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.
Recommended Citation
MacFarland, Rory and Rimpler, Matthew, "Characterization of silica nanoparticles formed in a complex coacervate environment by polyelectrolyte molecular weight" (2020). Symposium Of University Research and Creative Expression (SOURCE). 37.
https://digitalcommons.cwu.edu/source/2020/COTS/37
Department/Program
Chemistry
Additional Mentoring Department
https://cwu.studentopportunitycenter.com/2020/04/characterization-of-silica-nanoparticles-formed-in-a-complex-coacervate-environment-by-polyelectrolyte-molecular-weight/
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
Faculty Mentor(s)
Dion Rivera