![]()
AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
|
|||||||
The STUDIA UNIVERSITATIS BABEÅž-BOLYAI issue article summary The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name. |
|||||||
STUDIA PHYSICA - Issue no. 2 / 2004 | |||||||
Article: |
FREEZING ON HEATING OF LIQUID SOLUTIONS: THE OBSERVATION OF A "LAW-BREAKING" LIQUID. Authors: M. PLAZANET, C. FLOARE, M.R. JOHNSON, R. SCHWEINS, H.P. TROMMSDORFF. |
||||||
Abstract: This is the story of a serendipitous discovery, which was made when preparing inclusion compounds of 4-methylpyridine (4MP: C6NH7) in α-cyclodextrine (αCD, the association of 6 glucose units: C6O5H10)6). At room temperature, solutions containing up to 300 g/l of 4MP in αCD are homogeneous and transparent. When heated to between 50° and 80°C, these solutions, which also contain the crystallization water of αCD, solidify. After cooling the solution to room temperature, the solid melts and the original solution is recovered. The figure below illustrates the phenomenon for a solution of 200g/l of 4MP in αCD. | |||||||
![]() |
|||||||