THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM

	THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM
	Zhou Lixing; Chen Shuxia; Zheng Lubin
刊名	acta physico-chimica sinica
	1985
卷号	1 期号:6 页码:566-570
英文摘要	by the use of a precision automatic adiabatic calorimeter we have measured the heat capacities for water/silica adsorption system with various adsorbed amoun ts over the temperature range from 200-320k. the results obtained show that when the amount of adsorbed water makes the surface coverage (theta)larger than, the peak for phase transition of adsorbed water will appear on the c-p-t curves. this means that aggregate of water molecules adsorbed on the surface of silica has for med. on the other hand when theta<1, no phase transition is observed as the tempe rature of the system rise and then the c-p-t curves are smooth. these phemoraena are in coincidence with those in the h2o/gamma-al2o3 adsorption system. since the ad sorption force for water molecules on silica surface is weaker than that on the gamma-al2o5, the peak profiles for water/silica is sharper than that for h2o/gamma-al2o3 even if the two adsorption systems have the same amount of adsorbed water. the rise in the peak temperature with increase of amount of adsorbed water in the wa ter/silica adsorption system is faster than that in the h2o/gamma-al2o3. the fact men tioned above shows that the two dimension water adsorbed on the surface of sili ca could become bulk water easier as compared with the water adsorbed on the gamma- al2o3. besides, the heat capacities for silica without any adsorbed water over the temperature range from 200k to 300 k have been obtained by extrapolating the c-p-t curves with various adsorbed amounts at the same temperatures,
WOS标题词	science & technology ; physical sciences
类目[WOS]	chemistry, physical
研究领域[WOS]	chemistry
收录类别	SCI
语种	英语
WOS记录号	WOS:000207568200010
公开日期	2015-11-10
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/139427]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	Chinese Acad Sci, Dalian Inst Chem Phys, Beijing 100864, Peoples R China
推荐引用方式 GB/T 7714	Zhou Lixing,Chen Shuxia,Zheng Lubin. THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM[J]. acta physico-chimica sinica,1985,1(6):566-570.
APA	Zhou Lixing,Chen Shuxia,&Zheng Lubin.(1985).THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM.acta physico-chimica sinica,1(6),566-570.
MLA	Zhou Lixing,et al."THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM".acta physico-chimica sinica 1.6(1985):566-570.