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This work looks at thin films and self-assembled monolayers of thiols. It is aimed at researchers in chemistry, materials science, electrical engineering, biology and condensed matter physics.
Self-assembled monolayers (SAMs) generated from adsorption of the single-chained cholesterol-based and unsymmetrical double-chained cholesterol-based thiols on gold substrates were examined. The single-chained cholesterol-based thiols have a thiol headgroup, hydrocarbon spacer consisting of 3 – 12 methylene units, and a cholesterol tailgroup. The double-chained cholesterol-based thiols consist of a thiol headgroup and two tailgroups: an alkyl chain and a cholesterol-based moiety. Two series of single-component SAMs were formed from the cholesterol-based thiols. Analysis of the pure SAM shows that the added methylene spacer for the single-chained thiols allows for the formation of a better monolayer than that formed from thiocholesterol. The pure SAMs formed from the double-chained cholesterol-based thiols also produce a monolayer that is denser than the SAM generated from thiocholesterol, with interfacial properties resembling a SAM formed from normal alkanethiols. A series of binary SAMs generated from the single-chained cholesterol-based thiols and n-octadecanethiol exhibit properties of the cholesterol condensing effect. The SAMs were characterized using ellipsometry, contact angle goniometry, polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), and X-ray photoelectron spectroscopy (XPS). Overall, these cholesterol-based adsorbates were used to generate dense monolayers despite a mixed composition of cholesterol moieties and trans-extended alkyl chains. The cholesterol condensing effect was observed in self-assembled monolayers for the first time.
This is the first ever comprehensive treatment of NEXAFS spectroscopy. It is suitable for novice researchers as an introduction to the field, while experts will welcome the detailed description of state-of-the-art instrumentation and analysis techniques, along with the latest experimental and theoretical results.
Ordered, organic monolayers were formed on gold slides by adsorption from ethanol of HS(CH2)10CH2OH, HS(CH2)10CH3, S(CH2)10CH2OH2, S(CH2)10Ch32, and of binary mixtures of these molecules in which one component was terminated by a hydrophobic methyl group and one by a hydrophilic alcohol group. The compositions of the monolayers were determined by X-ray photoelectron spectroscopy (XPS). Wettability was used as a probe of the chemical composition and structure of the surface of the monolayer. When monolayers were formed in solutions containing mixtures of a thiol and a disulfide, adsorption of the thiol was strongly preferred (approx. 75:1). Monolayer, Gold, Surface, Contact angles, Thiols, Disulfides. (mjm).
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