remains challenging. Herein, a TiO2nanorod array was successfully prepared on fluorine-doped tin oxide (FTO) conductive glass by a one-step hydrothermal method. Then, polypyrrole (PPy)-TiO2nanorod array composites were designed via subsequent in situ oxidative polymerization. The morphologies, structures, and photocurrent responses of the nanocomposites were systematically investigated. The results demonstrated that polypyrrole-TiO2exhibited a stronger photocurrent response than pure TiO2due to the p-n junction formed between n-type TiO2nanorod arrays and p-type polypyrrole. The PPy-TiO2composite obtained by deposition three times had the best photoelectric properties, exhibiting good performance with a sensitivity of 41.7 and responsivity of 3.5 × 10−3A/W. Finally, the mechanism of the photoelectrical response of PPy-TiO2composites was discussed, guiding the design of high-performance TiO2-based ultraviolet photodetectors.Keywords:titanium oxide;ultraviolet photodetectors;polypyrrole;nanocomposites;p-n junction
研究领域:
材料科学
·
光电技术
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DOI
高影响因子
Advanced Fiber Materials
·
2020
·Vol. 2
·期 2
·118-122
·
IF 0
Sun Yijun,Mwandeje Jackson Beja,Wangatia Lodrick M.,Zabihi Fatemeh,Nedeljković Jovan,Yang Shengyuan
The improvement of the photocatalytic performance of TiO 2 nanofibers (NFs), prepared by electrospinning, is achieved by surface modification with the rhodizonic acid (RhA). The condensation reaction between hydroxyl groups from TiO 2 NFs and RhA is accompanied by the red-shift of optical absorption due to interfacial charge transfer (ICT) complex formation. Crystal structure, morphology, and optical properties of unmodified and surface-modified TiO 2 NFs were analyzed. The photocatalytic performance of prepared samples has been examined through degradation of organic dye methylene blue. Superior photocatalytic activity of surface-modified TiO 2 NFs with RhA is attributed to their enhanced optical properties, i.e., the ability to harvest the photon energy in the visible spectral range.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Zheng Zhang,Yang Wang,Ting Li,Piming Ma,Xuhui Zhang,Bihua Xia,Mingqing Chen,Mingliang Du,Weifu Dong
Poor ultraviolet (UV) stability of polylactic acid (PLA) partially restricts its applications under atmospheric conditions. Titanium dioxide (TiO2) is a common and widely used UV-shielding agent, but detrimental effects often exists on the properties of polymers. In this study, we used polydopamine (PDA) to construct TiO2–PDA hybrid nanoparticles. The introduction of PDA can greatly reduce oxygen vacancies in TiO2, so as to better maintain the stability of the polymer matrix. TiO2–PDA hybrid nanoparticles were synthesized through simple steps and composited with PLA to prepare PLA/TiO2–PDA nanocomposites (noted as PLA/TP). The established PLA/TP films show excellent UV-shielding performance without sacrificing transparency (the transmittance at 550 nm is 85.7%). What’s more, with 0.2 wt % nanoparticles added, the nanocomposite films have a good combination of strength and toughness. The performance improvement of PLA will broaden its application fields, making environmental materials have a wider range of uses and longer service life.
研究领域:
材料科学
·
高分子化学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaotao Yang,Xiaofei Zhang,Yulong Li,Xiuling Li,Xinmiao Liang,Ye Tian,Lei Jiang
In the selective enrichment of phosphorylated proteins (PPs) from biological samples, the non-phosphorylated proteins (NPPs) adhered onto enrichment adsorbents due to the hydrophobic interaction, resulting in poor selectivity and low recovery of target PPs. Herein, superhydrophilic TiO2-coated porous SiO2 microspheres are prepared and boost remarkable selectivity toward standard PP spiked with 2000 mass-fold NPP interference. The outstanding performance of the superhydrophilic microspheres is attributed to the coordination interaction between TiO2 and PPs, and the confined water layer generated from superhydrophilicity avoids the irreversible adsorption of NPPs by keeping NPP inner hydrophobic regions in a compact structure, which is verified by single molecule force spectroscopy, circular dichroism, and quartz crystal microbalance. This strategy for enrichment is expected to solve the challenge in proteomics and sheds light on the interactions between biomolecules and superwettability.
研究领域:
生物化学
·
蛋白质组学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hongjun Kang,Hua Lai,Zhongjun Cheng,Yuyan Liu,Lei Jiang
Recently, the switchable wetting surfaces between superhydrophobicity and superhydrophilicity have been widely studied. However, for almost all existing surfaces, especially inorganic responsive smart surfaces (TiO 2 , ZnO, etc.), their surface microstructures are easily damaged under external force, thus resulting in the loss of superwetting switching and corresponding functions. Realizing the restoration of the damaged surface microstructures would be promising to solve the problem, but it has never been reported. Herein, we advance a fresh strategy to solve the above question by combining shape memory polymer (SMP) and TiO 2 nanoparticles. The as-prepared TiO 2 coated SMP arrays have an excellent responsivity between superhydrophobicity and superhydrophilicity under alternation of UV irradiation and storage in dark. After pressing, the collapsed arrays can only achieve the limited wetting switching between hydrophobicity and hydrophilicity under the same treating condition. Importantly, SMP can help the collapsed surface microstructure recover the initial morphology based on its shape memory effect, and realizing the restoration of superwetting switching. The restorability is ascribed to the cooperative effect between the shape memory property of the SMP and UV-induced surface chemistry variation of TiO 2 nanoparticles. Furthermore, the restorable functional application in droplet storage is also demonstrated. This work provides a fresh idea for designing new smart superwetting surfaces.
研究领域:
材料科学
·
纳米技术
·
表面化学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Ce Liang,Xiaohu Liu,Fei Teng,Yi Li,Shuang Gao
Superhydrophobic coatings have great influence in various applications because of their excellent hydrophobic properties. The focus of current research is to develop superhydrophobic coatings with excellent mechanical and chemical stability. In this work, silane coupling agent KH560 was used to modify titanium dioxide nanoparticles (TiO 2 ) and blend them with epoxy resin E51 (EP). The mixed composite material was sprayed on the substrate for curing treatment. Form TiO 2 /EP superhydrophobic coatings with excellent mechanical and chemical stability. By adjusting the mass ratio of TiO 2 to EP, it is found that the 1:3 TiO 2 /EP coating has excellent mechanical and chemical stability while having a contact Angle of 159.5° ± 1.5°. The layered bone structure brought by the modification of TiO 2 by KH560 gives the coating excellent corrosion resistance. A series of tests have proved that the coating has a wider application prospect in super hydrophobic properties and harsh outdoor conditions.
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 THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 8
·e71094
·
IF 4.2
Weijia Guo,Bowen Yin,Hui Zhang,Xingchen Zhang,Chongyang Zhang,Qingshuo Zhang,Zhenxing Yue
The development of high-power millimeter-wave technology introduces new requirements on microwave dielectric ceramics. In addition to lower dielectric loss, higher thermal conductivity is also needed to meet heat dissipation demands. Developing high-thermal-conductivity microwave dielectric ceramics with larger relative permittivity ( ε r ) would facilitate the miniaturization of high-power devices. Adding TiO 2 to the α-Al 2 O 3 matrix can adjust the temperature coefficient of resonant frequency ( τ f ) to near zero while increasing ε r , making it an effective approach to obtain high thermal conductivity and low-loss microwave dielectric ceramics. However, systematic defect analysis of the Al 2 O 3 –TiO 2 composition is still lacking. This work investigates the dielectric and thermal properties of the Al 2 O 3 –TiO 2 composition from a defect perspective. By combining low-frequency dielectric spectra with thermally stimulated depolarization current (TSDC) techniques, it was found that the solid solution of Al 3+ in the rutile TiO 2 phase suppresses the activity of defects such as oxygen vacancies. However, the introduction of Ti 4+ into the Al 2 O 3 phase introduces aluminum vacancies (
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Jishuang Yang,Tian Han,Ruijing Zhang,Yuxin Miao,Yifan Su,Shanhu Liu,Ruimin Xing
Hydrogen production through water electrolysis emerges as the most viable method, holding strategic significance for achieving sustainable development at national and societal levels. In this work, CoMoS@TiO2 heterostructures were prepared via the hydrothermal method and thermal vulcanization on Ti substrate, where CoMoS nanosheets were vertically grown on TiO2 nanobelt arrays. The CoMoS@TiO2 heterostructures were tested as hydrogen evolution electrocatalyst in 1 M KOH, with the optimal overpotential of 112 mV at a current density of 10 mA cm–2 and merely 5% activity degradation after 100 h stability testing. The enhanced HER activity originates from synergistic effects: (i) TiO2 nanobelt arrays offer abundant anchoring sites and excellent alkaline stability; (ii) rich heterojunction interfaces between CoMoS nanosheets and TiO2 nanobelts maximize active site exposure; (iii) improved conductivity enabled by CoMoS enhances charge transfer.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2026
·
IF 6.9
Weihan Zhang,Xueli Huang,Xiaoning Zhang,He Huang,Bing Sun,Wei Jiang,Qiya Wang,Na Liu
Background Existing molybdenum-based catalysts exhibit unsatisfactory performance in coal tar hydro-upgrading due to limited active sites and weak cracking capability. Methods Supported NiMoS x @TiO 2 catalysts with a tunable Ni/Mo atomic ratio were prepared via a two-step method and applied in coal tar hydrogenation. Findings Importantly, Ni shows dual regulation over MoS 2 formation. With Ni/Mo ≈ 0.1, Ni promotes the conversion of Mo 7 S x O (21− x ) intermediates to highly dispersed, truncated MoS 2 slabs (1–2 layers, 3–8 nm), enhancing nucleation while suppressing stacking and achieving a 64.99 % gasoline and diesel yield. When Ni/Mo ≥ 0.3, excess Ni consumes sulfide to form NiS x and occupies TiO 2 anchoring sites, hindering MoS 2 growth and driving slab fusion into thicker aggregates (4–8 layers, 20–40 nm) that bury edges. This study reveals Ni’s dual-regulation mechanism on MoS 2 nucleation and layer-number evolution, which governs edge-site exposure and dictates coal-tar hydro-upgrading performance.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Haipeng Hu,Zhicheng Dai,Zijian Ding,Wei Yan,Yuanping Chen,Yingcong Wei,Jing Xu
Understanding the active species is paramount for the rational design of high-efficiency photoelectrocatalysts, especially given that material structures frequently undergo substantial reconstruction under operando conditions. We address this challenge by investigating the dynamic phase evolution of a TiO 2 /WO 3 (WTO) heterostructure during the photoelectrocatalytic hydrogen evolution reaction (HER). Crucially, cathodic bias drives a rapid and profound surface reconfiguration, enabling the in situ creation of the true catalytic species, H 0.53 WO 3 , while simultaneously introducing numerous oxygen vacancies (O V ). This structural transition is macroscopically evident as electrochromism, shifting from a W 6+ -rich yellowish-white state to a W 5+ -rich deep blue state. Mechanistic analysis identifies this dynamic phase change as the key to catalyst activation, driving an exponential enhancement in performance by facilitating a nearly 30-fold increase in carrier concentration (from 9.4 × 10 20 to 2.7 × 10 22 cm −3 ), superior charge transport kinetics, and significantly expanded visible-light absorption. Consequently, the reconfigured TiO 2 /H 0.53 WO 3 (H-WTO) exhibits a hydrogen evolution rate of 274.1 μmol·h −1 ·cm −2 at −1.0 V vs. RHE in pure water, which is approximately 480 times higher than that of pure TiO 2 . These findings highlight the critical role of electrochromism-induced phase transitions in activating transition-metal oxides and provide mechanistic insights into designing dynamically reconfigurable heterostructures for efficient PEC hydrogen production.
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DOI
高影响因子
危险品化学品经营许可证（带存储）