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The aim is to develop a transparent phase change composite for temperature regulation in windows with minimal optical disruption.

May 24, 2026NanomaterialsOpen Access

Highly Transparent Phase Change Smart Windows Enabled by Refractive-Index-Matched n-Octadecane@SiO2 Microcapsule Composites

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The aim is to develop a transparent phase change composite for temperature regulation in windows with minimal optical disruption.
Fabricated submicron core-shell microcapsules using n-octadecane as the PCM and silica as the shell.
Dispersed microcapsules within a refractive-index-matched polymer matrix to reduce light scattering.
Evaluated thermal energy storage capability and transmittance performance over multiple thermal cycles.
The composite achieved a visible light transmittance of 83.75% with only 5% fluctuation post phase transition.
Showing high melting enthalpy at 155.3 J g−1 and maintaining optical attenuation at 0.35% after 100 thermal cycles.
Demonstrated improved cycling stability indicating suitability for smart window applications.

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Randomized trial evaluates effective temperature regulation in smart windows, suggesting a new approach to energy saving.

Yang et al. (2026) studied this question.

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