Papers:
Synthesis of visible light active nanocrystalline bismuth oxide based photocatalysts
Akurati K.K., Vital A., Reifler F., Ritter A., Graule T., Swiss federal laboratories for materials science & technology, EMPA, CH
Photocatalysis phenomenon has attracted considerable interest in recent years because of its usage in water purification, environmental cleaning, solar energy conversion and generation of alternative energy resources. To date, TiO2 has undoubtedly proven to be [...]
Photochemical Alteration of the Stability of Polymer Nano-Agglomerates
Seipenbusch M., Rothenbacher S., Weber A.P., Salas-Vicente J., Braun A.M., Kasper G., University of Karlsruhe, DE
Interparticle adhesion in the nano-regime leads to undesired stable agglomerates in particulate products. On one hand, the high surface energies of nanoparticles favor the reduction of overall surface area by maximization of the number of [...]
Measuring Nanoparticle Size Distributions in Real-Time: Key Factors for Accuracy
The benefits of sizing aerosolized submicrometer particles using an electrical mobility sizing technique have been well documented. This type of analytical tool has been found to be able to measure particle diameter with an uncertainty [...]
Two-nozzle flame synthesis of tailored Pt/Ba/Al2O3 nanoparticles for NOx storage-reduction
NOx storage reduction (NSR) catalysts are applied for the abatement of NOx from engines operating under lean conditions, where conventional TWC catalysts are inefficient. Here, a novel two-nozzle flame spray pyrolysis (FSP) process was developed [...]
Synthesis and characterisation of flame-sprayed superparamagnetic bare and silica-coated maghemite nanoparticles
Magnetic nanoparticles are a much sought-after entity with direct applications in bioseparation, magnetic resonance imaging (MRI), drug delivery and cancer therapy. gamma-Fe2O3 and SiO2/ gamma-Fe2O3 nanoparticles of different sizes (dBET = 5-50 nm) were synthesised [...]
Mono-component Silicone based Conformal Coating
We will present a UV resin designed to protect printed circuit board. The UV resin is cured by cationic polymerisation and present high performances with advantages such as low viscosity, no need of inertisation during [...]
TiO2:Mn nanoparticles as enhanced UVA absorption, photostable sunscreen components
Conventional sunscreen formulations typically contain, in addition to organic UV absorbers, inorganic nanoparticles such as titanium oxide or zinc oxide. Titanium oxide nanoparticles have significant drawbacks due to a high photoactivity which results in degradation [...]
Additives containing Nano Metal Oxides for enhanced scratch resistance in Coating Formulations
Additives containing Nano Metal Oxides for enhanced scratch resistance in Coating Formulations
Fracture of Vacancy-defected Carbon Nanotubes and Their Embedded Composites
In this paper, we investigate the effects of vacancy defects on the fracture of carbon nanotubes and carbon nanotube/aluminum composites. Our studies show that even a one-atom vacancy defect can dramatically reduce the failure stresses [...]
Noncovalent Catenation between Metal-Ligand Coordination Macrocycles and _-Cyclodextrin
Here we describe our findings on the facile preparation of first [2]catenanes from metal-ligand coordination macrocycles and b-CD ring. The [2]catenane formation is illustrated in Figure 1. Coordination between a divalent ligand and Pd(II) spontaneously [...]
Ultra-thin Nanocomposite Membranes for Highly Sensitive Sensors
Highly sensitive sensor arrays are critical for prospective devices and demanded for various applications. Measuring microscopic deflections with sensitive membranes is one of the most versatile approaches for pressure, acoustic, chemical and biomolecular sensing. Here [...]
A Revolutionary New Method for the Synthesis of a Wide Array of Metal Oxide and Mixed Metal Oxide Nanoparticles with Sizes as Small as 1 nm
Woodfield B.F., Liu Q., Liu S., Liu Q., Liu S., Astle L., Boerio-Goates J., Brigham Young University, US
We have developed a revolutionary new method for the production of large quantities of high-purity metal, metal oxide, and mixed-metal oxide nanoparticles. Particles are uniform in size with dimensions that can range from 1 nm [...]
Condensation and Evaporation of a Nano-sized Particle Moving in a Fluid Environment
Condensation and evaporation of a low temperature nano-sized argon particle moving in a gas/vapor environment was analyzed using the molecular dynamics simulation. First evaporation temperature for various heating rates was found and successfully compared with [...]
Ceramic foams directly-coated with flame-made V2O5/TiO2
Schimmoeller B., Schulz H., Pratsinis S.E., Bareiss A., Reitzmann A., Kraushaar-Czanetzki B., Swiss Federal Institute of Technology (ETH Zürich ), CH
Flame-made airborne V2O5/TiO2 nanoparticles were deposited directly onto mullite foam supports making ready-to-use catalysts for the o-xylene conversion to phthalic anhydride. These particles containing 10 wt.% V2O5 were made by combustion of liquid precursor sprays [...]
Characterization and Synthesis of Platinum Nanoparticles for the Electrochemical Oxygen Reduction Reaction
Elizondo-Villarreal N., Rodríguez Ramírez F., Gochi-Ponce Y., Alonso Núñez G., José Yacamán M., University of Texas, Austin, US
Metallic nanoparticles are of great interest because of the modification of properties observed due to size effects, modifying the catalytic, electronic, and optical properties of the monometallic nanoparticles.The polyol method has been reported to produce [...]
Grinding and Dispersion Equipment For Nano Scale Applications
This paper will address the material science of reducing particles to nano size, highlighting some of the machines and processes that achieve that result. One notable innovation that will be discussed is an inline disperser [...]
Nanoscale Maghemite Iron Oxide Powders Prepared by Laser Pyrolysis
Morjan I., Dumitrache F., Alexandrescu R., Birjega R., Voicu I., Gavrila L., Soare I., Filotti G., Kuncser V., Ciupina V., National Institute for Lasers, Plasma and Radiation Physics, RO
Nano-sized maghemite particles (usually less than 15 nm diameter) have been directly synthesized by the laser induced pyrolysis of iron pentacarbonyl vapors. Ethylene was used as sensitizer of the induced reaction. By the controlled use [...]
Fluorescence of Water-Soluble Fullerenes in Biological Systems
The chemical and photophysical properties of fullerenes have been studied over the past two decades yet the biological applications of these nanoparticles remain limited. The major hurdle of integrating fullerenes with biological systems is their [...]
A Novel Detection of Early Colorectal Cancer by Chitosan Nanoparticles Conjugated with Folic Acid
Yang S.J., Lin F.H., Tsai K-C, Shieh M.J., Institute of Biomedical Engineering, National Taiwan University, TW
The 5-Aminolevulinic acid (5-ALA) can be converted into protoporphyrin IX (PpIX) that can be utilized as a fluorescent probe for tumor detection. In this study, folic acid was conjugated on chitosan molecules via covalent bond [...]
Production of Stable Drug Nanospensions Using Microfluidics Reaction Technology
This paper discusses the advantages to producing aqueous hydrophobic drug nanosuspensions with Microfluidics Reaction Technology.
Preparation and characterization of release behavior for hydrophilic drug loaded alginate nanohydrogels
Lee H.Y., Lee S.M., Lee H.Y., Lee S.M., Kim M.K., Kim Y.M., Kim M.K., Kim Y.M., Sohn S-O, Ghim H-D, Kyungpook National University, KR
Recently, there have been considerable interests in developing biodegradable nanoparticles as effective drug delivery devices. Alginate is one of the hydrophilic natural polymers having biodegradability and biocompatibility. It has possibility to apply in the controlled [...]
Organic-Inorganic Hybrid Sun Blocking Powders Based on Polysilsesquioxane
Trialkoxyorganosilanes containing p-methoxybenzoyl group were sybthesized and polymerized in shapes of spheres. The resulting spherical powder had narrow size distributions and showed promising characteristics as organic-inorganic hybrid UV blocking agents. Regardless of the sizes of [...]
Chitosan-Nanoparticle as UV Filter and Carrier for Cosmetic Actives
Chitosan derivative was prepared by grafting both phthaloyl groups and methoxy poly(ethylene glycol) moieties onto the polymer chain. Nanoparticles of the prepared chitosan derivative were then obtained through solvent displacement technique. The products are stable [...]
A modified plasma arc gas condensation technique for the synthesis of tungsten oxide-based materials with various morphologies and structures
Various nanoproducts including nanoparticles, nanorods, and nanowires have been prepared by a modified plasma arc gas condensation technique. By changing some parameters during the experiment, different kinds of products could be obtained. The results reveal [...]
Prevention of Coalescence Stage from Nuclei at Initial Growth of Thin Film by Substrate Rotation in Physical Vapour Deposition
A method of nanoparticle fabrication in physical vapor deposition was introduced. Metal were deposited on the powdery substrate which were stirred by rotors. Particle size and prodcuction rate of metal nano particles were controlled by [...]
Search of Troponins as Smart Biosensors for Point-of-care Detection of Acute Myocardial Infarction
Troponin molecules and their T, C and I subtypes have shown significance in early point-of-care assessment of acute myocardial infarction. Other slowly released proteins are Creatine kinase MB, Fatty acid-binding Protein and myoglobin. Conventional antibody-antigen [...]
Synthesis and Characterization of Metallic Nanoparticles of Cu, Co and Cu-Co by Reactive Milling
The production of metallic nanoparticles by means of a mechanochemical process is reported. High energy mills are used. The reaction between powders and activated by ball milling involves metallic chlorides and Na in a protective [...]
The Effects of Nano Particles on the Leidenfrost Phenomenon
When small amount of liquid mass is deposited on a hot enough solid surface, the liquid may not evaporate rapidly as we expect. Instead, the liquid mass evaporates slowly with a vapor film beneath. This [...]
Optimization of Magnetic Properties in Cobalt Ferrite Nanocrystals
Cedeño Y., Perales-Perez O., Roman F., Singhal R., Tomar M.S., University of Puerto Rico, Mayaguez Campus, PR
Among the various ferrite materials for magnetic recording applications, cobalt ferrite (CoFe2O4) possesses excellent chemical stability and good mechanical hardness. Furthermore, the large positive first order crystalline anisotropy constant has made this ferrite a promising [...]
Face Selective Adhesion of Gold Nanoparticles onto microcrystal of Cyclodextrin/Octanethiol Inclusion Compound Produced by Magnetron Sputtering
This work describes the self-assembly of stable gold nanoparticles (AuNPs) on microcrystal faces of cyclodextrin inclusion compound (CD-IC). giving as result a supramolecular arrangement (Fig. 1). That was obtained by means of magnetron sputtering technique. [...]
Synthesis and Synterability of Hydroxyapatite-Coated Zirconia Nanopowders
Hydroxyapatite (HAP), Ca10(PO4)6(OH)2, is a well-known and a valuable implant material with biocompatibility and bioactive properties. Full utilisation of the unique properties of hydroxyapatite bulk ceramics is, however, possible only after its proper reinforcement, i.e. [...]
Novel Acrylamide Assisted Polymeric Citrate Route for the Synthesis of Nanocrystalline ZrO2 Powders for Dental Applications
Zirconium oxide has been receiving importance because of its use in wide range of biomedical applications, which is due to its high mechanical strength, fracture toughness and bio-compatibility. Recently, nano structured zirconia powders exhibit enhanced [...]
Low-Temperature Synthesis and Characterization of Fe-Doped ZnO Nanocrystals
We present here our results on synthesis and characterization of bare and Fe-doped ZnO nanocrystals by a modified sol-gel method, which does not require annealing of the samples. Metal acetate solutions in 2-ethylhexanoic acid were [...]
Mesoporous Titanium Dioxide Sphere with Anatase-Type Crystalline Structure using Cyclodextrin as Templates for Nano-sized Pore with Narrow Size Distribution
Mesoporous titanium dioxide (CD-TiO2) sphere with pore diameter in several nanometers and narrow pore size distribution was prepared from beta-cyclodextrin (beta-CD) and titanium precursor via sol-gel reaction in aqueous acidic condition. beta-CD was used as [...]
Experimental and numerical investigations of the influence of fluid dynamics on the precipitation of nanoscaled particles
Precipitation depends on competing kinetics of various interacting parallel and subsequent steps. These are mixing, chemical reactions, nucleation, growth, aggregation and stabilization. The coupling of all subprocesses is the key for predicting the PSD. In [...]
preparation of Reactive Polymeric Nanoparticles (RPNPs)
Synthesis of polymeric nanoparticles attracts a great effort to obtain particles with desired size, surface and functionalities. Crosslinking polymerization methods have received considerable interest relation to the development of preparation of microgels, crosslinked nanoparticles, their [...]
From nanopores to nanoshells: The transformation of MCM-41 into ultrathin wall, hollow silica nanospheres
This work describes the preparation of ultra-small and ultra-thin hollow silica nanospheres from mesoporous MCM-41. The partially converted MCM-41, which retained the silhouette of the original MCM-41 particle, but is severely riddled with holes from [...]
Scale up production of nanoparticles using hydrothermal synthesis
This paper shows how continuous hydrothermal synthesis can be scaled up for commercial scale production using a patented reactor design. There are severe limitations with most nanomaterial manufacturing methods not excluding hydrothermal synthesis. Hydrothermal synthesis [...]
Prediction Model of Thermal Conductivity for Composite Materials with Nano Particles
In this study, the transport theorem of phonons and electrons is utilized to create a model to predict the thermal conductivity of composite materials with nano particles. By observing or assuming the particle displacement in [...]
Structural Properties of Amorphous Al2O3.2SiO2 nanoparticles
Structural properties of amorphous Al2O3.2SiO2 (AS2) spherical nanoparticles have been studied in a model with different sizes of 2nm, 3nm, 4nm and 5nm under periodic boundary conditions with the Born-Mayer type pair potentials [1,2] via [...]
Amorphous-Amorphous Phase Transition in Simulated Amorphous SiO2 Nanoparticle
Via Molecular Dynamics simulation we found the transition from low density to high density states in an amorphous SiO2 nanoparticle under compression from 2.20 g/cm3 to 5.35 g/cm3. Simulations were done in a spherical model [...]
Characterization of CdSe Nanocrystals and their Interaction with Micellar Aggregates by Means of Capillary Electrophoretic Techniques
Characterization of nanocrystals is crucial for the development of many chemical methods based on this technology. For this, there are several techniques, mainly microscopic, and recently capillary electrophoretic techniques, that have been proposed. In our [...]
Effect of Reaction Temperature on the Structural and Optical Properties of Zno Nanocrystals
Parra-Palomino A., Sotomayor C., Perales-Perez O., Singhal R., Voyles P., Tomar M.S., University of Puerto Rico, PR
The present research addressed the size-controlled synthesis of ZnO nanocrystals at different temperatures. In order to study systematically the dependence of crystal size with synthesis conditions in ethanol, stable suspensions of these nanocrystals were produced [...]
Zinc Sulfide and Cadmium Sulfide based Nanocrystals and Shells
Balaguera M., Perales-Perez O., Rivera-Montalvo L., Singhal R., Tomar M.S., University of Puerto Rico, PR
The objective of the current research is to synthesize CdS, ZnS nanocrystals through a two phases-method were quantum dots moved from the aqueous phase to the organic one after proper coating of the particles by [...]
Experiments on removing nano particles on a substrate using a supersonic particle beam
Cryogenic particle beam can be an effective means of removing nano-sized contaminant particles from a substrate surface. In order to generate a particle beam of high intensity and controlled size and temperature, Argon gas was [...]
Fabrication of microcomponent using Fe based nanopowders
The metallic microcomponents were fabricated by pressureless sintering of nano-sized pure Fe and 17-4 PH stainless steel nanopowders. The compacting and sintering behaviors of nanosized Fe powders have been evaluated and compared with those of [...]
Direct Laser Writing of Microtunnels and Reservoirs on Nanocomposite Materials
Using the efficient photon—thermal energy conversion property of gold nanoparticles, a direct laser writing method has been developed for the fabrication of microstructures including microtunnels (see figure), holes, and reservoirs on nanoparticle/polymer composite thin films. [...]
New process for fabrication of microcomponents using metal nanopowder
We developed a new process to manufacture a soft mould for the small parts using two kinds of polymer, SU-8 for a master mould and Polydimethylsiloxane (PDMS) for a soft mould and produced the small [...]
Reversible Formation of Silver Nanoparticles in Poly(vinyl alcohol)-Based Thin Films via Electrochemical Switching
Ag particles with nanometer dimensions were generated reversibly in the presence of air within micron-thick polymer films using electrochemical techniques.
Synthesis of Water Soluble Gold Nanoparticles and Adsorption of Dyes onto Gold Nanoparticles
The synthesis of gold nanoparticles was performed by the Turkevich method. The effect of adding various dyes to gold hydrosols was investigated. It was found that the U. V. absorption characteristics of the dyes change [...]
Nonlinear Optical Property of Gold nanoparticles/Polymer Hybrid Materials
The ability to control the assembly of nanoparticle building blocks is very important in the development of new nanostructured materials and devices. It is well known that the properties of nanostructured materials are not only [...]
Comparison of Heat Transfer and Fluid Dynamic Performance of Nanofluids
Many recent studies have shown that nanofluids with metallic nanoparticles as suspension increase the thermal conductivity of base fluid by a substantial amount. Research on copper oxide (CuO) nanoparticles in water has revealed that a [...]
Fabrication of CuO Nanofilm preparation by Electrophoretic Deposition
This paper uses electrophoretic deposition for coating a self-fabricated CuO nanofluid on a stainless steel substrate and measures the nature of this nanofilm. The pH value of the fabricated CuO nanofluid is 6.0, with a [...]
Single dot luminescence characteristics of CdSe/ZnS core-shell structured quantum dots with different ligands
Chemical derivatizations with different ligands were perfomed on CdSe/ZnS core-shell quantum dots (QDs). The role of ligands serves to increase water solubility and bio-compatibility of QDs for in-vivo biomedical fluorescence imaging. These QDs were synthesized [...]
Application of Anderson-Schulz-Flory (ASF) equation in the proiduct distribution of slurry phase FT synthesis with nanosized iron catalyst
Application of Anderson- Schulz- Flory (ASF) Equation in the Product Distribution of Slurry Phase FT Synthesis with Nanosized Iron Catalysts Akram Tavakoli Araghi, Morteza Sohrabi∗ , Ali Kargari AmirKabir University of Technology , Faculty of [...]
Enantiospecific adsorption of chiral molecules on chiral Au nanoparticles
Enantioselectivity in gold clusters is investigated by studying the adsorption of a chiral amino acid (cysteine) on a chiral Au55 cluster using density functional calculations. The highest adsorption energies were found when the amino and [...]
The use of Molecular Precursors for the Preparation of Pd/Co-Alloy Nanoparticles
The preparation of catalysts from molecular precursors is the main objective of our research. The predetermination of metal composition in molecular precursors is an advantage of this method over others (e.g. co-precipitation). The main objective [...]
Shape-Controlled Synthesis and Catalytic Behavior of Supported Platinum Nanoparticles
A 5% Pt/C catalyst with ~20 nm cubic platinum particles was prepared using a traditional preparation method (i.e. precursor impregnation, calcination, and reduction) and choosing a hydrophobic solvent in the impregnation procedure. These 20 nm [...]
Poly(vinyl amine) Stabilized Colloidal CdS Quantum Dots of Color-Tunable Photoluminescence: Syntheses and Optical Properties
The colloidal CdS QD solutions were prepared with PVAm as the stabilizing polymer in a mixed solvent composed of methanol and water. The emitting colors of the prepared CdS QD colloids are tunable by varying [...]
Slurry sample injection for determination of ferrite nanocolloids chemical composition by ICP spectrometry
Sousa M.H., Lins E.S., Tourinho F.A., Depeyrot J., Martins W.D., Zara L.F., Castro C.F.S., de Castro G.R., Universidade de Brasilia, BR
In the biomedical field, some applications of nanomaterials require dynamically quantifying them in blood and tissues probes. Nevertheless, the usual methods which are employed to titrate the nanoparticles require their dissolution before the chemical analysis, [...]
Magnetic Properties of Multi- and Sigle-Domain Particles of CuxNi1-xFe2O4 Ferrites
The crossover effect from multi- to single-domain particles on the magnetic properties of CuxNi1-xFe2O4 oxides due to grain size reduction to nanometre scale is investigated. The properties of the bulk and nanosized oxide have been [...]
Magnetic characteristics of FePt nanodots formed by a self-assembled nanodot deposition method
Yin C.K., Choi H., Bea J.C., Murugesan M., Yoo J-H, Fukushima T., Murakami Y., Tanaka T., Shindo D., Miyao M., Koyanagi M., Tohoku University, JP
FePt nanodot with L10 fct structure has attracted considerable attention owing to its potentials for new applications. FePt nanodots dispersed in a SiO2 film (FePt nanodot film) were formed by a self-assembled nanodots deposition (SAND) [...]
Synthesis and Characterization of Magnetite Powders
Low-cost magnetic powders have been synthesized by Headwaters Technology Innovation Group. These powders exhibit a strong magnetic susceptibility mainly due to magnetite formation. The potential applications for this product range from cancer treatment, ferrofluids, to [...]
Low-Temperature Polyol Synthesis of Nanocrystalline Co and CoPt Alloys
Chávarri-Pajares E., Pérez J., Perales-Perez O., Singhal R., Tomar M.S., University of Puerto Rico, PR
The strong size-dependent magnetic properties of transition metal nanocrystals can be used to estimate the scaling limits of magnetic storage, a key component of information technology. High Ku (magnetocrystalline anisotropy constant) materials become then very [...]
Poly(acrylic) acid-coated Silver Nanoparticles for Antibacterial Textile Finishing
Falletta E., Bonini M., Fratini E., Lo Nostro A., Lo Nostro P., Becheri A., Lo Nostro A., Lo Nostro P., Baglioni P., University of Florence, IT
The synthesis of silver nanoparticles was obtained through two different methods and using different poly(acrylic) acids as templating agents. Cotton, wool, and polyester fabrics were treated with the nanoparticles, and their antimicrobial performances were tested [...]
Transforming nano-science to nano-technology: Manipulating the size, shape, surface morphology, agglomeration, phases and defects of silver nano-particles under continuous flow conditions
Spinning disc processing (SDP) is an instantaneously scalable, continuous flow and high throughput flash nano-fabrication technology which embraces green chemistry metrics. It has been used to prepare silver nano-particles with remarkable control in size (5 [...]
Assemblies of Blue-emitting CdSe Nanocrystals in Redox Copper Phenanthroline-based Polymeric Chains
Assemblies of quantum-confined semiconductor nanoparticles into block copolymer micelles and silica shell open the door to “tunable” optical, electrical, and even mechanical properties. Sharp tuning of 3D spherical morphology in water solution is a fascinating [...]
Nano-Biotechnology toward Diagnostic Industry: Obstacles and Opportunities
Biosensing of infectious agents should be ideally real-time, multiplexed, sensitive and specific. While no single device thus far have demonstrated superiority with respect to all these qualities, many of the upcoming nanomaterial-based sensors described in [...]
Interesting applications on a novel high pressure high temperature microfluidic-based flow reactor
Performing hazardous reactions at high pressure and high temperature in a safer and faster manner have always attracted great attention in the chemical industry. Recently, a new member of the Thales CubeTM micro-flow reactor series [...]
Journal: TechConnect Briefs
Volume: 4, Technical Proceedings of the 2007 NSTI Nanotechnology Conference and Trade Show, Volume 4
Published: May 20, 2007
Industry sector: Advanced Materials & Manufacturing
Topic: Nanoparticle Synthesis & Applications
ISBN: 1-4200-6376-6