{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T22:15:54Z","timestamp":1781561754398,"version":"3.54.5"},"reference-count":38,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2025,9,10]],"date-time":"2025-09-10T00:00:00Z","timestamp":1757462400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"CONAHCYT","award":["1031265"],"award-info":[{"award-number":["1031265"]}]},{"name":"University of Rennes","award":["1031265"],"award-info":[{"award-number":["1031265"]}]},{"name":"AIS","award":["1031265"],"award-info":[{"award-number":["1031265"]}]},{"name":"CNRS","award":["1031265"],"award-info":[{"award-number":["1031265"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Recent studies on semi-dilute Calf-Thymus DNA (CT-DNA) solutions have revealed the presence of birefringence and small-scale textures influenced by shear and ionic strength. In this study, we investigate these phenomena on the same solutions to elucidate the underlying shear-induced supramolecular organization and relaxation dynamics using rheo-birefringence, rheology, and rheo-SAXS (small-angle X-ray scattering). Static SAXS confirmed concentration-dependent inter-chain correlations in the 15\u201325 nm range, while rheology revealed a slipping yield-stress behavior. Oscillatory strain sweep and steady state rheo-birefringence experiments correlated the appearance of textures with the onset of flow and a stress plateau observed over a shear rate range from approximately 1 to 1000 s\u22121. Transient rheo-birefringence and rheo-SAXS revealed two distinct relaxation mechanisms on well-separated time scales: a fast process lasting a few seconds, inversely proportional to the shear rate, consistent with the orientational relaxation of DNA segments on a ~20 nm scale; and a slower relaxation over tens of seconds, independent of the shear rate, associated with the disappearance of textures, and attributed to a diffusive process. These findings provide significant insights into the mechanisms governing DNA organization and dynamics in semi-dilute solutions under flow and highlight the need for temporally resolved start-up rheo-SAXS and rheo-birefringence measurements, as well as theoretical models describing these processes across various spatial and temporal scales.<\/jats:p>","DOI":"10.3390\/polym17182452","type":"journal-article","created":{"date-parts":[[2025,9,10]],"date-time":"2025-09-10T14:14:55Z","timestamp":1757513695000},"page":"2452","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Relaxation of Shear-Induced Orientation and Textures in Semi-Dilute DNA Solutions"],"prefix":"10.3390","volume":"17","author":[{"given":"Scarlett Elizabeth","family":"L\u00f3pez-Alvarez","sequence":"first","affiliation":[{"name":"Doctorado en Ciencia de Materiales, Divisi\u00f3n de Ingenier\u00edas, CUCEI, Blvd. M. Garc\u00eda Barrag\u00e1n #1451, Universidad de Guadalajara, Guadalajara 44430, Jalisco, Mexico"},{"name":"Institut des Sciences Chimiques de Rennes, Equipe CORINT, CNRS, UMR 6226, Campus de Beaulieu, Bat 10A, Universit\u00e9 de Rennes, 35042 Rennes, France"},{"name":"Institut de Physique de Rennes (IPR), CNRS, UMR 6251, 35000 Rennes, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fran\u00e7ois","family":"Caton","sequence":"additional","affiliation":[{"name":"Laboratoire Rh\u00e9ologie et Proc\u00e9d\u00e9s, UMR CNRS 5520, Universit\u00e9 Grenoble Alpes, Grenoble INP, 38000 Grenoble, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6734-2633","authenticated-orcid":false,"given":"Denis C. D.","family":"Roux","sequence":"additional","affiliation":[{"name":"Laboratoire Rh\u00e9ologie et Proc\u00e9d\u00e9s, UMR CNRS 5520, Universit\u00e9 Grenoble Alpes, Grenoble INP, 38000 Grenoble, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F\u00e9lix Armando","family":"Soltero Mart\u00ednez","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica, Universidad de Guadalajara, Blvd. M. Garc\u00eda Barrag\u00e1n #1451, Guadalajara 44430, Jalisco, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Florian","family":"Scholkopf","sequence":"additional","affiliation":[{"name":"Institut de Physique de Rennes (IPR), CNRS, UMR 6251, 35000 Rennes, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0628-8765","authenticated-orcid":false,"given":"Fr\u00e9d\u00e9ric","family":"Nallet","sequence":"additional","affiliation":[{"name":"Centre de Recherche Paul Pascal, UMR5031-Universit\u00e9 de Bordeaux, 33600 Pessac, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8154-8590","authenticated-orcid":false,"given":"Guillermo","family":"Toriz","sequence":"additional","affiliation":[{"name":"Departamento de Madera, Celulosa y Papel, Universidad de Guadalajara, Km. 15.5 Carretera Guadalajara-Nogales, Zapopan 45110, Jalisco, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7096-1814","authenticated-orcid":false,"given":"Arnaud","family":"Saint-Jalmes","sequence":"additional","affiliation":[{"name":"Institut de Physique de Rennes (IPR), CNRS, UMR 6251, 35000 Rennes, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marguerite","family":"Rinaudo","sequence":"additional","affiliation":[{"name":"Biomaterials Applications, 6 Rue Lesdigui\u00e8res, 38000 Grenoble, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8121-6887","authenticated-orcid":false,"given":"Lourdes M\u00f3nica","family":"Bravo-Anaya","sequence":"additional","affiliation":[{"name":"Institut des Sciences Chimiques de Rennes, Equipe CORINT, CNRS, UMR 6226, Campus de Beaulieu, Bat 10A, Universit\u00e9 de Rennes, 35042 Rennes, France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Wang, F., Li, P., Chu, H.C., and Lo, P.K. 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