Synthesis of Nanometer-Scale Polymeric Structures on Surfaces from Template Assisted Admicellar Polymerization:  A Comparative Study with Protein Adsorption

Marquez, Maricel; Patel, Kuldeep; Carswell, Andrew; Schmidtke, David W.; Grady, Brian P.

doi:10.1021/la061108g

Cited by 20 publications

(33 citation statements)

References 68 publications

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“…This technique was used to coat various substrates with polymers like polystyrene (PS) and poly methyl methacrylate (PMMA) [42][43][44][45][46] . This coating technique was also applied to study the method of polymer coating formation on graphite and mica surfaces [47][48][49][50][51] . Chen et al had previously demonstrated that the micelle surrounding single-walled carbon nanotubes (SWNTs) could be swelled by various organic solvents 52 .…”

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confidence: 99%

Localized In situ Polymerization on Graphene Surfaces for Stabilized Graphene Dispersions

Das

Wajid

Shelburne

et al. 2011

ACS Appl. Mater. Interfaces

109

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We demonstrate a novel in situ polymerization technique to develop localized polymer coatings on the surface of dispersed pristine graphene sheets. Graphene sheets show great promise as strong, conductive fillers in polymer nanocomposites; however, difficulties in dispersion quality and interfacial strength between filler and matrix have been a persistent problem for graphene-based nanocomposites, particularly for pristine graphene. With this in mind, a physisorbed polymer layer is used to stabilize graphene sheets in solution. To create this protective layer, we formed an organic microenvironment around dispersed graphene sheets in surfactant solutions, and created a nylon 6, 10 or nylon 6, 6 coating via interfacial polymerization. Technique lies at the intersection of emulsion and admicellar polymerization; a similar technique was originally developed to protect luminescent properties of carbon nanotubes in solution. These coated graphene dispersions are aggregation-resistant and may be reversibly redispersed in water even after freeze-drying. The coated graphene holds promise for a number of applications, including multifunctional graphene-polymer nanocomposites.

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mentioning

confidence: 99%

Localized In situ Polymerization on Graphene Surfaces for Stabilized Graphene Dispersions

Das

Wajid

Shelburne

et al. 2011

ACS Appl. Mater. Interfaces

109

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“…Effects of topological variations were observed experimentally at much larger distances in the work of Marquez et al, who used nanosphere lithography on highly-ordered pyrolytic graphite and template assisted admicellar polymerization to create nanostructures with different sized polystyrene nanospheres, which caused confinement both laterally and vertically. [13] Continuous honeycomb structures formed when using spheres larger than 500 nm while smaller spheres yielded discontinuous spikes; in all cases the polymer film was not completely filling the interstitial void space. A simple geometric argument revealed that the polymer-sphere separation distance varied between 4 nm and 250 nm, depending on nanoparticle size.…”

Section: Introductionmentioning

confidence: 97%

Directly probing surfactant adsorption on nanoscopic trenches and pillars

Hamon

Tabor

Striolo

et al. 2020

Journal of Colloid and Interface Science

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HypothesisConfinement causes a change in the amount of surfactant adsorbed and adsorption morphology. ExperimentsTwo cationic surfactants, tetradecyltrimethylammonium bromide (TTAB) and cetylpyridinium chloride (CPC) were adsorbed at the silica-water interface. Atomic force microscopy (AFM) force curves were measured on 50 nm and 80 nm wide trenches. Force curves were also measured on silica pillars, and the results were quantified based on distance from the edge. FindingsTrenches: Adsorbed surfactants films in 50 nm and 80 nm trenches showed the same breakthrough values. However, compared to unconfined values, TTAB in trenches had decreased break-through and adhesion forces while CPC in trenches had increased break-through and adhesion forces, indicating that surfactant identity varies the confinement effect.Pillars: Near the edge, few surfactants adsorb, and those that do stretch in the direction normal to the surface. While the experimental data agree qualitatively with previous coarse-grained molecular dynamic simulations, the length scales at which the phenomena are detected differ by ~ half-order of magnitude. Specifically, experimental data show measurable effects on adsorbed surfactant morphology at a distance from the edge 10-20 times the length of a surfactant molecule after accounting for the ~8 nm size of the probe.

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“…An indirect observation of this phenomenon was provided by Marquez et al, 41 who adsorbed surfactants on a surface to seed the so-called "template assisted admicellar polymerization". 42 Admicellar polymerization refers to a process by which monomers segregate within surfactant self-assembled aggregates. The monomers are then polymerized to obtain the final permanent polymeric structures.…”

Section: ■ Introductionmentioning

confidence: 99%

Surfactant Assemblies on Selected Nanostructured Surfaces: Evidence, Driving Forces, and Applications

Striolo

Grady

2017

Langmuir

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Surfactant adsorption at solid-liquid interfaces is critical for a number of applications of vast industrial interest and can also be used to seed surface-modification processes. Many of the surfaces of interest are nanostructured, as they might present surface roughness at the molecular scale, chemical heterogeneity, as well as a combination of both surface roughness and chemical heterogeneity. These effects provide lateral confinement on the surfactant aggregates. It is of interest to quantify how much surfactant adsorbs on such nanostructured surfaces and how the surfactant aggregates vary as the degree of lateral confinement changes. This review focuses on experimental evidence on selected substrates, including gold- and carbon-based substrates, suggesting that lateral confinement can have pronounced effects both on the amount adsorbed and on the morphology of the aggregates as well as on a systematic study, via diverse simulation approaches, on the effect of lateral confinement on the structure of the surfactant aggregates. Atomistic and coarse-grained simulations conducted for surfactants on graphene sheets and carbon nanotubes are reviewed, as well as coarse-grained simulations for surfactant adsorption on nanostructured surfaces. Finally, we suggest a few possible extensions of these studies that could positively impact a few practical applications. In particular, the simultaneous effect of lateral confinement and of the coadsorption of molecular compounds within the surface aggregates is expected to yield interesting fundamental results with long-lasting consequences in applications ranging from drug delivery to the design of advanced materials.

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Synthesis of Nanometer-Scale Polymeric Structures on Surfaces from Template Assisted Admicellar Polymerization: A Comparative Study with Protein Adsorption

Cited by 20 publications

References 68 publications

Localized In situ Polymerization on Graphene Surfaces for Stabilized Graphene Dispersions

Localized In situ Polymerization on Graphene Surfaces for Stabilized Graphene Dispersions

Directly probing surfactant adsorption on nanoscopic trenches and pillars

Surfactant Assemblies on Selected Nanostructured Surfaces: Evidence, Driving Forces, and Applications

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