The role of exchange interactions in the stability of cellulose

Abstract

The problem of the origin of biochirality and the related problem of the initial monomers' selection are still under discussion, and the main point here is not the mechanics of...

Magnetosensitivity of the Mercerization

“…1). At first glance, these results seem to contradict the initial statement that both magnetic field [35] and NaHCO 3 [38] treatment cause nanofibrils' untwisting. Indeed, the untwisting as any other king of the structure loosening should simplify the processes of dissolution and washing out of the low-molecularweight fraction.…”

“…Therefore, any kind of application capable of enforcing the nanofibrils' untwisting may be used for the acceleration of the reactions, for example, in industry. Among such factors, that provoke the untwisting, one can outline alkaline [25] and hydrosulfite treatment [38], or magnetic field action [35]. Therefore, the application of the magnetic field of hydrosulfite should provide for the acceleration of the cold alka-line treatment of cellulose, which usually used for enrichment of the raw with a high-molecular-weight fraction.…”

“…The samples of dry cellulose were weighted (approximately 2 g) and mercerised in 30 g of NaOH solution (Table 1) at room temperature (20-22 • C). The mercerization process was held either in permanent magnetic field (0.21-0.22 T, [35]) or in presence of 3 % sodium hydrosulfite (NaHSO 3 ). After the treatment, the cellulose was washed on the glass filter until the neutral pH dried at 45 • C until constant weight.…”

“…Considering the probable role of the self-assembly of chiral molecules in the early stages of chemical evolution [33,34], the magnetosensitivity of the biomolecules seems to be of particular interest. Recently, we found the structure of the cellulose to be magnetosensitive [35]. Here, we describe the effect of the permanent magnetic field on the rate of the chemical process -cold alkaline treatment.…”

“…Fig.2Infrared (A) and circular dichroism (B) spectra of nanocelluloses of different kinds. The spectrum of "classical" unmercerized nanocellulose obtained by grinding using colloidal mill MK 2000 by IKA (green line,[35]) and the spectrum of the same cellulose dried in 5 % NaOH solution (black dashed line). The spectra of nanocellulose fraction washed out from the hardwood cellulose pulp are shown in red -mercerized under magnetic field action, or in blue -control without magnetic field treatment.…”