Multilayer Nanoreactors for Metallic and Semiconducting Particles

Joly, Simon; Kane, Ravi S.; Radzilowski, L. H.; Wang, T.; Wu, Aiping; Cohen, Robert E.; Thomas, Edwin L.; Rubner, Michael F.

doi:10.1021/la991089t

Cited by 297 publications

(323 citation statements)

References 51 publications

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“…By coating the top surface of the organometallic polymeric superlattices with a thin gold layer, their growth and architectures can actually be straightforwardly imaged by transmission electron microscopy (TEM). TEM imaging of multilayer structures was originally developed to locate interfaces between inorganic-organic hybrid multilayer blocks [49]. Characterization of PFS multilayers by TEM may allow the effect of polymer structure, composition and charge density on thin film thicknesses to be established.…”

Section: Multilayer Formation and Characterizationmentioning

confidence: 99%

Electrostatic Assembly with Poly(ferrocenylsilanes)

Hempenius

Vancso

2007

J Inorg Organomet Polym

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New frontiers in polymer science involve the incorporation of functional species into material systems. The electrostatic layer-by-layer (LBL) self-assembly technique constitutes a versatile tool for nano-and microscale fabrication of devices and novel material structures. Although a rapidly growing attention has been paid to this area, most of the studies conducted were based on organic polymeric electrolytes. Due to synthetic developments, new polymeric structures with inorganic elements and transition metals incorporated in the main chain have become accessible. With the development of new synthesis routes, organometallic poly(ferrocenylsilane) polycations and polyanions emerged. Their charged nature and water-solubility made them excellent candidates for the extension of electrostatic multilayer assembly to organometallic polymeric materials. The present review gives a concise summary on the LBL fabrication of organometallic thin films and microcapsules based on water-soluble poly(ferrocenylsilane) polyions. The unique functions of these structures come from the molecular structure of poly(ferrocenylsilanes), in which silicon atoms and redoxactive ferrocene units are present. In this context, the diverse application potentials of these organometallic multilayer structures are also discussed.

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Section: Multilayer Formation and Characterizationmentioning

confidence: 99%

Electrostatic Assembly with Poly(ferrocenylsilanes)

Hempenius

Vancso

2007

J Inorg Organomet Polym

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“…The existence of a layered structure with an interpenetration between neighboring layers was evidenced by x-ray reflectivity measurements (12) for the widely studied poly(styrenesulfonate)͞poly(allylamine hydrochloride) system. Observation by transmission electron microscopy also allowed the distinction of the vertical organization of multilayer hetero-structures formed with two different polyelectrolyte systems (13). However, up to now, the resolution obtained with electron microscopy did not permit a direct visualization of a layering for a given system.…”

mentioning

confidence: 99%

Molecular basis for the explanation of the exponential growth of polyelectrolyte multilayers

Picart

Mutterer

Richert

et al. 2002

Proc. Natl. Acad. Sci. U.S.A.

848

1,059

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The structure of poly(L-lysine) (PLL)͞hyaluronan (HA) polyelectrolyte multilayers formed by electrostatic self-assembly is studied by using confocal laser scanning microscopy, quartz crystal microbalance, and optical waveguide lightmode spectroscopy. These films exhibit an exponential growth regime where the thickness increases exponentially with the number of deposited layers, leading to micrometer thick films. Previously such a growth regime was suggested to result from an ''in'' and ''out'' diffusion of the PLL chains through the film during buildup, but direct evidence was lacking. The use of dye-conjugated polyelectrolytes now allows a direct three-dimensional visualization of the film construction by introducing fluorescent polyelectrolytes at different steps during the film buildup. We find that, as postulated, PLL diffuses throughout the film down into the substrate after each new PLL injection and out of the film after each PLL rinsing and further after each HA injection. As PLL reaches the outer layer of the film it interacts with the incoming HA, forming the new HA͞PLL layer. The thickness of this new layer is thus proportional to the amount of PLL that diffuses out of the film during the buildup step, which explains the exponential growth regime. HA layers are also visualized but no diffusion is observed, leading to a stratified film structure. We believe that such a diffusion-based buildup mechanism explains most of the exponential-like growth processes of polyelectrolyte multilayers reported in the literature.hyaluronan ͉ poly(L-lysine) ͉ confocal laser scanning microscopy ͉ diffusion ͉ film structure

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“…However, it is difficult to prepare nanoparticles composite MD films using the above-mentioned steps, since it is difficult to control the size of nanoparticles, preventing the reunion of nanoparticles and making the nanoparticles dispersed in the film uniformity. Recently, polyelectrolyte multilayers have emerged as a useful vessel for novel nanomaterial synthesis [61][62][63][64]. The studies show that various nanomaterials with desirable shape and composition can be synthesized by loading the reactants into the PEMs interior and then performing appropriate reactions such as reduction, sulfuration, and so on.…”

Section: Nanoscaled Films and Layersmentioning

confidence: 99%

Advance in Tribology Study of Polyelectrolyte Multilayers

Guo¹,

Wang²

2017

Nanoscaled Films and Layers

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This review introduced the preparation and structural characterization of polyelectrolyte multilayers in recent years and also summarized the tribology research progress of the polyelectrolyte multilayers, including tribological properties, surface adhesion characteristics, and wear resistance properties. Statistics analysis indicated that nanoparticlesdoped polyelectrolyte multilayers present better friction and wear performance than pristine polyelectrolyte multilayers. Furthermore, the in situ growth method resulted in improved structural order of nanoparticles composite molecular deposition film. In situ nanoparticles not only reduced the molecular deposition film surface adhesion force and friction force but also significantly improved the life of wear resistance. That was due to the nanoparticles that possessed a good load-carrying capacity and reduced the mobility of the polymer-chain segments, which can undergo reversible shear deformation. Based on this, further research direction of in situ nanoparticles molecular deposition film was proposed.

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Multilayer Nanoreactors for Metallic and Semiconducting Particles

Cited by 297 publications

References 51 publications

Electrostatic Assembly with Poly(ferrocenylsilanes)

Electrostatic Assembly with Poly(ferrocenylsilanes)

Molecular basis for the explanation of the exponential growth of polyelectrolyte multilayers

Advance in Tribology Study of Polyelectrolyte Multilayers

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