'Biodrop' Evaporation and Ring-Stain Deposits: The Significance of DNA Length
| Autor: | Martin E.R. Shanahan, Alexandros Askounis, Khellil Sefiane, Yasuyuki Takata, Vasileios Koutsos |
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| Rok vydání: | 2016 |
| Předmět: |
Triple line
Silicon Surface Properties Analytical chemistry Coffee ring effect Evaporation chemistry.chemical_element 02 engineering and technology FILMS 010402 general chemistry 01 natural sciences chemistry.chemical_compound POLY(ETHYLENE OXIDE) DROPLETS Electrochemistry Perpendicular COFFEE-RING General Materials Science DRYING DROPLETS CONTACT LINE DEPOSITS Spectroscopy Drop (liquid) Contact line Water DNA Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences SESSILE DROPS Kinetics Crystallography MOLECULAR-WEIGHT PILLAR FORMATION chemistry POLYMER-SOLUTION Volatilization 0210 nano-technology PATTERN-FORMATION |
| Zdroj: | Askounis, A, Takata, Y, Sefiane, K, Koutsos, V & Shanahan, M E R 2016, ' "Biodrop" Evaporation and Ring-Stain Deposits : The Significance of DNA Length ', Langmuir, vol. 32, no. 17, pp. 4361-4369 . https://doi.org/10.1021/acs.langmuir.6b00038 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.6b00038 |
| Popis: | Small sessile drops of water containing either long or short strands of DNA ("biodrops") were deposited on silicon substrates and allowed to evaporate. Initially, the triple line (TL) of both types of droplet remained pinned but later receded. The TL recession mode continued at constant speed until almost the end of drop lifetime for the biodrops with Short DNA strands, whereas those containing long DNA strands entered a regime of significantly lower TL recession. We propose a tentative explanation of our observations based on free energy barriers to unpinning and increases in the viscosity of the base liquid due to the presence of DNA molecules. In addition, the structure of DNA deposits after evaporation was investigated by AFM. DNA self-assembly in a series of perpendicular and parallel orientations was observed near the contact line for the long-strand DNA, while, with the short-stranded DNA, smoother ring-stains with some nanostructuring but no striations were evident. At the interior of the deposits, dendritic and faceted crystals were formed from short and long strands, respectively, due to diffusion and nucleation limited processes, respectively. We suggest that the above results related to the biodrop drying and nanostructuring are indicative of the importance of DNA length, i.e., longer DNA chains consisting of linearly bonded shorter, rod-like DNA strands. |
| Databáze: | OpenAIRE |
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