Dynamic properties of solvent confined in silica hydrogels studied by broadband dielectric spectroscopy

Supercooled Water Confined in a Silica Xerogel: Temperature and Pressure Dependence of Boson Peak and of Mean Square Displacements

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

Dynamics of myoglobin confined in silica hydrogel in comparison with hydrated powder: an elastic and quasi-elastic neutron scattering study

Dynamic properties of myoglobin embedded in silica hydrogels studied through elastic neutron scattering

Effects of confinement on the dynamics of a protein-solvent system studied by elastic and quasi-elastic neutron scattering

Effects of confinement on protein dynamics: a neutron scattering study on myoglobin confined in silica hydrogel at different average hydration levels

Dielectric properties of myoglobin at 10 GHz by microwave cavity perturbation measurements

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…

On the physical origin of the protein dynamical transition

Is the polypeptide chain necessary for the dynamical transition in proteins?

Dynamic properties of deoxyhemoglobin in T and R quaternary conformation probed by the temperature dependence of NIR band III

The R-T quaternary transition in deoxyhemoglobin studied by NIR spectral relaxation

Dynamics of myoglobin in confinement: an incoherent elastic and quasi-elastic neutron scattering study

Dynamics of protein–solvent systems in hard confinement studied by Broadband Dielectric Spectroscopy and Neutron Scattering

THz spectroscopy studies on proteins: exploring collective modes of amyloid fibrils

Probing protein structural dynamics in a human cell

Dynamics of homomeric polypeptides studied with neutron scattering, dielectric spectroscopy and calorimetry

The contribution of methyl groups dynamics to the dynamical transition of proteins

Sub-diffusive dynamics in hydrated myoglobin powder?

Anharmonic onsets in polypeptides revealed by neutron scattering: experimental ecidences and quantitative description of energy resolution dependence

Hydration dependence of mean square displacements, relaxation times and calorimetric glass transition in myoglobin hydrated powders

The dynamic transition of myoglobin encapsulated in silica hydrogel is solvent induced?