Hydration and Thermal Expansion in Anatase Nanoparticles.
A tunable thermal expansion is reported in nanosized anatase by taking advantage of surface hydration. The coefficient of thermal expansion of 4 nm TiO2 along a-axis is negative with a hydrated surface and is positive without a hydrated surface. High-energy synchrotron X-ray pair distribution function analysis combined with ab initio calculations on the specific hydrated surface are carried out to reveal the local structure distortion that is responsible for the unusual negative thermal expansion.
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China.
He
H
Zhu
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China.
Qiang
Q
Li
Argonne National Laboratory, X-Ray Science Division, Argonne, IL, 60439, USA.
Yang
Y
Ren
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China.
Longlong
L
Fan
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China.
Jun
J
Chen
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China.
Jinxia
J
Deng
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China.
Xianran
X
Xing
local structure; nanosized anatase; surface hydration; thermal expansion; water dissociative adsorption