New microwave-mediated solvent-free procedures for the synthesis of 3,3,5-trimethylcyclohexanols and derived esters

Solid state NMR to characterize paper and parchment samples from a Sixteenth century book

In this chapter, a solid state Nuclear Magnetic Resonance (ss-NMR) Study of sixteenth century book is reported. Cross polarization Magic Angle Spinning Nuclear Magnetic Resonance (13C(1H) CP MAS NMR) spectra of paper samples collected from the book, allowed us to obtain information on its state of conservation. The physico-chemical characterization of two parchment samples collected from the cover book was performed trough the evaluation of the changes in line width and intensity of signals in the spectra.

Investigation on a low environmental impact solvent mixture applied to a wooden painted slab

Cleaning is one of the most complex and delicate step in a restoration project, often due to the manufacturing techniques of the artifacts and their advanced state of decay. Eco-friendly solvents can permit to execute the cleaning operations with a reduced health impact for the restorers and for the environment. In this work, the performance of the 1,3- dioxolane/methylal (DIOX-MET) solvent mixture is evaluated over a wooden painted slab that had been covered with a thin layer of a protective varnish, probably during a previous conservation work performed in the Sixties. Removal of this varnish has been considered on behalf of its yellowing degradation process, which caused chromatic change…

Solid state NMR

Small-Angle Neutron Scattering from Aqueous Solutions of C12E6 and C12E8: Critical Fluctuations and Micellar Growth

Static SANS measurements have been performed on 0.028 M C12E8 in D2O over the temperature range 20–74.2 °C. Little micellar growth is observed; increases in the scattered intensities in the low angle region are due to critical concentration fluctuations of correlation length g. We have also reexamined our SANS data for C12E6 in D2O, in light of other worker’s claims that a sphere-to-cylinder transition in micellar shape is occurring in these solutions. We discuss in detail the inferences about C12E6 micellar size drawn from the results of several different experimental techniques.