Cited Article: Thompson, P. A general boundary condition for liquid flow at solid surfaces
Alert Expires: 09 NOV 2010
Number of Citing Articles: 4 new records this week (4 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Poly(N-isopropylacrylamide) grafting on aluminium to actively switch its surface drag in water
Authors:
Hyakutake, T; Navrotskiy, AV; Morita, K; Kato, J; Sakaue, H; Novakov, IA; Nishide, H
Author Full Names:
Hyakutake, Tsuyoshi; Navrotskiy, Alexander V.; Morita, Katsuaki; Kato, Junji; Sakaue, Hirotaka; Novakov, Ivan A.; Nishide, Hiroyuki
Source:
POLYMER INTERNATIONAL 59 (10): 1436-1440 OCT 2010
Language:
English
Document Type:
Article
Author Keywords:
graft polymerization; poly(N-isopropylacrylamide); surface modification; temperature sensitive
KeyWords Plus:
TRANSFER RADICAL POLYMERIZATION; BRUSHES; NANOPARTICLES; HYDROGELS
Abstract:
Active control of flow over object surfaces achieved by means of mechanical and/or electrical methods has recently been studied. However, there has been no report on actively switching the surface drag of an object by chemical modification of the object's surface. Poly(N-isopropylacrylamide) (PNIPA) was grafted onto the surface of an aluminium (Al) substrate via (A) surface-initiated atom transfer radical polymerization and (B) radical polymerization with an azo-group surface initiator. The grafting density was 0.19 and 0.15 chains nm(-2), respectively. The water contact angle of the PNIPA-grafted Al surface reversibly changed between 55 and 82 for (A) and between 42 degrees and 65 degrees for (B) at temperatures of 25 and 40 degrees C, which was ascribed to the temperature-responsive, hydrophilic-hydrophobic switching of the grafted PNIPA surface. The PNIPA grafting was applied on the surface of an ogive-shaped Al model. The normalized dropping speed of the model in water in
creased 1.1 times at 42 degrees C in comparison to that at 22 degrees C. Switching of the surface drag of PNIPA-grafted Al in water was demonstrated on the basis of the hydrophilicity and hydrophobicity of the grafted Al surface, the switching occurring with a change in temperature. (C) 2010 Society of Chemical Industry
Reprint Address:
Nishide, H, Waseda Univ, Dept Appl Chem, Tokyo 1698555, Japan.
Research Institution addresses:
[Hyakutake, Tsuyoshi; Kato, Junji; Nishide, Hiroyuki] Waseda Univ, Dept Appl Chem, Tokyo 1698555, Japan; [Navrotskiy, Alexander V.; Novakov, Ivan A.] Volgograd State Tech Univ, Volgograd 400131, Russia; [Morita, Katsuaki; Sakaue, Hirotaka] Japan Aerosp Explorat Agcy, Chofu, Tokyo 1828522, Japan
E-mail Address:
nishide@waseda.jp
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Cited Reference Count:
28
Times Cited:
0
Publisher:
JOHN WILEY & SONS LTD; THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND
Subject Category:
Polymer Science
ISSN:
0959-8103
DOI:
10.1002/pi.2887
IDS Number:
666GT
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Title:
Critical transport of polymeric electrolytes in wavy-rough microtube
Authors:
Chu, ZKH
Author Full Names:
Chu, Z. Kwang-Hua
Source:
JOURNAL OF APPLIED PHYSICS 108 (7): Art. No. 074906 OCT 1 2010
Language:
English
Document Type:
Article
KeyWords Plus:
VISCOSITY; ION; SURFACES; RATES; FLOW
Abstract:
We obtain the steady velocities and volume flow rates (up to the second order) of polymeric electrolytes along the cross-section of an (approximated) wavy-rough microtube by using the verified Eyring's transition rate model and boundary perturbation method. Our numerical results show that the wavy-roughness could tune the electric-field-driven transport especially for larger forcing due to the larger surface-to-volume ratio and slip-velocity effect. We also found a rather low electrical resistance for certain critical temperature after careful selection of geometric and material parameters. (C) 2010 American Institute of Physics. [doi:10.1063/1.3493156]
Reprint Address:
Chu, ZKH, Inner Mongolia Univ Sci & Technol, Sch Math Phys & Biol Engn, Baotou 014010, Peoples R China.
Research Institution addresses:
Inner Mongolia Univ Sci & Technol, Sch Math Phys & Biol Engn, Baotou 014010, Peoples R China
E-mail Address:
chukh49@gmail.com
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Cited Reference Count:
22
Times Cited:
0
Publisher:
AMER INST PHYSICS; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
Subject Category:
Physics, Applied
ISSN:
0021-8979
DOI:
10.1063/1.3493156
IDS Number:
667UW
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Title:
Nanoscale Poiseuille Flows of Liquid Argon
Authors:
Liu, C; Li, ZG
Author Full Names:
Liu, Chong; Li, Zhigang
Source:
ISCM II AND EPMESC XII, PTS 1 AND 2 1233: 366-371 2010
Language:
English
Document Type:
Proceedings Paper
Author Keywords:
Nanoscale; Poiseuille flow; Liquid argon
KeyWords Plus:
FLUID-SOLID INTERFACE; BOUNDARY-CONDITIONS; MOLECULAR-DYNAMICS; SLIP LENGTH; SHEAR-FLOW; SURFACES
Abstract:
In nanoscale flow systems, the flow motion is affected by many parameters, some of which may play different roles under different conditions. In this work, we investigate the flux of liquid argon in nanoscale Poiseuille flows through molecular dynamics simulations. By illustrating the flux as a function of a dimensionless number, which represents the effective surface effect on the fluid, we show that the fluid motion in nanochannels under small external forces can be categorized into two regimes based on the role of the temperature. For lame external forces, a bimodal behavior in the flux is observed as the fluid-wall interaction is varied. The underlying mechanisms that govern the flow fashions are discussed.
Reprint Address:
Liu, C, Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China.
Research Institution addresses:
[Liu, Chong; Li, Zhigang] Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
E-mail Address:
mezli@ust.hk
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Cited Reference Count:
21
Times Cited:
0
Publisher:
AMER INST PHYSICS; 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
ISSN:
0094-243X
IDS Number:
BRL16
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Title:
EFFECTS OF CHANNEL SCALE ON SLIP LENGTH OF FLOW IN MICRO/NANO-CHANNELS
Authors:
Yang, XF; Zheng, ZQC
Author Full Names:
Yang, Xiaofan; Zheng, Zhongquan C.
Source:
FEDSM2009, VOL 2 : 477-482 2009
Language:
English
Document Type:
Proceedings Paper
KeyWords Plus:
MOLECULAR-DYNAMICS; BOUNDARY-CONDITIONS; SOLID-SURFACES; HYBRID METHOD; FLUID-FLOW; CONTINUUM; SIMULATION; PARTICLE; MODEL
Abstract:
The concept of slip length, related to surface velocity and shear rate, is often used to analyze the slip surface property for flow in micro or nano-channels. In this study, a hybrid scheme that couples Molecular dynamics simulation (used near the solid boundary to include the surface effect) and a continuum solution (to study the fluid mechanics) is validated and used for the study of slip length behavior in the Couette flow problem. By varying the height of the channel across multiple length scales, we investigate the effect of channel scale on surface slip length. In addition, by changing the velocity of the moving-solid wall, the influence of shear rate on the slip length in a certain ranee of the channel height is studied. The results show that within a certain range of the channel heights, the slip length is size-dependant. This upper bound of the channel height can vary with the shear rate.
Reprint Address:
Yang, XF, Kansas State Univ, Manhattan, KS 66506 USA.
Research Institution addresses:
[Yang, Xiaofan; Zheng, Zhongquan C.] Kansas State Univ, Manhattan, KS 66506 USA
E-mail Address:
xiaofan@ksu.edu; zzheng@ksu.edu
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Cited Reference Count:
23
Times Cited:
0
Publisher:
AMER SOC MECHANICAL ENGINEERS; THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
IDS Number:
BRK49
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