PROGRESS IN ORGANIC COATINGS
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2022
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IF 6.206
Zhen Hong,Hanwen Jiang,Mingshan Xue,Changyin Ke,Yidan Luo,Zuozhu Yin,Chan Xie,Fang Zhang,Yun Xing
Polyurethane (PU) coatings with excellent corrosion resistance and wear resistance are regularly used in furniture coating, metal corrosion protection , electronic device protection and other fields. However, due to the shortcomings of low hydrophobicity and thermal stability, PU coatings are limited to be widely used as waterproof and breathable materials. This is expected to be improved by nanoparticles with high thermal conductivity and robust properties, such as silicon carbide (SiC). Here, the SiC-enhanced PU composite coatings modified by perfluorooctyltriethoxysilane (PFOTS) were successfully fabricated by spraying. The dispersion of SiC after chemical grafting modification of PFOTS in PU was significantly improved. The hard SiC particles provided a special micro-nano structure on the surface of the PU coating, altering the wettability of the coating from hydrophilic to superhydrophobic . The 125 wt% F-SiC/PU composite coating showed the best superhydrophobic properties with good wear resistance, anti-stripping ability, thermal stability, salt spray resistance and acid/base resistance, which depends on the uniform dispersion of SiC with high hardness and high thermal conductivity in the PU coating. The 125 wt% F-SiC/PU composite coating can present superhydrophobic properties on different substrates, such as aluminum alloy , ceramic, plastic sheet and filter paper, and have certain anti-fouling properties. This research provides a new strategy for the development of wear-resistant and anti-fouling PU superhydrophobic coatings .
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2022
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IF 7.305
Xianglei Liu,Meng Chen,Qiao Xu,Ke Gao,Chunzhuo Dang,Ping Li,Qingyang Luo,Hangbin Zheng,Chao Song,Yang Tian,Haichen Yao,Yi Jin,Yimin Xuan,Yulong Ding
Integrated solar thermal conversion and latent heat storage based on phase change materials (PCMs) has emerged as a promising way for improving solar thermal utilization by avoiding redundant energy transport processes. However, the poor solar absorptance and low thermal conductivity of PCMs prohibit achieving high solar thermal energy storage efficiency. Here, bamboo-derived silicon carbide (BSiC) eco-ceramics based phase change composites are proposed to realize efficient, rapid, and compact solar thermal energy storage. BSiC/paraffin demonstrates a high thermal conductivity of 40 W m −1 K −1 at the porosity of 66%, where 96% pores are filled with paraffin and no prominent deterioration is observed after 2500 cycles. By further loading TiN nanoparticles on BSiC skeletons, an ultrahigh solar absorptance of 96.23% is obtained due to exciting broadband plasmonic resonances. Subsequently, the solar-thermal energy storage efficiency achieves as high as 91.1% at 1.62 W cm −2 . The high-performance solar thermal energy storage benefits from continuous thermal conductive channels and excellent solar absorptance of BSiC/PCMs composites. For high temperature applications , BSiC/LiOH–LiF composites are developed and possess high thermal conductivity of 35.0 W m −1 ·K −1 and large latent heat of 309 kJ kg −1 simultaneously, but corrosion problems need to be tackled before long-time utilization. This work paves the way for applying BSiC eco-ceramics in high-performance solar thermal energy conversion and storage.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jingjing Wei,Pei Nian,Yuxuan Wang,Xiaojuan Wang,Yongda Wang,Nan Xu,Yibin Wei
Superhydrophobic-superoleophilic (SHB-SOL) wettability has proved its superiority in simultaneously enhancing the permeability and selectivity of porous interfacial materials for water-in-oil (w/o) emulsion separation. Here, ZnO nanoflower (NF) modified SiC (ZnO NF@SiC) composite ceramic membranes are reported through a chemical bath deposition method. ZnO NFs with different sizes were grown onto SiC grains forming tunable micro-nano hierarchical structures on the membrane surfaces. After n-octyltriethoxysilane grafting, all the composite ceramic membranes exhibit outstanding SHB-SOL wettability (water contact angle > 150° and sliding angle SA < 10°). The ZnO NF@SiC membrane owning a middle-sized ZnO NF displays the highest SHB-SOL property. When used for w/o emulsion separation, the SHB-SOL ZnO NF@SiC membranes show significantly improved oil flux and water rejection compared with the pristine and the sole silane grafted SiC membranes. The water rejection of the optimal membrane for 1000 ppm water-in-hexane emulsion is ∼99% and the initial state oil flux is ∼1300 L·m −2 ·h −1 under a transmembrane pressure of 1 bar, which is relatively competitive among the reported hydrophobic ceramic membranes. The mechanisms of surface hierarchical structures, wetting behavior and separation performance are further revealed. This work may offer new insights into preparing SHB-SOL ceramic membranes for practical w/o emulsion separation .
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高影响因子
Coatings
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2022
·Vol. 12
·期 5
·585
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IF 3.236
Wen Sun,Xuankun Li,Jingtao Zou,Han Guo
TiO2is widely used for the photocatalytic degradation of organic pollutants in wastewater, but the practical applications of the photocatalyst are limited due to its poor visible light absorption and low recovery rate. In this study, high production of nitrogen-doped TiO2was achieved by a hydrolysis precipitation method; the obtained N-TiO2had a small crystallite size and good dispersibility. The effect of calcining temperature on the photocatalytic performance of N-TiO2was evaluated through the degradation of methylene blue (MB) in a blue light LED irradiation cylinder, it was found the N-TiO2calcined at 400 °C showed the best photocatalytic activity. Then the N-TiO2was immobilized on SiC ceramic foam by dip-coating with PVA as the binder. The prepared N-TiO2/SiC foam showed excellent photocatalytic activity under blue light LED irradiation; as high as 96.3% of MB was degraded at optimum conditions. After five cycles of MB photodegradation, the photocatalytic activity of N-TiO2/SiC foam only changed slightly, which makes it a promising photocatalytic material for wastewater treatment.Keywords:nitrogen-doped TiO2;SiC foam;LED irradiation;photodegradation;methylene blue
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Small
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2022
·Vol. 18
·期 19
·2201039
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IF 15.153
Mingyuan Yan,Heping Zhang,Yangyang Fu,Yuelei Pan,Zhiyi Lun,Zhongxin Zhang,Pan He,Xudong Cheng
Silicon carbide (SiC) aerogels are promising thermal insulators that are lightweight and possess high thermal stability. However, their application is hindered by their brittleness. Herein, an air suction effect induction (ASEI) strategy is proposed to fabricate a super thermally insulating SiC aerogel (STISA). The ASEI strategy exploits the air suction effect to subtly regulate the directional flow of the SiO gas, which can induce directional growth and assembly of SiC nanowires to form a directional lamellar structure. The sintering time is significantly reduced by >90%. Significant improvements in the compression and elasticity performance of the STISA are achieved upon the formation of a directional lamellar structure through the ASEI strategy. Moreover, the lamellar structure endows the STISA with an ultralow thermal conductivity of 0.019 W m −1 K −1 . The ASEI strategy paves the way for structural design of advanced ceramic aerogels for super thermal insulation.
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PubMed
高影响因子
MATERIALS LETTERS
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2021
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IF 3.423
Xiuli Liu,Longchao Zhuo,Zeyu Wang,Zhao Zhao,Hongjia Zhang,Bo Yuan,Zhanjun An,Chao Li,Enhuai Yin,Tao Xu
In this letter, SiC/AlSi10Mg composites have been fabricated under different selective laser melting (SLM) processing parameters, and then heat-treated for the microstructure and property tailoring. The resulted effects on densification responses, phase constituents, microstructure evolution and mechanical properties of the SiC/AlSi10Mg composites are analyzed and discussed in detail. The results showed that the highest densification and tensile strength were achieved due to the precipitation hardening of Si and Mg 2 Si, dispersion strengthening of SiC and solid-solution strengthening of α -Al. After kept at 300 °C for 2 h, the ductility of the sample improved significantly with certain sacrifice of tensile strength due to the precipitation of β -Al 4.5 FeSi, coarsening of Si particles and weakened solid-solution effects from supersaturated α -Al.
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Additive Manufacturing
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2021
·
IF 10.998
Jiwei Cao,Muhammad Idrees,Guoqiang Tian,Jian Liu,Shufeng Xiong,Jingkun Yuan,Pei Wang,Zhiyuan Liu,Changyong Liu,Zhangwei Chen
Lightweight and strong silicon carbide (SiC) ceramics with complex lattice structures were fabricated by vat photopolymerization 3D printing technology followed by a one-step pyrolysis process . The UV-light penetration depth of the SiC ceramic slurries was increased more than three times based on the formation of SiC@SiO 2 core@shell structured particles through pre-oxidation processing. To reduce the sintering temperature and shrinkage of SiC ceramics, 40 vol% solid loading SiC@SiO 2 ceramic slurries mixed with photocurable resins containing 0–70 wt% of polysiloxane were prepared. SiC@SiO 2 /SiOC ceramic with less than 8% linear shrinkage rate was obtained after pyrolysis at 1000–1200 ℃. The pyrolyzed SiC@SiO 2 /SiOC lattice ceramics exhibited a specific strength of 4.6 × 10 4 N m/kg with a cellular density of 0.87 g/cm 3 , surpassing various other lattice structures and porous ceramics with similar porosity. The complex structure forming ability, mechanical performance and its short developing cycle make this technology to be a promising method for structural integrated SiC ceramic manufacturing.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Qizhong Li,Zhangpeng Meng,Bing Xiao,Jiaojiao Li,Kai Liu,Meijun Yang,Song Zhang,Takashi Goto,Rong Tu
HfC-HfB 2 -SiC composites were prepared by arc melting using HfC , HfB 2 and SiC powder as raw materials. The ternary eutectic composition of 16HfC-17HfB 2 -67SiC (mol%) was first identified, showing a complicated maze microstructure of HfC, HfB 2 and SiC approximately 500 nm in thickness. The eutectic temperature of the HfC-HfB 2 -SiC composite was nearly 2760 K. The Vickers hardness and fracture toughness of the HfC-HfB 2 -SiC ternary eutectic composite were 20.8 GPa and 7.7 MPa m 1/2 , respectively. With increasing temperature from 300 to 800 K, the electrical conductivity decreased from 8.8 × 10 5 to 4.3 × 10 5 Sm −1 , whereas the thermal conductivity increased from 28 to 32 W m −1 K −1 .
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高影响因子
MATERIALS RESEARCH BULLETIN
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2020
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IF 4.019
Jingru Wang,Shanhui Zhu,Yunwei Wang,Yingyong Wang,Guoqiang Jin,Xili Tong,Xiangyun Guo
The hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) under mild condition is a promising but challenging process. Herein, SiC supported Ru-Ir bimetallic catalyst exhibit enhanced catalytic activity for aqueous hydrogenation of LA into GVL under mild conditions. Comparing with monometallic Ir 3 /SiC and Ru 3 /SiC, the conversion of LA over bimetallic Ru 0.5 -Ir 2.5 /SiC catalyst increase from 51.2 % and 45.9% to 100% at 25 °C and 0.2 MPa of H 2 pressure. The enhanced catalytic activity of Ru 0.5 -Ir 2.5 /SiC catalyst originates from the electronic synergistic effect among Ru, Ir and SiC. Due to the electron transfer, electron-richened Ir nanoparticles show stronger ability for H 2 dissociation, and the SiC surface produces more active sites to accommodate hydrogen species that spill over from Ir and Ru. The adsorption and hydrogenation of LA molecules occur on the surface of SiC.
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高影响因子
FUEL PROCESSING TECHNOLOGY
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2020
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IF 4.982
Zhige Zhang,Guofeng Zhao,Guican Bi,Yunyv Guo,Jun Xie
A monolithic silicon carbide foam (SiC-foam) structured nickel and lanthanum oxide (Ni-La 2 O 3 ) nanocomposite catalyst is developed via reducing the nickel oxide and lanthanum oxide (NiO-La 2 O 3 ) precursor that can be grown onto SiC-foam surface by depositing the needed citric acid gel followed by calcination at 750 °C. By taking the advantages of homogeneous component-distribution and strong Ni-La 2 O 3 interactions in the Ni-La 2 O 3 nanocomposites, this catalyst delivers much enhanced coke-depositing/Ni-sintering resistance than the unmodified counterpart of Ni-La 2 O 3 /alumina (Al 2 O 3 ) in the titled reaction. At 850 °C, a weight hourly space velocity (WSHV) is set as 24,000 mL CH4-CO2 g Cat −1 h −1 , methane/carbon dioxide (CH 4 /CO 2 ) conversions of 71/85% are initially achieved on the Ni-La 2 O 3 /SiC-foam catalyst followed by progressively decreased to 60/72% within 50 h (h), but remain almost unchanged for the next 50 h. On the contrary, the CH 4 /CO 2 conversions on the Ni-La 2 O 3 /Al 2 O 3 catalyst rapidly drop from 49/71% to 24/40% within only 25 h due to its serious Ni-sintering and coke deposition.
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高影响因子
POWDER TECHNOLOGY
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2020
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IF 4.142
Yang Chen,Xing Wang,Chengji Deng,Chao Yu,Jun Ding,Hongxi Zhu
The Si@SiC@Si 3 N 4 composites with core-shell structure were synthesized by a catalytic nitridation method, Si powder and phenolic resin were used as the raw materials, ferric nitrate was used as the catalyst. The effect of catalyst content on synthetic powders was investigated. The results indicated that when no catalyst was added, a small amount of whiskers were formed on the surface of the Si powder. The addition of the catalyst could effectively promote the formation of SiC and Si 3 N 4 , and a double-layer core-shell structure was formed in which the inner shell is a SiC plate and the outer shell is a Si 3 N 4 whisker. However, excessive addition of the catalyst caused the resulting Si 3 N 4 whiskers to distorted and intertwined. The prepared composite materials (5 wt% catalyst) exhibited good rate capability and a specific capacitance of approximately 200 F/g at 0.5–3 A/g. Finally, the possible formation mechanism of this core-shell structure was proposed.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2020
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IF 4.495
Qianglong He,Shi Tian,Jingjing Xie,Cuili Xiang,Hao Wang,Weimin Wang,Zhengyi Fu
B 6.5 C-TiB 2 -SiC-BN composite ceramics were prepared by a novel solid-state reaction using TiCN, B, and Si as raw materials. The final products obtained by hot pressing at 1950 °C possessed a fine microstructure, homogeneous distribution, and excellent mechanical properties . The obtained bulk B 6.5 C-TiB 2 -SiC-BN composite ceramic shows a high relative density (98.8 %). The mechanical properties of the composites are anisotropic because of the orientation growth and structural characteristics of TiB 2 and h-BN grains. The values of hardness, bending strength , and fracture toughness measured along the hot-pressing direction were 19.6 GPa, 801 MPa, and 4.30 MPa m 1/2 , respectively, which were higher than those measured perpendicular to the hot-pressing direction. The formation of twin structures in B 6.5 C and SiC grains and the crack deflections induced by h-BN and TiB 2 grains are beneficial for improving the mechanical properties of these composites.
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高影响因子
危险品化学品经营许可证（带存储）