JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Guandong Liang,Jianqiang Bi,Linjing Qiao,Shaoyin Wang,Yao Yang,Zhuangzhuang Yin
In view of the lack of a conformal, load-bearing, lightweight, and high-temperature resistant integrated microwave-absorbing composites for applications under extremely complex conditions, this study successfully applies gel casting craft to porous Si 3 N 4 microwave-absorbing composites. The high-temperature decomposition reaction of Ti 3 SiC 2 powder was utilized to generate uniform Ti-C x -N 1−x grains in situ and to enhance the mechanical and microwave-absorption properties of porous Ti-C x -N 1−x /Si 3 N 4 composites. The bending strength , fracture toughness, density, maximum reflection loss value, absorption bandwidth and matched thickness in P-band of the composite with 30 wt% Ti 3 SiC 2 addition were 164.87 ± 7.56 MPa, 2.61 ± 0.13 MPa·m 1/2 , 2.077 g/cm 3 , 32.42 dB, 1.74 GHz and 4.2 mm, respectively. The fracture toughness and bending strength of the composite were increased by 71.71% and 58.13%, respectively, compared with monolithic porous Si 3 N 4 . The electromagnetic wave loss mechanisms of the composites are proposed as a combination of conductivity loss, multiple reflections and scattering, interfacial polarization and defect polarization.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Zhao-wang DONG,Xue-yi GUO,Yang XIA,Pei-dong LIU,Jin-xi QIAO,Zhong-chen LI,Han-ning LIU
Silicon in two types of upgraded titania slag (UGS) containing different components was removed using a low-temperature alkali solution and melt leaching. The effects of temperature, time, and NaOH solution concentration on desilication rate were investigated. Desilication in melt can lead to the loss of titanium in upgraded titania slag. After agitating at a speed of 600 r/min and 80 °C for 300 min, the silicon content in domestic slag decreased from 0.96 wt.% to 0.29 wt.%, and the leaching rate was 69.8% after leaching in 4 mol/L sodium hydroxide solution. Under the same conditions, the silicon content in imported slag decreased from 1.11 wt.% to 0.12 wt.%, and the desilication rate was up to 89.2%. The alloy powders obtained from the reduction of upgraded titania slag with magnesium were sintered to produce titanium alloy, and the alloy was characterized. It was determined that the Ti 5 Si 3 phase in the titanium alloy product was successfully eliminated. In addition, the two UGS materials and the chemical principle of desiliconization were analyzed using a thermodynamic software.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chaorui Xue,Ruizhi Xue,Ruirui Huang,Xiangqian Fan,Huinian Zhang,Wenjing Zheng,Ying Li,Ning Li,Qing Chang,Shengliang Hu
Interfacial solar driven water evaporation (ISDWE) technology has been widely studied to desalinate seawater in aiming to alleviate the scarcity of clean water. In this paper, the ISDWE performance of Ti mesh was enhanced by anodized TiO 2 nanotube film and applied voltage, and the water evaporation rate increased from 1.20 kg•m −2 •h −1 to 2.48 kg•m −2 •h −1 . Due to hydrophilic and nanoporous nature of TiO 2 nanotube film, the solar absorptivity, wettability of Ti mesh was improved, the water evaporation enthalpy was reduced, and the water evaporation rate reached 1.98 kg•m −2 •h −1 . For the superior ISDWE performance with applied voltage, electrothermal effect and internal electrical filed were proved to be contributing factors. The solar irradiation can enhance the electrothermal effect for the semiconducting nature of TiO 2 . The internal electrical field can optimize the solar absorptivity and water evaporation enthalpy through doping TiO 2 and breaking water clusters. Moreover, the applied voltage also increased the salt-resistance property of Ti mesh coated with TiO 2 nanotube film. When increasing NaCl concentration, stable water evaporation rate was attainable under 1.2 V, whereas continuous deceleration of water evaporation occurred without external voltage. Therefore, our study provides strategies for achieving high efficient and salt-free seawater desalination by ISDWE technology.
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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
·
2019
·Vol. 107
·期 10
·2310-2326
·
IF 3.221
Bailong Tao,Maowen Chen,Chuanchuan Lin,Lu Lu,Zhang Yuan,Ju Liu,Qiang Liao,Zengzilu Xia,Zhihong Peng,Kaiyong Cai
The poor osseointegration and postoperative bacterial infection are prominently responsible for the failure of titanium (Ti)-based implant in clinic. To address above issues, methacryloyl modified graphene oxide (GOMA) as zinc ions (Zn 2+ ) reservoir and release platform was fabricated on the Ti substrates with cathode electrophoresis deposition (EPD). Afterward, phenylboronic acid (PBA) functionalization methacryloyl-gelatin (GelMA-PBA) was reacting with GOMA through in situ free-radical polymerization to prepare GO-Zn/GelMA-PBA coating. The obtained coating was confirmed by scanning electron microscopy, X-ray photoelectron spectroscopy, and Zn ions release property, respectively. in vitro cellular experiments including cell activity, alkaline phosphatase, collagen secretion, extracellular matrix (ECM) mineralization, osteogenic genes and proteins, revealed that GO-Zn/GelMA-PBA coating was beneficial for enhancing the adhesion, proliferation, and differentiation of osteoblasts. The positive results were related to the existence of gelatin, formation of boronic ester between PBA groups, and carbohydrates of osteoblasts surface. Meanwhile, antibacterial assay against Staphylococcus aureus and Pseudomonas aeruginosa confirmed that GO-Zn/GelMA-PBA coating on Ti substrates had superior antibacterial capacity, availably inhibited the bacterial adhesion, and prevented formation of biofilm. Hence, the study provides a promising strategy for designing pro-osteogenesis and antibacterial coating on Ti substrates for orthopedic applications.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-10
·
IF 5.479
Zhang Kaina,Hu Dehua,Deng Suimin,Han Meng,Wang Xiangfeng,Liu Hailing,Liu Yuan,Xie Mengxia
A novel magnetic nanomaterial for use in metal ion based affinity chromatography is described. It is based on the chelation between the phosphate groups of phytic acid (PA) and Ti(IV) ions. Due to the large number (6) of phosphate groups of PA, it has a large capacity for Ti(IV) ions. PA was first immobilized on magnetite nanoparticles (PA-MNPs) and then loaded with Ti(IV) ions to obtain the sorbent (Ti-PA-MNPs). The fraction of Ti(IV) ions on the surface of PA-MNPs that is exposed to the solution binds the phosphate groups of phosphopeptides. The bound phosphopeptides can then be magnetically separated. The method was applied to the enrichment of the phosphopeptides in a β-casein tryptic digest. A tryptic digest of bovine serum albumin (BSA) was added at a molar ratio (β-casein to BSA) of 1:2000 to study selectivity. The phosphopeptides were quantified by mass spectrometry. The limit of detection can be as low as 8 × 10 −10 mol L −1 . This sorbent has a high absorption capacity (53.5 μg mg -1 ) and shows good recoveries (90%). As many as 2145 phosphopeptides were isolated from 500 μg tryptic digest of a rat liver lysate after enrichment by Ti-PA-MNPs. This is superior to that (1568 phosphopeptides) of commercial TiO 2 kit.
Schematic presentation of fabrication for a novel modified magnetic nanomaterial (Ti-PA-MNPs) based on the chelation of phytic acid (PA) with Ti(IV) ions. Ti-PA-MNPs were successfully applied to enriching low abundance phosphopeptides from biosamples in mass spectrometric analysis.
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Yun Yang,Tianjun Zhang,Dan Zhou,Xinchao Liu,Shuijin Yang,Xinhuan Lu,Qinghua Xia
Recently, a Ti-containing hollownest-structured zeolite (Ti-HSZ) material with the shell constructed by randomly intergrown MWW (framework type code) flaky crystals has been synthesized through one-step rotating hydrothermal method within 3.5 days, which shows predominant catalytic property for the epoxidation of alkenes . Herein, it is firstly reported that the crystallization efficiency of Ti-HSZ material can be notably increased by applying seeds-assisted synthesis method. Thus-crystallized materials have been characterized by XRD , UV–vis, XPS , SEM , TEM, FT-IR, and N 2 adsorption-desorption. Moreover, the key controlling factors are revealed to include the addition percentage of seed crystals, rotating rate and filling degree of autoclave. When 2 wt% or 3 wt% seed crystals are added into the reaction gel, the crystallization time of Ti-HSZ can be sharply reduced to 2.5 days or even 2.0 days, respectively. Particularly, thus-synthesized Ti-HSZ-SM material still maintains hollownest morphology characteristic and excellent catalytic activity and catalytic stability. About 95% allyl chloride can be converted into corresponding epoxide when using H 2 O 2 as oxidant, and about 85% cyclopentene and 87% cyclooctene can be converted into corresponding epoxides when using TBHP as oxidant, with the selectivity for epoxides of nearly 100%.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 4
·E69
·
IF 3.12
Li Xu,Ye Wang,Qiutong Xu,Huiying Duan
Ti/SnO2-Sb-Fe electrodes have been prepared by a novel precipitation printing method, the traditional sol-gel method, and the direct current deposition method. The microstructure of the electrodes was systematically characterized through X-ray diffraction (XRD) observation and high-resolution transmission electron microscopy (HRTEM) verification. In addition, the morphology was characterized by scanning electron microscopy (SEM), while the electrochemical properties and the stability were further investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and accelerated life testing. The results indicate that the Ti/SnO2-Sb-Fe electrode prepared by precipitation printing has the smallest nanoparticle structure (< 10 nm), a higher electrochemical porosity (49.6%), and a higher oxygen evolution potential (2.20 V). As a comparison, the Ti/SnO2-Sb-Fe electrode prepared by the sol-gel method has the longest service life. To further evaluate the electrocatalytic activity of the Ti/SnO2-Sb-Fe electrodes, Acid Red 73 was employed as simulated sewage for electrochemical degradation. After 180 min, the removal efficiency of AR 73 reached 86.8%, 63.4%, and 74%, respectively, for Ti/SnO2-Sb-Fe electrodes prepared by precipitation printing method, traditional sol-gel method, and direct current deposition method. Furthermore, the degradation of AR 73 followed pseudo-first-order kinetics.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Xiaomeng Dou,Weiming Hao,Xiangqing Li,Lixia Qin,Shi-Zhao Kang
In the present work, Ti mesh loaded with Ag “nanobosk” was prepared through electro-deposition and characterized with X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Then, the surface enhanced Raman scattering of norfloxacin on the Ti mesh loaded with Ag “nanobosk” was directly explored in norfloxacin aqueous solution. In addition, for practical purposes, the surface enhanced Raman scattering of norfloxacin was studied as a function of content of Ag, pH of solution, ions in water, and salinity, respectively. At last, the surface enhanced mechanisms were discussed preliminarily. The results indicate that the Ti mesh loaded with Ag “nanobosk” is an ultrasensitive surface enhanced Raman scattering substrate for trace norfloxacin in water. When the concentration of norfloxacin is 1 × 10 −5 mol L −1 , the enhancement factor is approximately 5.1 × 10 3 at 1389 cm −1 . And the detection limit is up to 1 × 10 -10 mol L −1 for norfloxacin under optimal conditions. Our work provides a new strategy for designing a sensing platform which is sensitive to trace norfloxacin in water and can be applied in the routine detection.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yongxiang Chen,Yunjiao Li,Wei Li,Guolin Cao,Shuyun Tang,Qianye Su,Shiyi Deng,Jia Guo
The stabilities of the host and interfacial structure for layered LiNi x Co y Mn 1-x-y O 2 cathode materials are critical for their electrochemical properties, especially at high voltage. This study reports the synergetic effect of the Zr and Ti elements on the LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode material (NCM523). The as-obtained Zr/Ti modified LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode material shows the excellent electrochemical performance at high voltage. It delivers 167.3 mAh·g −1 at 1 C over 3.0–4.4 V corresponding 94.20% capacity retention after 200 cycles. Moreover, the rate capability of Zr/Ti co-modified NCM523 at 16 C (3.0–4.4 V) rises to 139.4 mAh·g −1 and corresponding capacity retention (vs. 0.5 C) is 79.57%. In addition, its capacity retention reaches to 91.71% after 100 cycles at 1 C rate even at 3.0–4.6 V. Such superior electrochemical performances are ascribed to the Zr doping and Ti modification. The synergetic modifications of the Zr/Ti elements not only stabilize the crystal structure, but also absorb the lithium residues to form mixed Li 4 Ti 5 O 12 /Li 2 TiO 3 coating layers, which strengthen the stability of the interfacial structure and the kinetic characteristics of the cathode materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yichao Gong,Zhong Chen,Mao Yang,Hailiang Wang,Chen Dang,Wanxia Huang,Tiecheng Lu
Li 4 SiO 4 has been widely studied as attractive tritium breeding materials due to its innate merits. Considering the potential advantages of nanostructure in tritium breeding materials, a distinctive process was developed to obtain nanostructured Li 4 SiO 4 pebbles. In brief, ultrafine precursor powders were synthesized by solvothermal method without using surfactants , and then indirect wet method was adopted to generate the green spheres with homogeneous microstructure. After that, the suitable sintering conditions were defined by studying the effects of sintering parameters on the grain size evolution, and nanostructured Ti-doped Li 4 SiO 4 pebbles were first obtained by two-step sintering method. This study will be expected to provide references for fabricating other Li-based tritium breeding materials.
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Nano Research
·
2018
·Vol. 11
·期 9
·4587-4598
·
IF 7.994
Zhang Jingtong,Chen Yalan,Liu Ming,Du Kun,Zhou Yan,Li Yanpeng,Wang Zhaojie,Zhang Jun
Few-layered MoSe 2 nanosheets with mixed 1T/2H phase were successfully arrayed on a Ti substrate (forming 1T@2H-MoSe 2 /Ti) through a facile one-step solvothermal process. After testing different synthesis conditions, it was found that the optimal process involves a temperature of 200 °C and a reaction time of 12 h. Structural characterizations reveal that the morphology of 1T@2H-MoSe 2 consists of edge-terminated nanosheets with one to five layers, composed of a mixed 1T/2H phase dominated by the 1T one. The 1T@2H-MoSe 2 /Ti electrode shows excellent HER catalytic activity, with a small onset potential (−120 mV vs. reversible hydrogen electrode, RHE) and an electrode potential of only −133 mV (vs. RHE) to achieve a current density of 20 mA·cm −2 . This excellent electrocatalytic activity is due to the synergistic effects of 1T metallic phase, few-layered nanosheet morphology, and direct growth of 1T@2H-MoSe 2 on the Ti substrate. In addition, the 1T@2H-MoSe 2 /Ti electrode shows excellent stability towards long-term electrolysis. This is due to the long-term stability of the valence states of Mo and Se, as shown by post-electrolysis X-ray photoelectron spectroscopy analysis.
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高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Zhenzhen Zhou,Guanghui Liu,Jia Ni,Wanlu Liu,Qian Liu
A kind of novel compound Ba 1-x (Zr,Ti)Si 3 O 9 :xEu simultaneously activated by different-valence Eu 2+ and Eu 3+ ions has been successfully synthesized. The existence of Ti 4+ -O 2- charge transfer (CT) transitions in Ba 1-x ZrSi 3 O 9 :xEu is proved by the photoluminescence spectra and first principle calculations, and the Ti 4+ ions come from the impurities in commercial ZrO 2 raw materials. Under the excitation of multi-wavelength ultraviolet radiation (λ EX = 392, 260, 180 nm), Ba 1-x ZrSi 3 O 9 :xEu (x = 0.15) can directly emit nearly white light. The coexistence of multiple luminescent centers and the energy transfer among Zr 4+ -O 2- CT state, Ti 4+ -O 2- CT state, Eu 2+ and Eu 3+ ions play important roles in the white light emission. Ba 1-x ZrSi 3 O 9 :xEu (x = 0.15) has good thermal stability, in particular, the intensity of emission spectrum (λ EX = 392 nm) at 150 °C is ∼96% of that at room temperature. In general, the multi-wavelength ultraviolet-excited single-phase white light emitting phosphor Ba 1-x (Zr,Ti)Si 3 O 9 :xEu possesses a promise for applications in white light emitting diodes (WLEDs), agriculture, medicine and other photonic fields.
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