Title

Characterization of silica nanoparticles formed in a complex coacervate environment by polyelectrolyte molecular weight

Document Type

Poster

Campus where you would like to present

Ellensburg

Event Website

https://digitalcommons.cwu.edu/source

Start Date

18-5-2020

Abstract

When introduced into an aqueous solution of potassium bromide within a well-defined concentration range, poly(diallyl ammonium chloride) (PDADMAC) and poly(sodium-4-styrene sulfonate) (PSS) polyelectrolytes can form a biphasic state known as a complex coacervate. The coacervate divides into low polyelectrolyte concentration (lean) and high polyelectrolyte concentration (dense) phases. While many researchers have proposed these complex coacervates can provide unique environments for chemical reactions the number of practical examples is limited. The research presented here employs a novel use of the Stöber synthesis to create silica nanoparticles within the complex coacervate environment. Multiple reaction mixtures were composed from silane reagents and/or amino-terminated amino silane reagents. These reactions were controlled by the molecular weight of the PSS, using 70,000 Dalton and 1,000,000 Dalton mean molecular weights. The presence of these nanoparticles was confirmed with infrared spectroscopy and their size and morphology was determined with scanning electron microscopy. From this data, differences in silica nanoparticle product by polyelectrolyte molecular weight for several reagent compositions is discussed.

Faculty Mentor(s)

Dion Rivera

Department/Program

Chemistry

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May 18th, 12:00 PM

Characterization of silica nanoparticles formed in a complex coacervate environment by polyelectrolyte molecular weight

Ellensburg

When introduced into an aqueous solution of potassium bromide within a well-defined concentration range, poly(diallyl ammonium chloride) (PDADMAC) and poly(sodium-4-styrene sulfonate) (PSS) polyelectrolytes can form a biphasic state known as a complex coacervate. The coacervate divides into low polyelectrolyte concentration (lean) and high polyelectrolyte concentration (dense) phases. While many researchers have proposed these complex coacervates can provide unique environments for chemical reactions the number of practical examples is limited. The research presented here employs a novel use of the Stöber synthesis to create silica nanoparticles within the complex coacervate environment. Multiple reaction mixtures were composed from silane reagents and/or amino-terminated amino silane reagents. These reactions were controlled by the molecular weight of the PSS, using 70,000 Dalton and 1,000,000 Dalton mean molecular weights. The presence of these nanoparticles was confirmed with infrared spectroscopy and their size and morphology was determined with scanning electron microscopy. From this data, differences in silica nanoparticle product by polyelectrolyte molecular weight for several reagent compositions is discussed.

https://digitalcommons.cwu.edu/source/2020/COTS/37