Ordering Transitions in Short-Chain Alcohols
95
Fig. 4 Simultaneous neutron diffraction (top) and dielectric spectroscopy (bottom) data obtained
by using the ND-DS setup for the transformation of plastic crystal ethanol into the monoclinic
crystalline phase at 115 K. Experiment carried out on the diffractometer D1B at the ILL
in the intensity of the beam. As an example of the possibilities of the ND-DS setup,
Fig. 4 presents the temporal evolution of the diffraction pattern (top) and alpha
relaxation curve for ethanol during isothermal annealing at 115 K. More precisely,
it shows the transformation from the rotationally disordered plastic crystal into the
monoclinic crystal state [31]. Neutron intensity is plotted against the scattering vector
Q = 4π sin(θ)/λ, where λ is the neutron wavelength and 2θ the scattering angle.
2.1 Crystallization of 2-Propanol by ND-DS Measurements
Isopropanol (2-propanol) is a monohydroxy alcohol with a glass transition temperature (T g ) at ambient pressure of 115 K. Of paramount importance is to establish
the principal correlations between the molecular mobility and the growing structure
95
Fig. 4 Simultaneous neutron diffraction (top) and dielectric spectroscopy (bottom) data obtained
by using the ND-DS setup for the transformation of plastic crystal ethanol into the monoclinic
crystalline phase at 115 K. Experiment carried out on the diffractometer D1B at the ILL
in the intensity of the beam. As an example of the possibilities of the ND-DS setup,
Fig. 4 presents the temporal evolution of the diffraction pattern (top) and alpha
relaxation curve for ethanol during isothermal annealing at 115 K. More precisely,
it shows the transformation from the rotationally disordered plastic crystal into the
monoclinic crystal state [31]. Neutron intensity is plotted against the scattering vector
Q = 4π sin(θ)/λ, where λ is the neutron wavelength and 2θ the scattering angle.
2.1 Crystallization of 2-Propanol by ND-DS Measurements
Isopropanol (2-propanol) is a monohydroxy alcohol with a glass transition temperature (T g ) at ambient pressure of 115 K. Of paramount importance is to establish
the principal correlations between the molecular mobility and the growing structure