Metal-organic nanotubes

Metal-organic nanotubes (MONTs) from a sheet... 

Poirier, E., R. Chahine, P. Benard, G. Dorval-Douville, L. Lafi, P.A. Chandonia, Hydrogen adsorption measurements and modeling on metal-organic frameworks and single-walled carbon nanotubes. Langmuir 22(21), 8784-8789, 2006. 

Nanoporous materials like zeolites and related materials, mesoporous molecular sieves, clays, pillared clays, the majority of silica, alumina, active carbons, titanium dioxides, magnesium oxides, carbon nanotubes and metal-organic frameworks are the most widely studied and applied adsorbents. In the case of crystalline and ordered nanoporous materials such as zeolites and related materials, and mesoporous molecular sieves, their categorization as nanoporous materials are not debated. However, in the case of amorphous porous materials, they possess bigger pores together with pores sized less than 100 nm. Nevertheless, in the majority of cases, the nanoporous component is the most important part of the porosity. 

Zhang [3] prepared iridium oxide nanotubes using metal-organic chemical vapor deposition with (methylcyclopentadienyl)(l,5-cyclooctadiene) iridium, (I), followed by heating from 200°C to 500°C. 

IINS spectroscopy is an important tool for development of understanding of the interactions between the substrate and the adsorbate in hydrogen-storage materials. In addition to carbon nanotubes 17a,b,c), activated carbon 17d), and several other materials are being actively investigated. These include metal organic framework (MOF) compounds 18b,c), zeolites 18d), and metal phosphates 18e). 

Porous materials discussed at the International Conference on Materials for Advanced Technologies 2005 included clay minerals, silicates, aluminosilicates, organosilicas, metals, silicon, metal oxides, carbons and carbon nanotubes, polymers and coordination polymers, or metal-organic frameworks (MOFs), metal and metal oxide nanoparticles, thin films, membranes, and monoliths (Zhao, 2006). 

Because of the considerable variety of materials that can be classified as porous, the discussion will be limited to several groups porous silicates and aluminosilicates, porous metal oxides and related compounds, porous polyoxometalates, metal-organic frameworks, porous carbons, carbon nanotubes, and several hybrid materials. All these materials can be viewed as relatively homogeneous from the electrochemical point of view. Metal and metal oxide nanoparticles, organic metals, fullerenes, and dendrimers, which can also be regarded as nanostructured materials, also displaying distinctive electrochemical features, will not be treated here for reasons of brevity, although their appearance in hybrid materials as modifiers for microporous materials will be discussed. 

---