Abstract:
Dataset supporting the publication, Nanoparticle surface modification by amphiphilic polymers in aqueous media, that appears in Journal of Colloid and Interface Science 2013, vol 397, pp 1-8. http://dx.doi.org/10.1016/j.jcis.2013.01.034 We investigate the role of three polar organic solvents (dimethyl formamide (DMF), dimethyl sulfoxide (DMSO), and glycerol) on the interfacial behavior of Pluronic P105 poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO–PPO–PEO) block copolymers on protonated silica nanoparticles in an aqueous dispersion. The polymer adsorption and self-assembly have been assessed from critical surface micelle concentration (csmc, measured by pyrene fluorescence spectroscopy) and adsorbed layer thickness (measured by capillary viscometry) data. Above its csmc, PEO–PPO–PEO block copolymers form hydrophobic domains on the nanoparticle surface. Below a critical concentration in water (known as critical displacer concentration, cdc), organic solvents act as displacers (molecules that can displace adsorbed polymer from a solid surface). The critical displacer concentration is obtained from the csmc and the polymer adsorbed layer thickness data. The cdc is found to be dependent on both the amount of nanoparticles present in the system as well as the nature of the displacer. Below the cdc, the csmc increases and the adsorbed polymer layer thickness decreases with increasing organic solvent concentration. Interfacial free energy calculations suggest that DMF, DMSO, and glycerol can adsorb onto the silica particles by displacing adsorbed PEO. These calculations are consistent with the experimental results in that, as a displacer, glycerol is the most effective and DMF is the least effective. Above the cdc, the influence of glycerol or DMSO on csmc is opposite to that of DMF which is attributed to the cosolvent effect.
Suggested Citation:
Alexandridis, Paschalis. 2014. Dataset for: Nanoparticle surface modification by amphiphilic polymers in aqueous media. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7CZ354G
Data Parameters and Units:
Data for Figure 2-- Pyrene fluorescence emmision intensity (I1/I3) ratio vs. Pluronic P105 concentration in the presence of 0 (left column) and 0.1 wt% (right column) protonated silical nanoparticles and varying amount of organic solvents: DMF (top); DMSO (middle); Glycerol (bottom): Pyrene Fluorescence spectra for Pluronic P105 in water in the absence of any nanoparticle and DMF/DMSO/Glycerol 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 4-- Relative viscosity vs. particle volume fraction. From the slope of this curve the adsorbed layer thicknesses were calculated. Kinematic viscosity for the aqueous dispersion of 10.6 nm silica nanoparticle (SM) in the presence of [0 wt% DMF, 2 wt% DMF, 5 wt% DMF, 10 wt% DMF, 2 wt% DMSO, 5 wt% DMSO, 10 wt% DMSO, 1 wt% Glycerol, 2 wt% Glycerol, 5 wt% Glycerol, 10 wt% Glycerol] and 2.0% Pluronic P105 at 20 deg C: 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. Nanoparticle Microscopy-- Scanning electron microscopy (SEM) images of silica nanoparticles: 10. 6 nm SM type (top); 16.6 nm HS type (middle); 26.0 nm TM type bottom row. Images were captured using a Hitachi SU-70 scanning electron microscope fitted with a tranmission electron detector. 30.0 kV acceleration voltage was applied.
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