A mesoporous(d=2.3mm)silica-pillared layered tetratita nate with a super gallery(d 001 =1.84mm)was prepared by first preswelling layered tetratitanate with n-dodecyl amine,then reacting with 20wt%NH 2 (CH 2 ) 3 Si (OC 2 H 5 ) 3 aqueous solution,and finally calcinating the resultant solid product i n air at 550℃.All the reaction was carried out hydrothermally in an aut oclave at 130℃.The obtained materia l has a relatively high BET surface area of204m 2 ·g -1 and a thermal stability beyond 600℃.The catalytic application of the material was also investigated by using the dehydration of isopropanol and the reform of n-hexane as two probing reactions.
A novel n-pentylamine-intercalated layered perovskite-type oxide, C5H11NH3-Sr2Nb3O10, was prepared and characterized by using XRD, FT-IR, Raman spec-trascopy, and elemental analysis. It was shown that the intercalated n-pentylamine adopted a bilayer formation with some overlap and tilt, and the lattice of the perovskite layer was distorted due to the intercalation of n-pentylamine. The as-prepared sample gave clear electric hysteresis loop and did not show fatigue after 1011 switching circles, and therefore, could be considered as a new kind of fatigue-free ferroelectric materials.
Mixtures of H2Ti ￡2￡(r)￡?Mn ￡°￡(r)￡2O￡*￡?CH￡3￡¨CH￡2 ￡(c)9NH2 ,and Si (OC2H5￡(c)4 at molar ratios of 1∶2∶20resulted in swollen and viscous gel once at room temperature,allowing the intercalation com pound in which CH￡3￡¨CH￡2￡(c)￡1 NH￡2and Si ￡¨OC￡2H￡μ￡(c)4were simultaneously intercalated i nto interlayers of H￡2Ti ￡2￡(r)￡?Mn ￡°￡(r)￡2O￡* ￡(r)The subsequent hydrolysis of the obtained intercalation compound in pure water solution for 30min at room temperature led to the formation of a new layered H￡2 Ti ￡2￡(r)8Mn 0￡(r)2O7 sample with an interlayer spacing of￡3￡(r)￡?￡μnm￡(r)Calcination of this sample i n air at ￡μ￡°￡°??gave rise to a novel mesoporous￡¨d￡1/2￡3￡(r)￡3nm￡(c)silica-pillared layered H￡2Ti ￡2￡(r)￡?Mn ￡°￡(r)2O7 with a large BET specific area of624m2·g -1 and a super￡-gallery height of ￡3￡(r)￡2￡′nm￡(r)
