Effect of membrane bending stiffness on the axisymmetric deformation of capsules in uniaxial extensional flow

2001 ◽  
Vol 13 (5) ◽  
pp. 1234-1242 ◽  
Author(s):  
Sehoon Kwak ◽  
C. Pozrikidis
Keyword(s):  
Extensional Flow ◽  
Axisymmetric Deformation ◽  
Bending Stiffness ◽  
Membrane Bending ◽  
Uniaxial Extensional Flow

EFFECT OF MEMBRANE BENDING STIFFNESS ON THE DEFORMATION OF ELASTIC CAPSULES IN EXTENSIONAL FLOW: A LATTICE BOLTZMANN STUDY

2007 ◽  
Vol 18 (08) ◽  
pp. 1277-1291 ◽  
Author(s):  
Y. SUI ◽  
Y. T. CHEW ◽  
P. ROY ◽  
H. T. LOW
Keyword(s):  
Lattice Boltzmann ◽  
Present Model ◽  
Extensional Flow ◽  
Bending Stiffness ◽  
Immersed Boundary ◽  
Two Dimensional ◽  
Bending Rigidity ◽  
Elastic Membranes ◽  
Membrane Bending ◽  
Boltzmann Method

The transient deformation of liquid capsules enclosed by elastic membranes in two-dimensional extensional flow is studied numerically, using an improved immersed boundary-lattice Boltzmann method. The purpose of the present study is to investigate the effect of interfacial bending stiffness on the deformation of such capsules, under the subcritical elasticity capillary number conditions. The present model can simulate flow-induced deformation of capsules with arbitrary resting shapes (concerning the in-plane tension) and bending-free configurations. The deformation of capsules with initially circular, elliptical, and biconcave resting shapes was investigated in the present study; the capsules' bending-free configurations were considered as either circular shapes or their initially resting shapes. The results show that for capsules with bending-free configuration as circles, membrane bending rigidity has significant rounding effect on the steady deformed profiles. For elliptical and biconcave capsules with resting shapes as the bending-free configurations, it is found that with the bending stiffness increasing, the capsules' steady shapes are more akin to their initial shapes.

Bilayer Membrane Bending Stiffness by Tether Formation From Mixed PC-PS Lipid Vesicles

1990 ◽  
Vol 112 (3) ◽  
pp. 235-240 ◽  
Author(s):  
J. Song ◽  
R. E. Waugh
Keyword(s):  
Present Report ◽  
Membrane Surface ◽  
Lipid Vesicles ◽  
Phosphatidyl Serine ◽  
Bilayer Membrane ◽  
Bending Stiffness ◽  
New Approach ◽  
Lipid Mixtures ◽  
Membrane Bending ◽  
Membrane Surface Charge

Recently, a new approach to measure the bending stiffness (curvature elastic modulus) of lipid bilayer membrane was developed (Biophys. J., Vol. 55; pp. 509–517, 1989). The method involves the formation of cylindrical membrane strands (tethers) from bilayer vesicles. The bending stiffness (B) can be calculated from measurements of the tether radius (Rt) as a function of the axial force (f) on the tether: B =f·Rt/2π. In the present report, we apply this method to determine the bending stiffness of bilayer membranes composed of mixtures of SOPC (1-stearoyl-2-oleoyl phosphatidyl choline) and POPS (1-palmitoyl-2-oleoyl phosphatidyl serine). Three different mixtures were tested: pure SOPC, SOPC plus 2 percent (mol/mol) POPS, and SOPC plus 16 percent POPS. The bending stiffness determined for these three different lipid mixtures were not significantly different (1.6–1.8×10-12 ergs). Because POPS carries a net negative charge, these results indicate that changes in the density of the membrane surface charge have no effect on the intrinsic rigidity of the membrane. The values we obtain are consistent with published values for the bending stiffness of other membranes determined by different methods. Measurements of the aspiration pressure, the tether radius and the tether force were used to verify a theoretical relationship among these quantities at equilibrium. The ratio of the theoretical force to the measured force was 1.12 ± 0.17.

scholarly journals Rheological behavior of human blood in uniaxial extensional flow

2018 ◽  
Vol 62 (2) ◽  
pp. 447-456 ◽  
Author(s):  
P. C. Sousa ◽  
R. Vaz ◽  
A. Cerejo ◽  
M. S. N. Oliveira ◽  
M. A. Alves ◽  
...  
Keyword(s):  
Human Blood ◽  
Rheological Behavior ◽  
Extensional Flow ◽  
Uniaxial Extensional Flow

Dilute Polyacrylamide Solutions under Uniaxial Extensional Flow

Langmuir ◽  
2003 ◽  
Vol 19 (3) ◽  
pp. 559-565 ◽  
Author(s):  
Eric Pelletier ◽  
Christer Viebke ◽  
John Meadows ◽  
Peter A. Williams
Keyword(s):  
Extensional Flow ◽  
Uniaxial Extensional Flow

Structural response of an ordered block copolymer melt to uniaxial extensional flow

Soft Matter ◽  
2014 ◽  
Vol 10 (33) ◽  
pp. 6198-6207 ◽  
Author(s):  
Ruinan Mao ◽  
Erica M. McCready ◽  
Wesley R. Burghardt
Keyword(s):  
Block Copolymer ◽  
Extensional Flow ◽  
Structural Response ◽  
Two Dimensional ◽  
Hexagonally Ordered ◽  
Uniaxial Extensional Flow

Two-dimensional SAXS patterns reveal deformation and re-orientation of microdomains in a hexagonally ordered block copolymer melt subjected to uniaxial extensional flow.

Resistance to uniaxial extensional flow of fibre suspensions

2004 ◽  
Vol 43 (3) ◽  
pp. 223-231 ◽  
Author(s):  
Yong Wee Ooi ◽  
Tamarapu Sridhar
Keyword(s):  
Extensional Flow ◽  
Fibre Suspensions ◽  
Uniaxial Extensional Flow
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