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Hypothesis: The structural details, viscosity trends and dynamic phenomena int-butanol/water solutions are closely related on the molecular scales acrossthe entire composition range. Utilizing the experimental small- and wide-anglex-ray scattering (SWAXS) method, molecular dynamics (MD) simulations and thecomplemented-system approach method developed in our group it is possible tocomprehensively describe the structure-viscosity-dynamics relationship in suchstructurally versatile hydrogen-bonded molecular liquids, as well as insimilar, self-assembling systems with pronounced molecular and supramolecularstructures at the intra-, inter-, and supra-molecular scales.  Experiments: The SWAXS and x-ray diffraction experiments and MD simulationswere performed for aqueous t-butanol solutions at 25 {\deg}C. Literatureviscosity and self-diffusion data were also used.  Findings: The interpretive power of the proposed scheme was demonstrated bythe extensive and diverse results obtained for aqueous t-butanol solutionsacross the whole concentration range. Four composition ranges withqualitatively different structures and viscosity trends were revealed. Theexperimental and calculated zero-shear viscosities and molecular self-diffusioncoefficients were successfully related to the corresponding structural details.The hydrogen bonds, that were, along with hydrophobic effects, recognized asthe most important driving force for the formation of t-butanol aggregates,show intriguing lifetime trends and thermodynamic properties of theirformation.

Structural, Rheological and Dynamic Aspects of Hydrogen-Bonding Molecular Liquids: Aqueous Solutions of Hydrotropic tert-Butyl Alcohol