Capillary breakup extensional rheometry (CaBER) on semi-dilute and concentrated polyethyleneoxide (PEO) solutions

Arnolds, Oliver; Buggisch, Hans; Sachsenheimer, Dirk; Willenbacher, Norbert

doi:10.1007/s00397-010-0500-7

Cited by 100 publications

(128 citation statements)

References 30 publications

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“…The elongational relaxation time k e was about a factor of three lower than the longest relaxation time k s calculated from SAOS measurements. This is different from CaBER results for Boger fluids, where k e % k s was found ] but similar to concentrated polymer solutions [Oliveira et al (2006); Arnolds et al (2010);Clasen (2010); Sachsenheimer et al (submitted)]. Later CaBER measurements for a series of CTAB/NaSal solutions showed that the ratio of the extensional relaxation time and the shear relaxation time k e =k s starts at values less than one (k e =k s ¼ 0:5) and increases linearly with increasing surfactant concentration, eventually reaching a plateau at roughly k e =k s % 1 [Bhardwaj et al (2007b)].…”

Section: Elongational Flow Of Wlm Solutionscontrasting

confidence: 99%

“…Differences between this elongational relaxation time and the characteristic shear relaxation time k s obtained from small amplitude oscillatory shear (SAOS) are related to the strong nonlinear deformation in CaBER experiments [Arnolds et al (2010); Sachsenheimer et al (submitted)]. The exponential diameter decay directly corresponds to an exponentially increasing viscosity which has its physical origin in the loss of entropy during stretching of, e.g., polymer molecules or wormlike micellar structures.…”

Section: B Capillary Breakup Extensional Rheometrymentioning

confidence: 99%

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Elongational deformation of wormlike micellar solutions

Sachsenheimer

Oelschlaeger

Müller

et al. 2014

Journal of Rheology

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We have investigated the uniaxial elongation behavior of six different wormlike micelle systems covering a broad range of surfactant concentrations cs and salt/surfactant ratios R using the capillary breakup elongational rheometry (CaBER). In the fast-breaking limit (high cs and R), filament lifetime tfil is controlled by the equilibrium shear modulus G0 and the breakage time λbr obtained from small oscillatory shear according to tfil/G0∝λbr2/3 and relaxation time ratios λe/λs≈1 are found. When reptation dominates (high cs, low R) λe/λs<1 is observed similar as for solutions of covalently bound polymers. In this concentration regime, the micellar structure seems not to be affected by the strong elongational flow. In contrast, high filament lifetimes up to 1000 s and λe/λs values up to 10 are observed at low cs irrespective of R. This indicates the formation of elongation-induced structures (EISs). A minimum viscosity and a minimum initial diameter are required for creating EIS. Additional filament stretching experiments indicate that a critical total deformation has to be exceeded for structure build-up. Finally, our experiments reveal a distinct difference regarding the dependence between solutions of linear and branched micelles of filament lifetime on viscosity suggesting that CaBER is a versatile means to distinguish between these structures.

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Section: Elongational Flow Of Wlm Solutionscontrasting

confidence: 99%

Section: B Capillary Breakup Extensional Rheometrymentioning

confidence: 99%

Elongational deformation of wormlike micellar solutions

Sachsenheimer

Oelschlaeger

Müller

et al. 2014

Journal of Rheology

Self Cite

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“…Also, several criteria have been suggested for the possibility of such flow instability, including extensibility parameters for polymer chains and dimensionless numbers. This phenomenon has been reported experimentally for a flexible polymer such as PEO (Arnolds et al 2010;Oliveira and McKinley 2005;Oliveira et al 2006;Sattler et al 2008), emulsions (Erni et al 2009), human saliva (Sattler et al 2012), and for the systems with rigid polymers such as xanthan gum solution drop falling under gravity (Smolka and Belmonte 2006) and DNA suspensions (Juarez and Arratia 2011).…”

Section: Introductionmentioning

confidence: 52%

“…For fluids with shear viscosity\10 3 Pa s, Capillary break-up extensional rheometry (CaBER) has received much attention during the past few years Tirtaatmadja et al 2006;McKinley and Tripathi 2000;Kheirandish et al 2008;Tripathi et al 2006;Plog et al 2005;Arnolds et al 2010). In CaBER, a fluid filament is subjected to step-strain and the mid-plane diameter of the filament undergoing capillary driven thinning is recorded as a function of time (Fig.…”

Section: Introductionmentioning

confidence: 99%

Extensional rheometry of cellulose ether solutions: flow instability

Vadodaria

English

2015

Cellulose

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Capillary breakup extensional rheometry of semi-dilute hydroxyethyl cellulose (HEC) solutions was performed under several step-stretch conditions. The resulting parameters, i.e. terminal steady state extensional viscosity (g E ) and the timescale for viscoelastic stress growth, commonly referred to as the extensional relaxation time (k E ) were found to be sensitive to the step-stretch conditions. The k E decreased with increasing step-strain as opposed to the g E . Prior to the filament break-up, a 'bead-onstring' instability was observed close to the mid-plane. It is believed that this instability originated from the accumulation of viscoelastic stresses near the filament neck leading to the 'elastic recoil' of the extended polymer chains. The reasons for this belief are discussed in detail with the perspective of the past literature. Such type of flow instability has been reported for the first time for a cellulosic system. Various dimensionless numbers were plotted for the HEC solutions and compared with those obtained from past studies for various biopolymers as well as synthetic polymers.

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“…[20][21][22][23][24] Capillary Breakup Extensional Rheometry (CaBER) has become a common method to study the elongational rheology of a wide range of dilute complex fluids. [25][26][27][28] However, conventional measurements from CaBER can be affected by fluid inertia and the dynamics of the end-plates. Limits on the separation speed of the endplates and other inertia-related issues have dramatic adverse effects on conventional CaBER measurements for liquids with low viscosity and low elasticity.…”

Section: Introductionmentioning

confidence: 99%

Micro-scale extensional rheometry using hyperbolic converging/diverging channels and jet breakup

Keshavarz

McKinley

2016

Biomicrofluidics

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Understanding the elongational rheology of dilute polymer solutions plays an important role in many biological and industrial applications ranging from microfluidic lab-on-a-chip diagnostics to phenomena such as fuel atomization and combustion. Making quantitative measurements of the extensional viscosity for dilute viscoelastic fluids is a long-standing challenge and it motivates developments in microfluidic fabrication techniques and high speed/strobe imaging of millifluidic capillary phenomena in order to develop new classes of instruments. In this paper, we study the elongational rheology of a family of dilute polymeric solutions in two devices: first, steady pressure-driven flow through a hyperbolic microfluidic contraction/expansion and, second, the capillary driven breakup of a thin filament formed from a small diameter jet (D j $ Oð100 lmÞ). The small length scale of the device allows very large deformation rates to be achieved. Our results show that in certain limits of low viscosity and elasticity, jet breakup studies offer significant advantages over the hyperbolic channel measurements despite the more complex implementation. Using our results, together with scaling estimates of the competing viscous, elastic, inertial and capillary timescales that control the dynamics, we construct a dimensionless map or nomogram summarizing the operating space for each instrument. Published by AIP Publishing. [http://dx

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Capillary breakup extensional rheometry (CaBER) on semi-dilute and concentrated polyethyleneoxide (PEO) solutions

Cited by 100 publications

References 30 publications

Elongational deformation of wormlike micellar solutions

Elongational deformation of wormlike micellar solutions

Extensional rheometry of cellulose ether solutions: flow instability

Micro-scale extensional rheometry using hyperbolic converging/diverging channels and jet breakup

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