JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 9
·5543-5554
·
IF 4.22
Huang Mengjun,Peng Di
In forensic science, the demand for the discovery and extraction of latent fingermarks at crime scenes in a fast and convenient way is still urgent. Herein, a rutile Cr- and Sb-codoped TiO 2 nanoparticle was synthesized via homogeneous precipitation and was characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, Raman spectroscopy, and X-ray fluorescence. Subsequently, the as-prepared nanoparticle was used to visualize latent fingermarks using a powder dusting method and to enhance the visualization of bloody fingermarks using a small particle reagent method on porous, semiporous, and nonporous substrates. Notably, the anti-ultraviolet property of this yellow nanoparticle was investigated. This intriguing property contributed to the detection of latent fingermarks on strong-fluorescence or multicolored surfaces in a negative-image manner. Moreover, two potential interaction mechanisms were proposed between hemoglobin and surfactants in bloody fingermark enhancement. This work showed that this rutile TiO 2 nanoparticle doped with Cr and Sb is a versatile eikonogen for the rapid visualization of latent and bloody fingermarks and has high sensitivity, selectivity, contrast as well as wide applicability compared with traditional developing methods.
研究领域:
法医学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 11
·2341-2351
·
IF 8.928
Bo Zhou,Fan Song,Xinyue Ma,Lijun Wang
Graphical The batch is back : A scalable green catalyst system based on a TiO 2 nanoparticle–exfoliated montmorillonite composite catalyst with hard Lewis acid sites and abundant accessible Brønsted acid sites is developed for the rapid preparation of furfural acetals, which are a promising biofuel with high octane value, high calorific value, and high oxidation resistance. Furfural acetals with high octane value, high calorific value and high oxidation resistance are considered promising biofuels or fuel precursors with huge potential demand. However, there are few studies on efficient scalable catalyst systems, including continuous-flow catalyst systems, for their preparation. In this work, TiO 2 nanoparticles supported on exfoliated montmorillonite, with strong Lewis acid sites and abundant accessible Brønsted acid sites, is used to catalyze the acetalization reactions of biomass-derived furfural and alcohols. Low dosage of the catalyst made the reaction reach equilibrium in a very short time (TOF=690–1305 min −1 ) at room temperature with the acetal as the only product. In continuous-flow reactions, the catalyst showed a stable product output with conversion close to that for the batch reaction with a short catalyst-reactant contact time of 150 s. Contrast experiments revealed that both Lewis and Brønsted acid sites on the catalyst were indispensable for maximizing the catalytic performance, and simultaneously activating both furfural and alcohol on the adjacent Lewis and Brønsted acid sites was proposed to be responsible for the high catalytic performance.
研究领域:
化学工程
·
催化科学
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Enmin Zong,Chengyi Zhang,Shaoning Wu,Yijun Gao,Jiayao Yang,Xiaohuan Liu,Pingan Song
Developing an eco-friendly, sustainable and antibacterial adsorbent is significant for actual water treatment. Herein, a bio-based antibacterial adsorbent based on titanium dioxide (TiO 2 ) nanoparticles functionalized chitosan (CS) was prepared through an in-situ hydrolysis strategy using titanium oxysulfate as the source of TiO 2 . The as-obtained CS/TiO 2 nanocomposite was characterized by a variety of analytical techniques. According to the Langmuir mode, the adsorption capacity of CS/TiO 2 reached 23.64 mg P g −1 , almost 8 times higher than that of CS. In addition, the normalized adsorption capacity (adsorption value per Ti) of CS/TiO 2 was calculated to be 102.68 mg P g −1 Ti −1 , much higher than pure TiO 2 (60.11 mg P g −1 Ti −1 ). Moreover, CS/TiO 2 exhibited a highly selective capacity for phosphate removal in the presence of competing anions, and showed high stability in a wide pH range of 3.0–8.0. When the phosphate concentration was 2.0 mg P L −1 , the removal efficiency of phosphate reached 99.5 % and the residual concentration was only 10 μg P L −1 , which meets the USEPA standards for eutrophication prevention and control. In addition, after treatment by CS/TiO 2 , the phosphate concentration of two sewage water samples decreased from 1.50 and 1.0 mg P L −1 to <0.10 mg P L −1 , meeting the standard of level II water based on the Environmental Quality Standard of China (GB3838–2002). Ligand exchange and electrostatic interactions are mainly responsible for phosphate adsorption by CS/TiO 2 . Furthermore, the CS/TiO 2 nanocomposites exhibited excellent antibacterial activity , which could avoid biofouling contamination caused by microorganisms. Benefiting from the above advantages, the as-designed CS/TiO 2 nanocomposite has great potential as a bio-based antibacterial adsorbent for phosphate capture or removal from wastewater.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Guangjian Peng,Yahao Hu,Guijing Dou,Yiheng Sun,Yong Huan,Sung Hoon Kang,Zhongyu Piao
Microencapsulated phase change materials (MPCMs) are often mixed with matrix materials to form phase change composites for energy storage. Typically, MPCMs are easily debonded from the matrix or ruptured, thereby weakening the mechanical properties of composites. This paper aims to simultaneously improve the rupture strength of microcapsules and the bonding strength between microcapsules and matrix to enhance the mechanical properties of composites. The titanium dioxide (TiO 2 ) nanoparticles modified by a silane coupling agent (KH560) were doped into the melamine formaldehyde (MF) shell, forming n-octadecane@MF/TiO 2 hybrid shell MPCMs (HS-MPCMs). The doping of modified TiO 2 nanoparticles reduced supercooling and improved the thermal stability of microcapsules. Compared with MF microcapsules, the rupture strength of HS-MPCMs was increased by an average of 30.4%. The modified TiO 2 nanoparticles also built covalent bonds between microcapsule shell and matrix, which led to better microcapsule/epoxy interface bonding. Thus, the HS-MPCMs/epoxy composites performed higher tensile strength than the unmodified composites. Specifically, the tensile strength of composites was improved by an average of 17.2% at the microcapsule content of 10 wt.% with the aid of the MF/TiO 2 hybrid shell. The reinforced MPCMs/epoxy composites are expected to be used as anti-icing coatings in the aerospace field.
研究领域:
材料科学
·
能源存储
·
航空航天
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Jun Zhang,Wei Li,Mingxiang Zheng,Jiawei Tan,Xinjuan Zeng,Cailong Zhou,Min Zhang,Lin Wang
The rapid growth of the dye industry and the worsening water resource crisis have drawn significant focus to the treatment of dye wastewater. Membrane separation technology is increasingly being utilized in addressing this issue. However, traditional separation membranes face challenges such as susceptibility to contamination and significant decline in subsequent separation permeance. This work utilizes a straightforward brushing technique to effectively apply a coating comprising titanium dioxide (TiO2) nanoparticles and attapulgite (APT) onto a stainless steel mesh (SSM), equipping it with the capability for dye adsorption and separation. Studies show that coatings with different ratios yield varying degrees of coverage on the SSM. A higher concentration of TiO2/attapulgite results in improved coverage on the SSM, creating a denser coating on the mesh surface and the degree of cross-linking of the coating was as high as 92.22%. The coated meshes exhibited superhydrophilicity uniformly and excellent negatively charged properties. Separation experiments of the meshes with different TiO2/attapulgite ratios were conducted by separating simulated dye wastewater with methylene blue (MB) and safranine T (SaT). The results indicate that the prepared meshes achieved a maximum rejection of over 98.0% for MB and over 96.5% for SaT. In addition, the prepared meshes maintained high dye rejection efficiencies (>96%) even after 10 consecutive separation cycles. The above results indicate that the prepared meshes are promising for application in industrial dye wastewater treatment.
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
Nanomaterials
·
2021
·Vol. 12
·期 1
·55
·
IF 5.076
Shichao Song,Yijie Li,Zhuofan Yao,Jie Li,Xiangping Li,Yaoyu Cao
The advanced direct laser printing of functional devices with tunable effective index is a key research topic in numerous emerging fields, especially in micro-/nano-optics, nanophotonics, and electronics. Photosensitized nanocomposites, consisting of high-index materials (e.g., titanium dioxide, TiO2) embedded in polymer matrix, are emerging as attractive platforms for advanced additive manufacturing. Unfortunately, in the currently applied techniques, the preparation of optically functionalized structures based on these photosensitized nanocomposites is still hampered by many issues like hydrolysis reaction, high-temperature calcinations, and, especially, the complexity of experimental procedures. In this study, we demonstrate a feasible strategy for fabricating micro-/nanostructures with a flexibly manipulated effective refractive index by incorporating TiO2nanoparticles in the matrix of acrylate resin, i.e., TiO2-based photosensitized nanocomposites. It was found that the effective refractive index of nanocomposite can be easily tuned by altering the concentration of titanium dioxide nanoparticles in the monomer matrix. For TiO2nanoparticle concentrations up to 30 wt%, the refractive index can be increased over 11.3% (i.e., altering from 1.50 of pure monomer to 1.67 at 532 nm). Based on such a photosensitized nanocomposite, the grating structures defined by femtosecond laser nanoprinting can offer vivid colors, ranging from crimson to magenta, as observed in the dark-field images. The minimum printing width and printing resolution are estimated at around 70 nm and 225 nm, indicating that the proposed strategy may pave the way for the production of versatile, scalable, and functionalized opto-devices with controllable refractive indices.
研究领域:
微纳光学
·
纳米光子学
·
先进制造
✓ 已验证
DOI
高影响因子
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
·
2018
·Vol. 25
·期 2
·1-9
·
IF 3.367
Caiyun Li,Huajiang Wei,Yanping Zhao,Guoyong Wu,Huaimin Gu,Zhouyi Guo,Hongqin Yang,Yonghong He,Shusen Xie
This study aims to monitor and assess the penetration and accumulation of titanium dioxide nanoparticles (TiO
2
NPs) (25 nm and 60 nm) and the penetration of the TiO
2
NPs assisted by diode laser radiation (LR) in human normal endometrium (NE) and uterine leiomyoma (UL) tissues. In the 210 min ex vivo experiments, optical coherence tomography (OCT) and diffuse reflectance (DR) spectral measurement were used to study the changes in optical properties of tissues after TiO
2
NPs suspension administering. The results show that TiO
2
NPs make the OCT signal intensities and DR spectra of both NE and UL tissues increase with time, and larger NPs produce greater signal enhancement. In addition, there are significant differences between NE and UL tissues in terms of the values of attenuation coefficients. The experiment results indicate that the same size of the NPs penetrate faster in UL tissues than that in NE tissues, and 25 nm TiO
2
NPs allow larger penetration depth than 60 nm TiO
2
NPs in tissues. LR can remarkably increase the penetration of TiO
2
NPs in two types of tissues, especially in UL tissues. Analysis of attenuation coefficients and reflectance intensity reveals that the accumulation of the TiO
2
NPs in NE and UL tissues has great influence on the tissue optical properties.
研究领域:
生物医学工程
·
纳米医学
·
妇科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）