Facile Synthesis of Surface-Modified Hollow-Silica (SiO2) Aerogel Particles via Oil–Water–Oil Double Emulsion Method
Abstract
:1. Introduction
2. Results and Discussion
2.1. Effect of n-Hexane to Water Glass Ratio (r) in the Primary O/W Emulsion
2.1.1. Optical Microscope Analysis
2.1.2. SEM/TEM Analysis
2.2. Effect of Surfactant [Tween20 and Span80] Concentration [s]
2.2.1. Optical Microscope Analysis
2.2.2. Zeta Potential
2.3. Effect of Silica (Water Glass) Content Concentration [x]
2.3.1. Formation Mechanism
- T is the thickness of the silica shell.
- C is the initial silica concentration.
- k is a proportionality constant.
- b is the intercept, representing the initial shell thickness when the silica concentration is minimal.
2.3.2. Morphological and Structural Study
3. Conclusions
4. Materials and Method
4.1. Materials
4.2. Method
4.2.1. Preparation of Oil-in-Water-in-Oil (OWO) Double Emulsion
4.2.2. Preparation of Hollow Silica Aerogel Powder
4.2.3. Characterization
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sr. No | First Emulsion | Second Emulsion | Surfactant | Silica Content (%) | RPM | Time | ||
---|---|---|---|---|---|---|---|---|
Water Glass (mL) | N-Hexane (mL) | N-Hexane(ml) | Tween 20 (g) | Span 80 (g) | ||||
1 | 20 | 60 | 40 | 1 | 1 | 8.68 | 6000 | 20 min |
2 | 30 | 50 | ||||||
3 | 40 | 40 | ||||||
4 | 40 | 40 | 40 | 0.5 | 0.5 | 8.68 | 6000 | 20 min |
5 | 1.5 | 1.5 | ||||||
6 | 40 | 40 | 40 | 1 | 1 | 4.92 | 6000 | 20 min |
7 | 6.09 | |||||||
8 | 8.68 |
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Kapadnis, P.S.; Nam, K.-S.; Kim, H.-Y.; Park, H.-H.; Hwang, H. Facile Synthesis of Surface-Modified Hollow-Silica (SiO2) Aerogel Particles via Oil–Water–Oil Double Emulsion Method. Gels 2024, 10, 380. https://doi.org/10.3390/gels10060380
Kapadnis PS, Nam K-S, Kim H-Y, Park H-H, Hwang H. Facile Synthesis of Surface-Modified Hollow-Silica (SiO2) Aerogel Particles via Oil–Water–Oil Double Emulsion Method. Gels. 2024; 10(6):380. https://doi.org/10.3390/gels10060380
Chicago/Turabian StyleKapadnis, Pratik S., Ki-Sun Nam, Hyun-Young Kim, Hyung-Ho Park, and Haejin Hwang. 2024. "Facile Synthesis of Surface-Modified Hollow-Silica (SiO2) Aerogel Particles via Oil–Water–Oil Double Emulsion Method" Gels 10, no. 6: 380. https://doi.org/10.3390/gels10060380