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Showing 1 to 20 of 207 for “"monodisperse"”.
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Nanophase separation in monodisperse rodcoil diblock polymers
… Each macromolecule consists of a rigid and monodisperse rodlike segment covalently attached to a flexible coillike segment of narrow molecular weight distribution such that both segments share the same molecular backbone. By transmission electron microscopy (TEM) of solution-cast thin films …
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Network morphologies in monodisperse and polydisperse multiblock terpolymers.
… morphologies were previously identified in “monodisperse” (polydispersity index (PDI) < ~1.1 in all blocks) poly(isoprene-bstyrene- b-ethylene oxide) (ISO) triblock terpolymers. This work extends the investigation of multiply continuous network structures to two other classes of multiblock …
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Synthesis of monodisperse silver nanoparticles for antibacterial purposes
… of chemical addition were varied to produce monodisperse silver nanoparticles with an average size of smaller than 10 nm. This study also aimed to investigate the antibacterial efficacy of silver nanoparticles deposited on quartz fibre filters against E. coli. Two silver nanoparticle …
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Investigation of protein destabilization in monodisperse poly(lactide-co-glycolide) microparticles
Poly(lactide-co-glycolide) (PLG) microspheres are a powerful choice for controlled release of protein therapeutics. However, several properties of PLG microspheres, particularly hydrophobicity and acidic microenvironment, may have detrimental effects on encapsulated protein, causing structural …
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Synthetic routes to monodisperse gold nanoparticles stabilized by different-length alkanethiols
… different synthesis routes toward obtaining monodisperse clutches of well-ordered nanoparticles stabilized by various alkanethiols. The first two synthesis methods were based on a two-phase system employing first tetraoctylammonium bromide (TOAB) as a phase transfer catalyst and then …
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The synthesis, interfacial electrochemistry, ordering, and sintering of monodisperse TiO2 powders
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1983.
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Synthesis and characterisation of hollow monodisperse silica-titania nanostructures for potential use in targeted delivery of drugs/vaccines/genes
In recent years, there has been a continuous growth in pharmaceutical formulations based on nanoparticle technology. Although a large number of nanocarriers have been studied, most of them are limited by their ability to carry sufficiently viable therapeutic loads, toxicity, and target specific …
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Inductively coupled plasma mass spectrometry with a twin quadrupole instrument using laser ablation sample introduction and monodisperse dried microparticulate injection
… using the twin quadrupole ICP-MS with monodisperse dried microparticulate injection (MDMI). At modest Pb concentrations (500 ppm), a shoulder on the leading edge of the Li+ signal appears. At higher matrix concentrations (1500 ppm), a dip in the leading edge of the Li+ signal becomes …
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Part I: Strategies for the Synthesis of Monodisperse Polymers and Cyclic Polymers. Part II: Synthesis of Dipyrromethenes and Aza-dipyrromethenes from Aromatic Nitriles
… leads into the first homogenous synthesis of monodisperse polymers. Through cycling between low and high temperatures and carefully controlling monomer activation, we show that it is possible to add exactly one monomer per temperature cycle to each chain in solution, resulting in monodisperse …
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The Rheology and Microstructure of Dense Bimodal Mixtures of Colloidal Particles With Long-Range, Soft Interactions
… of the mixtures is remarkably similar to the monodisperse suspensions for most applied shear stresses. Yield stresses and the general flow curves for all mixtures studied followed the same scaling on the elastic modulus as the monodisperse suspensions. The mixtures display substantial …
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Concentration profiles at amorphous polymer-polymer interfaces
… Rouse and reptation dynamics for the symmetric monodisperse and polydisperse interfaces, the asymmetric monodisperse interface, the symmetric blend interfaces, and the asymmetric interfaces of two different polymers. The profiles obtained are used to study the properties of corresponding …
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Charge carrier dynamics in lead sulfide quantum dot solids
… the ensemble size dispersity and the creation of monodisperse quantum dot ensembles with size variations of less than one atomic layer. Quantum dots have been used in a variety of applications including solar cells, light-emitting diodes, photodetectors, and thermoelectrics. In many of these …
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Structure-Property Relations in Bubble and Solid Particle Suspensions with Moderate Reynolds Numbers
… velocity and microstructure in suspensions of monodisperse, spherical, non-coalescing bubbles, and the lift force on bubbles in a sheared suspension. In order to simulate suspensions of monodisperse, spherical, non-coalescing bubbles, a lattice-Boltzmann boundary rule was designed. On the last …
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Energy absorption of reticulated foams filled with shear-thickening silica suspensions
… of 1.7 ± 1.4 micrometer, while the second are monodisperse spherical particles of 0.3 ± 0.03 micrometer diameter. The particles are dispersed in ethylene glycol at volume fractions of up to [phi]=47% for the polydisperse sample and up to [phi]=60% for the monodisperse spheres. The behavior of …
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Granular Collapses
… the simplest case of a cylindrical mass of a monodisperse material of approximately spherical grains flowing over a horizontal base. By applying new measurement techniques we find differences with previously reported results. We then extend the problem to the bidisperse case by using layers of …
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Study of dynamics of airflow and aerosol transport and deposition in human upper airways using large-eddy simulations
… cyclic breathing scenario. Under steady flow, monodisperse (1–10 μm) and polydisperse aerosols are analyzed. The study shows that complex airflow dynamics directly influence aerosol transport and deposition, causing global deposition to increase nonlinearly with particle size and Reynolds …
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Exploration of a template-directed approach for the synthesis of silver nanoparticles
… triazole ligands to template the formation of monodisperse AgNPs in a size- and shape-controlled manner. Chapter 1 introduces the optical properties of metal nanoparticles and the common methods for the preparation of AgNPs, highlighting the limitations of typical methods and the motivations of …
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Numerical simulation of fluid flow through porous media using the immersed boundary method
… of the geometric parameters, collapses onto the monodisperse data with proper scalings, and the monodisperse data can be then fitted with a universal prediction curve. The effect of the Reynolds numbers in the inertial flow regime has also been studied. The inertial effect at moderate Reynolds …
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Elektronische Kommunikation auf molekularer Ebene : Aufbau und Untersuchung höherer Phenothiazin-Oligomere und -Polymere
… von elektronoisch aktiven Phenothiazinsystemen: Monodisperse Phenothiazinoligomere und Phenothiazin-Ferrocen-Hybridoligomere, Polymere und Copolymere und Donor-Akzeptorsysteme. Die Synthese der Zielverbindungen erfolgte über ein Baukastensystem aus unterschiedlich substituierten …
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