Abstract:

The dataset includes fluorescence intensity-vs-wavelength data and cloud point and precipitation observations for aqueous dispersions of silica nanoparticles in the presence of surfactants and salt. These data support the publication: Bodratti, A. M.; Wu, J.; Jahan, R.; Sarkar, B.; Tsianou, M.; Alexandridis, P. “Mono- and Divalent Salts as Modifiers of PEO-PPO-PEO Block Copolymer Interactions with Silica Nanoparticles in Aqueous Dispersions” J. Dispersion Sci. Tech. 2015, 36 (12), 1806-1815. DOI: 10.1080/01932691.2015.1011273

Suggested Citation:

A. M. Bodratti, M. Tsianou, P Alexandridis. 2017. Dataset for: Mono- and Divalent Salts as Modifiers of PEO-PPO-PEO Block Copolymer Interactions with Silica Nanoparticles in Aqueous Dispersions. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7765CQH

Publications:

Bodratti, A. M., Wu, J., Jahan, R., Sarkar, B., Tsianou, M., & Alexandridis, P. (2015). Mono- and Di-valent Salts as Modifiers of PEO-PPO-PEO Block Copolymer Interactions with Silica Nanoparticles in Aqueous Dispersions. Journal of Dispersion Science and Technology, 36(12), 1806–1815. doi:10.1080/01932691.2015.1011273

Purpose:

Investigate the effect of salinity on the adsorption of polymeric surfactants on silica particles.

Data Parameters and Units:

Pyrene fluorescence intensity (unitless), wavelength (nm), Pluronic P105 (EO37PO56EO37) concentration (0 wt%, 0.001 wt%, 0.005 wt%, 0.01 wt%, 0.02 wt%, 0.05 wt %, 0.08 wt%, 0.1 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 1.0 wt%, 3.0 wt%, 5.0 wt%, 10.0 wt%), pronated silica nanoparticle concentration (SM NP) (0 wt%, 0.01%, 0.1 wt%), salt concentration (no salt added, 0.001 M, 0.01 M, 0.03 M, 0.05 M, 0.08 M, 0.1 M, 0.3 M, 0.5 M), salt (CaCl2, MgCl2, NaCl), Cloud point (onset of turbidity determined visually) (clear, turbid), precipitation growth (no growth, percip)

Methods:

Ludox (Registered trademark) SM-30 silica nanoparticles with an average diameter of 10.6 nm and a polydispersity of 0.16 were received in water at pH ~ 10 and negatively charged (zeta potential -70mV). The poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer Pluronic P105 (EO37PO56EO37) with a nominal weight of 6500 Da was used as the model dispersant. Sodium chloride, calcium chloride dihydrate and magnesium chloride hexahydrate were used as salts. Solutions were prepared using MilliQ-treated deionized water (18 m Ohm) to a pH of ~ 3. Salt-nanoparticle dispersions were prepared to salt concentrations from 0.001 to 0.5 M and nanoparticle concentrations of 0.01 and 0.10 wt%. Salt-particle solutions were used to create solutions with Pluronic P105 with concentrations from 0.001 to 5 wt% Pluronic P105. Cloud point as a function of Pluronic P105 concentration was determined by visual observation of the onset of turbidity and precipitation on the walls of glass was documented. Fluorescence spectroscopy using pyrene was used to determine the micropolarity of solutions using a Hitachi 2500 fluorescence spectrophotometer in the 340-460 nm wavelength range at 22 degrees Celsius. The pyrene fluorescence intensity was analyzed to probe the local environment on the surface of silica particles. The optical appearance was analyzed to probe the colloidal stability of silica particles with adsorbed polymeric surfactant.

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