Ten different nanotextured films were prepared from six commercial and four laboratory synthesized precursors. Krypton adsorption isotherms on the parent powders indicate effect of sintering agglomeration. Electrochemical characterization was aimed at double‐layer charging insertion. The relations between film's morphology, properties, electrochemical behavior in accumulation regime are discussed.

Ultrasmall, crystalline, and dispersible NiO nanoparticles are prepared for the first time, it is shown that they promising candidates as catalysts electrochemical water oxidation. Using a solvothermal reaction in tert ‐butanol, very small nickel oxide nanocrystals can be made with sizes tunable from 2.5 to 5 nm narrow particle size distribution. The crystals perfectly ethanol even after drying, giving stable transparent colloidal dispersions. structure of corresponds phase‐pure...

Thin layer electrodes (0.2−0.5 μm) of highly organized nanotextured anatase were prepared by hydrolysis TiCl4 in the presence poly(alkylene oxide) block copolymer, Pluronic P-123, acting as structure-directing agent. Electrochemical properties these layers studied KCF3SO3 + propylene carbonate and LiN(CF3SO2)2 ethylene dimethoxyethane. The showed unusually fast capacitive Li-insertion charging. A most striking effect was occurrence two new pairs peaks cyclic voltammograms Li+ containing...

This work focuses on the synthesis and photocatalytic performance of mesoporous TiO2 films containing embedded gold nanostructures. The were prepared by EISA (evaporation-induced self-assembly) process loaded with Au either impregnation followed reduction NaBH4 or pulsed cathodic electrodeposition. latter approach represents a considerably easier faster synthetic method results in dendritic nanostructures as replica pore system. as-prepared composite characterized scanning transmission...

Thin mesoporous films of ZnO were prepared by electrochemical deposition using eosin Y as a structure-directing agent. After removal the from structure, transparent porous obtained. The porosity and surface area these determined performing krypton BET measurements. Electrochemical parameters, such time concentration in plating bath, optimized to prepare with large internal areas good mechanical properties. Eosin concentrations 50−60 μM found give best-quality zinc oxide film thicknesses...

Titanium dioxide is the most important photocatalyst used for purifying applications. The purpose of this study was to investigate photocatalytic activity commercial product Protectam FN2, containing Evonik P25 titanium nanopowder, with regard NO and NO2 abatement. Photocatalytic experiments on coatings concrete plaster substrates were carried out in two types flow reactors, namely one laminar another ideally-mixed flow, under "real world conditions" temperature, relative humidity,...

Conducting antimony-doped tin oxide (ATO) nanoparticles are prepared by a nonaqueous solution route, using benzyl alcohol as both the oxygen source and solvent, tetrachloride various Sb(III) Sb(V) compounds antimony sources, respectively. This reaction produces nonagglomerated crystalline particles 3−4 nm in size, which can be easily redispersed high concentrations variety of solvents to form stable transparent colloidal solutions without any stabilizing agents. The synthesis temperature is...

Crystalline niobium-doped titania nanoparticles were synthesized via solvothermal procedures using tert-butyl alcohol as a novel reaction medium, and their assembly into mesoporous films was investigated. The procedure enables the preparation of crystalline doped undoped nonagglomerated nanoparticles, whose size can be controlled from 4 to 15 nm by changing temperature time. anatase lattice these particles incorporate more than 20 mol % Nb ions. easily dispersed at high concentrations in THF...

Ultrasmall and highly soluble anatase nanoparticles were synthesized from TiCl4 using tert-butyl alcohol as a new reaction medium. This synthetic protocol widens the scope of nonaqueous sol−gel methods to TiO2 around 3 nm with excellent dispersibility in ethanol tert-butanol. Microwave heating was found enhance crystallinity drastically shorten time less than 1 h at temperatures low 50 °C. The extremely small size their make it possible use commercial Pluronic surfactants for...

Microbial colonization of biomedical devices is a recognized complication contributing to healthcare-associated infections. One the possible approaches prevent surfaces from biofilm formation antimicrobial photodynamic inactivation based on cytotoxic effect singlet oxygen, O2(1Δg), short-lived, highly oxidative species, produced by energy transfer between excited photosensitizers and molecular oxygen. We synthesized porphyrin-based covalent organic frameworks (COFs) Schiff-base chemistry....

The tunable porosity of titania thin films is a key factor for successful applications in photovoltaics, sensing, and photocatalysis. Here, we report on nanocrystalline cellulose (NCC) as novel shape-persistent templating agent enabling the straightforward synthesis mesoporous films. obtained structures are highly porous anatase morphologies having well-defined, narrow pore size distributions. By varying titania-to-template ratio, it possible to tune surface area, size, anisotropy,...

Abstract A study of electrochemical Li insertion combined with structural and textural analysis enabled the identification quantification individual crystalline amorphous phases in mesoporous TiO 2 films prepared by evaporation‐induced self‐assembly procedure. It was found that properties amphiphilic block copolymers used as templates, namely those a novel poly(ethylene‐ co ‐butylene)‐ b ‐poly(ethylene oxide) polymer (KLE) commercial Pluronic P123 (HO(CH CH O) 20 (CH CH(CH 3 )O) 70 H),...

We present a novel "brick and mortar" strategy for creating highly efficient transparent TiO2 coatings photocatalytic photovoltaic applications. Our approach is based on the fusion of preformed titania nanocrystalline "bricks" through surfactant-templated sol−gel "mortar", which acts as structure-directing matrix chemical glue. The similar composition both bricks mortar leads to striking synergy in interaction crystalline amorphous components, such that crystallization enhanced upon thermal...

We present a comparative study of two different ZnO porous film morphologies for dye-sensitized solar cell (DSSC) fabrications. Nanoparticulate was prepared by the doctor-blade technique starting from paste containing nanoparticles. Nanoporous films were grown soft template-assisted electrochemical growth technique. The thicknesses adjusted at similar roughness about 300 in order to permit worthy comparison. effects on performances sensitization dyes belonging three families, namely,...

This paper describes a study of the nature and accessibility acid sites in micromesoporous mordenite zeolites obtained by desilication dealumination analysis their activity selectivity hydroisomerization n-hexane. Alkaline–acid, acid–alkaline–acid, fluorination–alkaline–acid postsynthesis treatments were employed for preparation mordenites. The FTIR spectra adsorbed d3-acetonitrille, 27Al MAS NMR, HR-TEM, N2 adsorption used quantitative Brønsted Lewis sites, coordination Al atoms, textural...

Nitrogen adsorption isotherms have been measured on a series of aluminosilicate and titanosilicate MCM-41 Molecular sieves, whose mean pore radius varied from ca. 0.9 to 2 nm. By means comparison plots the nature these materials was found depend strongly their size. With pores around 1 nm multilayer coverage walls occurs. If is increased 1.5–1.8 mechanism changes into two-stage one, i.e.. suceeded by spontaneous filling volume capillary condensation without hysteresis. In even greater usual...

Adsorption isotherms of cyclopentane and nitrogen on a new porous crystalline aluminosilicate from the family MCM-41 are characterized by volume filling channels capillary condensation without hysteresis, which commences in region prior to lower closure point at hysteresis loop.

The effect of temperature on adsorption isotherms cyclopentane mesoporous MCM-41 molecular sieves with different pore size has been determined at 243–333 K. occurrence hysteresis upon capillary condensation in mesopores depends the critical temperature, which is lower than bulk and decreases decreasing diameter. If within range experimental temperatures adsorption, a single sieve may occur both reversibly (hypercritical region) irreversibly (subcritical region).

Mesoporous silica thin films were shown to be an appropriate matrix for immobilization of discrete electroactive moieties, yielding uniform transparent film electrodes with defined texture and enhanced electrochemical activity. The mesoporous prepared on conducting FTO-coated glass substrate postsynthetically functionalized. Alkoxysilanes used as precursors subsequent grafting via ionic or covalent bonds representative species, such polyoxometalate PMo12O403-, hexacyanoferrate(III),...