Polymer Anchoring Layer for Atomic Force Microscopy Studies of Nanoparticle–Substrate Interactions

Burtovyy, Ruslan; Liu, Yong; Luzinov, Igor; Zdyrko, Bogdan; Tregub, Alex; Moinpour, Mansour; Buehler, Markus J.

doi:10.1080/00222340601044466

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…In comparison with P2VP anchoring to the wafers, we introduced one additional step, grafting of P2VP from solution at 60 °C for 48 h. It was necessary to avoid cross-linking between the PGMA-RhB nanoparticles dispersed in P2VP melt. Without this procedure, the particles aggregate as THF is evaporated due to the immiscibility between P2VP and PGMA . Since the PGMA-covered particles are in contact, the epoxy groups from neighboring particles can react with each other and cross-link the aggregate at 110 °C.…”

Section: Resultsmentioning

confidence: 99%

Fluorescent Nanoparticles Stabilized by Poly(ethylene glycol) Containing Shell for pH-Triggered Tunable Aggregation in Aqueous Environment

et al. 2010

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Fluorescent silica nanoparticles decorated with a responsive shell, a mixed polymer brush, were synthesized. Specifically, a poly(2-vinylpyridine), P2VP, and poly(ethylene glycol), PEG, binary polymer brush was synthesized on silica nanoparticles via the "grafting to" technique. The selection of the components (PEG and P2VP) for the responsive brush shell was motivated by potential biomedical applications. Poly(glycidyl methacrylate), PGMA, labeled with Rhodamine B, RhB, was used to form a reactive and fluorescent shell on the nanoparticle surface. The interaction between the particles themselves and the particles and their environment can be precisely tuned by a change in pH. At lower pH, aqueous dispersions of the particles are stable, since PEG and P2VP are water-soluble, extended and contribute to the steric and electrostatic mechanisms of colloidal stability. An increase of pH to 6 causes a slow aggregation as a consequence of the hydrophobic attraction between the collapsed and almost nonprotonated P2VP macromolecules. The aggregation was well controlled and occurred within 90-120 min of the pH change. The aggregation was fully reversible after the decrease in pH. The pH variation did not quench the fluorescence of the colloidal suspensions. The pH-tunable aggregation of the fluorescent nanoparticles could find diverse applications for labeling and contrasting of cells and tissues when the size of the label and the intensity of the optical signals can be tuned by and related to the pH of the host environment.

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Section: Resultsmentioning

confidence: 99%

Fluorescent Nanoparticles Stabilized by Poly(ethylene glycol) Containing Shell for pH-Triggered Tunable Aggregation in Aqueous Environment

et al. 2010

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“…The stability of thin PVP films on silicon oxide substrate has not been considered to date because they generally are very easy to prepare (by dip-coating, spin-coating, or adsorption) and are considered to be stable. Recently, however, we observed spontaneous dewetting of PVP thin films deposited on a silicon surface with a native oxide layer in a basic aqueous solution . A remarkable peculiarity of the observed phenomenon is the polymer’s lack of solubility under these conditions.…”

Section: Introductionmentioning

confidence: 98%

“…Recently, however, we observed spontaneous dewetting of PVP thin films deposited on a silicon surface with a native oxide layer in a basic aqueous solution. 21 A remarkable peculiarity of the observed phenomenon is the polymer's lack of solubility under these conditions. This article reports on the detailed investigation of stability and dewetting of PVP.…”

Section: Introductionmentioning

confidence: 99%

Reversibility of pH-Induced Dewetting of Poly(vinyl pyridine) Thin Films on Silicon Oxide Substrate

Burtovyy

Luzinov

2008

Langmuir

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Thin PVP films deposited on a silicon oxide surface have been found to form a dewetting pattern when treated with basic solutions (pH > or = 10). We studied the dependence of pattern morphology on the polymer's molecular weight and thickness of the polymer layer, and observed the formation of three distinctive structures. The structure formed by large drops of polymer is characteristic of a polymer with low molecular weight and the thinnest polymer layer, whereas other samples form holes or a weblike pattern upon dewetting. These experiments have demonstrated for the first time the reversibility of the dewetting process in a liquid environment. The polymer layer has revealed reversible behavior toward flat film when exposed to a pH 4 buffer solution. More complex structures can be obtained by consecutive treatments with acidic (pH 4) and basic (pH 10) solutions. We used atomic force microscopy (AFM) to study both the morphology and elastic properties of polymers in media with different acidity, in order to determine the mechanism behind the dewetting process.

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Polymer Anchoring Layer for Atomic Force Microscopy Studies of Nanoparticle–Substrate Interactions

Cited by 2 publications

References 17 publications

Fluorescent Nanoparticles Stabilized by Poly(ethylene glycol) Containing Shell for pH-Triggered Tunable Aggregation in Aqueous Environment

Fluorescent Nanoparticles Stabilized by Poly(ethylene glycol) Containing Shell for pH-Triggered Tunable Aggregation in Aqueous Environment

Reversibility of pH-Induced Dewetting of Poly(vinyl pyridine) Thin Films on Silicon Oxide Substrate

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