Heat of immersion of silica gel in normal alkanes and alcohols

Journal Article · Sat Dec 20 04:00:00 EST 1986 · Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States)

DOI:https://doi.org/10.1007/BF00956617· OSTI ID:6477062

Dubinin, M M; Isirikyan, A A; Nikolaev, K M; Polyakov, N S; Tatarinova, L I

In order to differentiate phenomena on a smooth surface from those related to surface curvature, they must, strictly speaking, study these phenomena separately on completely nonporous and porous adsorbents of the same chemical nature. However, it is virtually impossible to obtain a completely nonporous adsorbent with a sufficiently developed surface. Thus, a permissible compromise for solving this problem lies in the selection of a porous adsorbent such that, on one hand, the effect of surface curvature is excluded due to wide pores and, on the other hand, reliable quantitative data for the properties of this surface with virtually zero curvature are obtained due to the development of the surface. For these purposes, they used a modification of their previous method and obtained silica gel (SG) with a developed surface s = 218 m/sup 2//g and broad pores D/sub max/ = 20 nm. They found that mesoporous silica gel with 20 nm pore diameter may be taken as a practical model of nonporous amorphous silica, according to the liquid immersion heats. The heats of wetting of the hydrated amorphous silica surface by normal aliphatic alcohols and hydrocarbons are independent of the number of carbon atoms in the molecules and are 220 and 65 mJ/m/sup 2/, respectively. The interphase (liquid-solid) surface layer or normal alcohol molecules on silica gel is a Langmuir palisade with the OH alcohol groups directed toward the silica surface.

• Research Organization: Institute of Physical Chemistry, Moscow, USSR
• OSTI ID: 6477062
• Journal Information: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States), Journal Name: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States) Vol. 35:6; ISSN BACCA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORBENTS
ADSORPTION HEAT
ADSORPTION ISOTHERMS
ALCOHOLS
ALKANES
AMORPHOUS STATE
AROMATICS
BENZENE
BOND LENGTHS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL BONDS
CYCLOALKANES
CYCLOHEXANE
DIMENSIONS
ENTHALPY
ENTROPY
GLYCEROL
HYDRATES
HYDROCARBONS
HYDROXY COMPOUNDS
ISOTHERMS
LENGTH
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POROSITY
SILICA GEL
SORPTIVE PROPERTIES
SQUALANE
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
WETTABILITY