Self-assembled monolayer and multilayer thin films on aluminum 2024-T3 substrates and their corrosion resistance study

Wang, Duhua; Ni, Yuhua; Huo, Qun; Tallman, Dennis E.

doi:10.1016/j.tsf.2004.06.158

Cited by 64 publications

(63 citation statements)

References 13 publications

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“…In some cases the surfaces were then rendered hydrophobic via covalent functionalization with OTS by immersion in freshly prepared solutions of OTS in hexadecane at a concentration of 1 mM for 1 h and subsequent rinsing in hexadecane and ethanol. This treatment resulted in water surface contact angles of >100°, in agreement with earlier studies dealing with the OTS functionalization of aluminum oxide surfaces (40). Single and double lipid monolayers on the surface of the multilayer substrates were prepared using the LB and/or LS transfer methods.…”

Section: Methodssupporting

confidence: 87%

Atom-scale depth localization of biologically important chemical elements in molecular layers

Schneck

Scoppola

Drnec

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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In nature, biomolecules are often organized as functional thin layers in interfacial architectures, the most prominent examples being biological membranes. Biomolecular layers play also important roles in context with biotechnological surfaces, for instance, when they are the result of adsorption processes. For the understanding of many biological or biotechnologically relevant phenomena, detailed structural insight into the involved biomolecular layers is required. Here, we use standing-wave X-ray fluorescence (SWXF) to localize chemical elements in solid-supported lipid and protein layers with near-Ångstrom precision. The technique complements traditional specular reflectometry experiments that merely yield the layers' global density profiles. While earlier work mostly focused on relatively heavy elements, typically metal ions, we show that it is also possible to determine the position of the comparatively light elements S and P, which are found in the most abundant classes of biomolecules and are therefore particularly important. With that, we overcome the need of artificial heavy atom labels, the main obstacle to a broader application of high-resolution SWXF in the fields of biology and soft matter. This work may thus constitute the basis for the label-free, element-specific structural investigation of complex biomolecular layers and biological surfaces.surfaces | interfaces | lipid membranes | protein adsorption | X-ray scattering N anometric biomolecular layers in interfacial geometries are key components of biological matter. Biological membranes, for example, are 2D molecular structures composed mainly of lipids and proteins in an aqueous environment (1, 2). Interfacial biomolecular layers are also important from a biotechnological perspective, where surfaces are often designed to selectively promote or prevent the adsorption of bio(macro)molecules from solution (3). To investigate the diverse behavior of biomolecules at interfaces, well-defined planar model systems of biological and biotechnologically relevant interfaces have been established (4, 5). Processes involving biomolecules at interfaces are typically accompanied by a spatial reorganization of molecules, changes in molecular conformations, or the adsorption of molecules in a chemically heterogeneous environment (6). Structural insight on the nanometer scale is therefore of paramount importance.X-ray and neutron scattering are uniquely suited for the structural investigation of biomolecular systems. Specular reflectometry reveals matter density profiles perpendicular to a planar interface. However, it is generally difficult to elucidate molecular conformations and elemental distributions from such "global" density profiles. In contrast, standing-wave X-ray fluorescence (SWXF) allows determining element-specific density profiles across an interface. The SWXF technique is based on the elementcharacteristic fluorescence induced by a standing X-ray wave. The latter is formed by interference of the incident and reflected waves and its shape depends o...

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Section: Methodssupporting

confidence: 87%

Atom-scale depth localization of biologically important chemical elements in molecular layers

Schneck

Scoppola

Drnec

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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“…The aqueous salt solutions may permeate through this layer, but with greater difficulty than in the other cases mentioned. On the other hand, the contact angles of the panels modified by ODTMS [144]. In contrast to the above silane-modified samples, the contact angle of a CisSiMeiCl-modified AI surface is extremely small (-40°).…”

Section: Anticorrosive Action Via Long Aliphatic Chain Silanesmentioning

confidence: 81%

“…Some of the most common alloys, together with their chemical composition are listed below in Table.3. [144]. Since second-phase intermetallic particles including copper, zinc, and manganese, having more negative corrosion potential than Al, always precipitate during solidification in Al alloys, the accelerated galvanic corrosion is triggered at this point.…”

Section: Aluminium and Aluminium Alloysmentioning

confidence: 99%

“…There are examples of SAM application to the surface of a hydroxylated polymer or to hydrophilic metal oxide surfaces [12]. The complex surface chemistry of metal alloys is certain to have a certain number of significant effects on the self-assembling process and the properties of the resulting thin films [144]. Self-assembled monolayers, often made from amphiphilic hydrocarbon molecules, are expected to function as a barrier against the permeation of corrosion accelerants such as moisture and electrolytes into the metal substrate, thereby improving the corrosion resistance of the substrate materials [144].…”

Section: Anticorrosive Action Via Long Aliphatic Chain Silanesmentioning

confidence: 99%

“…The complex surface chemistry of metal alloys is certain to have a certain number of significant effects on the self-assembling process and the properties of the resulting thin films [144]. Self-assembled monolayers, often made from amphiphilic hydrocarbon molecules, are expected to function as a barrier against the permeation of corrosion accelerants such as moisture and electrolytes into the metal substrate, thereby improving the corrosion resistance of the substrate materials [144]. The presence of a sufficiently long aliphatic chain in the base silane molecule affords satisfactory and continuous protective properties to the coating.…”

Section: Anticorrosive Action Via Long Aliphatic Chain Silanesmentioning

confidence: 99%

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Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

Farhadi¹

2010

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Ice and wet-snow accretion on outdoor structures, including power transmission and distribution equipment, is a serious problem for regions experiencing icing conditions.Various de-icing and anti-icing techniques have been developed to date to counter this problem. Most of the techniques currently in use, however, including active de-icing methods, are employed only where accumulations are substantial. Passive approaches to the problem such as anti-icing or icephobic coatings which inhibit or retard ice accumulation on the surfaces are gaining in popularity.Metal corrosion should also be taken into account since metal or metallic alloys are subject to corrosion problems when placed in a humid or aggressive environment; the development of any ice-releasing coatings on Al structures, as they must be durable enough, is thus closely related to anti-corrosive protection of that specific metal.Consequently, this research has made an attempt to prepare coatings, either one layer or multi-layer, for use on polished AA6061 and AA2024 substrates combining the qualities of reduced ice adhesion and improved corrosion resistance. These two alloys are among the most widely used aluminium alloys in transportation systems (including aircraft), electric power industry, military, etc. Both the stability of the coatings in a humid environment and their overall ice-repellent performance was systematically studied.This research work has made a systematic approach to investigating the influence of surface roughness on the ice-releasing potential and the hydrophobic properties of the prepared coating surfaces. All coatings displayed a gradual loss of their hydrophobic properties after ~ 1000 h of immersion in water, and while corrosion of surfaces was also observed, except in the case of surfaces treated with permanganate conversion coatings which provided satisfactory anti-corrosive protection. IllAll flat coated surfaces demonstrated shear stress of ice detachment values which were at least ~ 1.5 times lower than uncoated mirror-polished Al surfaces and about ~ 2 times lower than those observed on as-received Al surfaces. The adhesion reduction factor (ARF) values decreased after as many as 12 icing/de-icing events, implying a certain amount of decay of the coatings.All rough superhydrophobic samples allowed for ice adhesion shear stress values of at least ~ 4 to 7 times lower than those obtained on the uncoated as-received Al surfaces. After 24 icing/de-icing experiments, however, ice adhesion strength increased significantly on those surfaces by a factor of ~ 2 after 24 icing/de-icing cycles.In addition, all flat and rough-coated surfaces gradually lost their hydrophobic properties after nearly each icing/de-icing cycle. Thus, the ice-releasing ability of all samples tested was found to be time-dependent.The work thus reveals that it is possible to prepare coatings which provide the reduced adhesion of ice to Al surfaces, while at the same time also providing some degree of anticorrosive protection.

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Advances and Properties of Silanol‐Based Materials

Pietschnig

2017

Main Group Strategies Towards Functional Hybrid Materials

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Self-assembled monolayer and multilayer thin films on aluminum 2024-T3 substrates and their corrosion resistance study

Cited by 64 publications

References 13 publications

Atom-scale depth localization of biologically important chemical elements in molecular layers

Atom-scale depth localization of biologically important chemical elements in molecular layers

Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

Advances and Properties of Silanol‐Based Materials

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