par Timmermans, Jean 
;Lewin, Jacques
Référence Discussions of the Faraday Society, 15, page (195-201)
Publication Publié, 1953
;Lewin, Jacques Référence Discussions of the Faraday Society, 15, page (195-201)
Publication Publié, 1953
Article révisé par les pairs
| Résumé : | In accord with van der Waals' theory, I have given the name type du retrait complet to systems having two critical solution points and a closed saturation curve. For such systems there is a volume contraction when the components are mixed and the immiscibility surface "recedes" with increasing pressure and eventually disappears: the two components therefore become miscible? if sufficient pressure is applied. In mixtures of this class one component is usually water, heavy water or glycerine, and the second component an organic compound taken from the middle of a homologous series; if a lower homologue is taken, the components become miscible at atmospheric pressure, but the mixture displays all the anomalies usually observed in the neighbourhood of a critical point. It would therefore be possible to study. the saturation curve only using a negative pressure, and I have pointed out a possibility of evaluating the magnitude of the required negative pressure by making use of a third component which displaces the saturation curve so that it appears at ordinary pressures. This theory has been practically forgotten abroad, but I wish to point out its usefulness in explaining many apparent anomalies to be found with such common systems as aqueous solutions of the lower alcohols, acetone, pyridine, etc. |
