Wenzhe Dong , Li Guan , Yuanzheng Lou , Jiaxin Li , Ruijie Fu , Lei Fan , Hamidreza Abadikhah , Xichen Zheng , Liwen Peng , Zhiyu Min , Biao Zhao , Binbin Dong , Rui Zhang
{"title":"Novel preparation of SiO2/C foams with tailored porosity by emulsion template method and SiO2 sol-gel technology","authors":"Wenzhe Dong , Li Guan , Yuanzheng Lou , Jiaxin Li , Ruijie Fu , Lei Fan , Hamidreza Abadikhah , Xichen Zheng , Liwen Peng , Zhiyu Min , Biao Zhao , Binbin Dong , Rui Zhang","doi":"10.1016/j.carbon.2024.119410","DOIUrl":null,"url":null,"abstract":"<div><p>SiO<sub>2</sub>/C foams with carbon particles as raw material were prepared using emulsion template combined with SiO<sub>2</sub> sol-gel technology. One significant hurdle lies in achieving scalable and cost-effective fabrication of bulk materials endowed with customized porosity, along with an optimal blend of attributes such as high mechanical strength, super-hydrophilicity, thermal insulation, and effective absorption of electromagnetic waves. SiO<sub>2</sub>/C foams with varied pore sizes and porosities were synthesized by manipulating the water-oil volume ratio in the raw materials. The impact of pore size and porosity on the compressive strength, thermal insulation, super-hydrophilicity and electromagnetic wave absorption property of SiO<sub>2</sub>/C foam materials were thoroughly investigated. The gel reaction involving inorganic SiO<sub>2</sub> not only could fix the bubbles in situ and impart sufficient mechanical properties but also confer super-hydrophilic characteristics to the SiO<sub>2</sub>/C foam materials. The SiO<sub>2</sub>/C foams exhibited adjustable porosity levels ranging from 57 % to 78 %.The SiO<sub>2</sub>/C foams, characterized by a uniform pore size of approximately 8.33 μm, demonstrated low thermal conductivity. Additionally, the compressive strength of SiO<sub>2</sub>/C foam with a porosity of 57 % was measured at 3.5 MPa. For sample S4, the minimum reflection loss (RL<sub>min</sub>) of −48 dB with an effective absorption bandwidth spanning 5.76 GHz, observed at a matching thickness of 2.2 mm. Due to their outstanding performances, characteristics, and the ease of scalable fabrication, the SiO<sub>2</sub>/C foams developed in this study showcase significant potential for diverse applications.</p></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":null,"pages":null},"PeriodicalIF":10.5000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0008622324006298","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
SiO2/C foams with carbon particles as raw material were prepared using emulsion template combined with SiO2 sol-gel technology. One significant hurdle lies in achieving scalable and cost-effective fabrication of bulk materials endowed with customized porosity, along with an optimal blend of attributes such as high mechanical strength, super-hydrophilicity, thermal insulation, and effective absorption of electromagnetic waves. SiO2/C foams with varied pore sizes and porosities were synthesized by manipulating the water-oil volume ratio in the raw materials. The impact of pore size and porosity on the compressive strength, thermal insulation, super-hydrophilicity and electromagnetic wave absorption property of SiO2/C foam materials were thoroughly investigated. The gel reaction involving inorganic SiO2 not only could fix the bubbles in situ and impart sufficient mechanical properties but also confer super-hydrophilic characteristics to the SiO2/C foam materials. The SiO2/C foams exhibited adjustable porosity levels ranging from 57 % to 78 %.The SiO2/C foams, characterized by a uniform pore size of approximately 8.33 μm, demonstrated low thermal conductivity. Additionally, the compressive strength of SiO2/C foam with a porosity of 57 % was measured at 3.5 MPa. For sample S4, the minimum reflection loss (RLmin) of −48 dB with an effective absorption bandwidth spanning 5.76 GHz, observed at a matching thickness of 2.2 mm. Due to their outstanding performances, characteristics, and the ease of scalable fabrication, the SiO2/C foams developed in this study showcase significant potential for diverse applications.
期刊介绍:
The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.