Browsing by Author "Hossain, Mohammad Tanvir"

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    Dynamics of Colloids at Liquid-liquid Interface: Insights from Mesoscale and Microscale Simulations
    (2022-05-09) Hossain, Mohammad Tanvir; Natale, Giovanniantonio; Gates, Ian Donald; Benneke, Anne Maria; Hejazi, Hossein
    The dynamics of a colloidal particle at a liquid-liquid interface play an important role in several processessuch as microrheology, Pickering emulsion, encapsulation, biofilm formation. Their behaviour at the interfaceis completely different from the bulk. Moreover, due to complexity of hydrodynamics and the effectof contact lines make this study more challenging. In addition to that Janus type colloids which have multiplesurface characteristics and shapes introduce another degree of complexity. For example, amphiphilicJanus nanoparticles exhibit higher interfacial activity and adsorb more strongly to fluid interfaces than homogeneousnanoparticles of similar sizes. Both shape and chemical anisotropy on the same particle, Janusparticles offer rich self-assembly possibilities for nanotechnology. Despite their strong interest, the interfacialbehaviour of colloid nanoparticles is not fully exposed.In this thesis, a detailed analysis of dynamics for homogeneous and Janus particle varying their size andlocation at the interface has been provided. To perform that two different approaches have been considerednamed Langevin dynamics(LD) and Dissipative Particle Dynamic (DPD). In LD where the surface force andcontact line fluctuation are considered through an analytical solution where DPD is solved only based onthe interaction between particles.Finally, by using dissipative particle dynamics simulation, the translational diffusion of Janus nanorods atthe interface between two immiscible fluids is investigated. The particle aspect ratio affects both particle’stranslational thermal motion and the average orientation of the particle with respect to the interface atequilibrium. This behaviour is also linked to the interfacial tension of the system.Findings from this research will provide fundamental insights into the dynamics and self-assembly of isotropicand anisotropic Brownian particles at interfaces.