Packing of Hydrocarbon and Perfluorocarbon Chains Planted on Oxidized Surface of Silicon As Studied by Ellipsometry and Atomic Force Microscopy

Fujii, Masatoshi; Sugisawa, S.; Fukada, Kazuhiro; Kato, Tadashi; Shirakawa, Toshiaki; Seimiya, Tsutomu

doi:10.1021/la00016a002

Cited by 34 publications

(33 citation statements)

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“…22 Even in air, crystalline structures have been observed for ArAc tails 6 and OTS on silica. 23 The larger size of the DPPC head group will geometrically obstruct a close packing, and to our knowledge no crystalline structure has been reported for DPPC tails. Although crystalline structures of OTS and ArAc tails are observed, all alkyl chains in the monolayers have cross-sectional areas which allow them some rotational freedom in the transferred films 24 as well as considerable chain flexibility.…”

Section: Adsorption and Desorption Kineticsmentioning

confidence: 87%

Human Growth Hormone Adsorption Kinetics and Conformation on Self-Assembled Monolayers

1998

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The adsorption process of the recombinant human growth hormone on organic films, created by self-assembly of octadecyltrichlorosilane, arachidic acid, and dipalmitoylphosphatidylcholine, is investigated and compared to adsorption on silica and methylated silica substrates. Information on the adsorption process of human growth hormone (hGH) is obtained by using total internal reflection fluorescence (TIRF). The intensity, spectra, and quenching of the intrinsic fluorescence emitted by the growth hormone's single tryptophan are monitored and related to adsorption kinetics and protein conformation. For the various alkylated hydrophobic surfaces with differences in surface density and conformational freedom it is observed that the adsorbed amount of growth hormone is relatively large if the alkyl chains are in an ordered structure while the amounts adsorbed are considerably lower for adsorption onto less ordered alkyl chains of fatty acid and phospholipid layers. Adsorption on methylated surfaces results in a relatively large conformational change in the growth hormone's structure, as displayed by a 7 nm blue shift in emission wavelength and a large increase in the effectiveness of fluorescence quenching. Conformational changes are less evident for hGH adsorption onto the fatty acid and phospholipid alkyl chains. Adsorption kinetics on the hydrophilic head groups of the self-assembled monolayers are similar to those on solid hydrophilic surfaces. The relatively small conformational changes in the hGH structure observed for adsorption on silica are even further reduced for adsorption on fatty acid head groups.

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Section: Adsorption and Desorption Kineticsmentioning

confidence: 87%

Human Growth Hormone Adsorption Kinetics and Conformation on Self-Assembled Monolayers

1998

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“…For instance, organosilanes with long alkyl chains typically have less area per molecule than 0.5 nm 2 . 44,45 Even if the area per molecule for APTMS is 0.5 nm 2 for the condition in which the glass surface is saturated by APTMS, the distance between APTMS molecules at the surface does not exceed the diameter for 30 nm nanoparticles when qAPTMS = 0.79. Therefore, the adsorption sites for Au nanoparticles on the surface with APTMS were maintained at qAPTMS = 0.79 compared to qAPTMS = 1.0.…”

Section: Modulation Of Au Nanoparticle Deposition By Organosilanesmentioning

confidence: 99%

Gold Nanoparticle Monolayer Formation on a Chemically Modified Glass Surface

2009

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Physicochemical analyses of Au nanoparticle monolayer formation on a glass surface functionalized with 3-aminopropyltrimethoxysilane (APTMS) and ethyltrimethoxysilane (ETMS) were performed for fabricating a nanoarchitecture of metal nanoparticles using self-assembly. The Au nanoparticle surface density on the functionalized glass surface correlated linearly with the optical response because of Au-nanoparticle localized surface plasmon resonance (LSPR). This relation enabled assessment of the Au nanoparticle deposition. A Frumkin isotherm showed the deposition of Au nanoparticles on the APTMS or APTMS/ETMS functionalized glass surface. For an APTMS-derivatized surface, the affinity between the Au nanoparticles and the surface decreased with the lowering of the APTMS surface coverage. The interaction parameter exhibited attractive interaction of 30-nm-diameter Au nanoparticles; 12 nm particles were repulsive. Adsorption isotherm experiments using Au nanoparticles on glass surfaces with an APTMS and ETMS mixed layer suggest that hydrophobic interaction between Au nanoparticles' bare gold surfaces caused the attractive interaction among 30-nm-diameter nanoparticles.

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“…In general, anhydrous solutions yielded adsorption by individual molecules or small physical aggregates which coalesced and densified into monolayer islands on the substrate surface. These islands were found to grow in size and number with dipping time, and in at least one study (16), a complete ordered monolayer was ultimately formed. In contrast, films formed from water-containing solutions consisted of islands of irregular or fractal boundaries.…”

Section: Introductionmentioning

confidence: 95%

“…Several investigators have examined the structure of films formed by adsorption from both hydrous and anhydrous solutions of octadecyltrichlorosilane and closely related compounds on mica (14,15), silica (16)(17)(18)(19) and more recently glass (20) surfaces. The techniques of atomic force microscopy (AFM) (14)(15)(16)(17)(18)(19)(20), ellipsometry (15)(16)(17)(18)(19), angle-dependent X-ray photoelectron spectroscopy (XPS) (21), and Fourier transform infrared spectroscopy (FTIR) (15,19,20) were used in these studies to determine the thickness and morphology of the films as well as their refractive index and molecular conformation.…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution of Octyltriethoxysilane Films on Glass Surfaces during Annealing at Elevated Temperature

Sun¹,

Aston²,

Berg³

2002

Journal of Colloid and Interface Science

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Packing of Hydrocarbon and Perfluorocarbon Chains Planted on Oxidized Surface of Silicon As Studied by Ellipsometry and Atomic Force Microscopy

Cited by 34 publications

References 0 publications

Human Growth Hormone Adsorption Kinetics and Conformation on Self-Assembled Monolayers

Human Growth Hormone Adsorption Kinetics and Conformation on Self-Assembled Monolayers

Gold Nanoparticle Monolayer Formation on a Chemically Modified Glass Surface

Structural Evolution of Octyltriethoxysilane Films on Glass Surfaces during Annealing at Elevated Temperature

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