JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Zihua Lei,Wenjun Yu,Le Fu
Transparent or translucent ceramics typically exhibit inferior mechanical performance, which restricts their wider application. Here, we aim to develop ZrO 2 –SiO 2 –Al 2 O 3 ternary ceramic nanocomposites (TCNCs) that integrate those two often incompatible properties via microstructure engineering. A fixed ratio of 30 mol% SiO 2 was introduced into the ZrO 2 –Al 2 O 3 system, while the ratios between ZrO 2 and Al 2 O 3 were varied. Additionally, different forms of Al 2 O 3 (crystallization or amorphous) were used, resulting in four types of TCNCs. Among the samples studied, the TCNC containing 60 mol% ZrO 2 and 10 mol% amorphous Al 2 O 3 achieved high translucency and remarkable mechanical properties. The TCNC comprised ZrO 2 nanoparticles embedded in SiO 2 glass matrix and Al 2 O 3 glass domains. The superior properties of the TCNC can be attributed to its nanocrystalline-amorphous dual-phase microstructure. For TCNCs utilizing α-Al 2 O 3 submicron particles as the aluminum source, despite their adequate mechanical properties, the agglomeration and lack of densification of these particles resulted in significant light scattering, rending the TCNCs opaque. This study demonstrates that engineering a nanocrystalline-amorphous dual-phase microstructure is an effective strategy to achieve a synergistic combination of robust mechanical properties and high translucence.
研究领域:
材料科学
·
陶瓷研究
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 11
·115075
·
IF 1.449
Shaofeng Zhou,Haoran Liu,Shuzhan Wang,Lin Gan,Jin Huang,Guizhe Zhao,Yaqing Liu
Designing and fabricating novel nanomaterials with good dispersion as lubricant additives through green and simple method has remarkably potential for reducing the industrial energy consumption and engineering material loss. This study introduced a electrostatic self-assembly method to prepare graphene-load ZrO2 nanocomposites (ZrO2@GO), and their dispersion characteristics and tribological performance were investigated using as lubricant additives in paraffin oils. ZETA potential, FTIR spectra, Raman spectra, XPS and TEM characterization confirmed ZrO2 nanoparticles had been anchored on the surface of GO nanosheets. With the introducing of polar functional groups and loading function of GO, the as-prepared ZrO2@GO nanocomposites indicated good dispersion stability in paraffin oil. Thus, compared with pure paraffin oil, friction coefficient and wear rate of ZrO2@GO added paraffin oil were reduced by 20.7% and 21.5% respectively. Optical microscope photograph, 3D morphology and rough results further presented ZrO2@GO exhibited good friction reduction and wear resistance performance than single ZrO2 or GO in paraffin oil. The possible tribological mechanisms were described by a tribological model that the ZrO2@GO nanocomposites could play a synergistic role of bearing frictional load of ZrO2 nanoparticles and forming transfer film of GO on the worn surface.
研究领域:
材料科学
·
摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2015
·
IF 4.169
Qing Wang,Zhi-Yuan Luo,Mao Ye,Yu-Zhuo Wang,Li Xu,Zhi-guo Shi,Lanying Xu
The zirconia-coated silica (ZrO 2 /SiO 2 ) material was obtained by coupling layer-by-layer (LbL) self-assembly method and sol–gel technology, to take dual advantages of the suitable porous structure of SiO 2 and basic resistance of ZrO 2 . Adenosine 5′-monophosphate (5′-AMP) was then self-assembled onto ZrO 2 /SiO 2 via Lewis acid–base interaction, generating 5′-AMP-ZrO 2 /SiO 2 . The chromatographic properties of 5′-AMP-ZrO 2 /SiO 2 were systemically studied by evaluating the effect of acetonitrile content, pH and buffer concentration in the mobile phase. The results demonstrated that the 5′-AMP-ZrO 2 /SiO 2 possessed hydrophilic interaction chromatographic (HILIC) property comprising hydrophilic, hydrogen-bonding, electrostatic and ion-exchange interactions. For basic analytes, the column efficiency of ZrO 2 /SiO 2 and 5′-AMP-ZrO 2 /SiO 2 was superior to the bare ZrO 2 , and different selectivity was obtained after the introduction of 5′-AMP. For acidic analytes, good resolution was obtained on 5′-AMP-ZrO 2 /SiO 2 while the analysis failed on the bare ZrO 2 column owing to strong adsorption. Hence, the proposed 5′-AMP-ZrO 2 /SiO 2 had great potential in analyzing acidic compounds in HILIC mode. It was an extended application of ZrO 2 based SP.
研究领域:
分析化学
·
材料科学
·
色谱技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 12
·1837
·
IF 3.236
Haotian Cai,Kamale Tuokedaerhan,Zhenchuan Lu,Renjia Zhang,Hongguo Du
In this article, we report the preparation of Al-doped ZrO2(AZO) thin films by the sol–gel method. The electrical properties, microstructure, and optical properties of AZO high-k gate dielectric films at different annealing temperatures were systematically investigated. XRD results confirm that the AZO film was amorphous at a temperature of 600 °C, and Al doping raises the crystallization temperature of ZrO2. AFM and FESEM show a smooth surface of AZO film without cracks. As the annealing temperature increased from 600 to 900 °C, all of the films had similar RMS roughness under 1 nm, the film thickness decreased accordingly, the bandgap value increased from 5.77 to 5.82 eV, the valence band shift (ΔEv) increased, and the conduction band shift (ΔEc) decreased. XPS analysis showed that silicates were formed at the AZO/Si interfacial layer. Electrical performance tests showed that high-temperature annealing can effectively improve the electrical properties, as shown by the increase in dielectric constant (k) and the decrease in flat-band voltage (ΔVfb). However, an increase in leakage current density with increasing annealing temperature was observed due to the decrease inΔEcand the appearance of crystallization caused by the increase in annealing temperature.Keywords:high-k gate dielectrics;sol–gel;Al-doped ZrO2;thin films
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zonglong Gao,Zhuan Li,Guoyuan Wen,Jiaqi Wu,Ye Li,Hongying Nie,Mengting Wei
In braking materials field, MAX phase has been introduced into Cu-based composite materials to address issues such as inadequate wetting between ceramic particles and the metal matrix. This study focuses on preparing Ti 2 AlN-ZrO 2 -B 4 C reinforced Cu-based materials via the powder metallurgy method, and investigates the effects and mechanisms of different Ti 2 AlN/ZrO 2 ratios on the mechanical, thermal, and tribological properties of these materials. The addition of an appropriate amount of Ti 2 AlN (3 wt%) can enhance the densification and mechanical properties of Cu-based materials, as the diffusion of Al atoms promotes the sintering process. Similarly, the diffusion of Al also improves the thermal conductivity at grain boundaries, resulting in samples with higher Ti 2 AlN content exhibiting superior thermal diffusivity. When the Ti 2 AlN content reached 7 wt%, the material exhibited optimal hardness (43.35 ± 1.05 HBW), moderate shear strength (19.84 ± 1.86 MPa), as well as excellent high initial braking speed friction coefficient and stability. The reinforcement primarily arises from the diffusion bonding between Ti 2 AlN and Cu, leading to the formation of Cu-Ti compounds at the interface, which facilitates Ti 2 AlN in providing frictional force during the friction process and promotes the formation of a friction film due to the “pinning effect”. Additionally, the layered structure of Ti 2 AlN and the subsequent formation of amorphous Al 2 O 3 after oxidation contributed to the enhancement of friction stability.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Fei Fan,Shiyu Han,Ying Li,Lu Qi,Jie Kang,Zhiping Chen,Chang Tian,DeChao Wang,Wenwu Zhou
The microenvironments including the surface hydroxyls , the oxygen vacancies , and the d-band center of hierarchical TS-1 zeolite pickled by hydrochloric acid were regulated by ZrO 2 , the effect of ZrO 2 on the physicochemical properties and the catalytic performances of the corresponding NiMoS supported catalysts were studied. The experimental and theoretical calculation results show that the d-band center, the surface hydroxyl groups , and the oxygen vacancies were regulated after incorporation of ZrO 2 . Resulting in the modulated acidity of the support and the metal support interaction of the catalysts, further promoting the formation of type-II NiMoS active phases. The catalytic performance evaluations show that catalyst NiMo/1-ZAT exhibits the superior HDS performance, kinetic study further demonstrated that the enhanced catalytic activity was mainly contributed by the improved direct desulfurization activity generated from the moderate support acidity, suitable MSI, highest sulfidation degrees, most type-II NiMoS active phase and highest activity of individual active sites.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 19
·11856-11871
·
IF 3.945
Xinwei Sun,Jie Gu,Donglin Han,Truls Norby
The surface protonic conductivity of porous monoclinic ZrO2 sintered at temperatures in the range 700–1100 °C yielding relative densities of around 60% and grain sizes of approximately 160 nm has been studied using impedance spectroscopy as a function of temperature well below the sintering temperature in wet atmospheres (pH2O = 0.03 bar). The sum of two high-frequency impedance responses is argued to represent surface conductance according to a new model of impedance over curved surfaces. A simple brick layer model is applied to compare the measured macroscopic conductivities with predicted surface conductances. The well-faceted samples sintered at the highest temperatures exhibited activation enthalpies up to 58 kJ mol−1 of surface protonic conduction in wet atmospheres at temperatures above 300 °C. We attribute this to the mobility of dissociated protons over surface oxide ions, and the high preexponential is in good agreement with a model comprising relatively strong dissociative chemisorption. With decreasing sintering temperature, the particles appear more rounded, with less developed facets, and we obtain activation enthalpies of surface protonic conduction in the chemisorbed layer down to around 30 kJ mol−1, with correspondingly smaller preexponentials and an observed dependency. Supported by the thermogravimetry of adsorption, we attribute this to weaker and more molecular chemisorption on the more randomly terminated less faceted surfaces, providing water layers with fewer dissociated charge carrying protons, but also smaller activation enthalpies of mobility. Below 200 °C, all samples exhibit a strongly inverse temperature dependency characteristic of conduction in the 1st physisorbed layer with increasing coverage. The preexponentials correspond well to the models of physisorption, with dissociation to and proton migration between physisorbed water molecules. The enthalpies fit well to physisorption and with enthalpies of dissociation and proton mobility close to those of liquid water. We have by this introduced models for proton conduction in chemisorbed and physisorbed water on ZrO2, applicable to other oxides as well, and shown that preexponentials are quantitatively assessable in the order-of-magnitude level to discriminate models via a simple brick layer model based topographical analysis of the ceramic microstructure.
研究领域:
材料科学
·
电化学
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2021
·Vol. 77
·期 3
·269-278
·
IF 1.426
Zizheng Yue,Wenlin Feng
In this work, a fiber-optic fluoride-ion-detection Michelson interferometer based on the thin-core fiber (TCF) and no-core fiber (NCF) coated with α-Fe 2 O 3 /ZrO 2 sensing film is proposed and presented. The single-mode fiber (SMF) is spliced with the TCF and NCF in turn, and a waist-enlarged taper is spliced between them. Then, a silver film is plated on the end face of NCF to enhance the reflection. After the absorption of fluoride ion by the sensing film, the effective refractive index (RI) of the coated cladding will change, which leads to the regular red shift of the interference dip with the increasing fluoride-ion concentration. Thus, the fluoride-ion concentrations can be determined according to the corresponding dip wavelength shifts. The results show that the sensor has an excellent linear response ( R 2 = 0.995) with good sensitivity (8.970 nm/ppm) when the fluoride-ion concentration is in the range of 0–1.5 ppm. The response time is about 15 s. The sensor has the advantage of good selectivity, good temperature and pH stabilities, and can be applied to detect fluoride ion effectively.
研究领域:
光学工程
·
分析化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xin-Yue Wang,Jie Yang,Ling Zhou,Gao Song,Fan Lu,Li-Jun You,Ju-Mei Li
It is greatly significant to sense hexavalent chromium (Cr (VI)) in water because Cr (VI) is one of the most toxic heavy metals and is extremely harmful for human health and environment. In this study, we explored sensitive surface-enhanced Raman scattering (SERS) substrates for rapid detection of Cr (VI) using magnetic Fe 3 O 4 /ZrO 2 /Ag composite microspheres. We firstly coated uniform zirconium dioxide layer around Fe 3 O 4 cores to achieve Fe 3 O 4 /ZrO 2 microspheres and then deposited silver nanoparticles onto their surface via controlled reduction of AgNO 3 by n-butylamine. The SERS sensitivity of Fe 3 O 4 /ZrO 2 /Ag composite microspheres were easily tailored via facilely changing the concentration of AgNO 3 to tune the coverage of silver nanoparticles on the Fe 3 O 4 /ZrO 2 /Ag. We used 4-mercaptobenzoic acid (4-MBA) as a Raman molecule to evaluate the SERS activity of Fe 3 O 4 /ZrO 2 /Ag. They illustrated excellent SERS property as well as magnetic responsibility. The optimized Fe 3 O 4 /ZrO 2 /Ag were employed to quantitatively detect Cr (VI) in aqueous solution. The results showed good linear relationship between SERS intensities and logarithm concentrations of Cr (VI) (R 2 = 0.98) with a detection limit of low down to 10 −7 M, which is much lower than the safety value (1 μM) in drinking water of United States Environmental Protection Agency. Moreover, the highly uniform and robust Fe 3 O 4 /ZrO 2 /Ag composite microspheres display outstanding signal reproducibility (RSD = 8.34 %) and good storage stability. These results indicate that the prepared Fe 3 O 4 /ZrO 2 /Ag composite microspheres have promising application prospect for SERS analysis of environmental pollutants.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2020
·
IF 4.748
Min Wang,Shupeng Guo,Ming Xia,Jungang Wang,Zhongyi Ma,Bo Hou,Litao Jia,Debao Li
Whether Co-ZrO 2 interfacial sites have a beneficial effect on Co-based Fischer-Tropsch synthesis is still controversial. In this paper, different quantities of Co-ZrO 2 interfacial sites were fabricated by changing the impregnation sequence of Zr added to Co/SiC catalysts. The effect of the Co-ZrO 2 interfacial sites was investigated by nitrogen adsorption, X-ray diffraction (XRD), hydrogen chemisorption (H 2 -TPD), temperature-programmed reduction (H 2 -TPR) and TEM-EDS- mapping analyses. It was found that when zirconium was on the surface of cobalt, more Co-ZrO 2 interfacial sites were formed, and a higher selectivity of long-chain hydrocarbons was observed. In addition, the formation of Co-ZrO 2 interfacial sites significantly increased the conversion frequency of CO. This work is of great significance for understanding the role of Co-ZrO 2 interfacial sites and guiding the design of related catalysts in Co-based Fischer-Tropsch synthesis.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Lanlan Shi,Xiaojun Wang,Feike Zhang,Jingxian Li,Yuanming Liu,Weijie Fu,Shuyun Yao,Shiyu Wang,Kang Ji,Yingjie Ji,Zhiyu Yang,Liwen Zhang,Jiangzhou Xie,Yi-Ming Yan
Palladium metal catalysts have emerged as the preferred choice for alkaline formate oxidation reaction (FOR) due to their high activity. However, their strong binding with adsorbed H (Had) allows Had to occupy the active site, resulting in slow FOR kinetics. Herein, we developed a ZrO2/Pd/C catalyst to decrease the Had binding strength on Pd active sites, thereby enhancing the FOR in alkaline media. Through experimental investigations and density functional theory (DFT) calculations, we elucidated the relationship between the d-band center of Pd and hydrogen binding energy (HBE). Our findings reveal that electron transfer from ZrO2 to Pd, driven by the work function disparity, results in a downshift of the d-band center of Pd. This shift weakens the HBE at Pd active sites, facilitating the desorption of Had intermediates and thereby improving catalytic efficiency. As a result, the ZrO2/Pd/C catalyst demonstrated a 2.8-fold increase in activity over commercial Pd/C, exhibiting a lower peak potential and a significantly higher peak current of 1787 mA mg–1. This work advances our understanding of the interplay between electronic structure and catalytic performance, setting a benchmark for high-performance electrocatalysts in energy conversion technologies.
研究领域:
催化
·
电化学
·
材料科学
·
能量转换
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2023
·Vol. 43
·期 3
·1167-1176
·
IF 8.8
Wang Meng-Fei,Lai Hua-Jun,Liang Ji-Sheng,Chen Jun-Liang,Ding Wang-Yang,Zhou Qi,Peng Ying,Liu Cheng-Yan,Miao Lei
SiGe-based thermoelectric (TE) materials have gained increasing interests due to their low maintenance costs, environmental friendliness and long lifespan. However, the intrinsically high thermal conductivity of Si-based materials also results in poor TE properties. In this investigation, a zirconia (ZrO 2 ) composite strategy was applied to an n-type SiGe alloy, tremendously elevating its TE performance. After mechanical alloying and spark plasma sintering (SPS) processes, the ZrO 2 induced the formation of nanopores in the SiGe matrix via phosphorus adsorption. Moreover, such increase in porosity enhanced the phonon scattering and dramatically suppressed lattice thermal conductivity, from 2.83 to 1.59 W·m −1 ·K −1 at 873 K. Additionally, reduced phosphorus doping led to an increase in Seebeck coefficients and a relatively minor decrease in electrical conductivity. The power factor didn’t deteriorate significantly, either, as its maximum of ~ 3.43 mW·m −1 ·K −2 was achieved at 873 K with (Si 0.8 Ge 0.2 ) 0.097 P 0.03 (ZrO 2 ) 0.003 . In short, a peak figure of merit ( ZT ) of ~ 1.27 at 873 K and an average ZT ~ 0.7 from 323 to 873 K were obtained. This study demonstrates that the electrical and thermal transportation of SiGe material can be synergistically tuned by compositing ZrO 2 , illustrating a novel strategy to optimize the TE properties of bulk materials. Graphical abstract
研究领域:
材料科学
·
热电材料
·
凝聚态物理
·
无机非金属材料
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）