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Titolo:
Overbased detergent particles: Experimental and molecular modelling studies
Autore:
Bearchell, CA; Heyes, DM; Moreton, DJ; Taylor, SE;
Indirizzi:
Univ Surrey, Sch Phys & Chem, Dept Chem, Guildford GU2 7XH, Surrey, England Univ Surrey Guildford Surrey England GU2 7XH ord GU2 7XH, Surrey, England BP Chem Ltd, Kingston Upon Hull HU12 8DS, N Humberside, England BP Chem Ltd Kingston Upon Hull N Humberside England HU12 8DS ide, England BP Oil Technol Ctr, Sunbury On Thames TW16 7LN, Middx, England BP Oil Technol Ctr Sunbury On Thames Middx England TW16 7LN iddx, England
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 21, volume: 3, anno: 2001,
pagine: 4774 - 4783
SICI:
1463-9076(2001)3:21<4774:ODPEAM>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANGLE NEUTRON-SCATTERING; AIR-WATER-INTERFACE; LOCAL-STRUCTURE ANALYSIS; LIQUID-VAPOR INTERFACE; CALCIUM-CARBONATE; REVERSE MICELLES; NONAQUEOUS DISPERSIONS; COMPUTER-SIMULATION; LANGMUIR TROUGH; LINE TENSIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Heyes, DM Univ Surrey, Sch Phys & Chem, Dept Chem, Guildford GU2 7XH, Surrey, England Univ Surrey Guildford Surrey England GU2 7XH H, Surrey, England
Citazione:
C.A. Bearchell et al., "Overbased detergent particles: Experimental and molecular modelling studies", PHYS CHEM P, 3(21), 2001, pp. 4774-4783

Abstract

Overbased detergents (OD) are oil-soluble nanoparticles consisting of a calcium carbonate core and surfactant outer shell. They are important additives in automotive and marine engine oils. Langmuir trough (LT) and moleculardynamics (MD) simulations have been carried out to characterise the interaction between OD particles made from a range of surfactants. We also explore the factors that determine the shape of the particles, in particular by the level of overbasing (amount of calcium carbonate in the core), surfactant type and the presence of stearate co-surfactant. Clint and Taylor (J. H. Clint and S. E. Taylor, Colloids Surf., 1992, 65, 61) derived expressions for the particle size, contact angle and interparticle interaction between spherical particles at the air/water interface in a Langmuir trough surface pressure experiment. We extend this mathematical treatment to encompass themore general case of oblate and prolate ellipsoidal particles. On reinterpreting the experimental data, the derived expressions suggest that the largest deviations from spherical symmetry occur for the phenate and calixarateparticles without co-surfactant. This is supported by molecular modelling studies also reported herein. The evidence from the combined LT and MD studies is that the co-surfactant makes the particles more spherical, by disrupting any tendency of the surfactants to self-assemble in an ordered fashionaround the surface of the carbonate core.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 17:03:01