Article

Intercalation of anionic organic ultraviolet ray absorbers into layered zinc hydroxide nitrate.

CEPESQ-Research Centre of Applied Chemistry, Department of Chemistry, Federal University of Paraná, P.O. Box 19081, 81531-980 Curitiba, PR, Brazil.
Journal of Colloid and Interface Science (impact factor: 3.07). 03/2010; 347(1):49-55. DOI:10.1016/j.jcis.2010.03.007 pp.49-55
Source: PubMed

ABSTRACT Layered zinc hydroxide nitrate (ZHN) was synthesized and nitrate ions were topotactically exchanged with three different anionic species of commercial organic ultraviolet (UV) ray absorbers: 2-mercaptobenzoic acid, 2-aminobenzoic acid, and 4-aminobenzoic acid. The exchange reactions were confirmed by X-ray powder diffraction (XRPD), Fourier transform infrared spectroscopy (FTIR), ultraviolet visible (UV-Vis) spectroscopy, and thermal analysis (thermogravimetry, TGA, and differential thermal analysis, DTA). In all the anionic exchanged products, evidence of grafting of the organic species onto the inorganic matrix was obtained. In general, after intercalation/grafting, the UV absorption ability was improved in relation to the use of the parent organic material, showing that layered hydroxide salts (LHS) can be good alternative matrixes for the immobilization of organic species with UV-blocking properties in cosmetic products.

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Keywords

2-aminobenzoic acid
 
2-mercaptobenzoic acid
 
4-aminobenzoic acid
 
cosmetic products
 
different anionic species
 
differential thermal analysis
 
exchange reactions
 
immobilization
 
infrared spectroscopy
 
inorganic matrix
 
Layered zinc hydroxide nitrate
 
organic species
 
parent organic material
 
thermal analysis
 
ultraviolet visible
 
UV absorption ability
 
UV-blocking properties
 
X-ray powder diffraction
 
XRPD
 
ZHN
 

Ana Cristina Trindade Cursino