Top Research Papers on Nanoparticles

This method provides a test for studies of photoinduced electron transfer at the single-nanoparticle level and the combination of theoretical simulation and high-resolution photocurrent measurement allow electron-transfer information of a single N719@TiO2 nanoparticle to be quantified at single-molecule accuracy.

Two laser processes, flat plate ablation (FPA) and laser ablation of microparticle aerosols (LAMA), capable of producing nanoparticles and nanoparticulate thick films of Terfenol-D (Fe_1.92Tb_0.3Dy_0.7) were investigated. The influence of processing parameters on the sizes, compositions, and morphologies of the nanoparticles produced using these processes were studied by transmission electron microscopy. The nanoparticles were used to deposit nanoparticulate films by supersonic impaction with thicknesses ranging from 4 to 50 μm, depending on processing conditions. The microstructures and prope...

It was found that different sized gold nanoparticles had different conjugation efficiencies under different pH values and concentrations of antibody, which will be helpful for the application of antibody-labeledgold nanoparticles in the fields of clinic diagnosis, environmental analysis and so on in future.

Cadmium telluride (CdTe) nanoparticles were grown in the interior of a SnO_(2) transparent matrix by means of the r.f. sputtering technique. X-ray diffraction (XRD) patterns reveal that the CdTe quantum dots (QD) grow in the hexagonal wurtzite (W) phase. Diffraction data show that SnO_(2) is constituted by nanoparticles also, with size of the same order of the W-CdTe QD. The broad bands of the XRD patterns and the Scherrer formula allowed, by assuming a spherical shape, the W-CdTe QD size calculation, which have average diameters in the range 4.8 - 14.0 nm. These data were confirmed by electro...

The present invention is directed to particles prepared by polymerization of compounds containing at least one surfactant and an isocyanate. Pharmaceutical compositions prepared using the particles have also been described as well. .FIELD 1

To prepare and identify Ca nanoparitcles. Methods: The Ca nanoparitcles were prepared by precipitation method at different temperatures, buffers or mixing orders. The structure, particle size and morphology of resulting nanoiparticles were characterized by transmission electron microscope (TEM) , particle meter and X-ray photoelectron spectrometer (XPS). Results: It was indicated that granular nanoparticles average diameter 260 nm could be prepared by adding calcium chloride and dibasic sodium phosphate slowly into sodium citrate at low temperature with stirring. The component of nanoparticles...

The surface increased to volume ratio and number are increased of atoms that are present near the surface compared with micro-/macrostructures are suggested to contribute to the distinctly different properties of nanomaterials.

This commentary discusses the preparation of nanoparticulate systems for commercial development, and the biopharmaceutical and pharmacokinetic advantages of these systems.

Cubosomes posse’s great significance in the field of cosmeceuticals and Pharmaceuticals due to its unique features and become an attractive choice of vehicle for in vivo drug delivery due to their low cost, safety, efficacy and versatility for controlled release application and functionalization.

We demonstrate that the ‘surface-as-ligand, surface-as-complex’ (SALSAC) approach that we have established for annealed nanoparticulate TiO2 surfaces can be successfully applied to nanoparticles (NPs) dispersed in solution. Commercial TiO2 NPs have been activated by initial treatment with aqueous HNO3 followed by dispersion in water and heating under microwave conditions. We have functionalized the activated NPs with anchoring ligands 1–4; 1–3 contain one or two phosphonic acid anchoring groups and 4 has two carboxylic acid anchors; ligands 1, 2 and 4 contain 6,6′-dimethyl-2,2′-bipyridine (Me2...

This article gives an impression of introductory work that took developments till drug delivery, cubosomes types, structure, approaches for development, and fundamentally the uses of cubosome in the formulation from the past in several classes of drugs and pharmaceuticals.

Chiral silver nanoparticles and chiral nanoparticulate films were prepared through the in situ reduction of an organogel formed by a newly designed silver(i)-coordinated organogelsator.

Recently, nanoparticles have become the platform for many sensing schemes. In particular, the utilization of the optical response of nanoparticles to changes in their nanoenvironment has served as a signal transduction mechanism for these sensing events. For example, silver nanoparticle arrays synthesized using nanosphere lithography have served as an ultrasensitive detection platform for small molecules, proteins, and antibodies with the detection limit of 60,000 and less than 25 molecules/nanoparticle for hexadecanethiol and antibodies, respectively. While this approach is low cost and highl...

Nanoparticles whose surface at least one signal molecule is associated, wherein the signal molecule with a transport molecule interacts, so that the nanoparticles (31, 31a) is directed transported by the transport molecule.

The present invention relates to a nanoparticle composition obtained by a method characterized in dissolving a sparingly-soluble compound in water or the like under high temperature and high pressure, and crushing the suspension or the like containing uniform crystals obtained by cooling the obtained solution.

This work was supported by FEDER through POFC – COMPETE and by national funds from FCT through the projects PEst-C/FIS/UI0607/2013 (CFUM). Marlene Lucio holds a position of Researcher FCT with the reference IF/00498/2012. We acknowledge NanoDelivery-I&D em Bionanotecnologia, Lda for access to their equipment.

The aim of this study is to analyze the effect of temperature and NiO content on the asphaltene uptake by a hybrid nanomaterial composed of nickel oxide nanoparticles supported on a nanoparticulated matrix of silica gel. The silica gel nanoparticles were synthesized by sol–gel method. The silica-supported nanomaterial was prepared by an incipient wetness technique. At constant temperature, adsorption of asphaltenes onto the hybrid nanomaterials increased with increasing its nickel oxide content. Regardless of the asphaltene concentration, asphaltene uptake by the hybrid nanomaterials decreased...

Microarray and new high voltage dielectrophoretic devices can be used to rapidly isolate and detect cfc-DNA nanoparticulates and nanoparticles directly from whole blood and other high conductance samples (plasma, serum, urine, etc).

Colloidal suspensions of copper oxide (CuO) nanoparticles were prepared by an alcothermal method, in which copper acetate was reacted with sodium hydroxide in the presence of acetic acid in ethanol at 78°C. The prepared suspension was stable for up to 1 month without stabilizers such as surfactants. Transmission electron microscopy analyses revealed that the suspension contained nanosized CuO particles of 5–10 nm size with a narrow size distribution. Nanoparticulate CuO films packed with grains smaller than 60 nm were fabricated on Si substrates by spin coating a suspension of CuO nanoparticle...

The synthesised silver nanoparticle with sarsaparilla were found to be effective as antimicrobial agents against some important human pathogens like E-coli, Staphylococcus aureus, Bacillus, Klebseilla and also found as a good antioxidant agent.

Quand ses dimensions sont reduites a quelques nanometres, l'or possede des proprietes inegalees en catalyse d'oxydation. En realisant les oxydations selectives d'hydrocarbures a basse temperature (typiquement en dessous de 100 °C), les nanoparticules d'or permettent d'atteindre des selectivites elevees aux memes taux de conversion que ceux habituellement obtenus a plus haute temperature. Ceci est attribue aux modes d'activation de l'oxygene moleculaire sur l'or. En effet, contrairement au platine, l'or ne chimisorbe pas l'oxygene a sa temperature d'operation. En revanche, il semble catalyser l...

Provided are a nanoparticle/dispersant complex having excellent dispersibility and long-term stability in a dispersion medium, a production method therefor, and a nanoparticle dispersion liquid and a nanoparticle/matrix-material complex which are colorless and transparent even at high concentrations. In the nanoparticle/dispersant complex, a nanoparticle is covered with a dispersant containing a heterocyclic cationic group and one of an oxo acid group containing a sulfur atom or a phosphorus atom and an anion moiety of the oxo acid group; in the nanoparticle dispersion liquid, the nanoparticle...

This review concentrated mostly on the classification of nanoparticles, the technique of synthesis, the evaluation of nanop particles, and the list of FDA-approved nanomedicines now available on the market.

Die Anmeldung betrifft ein Verfahren zur Herstellung von Nanopartikeln, die Nanopartikel selbst und deren Verwendung. Nach zumindest einer Ausfuhrungsform umfasst das Verfahren die Thermolyse von mindestens einem Prakursor unter Ausbildung der Nanopartikeln. Der Prakursor ist dabei aus einer Gruppe ausgewahlt, die Polysilane, Polygermane, Polysilagermane, Polycarbosilane, Polycarbosilagermane und Kombinationen hiervon umfasst, und weist Wasserstoff- und/oder Halogen Substituenten auf. Die Nanopartikel umfassen ein wasserstoff- und/oder halogenidhaltiges Halbleitermaterial, das aus einer Gruppe...

The present invention relates to a method for producing metal nanoparticles and metal nanoparticles produced thereby, in particular, to a method for producing metal nanoparticles used for inkjet that comprises, preparing metal nanoparticles capped with a fatty acid; heating a mixture of the capped metal nanoparticles and a linear or branched first amine of C1-C7 so that a part of the fatty acid is substituted to the first amine; and heating after adding a linear or branched second amine of Cs-Co to the mixture so that the first amine is re-substituted to the second amine. According to the pres...

Polarized femtosecond transient absorption spectroscopy and time-resolved polarized emission spectroscopy have been employed to study the spectroscopy and dynamics of charge carriers in GaSe nanoparticles and nanoparticle aggregates. Transient absorptions in the visible and near infrared spectral regions are assigned in terms of a simple effective mass, particle-in-a-cylinder model. A particle size independent, z-polarized hole intraband transition maximizing at 600-650 nm is resolved from a particle size dependent x,y-polarized electron transition involving transfer of electrons from the cond...

In this study, synthesized bimetallic Ni/Fe nanoparticles and zero-valent iron nanoparticles (nZVI) were investigated for remediation of Pb against the effect of various parameters such as pH, volume to mass 2+ (V/m) ratio, contact time, initial concentration of Pb on removal efficiency. Results of the present project 2+

This chapter discusses the evolution of £20m-worth of bonds in the banking industry over the past 50 years.

In various aspects provided are methods for producing a nanoparticle within a cross-linked, collapsed polymeric material, said method including (a) providing a polymeric solution comprising a polymeric material; (b) collapsing at least a portion of the polymeric material about one or more precursor moieties; (c)cross-linking the polymeric material; (d) modifying at least a portion of said precursor moieties to form one or more nanoparticles and thereby forming a composite nanoparticle. In various embodiments, a non-confined nanoparticle can be produced by complete pyrolysis of the confined nan...

Boron is the least understood metalloid of group III in the periodic table that is present in small quantity in the meteoroids however uncombined boron also exists naturally on earth. Besides being an essential micronutrient in human diet, Boron nanoparticles possess high thermal and electrical resistance which makes it suitable to be used in thermoelectric reactors, nuclear reactors and thermal control devices.

A silver - so-called pyrogenic to produce silver nanoparticles by thermal decomposition of the amine complex compound, to provide a process for the preparation of silver nanoparticles is safe and convenient in terms of industrial production that is scaled up . The invention relates to a process for the preparation of silver nano-particles, Aliphatic hydrocarbons amine, a silver compound, were mixed in the presence of an alcohol solvent having 3 or more carbon atoms, to produce a complex compound comprising the silver compound and the amine, The complex compound is heated to by pyrolysis, to fo...

This work conjugated lectins to superparamagnetic Fe3O4 nanoparticles and utilized them for isolation of dying cells from mixed populations and it was shown that influence of alternating magnetic field resulted in the death of cells with bound biofunctionalized nanoparticles.

: © 2017 American Physical Society. Ultrafast pump-probe measurements of plasmonic nanostructures probe the nonequilibrium behavior of excited carriers, which involves several competing effects obscured in typical empirical analyses. Here we present pump-probe measurements of plasmonic nanoparticles along with a complete theoretical description based on first-principles calculations of carrier dynamics and optical response, free of any fitting parameters. We account for detailed electronic-structure effects in the density of states, excited carrier distributions, electron-phonon coupling, and ...

The aim of this paper is to develop Nanomolecules and their types, source, treatment and toxicity.

: © 2017 American Physical Society. Ultrafast pump-probe measurements of plasmonic nanostructures probe the nonequilibrium behavior of excited carriers, which involves several competing effects obscured in typical empirical analyses. Here we present pump-probe measurements of plasmonic nanoparticles along with a complete theoretical description based on first-principles calculations of carrier dynamics and optical response, free of any fitting parameters. We account for detailed electronic-structure effects in the density of states, excited carrier distributions, electron-phonon coupling, and ...

Devising new synthetic routes to nanocrystals (NCs) underpins much of the research activity in this area. Mature synthetic schemes already exist for nanocrystalline noble metals as well as sulfides and selenides of Cd, Pb and Zn. New schemes have therefore focused on synthesising other semiconductors (SCs), in particular avoiding elements generating toxic ions such as Cd, Se and As and avoiding low-availability elements (e.g., In, Te and Ga). Other synthetic schemes have focused on simpler routes, generating tighter distribution of diameters (to aid self-assembly) and dispersing NCs in volatil...

Nanotechnology refers to the creation and utilization of materials whose constituents exist at the nanoscal and by convention by up to 100nm in size. NMs are categorized depending on their size, composition, shape and origin. Due to increased growth of production of NMs and their industrial application, issues relating to toxicity are inevitable. Additionally, the types of toxicity reaction associated with NPs and NSMs are also discussed. Several techniques are used for the preparation of nanoparticles like Dispersion of performed polymers, Polymerization of monomers and Ionic geleation or coa...

본 발명은 저온 플라즈마를 이용한 나노입자 제조방법, 나노입자 및 이를 포함한 전극을 구비한 리튬 전지에 관한 것이다. 상기 나노입자 제조방법에 따르면, 균일한 크기의 나노입자를 제조할 수 있으며, 코어-쉘 구조의 나노입자 제조도 가능하다. 상기 나노입자는 리튬 전지 등과 같은 다양한 소자에 적용될 수 있다. 나노입자 제조방법, 리튬 전지

High coercivity in FePt magnetic nanaoparticles after annealing is the priority of theses systems for application in ultrahigh-density magnetic recording media. Monodisperse FePt nanoparticles were synthesized by superhydride reduction of FeCl 2 .4H 2 O and Pt(acac) 2 at 263 °C under N 2 atmosphere. TEM images show monosized FePt nanoparticles with a diameter of 3.5 nm and a standard deviation of about 10%. The average distance between monodispesre particles is nearly 3nm, which oleic acid and oleylamine surround the FePt nanoparticles as surfactants. Stability of FePt nanoparticles colloidal ...

The relationship between the surface coverage of nanoparticles and the intensity of surface enhanced Raman scattering(SERS) in a two dimensional gold nanoparticulate film was studied. Strong enhancement was observed which is due to the nanoparticle substrate electromagnetic coupling and the contribution of chemical enhancement. It was found that SERS intensity increases linearly at lower coverage, then negatively deflected from the initial line, and finally reach a plateau at increased coverages. We attributed it to the absorption and scattering caused by the neighboring nanoparticles.

Electrodes modified with oppositely charged platinum and gold nanoparticles exhibit electrocatalytic synergy of glucose oxidation. Such a simple method of preparation of bimetallic nanoparticulate films produces an electrode with significant shift of the onset potential as compared to electrodes prepared only from platinum (ca. 0.45 V) or gold (ca. 0.6 V) nanoparticles. The observed effect results from close proximity of the Au and Pt nanoparticles surfaces within the film. The electrode was also characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, powder X-ray diff...

Some general principles obtained from these fundamental studies will serve as guidelines for the design of optimised NP for enhanced cellular uptake and the opportunities for polymer chemists are discussed.

This survey paper highlights the new research directions for nickel-base nanoparticles for future application.

Methods and techniques of overcoming the high conductivity barrier in AC Electrokinetics to isolate nanoparticles are explored and array devices with microelectrodes over-coated with porous hydrogel layers have been found which allow the separation of DNA nanoparticles to be achieved under high conductance (ionic strength) conditions.

The ability of iron oxide magnetic nanoparticles (MNPs) to deliver different types of RNA NPs functionalized with dicer substrate RNAs inside human cells is demonstrated and the nucleic acids in the MNP/RNA NP complexes are protected from nuclease degradation.

The result presented here shows the potential of implementing well-established nanoparticulated gold catalysts with remarkable biocompatibility in cellular biology.

The facile preparation of cell-targeted platinum nanoparticles (PtNPs) is reported through the design of peptides that, as a single molecule added in small concentration during the synthesis, control the size of PtNP clusters during their growth, stabilise the PtNPs in aqueous suspension and enable the functionalisation of the PtPPs with a versatile range ofcell-targeting ligands.

The present invention relates to a method for manufacturing copper nanoparticles and copper nanoparticles thus manufac tured, in particular, to a method for manufacturing copper nanoparticles, wherein the method includes producing mix ture by mixing one or more copper salt selected from a group consisting of CuCl2, Cu(NO), CuSO, (CHCOO),Cuand Cu(acac) (copper acetyloacetate) with fatty acid and disso ciating; and reacting the mixture by heating and copper nano particle.

The present invention discloses a photovoltaic device, nano-particles and nano particles formed. The optoelectronic device includes a light transmitting a first electrode; a first semiconductor layer, said first semiconductor layer is in contact with the first electrode directly electrically; a second semiconductor layer, the second semiconductor layer and the first semiconductor direct electrical contact layer, light absorbing and containing nano particles; and a second electrode, the second electrode contacting the second semiconductor layer is directly electrically, the first semiconductor ...

Polymer nanoparticles have gained significant research interest in increasing number of fields. Various techniques have been used for the synthesis of polymeric nanoparticles including polymerization of monomers as well as dispersion or processing of the synthesized polymers. While performing nanoparticle synthesis, the resulting particle size, distribution, cost, and end use must be considered beforehand. In addition to polymeric nanoparticles, certain hybrid polymeric nanoparticles have been prepared. The hybrid polymeric nanoparticles include the combination of polymer nanoparticles with ot...