Creation and characterization of n-alkylthiol and n-alkylamine self-assembled monolayers on 316L stainless steel

Ruan, Chuanmin; Bayer, Thomas; Meth, Sérgio; Sukenik, Chaim N.

doi:10.1016/s0040-6090(02)00730-7

Cited by 78 publications

(65 citation statements)

References 58 publications

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“…Ellipsometric determination of the SAM thickness obtained on top of this base-layer presented a value of 2.4 nm for the monolayer as expected from an extended alkyl chain, indicative of molecules being organized approximately orthogonal to the surface. Determination of contact angles yielded a value of 117°± 2°for the advancing angle and 101°± 3°for the receding angle, also consistent with that of an extended alkyl chain monolayer [30,46]. The samples with the enhanced SiO 2 layer had SiO 2 thickness 2.6 nm (i.e., an increase of 0.5 nm in SiO 2 thickness), and the SAM obtained on top the enhanced SiO 2 layer also presented a thickness of 2.4 nm.…”

Section: Resultssupporting

confidence: 64%

Siloxane-based thin films for corrosion protection of stainless steel in chloride media

Meth

Savchenko²,

Viva

et al. 2011

J Appl Electrochem

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The corrosion protection of stainless steel (SS 316L) provided by layers of SiO 2 and by siloxane-anchored self-assembled monolayer (SAMs) was assessed by cyclic voltammetry (CV) and by potentiostatic current transient in sodium chloride media. The SAMs were composed of octadecyltrimethoxysilane anchored onto a thin (1-2 nm) layer of SiO 2 . The initial SiO 2 layer was obtained by treatment with tetraethoxyorthosilicate. Successive layers were added by applying the alkylsiloxane and then oxidatively removed by treatment using a UV-ozone cleaner. Though SAMs have been used as corrosion barriers in other contexts, it is shown that successive cycles of SAM deposition and ablation provide an extended SiO 2 thincovering layer that protects stainless steel against pitting and general corrosion.

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Section: Resultssupporting

confidence: 64%

Siloxane-based thin films for corrosion protection of stainless steel in chloride media

Meth

Savchenko²,

Viva

et al. 2011

J Appl Electrochem

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“…Since then, many different substances on different metals and alloys have been proven to be effective against corrosion. The list includes thiols [6][7][8][9][10][11][12][13][14][15][16][17][18][19], amines [12], phosphates [20], sulfates [21], thiosulfates [22], carboxylic acids [23][24][25][26][27][28][29], hydroxamic acids [29][30][31], amino acids [32][33][34], phosphonic acids [29,35], sulfonic acids [29], silane derivatives [36], as well as heterocyclic and other compounds [16,[37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Polystyrene films as barrier layers for corrosion protection of copper and copper alloys

Románszki

Datsenko

May

et al. 2014

Bioelectrochemistry

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Dip-coated polystyrene layers of sub-micrometre thickness (85-500 nm) have been applied on copper and copper alloys (aluminium brass, copper-nickel 70/30), as well as on stainless steel 304, and produced an effective barrier against corrosion and adhesion of corrosion-relevant microorganisms. According to the dynamic wettability measurements, the coatings exhibited high advancing (103°), receding (79°) and equilibrium (87°) contact angles, low contact angle hysteresis (6°) and surface free energy (31 mJ/m 2 ). The corrosion rate of copper-nickel 70/30 alloy samples in 3.5% NaCl was as low as 3.2 µm/a (44% of that of the uncoated samples), and in artificial seawater was only 0.9 µm/a (29% of that of the uncoated samples). Cell adhesion was studied by fluorescence microscopy, using monoculture of Desulfovibrio alaskensis. The coatings not only decreased the corrosion rate but markedly reduced the number of bacterial cells adhered to the coated surfaces. The PS-coating on copper gave the best result, 2×10 3 cells/cm 2 (1% of that of the uncoated control).

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“…[16][17][18][19][20][21][22][23] However, electropolished (EP) metals such as 316L stainless steel (SS) or L605 cobalt chromium alloy (CoCr) have different surface chemistry than that of the native or mechanically polished surfaces. Several studies report increased concentrations of oxygen and metallic elements compared to the as-received metal surface, specifically increased chromium and hydroxyl group concentrations and decreased iron concentration.…”

Section: Introductionmentioning

confidence: 99%

Long‐term stability of self‐assembled monolayers on electropolished L605 cobalt chromium alloy for stent applications

et al. 2011

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Commercially available drug-eluting stents have the potential to induce inflammatory and hypersensitive adverse reactions due to their polymer coating. The use of self assembled monolayers (SAMs) as an alternate drug delivery platform for stents has recently been demonstrated. In this study, the formation and stability of phosphonic acid SAMs were investigated using the material and surface preparation commonly used to make ultra-thin stent struts-electropolished L605 Cobalt Chromium (CoCr) alloy. Methyl (⁻CH₃) and carboxylic acid (⁻OOH) terminated phosphonic acid SAMs were coated on electropolished CoCr alloy using a combination of solution immersion and dip-evaporation cycle deposition methods. SAMs-coated CoCr alloy specimens were thoroughly characterized using contact angle goniometry, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). These characterizations suggested that uniform and well-ordered monolayers were coated on the electropolished CoCr alloy. The long-term physiological stability of monolayers was investigated in tris-buffered saline (TBS) at 37°C for up to 28 days. Contact angles, FTIR, XPS, and AFM suggested that both ⁻CH₃ and ⁻COOH terminated phosphonic acid SAMs desorb from electropolished CoCr alloy surfaces in a biphasic manner. A significant desorption of ⁻CH₃ and ⁻COOH terminated SAMs occurs within 1-3 days followed by a slower desorption for up to 28 days. Thus, there is a need to develop techniques that can improve the long-term stability of SAMs on electropolished CoCr alloy for stent and other biomedical applications.

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Creation and characterization of n-alkylthiol and n-alkylamine self-assembled monolayers on 316L stainless steel

Cited by 78 publications

References 58 publications

Siloxane-based thin films for corrosion protection of stainless steel in chloride media

Siloxane-based thin films for corrosion protection of stainless steel in chloride media

Polystyrene films as barrier layers for corrosion protection of copper and copper alloys

Long‐term stability of self‐assembled monolayers on electropolished L605 cobalt chromium alloy for stent applications

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