Abstract:

Dataset supporting the publication titled, Adsorption of Pluronic block copolymers on silica nanoparticles, published in Coll Surf A 2013, vol 422, pp 155-164. dx.doi.org/10.1016/j.colsurfa.2013.01.010 Polymers on the surface of nanoparticles are of great scientific and technological importance since they dictate many important properties and functions of dispersed systems. We investigate here the organization of a representative poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO–PPO–PEO) block copolymer on silica nanoparticles dispersed in water. Pluronic P105 (EO36PO56EO36) adsorbs on protonated silica and starts forming hydrophobic domains above a certain bulk polymer concentration, called critical surface micelle concentration (csmc), which is lower than the critical micelle concentration (cmc) of Pluronic P105 in plain water. The csmc decreases with increasing particle concentration and decreasing particle size. Below its csmc, the PEO–PPO–PEO block copolymer adsorption on protonated silica nanoparticles is similar to the adsorption of PEO homopolymers. Above the csmc, the block copolymers form micelle-like aggregates on protonated silica nanoparticles, as suggested by the adsorbed layer thickness, adsorbed polymer amount, and presence of hydrophobic domains.

Suggested Citation:

Alexandridis, Paschalis. 2014. Dataset for: Adsorption of Pluronic block copolymers on silica nanoparticles. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7HQ3WWV

Publications:

Sarkar, B., Venugopal, V., Tsianou, M., & Alexandridis, P. (2013). Adsorption of Pluronic block copolymers on silica nanoparticles. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 422, 155–164. doi:10.1016/j.colsurfa.2013.01.010

Purpose:

The aim of this work is to examine how various parameters such as particle surface chemistry, size, concentration, and temperature influence nanoparticle–polymer interactions and control the self-organization and structure of the adsorbed polymer layer. We consider the interactions of the PEO–PPO–PEO block copolymer Pluronic P105 (EO36PO56EO36) with silica nanoparticles (of different size and surface chemistry) dispersed in aqueous solution.

Data Parameters and Units:

Data for Figure 1-- Small Angle X-ray Scattering data that leads to the information in Table 1: Raw SAX 1 wt% deprotonated [10.6nm, 16nm, 26nm], 2 theta (angle), Intensity, Error, q (Angstrom^-1). Data for Figure 2-- Pyrene fluorescence emmision intensity (I1/I3) ratio vs. Pluronic P105 concentration for the presence 0 and 0.1 wt% deprotonated (top, Figure 2) and protonated (bottom, Figure 2): Pyrene Fluorescence spectra for Pluronic P105 in water in the absence of any nanoparticle at pH=3 [0 wt%, 0.005 wt%, 0.01 wt%, 0.05 wt%, 0.08 wt%, 0.1 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 1.0 wt%, 5.0 wt%, 10.0 wt%], wavelength (nm), Intensity. Data for Figure 3-- Pyrene fluorescence emmision intensity (I1/I3) ratio vs. Pluronic P105 concentration in the presence 0, 0.01, 0.02, and 0.1 wt% protonated 10.6 nm SM (top), 16.6 nm HS(middle), and 26.0 nm TM (bottom) silica nanoparticles: Pyrene Fluorescence spectra for Pluronic P105 in water in the absence of any nanoparticle at pH=3, temperature 22 Deg C [0 wt%, 0.005 wt%, 0.01 wt%, 0.05 wt%, 0.08 wt%, 0.1 wt%, 0.3 wt%, 0.5 wt%, 0.8 wt%, 1.0 wt%, 5.0 wt%, 10.0 wt%], wavelength (nm), Intensity. Data for Figure 6-- Relative viscosity vs. particle volume fraction. From the slope of this curve, the adsorbed layer thicknesses were calculated. Kinematic viscosity [SM-30 Nanoparticles, 20.6 nm protonated nanoparticles (SM), 10.6 nm protonated nanoparticles (SM) ], Sample number, 10.6 nm SM NP concentration (wt%), NP (gms), Total (gms), SM solution (gms), SM solution actual (gms), P105 plus water actual (gms),Total actual (gms), NP concentration actual (wt%), Nanoparticle volume fraction, bath temp (degrees Celsius), Temperature Beaker (degrees Celsius), visc Size ID, Viscomet er constant C20, Efflux time-Trial 1 (seconds), Efflux time-Trial 2 (seconds), Average efflux time (seconds), Kinematic Viscosity (cst), Relative viscosity. Data for Table 4-- csmc for different experimental condition in the presence of various types and amounts of silica nanoparticles. Data obtained from Pyrene fluorescence emmision intensity (I1/I3) ratio vs. Pluronic P105 concentration: Pyrene Fluorescence spectra for Pluornic P105 in water in the presence of 0.01 wt% 10.6 nm protonated silica (SM) nanoparticle at pH=3 and 40 degrees Celsius [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%], wavelength (nm), Intensity. Data for Table 6-- adsorbed layer thickness for different experimental conditions in the presence of various types and amounts of polymers. Data obtained from relative viscosity vs. nanoparticle volume fraction measurements: Theoretical and Actual PEG (20k), HCl (g), Water (g),Total (g). Sample number, 10.6 nm SM NP conc (wt%), NP (g), Total (g), SM-30 (g), SM-30 Actual (g), Solvent Mixture (g), Total Actual (g), NP Concentration Actual (wt%), Nanoparticle volume fraction, Bath Temperature (degrees Celsius), Beaker Temperature (degrees Celsius), Viscometer size/ID, Visco Constant, Efflux time-Trial 1 (seconds), Efflux time- Trial 2 (seconds), Average efflux time (seconds), Kinematic Viscosity (cst), Relative Viscosity (cst).

Methods:

Silica nanoparticles of three different sizes, Ludox® SM-30, HS-40, and TM-50 (denoted in the present work as SM, HS, and TM, respectively) dispersed in water at pH ∼ 10 were obtained from Grace Davidson (Columbia, MD) as a gift. These particles are negatively charged (with a zeta potential of −70 mV [32]) and electrostatically stabilized. Small angle X-ray scattering (SAXS) for 1 wt% dispersions of SM, HS, and TM particles in water are measured to be spherical with nominal diameter 10.6, 16.6, and 26.0 nm, and polydispersity of 0.16, 0.15, and 0.15, respectively. The particle shape and sizes that we obtained from SEM images (not shown here) are in agreement with the SAXS data. FTIR spectra of dry SM-type particles confirm the presence of Si single bond O single bond Si, silanol (SiOH), and molecular water.

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