957 lines
81 KiB
Text
957 lines
81 KiB
Text
<!DOCTYPE html>
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<h1 class="nist-page__title">Probing Accelerated Salt-Induced Relaxation Dynamics of Laponite Suspensions Using X-Ray Photon Correlation Spectroscopy Measurements and Molecular Dynamics Simulations</h1>
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<div class="nist-field__item"><time datetime="2022-12-22T12:00:00Z">December 22, 2022</time>
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<div class="nist-field__item">Sohaib Mohammed, Meishen Liu, Qingteng Zhang, Suresh Narayanan, <span class="nist-author">Fan Zhang</span>, Greeshma Gadikota</div>
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<h3>Abstract</h3>
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Linking the physics of the relaxation behavior of visco-elastic fluids as they form arrested gel states to the underlying nano-scale structure and energetic interactions is essential for developing predictive controls. In this study, laponite suspensions at concentrations of 3 wt%, are studied as model systems to probe the influence of salt-induced relaxation behavior arising from the assembly of laponite discs. X-Ray Photon Correlation Spectroscopy (XPCS) measurements show that laponite suspensions prepared in the presence of 5 mM concentrations of CaCl2, MgCl2 and CsCl salts accelerate the formation of arrested gel states, with CaCl2 having a significant impact followed by CsCl and MgCl2 salts. The competing effects of ion size and charge on the relaxation behavior are noted. For example, the relaxation times of laponite suspensions in the presence of Mg2+ ions are slower compared to Cs+ ions despite the higher charge, suggesting that cation size dominates in this scenario. Faster relaxation behavior of laponite suspensions in the presence of Ca2+ ions compared to Cs+ ions shows that higher charge dominates the size of the ion. The trends in the relaxation behavior are consistent with the cluster formation behavior of laponite suspensions and the electrostatic interactions predicted from MD simulations. Charge balance is achieved by the intercalation of the cations at the negatively charged surfaces of laponite suspensions. These studies show that the arrested, gel-state of laponite suspensions is accelerated in the presence of salts, with ion sizes and charges having a competing effect on the relaxation behavior.
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<h3 class="nist-field__label">Keywords</h3>
|
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<div class="nist-field__item">Laponite, CaCl2, MgCl2, CsCl, XPCS, MD, self-assembly, gel formation</div>
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Mohammed, S.
|
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, Liu, M.
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, Zhang, Q.
|
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, Narayanan, S.
|
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, Zhang, F.
|
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and Gadikota, G.
|
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(2022),
|
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Probing Accelerated Salt-Induced Relaxation Dynamics of Laponite Suspensions Using X-Ray Photon Correlation Spectroscopy Measurements and Molecular Dynamics Simulations, Materials, [online], https://doi.org/10.3390/ma16010101
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Created December 22, 2022, Updated January 6, 2023
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