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Showing 1 to 20 of 29 for “"Colloidal Crystals"”.
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Silica Colloidal Crystals As Emerging Materials For The High-Throughput Sizing Of Proteins By Packed Capillary Electrophoresis
… to these issues involves the use of silica colloidal crystals bearing brush layers of polyacrylamide. Using established correlations between molecular weight and reduced mobility, selectivity is compared in silica colloidal crystals and gels. Due to low broadening effects in colloidal …
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DNA Hybridization and Ligation for Directed Colloidal Assembly
Another conventional method of colloidal assembly we pursued was sedimentation via slow centrifugation. The salt requirement for DNA hybridization and ligation made it necessary to use slow salt addition through a dialysis membrane to achieve well-ordered colloidal crystals. Well-ordered …
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Surface Modification and Self-Assembly of Gold Nanostructures
… nanoparticles and nanorods into well organized colloidal crystals. Slow precipitation technique was implemented to prepare three dimensional colloidal crystals of alkanethiolated gold nanoparticles. Colloidal crystals of gold nanorods were prepared by evaporation induced self -assembly …
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Direct-write assembly of colloidal materials
Colloidal assembly, which is the spontaneous organization of nano- and micro- sized particles, is an attractive means to create materials with properties that can be engineered via hierarchy of particle composition, size, ordering, and macroscopic form. However, while there are well-established …
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Controlling Microbial Colonization and Biofilm Formation Using Topographical Cues
… 3D biofilms rarely occur on a solid with a colloidal crystal coating of 1550 nm spheres. On 450 nm colloidal crystals, the bacterial growth was intermediate between the flat and 1550 nm spheres. The initial preference for P. aeruginosa to adhere to confined spaces is maintained on the second …
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Click chemistry for colloidal assembly
… (CuAAC) to develop an approach for directed colloidal assembly. Colloidal crystals are used here as an ideal model system for studying directed self assembly. This study develops a modular approach towards colloidal assembly in which click chemistry is employed as an assisting agent via a …
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Functional Microperiodic Polyacrylamide Gels Fabricated by Opal Inversion and Direct-Write Processes
… inversion of self-assembled monodisperse colloidal crystals which yields an inverted FCC lattice of polymer, and direct ink writing (DIW) in which a continuous filament is patterned layer-by-layer into a defined structure.
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Fabrication of Three-Dimensionally Ordered Nanostructured Materials Through Colloidal Crystal Templating
The void spaces in colloidal crystals (opals, three-dimensional (3D) close-packed arrays of silica nanospheres) and their replicas are used as templates in the fabrication of new nanostructured materials. 3D ordered nanomeshes and nanosphere arrays are readily obtained by chemical and/or …
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Unique templating of and applications enabled through mesoporous colloids
… enabled by utilizing mesoporous colloids, colloidal crystals, and films. Silica colloidal crystals, having colloids of less than 300 nm, were fabricated and used as a template for silicon deposition. Brillouin Light Scattering (BLS) experiments conducted on a silicon templated silica …
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Evaporation-Driven Assembly as a Route to Photonic Materials
… diffraction properties of photonic crystals have inspired their proposed use in applications ranging from chemosensors, to solar power applications, to optical computing devices. The range of proposed applications for photonic crystals demands a range of techniques for fabricating …
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Thermal, electrical and mechanical properties of three-dimensional functional materials
Colloidal assembly is a dynamic phenomenon where the particulates dispersed in fluids, with the size over tens of nms to several μms, form into specific spatial organization resulting from the variations in the surroundings. The general hard sphere colloids with charged surfaces can be …
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New inverse hydogel opals as protein responsive sensors
… glass slides as the first step. The obtained colloidal crystals with a thickness of 5 μm displayed opalescent reflections because of the uniform alignment of the colloids. As a second step, the template was embedded in a matrix consisting of biocompatible, thermoresponsive hydrogels. The …
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Assessment of colloidal self-assembly for photonic crystal
… interest on the implementation of photonic crystals, which have practical applications in reflectors, filters, resonators, and waveguides. In this thesis, self-assembly of colloidal crystals and photonic crystal technologies are reviewed. Potential colloidal photonic and non-photonic devices …
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Synthesis and Crystallization of Anisotropic Polymer Colloids
… behavior, with spherocylinders forming plastic crystals and orientationally ordered crystals in three dimensions, and dumbbells only ordering in two dimensions. However, it is more difficult to form colloidal crystals with both types of shape anisotropie particles than with spheres. Crystals of …
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Use of Spatially Non-Uniform Electric Fields for Contact-Free Assembly of Three-Dimensional Structures from Colloidal Particles
… to the use of non-uniform electric field driven colloidal assembly are described. The first relates to experimental work using dielectrophoretic and electrohydrodynamic forces (electroosmosis) to shape three-dimensional colloidal structures. Formation and stabilization of close-packed …
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Size-binary Zincblende: A Colloidal Approach to Omnidirectional Photonic Bandgaps
Binary colloidal mixtures have the potential to greatly expand the range of mesoscale structures fabricated by self-assembly, putting them at the frontier of the realization of novel photonic crystals. Currently, it is not understood how the multicomponent basis and particle size ratio of binary …
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Fundamental studies towards the fabrication of electroactive monolithic stationary phases in microfluidic channels
… electrochemical cell into a microfluidic chip, colloidal crystallization in microfluidic channels and PANI growth through a colloidal crystal template. Polyaniline was selected as the electroactive material for the fabrication of the monolithic stationary phase as its use for EMLC had already …
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Nanoparticle Engineering of Colloidal Suspension Behavior
… the phase behavior, structure, and assembly of colloidal microsphere suspensions. Specifically, by selectively tuning the electrostatic interactions between silica microspheres and polystyrene nanoparticles, we study the behavior of four key systems: (i) strongly repulsive, (ii) haloing, (iii) …
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Characterization and fabrication of nanoporous materials by template directed sol-gel methods
… using template assisted sol-gel routes. Both colloidal crystals and surfactant self assemblies were employed as templates.<br/>Initial studies focussed on the fabrication of macroporous titano/alumino and tinsilicate materials by dip infiltrating colloidal crystal templates with sol-gel …
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Attractive electrostatic self-assembly of ordered and disordered heterogeneous colloids
Ionic colloidal crystals are here defined as multicomponent ordered colloidal structures stabilized by attractive electrostatic interactions. These crystals are colloidal analogues to ionic materials including zincblende, rocksalt, cesium chloride, and fluorite. A thermodynamic study revealed that …
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