Charge screening effects on filament dynamics in xanthan gum solutions

Smolka, Linda B.; Belmonte, Andrew

doi:10.1016/j.jnnfm.2006.01.012

Cited by 26 publications

(11 citation statements)

References 30 publications

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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: Introductionsupporting

confidence: 52%

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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Section: Introductionsupporting

confidence: 52%

Extensional rheometry of cellulose ether solutions: flow instability

Vadodaria

English

2015

Cellulose

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“…This is due the fact that xanthan gum itself shows lower surface tension in aqueous solution. [36] Nedjhioui et al . [4] of CAC, PSP, and surface tension at PSP for different surfactant-polymer combinations are shown in Table 1 along with the CMC of two surfactant solutions.…”

Section: Surface Tension Of Surfactant-polymer Mixturesmentioning

confidence: 99%

Interaction between aqueous solutions of polymer and surfactant and its effect on physicochemical properties

Khan

Samanta

Ojha

et al. 2008

Asia-Pacific J Chem Eng

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Interaction between water-soluble polymers and anionic surfactants has been studied by surface tension and conductivity measurements. Sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (SDBS) were used as surfactant while polyacrylamide (PAA), commercial grade partially hydrolyzed polyacrylamide (PHPA), and xanthan gum were used as water-soluble polymers for the present study. The behavior of surfactant-polymer interaction was found to be dependent on both surfactant and polymer concentrations. After the critical aggregation concentration (CAC), interaction between the water-soluble polymer and surfactants was started and above the polymer saturation point (PSP) polymer was saturated by surfactant with no further change of surface tension and conductivity of the solution. It has also been found that alkali (NaOH) and salts (Na 2 CO 3 , NaCl) have significant influence on the polymer-surfactant interaction. 

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“…Poole and co‐workers looked at the effect of “stiff” scleroglucan on CaBER experiments to obtain the relaxation time in extension 44. Smolka and Belmonte investigated the effect of ionic strength of Xanthan gum solutions,45 however, the structural change and its effect on the extensional rheological properties are in this case coupled with an expansion of the polymer coil due to varying electrostatic interactions.…”

Section: Introductionmentioning

confidence: 99%

Extensional Flow and Relaxation of Semi‐dilute Solutions of Schizophyllan

Dier

Mathues

Clasen

2013

Macro Materials & Eng

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Capillary thinning experiments of semi‐dilute solutions of schizophyllan in water and DMSO are performed to determine the relaxation behavior in extensional flows as experienced, for example, in the flow through porous media in enhanced oil recovery. The extensional relaxation time λE is found to scale with concentration following a dissimilar power‐law dependency for the two solvents, λE ∝ c1.52 in water and λE ∝ c0.90 in DMSO. It is shown that the extensional flow fields are strong enough to break, and prevent the rebuilding of, intermolecular structures, due to hydrogen bonding that was observed to alter the viscoelastic response in shearing flows of aqueous schizophyllan solutions.

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Charge screening effects on filament dynamics in xanthan gum solutions

Cited by 26 publications

References 30 publications

Extensional rheometry of cellulose ether solutions: flow instability

Extensional rheometry of cellulose ether solutions: flow instability

Interaction between aqueous solutions of polymer and surfactant and its effect on physicochemical properties

Extensional Flow and Relaxation of Semi‐dilute Solutions of Schizophyllan

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