Browsing by Author "Calabrese, Michelle A"

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    Capillary thinning analysis
    (2022-01-03) Lauser, Kathleen T; Calabrese, Michelle A; mcalab@umn.edu; Calabrese, Michelle A; University of Minnesota Calabrese Research lab
    This collection of scripts is a package for analyzing extensional rheology data of liquid bridges. While this was created with Dripping-onto-Substrate datasets, this data analysis package may be useful for other liquid bridge thinning applications such as CaBER. Any pre-processing of images, such as binarizing, converting to png or cropping, can be completed with ImageJ.
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    Supporting Data for Self-Assembly of Unusually Stable Thermotropic Network Phases by Cellobiose-Based Guerbet Glycolipids
    (2024-04-08) Das, Soumi; Zheng, Caini; Calabrese, Michelle A; Reineke, Theresa M; Siepmann, Ilja J; Mahanthappa, Mahesh K; Lodge, Timothy P; treineke@umn.edu; Reineke, Theresa M; University of Minnesota
    These files contain data along with associated output from instrumentation supporting all results reported in the referenced paper. Bicontinuous thermotropic liquid crystal (LC) materials, such as double gyroid (DG) phases, are highly promising for various applications due to their intricate 3D network structures. However, the lack of robust molecular design rules for shape-filling amphiphiles hinders their utility. To address this, we synthesized cellobiose-based glycolipids with Guerbet-type branched alkyl tails and examined their thermotropic LC self-assembly. Through techniques including differential scanning calorimetry (DSC), polarized optical microscopy (POM), and small-angle X-ray scattering (SAXS), we found that Guerbet cellobiosides have a strong propensity to form DG morphology across broad thermotropic phase ranges. The stability of these assemblies depends on the alkyl tail structure and anomeric configuration of the glycolipid in a previously unrecognized manner. Molecular simulations provide further insights, revealing molecular motifs crucial for network phase self-assembly, paving the way for future designs and applications of network LC materials.
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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.