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Titolo:
SPECULAR AND OFF-SPECULAR NEUTRON REFLECTIVITY OF A LOW-MOLECULAR-WEIGHT POLYSTYRENE SURFACTANT AT THE AIR-WATER-INTERFACE
Autore:
SAVILLE PM; GENTLE IR; WHITE JW; PENFOLD J; WEBSTER JRP;
Indirizzi:
AUSTRALIAN NATL UNIV CANBERRA ACT 0200 AUSTRALIA AUSTRALIAN NATL UNIV CANBERRA ACT 0200 AUSTRALIA RUTHERFORD APPLETON LAB,ISIS FACIL DIDCOT OX11 0QX OXON ENGLAND
Titolo Testata:
Journal of physical chemistry
fascicolo: 23, volume: 98, anno: 1994,
pagine: 5935 - 5942
SICI:
0022-3654(1994)98:23<5935:SAONRO>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-DIFFRACTION; CHAIN FATTY-ACIDS; INSOLUBLE MONOLAYERS; PENTADECANOIC ACID; SCATTERING; POLYMER; LAYERS; FILMS; TRANSITIONS; MICROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
55
Recensione:
Indirizzi per estratti:
Citazione:
P.M. Saville et al., "SPECULAR AND OFF-SPECULAR NEUTRON REFLECTIVITY OF A LOW-MOLECULAR-WEIGHT POLYSTYRENE SURFACTANT AT THE AIR-WATER-INTERFACE", Journal of physical chemistry, 98(23), 1994, pp. 5935-5942

Abstract

Neutron reflectivity measurements were made on films at the air-waterinterface of a highly characterized low molecular weight polystyrene surfactant, with a single hydroxyl end group. The II-A isotherm is consistent with collapse of a classical fluid surfactant monolayer to a trilayer structure at high compressions. Before the collapse point, reflectivity measurements indicated a decrease in the average tilt angle of the molecules to the surface normal as the layer was compressed. After the collapse point, the film structure was time dependent and was best represented by a monolayer of constant thickness at the water interface, covered by a bilayer whose thickness increased with time and atime-dependent diffuse layer above the bilayer. Multidetector reflectivity profiles showed only specular reflection for surface pressures below the collapse point, but in the collapse region, some off-specularreflection was clearly present, indicating the presence of surface texture on the micron length scale in the plane of the interface. This is believed to be the first observation of well-developed off-specular neutron reflection from a Langmuir film.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 06:02:39