PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 3
·035966
·
IF 2.6
Chunxin Wang,Jun Xie,Qi Liu,Yaxuan Liu,Qing Xie
According to the problems of poor insulation and local temperature rise of polypropylene film, a new nano-filler was studied, and the mechanism of improving insulation and thermal conductivity was analyzed. TiO2 with high dielectric constant is combined with Al2O3 with excellent thermal conductivity in the form of a core–shell structure. TiO2 increases the dielectric constant of polypropylene films, and shell Al2O3 introduces high thermal conductivity and assumes the role of dielectric buffer layer. Compared with pure PP, the breakdown voltage of PP/TiO2 is increased by 6.05%, the thermal diffusivty coefficient is increased by 110.67%, the breakdown voltage of PP/TiO2@Al2O3 is increased by 37.05%, and the thermal diffusivity coefficient is increased by 266.85%. Experimental and simulation results show that TiO2 introduces low-density traps, TiO2@Al2O3 introduces high-density deep traps, and Al2O3 modifies the surface defects of high-dielectric nanoparticles and increases the equivalent interface region. Based on the analysis of the experimental results with different mass fractions, this paper proposes the optimal filling ratio of the new core–shell, which provides a new method for the composite dielectric to improve the insulation and thermal conductivity at the same time.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tengfei Wang,Qing Pang,Boyu Liu,Hongyu Wang
Titanium dioxide (TiO 2 ), once considered a promising material for microwave absorption, still faces significant challenges in achieving broadband absorption performance. To address this issue, herein, a simple approach is reported for successfully introducing defects and crystalline/amorphous heterostructures onto mesoporous TiO 2 (Meso-am-TiO 2-x ). This study demonstrates the superior microwave absorbing properties of Meso-am-TiO 2-x , particularly in the low-frequency range. A reflection loss of up to −25.7 dB is achieved with a thickness of 4.6 mm, and the effective absorption bandwidth (EAB) value extends to 4.32 GHz. The experimental results indicate that the synergistic effects of the high specific surface area of mesoporous TiO 2 , defects-induced conduction loss, defect-induced dipole polarization loss, and interfacial polarization loss between the crystalline and amorphous heterostructures enhance the microwave absorption properties of Meso-am-TiO 2-x . This study provides insights toward developing innovative low-frequency broadband TiO 2 absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Peng Xiang,Congming Tang,Kai Ma,Xinli Li
Solar-driven interfacial evaporation for sustainable production of clean water from seawater and organic wastewater is viewed as a cutting-edge and practical technology to solve the shortage of fresh water. Here, we provide a novel strategy for constructing oxygen vacancy-rich In 2 O 3 /TiO 2 composite to apply in water purification . It is found that oxygen vacancy enhances light absorbance, reduces light reflection, and decreases the thermal conductivity , being beneficial for photothermal conversion and heat confinement. On the other hand, oxygen vacancy-rich In 2 O 3 /TiO 2 composite offers an excellent photocatalytic degradation, which can improve the quality of the purified water and keep surface and interface clean, and thus enhance durability of photothermal material. To compare with In 2 O 3 /TiO 2 , In 2 O 3 /TiO 2 * with rich oxygen vacancies markedly enhances the evaporation rate of pure water from 1.04 to 1.51 kg m −2 h −1 under 1 sun illumination , corresponding photothermal conversion efficiencies of 58.6% and 90.3%, respectively. Furthermore, the evaporator constructed with In 2 O 3 -TiO 2 * displayed 1.47 and 1.49 kg m −2 h −1 for seawater and lake water , respectively, close to pure water under 1 sun illumination. Besides, this evaporator also offered an excellent purification and photocatalytic degradation for organic wastewater during the solar-driven evaporation. Importantly, this evaporator also could synergistically generate electricity, achieving a maximum electrical power of 1.23 W m −2 under 1 sun. This work demonstrates the preponderance of the oxygen vacancy-rich material, and expands the application of the defected In 2 O 3 /TiO 2 composite in solar-driven interfacial evaporation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 2
·1-8
·
IF 1.784
Bi Yong-guang,Liu Di
The effect of calcination temperature and catalyst dosage on degradation rate of methyl orange has been investigated and 0.04 g TiO 2 with 700 °C calcination temperature was selected as the object of doping due to its higher degradation efficiency (99% in less than 1 h), Fe 3 O 4 modified with citric acid was used to improve the recovery and reuse of catalyst, the effect of doping amount of Fe 3 O 4 on the photo-catalytic efficiency of methyl orange has been discussed, and the results showed that the methyl orange degraded above 97% with 20 mg Fe 3 O 4 doped into TiO 2 when the TiO 2 @Fe 3 O 4 was used three times. The particles were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photo-electron spectroscopy; the magnetic properties were measured by PPMS-DynaCool type vibrating magnetometer; the composite showed excellent magnetic response with saturation magnetization of 9.5 emu g −1 . Zeta-potential analysis indicated that TiO 2 (3.6 mV) and Fe 3 O 4 (− 16.8 mV) are linked by electrical attraction, demonstrating that doping of Fe 3 O 4 is beneficial to the recycle and reuse of catalyst and improves the photo-catalytic efficiency, and TiO 2 @Fe 3 O 4 is suitable for industrial production.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Dingyi Wang,Tingting Zhi,Lihong Liu,Li Yan,Wei Yan,Yinyin Tang,Bin He,Ligang Hu,Chuanyong Jing,Guibin Jiang
Nanomaterials play a crucial role in various areas due to their extraordinary chemical and physical properties. Loading microscopic nanomaterials onto macrostructures is inevitable for their implementation from laboratory experiments to practical applications. Nevertheless, the geometries of conventional supporting structures are usually limited and nanomaterials are easy to be inhomogeneously distributed, aggregated, and lost. Therefore, controllably configuring nanomaterials into sophisticated three-dimensional macroscopic structures without sacrificing their inherent properties remains challenging. Here we utilize the advantages of 3D printing technology to realize this purpose. As a proof-of-concept, the application of 3D stereolithography printed macrostructures containing TiO 2 nano particles (TiO 2 NPs) for direct adsorption removal of As(III) in water was demonstrated. The morphology and distribution of TiO 2 NPs mounted on printed macrostructures were initially characterized. Then batch adsorption experiments were conducted to investigate the effect of the 3D printing process, TiO 2 NPs doped concentration and TiO 2 NP size as well as adsorption kinetics and isotherms. We also demonstrated that 3D printed adsorption structures could be easily reused over 10 times and were effective for raw arsenic-polluted groundwater samples. Our findings show that 3D printing provides a promising route to design and fabricate customized macrostructures endowed with specific properties of nanomaterials.
研究领域:
环境科学
·
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Shiyu Yu,Qianqian Zhao,Jiaming Zhu,Genghao Gong,Yunxia Hu
In this study, TiO 2 nanocages with a hollow structure were integrated into the polyvinylidene fluoride co-hexafluoropropylene (PH) spinning solution, leading to the fabrication of a novel PH/TiO 2 electrospun nanofiber membrane (PH/TiO 2 ENM) through electrostatic spinning. The incorporation of TiO 2 nanocages resulted in the formation of abundant micro-nano structures on the PH nanofiber surface, enhancing membrane roughness and hydrophobicity. Additionally, the hollow nanostructure of TiO 2 nanocages effectively reduced the thermal conductivity of the ENMs. This reduction in thermal conductivity mitigated the temperature polarization effect, thereby increasing mass transfer driving force for the ENMs. The maximum water flux of the PH/TiO 2 ENM reached ∼57.9 L m −2 h −1 (LMH), which was approximately 3.7 times higher than that of the original PH ENM. In addition to the formation of micro-nano structures on PH nanofibers, the presence of TiO 2 nanocages facilitated the attachment of more low-surface-energy FAS molecules, improving the resistance of them to fouling and anti-wetting properties against both inorganic and organic contaminants, even in the presence of SDS, in a composite feed solution during the DCMD process. Moreover, even after prolonged exposure to a composite salt solution, this membrane also exhibited exceptional anti-fouling properties and stable desalination performance during a 168 h long-term stability test.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS
·
2024
·
IF 2
Xing-Fei Guo,Quan Li,Hai-Tao Ren,Jing Wang,Xu Han
Mesoporous TiO 2 with a homogeneous Bi-Ag bimetallic distribution (Bi@Ag@MTs) can be obtained by calcination of a titanium-based metal organic framework (MOF, MIL-125) with Bi and Ag loading and applied to the photocatalytic reduction of nitrate using formic acid as a hole scavenger. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and energy dispersive spectrometer (EDS) analyses show that Ag(I) and Bi(III) are present in MTs as fine clusters and Bi@Ag@MTs have a specific pancake structure, which provides a good carrier for photocatalytic reaction. The contents of Ag and Bi in Bi@Ag@MTs can be up to 2.28 wt% and 0.54 wt% analysed by Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES). Under UV irradiation, Bi@Ag@MTs(0.2,0.4) showed a high reduction rate (3.28 h −1 , 4.2 times that of P25), high conversion (100 %, 1.3 times that of P25) and high N 2 selectivity (89.2 %, 2.1 times that of P25) for nitrate reduction. In addition, Bi@Ag@MTs(0.2,0.4) showed good reusability, with the respective NO 3 − conversion and N 2 selectivity still reaching 82.2 % and 78.0 % after four cycles. X-ray photoelectron spectroscopy (XPS) analysis showed that under UV irradiation, part of Ag(I) would be reduced to Ag 0 , and the formed Ag-Ag 2 O structure helped to improve the photocatalytic activity of the catalyst. This preparation strategy provides assistance in the design of photocatalytic materials with significant activity and durability for nitrate reduction.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Meng Zhang,Xuezhang Xiao,Bosang Luo,Meijia Liu,Man Chen,Lixin Chen
Magnesium hydride has been seen as a potential material for solid state hydrogen storage , but the kinetics and thermodynamics obstacles have hindered its development and application. Three-dimensional flower-like TiO 2 @C and TiO 2 were synthesized as the catalyst for MgH 2 system and great catalytic activities are acquired in the hydrogen sorption properties. Experiments also show that the flower-like TiO 2 @C is superior to flower-like TiO 2 in improving the hydrogen storage properties of MgH 2 . The hydrogen desorption onset and peak temperatures of flower-like TiO 2 doped MgH 2 is reduced to 199.2 °C and 245.4 °C, while the primitive MgH 2 starts to release hydrogen at 294.6 °C and the rapid dehydrogenation temperature is even as high as 362.6 °C. The onset and peak temperatures of flower-like TiO 2 @C doped MgH 2 are further reduced to 180.3 °C and 233.0 °C. The flower-like TiO 2 @C doped MgH 2 composite can release 6.0 wt% hydrogen at 250 °C within 7 min, and 4.86 wt% hydrogen at 225 °C within 60 min, while flower-like TiO 2 doped MgH 2 can release 6.0 wt% hydrogen at 250 °C within 8 min, and 3.89 wt% hydrogen at 225 °C within 60 min. Hydrogen absorption kinetics is also improved dramatically. Moreover, compared with primitive MgH 2 and the flower-like TiO 2 doped MgH 2 , the activation energy of flower-like TiO 2 @C doped MgH 2 is significantly decreased to 67.10 kJ/mol. All the improvement of hydrogen sorption properties can be ascribed to the flower-like structure and the two-phase coexistence of TiO 2 and amorphous carbon . Such phase composition and unique structure are proved to be the critical factor to improve the hydrogen sorption properties of MgH 2 , which can be considered as the new prospect for improving the kinetics of light-metal hydrogen storage materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Mohammadreza Rostami,Biao Yang,Xiaochuan Ma,Sifan You,Jin Zhou,Meng Zhang,Xuefeng Cui,Haiming Zhang,Francesco Allegretti,Bing Wang,Lifeng Chi,Johannes Barth
n-Armchair graphene nanoribbons (nAGNRs) are promising components for next-generation nanoelectronics due to their controllable band gap, which depends on their width and edge structure. Using non-metal surfaces for fabricating nAGNRs gives access to reliable information on their electronic properties. We investigated the influence of light and iron adatoms on the debromination of 4,4”-dibromo-p-terphenyl precursors affording poly(para-phenylene) (PPP as the narrowest GNR) wires through the Ullmann coupling reaction on a rutile TiO2(110) surface, which we studied by scanning tunneling microscopy and X-ray photoemission spectroscopy. The temperature threshold for bromine bond cleavage and desorption is reduced upon exposure to UV light (240-395 nm wavelength), but the reaction yield could not be improved. However, in the presence of codeposited iron adatoms, precursor debromination occurred even at 77 K, allowing for Ullmann coupling and PPP wire formation at 300-400 K, i.e., markedly lower temperatures compared to the conditions without iron adatoms. Furthermore, scanning tunneling spectroscopy data reveal that adsorbed PPP wires feature a band gap of ≈ 3.1 eV.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Xiaotong Gu,Ning Qin,Guangfeng Wei,Yiqiong Hu,Ya-nan Zhang,Guohua Zhao
It is stubborn to remove the lowly concentrated phthalic acid esters (PAEs) that usually coexist with other highly concentrated but low-toxic pollutants in municipal sewage. Herein, we report a novel strategy for completely removing the PAEs over a bi-functional {001}TiO 2 surface (with highly exposed {001} facet), which not only serve as functional sites to specifically adsorb the target PAEs pollutants, but also contribute to an enhanced oxidation ability. The adsorption behavior of PAEs on {001}TiO 2 is analyzed deeply through kinetic experiments combining with in situ ATR-FTIR spectroscopy and theoretical calculations. The results reveal that the adsorption capacities of PAEs on {001}TiO 2 are about 4–5 times higher than that on TiO 2 , both of which follow the pseudo-second-order and Langmuir model. This is mainly attributed to the interfacial Lewis Acid-Base Pair between {001} facet Ti 5c sites and C O of PAEs. Benefitting from the specific adsorption capability toward target pollutant and enhanced oxidation ability of {001} facets, nearly 100% of DMP or DEP in simulated wastewater can be eliminated by {001}TiO 2 within 2 h illumination, and the relevant degradation rate constants ( k ) (3.67 h −1 for DMP and 2.19 h −1 for DEP) are 5.73 and 3.08 folds higher than that of pure TiO 2 , respectively. In the application of municipal wastewater , nearly 76% of DMP and 85% DEP can be eliminated by {001}TiO 2 within 2 h illumination, which are nearly 3–6 fold higher than that of pure TiO 2 .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xiaolei Bao,Huiliang Li,Zeyan Wang,Fengxia Tong,Mu Liu,Zhaoke Zheng,Peng Wang,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Yuchen Fan,Zhiyong Li,Baibiao Huang
Photocatalytic selective oxidation of alcohols into corresponding aldehydes has received enormous attention. However, it remains a great challenge to explore photocatalysts with high conversion efficiency and selectivity. Herein, we developed a composite consisted of TiO 2 and Ti 3 C 2 through a simple calcination of Ti 3 C 2 nanosheets. It was found that Ti 3 C 2 could stabilize the oxygen vacancies and Ti 3+ species in the TiO 2 /Ti 3 C 2 composite, which could subsequent promote the production of active intermediates during the photocatalytic oxidation of benzyl alcohol (BA) to benzaldehyde (BAD). Additionally, the valence band of TiO 2 in the composites was found to be up-shifted, which would avoid the further oxidation of BAD and enhance selectivity. As a result, the optimal composite exhibits the BA conversion efficiency of 97 % and BAD selectivity of 98 %, which is 2.8 and 1.2 folds higher than that of pristine TiO 2 . Our work may provide insights for designing efficient photocatalysts for selective oxidation of alcohols.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yongwei Cai,Qi Zhao,Xuejun Quan,Wei Feng,Qingkuo Wang
Superhydrophobic and superoleophilic meshes have attracted great attention in oil/water separating application. However, superhydrophobic surfaces are not only complicated in preparation but also easy to break in practical applications. In this paper, we prepared fluorine-free hydrophobic hexadecyltrimethoxysilane (HDTMS)-TiO 2 coated meshes with properties of cost-effectiveness, easy to manufacture, and high separation efficiency by a liquid phase deposition method. The surface topography , composition , and functional groups of the meshes were characterized by field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Fourier transform microscopic infrared spectrometer (FT-IR) spectrum, respectively. A new gravity-driven oil/water separator was designed for the separation experiments. The separation efficiency of the hydrophobic HDTMS-TiO 2 coated meshes maintained over 97.8% after 35 separating cycles. This study indicated that the superhydrophobicity of the separating mesh was nonessential for the highly efficient oil-water separation. The fluorine-free hydrophobic HDTMS-TiO 2 coated meshes provided an economical and beneficial solution to treat industrial oily wastewater mixtures and environmental oil spills.
研究领域:
材料科学
·
环境工程
✓ 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）