Computer Science
Scientific paper
Nov 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965natur.208..777b&link_type=abstract
Nature, Volume 208, Issue 5012, pp. 777-778 (1965).
Computer Science
Scientific paper
WE have examined by infra-red spectrophotometry the reaction of alkyl trimethyl ammonium bromides of chain-length 4-20 with silica surfaces. For these investigations 10-2 M solutions of the ammonium compounds were added to `Aerosil' powder, which had been conditioned by hydration in water at 100° C for 4 h, dried and ignited at 700° C for 72 h, rehydrated as before and finally dried at 120° C. Hockey1 has shown that this treatment gives a surface containing 4.6 surface silanol groups per 100 Å2. Since optimum adsorption was found to occur within the pH range 6.6-8.5, the suspension was adjusted to pH. 1 by the addition of 10-2 M sodium hydroxide solution. After 2 h the silica plus adsorbate was centrifuged out, dried at 120° C, then pressed into a coherent wafer containing 10-15 mg sample per cm2 in a die at 12,000 lb/in.2 for 5 min. The wafer was placed in a gas cell, evacuated at a pressure of 10-5 mm of mercury for 4 h, and the infra-red spectrum recorded on a Perkin-Elmer 237 double-beam instrument.
Blackman C. F. L.
Harrop R.
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