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Showing 1 to 20 of 20 for “"colloidal dispersion"”.
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Study on the Nanocomposite Underfill for Flip-Chip Application
Underfill material is a special colloidal dispersion system with silicon dioxide particles in the organic liquid. It is used to improve the reliability of integrated circuits (IC) packaging in the microelectronics. In order to successfully synthesize the nanocomposite underfill meeting the …
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Investigation of Hydrodynamic and Depletion Interactions in Binary Colloidal Dispersions
Within a colloidal dispersion, the presence of negatively adsorbing material can produce a variety of effects on the dispersion properties and interactions. With increasing concentration, the negatively adsorbing material induces both depletion and structural forces on the dispersion, which can …
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On the theory of Brownian aggregation in colloidal dispersions
… aggregation kinetics is a topic of interest for colloidal dispersions, macromolecular fluids, nanoparticle self-assembly, and biochemical reactions. The manipulation of colloidal dispersion stability by containing or promoting aggregation rates is manifest in several natural phenomena and …
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Development of particle-based systems for the delivery of oligonucleotides into primary dendritic cells
… O10H6 and ODN complexation and remains a colloidal dispersion upon addition of condensates. Nanoparticles of poly (d, l-lactide-co-glycolide) are biodegradable particulates that provide the ability to entrap O10H6-ODN condensates and protect DNA. These particles loaded with DNA condensates …
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An experimental study of the magnetic linear birefringence and dichroism of liquids, solutions and dispersions
… fields In molecular liquids, solutions and colloidal dispersions. The measurements were made using apparatus of greater sensitivity than any previously described; most results were new determinations. The liquids were mostly linear and branched alkanes, or alkane derivatives, generally being …
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The investigation of interactions between single walled carbon nanotubes and flexible chain molecules
… employed for this purpose. In addition to colloidal stability, such polymers can control surface adsorption, aggregation and in some instances, select particular diameters or chemical species for stabilization. A central challenge is how to predict the ability of a polymer to adsorb and …
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A novel integrated platform combining atomic force microscopy and fluorescence correlation spectroscopy
… was the platform was demonstrated by employing a colloidal liquid as a test system. Results of AFM experiments indicated the presence of structure to the colloidal dispersion under confinement, similar to the behavior of molecular liquids reported in the literature, at length scales of a few 10 …
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Aqueous poly(arylene ether ether ketone) suspensions
Aqueous dispersion pre-pregging is under investigation within our laboratories for processing fiber reinforced, polymer matrix composites with environmental concern by using water instead of toxic organic solvents. This method requires that the polymers be in the form of a stable aqueous colloidal …
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Screening guidelines and data analysis for the application of in-situ polymer gels for injection well conformance improvement
… well gel technologies including bulk gels, colloidal dispersion gels, and weak gels. Comparative analysis, statistical methods, and a machine learning technique were utilized to develop a conformance agent selection advisor that consists of a standardized selection system, conventional …
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Structure-Morphology-Property Relationships in Perfluorosulfonic Acid Ionomer Dispersions, Membranes, and Thin Films to Advance Hydrogen Fuel Cell Applications
… a roll-to-roll process that involves casting a colloidal dispersion of the fuel cell ionomer in predominantly mixed alcohol/water solvent systems onto a backing film or substrate, followed by evaporation of the solvent and annealing of the ionomer at elevated temperatures. The current benchmark …
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Phase-equilibrium-mediated assembly of colloidal nanoparticles
Colloidal dispersion of nanoparticles (CNPs) has interesting properties both in terms of fundamental studies and industrials applications. Particular focus on the phase equilibrium and separation dynamics of CNPs has been necessary for understanding how exactly and fast CNPs are assembled and for …
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Silicon nanocrystals: from bio-imager to erbium sensitizer
… agent have been investigated by employing colloidal dispersion of individual silicon nanocrystals where surface properties could be controlled to a great extent. By using a suitable functionalization scheme, high quality hydrophilic luminescent nanoparticles were produced. Using the …
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Intelligent Nano/Microgels for Cell Scaffold and Drug Delivery System
… for the cell scaffold, it can be realized by colloidal supra-structure microgels, which constructed by the thermo-driven gelation of the colloidal dispersion of poly(N-isopropylacrylamide-co-acrylamide) poly(NIPAM-co-AAm) microgels (Chapter 3). Such microgels exhibit a reversible and …
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EXPERIMENTAL AND MODELING STUDIES OF COLLOIDAL SUSPENSION STABILITY OF HIGH-DENSITY PARTICLES IN AQUEOUS SOLUTIONS
Agglomeration and sedimentation of suspended colloidal particles occur in many natural phenomena, in consumer products, and in engineering applications. Stabilized colloidal pigment dispersions were used in ancient Egypt and in ancient France thousands of years ago. Present day applications include …
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Adsorption in Confined Aqueous Films
… it is through adsorption that the stability of colloidal suspensions is frequently tuned. The vast majority of measurements of adsorption to date have been to a single interfaces, whereas the subject of this thesis is adsorption in a thin film between two interfaces. There are two isolated …
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Development and Implementation of Dispersion Phase Diagrams (DPDs) for Four Different Hydrophobically Modified Ethoxylated Urethane (HEUR) Based Acrylic Paint Systems
… paints and coatings. A latex is an aqueous colloidal dispersion of polymer particles that when dried above the polymer’s film formation temperature coalesces into a dry polymer film (Dragnevski, Routh, Murray, & Donald, 2010). The other main components of paint include associative …
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Novel Rheometric Techniques and Constitutive Models for Linear and Nonlinear Rheology: Applications to Polymeric Solutions and Colloidal Gels
… spectra, and mutating material systems such as colloidal gels that may exhibit age-dependent viscoelastic properties. Similarly, characterizing the rheological properties over the full range of time or frequency scales relevant to their use can be challenging, especially if the material …
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Polymer Stabilized Magnetite Nanoparticles and Poly(propylene oxide) Modified Styrene-Dimethacrylate Networks
… methodology for stabilizing nanomagnetite dispersions using well-defined, non-toxic, block copolymers, so that the resultant magnetite-polymer complexes can be used in a range of biomedical materials. Hydrophilic triblock copolymers with controlled concentrations of pendent carboxylic acids …
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GLUCOSE ELECTROOXIDATION
… prepared by depositing gold nanoparticles from a colloidal dispersion (sol) onto different carbonaceous conductive supports: glassy carbon, carbon cloth and graphite paper. The gold sol was prepared reducing an aqueous solution of tetrachloroauric acid with sodium borohydride. The gold particles …