Features of the sorption of water vapor and nitrogen on cellulose
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Molecular-kinetic parameters of adsorptives, i.e., water (at 300 K) and nitrogen (at 77 K) vapors, are calculated and compared at the initial steps of their adsorption by cellulose. The role of the dipole structure of water molecules is considered upon their interaction with active centers of cellulose, forming heterogeneous electric fields in its pores. The effect of the temperature of the adsorptive and the sizes of its molecules on activation penetration through narrowings of the micropores dominant in absolutely dry cellulose due to the mobility of its structure is determined. The development of a porous system upon water adsorption is demonstrated according to 1H NMR. It is concluded that low-temperature nitrogen adsorption on cellulose yields rather limited information on its structure and adsorption properties.
Keywordscellulose supramolecular structure adsorption adsorbent adsorptive dipole structure nuclear magnetic resonance (NMR)
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