자료유형  

 학위논문

Control Number  

0016934308

International Standard Book Number  

9798380388733

Dewey Decimal Classification Number  

660

Main Entry-Personal Name  

Rosenfeld, Joseph Azriel.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of Pennsylvania., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(140 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-03, Section: B.

General Note  

Advisor: Lee, Daeyeon.

Dissertation Note  

Thesis (Ph.D.)--University of Pennsylvania, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약A colloid most generally and most simply is a dispersion of one phase of physical matter within a second continuous phase, with the characteristic length scale of the dispersed phase ranging from a few nanometers to tens of micrometers, with the dispersed phase being generally referred to as colloidal particles. Colloidal particles tend to aggregate as their surface contact with the continuous phases produces an interfacial tension that is minimized upon coalescence or agglomeration of the particles. Numerous methods are employed to prevent aggregation ranging from steric short-range repulsion strategies to long-range electrostatic repulsion. Interfacial stabilizers have also been utilized to imbue colloids with added functionality creating novel composite materials. In this thesis, novel interfacial stabilizers are explored for colloidal stabilization and composite fabrication. Emulsions are stabilized by ion-pairing of polyelectrolytes of high naturality with oppositely charged surfactants enabling control over emulsion morphology and phase inversion. The onset of phase inversion is hypothesized to coincide with surfactant micellization based on oil-water partition coefficient measurements. Nanoemulsions are fabricated using a precipitation approach and their growing interfaces are stabilized by co-precipitating a polymer followed by interfacial crosslinking, creating a nanocapsule. Deeper understanding of nanocapsule size control is achieved via computational fluid dynamics in conjunction with ternary phase diagrams, the conclusion being that the degree of polymer supersaturation drives the final nanocapsule size. Addition of nanoparticles to the precipitation mixture enables arrangement of the nanoparticles within the nanocapsule according to the nanoparticle wetting properties, thereby creating a nanocomposite with a range of potential desirable bulk or interfacial properties. Finally, the thermal properties of a colloidal suspension are investigated using infrared thermometry of a microfluidic platform, potentially displaying unique interfacial behavior. This work thus aims to expand the palette of colloidal stabilizers and potential colloidal morphologies possible while providing fundamental insights into the phenomena that enable these techniques.

Subject Added Entry-Topical Term  

Chemical engineering.

Subject Added Entry-Topical Term  

Polymer chemistry.

Subject Added Entry-Topical Term  

Nanotechnology.

Index Term-Uncontrolled  

Nanoemulsions

Index Term-Uncontrolled  

Colloids

Index Term-Uncontrolled  

Interfacial tension

Index Term-Uncontrolled  

Nanoparticles

Added Entry-Corporate Name  

University of Pennsylvania Chemical and Biomolecular Engineering

Host Item Entry  

Dissertations Abstracts International. 85-03B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:641682