ePubs
The open archive for STFC research publications
Home
About ePubs
Content Policies
News
Help
Privacy/Cookies
Suggest an Enhancement
Contact ePubs
Full Record Details
Persistent URL
http://purl.org/net/epubs/work/42927
Record Status
Checked
Record Id
42927
Title
Subfemtosecond dynamics of structural protons in silica xerogels
Contributors
A Pietropaolo
,
D Fernandez-Canoto
,
E Perelli-Cippo
,
S Dire
,
P Prosposito
Abstract
Deep inelastic neutron scattering measurements on silica xerogels with different geometries (24 and 82 A pore size diameter) were performed on the VESUVIO spectrometer at the ISIS spallation neutron source, in order to investigate the modification of the ultrashort-time (10(-15)-10(-17) s) dynamics of the protons belonging to the silanol groups, when precursors are such as to modify the structural morphology. This paper is also intended to present a complementary experimental technique for the characterization of the microscopic dynamical properties of these materials. The mean kinetic energy < E-k > and the momentum distribution n(p) of the protons of the structural silanol groups in the two different systems are derived and compared at the same thermodynamic conditions. The results show that < E-k > is different for the two systems, reflecting the differences in the pore morphology. Indeed, < E-k > is higher for the system with an average pore diameter of 24 A, as compared to that of 82 A.
Organisation
ISIS
,
ISIS-VESUVIO
,
STFC
Keywords
Physics
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Phys Rev B
77, no. 1 (2008): 014202.
doi:10.1103/PhysRevB.77.014202
2008
Showing record 1 of 1
Recent Additions
Browse Organisations
Browse Journals/Series
Login to add & manage publications and access information for OA publishing
Username:
Password:
Useful Links
Chadwick & RAL Libraries
SHERPA FACT
SHERPA RoMEO
SHERPA JULIET
Journal Checker Tool
Google Scholar