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Titolo:
Freezing behavior in porous glasses and MCM-41
Autore:
Sliwinska-Bartkowiak, M; Dudziak, G; Gras, R; Sikorski, R; Radhakrishnan, R; Gubbins, KE;
Indirizzi:
Adam Mickiewicz Univ, Inst Fizyki, PL-61614 Poznan, Poland Adam MickiewiczUniv Poznan Poland PL-61614 yki, PL-61614 Poznan, Poland N Carolina State Univ, Raleigh, NC 27695 USA N Carolina State Univ Raleigh NC USA 27695 te Univ, Raleigh, NC 27695 USA
Titolo Testata:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
, volume: 187, anno: 2001,
pagine: 523 - 529
SICI:
0927-7757(20010831)187:<523:FBIPGA>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
LENNARD-JONES METHANE; MONTE-CARLO; SLIT PORES; SIMULATION; FLUIDS;
Keywords:
freezing behavior; porous glasses; MCM-41;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Sliwinska-Bartkowiak, M Adam Mickiewicz Univ, Inst Fizyki, Umultowska 85, PL-61614 Poznan, Poland Adam Mickiewicz Univ Umultowska 85 Poznan Poland PL-61614
Citazione:
M. Sliwinska-Bartkowiak et al., "Freezing behavior in porous glasses and MCM-41", COLL SURF A, 187, 2001, pp. 523-529

Abstract

We report experimental measurements of the melting and freezing behavior of fluids in nano-porous media. The experimental studies are for nitrobenzene in the silica based pores of controlled pore glass (CPG), Vycor and MCM-41. Dielectric relaxation spectroscopy was used to determine melting points and the orientational relaxation times of the nitrobenzene molecules in thebulk and the confined phase. It was found that the confined fluid freezes into a single crystalline structure for average pore diameters greater than20 sigma, where sigma is the diameter of the fluid molecule. For average pore sizes between 20 and 15 sigma, part of the confined fluid freezes into a frustrated crystal structure with the rest forming an amorphous region. For pore sizes smaller than 15 sigma, even the partial crystallization did not occur. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 24/09/20 alle ore 11:16:23