Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica "Giovanni Stevanato", Università Ca' Foscari di Venezia , Via Torino 155/b, Venezia-Mestre I-30172, Italy.
Istituto Superiore di Sanità, Bioelement and Health Unit, Department of Environment and Health, Italian National Institute for Health , Viale Regina Elena 299, Rome 00161, Italy.
ACS Appl Mater Interfaces. 2017 Jan 18;9(2):1913-1921. doi: 10.1021/acsami.6b13252. Epub 2017 Jan 4.
The application of nanosized inorganic UV filters in cosmetic field is limited by their high photocatalytic properties that could induce the degradation or dangerous transformation of the organic molecules in sunscreen formulations. To overcome this problem and simultaneously enlarge the window of filter's absorption, we propose the growth of bismuth titanates BiTiO into mesoporous silica nanoparticles (MSN). We investigated the chemical-physical properties by means of XRPD, TEM, UV-vis spectroscopy, N physisorption, XPS, and SF-ICP-MS analysis, while the influence on the environment was evaluated through photocatalytic tests. The growing process of this new nanosystem is discussed underlining the key role of the Bi ion that, acting as a low-melting point agent for the silica framework, led to a self-sealing mechanism. The excellent UV shielding properties combined with a radical suppression of the photocatalytic activity make the proposed nanosystem a perfect candidate for the development of the next generation nanomaterials for sunscreen formulations.
纳米无机紫外线滤光剂在化妆品领域的应用受到其高光催化性能的限制，这种性能可能会导致防晒霜配方中有机分子的降解或危险转化。为了解决这个问题，同时扩大滤光器吸收的窗口，我们提出将钛酸铋生长到介孔硅纳米粒子（MSN）中。我们通过 X 射线粉末衍射（XRPD）、透射电子显微镜（TEM）、紫外可见光谱、N 物理吸附、X 射线光电子能谱（XPS）和二次离子质谱（SF-ICP-MS）分析来研究其化学物理性质，同时通过光催化测试来评估其对环境的影响。本文讨论了这种新纳米系统的生长过程，强调了 Bi 离子的关键作用，Bi 离子作为二氧化硅骨架的低熔点剂，导致了自封闭机制。该纳米系统具有优异的紫外线屏蔽性能和光催化活性的自由基抑制作用，使其成为开发下一代防晒霜配方用纳米材料的理想候选材料。
