Preparation of SiO2/cellulose composite aerogel and exploration of their property
Shan Youna1,2, Jing Zhijiao1, Ge Xuesong1, Wu Lin3, Jiang Yijun1
1.Qingdao Institute of Biomass Energy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266000; 2.Sino-Danish College,University of Chinese Academy of Sciences,Beijing 100190; 3.Qingdao Technical College,Qingdao 26600
Abstract: SiO2/cellulose composite aerogels were prepared by in-situ formation of nano-silica (SiO2) in cellulose gel matrix using cellulose as the raw material,LiOH/urea/H2O system as the solvent and Na2SiO3 as the precursor.The effect of SiO2 on the structure and properties of aerogels were studied.The results showed that composite aerogels not only kept the porous structure of pure cellulose aerogel,but also increased the specific surface area of aerogels and improved their mechanical property.When the dose of SiO2 in composite aerogels was up to 47.27wt%,the specific surface area was up to 528m2/g and the compressive strength was 6.18MPa.
[1]Kistler S S.Coherent expanded aerogels and jellies[J].Nature,1931,36(1):52-64.[2]马书荣,米勤勇,余坚,等.基于纤维素的气凝胶材料[J].化学进展,2014,26(5):796-809. [3]Pierre A C,Pajonk G M.Chemistry of aerogels and their applications[J].Chemical Reviews,2002,102(11):4243-4265. [4]Akimov Y K.Fields of application of aerogels (review)[J].Instruments and Experimental Techniques,2003,46(3):287-299. [5]徐朝阳,李健昱,石小梅,等.聚乙二醇改性纳米纤维素/聚乙烯醇复合水凝胶的制备及性能[J].复合材料学报,2017,34(4):708-713. [6]He M,Kwok R T K,Wang Z G,et al.Hair-inspired crystal growth of HOA in cavities of cellulose matrix via hydrophobic-hydrophilic interface interaction[J].ACS Applied Materials & Interfaces,2014,6(12):9508-9516. [7]Wang Z G,Fan X L,He M,et al.Construction of cellulose-phosphor hybrid hydrogels and their application for bioimaging[J].Journal of Materials Chemistry B,2014,43(2):7559-7566. [8]Han Y Y,Zhang X X,Wu X D,et al.Flame retardant,heat insulating cellulose aerogels from waste cotton fabrics by in situ formation of magnesium hydroxide nanoparticles in cellulose gel nanostructures[J].ACS Sustainable Chemistry & Engineering,2015,3(8):1853-1859. [9]刘红玲,彭俊军,李明,等.玻璃固载TiO2/纳米纤维素复合薄膜的制备及其光催化性能[J].复合材料学报,2013,30(4):163-167. [10]米春虎,姜勇刚,石多奇,等.陶瓷纤维增氧化硅气凝胶复合材料力学性能试验[J].复合材料学报,2014,31(3):635-643. [11]Cai J,Kimura S,Wada M,et al.Cellulose aerogels from aqueous alkali hydroxide-urea solution[J].Chem Sus Chem,2008,1(1/2):149-154. [12]Cai J,Liu S L,Feng J,et al.Cellulose-silica nanocomposite aerogels by in situ formation of silica in cellulose gel[J].Angew Chem Int Ed Engl,2012,51(9):2076-2079. [13]Habibi Y,Lucia L A,Rojas O J.Cellulose nanocrystals:chemistry,self-assembly,and applications[J].Chemical Reviews,2010,110(6):3479-3500. [14]Shi J J,Lu L B,Guo W T,et al.Heat insulation performance,mechanics and hydrophobic modification of cellulose-SiO2 composite aerogels[J].Carbohydrate Polymers,2013,98(1):282-289. [15]莫尊理,赵仲丽,陈红,等.纳米SiO2/纤维素复合材料的非均相制备及其性能[J].复合材料学报,2008,25(4):24-28. [16]李慧媛,吴清林,周定国.纳米二氧化硅/纳米纤维素复合材料制备及性能分析[J].农业工程学报,2015,31(7):299-303.