JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 2
·429-440
·
IF 1.947
Wang Yunjie,Yuan Hong,Zhang Zhi,Ke Yihu
A series of ordered mesoporous S 2 O 8 2−/ ZrO 2 –SiO 2 (OMSZS) solid superacids with different calcination temperatures (400–650 °C) was synthesized using zirconium n-propoxide and tetraethyl orthosilicate as the raw materials and P123 as a structure-directing agent by solvent evaporation-post-dipping method. Transmission electron microscopy and small-angle X-ray diffraction results showed that the OMSZS were all ordered. The nitrogen adsorption results indicated that the specific surface area of OMSZS could reach up to 331–385 m 2 /g, whereas the average pore diameters were in the range of 3.1–3.2 nm. The pyridine infrared results mainly displayed Lewis acids, and the ammonia (NH 3 )-temperature programmed desorption characterization showed that the NH 3 desorption of the OMSZS calcined at 550 °C was 61 cm 3 /g STP. The catalytic performance of the OMSZS was investigated by the transesterification reaction of waste frying oil and methanol. The yield of fatty acid methyl ester could reach up to 94% at 200 °C reaction temperature for 6 h. After repeated use for four times, the catalyst still featured good activity and the yield was 78%.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6422-6438
·
IF 3.5
Wenjun Yu,Zihua Lei,Xiaoyu Zhang,Qinzhao Zhang,Yongxing Cheng,Ying Deng,Yang Li,Junjie Song,Le Fu
Ceramics can be traditionally classified as structural and functional ones. However, the miniaturization and multi-functionalization of various devices require ceramics to have both structural and functional properties. In this work, we aimed to develop structure-function integrated ZrO 2 –SiO 2 nanocrystalline glass–ceramics (NCGCs) by in situ formation of homogenously distributed amorphous carbon. By reducing the calcination temperature of carbon-containing powder, organic carbon groups were partially retained in the powder and they transformed to amorphous carbon in the sintered NCGCs. At micrometer scale, the carbon was homogenously distributed in the NCGCs, avoiding the commonly encountered agglomeration problem of carbon fillers. The effects of carbon on the microstructure, mechanical properties, wear resistance, and dielectric properties of the NCGCs were investigated. Results showed that the in situ formed amorphous carbon was homogenously distributed in the ZrO 2 nanocrystallites. Meanwhile, the amorphous carbon strongly bonded with the ZrO 2 –SiO 2 NCGCs. Only a small amount of carbon was combusted even after annealing at 1000°C for 3 h. The formation of amorphous carbon led to an improvement of nanohardness and wear resistance of the NCGCs, while slightly reducing Young's modulus and flexural strength. The electromagnetic wave transmission performances were improved due to the formation of amorphous carbon. The current study paves a new way for developing structure-function integrated glass–ceramics through in situ formation of carbon. The prepared structure-function integrated ZrO 2 –SiO 2 NCGCs have great potential to be used as radome and antenna windows of aerospace aircrafts that work in harsh environment.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Gaofeng Chen,Tingzhou Lei,Zhiwei Wang,Shijie Liu,Xiaofeng He,Qian Guan,Xiaofei Xin,Haiyan Xu
A mesoporous composite CoCuK/ZrO 2 -SiO 2 catalyst with high activity and long life was prepared by vacuum impregnation and multisolvent self-assembly. The catalytic activity of the mesoporous catalyst was investigated for the synthesis of ethanol and higher alcohols from biomass syngas from wheat straw. The catalyst was characterized by small-angle X-ray diffraction, power XRD, N 2 adsorption and desorption experiments (BET), and transmission electron microscopy (TEM). The effects on the reaction activity and products from the addition of alkali metal promoter K, the modification of ZrO 2 and different copper/cobalt compositions were analyzed. The life of the catalyst was determined using a pressurized fixed-bed reactor. The results show that the catalyst possesses the high CO hydrogenation activity, high C 2+ OH selectivity and high life expectancy needed to meet industrial applications.
研究领域:
催化化学
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可再生能源
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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
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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
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材料科学
·
色谱技术
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产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 4
·2175-2183
·
IF 3.531
Lu Cheng,Wenfeng Liu,Ziqi Zhang,Yongcun Zhou,Shengtao Li
To simoutinusly achieve improved breakdown strength (BDS) and suppressed dielectric loss, a modified ternary nanocomposite composed of polypropylene (PP), maleic anhydride-grafted PP and core-shell structure SiO 2 @ZrO 2 nanoparticles is proposed. By tailoring the thickness of SiO 2 shell from 3 to 11 nm and the nanofillers content from 0.5 to 5 wt%, the particles disparsion is improved and meanwhile both the deep trap density and the interaction force between molecules are enhanced. In consequence, the restricted transportation of electrons along molecule chains as well as between chains together raise the DC BDS, that the BDS of optimum sample film reaches 430.8 kV/mm, 23% higher than neat PP. Besides, the ternary nanocomposites with SiO 2 @ZrO 2 less than 3 wt% maintain the tanδ below 0.3% at a broad frequency ranging from 0.1 Hz to 100 kHz, which is an extremely low level same as neat PP.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhanfeng Li,Xibin Yi,Jia Liu,Luyi Zhu,Ruixiang Liu,Benxue Liu
The configurations of the embedded fibers within aerogel composites influence the mechanical and thermal performances significantly, rendering the composites suitable for harsh conditions. With this regard, quartz fiber preforms were designed by carding quartz fibers wool, then layer-by-layer stacking in a space-confined mold, where the fibers were pre-compressed, resulting in spring-back behavior that opposes the direction of compression. ZrO 2 -SiO 2 aerogel precursor was infiltrated into the fiber preform to form quartz fiber reinforced ZrO 2 -SiO 2 aerogel (QFZSA) composites with the assistance of vacuum impregnation, sol-gel chemistry and supercritical drying. Thanks to the spring back effect of the fiber preform, the QFZSA composite exhibits exceptional out-plane mechanical strengths; compressive and bending strengths both reached nearly 1 MPa. In addition, the layer stacking structure of the fiber preforms efficiently suppressed conductive heat transfer as well as radiative heat transfer, endowing ultra-low thermal conductivities of 0.036 W m -1 K -1 and 0.070 W m -1 K -1 at 1000 ºC and 1200 ºC, respectively. The densities of the QFZSA composites with varying fiber volume fractions were in the range of 0.16-0.24 g cm -3 . X-ray computed tomography provided comprehensive characterization of the QFZSA composites, including fiber configuration, fiber volume fraction, interfacial area, and defect volume fraction, among others, which are important parameters governing composite properties. The as-prepared QFZSA composites are capable of finding applications in many leading-edge thermal protection fields.
研究领域:
材料科学
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航空工程
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热工学
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复合材料
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Materials Science
·
2024
·
IF 12.6
Weiwei Qi,Lan Xiang,Mingqiang Ning,Tao Liu,Yuanyuan Li,Xueheng Zhuang,Ganggang Lv,Qiang Wu,Guoguo Tan,Qingzheng Jiang,Qikui Man,Baogen Shen
With the increasing requirements of electromagnetic wave (EMW) absorption, developing EMW absorbers with high-efficiency anti-corrosion performance which can be effectively applied in extreme corrosive environments is imperative and constitutes a hot issue in the current research. Herein, based on the composition modulation of ZrO 2 and SiO 2 layer, the dual-oxides confined carbonyl iron (CI@ZrO 2 /SiO 2 ) composite displays a minimum reflection loss ( RL min ) of −48.58 [email protected] mm and an effective absorption bandwidth (EAB) of 7.62 [email protected] mm. Besides, the CI@ZrO 2 /SiO 2 displays superior corrosion resistance with corrosion current density ( i corr ) of 8.62 × 10 −7 A/cm 2 and polarization resistance ( R p ) of 3.64×10 5 Ω. This work proposes a strategy to optimize the broadband EMW absorption properties as well as the mass production toward the corrosion resistance applications.
研究领域:
材料科学
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电磁学
·
腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 3
·e70605
·
IF 4.2
Menghan Shi,Daming Sun,Zhun Su,Michal Bockowski,Lars R. Jensen,Peter K. Kristensen,Igor Seibel-Geraschenko,Christian G. Hoover,Lothar Wondraczek,Xuan Ge,Qiaodan Hu,Morten M. Smedskjaer
Compared with homogeneous glasses, glass-ceramics with heterogeneous microstructures enable multiscale architecture control to optimize their performance. In this work, we attempt to regulate the mechanical properties of ZrO 2 –SiO 2 glass-ceramics through hot compression-induced densification. The refractory glass-ceramic is first synthesized through aerodynamic levitation (containerless) melting, with the inherent immiscibility between zirconia and silica yielding a heterogeneous microstructure upon quenching, comprising a continuous silica-rich glass matrix embedded with discrete ZrO 2 crystalline phases. Upon subsequent hot compression, the overall microstructure is largely retained, but hardness displays a non-monotonic dependence on pressure, that is, decreasing at an intermediate pressure (1 GPa) and increasing at a higher pressure (2 GPa). This behavior contrasts with the monotonic hardness increase typically observed in pressure-treated oxide glasses. We attribute this distinct hardness–densification relationship to pressure-dependent interfacial binding between the glass and crystalline phases. This involves a volume contraction of the ZrO 2 phase due to the monoclinic-to-tetragonal phase transition and densification of the glass matrix phase, collectively determining the interfacial binding strength and thus hardness. Overall, this work demonstrates an alternative approach for tailoring the mechanical properties of glass-ceramics beyond conventional approaches that focus on modifying crystal phase morphology, size, or composition.
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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 8
·3138
·
IF 3.4
Bing Zhang,Ruohan Xia,Yao Yan,Jia Liu,Zisheng Guan
To improve the efficacy of polymer-based substrate hybrid coatings, it is essential to simultaneously optimize mechanical strength and preserve the optical properties. In this study, a mixture of zirconium oxide (ZrO2) sol and methyltriethoxysilane modified silica (SiO2) sol-gel was dip-coated onto polycarbonate (PC) substrates to form zirconia-enhanced SiO2hybrid coatings. Additionally, a solution containing 1H, 1H, 2H, and 2H-perfluorooctyl trichlorosilane (PFTS) was employed for surface modification. The results show that the ZrO2-SiO2hybrid coating enhanced the mechanical strength and transmittance. The average transmittance of the coated PC reached up to 93.9% (400–800 nm), while the peak transmittance reached up to 95.1% at 700 nm. SEM images and AFM morphologies demonstrate that the ZrO2and SiO2nanoparticles were evenly distributed, and a flat coating was observed on the PC substrate. The PFTS-modified ZrO2-SiO2hybrid coating also exhibited good hydrophobicity (WCA, 113°). As an antireflective coating on PC, with self-cleaning capability, the proposed coating has application prospects in optical lenses and automotive windows.Keywords:ZrO2-SiO2hybrid coating;hydrophobicity;antireflective;polycarbonate substrates
研究领域:
材料科学
·
表面工程
·
光学材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Hongwei Chu,Mingjie Xu,Benxue Liu,Zhongben Pan,Han Pan,Shengzhi Zhao,Dong Xu,Dechun Li
Amorphous oxides have unique physicochemical properties with extensive opto-electronic applications such as the thin-film transistor, light-emitting diode backplanes, and supercontinuum generation. In this contribution, we synthesize the amorphous ZrO 2 /SiO 2 nanoporous aerogel with high structural integrity. With the femtosecond excitation laser at 800–1,064 nm, the broadband second harmonic generation is observed. The nonlinear optical properties of the as-prepared ZrO 2 /SiO 2 aerogel are investigated at 1.0 μm and 1.5 μm for the first time. Subsequently, the amorphous ZrO 2 /SiO 2 saturable absorber is originally applied in the Yb-doped and Er-doped fiber lasers to realize the mode-locking operations. In the Yb-doped fiber laser, the dissipative soliton resonance mode-locking operation is demonstrated with the largest pulse duration of 22 ns at a repetition rate of 7.8 MHz and a high signal-to-noise ratio of 64 dB. In the Er-doped fiber laser, a conventional soliton mod-locking regime is observed with an ultrashort pulse width of 960 fs, a repetition frequency of 6.55 MHz, and a time-bandwidth production of 0.347. Our work shows the good ability of the ZrO 2 /SiO 2 aerogel in generating ultrafast pulses and extends the saturable absorber into the amorphous material realm.
研究领域:
材料科学
·
光学工程
·
物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Ailing Bai,Hao Song,Gaoyin He,Qingsong Li,Chong Yang,Limei Tang,Yingmin Yu
Abtract Here, a simple and reproducible method for the preparation of a well-defined zirconia@silica core–shell nanostructure is described. We studied the morphology, size, and composition of prepared nanoparticles (NPs) by transmission electron microscopy , scanning electron microscopy, dynamic light scattering, Fourier transform infrared spectroscopy , X-ray diffraction, and energy-dispersive spectroscopy. ZrO 2 NPs were synthesized through a novel alcohol–water mixed system using ZrOCl 2 ·8H 2 O as the zirconium source under mild hydrothermal conditions (110–120 °C). These NPs were then used as the core for the deposition of a silica shell via a modified Stöber method, resulting in uniform core–shell ZrO 2 @SiO 2 composites with a tunable silica shell thickness and controllable core morphology. In addition, the effect of the agent polyvinylpyrrolidone (PVP) on the formation of the core–shell structure was investigated in detail. The results demonstrated the PVP played a critical role in stabilizing the NPs and enhancing the affinity between SiO 2 and ZrO 2 .
研究领域:
材料科学
·
纳米技术
✓ 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）