Mutual Competitive Absorption of Water and Essential Oils Molecules by Porose Ligno-Cellulosic Materials

Abstract

Competitive absorption processes, i.e. condensation, of water and essential oils (EO) are predominantly controlled by extent of condensation of diffusing water and EO molecules with marginal influence of porose ligno-cellulosic matter and a sort of EO. With increase of absorption the diffusion is depressed and vice versa. Diffusion of water molecules through porose system is usually slower in comparison with other molecules. It was discovered that a presence of EO decreases paper web humidity with increasing influence in environment with high relative air humidity. Likely, fast diffusing EO molecules decrease the ability of water molecules condensed in all accessible pores particularly in the non-penetrable pores.

Mutual Absorption of Water and Essential Oils Vapours by Lignocellulosic Material - Verification of Measured Data

“…The kinetics of paper moistening or one component vapour absorption of organic liquids is satisfactory described by the following originally empirical, later theoretically derived and experimentally verified following equation [4], herein so-called Global GHM (Generalised Hygroscopicity Model):…”

“…Absorption of water and essential oils molecules by lignocellulosic materials is described in detail in the literature [3,4].…”

The Influence of Microbicidal Components of Essential Oils on the Properties of the Cellulose and Lignocellulose Materials

“…Microbial attack on cellulose and lignocellulose materials is mainly dependent on humidity environment and the amount of condensed water in paper pores. Competitive absorption mechanisms for condensation of water and essential oil in the porous structure of the paper are described in article by Češek et al [5]. The aim of this study was to observe changes in mechanical, optical and chemical properties of the paper after application vapours of 5 mixtures compounding active bactericidal agents made of EO.…”

“…Bacteriostatic and bactericidal activity of EO of two kinds of sage (Salvia officinalis, Salvia triloba) growing in southern Brazil is devoted to the study Delamare et al (2007), the main component of the EO are eucalyptol, camphor, borneol and βpinene [4]. Using essential oils to protect cellulose-based archival documents appears to be a variant of ecological care for books that are stored in unsuitable conditions [5,6,7]. To understand the principle of aging cellulose and lignocellulose materials, it is necessary to know the mechanism of their degradation like acid hydrolysis, oxidation, photo-oxidation, photolysis or also microbiological attack.…”

Impact of some Deacidification Means on the Changes of Selected Properties of Pulp

“…Equilibrium moisture content of sample is then y r = c + y 0 . The ratio 100•c/(1+b•100 d ) characterises moistening velocity at beginning of the process, [4][5][6][7].…”