The reaction of CFCl 2 CH 2 Cl over the stoichiometric Cr 2 O 3 (101 h2) surface yields CFCldCH 2 , HCtCH, and surface halogen. The 1,2-dihalo-elimination reaction to CFCldCH 2 is initiated via C-Cl bond cleavage at the CFCl 2 -end of the molecule to give a -CFClCH 2 Cl haloalkyl surface intermediate. A rate-limiting β-chlorine elimination from the surface alkyl gives rise to the CFCldCH 2 product. Acetylene is formed by the subsequent reaction of CFCldCH 2 in series. The chlorine liberated from CFCl 2 CH 2 Cl binds at the five-coordinate surface Cr 3+ sites on the stoichiometric surface and shuts down the dehalogenation chemistry by site blocking. No carbon buildup is observed on deactivated surfaces, and no evidence is seen for the replacement of surface lattice oxygen by halogen under the conditions of this study. At elevated temperatures, the thermal removal of surface chlorine is observed, and it is attributed to migration into the sample bulk.
A corneal mold is described that provides an MK corneal button of normal thickness and curvature from an edematous, post-mortem button. The uniform, processed tissue can then be used for experimental refractive surgery.
Efficient artificial photosynthesis systems are currently realized as catalyst- and surface- functionalized photovoltaic tandem- and triple-junction devices, enabling photoelectrochemical (PEC) water oxidation while simultaneously recycling CO2 and generating hydrogen as...
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