[Structure: see text] The versatility of supramolecular chemistry has been exploited in constructing nanovalves based on mesoporous silica MCM-41 and the mutual recognition between secondary dialkylammonium ions and dibenzo[24]crown-8 (DB24C8). Naphthalene-containing dialkylammonium threads were tethered to the MCM-41, followed by loading with coumarin 460 and capping with DB24C8. Controlled re...

We present neutron scattering measurements of the excitations of liquid He confined in MCM-41 at wave vectors 0.35 Å<q<2.15 Å . MCM-41 is a uniform porous material consisting of cylindrical pores, here of 32 Å diameter. The location and phase of He in the pores was well characterized by pressure isotherms and by exploratory neutron scattering measurements. The first 60% of He entering the MCM-4...

chemical vapor deposition was employed to synthesize carbon nanotubes with ni-loaded mcm-41 and mcm-48 as catalysts and acetylene as precursor at 750°c. mesoporous ni mcm-41 and ni mcm-48 molecular sieves were synthesized by a hydrothermal method and were characterized by xrd and n2 adsorption isotherm. the catalytically synthesized carbon materials were characterized with raman spectroscopy, n...

Önemli bir hammadde olan izobütene her geçen gün talebin artması, izobütan dehidrojenasyonunu dikkat çekici konuma getirmiştir. Endotermik denge limitasyonlu bu reaksiyon için katalizör sentezi son derece önemlidir. Cr temelli katalizörler monokromatların en aktif tür olduğu bilinmektedir. Bu çalışmada, içeriğinin Cr@MCM-41 yapısına, kromat türleri ve miktarları üzerine etkilerinin araştırılmas...