ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAssembly of Multicomponent Protein Films by Means Electrostatic Layer-by-Layer AdsorptionYuri Lvov, Katsuhiko Ariga, Izumi Ichinose, and Toyoki KunitakeCite this: J. Am. Chem. Soc. 1995, 117, 22, 6117–6123Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995https://pubs.acs.org/doi/10.1021/ja00127a026https://doi.org/10.1021/ja00127a026research-articleACS PublicationsRequest reuse...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAssembly, structural characterization, and thermal behavior of layer-by-layer deposited ultrathin films poly(vinyl sulfate) poly(allylamine)Yuri Lvov, Gero Decher, Helmuth MoehwaldCite this: Langmuir 1993, 9, 2, 481–486Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published inissue 1 February 1993https://pubs.acs.org/doi/10.1021/la00026a020https://doi.org/10.1021/la00026a020research-articleACS...

Halloysite is aluminosilicate clay with hollow tubular structure of 50 nm external diameter and 15 lumen. biocompatibility study important for its potential applications in polymer composites, bone implants, controlled drug delivery, protective coating (e.g., anticorrosion or antimolding). nanotubes were added to different cell cultures toxicity tests. Its fluorescence functionalization by aminopropyltriethosilane (APTES) fluorescently labeled polyelectrolyte layers allowed following...

Electrostatic alternate adsorption was successfully employed for low-molecular-weight dyes, leading to a large variety of dye−polyion layer-by-layer assemblies. The assembling process individual layers Congo Red (CR)−poly(diallyldimethylammonium chloride) (PDDA) investigated by using quartz crystal microbalance (QCM). in-situ QCM measurement revealed that the dye occurred at rate similar conventional polyion adsorption. Successful assembly CR layer confirmed also increasing intensities in UV...

Alternate layer-by-layer polyion adsorption onto gold electrodes coated with chemisorbed mercaptopropanesulfonic acid gave stable, electroactive multilayer films containing the proteins myoglobin and cytochrome P450cam. Direct, reversible, electron exchange between involved heme FeIII/FeII redox couples. With oxygen in solution, electrons were also transferred to FeII−O2 complexes of these proteins, a key step for oxidative enzyme catalysis. Film assembly Mb was done by sequential...

Alternate layer-by-layer assembly of colloidal SiO2 particles with polycations has been investigated by quartz crystal microbalance (QCM), scanning electron microscopy (SEM), and atomic force (AFM). QCM measurement confirmed the high regularity reproducibility assembling process that depends on particle concentration, size, ionic strength. The individual adsorption step was completed within 15 s. thickness adsorbed layers increased increasing concentrations at three sizes used (45, 25, 78 nm...

Stable hollow polyelectrolyte capsules were produced by means of the layer-by-layer assembling poly(allylamine), PAH, and poly(styrenesulfonate), PSS, on melamine formaldehyde microcores followed core decomposition at low pH. These are nonpermeable for urease in water become permeable a water/ethanol mixture. The loaded with mixture then resuspended water. molecules kept capsule, whereas small urea rapidly diffuse through capsule wall providing substrate biocatalytic reaction.

Halloysite clay tubes have 50 nm diameter and chemically different inner outer walls (inner surface of aluminum oxide silica). Due to this chemistry, the selective etching alumina from inside tube was realized, while preserving their external (lumen changed 15 25 nm). This increases 2-3 times lumen capacity for loading further sustained release active chemical agents such as metals, corrosion inhibitors, drugs. In particular, halloysite efficiency benzotriazole increased 4 by 60% within...

Natural polyphenols with previously demonstrated anticancer potential, epigallocatechin gallate (EGCG), tannic acid, curcumin, and theaflavin, were encased into gelatin-based 200 nm nanoparticles consisting of a soft gel-like interior or without surrounding LbL shell polyelectrolytes (polystyrene sulfonate/polyallylamine hydrochloride, polyglutamic acid/poly-l-lysine, dextran sulfate/protamine sulfate, carboxymethyl cellulose/gelatin, type A) assembled using the layer-by-layer technique. The...

Halloysite clay nanotubes were investigated as a tubular container for the corrosion inhibitor benzotriazole. is naturally occurring cylindrical mineral with an internal diameter in nanometer range and length up to several micrometers, yielding high-aspect-ratio hollow tube structure. may be used additive paints produce functional composite coating material. A maximum benzotriazole loading of 5% by weight was achieved tubes 50 nm external diameters lumen 15 nm. Variable release rates...

Selective fatty acid hydrophobization of the inner surface tubule halloysite clay is demonstrated. Aqueous phosphonic was found to bind alumina sites at tube lumen and did not tube's outer siloxane surface. The bonding characterized with solid-state nuclear magnetic resonance ((29)Si, (13)C, (31)P NMR), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy. NMR FTIR spectroscopy selectively modified tubes proved binding octadecylphosphonic within through bidentate tridentate...

Halloysite, a naturally occurring, 50-nm-diameter tubular material, has been utilized as new biomineralization nanoreactor to form urease-catalyzed CaCO3. The CaCO3 synthesis occurs exclusively inside the halloysite nanotubes, with no carbonate found on outer surface of nanotubes or in solution. Precipitated completely fills inner nanotube lumen (see picture) and exhibits metastable vaterite phase structure.

We explored using a magnetic field to modulate the permeability of polyelectrolyte microcapsules prepared by layer-by-layer self-assembly. Ferromagnetic gold-coated cobalt (Co@Au) nanoparticles (3 nm diameter) were embedded inside capsule walls. The final 5 μm diameter had wall structures consisting 4 bilayers poly(sodium styrene sulfonate)/poly(allylamine hydrochloride) (PSS/PAH), 1 layer Co@Au, and PSS/PAH. External alternating fields 100−300 Hz 1200 Oe applied rotate Co@Au nanoparticles,...

Guided tissue regeneration/guided bone regeneration membranes with sustained drug delivery were developed by electrospinning drug-loaded halloysite clay nanotubes doped into poly(caprolactone)/gelatin microfibers. Use of 20 wt % nanotube content in fiber allowed for 25 metronidazole loading the membrane. Nanotubes a diameter 50 nm and length 600 aligned within 400 electrospun fibers, resulting doubling tensile strength along collector rotating direction. The halloysite-doped acted as...

Halloysite clay tubes of 50 nm diameter and ca. 1000 length were analyzed as potential nanocontainers for loading, storage induced sustained release chemical agents. is a natural aluminosilicate mineral with hollow cylindrical geometry submicron size. nanotubes loaded the corrosion inhibitor benzotriazole can be admixed into paint to improve its anticorrosion performances well coating tensile strength. Corrosion protection such was evaluated by direct exposure coated metal (copper) highly...

We demonstrate the use of a catecholic anchor (Dopa) for selective modification inner surface an halloysite clay nanotube. Aqueous Dopa binds to alumina at tube lumen and does not bind silica under same conditions. Selectivity was evidenced using X-ray photoelectron spectroscopy (XPS) (13)C solid state NMR spectroscopy. Surface-initiated atom transfer radical polymerization (SI-ATRP) performed through selectively adsorbed graft layer polymer brush into nanotube lumen.