ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Junli Guo,Lingling Yang,Huijie Xu,Chenxi Zhao,Zhenqing Dai,Zhida Gao,Yanyan Song
The level of hydrogen sulfide in the brain and vasculature has long been associated with human health and diseases. Hence, simple and robust analytical tools allowing determination of hydrogen sulfide levels are highly desirable. In this work, a biomineralization-driven ion gate in TiO2 nanochannel arrays for H2S sensing was designed and developed. The formed CuS precipitation decreased the transmembrane current in the presence of bovine serum albumin used as biological mineralizer. Label-free assay for sensing of intracellular S2– was achieved based on changes in ionic current with a detection limit of 56 MCF-7 cells. More importantly, the proposed sensing strategy was promising for reusable application through dissolution of CuS in an acidic media (pH = 1).
研究领域:
生物传感
·
医学诊断
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Yi Wu,Kai Yan,Guilin Xu,Chenguang Yang,Dong Wang
Re-entrant geometries can effectively trap air pockets, increase air/liquid interface fraction, prevent the penetration of low surface tension organic liquids, and achieve super-oleophobic performance. However, the creation of re-entrant geometries usually involving expensive lithographic tools, or complicated chemical procedures, and cannot be applied on a large scale, such super-oleophobic surfaces are unsuitable for practical application. Constructing hierarchical micro/nanostructure on substrates is a feasible solution to achieve super-oleophobicity through facile spraying method. Herein, we report a super-oleophobic TiO 2 /SiO 2 composite coatings by taking advantage of an exceedingly simple spraying method. The dendritic structures produced by spraying the TiO 2 /SiO 2 mixture play the critical role in obtaining the re-entrant geometry required for oleophobic surface, and the introduction of micron-scale TiO 2 particles and nano-scale SiO 2 particles provide an enough dual-scale rough structure for the coating. The TiO 2 /SiO 2 composite coatings exhibit superior repellence to high and low surface tension liquids as well long-term durability. This design strategy may provide useful guidelines for the fabrication of particle-based spray-coated super-oleophobic surfaces.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Lin-Yu Zhou,Shao-Bo Cao,Liang-Liang Zhang,Guolei Xiang,Xiao-Fei Zeng,Jian-Feng Chen
Supports can widely affect or even dominate the catalytic activity and selectivity of nanoparticles because atomic geometry and electronic structures of active sites can be regulated, especially at the interface of nanoparticles and supports. However, the underlying mechanisms of most systems are still not fully understood yet. Herein, we construct the interface of Co3O4/TiO2 to boost ammonium perchlorate (AP) catalytic decomposition. This catalyst shows enhanced catalytic performance. With the addition of 2 wt % Co3O4/TiO2 catalysts, AP decomposition peak temperature decreases from 435.7 to 295.0 °C and activation energy decreases from 211.5 to 137.7 kJ mol–1. By combining experimental and theoretical studies, we find that Co3O4 nanoparticles can be strongly anchored onto TiO2 supports accompanied by charge transfer. Moreover, at the interfaces in the Co3O4/TiO2 nanostructure, NH3 adsorption can be enhanced through hydrogen bonds. Our research studies provide new insights into the promotion effects of the nanoparticle/support system on the AP decomposition process and inspire the design of efficient catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Low-Carbon Technologies
·
2023
·
IF 2.3
Yang Mengdi,Liu Guangyan,Zhao Wei,Meng Fanbin,Lao Youliang,Liang Yi
The balance of light transmittance, durability and self-cleaning performance of the coating film is the main reason that hinders the wide application of photocatalytic self-cleaning coating on building exterior glass. In this article, TiO2 powder was prepared with different concentrations of tetrabutyl titanate, hydrochloric acid and ethanol; and following with compounded polyvinyl alcohol (PVA) and waterborne polyurethane as adhesives; the mixed composite coating was loaded on the glass surface by spraying method to obtain superhydrophilic glass with self-cleaning properties. The physical and chemical properties of TiO2 composite films were characterized and tested by diffraction, scanning electron microscopy, optical contact angle measuring instrument and photocatalytic testing system. The results showed that the X-ray diffractometer analysis of the powder obtained with different alcohol-ester ratios showed that the crystal synthesis was successful, and the grain size conformed to the nanometer standard. TiO2 dispersion with a concentration of 0.08 g/L, after 30 min of irradiation with an ultraviolet (UV) lamp, the methyl orange added dropwise in the solution can be completely degraded. With the increase of TiO2 concentration, the photocatalytic efficiency increased rapidly, the contact angle decreased, when the TiO2 concentration reached 0.3% and 3% binder compounding, the surface of the composite coating film was still smooth at the nanometer level, the visible light transmittance was between 86.95 and 88.89%, and the contact angle was reduced from the initial 46.49 to 14.89° after 2 h of UV illumination. After 5 repeated degradation experiments and outdoor 180-d standing test, the composite coating film has recyclability and good durability. Therefore, TiO2 composite coating prepared by this method has a wide application prospect in the daily cleaning and subsequent maintenance of building glass.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yunning Chen,Lu Yang,Yingnan Sun,Renquan Guan,Di Liu,Jie Zhao,Qingkun Shang
A CDs@Cu-HQCA/TiO 2 flower composite photocatalyst (CDs: carbon dots, HQCA : 8-hydroxyquinoline-5-carboxylic acid) was constructed by exploiting the synergy of complex-sensitization, TiO 2 -morphology control, and carbon dot-surface modification. The photocatalytic degradation of phenol, norfloxacin, tetrabromobisphenol A and Cr (VI) by Cu-HQCA/TiO 2 particle, tube, diamond and flower-like show that the Cu-HQCA complex effectively extends the visible light absorption range of composite photocatalysts, and the flower morphology of TiO 2 not only improves the adsorption of pollutants but also enhances the photoelectric response of the composite photocatalyst. In this manner, a CDs@Cu-HQCA/TiO 2 flower catalyst that demonstrates excellent performance for the removal of dexamethasone, which does not degrade well naturally, was prepared, which delivered a rate of degradation of 99.4% and a degree of mineralization of 77.4% for dexamethasone. Possible degradation sites and dexamethasone degradation products were studied by combining computational chemistry with high-resolution mass spectrometry, and a possible mechanism for photogenerated carrier transmission and separation in the CDs@Cu-HQCA/TiO 2 flowers is proposed.
研究领域:
材料科学
·
环境科学
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Ling Gan,Yifan Wu,Haiou Song,Chang Lu,Shupeng Zhang,Aimin Li
Self-doped TiO 2 nanotube arrays (DNTA) were prepared for the electrooxidation of resistant organics. The anatase TiO 2 NTAs had an improved carrier density and conductivity from Ti 3+ doping, and the oxygen-evolution potential remained at a high value of 2.48 V versus the standard hydrogen electrode, and thus, achieved a highly enhanced removal efficiency of phenol. The second anodization could stabilize Ti 3+ and improve the performance by removing surface TiO 2 particles. Improper preparation parameters (i.e., a short anodization time, a high calcination temperature and cathodization current density) harmed the electrooxidation activity. Although boron-doped diamond (BDD) anodes performed best in removing phenol, DNTA exhibited a higher mineralization of phenol than Pt/Ti and BDD at 120 min because intermediates were oxidized once they are produced with DNTA. Mechanism investigations using reagents such as tert-butanol, oxalic acid , terephthalic acid, and coumarin showed that the DNTA mineralization resulted mainly from surface-bound OH, and the DNTA produced more than twice the amount of OH compared with BDD. The free OH on the BDD electrode was more conducive to initial substrate oxidation, whereas the adsorbed OH on the DNTA electrode mineralized the organics in situ. The preferential removal of p -substituted phenols on DNTA was attributed mainly to their electromigration and the aromatic intermediates that are hydrophobic were beneficial to mineralization.
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
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Shuqing Xiang,Mingqian Wang,Li Li,Jian Shen
The gas therapy of some endogenous signaling molecules to treat diseases has caused extensive research, among which NO gas has shown great potential in fighting infection with various pathogens, promoting wound healing, etc. Here, we propose a photothermal/photodynamic/NO synergistic antibacterial nanoplatform by loading L -arginine (LA) on mesoporous TiO 2 and then encapsulating it with polydopamine . The obtained TiO 2−x [email protected] nanocomposite possesses both the excellent photothermal effect and ROS generation ability of mesoporous TiO 2 , and the release of nitric oxide (NO) from L -arginine under near-infrared (NIR) light irradiation , while the sealing layer of PDA could induce NIR-triggered NO controlled release. In vitro antibacterial experiments confirmed that the synergistic effect of TiO 2−x [email protected] nanocomposites has excellent antibacterial effects against Gram-negative and Gram-positive bacteria, while in vivo experiments showed that it has lower toxicity. It is worth noting that compared with the pure photothermal effect and ROS, the generated NO showed a better bactericidal effect , and NO had a better ability to promote wound healing. In conclusion, the developed TiO 2−x [email protected] nanoplatform can be used as a nanoantibacterial agent, which can be further explored in the related biomedical field of photothermal activation of multimodal combined antibacterial therapy.
研究领域:
纳米技术
·
生物医学工程
·
药学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2012
·
IF 0
Hai Feng Chen,Ting Yan
New nano nickel-doped titanium dioxide composites had been produced by a conducting sol-gel method. The alginate gel was used as a template to prevent the conglomeration of the inorganic materials. In this experiment, nickel nitrate, tetrabutyl titanate and sodium alginate were used as main materials to prepare different amount nickel-doped TiO2 particles. The amount of Ni was studied from 0 to 9 mol.-% (where mol.-% refers to the Ni/TiO2 molar ratio), and the Ni/TiO2 composites were characterized by XRD, FT-IR, TG-DTA, and we carried out doping amount, catalyst amount and illumination time influence on photocatalytic performance of nano Ni/TiO2 composite in aqueous methyl orange. The activity of TiO2 gradually increased with the increasing of doping amount, and there was highest catalytic efficiency when Ni = 9 % mol.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
FIBERS AND POLYMERS
·
2021
·Vol. 23
·期 1
·254-262
·
IF 2.153
Jiang Hui-Yu,Ouyang Ze-Yu,Hu Rong,Wan Jun,Zhu Jun-Jiang
Titanium dioxide (TiO 2 ) could improve the self-cleaning performances of cotton fabric owing to its good photocatalytic performances. However, the fast recombination rate of the photogenerated electron-hole pairs and narrow photoresponse range of TiO 2 limit its wide application. In this work, Ag 2 S and reduced graphene oxider (rGO) were compounded with TiO 2 , and the composite was loaded on the surface of cotton fabric by hydrothermal method to enhance the self-cleaning performance of cotton fabric. The close contact between Ag 2 S and TiO 2 increases the light response range. Then, rGO could effectively transfer photogenerated electrons, prolong the recombination time of carriers and improve the photocatalytic efficiency. The cotton fabric was characterized by XRD, SEM, Raman and fluorescence spectra. The photocatalytic degradation of methylene blue under visible light was studied. The results showed that TiO 2 /Ag 2 S/rGO adhered uniformly on the surface of cotton fabric and had good adhesion properties. In addition, under visible light irradiation, cotton fabric has excellent photocatalytic self-cleaning performance, washing resistance and rub resistance.
研究领域:
材料科学
·
纺织工程
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 63
·58452-58457
·
IF 3.289
Minghui Wang,Liying Cui,Songyang Li,Zhuoxin Li,Tianliang Ma,Guoyou Luan,Wei Liu,Fanli Zhang
Hollow nano-tubes of TiO2 and TiO2@ZnO hybrids were produced by a facile and mild approach combining an electrospinning technique and soaking method, followed by calcination. During the synthesis process, the electrospinning procedure provides the templates for the fabrication of hollow nano-tubes by producing the PS fibres, which are porous and enable the immobilization of amorphous TiO2 through the soaking method. After that, the composite fibers of TiO2/PS and TiO2@ZnO/PS were calcined into pure TiO2 and TiO2@ZnO tubes after the complete combustion of organic materials. The samples were then characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and X-ray diffraction (XRD). Ultimately, the photocatalytic performance of the hybrids was evaluated from the degradation of methylene blue (MB), where they exhibited excellent photocatalytic activity. The proposed mechanism for the enhanced photocatalytic efficiency of the samples is explained at the end of the paper. In principle, the approach to the fabrication of TiO2 tubes is demonstrated to be an effective and robust strategy to fabricate long and uniform metal-oxide micro-nano tubes on a large scale.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2021
·Vol. 73
·期 12
·4103-4111
·
IF 2.474
Wang Ying,Hou Jiyue,Li Xue,Hu Xiuqiong,Wang Yanjie,Yang Zhengwu,Ai Rui,Zhang Yiyong
This paper proposes the preparation of a S-Se-Ti 3 C 2 T x /TiO 2 cathode by etching Ti 3 AlC 2 with hydrofluoric acid and doping with selenium (Se). Through an electrochemical performance test, selenium is doped into the active material sulfur and forms a sulfur-selenium compound to compensate for the ‘chemical inertness’ of the elemental sulfur, thereby increasing the utilization rate of the active material. Taking advantage of the ability of TiO 2 to absorb polysulfide compounds and the high conductivity of carbides, the Ti 3 C 2 T x composite material, modified with TiO 2 nanodots, is constructed in situ as a sulfur-selenium composite material carrier, achieving a high sulfur content of 80%. S-Se-Ti 3 C 2 Tx/TiO 2 is used as the cathode, and the initial discharge specific capacity is as high as 1073 mAh g −1 , which improves the utilization of active materials and effectively inhibits the shuttle effect of lithium polysulfide intermediates.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Tongle Gao,Ting-Ting Li,Xilin Liao,Jia-Horng Lin,Bing-Chiuan Shiu,Ching-Wen Lou
Photoelectrodes constructed with photoactive materials are of great significance for the performance of photoelectrochemical (PEC) sensors. In this study, a facile and efficacious non-enzymatic glucose sensor based on the Cu 2 O/TiO 2 heterojunction was successfully constructed for quantitative determination of glucose concentration. The Cu 2 O/TiO 2 heterojunction was generated by first obtaining TiO 2 nanofibers via electrostatic spinning and high-temperature calcination, and then synthesizing Cu 2 O nanoparticles via a one-step hydrothermal reaction. By introducing the narrow band gap semiconductor Cu 2 O, the defect that pure TiO 2 could not absorb visible light was improved, resulting in the improved photoelectrochemical performance of the composite material compared to the single component semiconductor. The sensor exhibited favorable PEC non-enzymatic glucose sensing performance under simulated sunlight irradiation with a wide linear response range from 1 mM to 14 mM (R 2 = 0.9991) and a low detection limit of 14.4 μM (S/N = 3), along with good selectivity, stability and reproducibility. This also provided more ideas and possibilities for preparing photoelectrode materials by constructing heterojunctions.
研究领域:
材料科学
·
分析化学
·
生物传感
✓ 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）