ORGANIC ELECTRONICS
·
2021
·
IF 3.721
Yijia Zhou,Xiaofeng Zhao,Yingna Zhang,Feng Dou,Shuhong Wang,Cheng Wang
The poly[2,7-9-(9-heptadecanyl)-9H-carbazole-co-benzo[4,5] imidazole[2,1-a]isoindol-11-one] (PCz-O) was synthesized by Suzuki coupling reaction, which structure was verified by FT-IR, 1 H NMR and 13 C NMR. The spin coating method was used to prepare RRAM devices based on PCz-O: ZrO 2 nanoparticle active layer, and the devices exhibited ternary switching. Through a series of performance tests, both pure polymer device and composited with ZrO 2 NPs devices had ternary storage characteristics. Among them, the content of composited with 8 wt% ZrO 2 showed the most excellent ternary storage characteristics. The ON/OFF current ratio was 2.60 × 10 4 , and the threshold voltage V th1 / V th2 was −0.60 V/-1.00 V. The current is stable for 10000 s in both ON/OFF states. After 3300 times of reading, the switch state current of the devices had slight variation. In addition, the switching mechanism of the device was also discussed. Through carefully testing and analyzing, the devices had good stability and durability, and had potential application value in terms of data storage.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 86
·期 2
·431-440
·
IF 1.745
Sun Xi,Ma Jingtao,Chen Xiaotong,Li Ziqiang,Deng Changsheng,Liu Bing
ZrC–ZrO 2 composite ceramic microspheres were prepared by internal gelation combined with carbothermic reduction using fructose as a chelating agent and carbon source. Fructose in the precursor solution formed complex with zirconium ions, which was conducive to the refining of the microstructure of the sintered composite. ZrC–ZrO 2 composite with ZrC content as high as 60 wt% could be prepared.
In this paper, fructose was used as a chelating agent and an organic carbon source to prepare ZrCO microspheres by internal gelation and carbothermic reduction. The fructose in the precursor solution could form complex with zirconium ions, which was conducive to the refining of the microstructure of the sintered composite. ZrC–ZrO 2 composite with crystal size of ZrO 2 and ZrC in nanometer range and ZrC content as high as 60 wt% could be successfully prepared.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Danqing Shen,Qian Du,Pan Wang,Yongquan Zhou,Jianming Pan
The continuous phase films in high internal phase emulsions (HIPEs), which seems to be a microchannel-like space, are benefit for confined synthesis of ultrafine adsorbent. Herein, switchable and microchannel-like space in the continuous phase of oil-in-water HIPEs is developed for fabricating ultrafine ZrO 2 anchoring cross-linked enzyme aggregates (CLEAs-ZrO 2 ), and then as-prepared composites were applied as defluoridation adsorbent. Bis(3-aminopropyl)tetramethyldisiloxane oleic acid surfactant (BTOA) can realize reversible emulsification and demulsification in response to CO 2 /N 2 switch, endowing with simple collection of products and continuous preparation. This confinement effect is expected of resulting in a 28 % increase in adsorption capacity and 33 % reduction in synthesis time. In addition, the adsorption capacity of CLEAs-ZrO 2 is nearly 4.2 times higher than that of commercially available defluoridants. In fluorine-containing industrial wastewater, the removal efficiency of fluoride ion (F - ) reaches 93 %, and the corresponding partition coefficients ( K d ) achieves the value of 31.1 L g −1 . By analyzing with XPS spectra and in-situ FT-IR spectroscopy, a strong Zr-F bonding interaction between CLEAs-ZrO 2 and F - in the solution boosts this specific adsorption. This work presents a novel method for constructing switchable confinement system, but also offers a promising defluoridation adsorbent for industrial effluents.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Vietnam Journal of Chemistry
·
2023
·Vol. 61
·期 4
·461-469
·
IF 0.9
Nguyen Thi Dieu Linh,Khuc Duong Huy,Nguyen Thi Kim Dung,Ngo Xuan Luong,Thai Hoang,Do Quang Tham
The 3D printing PMMA/ZrO 2 filaments with a diameter of 1.75 ± 0.05 mm were fabricated by using a single-screw extruder at temperatures of four heating zones of 190, 200, 210, and 210°C. Testing samples were prepared from the extruded filaments by using a fusion deposition modeling 3D printer and a Haake MiniJet piston injection molding machine. Fourier transform infrared spectroscopy, mechanical properties, field emission scanning electron microscopy (FESEM), differential scanning calorimetry, and thermogravimetric analysis of the filaments were investigated. It was suggested the formation of physical and molecular interactions between surface hydroxyl groups of ZrO 2 nanoparticles and C-O-C groups of PMMA in the PMMA/ZrO 2 filaments. FESEM images of the filaments indicated the good dispersion of ZrO 2 nanoparticles in the PMMA matrix, nevertheless, there was still the formation of clusters of ZrO 2 nanoparticles in the nanocomposite filaments. The incorporation of nano ZrO 2 increased the thermal properties, bending, and tensile moduli of PMMA. The mechanical properties of the 3D-printed samples were lower than those of the molded samples. However, the bending strength of the 3D-printed samples was much higher than 50 MPa, bending modulus was much higher than 1800 MPa, as required for acrylic bone cement (in ISO 5833:2002).
研究领域:
材料科学
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化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2018
·
IF 5.651
Chen Fan,Hongqiang Dong,You Liang,Jiale Yang,Gang Tang,Wenbing Zhang,Yongsong Cao
Cyhalothrin is lethally toxic to aquatic organisms and has caused adverse effects in the hydrosphere . It is urgent to develop efficient and sustainable material for its removal. High-quality HKUST-1 was rapidly synthesized by cholinium ionic liquids (ILs) in water at room temperature. Yields of HKUST-1 showed obviously positive correlation with Hammett values of ILs. When applying CuCl 2 as a copper salt, the yield of products was reached up to 95.5%, which was much higher than that of reported research. The reaction could be readily scalable with high space-time yield (242512 kg m −3 d −1 ). Additionally, ZrO 2 @HKUST-1 composite was successfully synthesized through a sol-gel method without complicated heat treatment. The whole process eliminates the use of environmentally unfriendly solvents/amines and enables the production of material at a reasonable cost. The obtained HKUST-1 and ZrO 2 @HKUST-1 possessed large pore volume (0.88–0.95 cm 3 g −1 ) and high surface area (1152–1484 m 2 g −1 ). The composite material was used for the adsorption/degradation of cyhalothrin and showed superior photocatalytic activity under moderate visible light, as compared to pure ZrO 2 , HKUST-1 and commercial TiO 2 samples. ZrO 2 @HKUST-1 displayed the high cyhalothrin adsorption capacity of 333 mg g −1 through π−π stacking, which facilitated more target molecules to contact the composite in a short time. ZrO 2 incorporating with HKUST-1 protected ZrO 2 nanoparticles from rapid agglomeration, thus narrowed the band gap of the composite. Moreover, the formation of a junction between HKUST-1 and ZrO 2 effectively reduced the recombination of photoinduced carriers in composite. Therefore, the novel ZrO 2 @HKUST-1 composite can be used as a sustainable efficient heterogeneous photocatalyst for the removal of organic pollutant.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wangchang Geng,Pengfei Song,Xinrou Cao,Libing Duan
Metal oxides derived from metal-organic frameworks (MOFs) can maintain the porosity and unique structure of MOFs, giving them significant development potential in the field of gas sensing. In this study, bimetallic Ni/Zr-MOFs solid microspheres were synthesized via the solvothermal method, and NiO/ZrO 2 composites with p-p heterostructure were further prepared through an annealing process. The morphology, structure, specific surface area, and pore size of NiO/ZrO 2 composites were analyzed using a series of characterization techniques. The gas sensing performance study showed that the NiO/ZrO 2 -2 sensor exhibited higher response (32.3–100 ppm), lower detection limit (7.2 ppb), shorter response/recovery time (55 s/83 s), and excellent repeatability to triethylamine gas at the operating temperature of 240 ℃. Additionally, within a specific range (1–200 ppm), a strong linear relationship was observed between the response value and the gas concentration for the NiO/ZrO 2 -2 sensor (R 2 =0.9588). This study is expected to provide a valuable reference for designing high-performance triethylamine sensors.
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 22
·期 2
·465-471
·
IF 1.108
Liu Shu-Cheng,Yue Zi-Feng,Liu Yi
Mesoporous carbon–ZrO 2 (MCZ) composites are prepared using a simple thermal conversion of metal–organic frameworks (MOFs). By choosing a zirconium based MOFs, called UiO-66, as both the Zr and C precursor and the porous template, porous carbon–ZrO 2 hybrid materials are formed by carbonizing UiO-66 at 600 °C in an inert atmosphere. The structure, morphology, and porosity of the products were studied using powder X-ray diffraction, transmission electron microscopy, thermogravimetry, and the BET surface area method. The obtained MCZ materials exhibit a relatively high specific surface area of ~136 m 2 g −1 , a large pore size, and pore volumes of ~9.6 nm and ~0.33 cm −3 g −1 , respectively. The results also indicate that the MCZ materials have a good capacity to adsorb Congo red from an aqueous solution.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Mao Chen,Bingbing Fan,Haoyuan Lei,Zijie Song,Shaojun Zhang,Hailong Wang,Rui Zhang,Hongxia Li,Yongqiang Chen
Large size high density h-BN/ZrO 2 composites (ø = 110 mm, h = 15 mm) were rapidly prepared by spark plasma sintering (SPS) with sintering cycle 20 min. The effects of additives on the mechanical properties , microstructure evolution, and corrosion resistance of the h-BN/ZrO 2 composites were studied. The Al 2 O 3 , MgO , SiO 2 , La 2 O 3 and ZrO 2 rapidly formed heterogeneous eutectic crystals under the action of SPS. The low eutectic compounds significantly promoted the diffusion of h-BN or ZrO 2 , also increased the density. The flexural strength of h-BN/ZrO 2 composites could reach 196.31 MPa, and the apparent porosity was only 0.42 %. The additives are combined with zirconia to form a high viscosity eutectic, whose corrosion resistance to molten steel is obviously better than that of single ZrO 2 . The corrosion depth of h-BN/ZrO 2 composites was only 114 µm after corroded in molten steel at 1550 °C for 80 min. The comprehensive properties of h-BN/ZrO 2 composites were obviously improved by appropriate additives.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Ben Ma,Bo Chi,Jian Pu,Li Jian
NiO–Y 2 O 3 stabilized ZrO 2 (YSZ) composite is the state-of-the-art material for the anode support of planar solid oxide fuel cells (SOFCs). To improve its fracture toughness ( K C ), lanthanum orthoniobate LaNbO 4 is synthesized by the method of solid state reaction and added to the mixture of YSZ and NiO at the weight ratio of 47:53. The content of LaNbO 4 in the composite is in the range between 5 and 30 wt%. The microstructure of the composites is examined by scanning electron microscopy (SEM); and the chemical compatibility among the components is evaluated by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). Vickers hardness test is performed for estimating the K C of the composites. The results indicate that the K C increases with the addition of LaNbO 4 in the composites; and the toughening effect is associated with the grain-refinement in the composite and the domain switch in the monoclinic LaNbO 4 .
研究领域:
材料科学
·
能源工程
✓ 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
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 1
·126-132
·
IF 1.473
Su Xinghua,Zhou Jie,Wang Benpan,Zhao Peng
Abstract Al 2 O 3 –ZrO 2 composite ceramic nanopowders were synthesized using a polyacrylamide gel method. The mean particle size of the Al 2 O 3 –ZrO 2 nanopowders was found to decrease with increasing mole ratio of monomer to the precursor salt. The Al 2 O 3 –ZrO 2 nanopowders with mean particle size of 10 nm can be densified in 1 h at 965 °C, by application of a dc electrical field. Under a constant dc electrical field, the current density through the sample of Al 2 O 3 –ZrO 2 rose rapidly when the temperature increased to a certain value. In the sintering process, the current density was restricted when a sharp increase occurred. It was found that current density had a great effect on the sintering process in electric field-assisted sintering. Joule heating was proposed to be the main mechanism of the electric field-assisted sintering process. Graphical Abstract The Al 2 O 3 –ZrO 2 composite ceramic nanopowders were synthesized using a polyacrylamide gel method. The Al 2 O 3 –ZrO 2 nanopowders can be densified in 1 h at low temperature, by the application of a dc electrical field. Under a constant dc electrical field, the current density through the sample of Al 2 O 3 –ZrO 2 rose rapidly when the temperature increased to a certain value.
研究领域:
材料科学
·
陶瓷
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 6
·1-17
·
IF 2.009
An Mingze,Li Li,Zhang Jingjing,Zhao Lijie,Yang Changlong
In this paper, a three-dimensional ordered hollow sphere (3DOH) structure composite Pt/TiO 2 -ZrO 2 was prepared by using polystyrene (PS) colloidal spheres as the template and combining with two-step vacuum impregnation method, of which the composition, crystalline structure, morphology, and surface physicochemical properties were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance (UV-vis/DRS), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and nitrogen adsorption-desorption measurements. The results illustrate the crystal type of 3DOH Pt/TiO 2 -ZrO 2 is mainly anatase TiO 2 and tetragonal ZrO 2 phase, which exhibits a three-dimensional ordered hollow sphere structure. Hollow spheres are arranged orderly; moreover, the composite shows a strong absorption in the visible region due to the effect of surface plasmon absorption (SPA) after doping Pt nanoparticles. Meanwhile, the photocatalytic activity of 3DOH Pt/TiO 2 -ZrO 2 was investigated by using Congo red as the model molecule. The results show that 3DOH Pt/TiO 2 -ZrO 2 has good photocatalytic activity under multi-modes photocatalytic experiments, and its activity is higher than that of P25, ZrO 2 , and other Pt/TiO 2 -ZrO 2 not treated by PS colloidal spheres. In addition, the total amount of hydrogen production of 3DOH Pt/TiO 2 -ZrO 2 is 100 times as much as the commercial P25 in the photocatalytic hydrogen evolution experiment (8 h), which shows an excellent photolysis of water hydrogen production activity.
The three-dimensional ordered hollow sphere composite 3DOH Pt/TiO 2 -ZrO 2 was prepared by using polystyrene colloidal spheres (PS) as the template and combining with the two-step vacuum impregnation method, which had both good photocatalytic activity under multi-modes and ability on photocatalytic hydrogen evolution.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 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）