Rheological behavior of xanthan gum solution related to shear thinning fluid delivery for subsurface remediation

Zhong, Lirong; Oostrom, Martinus; Truex, Michael J.; Vermeul, Vincent R.; Szecsody, James E.

doi:10.1016/j.jhazmat.2012.11.028

Cited by 197 publications

(110 citation statements)

References 40 publications

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“…Thus, at low polymer content the viscosity of XG solutions will decline upon the addition of salts, which increases ionic strength 12,22 . Bergmann et al (2008) observed a viscosity decrease in a 0.15% XG solution when ion content was increased 12 .…”

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

“…Bergmann et al (2008) observed a viscosity decrease in a 0.15% XG solution when ion content was increased 12 . This phenomenon occurs because in dilute solutions charge screening with calcium ions decreases the polymer's interaction with water; allowing the XG chains to assume ordered helical molecular conformations which occupy a smaller hydrodynamic volume leading to a decrease in viscosity 22 . Comparatively, at higher XG concentration, the interaction between the polymer molecules increases as salt content increases 3,10,22 .…”

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

“…This effect outweighs the reduction in hydrodynamic volume of the molecules, and hence viscosity increases. It has been hypothesized that the increase in viscosity is caused by ion bridging, in which either an inter-molecular or intra-molecular crosslink is formed; subsequently increased interaction between the polymer chains induces a more rigid network 22 . Figure 3 represents the apparent viscosity of the 1% XG solutions at different shear rates.…”

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

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Incorporation of calcium salts into xanthan gum matrices: hydration, erosion and drug release characteristics

Groves

Chaw

2014

Drug Development and Industrial Pharmacy

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Xanthan gum, a hydrophilic biopolymer with modified release properties, was used to produce directly compressed matrix tablets containing a model drug, Sodium paminosalicylate. Three formulations were prepared, each containing a different calcium dihydrate salt: Calcium Chloride, Calcium Sulfate or Dibasic Calcium Phosphate. The aim of the investigation was to relate the calcium ion content and solubility of the calcium salt to the in vitro drug release profile of the xanthan matrices. Tablet hydration, erosion and drug release were determined in distilled water using the BP paddle method. The data showed that the overall drug release was the greatest with addition of calcium Sulfate, followed by Calcium Chloride and dibasic Calcium Phosphate. The chloride salt formulation displayed the greatest percentage erosion due to rapid mass loss during the initial phase, followed by those with sulfate or phosphate salts. As xanthan gel viscosity increased and drug release was also found to be lower. It can be concluded that drug release is influenced by the solubility of the salt present in the formulation, since these parameters determine the viscosity and structure of the gel layer.

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Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

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Incorporation of calcium salts into xanthan gum matrices: hydration, erosion and drug release characteristics

Groves

Chaw

2014

Drug Development and Industrial Pharmacy

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“…The linear region of the plots of log (′) as a function of log (ω) can be applied to the power law model (Zhong et al 2013), which is similar to the steady shear-thinning phenomenon, expressed as,…”

Section: Effects Of Solids Concentration On the Viscosity Of Bamboo Kmentioning

confidence: 99%

Study on the Dynamic Viscoelasticity of Bamboo Kraft Black Liquor

Xu¹,

Zhang²,

Sun³

et al. 2016

BioResources

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The dynamic viscoelasticity of bamboo kraft pulping black liquor under various temperatures (ranging from 50 to 80 °C) and solids concentrations (60 to 80 wt.%) was studied. Rotational rheometer analysis data indicated that the viscoelastic motion law with a high solids concentration in black liquor was in accordance with the Kelvin model, and black liquor with a medium concentration conformed to the Maxwell model. As a result, the temperature and solids concentration greatly influenced the dynamic viscoelasticity of bamboo kraft pulping black liquor. For instance, the modulus increased as the solids concentration increased, indicating that the viscous component of black liquor was prominent. For this reason, it was easier to soften the bamboo black liquor, providing a favorable condition for the pure viscosity of black liquor. Steady shear thinning was apparent during the frequency shear process. The dynamic viscosity, storage viscosity, and complex viscosity of the black liquor decreased as the shear frequency increased. The quantitative relationship between dynamic viscosity and angular frequency can be described using the Power Law model.

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“…These solutions show strong shear-thinning behavior over a range of polymer concentrations and salinities, and when mixed with a variety of remedial amendments (Zhong et al 2013). In the laboratory, xanthan-containing STFs have been used to enhance the delivery of particulate suspensions (Comba and Sethi 2009;Comba et al 2011;Vecchia et al 2009;Xue and Sethi 2012) and remedial amendment emplacement into low-permeability zones in laboratory 2-D flow cell heterogeneous systems (Chokejaroenrat et al 2013(Chokejaroenrat et al , 2014Martel et al 1998;Robert et al 2006;Smith et al 2008;Silva et al 2012;Zhong et al 2008Zhong et al , 2011.…”

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confidence: 99%

Remedial Amendment Delivery Near the Water Table Using Shear Thinning Fluids: Experiments and Numerical Simulations

et al. 2014

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The use of non-Newtonian shear thinning fluids (STFs) containing xanthan is a potential enhancement for emplacing a solute amendment near the water table and within the capillary fringe. Most research to date related to STF behavior has involved saturated and confined conditions. A series of flow cell experiments were conducted to investigate STF emplacement in variable saturated homogeneous and layered heterogeneous systems. Besides flow visualization using dyes, amendment concentrations and pressure data were obtained at several locations. The experiments showed that injection of STFs considerably improved the subsurface distribution near the water table by mitigating preferential flow through higher permeability zones compared to no-polymer injections. The phosphate amendment migrated with the xanthan STF without retardation. Despite the high viscosity of the STF, no excessive mounding or preferential flow were observed in the unsaturated zone. The STOMP simulator was able to predict the experimentally observed fluid displacement and amendment concentrations well. Based on the observed pressure gradients and concentration data in layers of differing hydraulic conductivity, cross flow between layers was identified as the main mechanism transporting STFs into lower permeability layers.

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Rheological behavior of xanthan gum solution related to shear thinning fluid delivery for subsurface remediation

Cited by 197 publications

References 40 publications

Incorporation of calcium salts into xanthan gum matrices: hydration, erosion and drug release characteristics

Incorporation of calcium salts into xanthan gum matrices: hydration, erosion and drug release characteristics

Study on the Dynamic Viscoelasticity of Bamboo Kraft Black Liquor

Remedial Amendment Delivery Near the Water Table Using Shear Thinning Fluids: Experiments and Numerical Simulations

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