TY - JOUR
T1 - Optimization of optical transparency of personal care products using the refractive index matching method
AU - Teoman, Baran
AU - Potanin, Andrei
AU - Armenante, Piero M.
N1 - Funding Information:
This work was partially supported by a grant from the Colgate-Palmolive Company, whose support is gratefully acknowledged. One of us (BT) would like to acknowledge the partial support from Colgate-Palmolive Company to carry out this work at the Colgate Global Technology Center. We would also like to thank Mr. Greggory Marron for his contribution.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/2/5
Y1 - 2021/2/5
N2 - Many toothpastes and personal care products consist of suspensions of silica particles in aqueous gels of humectants and other soluble constituents. It is highly desirable to develop new formulations that retain the desired characteristics of the original products but also have high optical transparency. Here, we used the refractive index matching method to manufacture highly transparent toothpastes. Accordingly, we determined the refractive indexes of different liquid gels, each containing a different humectant concentration, and measured the light transmittance and turbidity of formulations containing those gels and the silica. By fine tuning the humectant fraction in the gel, we obtained toothpastes with optimal transparency and also determined the effective refractive indexes of different commercial silica. All silica had similar indexes irrespective of their supplier, particle size distribution, and morphology. We believe that this approach could be extended to other commercial products and therefore contribute to the development of new advanced formulations.
AB - Many toothpastes and personal care products consist of suspensions of silica particles in aqueous gels of humectants and other soluble constituents. It is highly desirable to develop new formulations that retain the desired characteristics of the original products but also have high optical transparency. Here, we used the refractive index matching method to manufacture highly transparent toothpastes. Accordingly, we determined the refractive indexes of different liquid gels, each containing a different humectant concentration, and measured the light transmittance and turbidity of formulations containing those gels and the silica. By fine tuning the humectant fraction in the gel, we obtained toothpastes with optimal transparency and also determined the effective refractive indexes of different commercial silica. All silica had similar indexes irrespective of their supplier, particle size distribution, and morphology. We believe that this approach could be extended to other commercial products and therefore contribute to the development of new advanced formulations.
KW - Personal care products
KW - Refractive index matching
KW - Silica dispersions
KW - Toothpaste
KW - Transparency
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U2 - 10.1016/j.colsurfa.2020.125595
DO - 10.1016/j.colsurfa.2020.125595
M3 - Article
AN - SCOPUS:85092907788
SN - 0927-7757
VL - 610
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 125595
ER -