Research & Reviews: Journal of Material Sciences
MenuISSN:2321-6212
ISSN:2321-6212
J J Reinosa
Institute of Ceramics and Glass (CSIC), Spain
Keynote: Res. Rev. J Mat. Sci
Nowadays, sunscreens are formulated by using TiO2 and ZnO nanoparticles because they are efficient inorganic UV filters. In fact microsized TiO2 and ZnO have been increasingly replaced by TiO2 and ZnO nanoparticles in order to solve the cosmetic drawback of the white opaque sunscreens apart from the higher yield that nanoparticles suppose. Also the aggregation state of the particles in sunscreens is related to the solar protection factor (SPF) of the final emulsion. In this sense, dispersed nanoparticles into sunscreens increase the SPF value, but it means a possible leading to their incorporation into the stratum cornea, the outer layer of the skin. Moreover, when TiO2 is irradiated produces free radicals which are implicated in a number of potential health issues such as skin aging because of the formation of reactive oxygen species (ROS). In this work, composites combining TiO2 microparticles and ZnO nanoparticles have been achieved by using several synthesis and dispersion methods. It has been demonstrated by the incorporation of the different composites into sunscreens that the presence of nanoparticles anchored over TiO2 microparticles allows increasing the efficiency of nanoparticles but decreases the possible health problems by their absorption as nanoparticles. The aim of these new composites is to gain the advantages of inorganic nanoparticles avoiding their potential drawbacks. Hence, the combination of both oxides provokes higher SPF value and lower photodegradation, in comparison with TiO2 microparticles. Moreover, the disposition of ZnO and TiO2 particles means a positive synergy by the recombination of photo induced electrons holes, which decreases the formation of free radicals. Recent Publications 1. De Lucas-Gil E, Reinosa J J, et al, (2017) Exploring New Mechanisms for Effective Antimicrobial Materials: Electric ContactKilling Based on Multiple Schottky Barriers. Applied Materials and Interfaces 9(31):26219-26225. 2. �?lvarez-Docio C M, Reinosa J J, et al, (2017) 2D particles forming a nanostructured shell: A step forward cool NIR reflectivity for CoAl2O4 pigments. Dyes and Pigments 137:1-11. 3. Bessa M J, Costa C, Reinosa J J, et al, (2017) Moving into advanced nanomaterials. Toxicity of rutile TiO2 nanoparticles immobilized in nanokaolin nanocomposites on HepG2 cell line. Toxicology and Applied Pharmacology 316:114-122. 4. Reinosa J J, �?lvarez-Docio C M, et al, (2017) Hierarchical nano ZnO-micro TiO2 composites: High UV protection yield lowering photodegradation in sunscreens. Ceramics International (in press). 5. Reinosa J J, Leret P, �?lvarez-Docio C M, et al, (2016) Enhancement of UV absorption behavior in ZnO-TiO2composites. Bolet�?n de la Sociedad Espa�?±ola de Cer�?¡mica y Vidrio 55(2):55-62.
Julian J. Reinosa has her expertise in dispersion of nanoparticles, in developing of nanoparticulated microparticles and in obtaining nano and micro hierarchical composites. His studies are centered in the valuation of the developed particles and composites in comparison with microparticles or nanoparticles of similar composition in several fields. Hence, he achieved new effects in ceramics materials thanks to the dispersion and protection of oxides and metallic particles into ceramic glazes; he demonstrated the increase of the yield of UV filters when are correctly dispersed at the same time that the photodegradation is lowered; and he is studying the heating process by applying microwaves energy in particles with different dispersion grade. His expertise joined to other scientist in materials field gave rise to a spin off (AD-Particles) about the dispersion of nanoparticles and the achieving of hierarchical composites for industrial applications
Email:jjreinosa@icv.csic.es