caa a22 4500 477092055 CHVBK 20180405111517.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF01186039 doi (NATIONALLICENCE)springer-10.1007/BF01186039 Water adsorption and desorption isotherms of silica and alumina mesoporous molecular sieves [Elektronische Daten] [Sridhar Komarneni, Rajyalakshmi Pidugu, Vinayan Menon] Mesoporous molecular sieves of silica, and alumina, and porous materials of titania, zirconia, and niobia were synthesized by cationic and/or neutral templating methods. These porous materials were characterized by powder X-ray diffraction, transmission electron microscopy, N2 adsorption-desorption isotherms and water adsorption-desorption isotherms. Mesoporous molecular sieves of silica with surface areas of 956 and 1072 m2/g and of alumina with surface area of 407 m2/g were synthesized. The Ti1 Zr and Nb oxide porous materials, however, showed smaller surface areas of 258, 178, and 77 m2/g, respectively, after calcination at 300°C and exhibited only small peaks for mesopores as determined by the pore-size. distributions. Water adsorption-desorption isotherms of silica and alumina mesoporous molecular sieves showed Type V (weak interaction) and Type IV isotherms, respectively. The property of sudden filling of mesopores in theP/P 0 range of 0.45 to 0.55 in silica mesoporous molecular sieves with well-defined hysteresis during desorption, can be used in the design of humidity sensors. The titania, zirconia and niobia porous materials showed Type I water adsorption-desorption isotherms which suggests that these are mainly microporous. These results suggest that water adsorption-desorption isotherms provide valuable information about mesoporous molecular sieves for their potential use as humidity sensors. Kluwer Academic Publishers, 1996 mesoporous molecular sieves nationallicence water adsorption-desorption nationallicence cationic template nationallicence neutral template nationallicence mesoporous silica molecular sieve nationallicence mesoporous alumina molecular sieve nationallicence humidity sensor nationallicence mesoporous materials nationallicence Komarneni Sridhar Intercollege Materials Research Laboratory, The Pennsylvania State University, 16802, University Park, PA, USA aut Pidugu Rajyalakshmi Intercollege Materials Research Laboratory, The Pennsylvania State University, 16802, University Park, PA, USA aut Menon Vinayan Intercollege Materials Research Laboratory, The Pennsylvania State University, 16802, University Park, PA, USA aut Journal of Porous Materials Kluwer Academic Publishers 3/2(1996-06-01), 99-106 1380-2224 3:2<99 1996 3 10934 https://doi.org/10.1007/BF01186039 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01186039 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Komarneni Sridhar Intercollege Materials Research Laboratory, The Pennsylvania State University, 16802, University Park, PA, USA aut NATIONALLICENCE 700 1- Pidugu Rajyalakshmi Intercollege Materials Research Laboratory, The Pennsylvania State University, 16802, University Park, PA, USA aut NATIONALLICENCE 700 1- Menon Vinayan Intercollege Materials Research Laboratory, The Pennsylvania State University, 16802, University Park, PA, USA aut NATIONALLICENCE 773 0- Journal of Porous Materials Kluwer Academic Publishers 3/2(1996-06-01), 99-106 1380-2224 3:2<99 1996 3 10934 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer