Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
CHAIN-LENGTH DEPENDENCE OF THE STRUCTURE AND WETTING PROPERTIES IN BINARY COMPOSITION MONOLAYERS OF OH-TERMINATED AND CH3-TERMINATED ALKANETHIOLATES ON GOLD
Autore:
ATRE SV; LIEDBERG B; ALLARA DL;
Indirizzi:
PENN STATE UNIV,DEPT MAT SCI & ENGN UNIVERSITY PK PA 16802 PENN STATE UNIV,DEPT MAT SCI & ENGN UNIVERSITY PK PA 16802 PENN STATE UNIV,DEPT CHEM UNIVERSITY PK PA 16802 LINKOPING UNIV,APPL PHYS LAB S-58183 LINKOPING SWEDEN
Titolo Testata:
Langmuir
fascicolo: 10, volume: 11, anno: 1995,
pagine: 3882 - 3893
SICI:
0743-7463(1995)11:10<3882:CDOTSA>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELF-ASSEMBLED MONOLAYERS; SCANNING-TUNNELING-MICROSCOPY; ORGANIZED MOLECULAR ASSEMBLIES; ENERGY HELIUM DIFFRACTION; OXIDIZED ALUMINUM SURFACE; NORMAL-ALKANOIC ACIDS; NORMAL-ALKYL CHAINS; H STRETCHING MODES; MIXED MONOLAYERS; CONTACT-ANGLE;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
112
Recensione:
Indirizzi per estratti:
Citazione:
S.V. Atre et al., "CHAIN-LENGTH DEPENDENCE OF THE STRUCTURE AND WETTING PROPERTIES IN BINARY COMPOSITION MONOLAYERS OF OH-TERMINATED AND CH3-TERMINATED ALKANETHIOLATES ON GOLD", Langmuir, 11(10), 1995, pp. 3882-3893

Abstract

Equimolar, binary-component, self-assembled monolayers (SAMs) of -S(CH2)(15)CH2OH and -S(CH2)((15+m))-CH3, with m varied systematically from -6 to +6, were prepared on evaporated gold films by self-assembly from ethanol solutions of the corresponding thiols. Single-wavelength ellipsometry, X-ray photoelectron spectroscopy, and infrared reflection spectroscopy (IRS) were used to monitor the coverage, composition, andchain conformational order, respectively, in the air/SAM structures, while liquid drop contact angle measurements with hydrogen-bonding andhydrocarbon liquids were used to probe the structural and chemical characteristics at the liquid/SAM interface. Both the IRS C-H stretchingmode characteristics and the hydrocarbon liquid contact angles show sharp changes as m increases through the region of -4 to 0, while the hydrogen-bonding liquid contact angles remain essentially constant across the range of m values. The combined data lead to a general structural model in which monolayer structures shift from randomly placed, protruding HO-terminated chain segments which screen the underlying CH3 surface at low m to contiguously placed, protruding CH3-terminated chains, organized in clusters and extending away from the underlying CH2OHsurface at high m. These structures require that the monolayers approach random mixing at low m but be phase-segregated at high m.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 00:10:08