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Updated: Jun 29, 2026

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method

Published on: April 26, 2017

Structurally colored surfaces with antireflective, self-cleaning, and antifogging properties.

Xin Du¹, Junhui He

¹Functional Nanomaterials Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancundonglu 29, Haidianqu, Beijing 100190, China.

Journal of Colloid and Interface Science

|June 22, 2012

Summary

A simple hydrothermal alkali etching method creates uniform porous antireflective (AR) coatings on glass. This process enhances light transmittance and offers tunable colors, with potential for solar cells and optical devices.

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Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

Antireflective (AR) coatings are crucial for enhancing light transmission in optical devices.
Developing cost-effective and efficient AR coating fabrication methods is an ongoing challenge.
Soda lime glass is a widely used substrate in various technological applications.

Purpose of the Study:

To develop a simple, one-step method for fabricating uniform porous AR coatings on soda lime glass.
To investigate the effect of hydrothermal alkali etching parameters on coating properties.
To explore the multifunctional properties of the fabricated coatings.

Main Methods:

One-step hydrothermal alkali (NaOH) etching of soda lime glass.
Systematic investigation of reaction temperature, NaOH concentration, and reaction time.
Characterization of coating thickness, transmittance, reflectance, and reflected color.
Introduction of TiO(2) for additional functionalities.

Main Results:

Achieved uniform porous AR coatings composed of nanoflakes.
Maximized transmittance from 90.5% to 98.5% under optimal etching conditions.
Demonstrated tunable coating thickness and corresponding red-shift in optical spectra.
Observed structural reflected colors ranging from gray to pale blue.
Fabricated coatings exhibited AR, self-cleaning, and antifogging properties after TiO(2) introduction.

Conclusions:

The hydrothermal alkali etching method is effective for creating tunable, uniform porous AR coatings.
The fabricated coatings possess multifunctional properties, including AR, self-cleaning, and antifogging.
These advanced glass surfaces hold significant potential for applications in optical devices, solar cells, LEDs, and windows.