Ultrathin films of perfluoropolyether-grafted polysiloxanes chemisorbed via alkylthiolate anchors to gold surfaces

Wang, W.; Castner, David G.; Grainger, David W.

doi:10.1016/s0968-5677(97)88378-2

Cited by 18 publications

(19 citation statements)

References 26 publications

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“…In this configuration the dendrimer serves as a “nanofilter” that passes small or suitably charged molecular species but prevents other molecules from interacting with the colloid. Thus, both planar and colloidal Au coated with dendrimers have unique properties that make them well-suited for some specific applications of chemical sensors and catalysis that require a metal to be coated with a permselective organic shell. , It is the combination of well-defined structure and controlled permeability that makes dendrimers more attractive for preparing monolayers on gold for some applications than the thiol-modified linear polymers described earlier …”

Section: Introductionmentioning

confidence: 99%

Monolayers of Thiol-Terminated Dendrimers on the Surface of Planar and Colloidal Gold

1999

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The synthesis of fourth-generation poly(amido−amine) (PAMAM) dendrimers having terminal groups partially or fully functionalized with thiol groups is described. These thiolated dendrimers form stable monolayers on planar Au substrates. X-ray photoelectron spectroscopy studies reveal that most of the thiol groups on dendrimers having 20% of their terminal primary amine groups functionalized can directly interact with the Au surface. This suggests that the dendrimer molecules are flexible and arrange themselves so as to maximize the number of Au/thiol interactions. Reduction of tetrachloroauric acid in the presence of thiol-modified dendrimers results in formation of water-soluble, dendrimer-stabilized nanoparticles. The particles are 1.5−2.1 nm in diameter depending on the Au/dendrimer ratio used. Stable nanoparticles can be obtained at Au/dendrimer ratios as large as 120:1.

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Section: Introductionmentioning

confidence: 99%

Monolayers of Thiol-Terminated Dendrimers on the Surface of Planar and Colloidal Gold

1999

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“…While in situ film polymerization has been pursued using a wide variety of strategies, prepolymerized directed chemisorption or covalent assembly of macromolecules as thin film structures on surfaces is less studied. Examples, to date, include the early work by Stouffer and McCarthy using polystyrene copolymers containing thiol anchoring groups on gold, polyacrylate monolayer films on gold, , polysiloxane graft copolymers on gold, redox-active polymer surface attachment, and polyoxazoline surface grafting to oxide solids …”

Section: Introductionmentioning

confidence: 99%

Polymer Immobilization to Alkylchlorosilane Organic Monolayer Films Using Sequential Derivatization Reactions

1997

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Covalent immobilization of hydrophobic and hydrophilic polymers in sequential reactions to surfaces of olefin-terminated alkylsilane monolayers results in fabrication of polymermodified ultrathin films. Film surface chemistry and interfacial energy are modified significantly using this approach, resulting from sandwich-type layers bearing pendant poly-(ethylene glycol) or perfluoroalkyl chains exposed on the film surface. Photoaddition chemistry has been used to react a thiol-bearing polysiloxane to olefin-terminated alkylsilane monolayers. Additionally, hydrosilylation reactions have also been used to covalently attach Si-H polysiloxanes to olefin-terminated alkylsilane monolayers. XPS and static SIMS have been used to confirm chemistry and yields after these sequential immobilization reactions. Both surface analysis methods provide evidence for the surface chemistry of each immobilization step at the surface.

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“…A product of Solvay S.A. called Fluorolink S10 is commercially available. Other products containing silane and siloxane end groups can be found due to the interesting properties of the silicon atom in the literature or under patents via amide bonds which provided the triethoxysiloxane end group for sol–gel procedures. − An example of applications for the amidation reaction was proposed by Patrick et al, who used it to bond PFPAE with cyanine. Then, nanoemulsions were created to make possible the cellular pH measurements in living cells by fluorescent microscopy and flow cytometry .…”

Section: Condensation Reactionsmentioning

confidence: 99%

Diversity of Synthetic Approaches to Functionalized Perfluoropolyalkylether Polymers

et al. 2021

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Perfluoropolyalkylethers (PFPAEs) are a class of fluorinated polymers having −OCF2–, −OCF2CF2–, and −OCF2CF(CF3)– as common chain units. The ether linkages distinguish them from other famous fluorinated polymers such as poly(tetrafluoroethylene). Their higher mobility highlighted by below zero glass transition temperatures permit them to be noncrystalline, which makes them easy to use for many applications. They possess interesting tribological properties, combined with an excellent thermal and chemical stability, make them very useful as lubricants. However, after chemical modifications, they also demonstrated to be very useful in numerous applications as surfactants, electrolytes, high performance coatings, vitrimers, or microfluidic devices, to give a few examples. This Perspective aims to summarize all the chemical modifications reported on these PFPAEs to provide a new insight into their potential utility in emerging fields. Indeed, the end group can modulate the properties of PFPAE-based materials such as lubricity, superhydrophobicity, biofouling, antibacterial activity, amphiphilicity, and the ability to react further with comonomers under photochemical and thermal processes. It can also modulate their intrinsic properties such as viscosity and solubility in common organic solvents. The chemical modifications are sorted in five main parts: the condensation reactions, the nucleophilic reactions, the click chemistry reactions, the radical reactions, and finally reactions going through other mechanisms or requiring a multistep process. They can be employed as such or for further polymerization processes depending on the targeted application. Examples of applications are thoroughly described to demonstrate their current usefulness and to help provide direction for their future use.

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Ultrathin films of perfluoropolyether-grafted polysiloxanes chemisorbed via alkylthiolate anchors to gold surfaces

Cited by 18 publications

References 26 publications

Monolayers of Thiol-Terminated Dendrimers on the Surface of Planar and Colloidal Gold

Monolayers of Thiol-Terminated Dendrimers on the Surface of Planar and Colloidal Gold

Polymer Immobilization to Alkylchlorosilane Organic Monolayer Films Using Sequential Derivatization Reactions

Diversity of Synthetic Approaches to Functionalized Perfluoropolyalkylether Polymers

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