Themed collection Materials and Nano Research in Brazil
Nanocatalysis by noble metal nanoparticles: controlled synthesis for the optimization and understanding of activities
This review discusses the importance of physical/chemical control in metallic NPs for the optimization and understanding of catalytic performances.
Recent advances in the use of carbon nanotubes as smart biomaterials
Carbon nanotubes (CNTs) have outstanding properties that can be used to produce intelligent devices to detect pathogens, delivery drugs, and replace bone and dental parts. Therefore, CNTs have been extensively studied as medical devices.
Nanofibrous scaffolds for biomedical applications
Tissue engineering is an emergent and very interesting research field, providing potential solutions for a myriad of challenges in healthcare.
Technical challenges of working with extracellular vesicles
Extracellular Vesicles (EVs) are gaining interest as central players in liquid biopsies, with potential applications in diagnosis, prognosis and therapeutic guidance in most pathological conditions.
PU nanocomposites from bifunctional nanoparticles: impact of liquid interphase on mechanical properties
Molten organic shell of hybrid Mag@PB1000 nanoparticles, covalently attached to the matrix, yields unexpected mechanical properties.
Wearable binary cooperative polypyrrole nanofilms for chemical mapping on skin
Wearable polypyrrole nanofilm arrays have been developed to extend the natural capabilities of the skin.
Engineering two-dimensional gold nanostructures using graphene oxide nanosheets as a template
Controlled growth of 2D gold nanostructures with tunable optical properties on the surface of graphene oxide by a surfactant-free method.
Sputtering deposition of gold nanoparticles onto graphene oxide functionalized with ionic liquids: biosensor materials for cholesterol detection
The sputtering deposition of Au nanoparticles onto ionic liquid-graphene oxide combined with cholesterol oxidase affords an efficient biosensor for cholesterol detection.
Oily core/amphiphilic polymer shell nanocapsules change the intracellular fate of doxorubicin in breast cancer cells
The aim of this work was to develop and test the in vitro biological activity of nanocapsules loaded with a doxorubicin (DOX) free base dissolved in a core of castor oil shelled by poly(methyl vinyl ether-co-maleic anhydride) conjugated to n-octadecylamine residues.
In situ three-dimensional imaging of strain in gold nanocrystals during catalytic oxidation
The formation of a nanotwin network in a gold nanoparticle correlates with its surface deformation and functional properties.
PEGylation as an efficient tool to enhance cytochrome c thermostability: a kinetic and thermodynamic study
PEGylation of cytochrome-c preserves activity and increases thermal stability, favoring the protein application as a biosensor.
Combining GeO2 passivation strategies aiming at dielectric layers with superior properties on germanium substrates
Hf and N incorporation in GeO2 suppresses its volatilization and further oxidation of the Ge substrate.
Characterization of the structural, optical, photocatalytic and in vitro and in vivo anti-inflammatory properties of Mn2+ doped Zn2GeO4 nanorods
The effect of Mn incorporation on the structural, optical, and photocatalytic properties of Zn2GeO4 (ZGO) host matrices was investigated.
An FeIII dinuclear metallacycle complex as a size-selective adsorbent for nitrogenous compounds and a potentially effective ammonia storage material
Study of the FeIII dinuclear metallacycle complex as a size selective adsorbent to amines with excellent capacity to adsorb ammonia.
Rutile nano–bio-interactions mediate dissimilar intracellular destiny in human skin cells
TiO2 NPs’ nano–bio-interactions mediate a distinct intracellular trafficking and destiny in human skin cells.
Expression of chirality amplification in self-assembled achiral/chiral polyfluorene blends
Chirality amplification in pristine and annealed thin films was evidenced in chiral/achiral polymer blends, promoting highly ordered self-assembled morphologies.
Precisely tailored shell thickness and Ln3+ content to produce multicolor emission from Nd3+-sensitized Gd3+-based core/shell/shell UCNPs through bi-directional energy transfer
Precise tailoring of the shell thickness and Ln3+ content produced multicolour emissions from core/shell/shell UCNPs via a bi-directional energy transfer mechanism.
Thulium doped LaF3 for nanothermometry operating over 1000 nm
The use and applications of infrared emitting rare-earth luminescent nanoparticles as nanothermometers have attracted a great deal of attention during the last few years.
Fast predictions of exciton diffusion length in organic materials
Simple computational protocol for the estimation of singlet exciton diffusion length in organic materials.
In-place bonded semiconductor membranes as compliant substrates for III–V compound devices
Overcoming the critical thickness limit in pseudomorphic growth of lattice mismatched heterostructures is a fundamental challenge in heteroepitaxy.
A random laser based on electrospun polymeric composite nanofibers with dual-size distribution
Electrospun fiber-based random lasers are environment-friendly flexible systems in which waveguiding/scattering processes provided by their structure with a broad distribution of diameters are essential elements to generate a suitable lasing mechanism.
Synthesis of Sr–morin complex and its in vitro response: decrease in osteoclast differentiation while sustaining osteoblast mineralization ability
We synthesized an easy-to-prepare Sr–morin complex that can sustain osteoblast mineralization and inhibit osteoclast differentiation at a low dose.
Changes induced by transition metal oxides in Pt nanoparticles unveil the effects of electronic properties on oxygen reduction activity
Relevance of electronic effects in oxygen reduction on Pt nanoparticles is unveiled taking advantage of metal–support interactions.
Allosteric inhibition of α-thrombin enzymatic activity with ultrasmall gold nanoparticles
The enzymatic activity of α-thrombin was allosterically regulated by interactions with ultrasmall gold nanoparticles.
Lipid nanoemulsion passive tumor accumulation dependence on tumor stage and anatomical location: a new mathematical model for in vivo imaging biodistribution studies
Nanoparticle delivery to tumor tissue is one of the most important applications of nanomedicine.
Nanocatalysts for hydrogen production from borohydride hydrolysis: graphene-derived thin films with Ag- and Ni-based nanoparticles
High values of maximum rates of hydrogen production are obtained using four thin film nanocomposites that showed recycling features.
Persistent luminescence warm-light LEDs based on Ti-doped RE2O2S materials prepared by rapid and energy-saving microwave-assisted synthesis
Persistent luminescence materials based on Ti-doped rare earth oxysulfides were obtained by a rapid, one-step process for application in self-sustained warm-light LEDs.
Interplay of non-uniform charge distribution on the electrochemical modification of graphene
Graphene electrodes exchange electrons with electrolyte inhomogeneously, preferentially at the edges, and covalent functionalization alters the electronic organization of graphene.
Luminescent silicone materials containing Eu3+-complexes for photonic applications
We report the synthesis and investigation of a set of highly red emissive [Eu(tta)3(H2O)2]-doped silicone samples.
Thermoplasmonic enhancement of upconversion in small-size doped NaGd(Y)F4 nanoparticles coupled to gold nanostars
Feeling the plasmonic heat: the photothermal effect in gold nanostars enhances the emission intensity of small-size upconverting nanocrystals.
Artificial cerium-based proenzymes confined in lyotropic liquid crystals: synthetic strategy and on-demand activation
The artificial proenzyme concept for ultra-small cerium-based nanoparticles: the on-demand activation of inactive nanoparticles to mimic the activity of superoxide dismutase.
Understanding the loss of electrochemical activity of nanosized LiMn2O4 particles: a combined experimental and ab initio DFT study
Nanosized spinel LMOs with crystallites smaller than ∼15 nm present significantly decreased electrochemical activity due to the increase of the energy barriers in the Li-ion diffusion paths.
The chemical fingerprint of hair melanosomes by infrared nano-spectroscopy
In situ characterization of the sheep hair melanosomes was performed with a spatial resolution of 25 nm using infrared nano-spectroscopy.
Uniformly self-decorated Co3O4 nanoparticles on N, S co-doped carbon layers derived from a camphor sulfonic acid and metal–organic framework hybrid as an oxygen evolution electrocatalyst
A simple one step preparation of Co3O4 nanoparticle decorated carbon from a camphor sulfonic acid and metal–organic framework hybrid.
Carboxyl-functionalized ionic liquids: synthesis, characterization and synergy with rare-earth ions
Herein, we describe for the first time room temperature ionic liquids (RTILs) and imidazole-based cations with appended carboxylic acids as terminals, which are directly derived from the anhydrides.
Marrying SPR excitation and metal–support interactions: unravelling the contribution of active surface species in plasmonic catalysis
We studied the contribution from active surface oxide species in SPR-mediated oxidation reactions.
Covalent functionalization of graphene oxide with D-mannose: evaluating the hemolytic effect and protein corona formation
Graphene oxide mannosylation impacts on RBCs toxicity and plasma protein interactions.
Conductivity dynamics of metallic-to-insulator transition near room temperature in normal spinel CoFe2O4 nanoparticles
Designing a ferrite with dual electrical characteristics: the effect of temperature and site occupancy on the conductivity mechanisms of spinel CoFe2O4.
Effects of accelerated degradation on metal supported thin film-based solid oxide fuel cells
Elemental distribution effects are detected throughout the metal supported TF-SOFC, indicating low energy surface elemental interdiffusion and electromigration effects.
A comprehensive structural and microstructural investigation of a new iron–telluride nano phase
A nanocrystalline iron-rich telluride, Fe5Te4, was prepared mechanochemically using ball milling procedures in an inert atmosphere, starting from FexTe powder mixtures with x = 1.0, 1.25 and 1.5, with x = 1.25 leading to the pure phase.
Flexible room-temperature volatile organic compound sensors based on reduced graphene oxide–WO3·0.33H2O nano-needles
Isopropanol sensors on flexible PET substrates presented high-performance at room-temperature in terms of sensitivity, selectivity and mechanical stability.
Silk fibroin as a biotemplate for hierarchical porous silica monoliths for random laser applications
Bombyx mori silk fibroin offers unlimited opportunities for functionalization, processing, and biological integration.
Rigorous analysis of Casimir and van der Waals forces on a silicon nano-optomechanical device actuated by optical forces
We show how van der Waals and Casimir forces affect nano-optomechanical devices, by changing their operation and design limits.
Carbon-supported metal nanodendrites as efficient, stable catalysts for the oxygen reduction reaction
One-pot-produced XC-72 carbon-supported metal nanodendrites with Pt or Pt–Pd surfaces proved highly catalytic toward the ORR.
Combating pathogens with Cs2.5H0.5PW12O40 nanoparticles: a new proton-regulated antimicrobial agent
A cesium salt of phosphotungstic heteropolyacid (Cs2.5H0.5PW12O40) acts as a proton-regulated antimicrobial combating human pathogens.
All at once: how electrochemistry can be used to design and access multiple compositions in a single sample
A library of PtRh compositions is simultaneously obtained by electrodeposition in a diffusion-controlled cell. This approach enables to perform compositional studies in a single piece of substrate and open new perspectives of studies in heterogeneous catalysis and electrocatalysis.
Quantum capacitance as a reagentless molecular sensing element
The application of nanoscale capacitance as a transduction of molecular recognition relevant to molecular diagnostics is demonstrated, wherein the energy-related signal relates directly to the electron occupation of quantized states.
Biomolecular corona formation: nature and bactericidal impact on surface-modified silica nanoparticles
The biomolecular corona impacts the overall surface charge, the colloidal stability and the biological response of functionalized nanoparticles.
Upconversion nanoparticle-decorated gold nanoshells for near-infrared induced heating and thermometry
The present work involves the design of a multifunctional system based on gold nanoshells (AuNSs) decorated with lanthanide-based upconversion nanoparticles (UCNPs) intended as an optical heater and temperature probe at the nanoscale.
Diruthenium(II,III) metallodrugs of ibuprofen and naproxen encapsulated in intravenously injectable polymer–lipid nanoparticles exhibit enhanced activity against breast and prostate cancer cells
Stable nanoformulations of diruthenium(II,III)-NSAID metallodrugs encapsulated in intravenously injectable polymer-lipid NPs have been prepared and tested in cancer cells.
Graphite exfoliation in cellulose solutions
Shaking graphite powder dispersed in an aqueous alkaline cellulose solution produces stable dispersions of hydrophilic, thin graphite sheets with lateral dimensions reaching many micrometers.
Continuous microfiber drawing by interfacial charge complexation between anionic cellulose nanofibers and cationic chitosan
This study describes a novel process of drawing fibers generated by the electrostatic complexation of negatively charged nanocellulose fibers with positively charged chitosan macromolecules.
Thermal decomposition and recovery properties of ZnAl–CO3 layered double hydroxide for anionic dye adsorption: insight into the aggregative nucleation and growth mechanism of the LDH memory effect.
The LDH memory effect is driven by an aggregative nucleation and growth mechanism limited by the adsorption of the anionic dye in on the external surface.
Tailoring multifunctional graphene-based thin films: from nanocatalysts to SERS substrates
Synthesis of functionalized graphene-based thin films through the interfacial route, their nanocomposites with Ag-NPs, and their multiple applications.
Thermal sensitivity of frequency upconversion in Al4B2O9:Yb3+/Nd3+ nanoparticles
We report measurements of frequency upconversion (UC) processes in ytterbium (Yb3+) and neodymium (Nd3+) doped Al4B2O9 nanoparticles – labeled as Al4B2O9:Yb3+/Nd3+ – prepared by a polymeric precursor method.