Scattering insights into shear-induced scission of rod-like micelles

Huang, Guan-Rong; Murphy, Ryan P.; Porcar, Lionel; Tung, Chi-Huan; Do, Changwoo; Chen, Wei-Ren

doi:10.1016/j.jcis.2025.02.039

Scattering insights into shear-induced scission of rod-like micelles

Journal Article · Fri Feb 07 00:00:00 EST 2025 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1016/j.jcis.2025.02.039· OSTI ID:2538235

Huang, Guan-Rong ^[1]; Murphy, Ryan P. ^[2]; Porcar, Lionel ^[3]; ^[4]; ^[4]; ^[4]

National Tsing Hua Univ., Hsinchu (Taiwan); National Center for Theoretical Sciences, Taipei (Taiwan)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Inst. Laue-Langevin (ILL), Grenoble (France)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Understanding the scission of rod-like micelles under mechanical forces is crucial for optimizing their stability and behavior in industrial applications. This study investigates how micelle length, flexibility, and external forces interact, offering insights into the design of micellar systems in processes influenced by mechanical stress. Although significant, direct experimental observations of flow-induced micellar scission using scattering techniques remain scarce. Small angle neutron scattering (SANS) is used to explore the shear response of aqueous cetyltrimethylammonium bromide (CTAB) solutions with sodium nitrate. Rheological tests show shear thinning with no shear banding, ensuring a uniform flow field for reliable interpretation of scattering data. As shear rate increases, the scattering spectra show angular distortion, which is analyzed using spherical harmonic decomposition to characterize flow-induced scission and micelle orientation under shear. Two analysis steps are used: a model-independent spectral eigendecomposition reveals a decrease in micellar length, while regression analysis quantifies the evolution of the length distribution and mean length with shear rate. Additionally, micelle alignment increases with shear, quantified by the orientational distribution function. In conclusion, these findings provide experimental evidence for flow-induced alignment and scission, offering a new framework for understanding shear-induced phenomena in micellar systems.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); National Science and Technology Council in Taiwan; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2538235

Journal Information:: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Vol. 686; ISSN 0021-9797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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