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Titolo:
Some physicochemical studies on organic eutectics and molecular complex: Urea-p-nitrophenol system
Autore:
Rai, US; Rai, RN;
Indirizzi:
Banaras Hindu Univ, Dept Chem, Varanasi 221005, Uttar Pradesh, India Banaras Hindu Univ Varanasi Uttar Pradesh India 221005 tar Pradesh, India
Titolo Testata:
JOURNAL OF MATERIALS RESEARCH
fascicolo: 4, volume: 14, anno: 1999,
pagine: 1299 - 1305
SICI:
0884-2914(199904)14:4<1299:SPSOOE>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONOTECTIC ALLOYS; ADDITION-COMPOUNDS; CHEMISTRY; SOLIDIFICATION; AMINOPHENOL; RESORCINOL; BENZIDINE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Rai, US Banaras Hindu Univ, Dept Chem, Varanasi 221005, Uttar Pradesh, India Banaras Hindu Univ Varanasi Uttar Pradesh India 221005 esh, India
Citazione:
U.S. Rai e R.N. Rai, "Some physicochemical studies on organic eutectics and molecular complex: Urea-p-nitrophenol system", J MATER RES, 14(4), 1999, pp. 1299-1305

Abstract

The phase diagram of urea-p-nitrophenol system, in the form of a temperature-composition curve, shows the formation of a 1 :1 molecular complex surrounded by two eutectics containing 0.216 and 0.777 mole fraction of p-nitrophenol. Data on growth velocity (v), obtained by measuring the rate of movement of the interface at different undercoolings (Delta T), suggest that they obey the Hillig-Turnbull equation, i.e., v = u (Delta T)(n), where u and n are constants depending on the nature of materials involved. From the heat of fusion values, determined by the differential scanning calorimetry (DSC) method, heat of mixing, entropy of fusion, roughness parameter, interfacial energy, radius of the critical nucleus, and the excess thermodynamic functions were calculated. While the x-ray diffraction data show that the eutectics are not mechanical mixtures of the components under investigation, the microstructural investigations give their characteristic features.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/10/20 alle ore 08:58:18