Showing papers by "Josep Salud published in 2003"
TL;DR: In this article, the two-component system octylcyanobiphenyl(8CB) + decylcyane-decymethyl(10CB) has been studied by means of Modulated Differential Scanning Calorimetry, optical microscopy and X-ray diffraction.
21 citations
TL;DR: In this article, the two-component system cycloheptanol (C7) + cyclooctanol(C8) has been studied by means of thermal analysis, X-ray powder diffraction, and dielectric spectroscopy.
Abstract: The two-component system cycloheptanol (C7) + cyclooctanol (C8) has been studied by means of thermal analysis, X-ray powder diffraction, and dielectric spectroscopy. In a first step, the polymorphi...
19 citations
TL;DR: In this paper, a stable phase diagram of the two-component system (heptyloxy)cyanobiphenyl (7OCB) + (octyloxy)-cyanogenobiphexyl (8OCB), which exhibits a monotropic reentrant nematic behavior was determined by means of modulated differential scanning calorimetry (MDSC), optical microscopy, and X-ray diffraction measurements.
Abstract: The complete stable phase diagram of the two-component system (heptyloxy)cyanobiphenyl (7OCB) + (octyloxy)cyanobiphenyl (8OCB) was determined by means of modulated differential scanning calorimetry (MDSC), optical microscopy, and X-ray diffraction measurements It was experimentally established that the 7OCB + 8OCB two-component system exhibits a monotropic reentrant nematic behavior A complete quantitative thermodynamic analysis, through Oonk's equal G analysis, was performed, including the calculation of the monotropic reentrant behavior and a discussion of the stable melting phase diagram Moreover, the specific-heat critical exponents (α), through second-order SmA to N transition, was obtained If these α-values, together with those corresponding to other systems sharing cyanobiphenyl (nCB and nOCB) compounds, are plotted against the normalized nematic ranges, a common and uniform crossover trend is found This behavior allows one to predict, in a simple way, the order of the SmA to N transition
14 citations
TL;DR: The polymorphism of cyclopentanol (C5H10O) has been further investigated by X-ray powder diffraction experiments and it has been found to agree with the most recent thermodynamic study.
Abstract: The polymorphism of cyclopentanol (C5H10O) has been further investigated by X-ray powder diffraction experiments and it has been found to agree with the most recent thermodynamic study [J. Chem. Thermodyn. 1995, 27, 953]. In addition to the previously reported orientationally disordered hexagonal phases I and II, the lattice symmetry of the low-temperature ordered phases III and IV have been determined by means of pattern-matching analyses both as monoclinic with Z = 24 (Cc and C2/c, respectively). The patterns revealed no significant differences between phases III and IV and the transition between both phases was found through careful determination of the variation of the lattice parameters as a function of the temperature. The strength of intermolecular interactions as well as the anisotropy in the solid phases has been analyzed by the study of the isobaric thermal-expansion tensor and the results are discussed in the light of previously reported literature covering dynamics disorder.
6 citations