%0 Online Multimedia
%A Fujiwara, Masahiro
%A Shiokawa, Kumi
%A Monobe, Hirosato
%A Shimizu, Yo
%D 2015
%T Temperature
Control of Light Transmission Using Mixed
System of Silica Hollow Particles with Nanoparticle Shell and Organic
Components
%U https://acs.figshare.com/articles/media/Temperature_Control_of_Light_Transmission_Using_Mixed_System_of_Silica_Hollow_Particles_with_Nanoparticle_Shell_and_Organic_Components/2213779
%R 10.1021/am508205p.s003
%2 https://acs.figshare.com/ndownloader/files/3849331
%K mixture
%K light reflection ability
%K Silica Hollow Particles
%K light reflection
%K light transmission
%K indices
%X We
reported before that a silica hollow particle whose shell consists
of silica nanoparticle (SHP-NP) has a high light reflection
ability to prevent light transmission through the particle, which
is caused from the intensive light diffusion by the hollow structure
and the nanoparticle of the shell. Since the difference in the refractive
indices between silica and air is responsible for the strong light
reflection, the mixing of the particle with organic components having
refractive indices close to that of silica such as tetradecane produced
transparent mixtures by suppression of the light reflection. The transparency
of the mixtures thus prepared could be controlled by temperature variation.
For example, the mixture of the particle SHP-NP with
tetradecane was transparent at 20 °C and opaque at 70 °C,
while the mixture with n-hexyl cyclohexane was opaque
at 20 °C and transparent at 70 °C. As the refractive indices
of organic components changed with temperature more than 10 times
wider than that of silica, the temperature alternation produced a
significant change in the difference of the refractive indices between
them to achieve complete control of the transparency of the mixtures.
This simple control of the light transmission that can automatically
regulate sunlight into the room with temperature alteration is expected
to be suitable for smart glass technology for energy conservation.
%I ACS Publications