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Structure and clustering of colloidal dimers on a surface
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Qiao, Qi. Structure and clustering of colloidal dimers on a surface. Retrieved from https://doi.org/doi:10.7282/T3WS8WD8

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TitleStructure and clustering of colloidal dimers on a surface
NameQiao, Qi (author); Chiew, Yee (chair); Rutgers University; Graduate School - New Brunswick
Date Created2016
Other Date2016-05 (degree)
SubjectChemical and Biochemical Engineering, Nanoparticles, Colloidal crystals
Extent1 online resource (v, 34 p. : ill.)
DescriptionThe study of two-dimensional (2D) structures formed by nanoparticles and colloidal particles has attracted a great deal of attention due to the rich and diverse structural patterns found in these systems. The self-assembly of particles into periodic phases is of relevance to technological applications in photonics, biomaterials, catalytic supports, and advanced materials. Very recently growing attention has been paid to the investigation of the self-organization of colloidal dumbbells, that is, dimers composed of two connected spherical particles. Because of the technical capability to synthesize dimeric nanoparticles of different sizes, aspect ratios, and asymmetric functionalizations, recent studies have demonstrated that these anisotropic particles exhibit diverse periodic structures and can be used as building blocks for the fabrication of new materials. We report an extensive study of the structure and clustering properties of colloidal dimers that interact through excluded-volume interactions combined with short-range attraction and long-range electrostatic repulsion. Such inter-particle interacting potential can generate particle aggregates through short-range attraction and cluster stabilization due to long-range repulsion. We carried out a systematic molecular dynamics simulations to study the behavior of colloidal dimers that interact through this potential on a two dimensional planar surface. Using mathematic analysis of the radial distribution functions, cluster size distributions, and thermodynamic properties of the colloidal system, we have identified different distinct structural states: disordered fluids, finite-size aggregates, one-dimensional clusters, and percolating gel phase. At very low temperatures, the system may exist as a low-density ordered phase. We also examine the structure of the clusters, and the dynamics of the aggregation process. Our study enables us to map a phase diagram for the colloidal dimer system on the temperature-density plane. The information obtained in this study provides fundamental scientific insight and shed lights on the behavior of non-spherical colloidal dimers adsorbed on a planar surface.
NoteM.S.
NoteIncludes bibliographical references
Noteby Qi Qiao
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T3WS8WD8
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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