The effects of oxygen-containing groups, particularly carboxylic and carbonyl groups, on the adsorption of dissolved aromatics on ash-free activated carbon have been studied. Adsorption isotherms for phenol, aniline, nitrobenzene, and benzoic acid were generated in both aqueous and cyclohexane media, using carbons with different amounts of surface oxygen groups. It was found that water adsorpti...

The adsorption of hydrogen on Ge 001 has been studied with scanning tunneling microscopy at 77 K. For low doses 100 L a variety of adsorption structures has been found. We have found two different atomic configurations for the Ge-Ge-H hemihydride and a third configuration that is most likely induced by the dissociative adsorption of molecular hydrogen. The Ge-Ge-H hemihydride is either buckled ...

Related Articles Inducing extended line defects in graphene by linear adsorption of C and N atoms Appl. Phys. Lett. 101, 253105 (2012) Hydrogen diffusion in potassium intercalated graphite studied by quasielastic neutron scattering J. Chem. Phys. 137, 224704 (2012) Polylithiated (OLi2) functionalized graphane as a potential hydrogen storage material Appl. Phys. Lett. 101, 243902 (2012) Molecula...

An apparatus has been designed and built to measure the adsorption of contaminants on the surfaces of lubricated carbon overcoats such as those used on magnetic data storage media. The device is based on a quartz crystal microbalance housed in a high vacuum chamber and can be used to make rapid measurements of both the amounts and the rates of contaminant adsorption from the gas phase during ex...

Bundles of single-walled nanotubes are promising candidates for storage of hydrogen, methane, and other hydrogen-rich molecules, but experiments are hindered by nonuniformity of the tubes. We overcome the problem by investigating methane adsorption on aggregates of fullerenes containing up to six C(60); the systems feature adsorption sites similar to those of nanotube bundles. Four different ty...

Ab initio quantum chemical calculations have been performed to study the adsorption of trichlorophosphate, dimethyl methylphosphonate, and Sarin via hydrogen bonding to Si-OH groups on the amorphous SiO2 (a-SiO2) surface. Two SiO2 models are used: a small Si5O7H8 “cagelike” cluster and a larger Si21O56H28 structure designed to approximate the local environment in a-SiO2. In the latter case, reg...

We measure the adsorption height of hydrogen-intercalated quasifreestanding monolayer graphene on the (0001) face of 6H silicon carbide by the normal incidence x-ray standing wave technique. A density functional calculation for the full (6√3×6√3)-R30° unit cell, based on a van der Waals corrected exchange correlation functional, finds a purely physisorptive adsorption height in excellent agreem...

Current environmental problems have created the need to search for cleaner fuels. Hydrogen has been proposed as a clean fuel because its combustion by-product is water. Unfortunately, hydrogen is not readily available in pure form. It is obtained from steam reforming (CH4 +2H2O→4H2 +CO2) and dry reforming (CH4 +CO2→2CO+2H2) [1] and has to be separated from methane, carbon dioxide and smaller am...

The origin of the adsorption-induced phenomena in hydrophilic polymers, such as cellulose, lies at the atomistic scale. We use molecular dynamic simulations to investigate the mechanisms by which the adsorbing polymers change their properties upon water adsorption. Despite of their limited spacial and temporal capabilities MD simulations are able to reproduce the hygroscopic swelling and moistu...