Physical properties of organic particulate UV absorbers used in sunscreens

Nanodispersed UV blockers in skin-friendly silica vesicles with superior UV-attenuating efficiency

“…5 shows a series of extinction spectra calculated from direct UV-Vis transmittance 20 (Equation S2). 21 The direct extinction is contributed by three fractions: absorbance, forward and backward scattering. Pure MBBT (green) shows no UV extinction due to the large crystal size and insolubility in water.…”

“…In the range of 360-400 nm, MBBT-SV-0.6 35 shows an increasing extinction contributed by UV scattering from nanodispersed MBBT. 21 In addition to MBBT, the silica structure is also important. If SVs were removed by dissolving silica in Na 2 CO 3 solution (0.6 M), visible white particles can be observed in the suspension (Fig.…”

Preparation of TiO2 Nanocrystallite Powders Coated with 9 mol% ZnO for Cosmetic Applications in Sunscreens

“…Most of the UV absorbers used in sunscreens are oil-soluble or even oil-miscible and consequently are incorporated into the oil phase of sunscreen emulsions [22]. Moreover, Herzog et al [22] also pointed out that the UV-attenating efficiency increased with decreasing particle size up to a maximum particle size of 80 nm.…”

“…Moreover, Herzog et al [22] also pointed out that the UV-attenating efficiency increased with decreasing particle size up to a maximum particle size of 80 nm. With smaller particles, the extinction started to decrease again.…”

Synthesis of acrylic copolymers consisting of multiple amine pendants for dispersing pigment

“…6). Apparently, the intensity of absorption is function of particle size and may be shifted to low wavelength (or a Blue-shift) by a surface area effect [22]. In addition to the UV absorption, the performance of solution transmittance, 65%, 70%, and 81% at the absorption of k = 550 nm were measured for PBGMA-acid, PBGMA-OH, and PBGMA-amine, respectively.…”