Vers l'interprétation de l'effet Goldreich-Kylafis pour la mesure des champs magnétiques
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Shear-induced fragmentation of Laponite suspensions
Simultaneous rheological and velocity profile measurements are performed in a smooth Couette geometry on Laponite suspensions seeded with glass microspheres and undergoing the shear-induced solid-to-fluid (or yielding) transition. Under these slippery boundary conditions, a rich temporal behaviour is uncovered, in whi…
Counterions release from electrostatic complexes of polyelectrolytes and proteins of opposite charge : a direct measurement
Though often considered as one of the main driving process of the complexation of species of opposite charges, the release of counterions has never been experimentally directly measured on polyelectrolyte/proteins complexes. We present here the first structural determination of such a release by Small Angle Neutron Sc…
Výskum výbojových procesov vo vzduchu v silne nehomogénnom elektrickom poli
Abstrakt. Tato praca je zamerana na výskum charakteristik elektrickeho výboja v plynnom prostredi v silne nehomogennom elektrickom poli, pricom ako plyn je použitý vzduch. Silne nehomogenne pole vytvara sa pomocou systemu elektrod typu hrot-doska. Elektrický výboj sa generuje pomocou generatora impulzov napatia s nast…
Low-energy electron diffraction effects at complex interfaces
Low-energy electron scattering was used as a tool to study electron-stimulated processes at complex interfaces. The electron diffraction in each complex interface is theoretically treated by a multiple scattering formalism for quantitative analysis. Mathematical descriptions of electron-stimulated processes and a mult…
Biomedical applications of cobalt-spinel ferrite nanoparticles for cancer cell extraction and drug delivery
In this presentation it is demonstrated that the unique magnetic properties of superparamagnetic cobalt-spinel ferrite nanoparticles can be employed in several novel applications. A method to selectively capture and remove pathogens from infected organisms to improve longevity is presented. Evidence is provided to sho…
Implicit spatial averaging in inversion of inelastic x-ray scattering data
Inelastic x-ray scattering (IXS) now a widely used technique for studying the dynamics of electrons in condensed matter. We previously posed a solution to the phase problem for IXS [P. Abbamonte, et. al., Phys. Rev. Lett. {\bf 92}, 237401 (2004)], that allows explicit reconstruction of the density propagator of a syst…
Alternative States of Amoebae
Actively proliferating Amoebae were kept in the interphase part of the cell cycle for prolonged periods by restricting the food supply. When the cells were returned to normal food supply, the clones failed to grow exponentially. The clones in this period of growth phase were in an 'alternative state' as opposed to the…
Stripe to “spin-quantum well” formation and collective spin reorientation in self-assembled Ni nanomagnets on GaN
We report domain formation and spin phase transition in annealing induced self-assembled Ni nanodots on GaN with size distribution greater than the exchange length. The as-deposited Ni film shows stripelike magnetic domains. The enclosed spin well phase occurs due to annealed induced structural transition in the films…
Preparation and Characterization of Melt Grafting 2-acrylamido-2-methyl-1-propanesulfonic Acid onto Pre-Irradiated Linear Low Density Polyethylene
Linear low density polyethylene (LLDPE) was functionalized with 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) by using β -ray pre-irradiation in air in a twin-screw extruder. Fourier-transformed infrared spectroscopy (FT-IR) and electron spectroscopy for chemical analysis (ESCA) were used to characterize the for…
REGULATORY MECHANISMS OF SLC39A4 (ZIP4) AND SLC39A5 (ZIP5) IN THE ADAPTIVE RESPONSE TO ZINC AVAILABILITY
The aims of this research were to determine how Zip4 and Zip5 are regulated in response to zinc availability and how Zip4 impacts development. Loss of Zip4 resulted in embryonic lethality. Heterozygosity negatively affected eye, heart, and brain development. Excess zinc did not rescue lethality but ameliorated the het…
Efeitos de temperatura sobre a mobilidade de portadores de carga em polímeros condutores
In the last decades, conjugated polymer use has been increased in the electronic devices industry due to the advantages — such as high maleability, controlled conductivity and low price — these materials present. It is a well known fact that charge carrier mobility consists in an essencial quantity when it concerns de…
Support pour groupe électrogène
Support coulissant pour generateurs et autres appareils, egalement utilisable comme support pour le materiel Syncro. Dispose d'un mecanisme automatique de blocage, que ce soit pour le laisser completement ouvert ou ferme. Fabrique avec le systeme “CUT-THROUGH” pour reduire le poids. Avec glissiere telescopique a bille…
Rat bladder muscle regeneration induced by local delivery of an engineered insulin-like growth factor 1 in fibrin gels
Currently, both congenital abnormalities and developmental problems of the bladder in children, and other dysfunctions in adults, require reconstructive surgery. Such correction involves transplant action of native tissues (such as gastrointestinal segments, or mucosa), homologous tissues from a donor, heterologous ti…
Microscopic and spectroscopic studies of growth and electronic structure of epitaxial graphene
It is generally believed that the Si technology is going to hit a road block soon. Amongst all the potential candidates, graphene shows the most promise as replacement material for the aging Si technology. This has caused a tremendous stir in the scientific community. This excitement stems from the fact that graphene…
Tailoring the visible photoluminescence of mass-produced ZnO nanowires
We have grown defect-rich ZnO nanowires on a large scale by the vapour phase reaction method without using any metal catalyst and vacuum system. The defects, including zinc vacancies, oxygen interstitials and oxygen antisites, are related to the excess of oxygen in ZnO nanowires and are controllable. The nanowires hav…
Role of range of interactions in a model of diffusing charged particles
Role of range of interactions in a model of charged particles diffusing on a two-dimensional lattice is studied. We investigate, via Monte Carlo simulations, three models. In the first one interactions are restricted to nearest neighbors, in the second one we add (weaker) interactions to second nearest neighbors. In t…
Acquisition of a Combined Mechano-Electro-Chemical Characterization Equipment for Advanced Nanocomposites Research and Education
Abstract : We have acquired a custom-designed Nanonics Multiview 400 Combined microRaman, Scanning Probe Microscope (SPM), and Nanoindenter system. Such combined system integration permits correlation of SPM topography of a sample surface with microRaman spectra. The Nanonics SPM/NSOM component generates surface morph…
MOLECULAR DESIGN OF COLLOIDS IN SUPERCRITICAL FLUIDS
The environmentally benign, non-toxic, non-flammable fluids water and carbon dioxide (CO2) are the two most abundant and inexpensive solvents on earth. Emulsions of these fluids are of interest in many industrial processes, as well as CO2 sequestration and enhanced oil recovery. Until recently, formation of these emul…
Micromechanics of Damage Accumulation in Micro- and Nano-Scale Laminates for Microelectromechanical Systems
The experimental mechanical behavior research in this program was driven by the