Structure and Rheology of Colloid-in-liquid Crystal Composites with Novel Anisotropic and Hierarchical Microstructures PDF Download
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Author: Heberth A. Diestra Cruz
Publisher:
ISBN:
Category : Anisotropy
Languages : en
Pages : 234
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Book Description
Author: Heberth A. Diestra Cruz
Publisher:
ISBN:
Category : Anisotropy
Languages : en
Pages : 234
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Author: Vincent Labalette
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Colloidal clays are hydrous magnesium phyllosilicates (sometimes aluminum), usually bearing a negative structural charge coming from isomorphic substitution compensated by the presence of cations in the basal spacing or on the surface of the colloid. These nanoparticles have a platelet shape with an aspect ratio going from 20 to 100. When immersed in water, clays hydrate and swell, leading to the release of the cations. The hydroxyl group presents on the edge of the particles are sensitive to the pH (titrable sites) resulting in an amphoteric edge charge. At low pH the rim is positively charged and becomes neutral or negative at pH 11. Therefore, suspensions of colloidal clays have both charge and shape anisotropies. Thanks to these features, clay dispersions exhibit interesting optical properties (ochreous clays), mechanical properties (tile manufacturing, surface coating) and even cleaning properties (grease-removing). Although studied for decades, the behavior of colloidal clays remains controversial. In this manuscript, we propose a coarse-grained model to simulate particles with both structural and charge anisotropy. This model allows studying the behavior of colloidal suspensions at equilibrium and under shear flow. Contrary to the Monte-Carlo method usually employed to model the equilibrium behavior of anisotropic particles, the model presented in this thesis takes into account hydrodynamic interactions, allowing the dynamics of the system to be studied. The particles are coarse-grained as clusters of spheres bound by springs or constrained to a rigid body motion thanks to solid mechanics equations. The dynamics of the particles are computed using the Accelerated Stokesian Dynamics code (ASD), and the electrostatic interactions are computed in a pairwise additive fashion with a Yukawa potential. The implementation of this coarse-grained model in the ASD method allows studying the microstructure of anisotropic particles presenting similar features than Laponite, a 2:1 synthetic smectite clay widely studied experimentally and numerically in the literature. Several studies are presented here while varying the volume fraction and the range of electrostatic interactions. The dynamics of formation of the observed structures (Wigner glass, gel, overlapping coin, etc.) and their structural evolution behavior are then discussed. Finally, the rheological response of the different structures to a start-up shear has been studied, highlighting the importance of the ratio between the electrostatic and the hydrodynamic forces. For initially percolated systems, it has been shown that the stress response on the applied strain depends on the initial microstructure at short times, and exhibits shear-thinning and final viscous response independent of the initial structure.
Author: Daniel Morphew
Publisher:
ISBN:
Category : Colloids
Languages : en
Pages : 0
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Book Description
Colloidal self-assembly promises to be an elegant and efficient route to the bottom-up fabrication of 3-dimensional structures. Programming hierarchical schemes for colloid self-assembly has the potential to widen structural diversity and mimic biological complexity. However, it remains a grand challenge to bridge hierarchies of multiple length- and time-scales associated with the structure and dynamics along complex self-assembly pathways. This thesis employs a variety of computational techniques to address this challenge in silico, programming colloidal self-assembly for structural hierarchy in close connection with contemporary experimental research. In a series of studies, the self-assembly of designer charge-stabilised colloidal magnetic particles into a number of supracolloidal polyhedra for size-selected clusters is demonstrated. The design space supports self-assembled polyhedra of very different morphologies, namely tubular and hollow spheroidal structures, for which the dominant pathways for self-assembly are elucidated, revealing two distinct mechanisms. Here, it is found that for a staged assembly pathway the structure, which derives the strongest energetic stability from the first stage and the weakest from the second stage, is most kinetically accessible. Stemming from these findings, a generic design principle exploiting a hierarchy of interaction strengths is introduced. This design principle is subsequently employed to demonstrate the hierarchical self-assembly of triblock patchy colloidal particles into a variety of colloidal crystals. Furthermore, this design framework exhibits a novel bottom-up route to the fabrication of cubic diamond colloidal crystals, which until recently, have remained elusive.
Author: Eugene Michael Terentjev
Publisher: Oxford University Press, USA
ISBN: 0199667926
Category : Science
Languages : en
Pages : 605
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Book Description
This handbook will provide the reader with a profound introduction to the key subjects comprising the relatively new topic of Soft Condensed Matter. It will provide students and researchers with an authoritative overview of the field, identify key principles at play, and the most prominent ways of further development.
Author: Mark Warner
Publisher: Oxford University Press
ISBN: 9780199214860
Category : Mathematics
Languages : en
Pages : 423
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Book Description
This text is a primer for liquid crystals, polymers, rubber and elasticity. It is directed at physicists, chemists, material scientists, engineers and applied mathematicians at the graduate student level and beyond.
Author: Dimitrios A. Lamprou
Publisher: MDPI
ISBN: 3039364235
Category : Medical
Languages : en
Pages : 436
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Book Description
The 3D printing (3DP) process was patented in 1986; however, only in the last decade has it begun to be used for medical applications, as well as in the fields of prosthetics, bio-fabrication, and pharmaceutical printing. 3DP or additive manufacturing (AM) is a family of technologies that implement layer-by-layer processes in order to fabricate physical models based on a computer aided design (CAD) model. 3D printing permits the fabrication of high degrees of complexity with great reproducibility in a fast and cost-effective fashion. 3DP technology offers a new paradigm for the direct manufacture of individual dosage forms and has the potential to allow for variations in size and geometry as well as control dose and release behavior. Furthermore, the low cost and ease of use of 3DP systems means that the possibility of manufacturing medicines and medical devices at the point of dispensing or at the point of use could become a reality. 3DP thus offers the perfect innovative manufacturing route to address the critical capability gap that hinders the widespread exploitation of personalized medicines for molecules that are currently not easy to deliver. This Special Issue will address new developments in the area of 3D printing and bioprinting for drug delivery applications, covering the recent advantages and future directions of additive manufacturing for pharmaceutical products.
Author: Rodney Priestley
Publisher: Royal Society of Chemistry
ISBN: 1788014170
Category : Science
Languages : en
Pages : 442
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Book Description
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.
Author: Ingo Dierking
Publisher: MDPI
ISBN: 3038971154
Category : Science
Languages : en
Pages : 161
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Book Description
This book is a printed edition of the Special Issue "Nanomaterials in Liquid Crystals" that was published in Nanomaterials
Author: Jan Mewis
Publisher: Cambridge University Press
ISBN: 0521515998
Category : Science
Languages : en
Pages : 417
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Book Description
Presented in an accessible and introductory manner, this is the first book devoted to the comprehensive study of colloidal suspensions.
