A rheological study of concentrated aqueous nanotube dispersions

被引:150
作者
Kinloch, IA [1 ]
Roberts, SA [1 ]
Windle, AH [1 ]
机构
[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
基金
英国工程与自然科学研究理事会;
关键词
nanotubes; rheology; processing;
D O I
10.1016/S0032-3861(02)00664-X
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The rheological behaviour of aqueously dispersed oxidised nanotubes has been studied at concentrations at which the nanotubes interacted with each other. The dispersed nanotubes represented a high aspect ratio system with a ratio of similar to80. Dynamic and steady shear tests were applied to the dispersions using a cone and plate rheometer. The system was found to behave as a reversibly flocculated dispersion. The structure of the dispersions was highly strain-sensitive with the linear viscoelastic region (LVR) extending to strains of 1%. The moduli within the LVR were independent of frequency and scaled with concentration by a power law. Under steady shear the dispersions rapidly shear thinned up to a Peclet number of similar to1 to 10. At higher Peclet numbers the shear thinning behaviour followed the Ostwald-de Waele power law. The dispersions were thixotropic and recovered their structure, and hence viscosity, upon standing. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:7483 / 7491
页数:9
相关论文
共 27 条
[1]   Continuous production of aligned carbon nanotubes: a step closer to commercial realization [J].
Andrews, R ;
Jacques, D ;
Rao, AM ;
Derbyshire, F ;
Qian, D ;
Fan, X ;
Dickey, EC ;
Chen, J .
CHEMICAL PHYSICS LETTERS, 1999, 303 (5-6) :467-474
[2]   Thixotropy - A review [J].
Barnes, HA .
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS, 1997, 70 (1-2) :1-33
[3]   THE YIELD STRESS MYTH [J].
BARNES, HA ;
WALTERS, K .
RHEOLOGICA ACTA, 1985, 24 (04) :323-326
[4]   Orientational order in concentrated dispersions of plate-like kaolinite particles under shear [J].
Brown, ABD ;
Clarke, SM ;
Convert, P ;
Rennie, AR .
JOURNAL OF RHEOLOGY, 2000, 44 (02) :221-233
[5]   CORRELATION OF DYNAMIC AND STEADY FLOW VISCOSITIES [J].
COX, WP ;
MERZ, EH .
JOURNAL OF POLYMER SCIENCE, 1958, 28 (118) :619-622
[6]   Chemical treatment of carbon nanotubes [J].
Esumi, K ;
Ishigami, M ;
Nakajima, A ;
Sawada, K ;
Honda, H .
CARBON, 1996, 34 (02) :279-281
[7]  
Harris P.J.F., 1999, Carbon Nanotubes and Related Structures, DOI DOI 10.1017/CBO9780511605819
[8]   Electrochemical capacitance of a nanoporous composite of carbon nanotubes and polypyrrole [J].
Hughes, M ;
Chen, GZ ;
Shaffer, MSP ;
Fray, DJ ;
Windle, AH .
CHEMISTRY OF MATERIALS, 2002, 14 (04) :1610-1613
[9]   Fibers from polypropylene/nano carbon fiber composites [J].
Kumar, S ;
Doshi, H ;
Srinivasarao, M ;
Park, JO ;
Schiraldi, DA .
POLYMER, 2002, 43 (05) :1701-1703
[10]  
Lapasin R., 1995, RHEOLOGY IND POLYSAC, DOI DOI 10.1007/978-1-4615-2185-3