Abstract

This article presents a general infrared spectroscopic method that enables the monitoring of the adsorption of surfactants and polyelectrolytes on high surface area silica particles from aqueous solution. The method is based on the use of a ZnSe internal reflection element (IRE) coated with a layer of titania particles. The titania surface is then converted to silica using atomic layer deposition with sequential addition of an amine catalyst, gaseous SiCl₄, and water vapor. A minimum of three cycles is needed to produce a surface that mimics silica, as evidenced by the reaction of hexamethyldisilazane and zeta potential measurements. It is shown that the silica-coated titania particles on the ZnSe crystals are stable to flowing aqueous solutions below pH = 8 and can be used to study the dynamics of polymer/surfactant adsorption on silica.

Mid-IR sensing platform for trace analysis in aqueous solutions based on a germanium-on-silicon waveguide chip with a mesoporous silica coating for analyte enrichment

Nuria Teigell Benéitez, Bettina Baumgartner, Jeroen Missinne, Sanja Radosavljevic, Dominik Wacht, Stefan Hugger, Paweł Leszcz, Bernard Lendl, and Gunther Roelkens
Opt. Express 28(18) 27013-27027 (2020)

Optical interference coatings prepared from solution

Roger W. Phillips and Jerry W. Dodds
Appl. Opt. 20(1) 40-47 (1981)

Optical fiber optofluidic laser based on surfactant solubilization of rhodamine B gain in an aqueous solution

Dongyang Li, Li Zhou, Qiuhan Yu, Xiaoyun Pu, Yuze Sun, Qing Zhou, and Yuanxian Zhang
Opt. Express 30(13) 23295-23304 (2022)

Ultra-sensitive slot-waveguide-enhanced Raman spectroscopy for aqueous solutions of non-polar compounds using a functionalized silicon nitride photonic integrated circuit

Zuyang Liu, Haolan Zhao, Bettina Baumgartner, Bernhard Lendl, Andim Stassen, Andre Skirtach, Nicolas Le Thomas, and Roel Baets
Opt. Lett. 46(5) 1153-1156 (2021)

Photochemical reflective optical fiber sensor for selective detection of phenol in aqueous solutions

Zhengkun Wang, Nianbing Zhong, Ming Chen, Haixing Chang, Dengjie Zhong, Yongwu Wu, Huimin Liu, Xin Xin, Mingfu Zhao, Bing Tang, Tao Song, and Shenghui Shi
Appl. Opt. 58(8) 2091-2099 (2019)