US 11,884,578 B2
Method for preparing efficient and scalable self-cleaning coating
Biji Pullithadathil, Tamil Nadu (IN); Ravi Kottan Renganayagalu, Tamil Nadu (IN); Shalini Halan Joghee, Tamil Nadu (IN); Kamini Velusamy, Tamil Nadu (IN); Selvamani Selvaraj, Tamil Nadu (IN); Kamachi Mudali, Mumbai (IN); Nimmi Singh, Delhi (IN); Bharat Bhargava, Delhi (IN); and Deepak Kumar, Delhi (IN)
Assigned to ONGC Energy Centre Trust; and PSG Institute of Advanced Studies
Appl. No. 17/617,117
Filed by ONGC Energy Centre Trust, Delhi (IN); and PSG Institute of Advanced Studies, Tamil Nadu (IN)
PCT Filed Sep. 10, 2020, PCT No. PCT/IN2020/050786
§ 371(c)(1), (2) Date Dec. 7, 2021,
PCT Pub. No. WO2021/053688, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 2019 11038090 (IN), filed on Sep. 20, 2019.
Prior Publication US 2022/0234946 A1, Jul. 28, 2022
Int. Cl. C03C 17/25 (2006.01); C03C 17/42 (2006.01); C03C 23/00 (2006.01)
CPC C03C 17/25 (2013.01) [C03C 17/42 (2013.01); C03C 23/002 (2013.01); C03C 23/0075 (2013.01); C03C 2217/214 (2013.01); C03C 2217/425 (2013.01); C03C 2217/732 (2013.01); C03C 2217/76 (2013.01); C03C 2217/77 (2013.01); C03C 2217/78 (2013.01); C03C 2218/112 (2013.01); C03C 2218/113 (2013.01); C03C 2218/116 (2013.01); C03C 2218/31 (2013.01); C03C 2218/32 (2013.01)] 15 Claims
 
1. A sol-gel method for preparation of a self-cleaning coating solution, the method comprising the steps of:
mixing an aluminium compound with a solution of an ethanol compound to form a solution;
subjecting the formed solution to a first magnetic stirring, wherein after the first magnetic stirring a first transparent solution is formed;
adding 302 μL of stabilizing agent to the first transparent solution of the aluminium compound and the ethanol compound, wherein the stabilizing agent comprises mono-ethanolamine that decreases a rate of hydrolysis of the aluminium compound, wherein subsequent to adding the stabilizing agent a translucent solution is formed, and wherein the stabilizing agent controls reaction kinetics and forms mono-dispersed alumina nanoparticles for providing a thin film coating; and
subjecting the formed translucent solution to a second magnetic stirring for forming a homogeneous second transparent solution, wherein the second transparent solution formed is a coating solution.