Self assembled molecular monolayers on oxidized inhomogeneous aluminum surfaces

Bram, Corina; Jung, Chul Woo; Stratmann, M.

doi:10.1007/s002160050357

Cited by 63 publications

(55 citation statements)

References 1 publication

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“…Non-oriented random hydrocarbon chains exhibit a high a CH 2 / a CH 3 ratio because the C-H stretch of the methylene groups has a dipole moment in the p-plane. 11,21,22 The a CH 2 / a CH 3 ratio decreases as the alkyl chain orientation approaches the surface perpendicular, removing the a CH 2 from the p-plane. The a CH 2 / a CH 3 ratios measured for monolayers formed from alkyl phosphonic and carboxylic acids with various chain lengths are shown in Table 2 and Fig.…”

Section: Polarization Modulation Infrared Reflection-absorption Spectmentioning

confidence: 98%

Comparative study of self‐assembly of a range of monofunctional aliphatic molecules on magnetron‐sputtered aluminium

Liakos

Newman

McAlpine

et al. 2004

Surface & Interface Analysis

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The adsorption of a range of organic molecules from toluene onto the oxidized surface of magnetronsputtered aluminium metal is studied using sessile drop water contact angle measurements. Molecules with different head group functionalities and various chain lengths are considered, including alkyl carboxylic acids, alkyl phosphonic acids, alkyl amines, alkyl trimethoxysilanes, alkyl trichlorosilanes and epoxy alkanes. Alkyl phosphonic and carboxylic acids are identified as readily forming the most wellpacked monolayers on the aluminium surface, whereas the others adsorb less well and the chlorosilanes polymerize as a result of combination with moisture to form a thick deposit. The high-adsorption-density monolayers of alkyl phosphonic and carboxylic acids were studied using polarization modulation infrared reflection-absorption spectroscopy (PM-IRRAS) and x-ray photoelectron spectroscopy (XPS): PM-IRRAS reveals relatively poorer ordering of the C 10 alkyl carboxylic acid monolayer compared with that formed from the phosphonic acid, and XPS data suggest that this is likely to relate to a lower ability to displace preadsorbed volatile organic compounds.

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Section: Polarization Modulation Infrared Reflection-absorption Spectmentioning

confidence: 98%

Comparative study of self‐assembly of a range of monofunctional aliphatic molecules on magnetron‐sputtered aluminium

Liakos

Newman

McAlpine

et al. 2004

Surface & Interface Analysis

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“…Alkanephosphonic acids are used to enhance adhesion properties of the surface of substrates as diverse as steel, [40] aluminum, [41][42][43][44][45] or titanium. [46][47][48] It may be that the phosphonic acids react with the metal surface native oxide layer [49] by hydrogen bonding [41,50,51] leading to a resonance-stabilized phosphonated complex (tridentate coordination) ( Figure 5), or by proton transfer (possibly reversible), [52] as proposed for carboxylic acids.…”

Section: Coating and Tests Of Terpolymersmentioning

confidence: 99%

Migration of Additives in Polymer Coatings: Phosphonated Additives and Poly(vinylidene chloride)‐Based Matrix

Rixens

Severac²,

Boutevin

et al. 2005

Macro Chemistry & Physics

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Summary: The living radical terpolymerization of vinylidene chloride (VC2), methyl acrylate (MA), and dimethyl‐2‐methacryloxyethylphosphonate (MAPHOS) was performed at 70 °C in benzene by a reversible addition fragmentation chain transfer (RAFT) process to yield a gradient terpolymer of controlled molecular weight ($\overline M _{\rm n}$ = 5 800 g · mol−1, Ip = 1.53) with a molar composition of 75:14:11 (VC2/MA/MAPHOS). Such terpolymers, hydrolyzed (phosphonic acid groups) or not, were used as polymeric additives in coating formulations based on a poly(VC2‐co‐MA) copolymer matrix ($\overline M _{\rm n}$ = 63 300 g · mol−1, Ip = 1.99, VC2/MA = 80:20 molar ratio). The formulations were spun cast on stainless steel surfaces and the coatings were observed by scanning electron microscopy (SEM) coupled with X‐ray analyses (EDX). The hydrolyzed additive was shown to both segregate and migrate towards the metal interface, leading to a preferential organization of the coating. Hence, the matrix at the air surface acts as a barrier to gas while the additive ensures adhesion at the polymer/metal interface.SEM photograph of a section of the coating with formulation 4 [poly(VC2‐co‐MA‐co‐MAPHOS(OH)2) (75:14:11)].magnified imageSEM photograph of a section of the coating with formulation 4 [poly(VC2‐co‐MA‐co‐MAPHOS(OH)2) (75:14:11)].

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“…Previously, Auger electron spectroscopy (AES) has been used to reveal preferential adsorption of alkyl phosphonic acid to submicron iron-containing inclusions in an aluminium alloy (AlMg1). 8 Here, the information that may be obtained from imaging XPS is explored. The effect on the uniformity of SAM formation of intermetallic particles intersecting the surface is reported.…”

Section: Introductionmentioning

confidence: 99%

Imaging XPS investigation of the lateral distribution of copper inclusions at the abraded surface of 2024T3 aluminium alloy and adsorption of decyl phosphonic acid

Roberts¹,

Engelberg

Liu

et al. 2002

Surface & Interface Analysis

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The XPS images of copper-rich intermetallic particles in an aluminium alloy have been obtained after argon ion removal of the oxide at the surface of mechanically polished 2024T3 alloy. Comparison of the XPS analysis before and after etching indicates that the oxide does not include significant concentrations of copper. Through analogy with copper incorporation into anodic films, it is proposed that incorporation into the oxide would only occur after preferential oxidation of aluminium and enrichment of copper immediately below the oxide film.Self-assembling monolayers of decyl phosphonic acid (DPA) have been adsorbed to the surface of 2024T3 alloy and superpure Al. The lateral distribution was mapped with XPS using the characteristic P 2s signal. The distribution of DPA was relatively uniform on both MS-Al and 2024T3. This is consistent with the model of the alloy surface constructed from the imaging XPS analysis, which suggests that the oxide on the large particles is close in composition to that on to the surrounding matrix.

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Self assembled molecular monolayers on oxidized inhomogeneous aluminum surfaces

Cited by 63 publications

References 1 publication

Comparative study of self‐assembly of a range of monofunctional aliphatic molecules on magnetron‐sputtered aluminium

Comparative study of self‐assembly of a range of monofunctional aliphatic molecules on magnetron‐sputtered aluminium

Migration of Additives in Polymer Coatings: Phosphonated Additives and Poly(vinylidene chloride)‐Based Matrix

Imaging XPS investigation of the lateral distribution of copper inclusions at the abraded surface of 2024T3 aluminium alloy and adsorption of decyl phosphonic acid

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