International Journal of Applied Ceramic Technology
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2023
·Vol. 20
·期 5
·2737-2746
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IF 2.1
Zhaoping Hou,Xinhe Yang,Zihan Tian,Liangliang Liu
Porous Al 2 O 3 ceramic beads with a small-scale lamellar pore structure were prepared by the dripping-ice templating method. The densification behavior of lamellar walls and the attrition resistance of porous Al 2 O 3 beads were investigated. For the two-dimensional structural lamellar walls, the intrinsic pores shrunk, and the necking area grew during the sintering process, leading to the densification of lamellar walls and the shrinking of porous beads. In addition, the two-dimensional lamellar walls and three-dimensional Al 2 O 3 bulk are compared and possibilities of elaborating of the discrepancy in grain size and pore morphology are discussed. Attrition resistance was determined by a grinding test. The dominant attrition mechanism of porous Al 2 O 3 beads is abrasion. High sintering temperature led to a decrease in the attrition rate due to a wider necking area and denser pore walls.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
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2021
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IF 6.583
Bo Zhao,Yuchen Wang,Chongbo Wang,Ruijie Zhu,Nan Sheng,Chunyu Zhu,Zhonghao Rao
The utilization of paraffin in latent heat storage system is limited by its leakage and low thermal conductivity . To address such challenges, we prepare composite phase change materials (PCMs) with enhanced thermal conductivity and shape stability. Paraffin is supported by porous Al 2 O 3 which is synthesized by solution combustion synthesis (SCS). The porous structure of Al 2 O 3 is quite influenced by the fuel species in SCS reactions. The glycine-induced Al 2 O 3 shows highly hierarchical porous structure, which can improve the anti-leakage performance of the composites. The thermal conductivity of Al 2 O 3 /PW reaches 1.27 W/m•K with an Al 2 O 3 mass ratio of 50 wt%, which is 5 times of pure paraffin. The composite also presents acceptable latent heat capacity of higher than 100 J/g and very good thermal cycling stability. These characteristics assure the promising application of Al 2 O 3 /PW composites for thermal energy storage.
研究领域:
材料科学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Zhouzhou Feng,Jiajie Yu,Jinming Kong,Tianhe Wang
In this paper, a photocatalytic system for effectively degrading azo dyes is described. The nanostructured porous Al 2 O 3 layer on glass substrate (PAOG)/silver nanoparticles (AgNPs)–Hemin composites were synthesized via photochemical reduction of Ag, self-assembly of 11-mercaptoundecanoic acid (MUA) on AgNPs and subsequently linking Hemin to MUA via coordination bond. PAOG as a nanoporous template was chemically durable, highly porous and allowed chemicals conveniently immobilized on the glass surface. PAOG had a BET surface area of 151 m 2 /g which facilitated the immobilization of AgNPs. The composite was characterized by BET surface area measurements, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray analysis (EDX), Fourier transform infrared (FTIR) spectrometer and X-ray photoelectron spectroscopy (XPS). The photoreaction degradation processes were examined by UV/vis spectroscopy. Methyl orange (MO) and Acid red 18 solutions were used to evaluate the photocatalytic performance of PAOG/AgNPs–Hemin composite under visible light and UV irradiation. Compared with PAOG/Hemin, the PAOG/AgNPs–Hemin composite had enhanced photocatalytic efficiency due to higher electron transfer efficiency from AgNPs to Hemin. This novel composite with enhanced broad spectrum photocatalytic properties has promising potentials in degradation of dyes by UV and visible light utilization.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Hengyang Mao,Hengqi Shi,Zhijie Zhang,Shouyong Zhou,Minghui Qiu,Mingmin Jia,Meisheng Li,Yijiang Zhao,Shanshan Xia,Zhentao Wu
Ceramic membranes have drawn attention in oil-in-water (O/W) treatment due to natural hydrophilicity and excellent chemical stability, however their application was restricted by high cost. In this work, a cost-effective Al 2 O 3 -based ceramic support was prepared at sintering temperature of 1500 °C with low-cost mixed-dimensional attapulgite (MDATP) as aid. The composite support with addition of 10 wt% MDATP and 3 wt% powdered carbon possessed an average pore size of 3 µm, bending strength of 63.7 MPa, pure water permeability of 1.32 × 10 4 L·m −2 ·h −1 ·bar −1 . Mullite was formed due to the reaction between Al 2 O 3 and SiO 2 in MDATP during sintering, which played a key role in preparing support with corrosive resistance performance. Then, a superwetting microfiltration (MF) membrane with pore size of 0.18 µm and permeability of 1470 L·m −2 ·h −1 ·bar −1 was obtained by coating ATP nanofiber on the Al 2 O 3 -MDATP support with sintering temperature of 600 °C. The molecular dynamics results showed that the ATP can repel oil fouling with interaction energy of − 872 Kcal·mol −1 . The excellent O/W emulsion separation efficiency of the MF membrane further demonstrated the feasibility of ATP and its by-products in decreasing membrane cost and improving performance.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Mao Chen,Zijie Song,Haoyuan Lei,Hailong Wang,Shaojun Zhang,Rui Zhang,Hongxia Li,Bingbing Fan,Yongqiang Chen
Customized porous Al 2 O 3 -ZrO 2 -mullite composites were designed and prepared by reaction sintering of zircon (ZrSiO 4 ) and alumina (Al 2 O 3 ) at sintering temperatures from 1400 to 1600 °C for 3 h. The mechanical properties , microstructural evolution , and reaction mechanisms of the composites were investigated. The reactions between ZrSiO 4 and Al 2 O 3 were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS). The results indicate that ZrSiO 4 and Al 2 O 3 react and form ZrO 2 and mullite . Sintering temperature has an important effect on the reaction process. At 1400 °C, Al 2 O 3 reacts directly with SiO 2 of ZrSiO 4 to form mullite and ZrO 2 , which reduces the decomposition temperature of ZrSiO 4 and promotes the decomposition of ZrSiO 4 . However, at 1600 °C, ZrSiO 4 first decomposes to form SiO 2 and ZrO 2 , and then generates mullite by the diffusion of Si. The migration of Si is the key factor for the formation of mullite. The thermal shock resistance of the composites can be significantly improved by phase transformation toughening of in-situ ZrO 2 . Therefore, increasing the proportion of ZrSiO 4 can significantly improve the mechanical properties of sample. The residual ratio of the flexural strength after thermal shock exceeded 90%, when the mass ratio of ZrSiO 4 to Al 2 O 3 was 3:1. Besides, the addition of polymethyl methacrylate could improve the porosity of materials and has a direct effect on the thermal conductivity of composites.
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
危险品化学品经营许可证（带存储）