The possibility of controlling the photocatalytic activity TiO2 nanoparticles by tailoring their crystalline structure and morphology is a current topic great interest. In this study, broad variety well-faceted particles with different phase compositions, sizes, shapes have been obtained from concentrated TiOCl2 solutions systematically changing temperature, pH, duration hydrothermal treatment. guide to select suitable experimental conditions was provided thermodynamic modeling based on...

The promising properties of anatase TiO(2) nanocrystals exposing specific surfaces have been investigated in depth both theoretically and experimentally. However, a clear assessment the role crystal faces photocatalytic processes is still under debate. In order to clarify this issue, we comprehensively explored photogenerated defects particular their dependence on exposed shape-controlled anatase. Nanocrystals were synthesized by solvothermal reaction titanium butoxide presence oleic acid...

Macroporous WO(3) films with inverted opal structure were synthesized by one-step procedure, which involves the self-assembly of spherical templating agents and simultaneous sol-gel condensation semiconductor alkoxide precursor. Transition metal doping, aimed to enhance electrical response, was carried out including Cr(III) Pt(IV) centers in oxide matrix. It turned that Cr remains as homogeneously dispersed inside host, while Pt undergoes reduction aggregation form nanoclusters located at...

The efficiency of sulfur vulcanization reaction in rubber industry is generally improved thanks to the combined use accelerators (as sulphenamides), activators (inorganic oxides), and co-activators (fatty acids). interaction among these species responsible for formation intermediate metal complexes, which are able increase reactivity towards polymer promote chemical cross-links between chains. high number reactions that involved contemporarily process hinders complete understanding its...

The present study reports on the synthesis and electrochemical behavior of Na(0.71)CoO(2), a promising candidate as cathode for Na-based batteries. material was obtained in two different morphologies by double-step route, which is cheap easy to scale up: hydrothermal produce Co(3)O(4) with tailored nanometric morphology, followed solid-state reaction NaOH, or alternatively Na(2)CO(3), promote Na intercalation. Both products are highly crystalline have P2-Na(0.71)CoO(2) crystal phase, but...

Silica-styrene butadiene rubber (SBR) nanocomposites were prepared by using shape-controlled spherical and rod-like silica nanoparticles (NPs) with different aspect ratios (AR = 1-5), obtained a sol-gel route assisted structure directing agent. The used as models to study the influence of particle shape on formation nanoscale immobilized at silica-rubber interface its effect dynamic-mechanical behavior. TEM AFM tapping mode analyses demonstrated that particles are surrounded layer surface....

Hydrogen production via water electrolysis defines the novel energy vector for achieving a sustainable society. However, true progress of given technology is hindered by sluggish and complex hydrogen evolution reaction (HER) occurring at cathodic side system where overpriced scarce Pt-based electrocatalysts are usually employed. Therefore, efficient platinum group metals (PGMs)-free to carry out HER with accelerated kinetics urgently demanded. In this scenario, molybdenum disulfide (MoS2)...

A new, fast, one-pot synthesis of SnO2 and Pt−doped inverted opal thin films, to be used as materials for gas sensing, was carried out. Films were built from crystalline cassiterite nanoparticles, uniform in size (∼5 nm), resulting a well-organized hierarchical structure macro- mesopores. The noble metal homogeneously dispersed into the sensing layer oxide doping centers present Pt(IV) Pt(II) species, partially reduced Pt(0) after interaction with reducing (CO). values electrical sensitivity...

We report on the sensing behavior of SnO2 shape controlled nanocrystals in order to evaluate role their exposed crystal surfaces mechanism. Octahedral (OCT), elongated dodecahedral (DOD), and nanobar shaped (NBA) were synthesized by previously reported procedures performances evaluated toward CO. Singly ionized oxygen vacancies (VO•) detected electron spin resonance (ESR), abundance reactivity associated faces and, turn, responses nanocrystals. Results indicated that electrical properties...

Photocatalytic activities of mesoporous RuO2/TiO2 heterojunction nanocomposites for organic dye decomposition and H2 production by methanol photoreforming have been studied as a function the RuO2 loading in 1–10 wt % range. An optimum was evidenced both kinds reaction, corresponding showing much higher than pure TiO2 commercial reference P25. Thus, 1 photocatalyst led to highest rates degradation cationic (methylene blue) anionic (methyl orange) dyes under UV light illumination. To get...

The present study reports on a simple preparation strategy of hybrid catalyst, TiO2/HKUST-1, containing TiO2 anatase nanoparticles (NPs) with tailored morphology and photocatalytic activity coupled porous metal-organic framework (MOF), namely HKUST-1, as an advanced material for the CO2 reduction. In detail, TiO2/HKUST-1 catalyst was prepared via easy slow-diffusion method combined step-by-step self-assembly at room temperature. growth crystalline HKUST-1 onto titania surface achieved by...

The sol−gel synthesis of TiO2 from TiCl4 assisted by the triblock copolymer EO20−PO70−EO20 (EO = −CH2CH2O−, PO −CH2(CH3)CHO−) as templating agent was carried out systematically changing H2O:Ti (rw) and HCl:Ti (ra) molar ratios. Mesoporous nanocrystalline samples with well-defined controlled phase composition (anatase, rutile, mixed phase) were obtained after calcination at 400 °C characterized for morphology, particle size, shape using TEM, HRTEM, XRD, surface area measurements. role rw ra...

Silica–natural rubber composites were prepared by in situ sol–gel synthesis of silica nanoparticles functionalized with alkylthiol or alkylpolysulfide. The functionalizing groups linked to particles hydrolysis and polycondensation a mixture tetraethoxysilane (TEOS) suitable amount (3-mercaptopropyl) trimethoxysilane (TMSPM), bis (3-triethoxysilylpropyl) disulfide (TESPD) tetrasulfide (TESPT). Particles from TEOS are spherical, instead those TESPD, TESPT TMSPM have irregular anisotropic...

We comprehensively explored the photocatalytic properties, in H2 production by methanol photosteam reforming, of anatase nanocrystals with nearly rectangular (RC), rhombic (R), and nanobar (NB) shapes having exposed {001}, {101}, {010} surfaces. The aim was to relate reactivity both type crystal facets photogenerated defects. electron spin resonance (ESR) spectra reveal that amount Ti3+ (electron traps) is parallel evolution rate becomes a maximum for RC nanocrystals, which display highest...

Lithium metal batteries (LMBs) will be a breakthrough in automotive applications, but they require the development of next-generation solid-state electrolytes (SSEs) to stabilize anode interface. Polymer-in-ceramic PEO/TiO2 nanocomposite SSEs show outstanding properties, allowing unprecedented LMBs durability and self-healing capabilities. However, mechanism underlying inhibition/delay dendrite growth is not well understood. In fact, inorganic phase could act as both chemical mechanical...

Hybrid nanoscintillators, which feature a heavy inorganic nanoparticle conjugated with an organic emitter, represent promising avenue for advancements in diverse fields, including high-energy physics, homeland security, and biomedicine. Many research studies have shown the suitability of hybrid nanoscintillators radiation oncology, showing potential to improve therapeutic results compared traditional protocols. In this work, we studied SiO2/ZnO nanoparticles functionalized porphyrin as...

Abstract Electrochemical nitrate reduction (NO 3 − RR) is being recognized as a sustainable approach to synthesizing ammonia which essential for the chemical industry and key agricultural input conventionally produced through hard‐to‐abate Haber Bosch process. Among various transition metals, copper‐based electrocatalysts stand out in efficaciously carrying this reaction owing their superior electrocatalytic activity selectivity. In context, here, current state of research advanced...