Skip navigation
Skip navigation

The phase transitions of n -alkanes in mesoscopic pores of graphite

Espeau, Philippe; White, John

Description

The phase transitions of two n-alkanes of different parity, C 16H34 and C17H36, confined in the mesoscopic pores of exfoliated graphite have been studied by differential scanning calorimetry. For samples from one statistical monolayer up to about four layers of paraffin, microcalorimetry shows a characteristic signature from the "surface phase" alone. At higher fillings the melting and phase transition temperatures and enthalpies of the additional "included" phase were depressed compared to...[Show more]

dc.contributor.authorEspeau, Philippe
dc.contributor.authorWhite, John
dc.date.accessioned2015-12-13T22:53:11Z
dc.identifier.issn0008-6223
dc.identifier.urihttp://hdl.handle.net/1885/81701
dc.description.abstractThe phase transitions of two n-alkanes of different parity, C 16H34 and C17H36, confined in the mesoscopic pores of exfoliated graphite have been studied by differential scanning calorimetry. For samples from one statistical monolayer up to about four layers of paraffin, microcalorimetry shows a characteristic signature from the "surface phase" alone. At higher fillings the melting and phase transition temperatures and enthalpies of the additional "included" phase were depressed compared to those of the bulk paraffin. The depressions in the phase transition temperatures and the neperian logarithm of the enthalpies are to a good approximation inversely proportional to the number of included layers. Depending on the coverage, competing effects between the graphite surface and the degree of filling of the pores are observed for both the surface phase and the included phase. The results for the included phase are consistent with the Gibbs-Thompson equation down to pore sizes of the order of a few nanometres.
dc.publisherPergamon-Elsevier Ltd
dc.sourceCarbon
dc.subjectKeywords: Adsorption; Differential scanning calorimetry; Enthalpy; Evaporation; Melting; Paraffins; Phase transitions; Pore size; Porous materials; Thermodynamics; Exfoliated graphite; Intercalation; Microcalorimetry; N-alkanes; Graphite Differential scanning calorimetry; Exfoliated graphite; Intercalation; Microcalorimetry; Phase transitions
dc.titleThe phase transitions of n -alkanes in mesoscopic pores of graphite
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume43
dc.date.issued2005
local.identifier.absfor030603 - Colloid and Surface Chemistry
local.identifier.ariespublicationMigratedxPub10003
local.type.statusPublished Version
local.contributor.affiliationEspeau, Philippe, Universite Paris
local.contributor.affiliationWhite, John, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage1885
local.bibliographicCitation.lastpage1890
local.identifier.doi10.1016/j.carbon.2005.02.037
dc.date.updated2015-12-11T10:55:04Z
local.identifier.scopusID2-s2.0-21144450701
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Espeau_The_phase_transitions_of__n_2005.pdf147.76 kBAdobe PDF    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator