Gelation of rod particle suspension in Newtonian fluid

Hyejin Han; Chongyoup Kim

Korea-Australia Rheology Journal, Vol.27, No.2, 125-135, May, 2015

DOI10.1007/s13367-015-0013-0 Export Citation

Gelation of rod particle suspension in Newtonian fluid

Hyejin Han, and Chongyoup Kim^†

Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea

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The gelation of FeOOH rod particles in a glycerin-water mixture under shear flows is investigated using rheological measurements. The average length and the average diameter of the rod particles are 1 μm and 120 nm, respectively. The van der Waals energy is much larger than the Brownian and electrostatic contributions. To examine the effect of shear history on gelation, two different kinds of experimental procedures are used: A strong, but short preshear followed by a creep test and a preshear for a long time followed by a creep test. The rod particle suspension becomes a gel during the creep test showing the plateau in G' and yield stress. The gelation time during the creep test is dependent on preshear time while it is not affected by the preshear stress for a short time before the creep test. Both the plateau in G' and the yield stress are larger when the preshear time is longer. The gelation appears to occur by two steps of the formation of flocs by the aggregation of individual particles and then the formation of the sample spanning network by the aggregation of the flocs. Gel strength appears to be dependent on floc size which is determined by the imposed shear stress in the present case of shear induced gelation.

Keywords:floc;particulate gel;preshear;creep;shear induced coagulation;gel strength

[References]

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Brenner H, Int. J. Multiph. Flow, 1, 195 (1974)
Burleson DJ, Penn RL, Langmuir, 22(1), 402 (2006)
Chambon F, Winter HH, Polym. Bull., 13, 499 (1985)
Coussot P, J. Non-Newton. Fluid Mech., 211, 41 (2014)
Coussot P, Nguyen QD, Huynh HT, Bonn D, J. Rheol., 46(3), 573 (2002)
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Edwards SF, Doi M, 1986, The Theory of Polymer Dynamics, Oxford Press, Clarendon. (1986)
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Giesekus H, Rheol. Acta, 2, 50 (1962)
Hinch EJ, Leal LG, J. Fluid Mech., 52, 683 (1972)
Hyun K, Wilhelm M, Klein CO, Cho KS, Nam JG, Ahn KH, Lee SJ, Ewoldt RH, McKinley GH, Prog. Polym. Sci, 36, 1697 (2011)
Israelachvili JN, 2011, Intermolecular and Surface Forces, 3rd ed., Academic Press, Amsterdam. (2011)
Jeffery GB, Proc. R. Soc. A, 102, 161 (1922)
Kim JM, Eberle APR, Gurnon AK, Porcar L, Wagner NJ, J. Rheol., 58(5), 1301 (2014)
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Singh V, Koch DL, Stroock AD, Langmuir, 27(19), 11813 (2011)
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Wierenga A, Philipse AP, Lekkerkerker HNW, Boger DV, Langmuir, 14(1), 55 (1998)
Wierenga AM, Philipse AP, Colloids Surf. A: Physicochem. Eng. Asp., 137, 355 (1998)
Wilkins GMH, Spicer PT, Solomon MJ, Langmuir, 25(16), 8951 (2009)
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[3] Booth F, Discuss. Faraday Soc., 18, 104 (1954)

[4] Brenner H, Int. J. Multiph. Flow, 1, 195 (1974)

[5] Burleson DJ, Penn RL, Langmuir, 22(1), 402 (2006)

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[9] De la Torre JG, Bloomfield VA, Q. Rev. Biophys., 14, 81 (1981)

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[11] Doi M, Edwards SF, J. Chem. Soc.-Faraday Trans., 74, 1802 (1978)

[12] Edwards SF, Doi M, 1986, The Theory of Polymer Dynamics, Oxford Press, Clarendon. (1986)

[13] Edwards SF, Evans KE, J. Chem. Soc.-Faraday Trans., 78, 113 (1982)

[14] Giesekus H, Rheol. Acta, 2, 50 (1962)

[15] Hinch EJ, Leal LG, J. Fluid Mech., 52, 683 (1972)

[16] Hyun K, Wilhelm M, Klein CO, Cho KS, Nam JG, Ahn KH, Lee SJ, Ewoldt RH, McKinley GH, Prog. Polym. Sci, 36, 1697 (2011)

[17] Israelachvili JN, 2011, Intermolecular and Surface Forces, 3rd ed., Academic Press, Amsterdam. (2011)

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