Nanoscale
·
2016
·Vol. 8
·期 38
·16963-16968
·
IF 7.76
Guoqiang Zhang,Wenshuai Jiang,Shixin Hua,Haifeng Zhao,Ligong Zhang,Zaicheng Sun
Defects (Ti3+ or oxygen vacancies) have been demonstrated to promote the charge separation process in TiO2 based photocatalysts. Particularly, the bulk defects within a certain concentration can give a great enhancement for both light absorption and charge separation efficiency. In this report, we explored a one-step molten salts route to synthesize SrTiO3 nanocubes with bulk defects (Ti3+ doped) by using SrCO3 as a Sr source, and TiO2 and Ti powder as Ti sources. The amount of defects can be tuned by changing the molar ratio of Ti/TiO2. The corresponding bandgap of SrTiO3 can be changed from 3.29 to 2.73 eV with the increase of defects. X-ray diffraction and electron microscopy disclose that SrTiO3 is highly crystalline and has a cubic morphology. X-ray photoelectron spectroscopy and electron paramagnetic resonance indicate that the as-prepared SrTiO3 is close to the Ti3+ doped SrTiO3. Surface photovoltage spectroscopy (SPS) and field-induced SPS confirm that Ti3+ doping in the SrTiO3 turns it from an n-type semiconductor to p-type. The SrTiO3 with an optimal amount of defects exhibits highly enhanced photocatalytic performance. An excess amount of defects results in a weak SPS response and photocatalytic performance.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-12
·
IF 2.8
Su Qi,Qu Jing-Jing,Liu Fei,Feng Ai-lin,Yuan Chang-Lai,Liu Xiao,Meng Liu-Fang,Ding Guo-An,Su Ming-wei,Chen Guo-Hua
A series of new systems of the SrCe 1- x Ti x O 3 and SrCe 1− x Zr x O 3 (SCT x and SCZ x , x = 0.0–0.1) ceramics have been prepared by the traditional solid-phase methods. The XRD patterns results show that an ABO 3 -type perovskite structure of the SrCeO 3 ceramic can be obtained as x = 0.0. With the increase in Ti 4+ - and Zr 4+ -ions-doping content of x = 0.02–0.1, the SCT x and SCZ x ceramics basically belong to the perovskite phase with the orthorhombic structure of the space group Pmcn (62), and the results of EDS analysis on the proportion of each element can also verify the correctness of the XRD analytical results. In addition, all the microstructures are dense for the SCT x and SCZ x ( x = 0.0–0.1) samples. The fitting results of complex plane impedance verified that the temperature stability of SCT x solid solution ceramics is more suitable for adjusting to the practical application range. Especially, the SCT x ( x = 0.03) ceramics sintered at 1270 °C for 4 h can obtain the relatively excellent dielectric properties of ε r = 50.16, Q × f = 8,940 GHz (at 5.91 GHz), and τ f = + 0.08 ppm/°C.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Dong-Dong Zhou,Hao Zhang,Qian Zhang,Zheng-Ming Qian,Wen-Jia Li,Chun-Hong Li,Feng-Qing Yang,Hua Chen
In this study, a titanium ion (Ti 4+ ) functionalized polydopamine coated ferroferric oxide (Fe 3 O 4 @PDA@Ti 4+ ) core-shell magnetic particle was prepared for the selective extraction of nucleotides. Firstly, different metal ions including Ti 4+ , Zr 4+ , Fe 3+ , Al 3+ , Cu 2+ , Zn 2+ , Ni 2+ and Mg 2+ were respectively immobilized onto Fe 3 O 4 @PDA particles and their extraction efficiency for five nucleotides [cytidine-5′-monophosphate (CMP), uridine-5′-monophosphate (UMP), guanosine-5′-monophosphate (GMP), thymidine-5′-monophosphate (TMP) and adenosine-5′-monophosphate (AMP)] were compared. Among these prepared materials, Fe 3 O 4 @PDA@Ti 4+ , which exhibited the highest extraction efficiency for nucleotides, was further characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. After being optimized of the extraction parameters including adsorbent amounts, extraction time, extraction temperature, type and concentration of the eluent, the prepared Fe 3 O 4 @PDA@Ti 4+ magnetic particles were successfully applied for the selective extraction and determination of CMP, UMP, GMP, TMP and AMP in Cordyceps and Lentinus edodes . Good linearity (varying from 0.063 to 19.000 μg/mL, R 2 > 0.999) and low limit of detection (LODs) (ranging between 0.0047 and 0.0141 μg/mL) for target analytes were achieved. These results demonstrated that the synthesized material in this study had potential for selective extraction of phosphorylated small molecular compounds in complicated matrix.
研究领域:
生物化学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Canhong Zhu,Jiani Wu,Xueting Jin,Yinghua Yan,Chuan-Fan Ding,Keqi Tang,Di Zhang
Chemical modification of biological materials is indispensable for enrichment of phosphorylated peptides. In this work, we synthesized a biomimetic honeycombed affinity chromatography (IMAC) adsorbent by preparing Crosslinked Chitosan, chelating aminomethyl phosphate decorated with Ti (IV) cation. The as-prepared CTSM@AMPA-Ti 4+ composites with stable structure, low steric hindrance, and high Ti 4+ loading amount were used as a promising adsorbent for enrichment of phosphopeptides. CTSM@AMPA-Ti 4+ showed extremely high sensitivity (0.4 fmol) and selectivity at a low composition molar ratio of β-casein/BSA (1:1000). What's more, it can keep its performance in the case that used to capture phosphorylated peptides from standard protein ten times or soaking in the acid/base solution for a long time. In addition, CTSM@AMPA-Ti 4+ successfully captured 35 phosphorylated peptides from human saliva. This study offers a way about diversiform functionalization of CTSM in phosphoproteome analysis and disease research.
研究领域:
生物化学
·
分析化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Junlei Qi,Minghe Cao,Yiying Chen,Hua Hao,Zhonghua Yao,Hanxing Liu
The effect of sintering atmosphere on the microstructure and dielectric properties of Sr 0.985 Ce 0.01 TiO 3 were investigated in this article. The sample sintered in nitrogen achieves a colossal permittivity (∼12655) and ultralow dielectric loss (0.006) at room temperature and 1k Hz. XRD results reveal that all the samples belong to P m 3 ¯ m space group and no secondary phase is detected. It can be verified by XPS measurement that the nitrogen sintered sample has the highest Ti 3+ content. Five dielectric relaxations can be observed in the dielectric spectroscopy in the test temperature range from −130–500 °C, which can be attributed to the existence of Ti 3+ ions, oxygen vacancies and the other associated defect clusters. Moreover, the off-center Ti 3+ ions make a certain contribution to the high permittivity. The ultralow dielectric loss at room temperature could be ascribed to the formation of defect clusters in the samples sintered in air and nitrogen. These defect clusters which associated with the oxygen vacancy, such as T i 3 + − V O .. − T i 3 + and V S r " − V O ¨ are able to localize charge carriers and restrain the motion and ionization of oxygen vacancies.
研究领域:
材料科学
·
物理学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liqi Zhang,Xu Zhang,Bowen Huang,Yusheng Yang,Zengwu Zhao
Titanium is an excellent structural and functional material . At present, the production of titanium has long process cycle, high energy consumption, serious pollution and other characteristics, so the development of low-cost titanium production methods has extremely far-reaching significance. In this work, the electrochemical reduction process of Ti(IV) and Ti(II) in the CaF 2 -CaO melt were investigated by cyclic voltammetry and square wave voltammetry measurements at 1740 K, respectively. In the CaF 2 -CaO-5 wt% TiO 2 melt, Ti(IV) ions were reduced to Ti by one step. One measure was taken to lower the valence state of Ti ions : Ti(IV) ions in the melt was changed to Ti(II) by adding Ti 0 . Ti(IV) ions were reduced in two steps: in the CaF 2 -CaO-5 wt% TiO 2 -Ti 0 melt, Ti(IV) → Ti(II) and Ti(II) → Ti, respectively, and in the CaF 2 -CaO-5 wt% TiO, the Ti(II) ions were reduced in a single step: Ti(II) → Ti. It was found that both migration and mass transfer affected the reduction processes. In contrast to the Ti(IV) reduction to Ti process, the Ti(II) reduction to Ti process showed a higher diffusion rate. Electrolytes and electrodes were analyzed after titanium electrodeposition by XRD . It was found that there were no metal titanium was detected in the electrolyte placed close to the cathode after electrodeposition . It believed that the formed metallic Ti reacted with dissolved O 2- in the melt to form TiO. The reduction process of Ti(IV) on the iron electrode was investigated, the metal Ti was reduced by alloying process, the oxidation of Ti was hindered, there was a dense structure layer of CaTiO 3 outside the reduced metal Ti that prevented the ions transfer and affected the Ti(IV) ions migration process, which might be the main factor that the Ti(IV) reduction process was controlled by migration. The lower valence state of Ti in the melt promoted the formation of Ca 2 TiO 4 , which increased the ion migration rate and decreased the mass transfer rate. It was suggested that titanium or titanium alloys may be prepared by reducing the valence of Ti(IV) in minerals and altering the melt composition. It is feasible to prepare titanium and titanium alloys by MOE short process using ore as raw material.
研究领域:
冶金学
·
材料科学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Xiao-Mei He,Xi Chen,Bi-Feng Yuan,Yu-Qi Feng
Grafting copolymerization, especially “grafting from” approach, has attracted a great attention for the preparation of cellulose-based materials with various functionalities. In this study, a novel phosphate group-containing cotton fiber-based material, CF-NH 2 -AZO-p(VPA-x), was successfully synthesized by a “grafting from” radical polymerization approach using vinyl phosphonic acid (VPA) as monomer. The phosphate group content of CF-NH 2 -AZO-p(VPA-x) could be easily regulated by adjusting the concentration of VPA monomer. Subsequently, titanium ions immobilized CF-NH 2 -AZO-p(VPA-x) (CF-NH 2 -AZO-p(VPA-x)-Ti 4+ ) was prepared and used as an immobilized metal affinity chromatography (IMAC) adsorbent for the selective enrichment of phosphopeptides from various biological samples. The relationship between enrichment efficiency and phosphate group content of CF-NH 2 -AZO-p(VPA-x)-Ti 4+ was investigated. The optimized CF-NH 2 -AZO-p(VPA-2)-Ti 4+ (x = 2) exhibited high selectivity and extraction capacity in phosphopeptides enrichment from standard peptides mixture, non-fat milk digests and protein-rich human serum. In addition, CF-NH 2 -AZO-p(VPA-2)-Ti 4+ was further applied for the specific capture of phosphopeptides from tryptic digests of rat brain lysate, and 3241 unique phosphopeptides were identified from 0.5 mg of rat brain by combining CF-NH 2 -AZO-p(VPA-2)-Ti 4+ pretreatment with liquid chromatography–tandem mass spectrometry (LC–MS/MS) analysis. We expect the proposed method can promote the development of “grafting from” approach in the preparation of cellulose-based adsorbents and broaden the application of cellulose-based adsorbents for biological analysis.
研究领域:
生物化学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Kang Du,Fei Wang,Xiao-Qiang Song,Yan-Bo Guo,Xiao-Chuan Wang,Wen-Zhong Lu,Wen Lei
The crystal structure and dielectric properties of Ti 4+ -substituted CaSnSiO 5 ceramic were investigated. Ti 4+ entirely substituted Sn 4+ of CaSnSiO 5 , and the solid solutions were formed at Ca(Sn 1- x Ti x )SiO 5 (0 ≤ x ≤ 1.0) ceramics. The evolutions of crystal structure were analysed through Rietveld refinement and transmission electron microscopy , and the phase transition from A 2/ a to P 2 1 / a space groups at Ca(Sn 1- x Ti x )SiO 5 (0.9 ≤ x ≤ 1.0) ceramics was clarified. The change in dielectric properties was related to the structural evolution of Ca(Sn 1- x Ti x )SiO 5 (0 ≤ x ≤ 1.0). The τ f values of Ca(Sn 1- x Ti x )SiO 5 (0 ≤ x ≤ 0.4) ceramics initially decreased to +49.8 ppm/°C and then increased to +98.3 ppm/°C because of Sn/TiO 6 octahedral distortion. The temperature coefficient of capacitance and ε r anomaly peak were controlled by Ti 4+ substitution for Sn 4+ at Ca(Sn 1- x Ti x )SiO 5 (0.4 ≤ x ≤ 1.0) ceramics. The results provided a way to control the τ f value of microwave dielectric ceramics .
研究领域:
材料科学
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陶瓷学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Guojun Lv,Yan Chen,Xuyang Zou,Jiangzhang Wang,Tao Wang,Fumin Wang,Xubin Zhang
Simultaneous insertion of double heteroatom in the MFI framework generally gives rise to synergistic catalysis effect, however the specific origins for synergistic catalysis is still nebulous. In this study, vanadium-titanium doped MFI zeolite was synthesized via one-pot hydrothermal synthesis with the addition of (NH 4 ) 2 CO 3 and applied as heterogeneous catalyst for the synergistic catalysis of 1-hexene and cyclohexene epoxidation. Simultaneous incorporation of vanadium and titanium induced the partial charge transformation of titanium (Ⅳ) into titanium (Ⅲ), which was verified by EPR and XPS characterizations. UV-Raman and UV–Vis spectra disclosed that partial charge transformation mainly occurred for framework titanium (Ⅳ). In addition, simultaneous insertion of vanadium and titanium gave rise to more Lewis acid sites as well as larger external surface area for VTS(0.15) zeolite in comparison to VS(0.15) and TS(0.15) zeolite. The prepared VTS(0.15) zeolite presented a TOF value of 118.8 h −1 for 1-hexene epoxidation, which is 7.8 folds and 1.3 folds of VS(0.15) and TS(0.15) respectively. Partial charge transformation of framework titanium (Ⅳ) into titanium (Ⅲ), robust Lewis acid sites as large external surface area may induce the synergistic catalysis effect for VTS(0.15) zeolite in the epoxidation reactions. Moreover, the obtained VTS(0.15) zeolite particles showed good reusability for more than five cycles.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 9
·1216-1225
·
IF 1.713
Wei Wang,Yue Hong-rui,Xue Xiang-xin
This study investigated the interdiffusion of calcium ferrite/calcium titanate system in the time range of 0–120 min by the diffusion couple method in a CO/N 2 reducing atmosphere at 700°C. The results show that after the diffusion reaction occurred, no longitudinal agglomerations were present on the substrate surface on the calcium titanate side. When the diffusion time was increased to 105 min, a net vacancy flow from calcium titanate to calcium ferrite might have occurred, causing the surface of the calcium ferrite substrate to collapse. The thickness of the diffusion layer of the calcium ferrite/calcium titanate system was about 17–48 µm, which conforms to the parabolic law of diffusion. The diffusion coefficient and the Ti 4+ concentration in the calcium ferrite/calcium titanate system are related. This shows an increase in the diffusion coefficient with the increase of Ti 4+ concentration, and the diffusion coefficient value was in the range of 10 −12 –10 −11 cm 2 ·s −1 .
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 76
·62235-62240
·
IF 3.84
Handong Jiao,Junxiang Wang,Long Zhang,Ke Zhang,Shuqiang Jiao
The electrochemical behavior of titanium ions at a liquid tin cathode has been investigated by cyclic voltammetry and square wave voltammetry in a NaCl–KCl melt at 1023 K. The results show that the deposition potentials of alkali metals and titanium at liquid tin are more positive than those at a solid tungsten cathode. Meanwhile, the results prove that titanium(III) ions can be reduced at liquid tin with a one-step reduction, Ti3+ + 3e = Ti, which is a quasi-reversible process with diffusion-controlled mass transfer. The diffusion coefficient of titanium(III) ions is 1.05 × 10−5 cm2 s−1. Additionally, galvanostatic electrolysis has been carried out to clarify the effect of the current density on the cathodic products. The result demonstrates that a greater depth of titanium will be diffused into the liquid tin cathode during electrolysis with a lower current density.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiuli Wang,Weiwei Fei,Zhifan Zhou,Mengjing Zhu,Yinghao Chang,Qilin Guo,Jia Guo,Changchun Wang
Magnetic-assisted DNA testing technology has attracted much attention in genetics, clinical diagnostics, environmental microbiology, and molecular biology. However, achieving satisfying DNA adsorption and desorption efficiency in real samples is still a big challenge. In this paper, a new kind of high-quality magnetic composite microsphere of MM@PGMA–PA-Ti4+ was designed and prepared for DNA extraction and detection based on the strong interaction of Ti4+ and phosphate groups. By taking the advantages of high magnetic susceptibility and high Ti4+ content, the MM@PGMA–PA-Ti4+ microspheres possessed remarkable extraction capacity for mimic biological samples (salmon sperm specimens) with saturated loadings up to 533.0 mg/g. When the DNA feeding amount was 100 μg and the MM@PGMA–PA-Ti4+ dosage was 1 mg, the adsorption and desorption efficiencies were 80 and 90%, respectively. The kinetic and equilibrium extraction data were found to fit well with the pseudo-second-order model and Freundlich isotherm model. Furthermore, the MM@PGMA–PA-Ti4+ microspheres were successfully employed for DNA extraction from mouse epithelial-like fibroblasts. The extraction ability (84 ± 4 μg/mg) and DNA purity were superior to the comparative commercial spin kits, as evaluated by electrophoresis assays and qPCR analysis. The experimental results suggest that the MM@PGMA–PA-Ti4+ microspheres possess great potential as an adsorbent for DNA purification from complex biological samples.
研究领域:
分子生物学
·
临床诊断学
·
环境微生物学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）