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Browsing by Author "Neal, Christopher A P"

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    Supporting data for Tuning the thermodynamic, optical, and rheological properties of thermoresponsive polymer solutions via silica nanoparticle shape and concentration
    (2022-12-08) Neal, Christopher A P; Leon, Valeria; Quan, Michelle C; Chibambo, Nondumiso O; Calabrese, Michelle A; c-neal@umn.edu; Neal, Christopher A P; University of Minnesota, Twin Cities Calabrese Research Lab
    In this work, differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), turbidimetry, and oscillatory rheology were utilized to examine interactions between NPs, PNIPAM, and water and to track changes in phase separation and mechanical properties due to NP concentration and shape. Data presented in this set include raw data files for aforementioned techniques as well as SEM micrographs of silica nanoparticles and thermo-gravimetric analysis (TGA) data for nanoparticle characterization. Through the analysis in the supported manuscript, we found that NP addition reduces phase separation enthalpy (from DSC data) due to PNIPAM-NP hydrogen bonding interactions, the degree to which depends on polymer content. While NP addition minorly impacts thermodynamic (from DSC data) and optical (from turbidimetry data) properties, rheological transitions and associated rheological properties (both from rheology data) are dramatically altered with increasing temperature, and depend on NP quantity, shape, and polymer molecular weight. Thus NP content and shape can be used to finely tune transition temperatures and mechanical properties for applications in stimuli-responsive materials.