MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-8
·
IF 5.705
Lin Haizhu,Chen Hemei,Shao Xi,Deng Chunhui
A zirconium(IV)-based metal organic framework (Zr-MOF) was deposited on polydopamine-coated silica microspheres to form microspheres of type SiO 2 @PDA@Zr-MOF. These were packed into capillary columns for enrichment of phosphopeptides. The column was off-line coupled to both matrix-assisted laser desorption/ionization time of flight mass spectrometry and LC-ESI-MS/MS. The method has a detection limit as low as 4 fmol of β-casein digest and a selectivity as high as 1:1000 (molar ratio of β-casein and BSA digest). It was applied to the analysis of human saliva. In total, 240 endogenous phosphopeptides were identified in only 25 μL human saliva.
A zirconium-based metal organic framework (Zr-MOF) was modified outside of polydopamine-coated silica microspheres to form microspheres named SiO 2 @PDA@Zr-MOF. Then they were packed in capillary columns for selective enrichment of phosphopeptides via interaction between Zr-O clusters and phosphate groups. The pre-concentration resulted in a better detection of phosphopeptides by mass spectrometry. Tris: Tris(hydroxymethyl)aminomethane; DMF: Dimethyl Formamide; Zr-MOF: Zirconium(IV)-organic framework; MOAC: Metal oxide affinity chromatography.
研究领域:
分析化学
·
生物医学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiawen Wu,Wentao Xu,Tianwen Dong,Ming Jin,Youfu Zhou
Incorporating graphene sheets into the ceramic matrix can induce a fine microstructure with unique interfaces, in which the excellent mechanical and electrical properties of individual sheets are packed and applied in bulk quantities. However, further development of graphene-ceramic composites is hindered by the poor distribution uniformity and structural integrity of 2D sheets as well as high anisotropy. Here, a self-assembly strategy based on electrostatic adsorption is proposed for the homogeneous and nondestructive fabrication of graphene oxide-ZrO 2 hybrids. By SPS , dense composites are obtained with improved flexural strength (1187 ± 21 MPa), fracture toughness (8.10 ± 0.04 MPa⋅m 1/2 ) and a percolation threshold below 1 wt%. The common anisotropy in graphene composites is restricted, showing consistent properties on different surfaces. A high correlation between resistance change and deformation has been confirmed, which can be well described by binomial equation. The sensitive and stable sensing performance makes this composite a promising smart material for in-situ self-monitoring.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2016
·
IF 2.048
Xingzhong Guo,Zichen Wang,Jie Song,Hui Yang
Monolithic macroporous barium zirconate derived from ionic precursors has been successfully prepared via a phase separation route in the presence of poly(ethylene oxide) (PEO) and propyleneoxide (PO). Poly(ethylene oxide) (PEO) acts as a phase separation inducer, while propyleneoxide (PO) acts as a gelation accelerant in the sol–gel process. Appropriate choice of poly(ethylene oxide) (PEO) and propyleneoxide (PO) allows the production of continuous macroporous monolithic gel with a porosity of ca. 63% and a macropore size of 1.8 µm. Some BaCl 2 recrystallizes in the dried gel, and subsequently tetragonal ZrO 2 phase precipitates after heat-treated at 800 °C. The crystalline phase barium zirconate forms after heat treatment at 1100 °C in air, while the macroporous structure is preserved with a slight increase of porosity and a decrease of macropore size.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
VACUUM
·
2023
·
IF 4
Haotian Cai,Kamale Tuokedaerhan,Zhenchuan Lu,Renjia Zhang,Hongguo Du
With the development of thin-film optoelectronic components and the increasing requirements for improved integration and performance of ultra-large-scale integrated circuits for devices, finding new high-k gate dielectrics to replace ZrO 2 has become a challenge. Elemental doping is an effective method to further improve the dielectric properties of ZrO 2 . In this work, a novel gate dielectric material was prepared by doping ZrO 2 with the rare-earth element La. The results show that the new gate media material has better performance; these include suppressing the crystallization of ZrO 2 as well as obtaining a large band gap (∼5.74 eV), a large conduction band shift ΔE C (∼2.96 eV), and a low leakage current (∼6.3 × 10 −6 A/cm 2 ). In addition, La doping can significantly suppress the generation of thin-film oxygen vacancies and low-k layers. Furthermore, the leakage current transfer mechanism of the device is systematically investigated. This study provides new insights for selecting a suitable La doping content for the modification of future gate dielectric materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF DENTISTRY
·
2020
·
IF 3.242
Jiaxue Yang,Jiadi Shen,Xinyi Wu,Feng He,Haifeng Xie,Chen Chen
Objectives This study investigated the effects of the surface conditioning of nano-zirconia fillers with 10-methacryloyloxydecyl dihydrogen phosphate (MDP) and dipentaerythritol penta-acrylate phosphate (PENTA) on the degree of conversion and mechanical properties of Bis-GMA- and UDMA-based resin composites containing the fillers. Methods MDP or PENTA conditioned nano-zirconia fillers were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The conditioned nano-zirconia fillers were then used to prepare Bis-GMA- and UDMA-based resin composites. The bending strength and elastic modulus of the prepared composites were evaluated, and Weibull analysis was adopted to evaluate the reliability of the bending tests. Degree of conversion (DC) was measured by FTIR. Results FTIR and XPS analysis confirmed formation of Zr O P bonds in the MDP-conditioned and PENTA-conditioned zirconia fillers. MDP-conditioning and PENTA-conditioning increased bending strength of Bis-GMA-based composites (100.70 ± 7.15 MPa, 98.65 ± 4.76 Mpa) and UDMA-based composites (99.02 ± 4.45 MPa, 99.92 ± 5.78 MPa) compared to the groups with untreated nano-zirconia fillers (Bis-GMA-based, 84.98 ± 5.13 MPa; UDMA-based, 88.24 ± 4.61 MPa). The same trend was observed for the Weibull modulus ( m ) and elastic modulus. The MDP/PENTA conditioning did not affect the DC of the composites. Conclusion MDP or PENTA conditioning of nano-zirconia fillers improved the mechanical properties of the composite compared to the composites containing untreated nano-zirconia fillers; however, it did not affect DC. Clinical significance Mixing MDP- or PENTA-conditioned nano-zirconia fillers directly with gamma-MPS-conditioned silica to the resin composite has the potential to improve the composite’s mechanical properties.
研究领域:
牙科材料学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lin-Lin Zhu,Xin Xu,Min-Min Dai,Yu-Jian Jian,Guang-Xiang Zhang,Cheng-Cai Zhao,Hua-Tay Lin
Thulium oxide (Tm 2 O 3 ) transparent ceramics with outstanding optical transparency were successfully prepared with various contents (0–4 at%) of zirconia (ZrO 2 ) added as sintering additive using pressureless vacuum sintering at 1850 °C for 8 h. The effect of ZrO 2 content on the changes of microstructure, transparency, Vickers hardness , fracture toughness, and thermal conductivity of Tm 2 O 3 transparent ceramics were systematically investigated in this research. The experimental measurements showed that the in-line transmittance of 3 at% ZrO 2 -doped Tm 2 O 3 transparent ceramics with the grain size of 6.7 μm was 76.3% at the wavelength of 880 nm and approximately 85% in the range of 2100–2500 nm. In addition, the Vickers hardness and fracture toughness were significantly improved from 7.8 ± 0.4 to 10.2 ± 0.2 GPa and 0.97 ± 0.06 to 1.32 ± 0.10 MPa m 1/2 , respectively, with content of ZrO 2 increasing from 0 to 4 at%, while on the contrary the thermal performance was observed to decrease. This study showed that the in-line transmittance of Tm 2 O 3 ceramics with favorably combined optical and mechanical properties could be achieved by the proper tailoring of ZrO 2 content.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·Vol. 110
·期 2
·280-290
·
IF 2.3
Chen Liqiang,Tian Shuangshuang,Zhang Jinghua,Zhang Hong,Sheng Liangquan,Wang Xinxin,Fan Jiajing,Huang Deqian
A novel electrochemical sensor utilizing ZrO 2 and ZnO hybrid nanocomposites was developed for the specific detection of dopamine (DA) with ultra-high sensitivity and selectivity. The structure and electrochemical properties of the composites were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), a gas adsorption apparatus (BET), and electrochemical analysis. The results indicate that in the ZrO 2 /ZnO nanocomposite, ZrO 2 exhibits a large specific surface area and abundant active sites, which can accelerate the oxidation-reduction reaction of DA. Meanwhile, ZnO nanomaterials demonstrate high electronic conductivity, enhancing the sensor’s adsorption capability for DA. The electrochemical sensor has a detection limit of 94.1 nM within the linear range of 0.5–100 μM. Assays were conducted using human serum samples at physiological pH. The recovery rate was 98.5–101.0%, and the relative standard deviations were less than 5%. This suggests that the electrochemical sensor holds promise for bioanalysis and disease monitoring. Graphical Abstract
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Jian He,Xiao Lei Li,Hui Ming Ji,Qing Pu Wang
ZrO2 wet gel was prepared using zirconium n-butoxide as precursor and 1,2-propylene oxide (PO) as a gelation agent in sol-gel process. Then, tetraethoxysilane (TEOS) was used to strengthen the wet gel in aging process. Finally, the monolithic silica/zirconia aerogel was obtained by supercritical fluid drying. N2 adsorption-desorption method, scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) were used to characterize microstructure of the aerogel. The influence of pH of the aging solution on microstructure of silica/zirconia aerogel was studied. The results indicate that the particle size distribution of SiO2/ZrO2 aerogel was more uniform and less aggregate when aging in acid solution. However, the average pore diameter and particle size of SiO2/ZrO2 aerogel was increased by aging in alkaline solution. Aging in alkaline condition was useful for largening the pore size of SiO2/ZrO2 aerogel, and the maximum specific surface area and pore volume were obtained at pH=9. Meanwhile, different reactions were produced between the acid/alkaline solution and the hydroxyl of SiO2/ZrO2 aerogel, and the ester group/amino group was obtained relatively which can modify the network of aerogel and decrease the shrinkage of aerogel during the supercritical fluid drying.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 15
·7395-7404
·
IF 11.301
Qiuyan Duan,Chenghua Zhang,Song Sun,Yang Pan,Xiong Zhou,Yang Liu,Kun Chen,Cunshuo Li,Xianzhou Wang,Wenzhi Li
Lean methane combustion through efficient catalysis is an intensely important way to reduce environmental pollution. Notably, palladium-based catalysts are promising catalytic materials. The small size of palladium particles is a crucial factor to improve the catalytic activity. In this study, we proposed a new pathway to minimize the size of palladium particles for palladium-based catalysts from the perspective of material preparation. We first built double spatial barriers on the interface between the support and the active species to prepare atomically dispersed palladium species catalysts. To be specific, organo-silane was employed as a surfactant to modify the zirconia support and palladium acetate was selected as the palladium precursor, taking advantage of the spatial structure of alkane chains combined with silicon atoms and palladium acetate in toluene. Under a lean methane reaction environment, 0.23 wt% atomically dispersed palladium species deposited on decorated zirconia (donated as 0.23 wt% Pd/SiO2–ZrO2) displayed high catalytic activity with 100% conversion at a temperature of around 400 °C with gas hourly space velocity (GHSV) of 30 000 ml g−1 h−1, higher than that of pristine zirconia loaded with 0.23 wt% palladium nanoparticles (donated as 0.23 wt% Pd/ZrO2), which removed all lean methane at around 600 °C under the same conditions. As the palladium loading increased on the modified support, the 1.38 wt% Pd/SiO2–ZrO2 catalyst had a comparable catalytic activity and fully converted lean methane at around 330 °C. The lean methane combustion reaction pathway for the 0.23 wt% Pd/SiO2–ZrO2 catalyst was investigated by in situ NAP-XPS and in situ DRIFTS. Hydroxyl groups formed during the reaction were transferred to the silica, which could reduce the formation of the inactive Pd(OH)x species and expose more active sites to improve the catalytic activity. It is hoped that this study will provide a novel method to improve the utilization of palladium species in practical applications.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 23
·6914-6923
·
IF 6.641
Yi-Xuan Liu,Hao-Cheng Thong,Chunlin Zhao,Qing Liu,Xingyu Xu,Ke Wang,Jing-Feng Li
The understanding of certain basic issues in (K,Na)NbO3 (KNN)-based systems is still missing, one of which being the influence of ZrO2 addition on the behaviors of KNN-based solid solutions at trace levels possibly introduced during the process of material preparation. Herein, KNN solid solutions with trace ZrO2 addition (0, 0.01, 0.05, and 0.1 mol%) were prepared by a normal sintering method. The dielectric permittivity and the piezoelectric coefficient d33 reach the maximum (εr = 497 and d33 = 139 pC N−1) with 0.1 mol% ZrO2 addition. Moreover, the microscopic results supported by PFM are in agreement with those from the macroscopic perspective. To establish the relationship among the ZrO2 addition contents, the induced defects and the properties of the solid solutions, a related defect model is proposed to support the experimental observation and the origin of induced defects is discussed. The results demonstrate that the properties of the KNN solid solutions can be closely affected by trace zirconia addition.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Kangkang Yuan,Xiaotong Jin,Zhichao Yu,Xinzhu Gan,Xinqiang Wang,Guanghui Zhang,Luyi Zhu,Dong Xu
Mesoporous zirconia has been widely used as supporting materials, absorption materials, catalysts and high temperature insulating materials. While seldom has taken a consideration of the mesoporous fiber structure. In the present work, mesoporous zirconia ceramic fibers were fabricated by electrospinning method with CTAB as the template. The thermal decomposition and crystallization process of the mesoporous zirconia fibers were fully studied by TG/DSC, IR spectra and XRD . The highest surface area of the mesoporous zirconia fibers was about 120 m 2 /g. With mesoporous zirconia fibers as the supporting materials, tungstate supported on zirconia fibers catalyst showed that the specific activity of bromination of phenol red was 1.26 mmol h −1 g −1 . The results confirmed that zirconia fibers with the mesoporous structure would be a promising candidate as a supporting material.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2022
·Vol. 14
·期 1
·1-10
·
IF 1.067
Wei Zhili,Wei Li
Zirconia ceramics (ZiC) has become a biomaterial with good clinical application prospects due to its good biocompatibility, stability, and excellent mechanical properties. In this study, bioactive glass (BioS) was undertaken as the modifier, and the ZiC precursor solution was penetrated
on the surface of the ZiC body or the ZiC particles were coated with the BioS precursor solution, so as to obtain the ZiC with biological activity by introducing the BioS phase. While the material was characterized, its mechanical properties and biological activity were analyzed by simulating
the mineralization of the body fluid, including the cell adhesion, proliferation, and differentiation of the material. The ZiC was applied as an implant for restoration of patients with teeth loss caused by periodontal disease. In the test, after surface infiltration of BioS sol or coating
of ZiC particles, a very thin BioS phase can be formed on the surface of ZiC after high temperature sintering. The in vitro mineralization test showed that the activation of the grain boundary promoted the deposition of calcium and phosphorus layers on the surface of the sample. The
mechanical test revealed that the relative density, flexural strength, and fracture toughness of the material decreased with the infiltration and coating of BioS. However, under proper preparation conditions, the modified ZiC still showed good mechanical properties and can promote the spreading,
adhesion, and differentiation of mouse bone marrow mesenchymal stem cells (mBMSCs). Clinical trials proved that after the modified ZiC implant material was implanted in patients with teeth loss, the structure was not loose or broken, and the intraoral prosthesis could function normally. After
treatment, the level of IL-1β in the gingival crevicular fluid of the patient decreased obviously (P <0.05). In addition, the probing depth (PD), clinical attachment loss (CAL), and other indicators decreased greatly (P <0.05).
研究领域:
材料科学
·
口腔医学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）