Competitive interactions and controlled release of a natural antioxidant from halloysite nanotubes

Hári, József and Gyürki, Ádám and Sárközi, Márk and Földes, Enikő and Pukánszky, Béla (2016) Competitive interactions and controlled release of a natural antioxidant from halloysite nanotubes. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 462. pp. 123-129. ISSN 0021-9797

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Halloysite nanotubes used as potential carrier material for a controlled release stabilizer in polyethylene were thoroughly characterized with several techniques including the measurement of specific surface area, pore volume and surface energy. The high surface energy of the halloysite results in the strong bonding of the additive to the surface. Dissolution experiments carried out with eight different solvents for the determination of the effect of solvent characteristics on the amount of irreversibly bonded quercetin proved that adsorption and dissolution depend on competitive interactions prevailing in the system. Solvents with low polarity dissolve only surplus quercetin adsorbed in multilayers. Polyethylene is a very apolar polymer forming weak interactions with every substance; quercetin dissolves into it only above a critical concentration. Stabilization experiments confirmed that strong adhesion prevents dissolution and results in limited stabilization efficiency. At larger adsorbed amounts better stability and extended effect were measured indicating dissolution and controlled release.

Item Type: Article
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Q Science / természettudomány > QD Chemistry / kémia
Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia
Depositing User: Dr. János/J Móczó
Date Deposited: 18 Jul 2016 14:11
Last Modified: 15 Jan 2017 00:15

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