Adsorption of aroma chemicals on cotton fabric from aqueous systems

Abstract

The adsorption of aroma chemicals on cotton fabric was studied relative to the surfactant concentration, surfactant type, water solubility, and fiber morphology. The adsorption increased with increasing surfactant concentration to a maximum near the critical micelle concentration, then decreased with further increases in surfactant concentration. The adsorption also was found to be highly dependent on the fiber surface area and pore structure; dramatic differences were observed between untreated and mercerized cotton fabric and are believed to be due to morphological differences. Cationic and anionic surfactants increased the aroma chemical adsorption, which varied with surfactant type, with cetyltrimethylammonium chloride (CTAC) > sodium dodecyl sulfate (SDS) > H 2 O. Water solubility also influenced adsorption; in most cases, adsorption increased with water solubility. In addition, adsorption was also influenced by chemical structure and hydrophobic interactions. The adsorption of aroma chemicals on cotton fabric can be attributed to the aqueous solution being physically held in capillaries and pore structures within the fibular structure of cotton fiber and also to molecular interactions among the aroma chemical molecules, surfactants, and cotton substrate.Paper no. S1495 in JSD 8, 311-317 (October 2005).KEY WORDS: Adsorption, aroma chemical, cetyltrimethylammonium chloride, cotton fabric, sodium dodecyl sulfate.The adsorption of aroma chemicals from aqueous surfactant solutions on cotton fibers is of practical importance for understanding the deposition of fragrances during the laundering process. In the laundry process, surfactants are used to remove soils while simultaneously transferring aroma chemicals to the fabric. Subsequently, aroma chemicals are released during the drying, storage, and wearing stages. The deposition and retention of aroma chemicals continue to be a challenge when creating fragrances for fabric care. Escher and Oliveros (1) measured the affinity of aroma chemicals from standard fabric softener and detergent solutions for both cotton and polyacrylonitrile fabrics. They found that the logarithm of these affinities increased linearly with the logarithm of the octanol-and water-partition coefficients, measures of hydrophobicity. Similarly, Espinosa-Jimenez and GimenezMartin (2) found that sorption of cationic surfactants on fibers was influenced by the hydrophobic attraction between a fiber and the hydrophobic portion of the surfactant. Using inverse gas chromatography (GC), Reutenauer and Thielmann (3) measured the specific and dispersive free energies of interaction for aroma chemicals on cotton fabric. Their findings suggest that aroma chemical adsorption is influenced by polar forces such as hydrogen bonding. For example, the heat of sorption for amyl acetate was significantly greater than that of limonene; these authors explained this result by the fact that amyl acetate is more polar and hydrophilic than limonene (4). The adsorption of aroma chemicals differs with fiber type, with c...

Adsorption of Aroma Chemicals on Cotton Fabric in Different Aqueous Environments

“…[1][2][3][4]. Typical adsorption of an aroma chemical on cotton fabric in aqueous SDS and CTAC surfactant systems containing 10 mM and 100 mM NaCl is illustrated by the decalactone case in Fig.…”

“…Adsorption of aroma chemicals on textile fibers was found to be dependent upon the interaction between the aroma chemical and surfactant molecules [1]. Hydrophobic interactions between aroma chemical and surfactant molecules, and dissolution of the aroma chemical in surfactant hemi-micelles adsorbing on fiber enhance aroma chemical adsorption when surfactant solution are below their CMC, while aroma chemical partitioning into surfactant micelles decreased adsorption from solutions above their CMC.…”

“…Adsorption on cotton in a cationic surfactant system of cetyltrimethylammonium chloride (CTAC) was more than that in an anionic surfactant system of sodium dodecyl sulfate (SDS) [1]. Mercerized cotton fabric typically adsorbed more aroma chemical than untreated cotton.…”

ZnO Nanofiber and Nanoparticle Synthesized Through Electrospinning and Their Photocatalytic Activity Under Visible Light

“…As listed in Table I, the viscosity of the spinning solution increased with the concentration of ZnAc. The molecular structure of cellulose and cellulose derivatives often contains residual carboxyl groups, which are introduced during the manufacture and posttreatment processes 19 . Therefore, the addition of ZnAc in CA solution would allow a chelating reaction between cation Zn 2+ and carboxyl group—COO − on CA to take place, resulting in a higher CA chain entanglement and an increase of solution viscosity.…”

Controlled Release of Volatiles under Mild Reaction Conditions: From Nature to Everyday Products

“…This in turn suggests that besides influencing the volatility of fragrances, pro-fragrances may also efficiently reduce the hydrophilicity of polar fragrance raw materials, and thus generate a long-lasting effect as a result of an increased surface deposition, a fact which was confirmed by practical experience. The presence of surfactants in almost all household or bodycare consumer products is another aspect that influences the deposition of fragrance materials [205] and their precursors. The compounds can be incorporated into the micelles of the surfactant, which may then serve as a carrier to increase the deposition and also influence the release of the respective compounds.…”