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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Papagiannopoulos, Aristeidis
National Hellenic Research Foundation
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2024Advances in Small Angle Neutron Scattering on Polysaccharide Materialscitations
- 2021Effects of Polymer Block Length Asymmetry and Temperature on the Nanoscale Morphology of Thermoresponsive Double Hydrophilic Block Copolymers in Aqueous Solutionscitations
- 2020Combining particle tracking microrheology and viscometry for the study of <scp>DNA</scp> aqueous solutionscitations
- 2012Merging high doxorubicin loading with pronounced magnetic response and bio-repellent properties in hybrid drug nanocarrierscitations
- 2008Optical coherence tomography picorheology of biopolymer solutionscitations
Places of action
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article
Combining particle tracking microrheology and viscometry for the study of <scp>DNA</scp> aqueous solutions
Abstract
<jats:title>Abstract</jats:title><jats:p>We use video particle tracking microrheology (VPTMR) in order to investigate the viscoelasticity of salmon DNA and correlate it to its steady‐flow shear‐thinning viscosity. Aqueous solutions of DNA are tested in a wide concentration range from the dilute to the semidilute unentangled concentration regime. The observed mean squared displacement shows power‐law scaling with lag‐time which is equivalent to power‐law behavior of the complex modulus as a function of frequency that is, <jats:styled-content>|<jats:italic>G</jats:italic><jats:sup>*</jats:sup>(<jats:italic>ω</jats:italic>)| = <jats:italic>S</jats:italic> ∙ <jats:italic>ω</jats:italic><jats:sup> <jats:italic>α</jats:italic></jats:sup></jats:styled-content>. The relaxation exponent <jats:styled-content> <jats:italic>α</jats:italic></jats:styled-content> changes abruptly with concentration in the semidilute regime from about 1 to about 0.5 which is the exponent predicted by the Rouse model. The quasi‐property <jats:styled-content> <jats:italic>S</jats:italic></jats:styled-content> follows the scaling of viscosity for uncharged polymers near <jats:italic>θ</jats:italic>‐conditions in the semidilute regime that is, <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/bip23353-math-0001.png" xlink:title="urn:x-wiley:00063525:media:bip23353:bip23353-math-0001" /> with <jats:styled-content> <jats:italic>ν</jats:italic><jats:sub>eff</jats:sub> = 0.50 − 0.51</jats:styled-content>. The shear‐thinning exponent observed by viscometry increases gradually towards the value of 0.5 which has been predicted for Rouse chains under flow. Our findings are in agreement with recent studies of DNA solutions where DNA is treated as a model polymer and addresses the low‐molar mass regime of DNA viscoelasticity. This work demonstrates that the combination of passive particle tracking with viscometry can provide a complete picture on the viscoelasticity of DNA‐based biopolymer materials.</jats:p>