AI Article Synopsis
- Colloidal suspensions of anisotropic particles, like hollow silica rods, are common in industry and their particle shape, particularly lower aspect ratios (1-10), affects their behavior in terms of equilibrium phases and transitions.* -
- The study introduces a system of octadecyl-coated silica rods in tetradecane, demonstrating thermoreversible gelation without interference from gravitational settling, using methods such as rheology and dynamic light scattering.* -
- Analysis through small angle neutron scattering reveals a correlation with simulation predictions, confirming a universal state diagram that helps understand how aspect ratio influences gelation in these suspensions.*
Article Abstract
Colloidal suspensions of anisotropic particles are ubiquitous in particle-based industries. Consequently, there is a need to quantify the effects of particle shape on equilibrium phases and kinetic state transitions, particularly at lower aspect ratios (L/D ≈ 1-10). We present a new, colloidal system comprised of hollow, octadecyl-coated silica rods with 40 nm diameter with controlled aspect ratio and thermoreversible short-range attractions. Rheology and dynamic light scattering measurements on suspensions of these hollow adhesive hard rods with nominal aspect ratio ≈3 suspended in tetradecane exhibit thermoreversible gelation without complicating effects of gravitational settling. Small angle neutron scattering measurements of the microstructure are analyzed to determine the effective strength of attraction in the form of Baxter sticky parameter. Quantitative agreement is found with simulation predictions of the thermoreversible gel transition as a function of volume fraction, further validating a universal state diagram and providing guidance for the effects of aspect ratio on gelation.
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| http://dx.doi.org/10.1016/j.jcis.2024.01.148 | DOI Listing |
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