A surface analytical and an electrochemical study of iron surfaces modified by thiols

Volmer‐Uebing, M.; Stratmann, M.

doi:10.1016/0169-4332(92)90377-a

Cited by 90 publications

(46 citation statements)

References 9 publications

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“…The four sorbent nanoparticles that contain thiol functional groups display a S 2p peak at 163.5 eV, a band position consistent with free thiols. [41,42] The intensity of this peak is the greatest for Fe 3 O 4 -DMSA with its di-thiol structure, followed by 4-mercaptobutyric acid, glutathione, and the barely detected S 2p for the PEG-SH nanoparticles (see the Supporting Information for intensity values). The small intensity of the PEG-SH S 2p peak could be attributed to the decreased packing density owing to steric crowding of the long PEG chains on the surface of the magnetic nanoparticle.…”

mentioning

confidence: 96%

High‐Performance, Superparamagnetic, Nanoparticle‐Based Heavy Metal Sorbents for Removal of Contaminants from Natural Waters

et al. 2010

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We describe the synthesis and characterization of high-performance, superparamagnetic, iron oxide nanoparticle-based, heavy metal sorbents, which demonstrate excellent affinity for the separation of heavy metals in contaminated water systems (i.e., spiked Columbia River water). The magnetic nanoparticle sorbents were prepared from an easy-to-synthesize iron oxide precursor, followed by a simple, one-step ligand exchange reaction to introduce an affinity ligand to the nanoparticle surface that is specific to a heavy metal or class of heavy metal contaminants. The engineered magnetic nanoparticle sorbents have inherently high active surface areas, allowing for increased binding capacities. To demonstrate the performance of the nanoparticle sorbents, river water was spiked with specific metals and exposed to low concentrations of the functionalized nanoparticles. In almost all cases, the nanoparticles were found to be superior to commercially available sorbent materials as well as the unfunctionalized iron oxide nanoparticles.

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confidence: 96%

High‐Performance, Superparamagnetic, Nanoparticle‐Based Heavy Metal Sorbents for Removal of Contaminants from Natural Waters

et al. 2010

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“…Degree of substitution with phosphoric acid: 1.3 (potentiometric titration); Yield: 18.8 g (60%). 1 Hydroxypropyl-2-cinnamoylpropyl cellulose (2) [16] 2.0 g (4.52 mmol) hydroxypropyl cellulose were dissolved overnight in 100 ml DMF. 3.6 g (45 mmol) pyridine were added, and the solution was cooled to 0 8C.…”

Section: Synthesesmentioning

confidence: 99%

“…[1][2][3][4] For self-assembling molecules (SAMs), substances are required which are able to react spontaneously at the surface. For this purpose, terminated alkylphosphonic acids and phosphoric acid monoalkyl esters have been synthesised.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin layers of phosphorylated cellulose derivatives on aluminium surfaces

Kowalik

Adler²,

Plagge

et al. 2000

Macromol. Chem. Phys.

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In recent works the self‐assembly process has been investigated to replace the present chromating procedure on reactive metals like aluminium and to improve the lacquer adhesion and corrosion inhibition. These self‐assembling layers were formed of small bifunctional organic molecules with phosphate or phosphonic acid groups attached to the metal substrate. The idea of this work was to apply these results and techniques to cellulose derivatives on implant metals. The formation of ultrathin layers of phosphorylated cellulose derivatives has been reported previously. These ultrathin layers were built on metal substrates like aluminium, titanium or steel for adhesion promotion and corrosion inhibition. Hydroxypropyl‐2‐phosphatepropyl cellulose was synthesised for adhesion on hydrophilic metallic surfaces. Hydroxypropyl‐2‐cinnamoylpropylester cellulose was prepared in order to crosslink the adsorbed layers. The layers were formed on metal surfaces via dip coating from dilute solutions and characterised by means of contact angle measurements, SEM investigations and FT‐IR spectroscopy. Initial corrosion tests were performed.

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“…21,22 Interestingly, even though thiol self-organization is the playground of hundreds of scientists, until very recently nothing has been known about the influence of the electrode potential on thiol self-assembly. As could be shown, thiol monolayers proved to be excellent inhibitors of oxygen reduction and, moreover, are not easily destroyed by the radicals set free during the oxygen re duction.…”

Section: Protection Of the Interface By Surface Modificationmentioning

confidence: 99%

Surface Modification by Ordered Monolayers: New Ways of Protecting Materials Against Corrosion

Rohwerder¹,

Stratmann²

1999

MRS Bull.

Self Cite

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Metal/polymer composites are used in numerous technical applications. For example, polymer coatings on metal surfaces are used for corrosion protection, metal films on polymers inhibit static buildup, and polymers between two metals can serve as a “glue” for connecting materials that cannot be welded. Polymer/metal composites also play an important role in modern electronics. In condensers, polymers serve as insulating layers between metallic leads and are used to encapsulate entire electronic circuits. In all circumstances, interfaces are formed between the two different materials, and since the chemistry and structure change abruptly, interfacial failure is frequently observed.The cause of failure may just be mechanical (e.g., shrinkage of the polymer during curing), or the interface stability may be degraded by attack of aggressive species, resulting in delamination. More specifically, loss of adhesion is directly caused by interfacial electrochemical reactions that nucleate at a defect and progress into intact regions of the interface. This occurs for encapsulated electronic parts in humid atmospheres as well as for lacquers on automotive parts.Thus the investigation of corrosion reactions at a buried interface is an important area of research, but it is made very difficult by the fact that most electrochemical methods do not give information on localized reaction kinetics at a buried (metal/polymer) interface. This situation has changed with the invention and development of the scanning Kelvin probe (SKP). This method allows, for the first time, local analysis of reactions occurring at a buried metal/polymer interface. Based on the results obtained with the SKP, a detailed reaction model for the delamination process has been developed. This understanding has led to the development of new approaches that protect the interface from delamination. The idea is to chemically modify the interface using Afunctional molecules that promote adhesion between metal and polymer surfaces.

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A surface analytical and an electrochemical study of iron surfaces modified by thiols

Cited by 90 publications

References 9 publications

High‐Performance, Superparamagnetic, Nanoparticle‐Based Heavy Metal Sorbents for Removal of Contaminants from Natural Waters

High‐Performance, Superparamagnetic, Nanoparticle‐Based Heavy Metal Sorbents for Removal of Contaminants from Natural Waters

Ultrathin layers of phosphorylated cellulose derivatives on aluminium surfaces

Surface Modification by Ordered Monolayers: New Ways of Protecting Materials Against Corrosion

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