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1 e-Polymers 2009, no. 123 http://www.e-polymers.org ISSN 1618-7229 Thixotropy of aqueous solution of fluorocarbon-modified poly(acrylic acid) Hongqi Hu,1 2* Lin Li,1 Mingcai Chen3 1*Key Laboratory of Rubber-plastics (Qingdao University of Science and Technology), Ministry of Education, Qingdao 266042, China; fax: 0086-0532-84022725; e--mail: huhq@qust.edu.cn 2Key Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences. 3Guangzhou Institute of Chemistry, Chinese

Mater. J. 101 (2004) 168 - 176. [5] Assaad JJ, Khayat KH: Effect of viscosity-enhancing admixtures on formwork pressure and thixotropy of selfconsolidating concrete, ACI Mater. J. 103 (2006) 280 - 287. [6] Roussel N, Cussigh F: Distinct-layer casting of SCC: The mechanical consequences of thixotropy, Cem. Con. Res. 38 (2008) 624 - 632. [7] Billberg P: Form pressure generated by self-compacting concrete - Influence of thixotropy and structural behaviour at rest, Ph.D. thesis, The Royal Institute of Technology, Stockholm (2006). [8] Roussel N: Rheology of fresh concrete

Abstract

Sewage sludge presents a dual rheological behaviour with an abrupt change between the two regimes. Using a new technique of reconstruction of the velocity profile, the behaviour can be modelled by a unique equation including liquid and solid components but also a structural parameter. It is also rigorously demonstrated that the only one rheological behaviour in steady state in the liquid regime is a truncated power-law which can be defined only for a shear rate and a shear stress higher than a critical value, γ̇c and τc. Moreover, the critical shear rate and shear stress increase with the solid content and depend on the fractal dimension of flocs which implies that thixotropic effects are all the more important as the sludge is thick and fresh.

The Significance of Disturbance and Thixotropy in Mobility Problems LOUIS J. GOODMAN* ABSTRACT The details of an investigation to evaluate the effects of disturbance on stress-strain relationships of cohesive soils in the problem areas of plate sinkage and shear strength are described in this paper. The problem presented is twofold: 1. The investigation of the effects of complete disturbance or remolding to clay soils and subsequent thixotropic regain characteristics as measured by empirical soil stress-strain parameters. 2. The establishment of a

V, Schofield AB, Weitz DA: Glass-like kinetic arrest at the colloidal gelation transition. Phys. Rev. Lett. 86 (2001) 6042-6045. [11] Abou B, Bonn Dm Meunier J: Non linear rheology of Laponite suspensions under an external drive. J. Rheol. 47 (2003) 979-988. [12] Derec C, Adjari A, Lequeux F: Rheology and aging: A simple approach. Eur. Phys. J. E 4 (2001) 355-361. [13] Mewis J: Thixotropy - A general review. J. Non-Newt. Fluid Mech. 6 (1979) 1-20. [14] Barnes HA: Thixotropy - A review. J. Non-Newtonian Fluid Mech. 70 (1997) 1-33. [15] de Kruif CG, van Iersel EMF

8eit;e-l{f� Pa;�;e-� Georg Reinhard, Anett Moll, Ursula Rammelt, Dresden, Germany I . . I ! I . I . ,/C 1 24 Th ixotropie bei der Pigmentierung von wasserverdiinn baren Polymerd ispersionen Thixotropy at the Pigmentation of Waterth innable Polymer Dispersions Fiir die Suspension anorganischer Feststoffparti­ kel in wasserverdiinnbaren Polymerdispersionen liegen giinstige Bedingungen vor, wenn die Pig­ ment- und Polymerteilchen im pH-Bereich der Dispersion Oberflachenladungen gleichen Vor­ zeichens tragen. Es wurden daher 1;-Potential

: AADE National Technical Conference and Exhibition, New Orleans, Louisiana„ American Association of Drilling Engineers, 2009, pp. 1-8, AADE 2009-NTCE-12-02. 8 [8] Maxey, J., Thixotropy and Yield Stress Behavior in Drilling Fluids, in: AADE National Technical Conference and Exhibition, Houston, Texas, April 10-12, 2007, American Association of Drilling Engineers, 2007, pp. 1-10, AADE-07-NTCE-37. [9] Schulz A., Strauß H., Reich M., Modern rheological analysis of drilling fluids, in: Proceedings of the ASME 2013 32nd Inter- national Conference on Ocean, Offshore and

cementitious materials modified with nanoclays, Const. Build. Mater. 36 (2012) 749 - 757. [6] Kaci A, Chaouche M, Andréani PA: Influence of bentonite clay on the rheological behaviour of fresh mortars, Cem. Concr. Res. 41 (2011) 373 - 379. [7] Kaci A, Bouras R, Chaouche M, Ani PA, Brossas H: Adhesive and rheological properties of mortar joints, Appl. Rheol. 19 (2009) 51970. [8] Barnes HA: Thixotropy - A review, J. Non-Newtonian Fluid Mech. 70 (1997) 1 - 33. [9] Mewis J, Wagner NJ: Thixotropy, Adv. Colloid Interface Sci. 147-148 (2009) 214 - 227. [10] Mřller PCF, Mewis J

properties of pineapple jam. Hahn model described adequately the rheological characteristics of pineapple jam. KEYWORDS: pineapple, jam, rheology, thixotropy Author Notes: Correspondence: U.S. Shivhare, Department of Chemical Engineering & Technology, Punjab University, Chandigarh-160014, Tel: 91-172-2534906, Fax: 91-172-2779173, E-mail: usshiv@yahoo.com 1. Introduction Jam is prepared by boiling the fruit pulp with sugar to a reasonably thick consistency, firm enough to hold the tissues in position. It should not contain less than 68.5% total soluble solids (TSS

Abstract

The determination of flow curves and the apparent viscosity curves at 28°C of creams containing human leukocyte alpha interferon as active principle is presented in this paper. These creams are used for the treatment of papiloma virus and herpes simplex. It is demonstrated that their behaviour corresponds to a thixotropic fluid. The Herschel-Bulkley model parameters are presented and discussed as an indicator of the grade of thixotropy. Apparent viscosity plotted as a function of shear rate and storage time allows defining the time period in which the samples recover their initial structure. Additionally it was concluded that for determining the quality of the product, the acceptance limit of the viscosity should be specified for a given shear rate.