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...

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...

Chemical, petrochemical, energy, and environment-related industries strongly require high-performance nanofiltration membranes applicable to organic solvents. To achieve high solvent permeability, filtration must be as thin possible, while retaining mechanical strength resistance. Here, we report on the preparation of ultrathin free-standing amorphous carbon with Young's moduli 90 170 gigapascals. The can separate dyes at a rate three orders magnitude greater than that commercially available...

Protein-containing polyelectrolyte multilayer films of poly(styrenesulfonate) and poly(allylamine hydrochloride), fabricated by the sequential adsorption anti-immunoglobulin G (anti-IgG) on solid substrates, have been characterized using atomic force microscopy (AFM), scanning electron (SEM), Fourier transform infrared reflection−absorption spectroscopy (FTIR-RAS). Visualization film structure nanometer scale, AFM SEM, showed that either layered or disordered were formed depending number...

Organized ceramic/polymer nanocomposites were designed from montmorillonite clay (Mont), cationic poly(ethylenimine) (PEI) or poly(dimethyldiallylammonium chloride) (PDDA) and proteins. Ordered multilayers with a controllable number of layers prepared by alternate adsorption delaminated (0.03 wt % dispersion) polycations. Quartz crystal microbalance, X-ray diffraction, scanning electron microscopy monitoring the assembly have shown formation ordered films bilayer thickness 3.3 nm for...

Fabrication of metal oxide thin films with thickness control nanometer precision is an important technology that leads to wide practical applications. The present study demonstrates a surface sol−gel process, composed chemisorption alkoxide, rinsing, hydrolysis, and drying, superior technique for the preparation ultrathin molecular precision. simplicity this process should be great advantage in commercial production nanosized films.

Ag-Pd bimetallic nanoparticles were prepared directly in ultrathin TiO(2)-gel films by a stepwise ion-exchange/reduction approach. Ion-exchange sites created using Mg(2+) ions as template. Ag(+) ion was then incorporated exchange, and converted into metallic low-temperature H(2) plasma, regenerating ion-exchange sites. The same procedure carried out for Pd(2+) ion, producing Pd-on-Ag nanoparticles, TEM observation plasmon resonance absorption indicate. By contrast, reversed metal...

Carbon nanoarchitectures derived from biobased building blocks are potential sustainable alternatives to electrode materials generated with petroleum-derived resources. We aim at developing a fundamental understanding on the connection between structure and electrochemical performance of porous carbon nanofiber (PCNF) architectures polysaccharide chitosan as block. fabricated range PCNF precursor tailored their by varying amount molecular weight sacrificial pore-forming polymer poly(ethylene...

Alternate adsorption of manganese oxide nanoparticles with polycations poly(dimethyldiallylammonium) (PDDA) or myoglobin (Mb) onto silver, quartz, and rough pyrolytic graphite gave stable, porous, ultrathin films. Quartz crystal microbalance (QCM) UV−vis absorbance revealed regular film growth at each step for MnO2 PDDA SiO2 Mb. Scanning electron microscopy MnO2/PDDA films showed smooth surfaces on the 20 nm scale cross sections consistent individual nanoparticles. QCM during Mb reflected a...

We have explored in situ synthesis of noble metal nanoparticles ultrathin TiO2−gel films, view the increasing importance such nanoparticle-containing thin films. The two-step procedure consists ion exchange matrix and subsequent reduction ions to by low-temperature H2 plasma, aqueous NaBH4, UV irradiation. Smooth transparent TiO2 films containing (Ag, Au, Pd, Pt) particles 2−10 nm were readily obtained this approach. size distribution could be controlled changing reaction conditions. film...

Abstract Ultrathin films of TiO2-based gel were prepared by repeating adsorption titanium(IV) butoxide (Ti(O-nBu)4) and subsequent hydrolysis the surface. Linear film growth was observed for at least 20 cycles, as monitored quartz crystal microbalance (QCM). Similar thin from aluminum(III) (Al(O-nBu)3), zirconium (IV) propoxide (Zr(O-nPr)4), niobium(V) (Nb(O-nBu)5), tetramethyl orthosilicate (Si(O-Me)4), their combinations.

Multilayer films of molybdenum oxide were prepared by means alternate adsorption ammonium octamolybdate ((NH4)4[Mo8O26]) and poly(allylamine hydrochloride) (PAH). The reproducibly grown at each cycle, as monitored a quartz crystal microbalance. Adsorption PAH on the surface layer was saturated with constant thickness 32 ± 21 Å. On other hand, did not show saturation. in individual step increased time rate ca. 5.7 Å/min due to condensation adsorbed resulting loss negative charges. resulted...

Ultrathin films of titanium oxide gel imprinted with 4-(4-propyloxyphenylazo)benzoic acid (C3AzoCO2H) were prepared by repeated immersion a gold-coated quartz crystal microbalance (QCM) electrode or plate in solutions C3AzoCO2H and butoxide (Ti(O-nBu)4) toluene/ethanol. Regular film growth was confirmed frequency decrement QCM measurements the appearance azobenzene absorption UV−vis spectroscopy. The template molecule could be completely removed upon treatment 1% aqueous ammonia. resulting...

Extension of the surface sol-gel process to form molecularly alternate metal oxide/polymer films is reported. The Figure a schematic illustration chemical structure TiO2/poly(acrylic acid) multilayers grown using this method. It demonstrated that can also be assembled aluminum, zirconium, niobium, and barium titanium alkoxides.

The surface charge and the sugar receptor site of concanavalin A are used to form layer-by-layer architectures with cationic poly(ethyleneimine) glycogen, respectively, as evidenced by quartz crystal microbalance scanning electron microscopy.

A simple and general method for the preparation of ultrathin, large-area, free-standing films nanofibrous composite materials was developed. First, positively charged cadmium hydroxide nanostrands 1.9 nm in diameter micrometers length were prepared by mixing dilute aqueous solutions chloride aminoethanol. Negatively dye molecules, proteins, nanoparticles, water-soluble fullerene or carbon nanotubes mixed with to give a well-dispersed solution corresponding composites. After filtration...

There are increasing requirements worldwide for advanced separation materials with applications in environmental protection processes. Various mesoporous polymeric have been developed and they considered as potential candidates. It is still challenging, however, to develop economically viable durable from low-cost, mass-produced materials. Here we report the fabrication of a nanofibrous network structure common polymers, based on microphase technique frozen polymer solutions. The resulting...

Astonishingly uniform polypyrrole nanocoating on morphologically complex cellulosic substances was achieved without disrupting the hierarchical network structures of individual cellulose fibers by means polymerization-induced adsorption.