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Dynamic interactions between nematic point defects in the spinning extrusion duct of spiders
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10.1063/1.2186640
/content/aip/journal/jcp/124/14/10.1063/1.2186640
http://aip.metastore.ingenta.com/content/aip/journal/jcp/124/14/10.1063/1.2186640
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the director fields corresponding to the ERPD (a) and ER (b) structures. In (a), the left and right point defects, respectively, correspond to the hyperbolic and radial hedgehogs. Note that the director is undefined in the core of each point defect.

Image of FIG. 2.
FIG. 2.

Evolution of the orientation and alignment fields during the precollision [(a) and (b)], collision [(c) and (d)], and postcollision [(e) and (f)] regimes of two nematic point defects along the axis of cylindrical capillary. Frames (a), (b), (c), (d), (e), and (f) correspond, respectively, to the dimensionless time , 40 585, 40 599, 40 613, and 40 914. The small segments represent the directors and thus the local preferred orientation of the rodlike molecules. The grayscale corresponds to . The white regions are ordered while the black ones, around defects, are disordered. , .

Image of FIG. 3.
FIG. 3.

Evolution of the scalar order parameter profile, along the axis, during the precollision [(a) and (b)], collision [(c) and (d)], and postcollision [(e) and (f)] regimes. The dimensionless sampling times [(a)–(f)] are , 40 585, 40 599, 40 620, and 40 920. , .

Image of FIG. 4.
FIG. 4.

Reduced position of the point defects along the axis as a function of the reduced time during the annihilation process. (a) , ; (b) , .

Image of FIG. 5.
FIG. 5.

Reduced speed of the point defects as a function of their separating distance during the annihilation process expressed in semilog and linear scales. The speed of the point defects in the precollision and early collision regimes follows an exponential law. The trends for the (a) and (b) cases can be fitted with and , respectively. (a) , ; (b) , .

Image of FIG. 6.
FIG. 6.

Evolution of reduced total free energy (a) and corresponding reduced interaction force (b) as a function of the reduced interdefect distance for , . The circles and squares denote, respectively, the linear and exponential fits.

Image of FIG. 7.
FIG. 7.

Evolution of reduced total free energy (a) and corresponding reduced interaction force (b) as a function of the reduced interdefect distance for , . The circles and squares denote, respectively, the linear and exponential fits.

Image of FIG. 8.
FIG. 8.

Time frame of the reduced total free energy during which the nematic system undergoes its structural transition from the ERPD to the ER configuration through the annihilation of two point defects of opposite topological charges. , . In zone (a), the system presents two defects with distinct cores; in zone (b), the two defects have collapsed into a single defect which gradually disappears; in zone (c) the system is in defect-free ER configuration.

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/content/aip/journal/jcp/124/14/10.1063/1.2186640
2006-04-11
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamic interactions between nematic point defects in the spinning extrusion duct of spiders
http://aip.metastore.ingenta.com/content/aip/journal/jcp/124/14/10.1063/1.2186640
10.1063/1.2186640
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