Convective Assembly of Non-spherical Colloids
Convective Assembly of Non-spherical Colloids

Author: Ian Dean Hosein

Publisher:

Published: 2009

Total Pages: 0

ISBN-13:

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Fabricating colloidal based materials from non-spherical particles shows the potential to produce materials having a broader diversity of particle packing arrangements and crystal lattice symmetries than possible for spherical bases. These new materials show enhanced structure-property relations, specifically, in terms of photonic bandgap properties. In order to access these enchance properties, a viable method to assemble non-spherical based ordered structures is required. This dissertation describes the application of the convective self-assembly technique to fabricated regular two- and three-dimensional structures from disc, hemispherical cap, spherocylinder and dumbbell shaped colloids. Aqueous particle suspensions with controlled volume fraction permitted the assembly of large scale crystalline monolayers on substrates vertically immersed in the suspension, as the solvent was evaporated. Systematically tuning the particle volume fraction induced different particle packing arrangements in the monolayer. The monolayer structures were then correlated to the crystallization rate and suspension concentration, the two key convective assembly parameters, establishing process control of film structure in the monolayer regime. Adjusting the parameters for slower film deposition, higher suspension concentrations were used to extend the convective assembly technique three-dimensional structures from spherocylinder and dumbbell shaped particles. Additionally, the photonic band structures of crystals with face-centered cubic (FCC) and base-centered monoclinic lattices and dumbbell shape bases were calculated. The band structures revealed that a range of particle shapes produced complete photonic bandgaps.

Final Report Self-Assembly of Non-Spherical Colloids
Final Report Self-Assembly of Non-Spherical Colloids

Author:

Publisher:

Published: 2016

Total Pages: 7

ISBN-13:

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The frontier for light-matter interactions in materials organized at the mesoscale holds promise to realize exciting applications in solid state lighting, solar energy conversion, thermal photovoltaics and subwavelength imaging, to name a few. Colloidal self-assembly provides a low cost, large area approach to the fabrication of templates for structuring functional materials chemistries through atomic layer deposition, chemical vapor deposition and physical vapor deposition. However, the commonly available spherical building blocks lead to high symmetry periodic dielectric materials with weak light control that have limited impact in photonics. Increasing focus on atypical colloidal structures is uncovering novel partial order mesophases (i.e., degenerate crystals, plastic crystals), quasicrystals, Archemedean tilings and superlattices with dramatic effects on dispersion relations. More generally, the desire for complex function from simple building blocks has ignited experimental efforts using supramolecular chemistry (i.e., specific interactions and directional bonding analogs) to diversify structure. Our work focuses on the colloidal analog to the rich phase space mapped by molecular solids. Through experiments and complementary modelling we advance synthesis and processing science to control phase behavior and dynamics through particle architecture, quiescent confinement and shear flows.

Colloidal Particles at Liquid Interfaces
Colloidal Particles at Liquid Interfaces

Author: Bernard P. Binks

Publisher: Cambridge University Press

Published: 2006-08-17

Total Pages: 500

ISBN-13: 1139458183

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The understanding of how small solid particles operate at liquid interfaces is minimal. This book brings together the topics actively being investigated, with contributions from experts in the field. It will be of interest to researchers in chemistry, physics, chemical engineering, pharmacy, food science and materials science.

Colloidal Crystals of Spheres and Cubes in Real and Reciprocal Space
Colloidal Crystals of Spheres and Cubes in Real and Reciprocal Space

Author: Janne-Mieke Meijer

Publisher: Springer

Published: 2015-06-11

Total Pages: 164

ISBN-13: 3319148095

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This thesis presents an in-depth study on the effect of colloidal particle shape and formation mechanism on self-organization and the final crystal symmetries that can be achieved. It demonstrates how state-of-the-art X-ray diffraction techniques can be used to produce detailed characterizations of colloidal crystal structures prepared using different self-assembly techniques, and how smart systems can be used to investigate defect formation and diffusion in-situ. One of the most remarkable phenomena exhibited by concentrated suspensions of colloidal particles is the spontaneous self-organization into structures with long-range spatial and/or orientational orders. The study also reveals the subtle structural variations that arise by changing the particle shape from spherical to that of a rounded cube. In particular, the roundness of the cube corners, when combined with the self-organization pathway, convective assembly or sedimentation, was shown to influence the final crystal symmetries.

Synthesis And Applications Of Optically Active Nanomaterials
Synthesis And Applications Of Optically Active Nanomaterials

Author: Hongyou Fan

Publisher: World Scientific

Published: 2017-06-28

Total Pages: 125

ISBN-13: 9813223006

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In this book, the synthesis and applications of recent nanomaterials are discussed and reviewed in detail. The scope of the book covers from nanocrystals and their self-assembly, synthesis and applications of optically active porphyrin particles, and synthesis and applications of carbon nanodots. Depending on the categories of the materials, detailed driving forces to self-assembly of the cluster or arrays are discussed. Finally, major applications of each category nanomaterial are discussed.Nanomaterials discussed in this book are important building blocks for nanoelectronic and nanophotonic device fabrications. Methods to synthesize and functionalize them are crucial to enable their applications in these areas. This book provides readers with detailed description and discussions on synthesis and functionalization of recent optically active nanomaterials. This book is an important tool for researchers in the nanomaterial field. It will be also a great reference for college students to master overall knowledge in the field.

Advanced Materials
Advanced Materials

Author: Theodorus van de Ven

Publisher: Walter de Gruyter GmbH & Co KG

Published: 2020-01-20

Total Pages: 405

ISBN-13: 3110537737

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Advanced Materials gives an unique insight into the specialized materials that are required to run our modern society. Provided within are the fundamental theories and applications of advanced materials for metals, glasses, polymers, composites, and nanomaterials. This book is ideal for scientists and engineers of materials science, chemistry, physics, and engineering, and students of these disciplines.

Nanotechnology for Lithium-Ion Batteries
Nanotechnology for Lithium-Ion Batteries

Author: Yaser Abu-Lebdeh

Publisher: Springer Science & Business Media

Published: 2012-10-17

Total Pages: 288

ISBN-13: 1461446058

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This book combines two areas of intense interest: nanotechnology, and energy conversion and storage devices. In particular, Li-ion batteries have enjoyed conspicuous success in many consumer electronic devices and their projected use in vehicles that will revolutionize the way we travel in the near future. For many applications, Li-ion batteries are the battery of choice. This book consolidates the scattered developments in all areas of research related to nanotechnology and lithium ion batteries.

Polymer Colloids
Polymer Colloids

Author: Rodney Priestley

Publisher: Royal Society of Chemistry

Published: 2019-12-02

Total Pages: 442

ISBN-13: 1788014170

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Academic and industrial research around polymer-based colloids is huge, driven both by the development of mature technologies, e.g. latexes for coatings, as well as the advancement of new materials and applications, such as building blocks for 2D/3D structures and medicine. Edited by two world-renowned leaders in polymer science and engineering, this is a fundamental text for the field. Based on a specialised course by the editors, this book provides the reader with an invaluable single source of reference. The first section describes formation, explaining basic properties of emulsions and dispersion polymerization, microfluidic approaches to produce polymer-based colloids and formation via directed self-assembly. The next section details characterisation methodologies from microscopy and small angle scattering, to surface science and simulations. The final chapters close with applications, including Pickering emulsions and molecular engineering for materials development. A comprehensive guide to polymer colloids, with contributions by leaders in their respective areas, this book is a must-have for researchers and practitioners working across polymers, soft matter and chemical and molecular engineering.