高等学校化学学报Issue(4)：689-694,6.DOI:10.7503/cjcu20140096
孔道型微孔和介孔分子筛的改性及超级绝热性能
Surface Modification of Microporous and Mesoporous Molecular Sieves and Their Super Insulation Properties
摘要
Abstract
Microporous aluminosilicates ZSM-5 , ordered mesostructured materials MCM-41 , SBA-15 , MAS-5 were synthesized in hydrothermal system. Then, these nanoparticles were electrostatically modified with linear cationic polymer agent. The as-synthesized samples were characterized by X-ray diffraction( XRD) , scanning electron microscopy( SEM) and N2 adsorption-desorption isotherms. Surface area was determined by Brunauer-Emmett-Teller( BET ) equation; pore size distribution and pore volume were measured by Barrett-Joyner-Halonda( BJH) method. Samples for thermal conductivity measurements were prepared by pressing powders into disks. The thermal conductivity of well-ordered mesoporous MCM-41 is as low as 0.038 W·m-1 ·K-1 . The thermal conductivity of MAS-5 is 0.035 W·m-1 ·K-1 . The thermal conductivities of modified MCM-41 and MAS-5 deereased to 0.028 and 0.017 W·m-1 ·K-1 respectively. Theoretical analysis and experimental results simultaneously explain that materials with smaller pore size or higher porosity demonstrate better proper-ties of thermal insulation;thermal conductivities of ordered mesoporous materials associate with wall thickness, pore size and porosity.关键词
介孔分子筛/微孔分子筛/纳米绝热材料/热导Key words
Mesoporous molecular sieve/Microporous molecular sieve/Nano thermal insulation material/Thermal conductivity分类
化学化工引用本文复制引用
张涛,董雪,张宗弢..孔道型微孔和介孔分子筛的改性及超级绝热性能[J].高等学校化学学报,2014,(4):689-694,6.基金项目
国家自然科学基金(批准号:20841003,20741001)资助.@@@@Supported by the National Natural Science Foundation of China(Nos.20841003,20741001) （批准号:20841003,20741001）
