0000000000908314
AUTHOR
Giorgio Schiro'
showing 22 related works from this author
Dynamic properties of solvent confined in silica hydrogels studied by broadband dielectric spectroscopy
2006
Supercooled Water Confined in a Silica Xerogel: Temperature and Pressure Dependence of Boson Peak and of Mean Square Displacements
2013
A silica xerogel can be obtained from an alcoxide precursor (TMOS, tetramethylortosilcate) via the sol-gel method: TMOS hydrolysis and subsequent polycondensation yields a solid, disordered, porous SiO2 matrix (average pore dimensions ~20Å). Inside the pores water is trapped and the hydration level h=gr[H2O]/gr[SiO2] can be easily controlled. The presence and temperature dependence of the boson peak (BP) in xerogel confined supercooled water was studied with inelastic neutron scattering (spectrometer IN6 at ILL, Grenoble) in xerogel samples having h=0.4 and h=0.2. After careful subtraction of the contributions arising from the matrix and from quasi-elastic scattering, the BP contribution wa…
Dynamic properties of myoglobin embedded in silica hydrogels studied through elastic and quasi-elastic neutron scattering
2006
Dynamics of myoglobin confined in silica hydrogel in comparison with hydrated powder: an elastic and quasi-elastic neutron scattering study
2006
Dynamic properties of myoglobin embedded in silica hydrogels studied through elastic neutron scattering
2005
Effects of confinement on the dynamics of a protein-solvent system studied by elastic and quasi-elastic neutron scattering
2007
Effects of confinement on protein dynamics: a neutron scattering study on myoglobin confined in silica hydrogel at different average hydration levels
2007
Dielectric properties of myoglobin at 10 GHz by microwave cavity perturbation measurements
2010
We report on the temperature dependence, at microwave (mw) frequency, of the imaginary part of the dielectric constant (En) in myoglobin powder samples with different hydration levels (h). The measurements have been performed by the cavity perturbation technique, in the range of temperature 80-345 K. The sample is located inside a glass capillary along the axis of a cylindrical copper cavity, resonating in the TE011 mode at 9.6 GHz, where the mw electric field has a node. By measuring the variation of the quality factor of the resonant cavity, one can extract the imaginary part of the dielectric constant. At temperatures higher than 230 K we observe an evident increase of the dielectric los…