Rheological Evidence for the Silica-Mediated Gelation of Xanthan Gum

Oh, Minho; So, Jae-Hyun; Yang, Seung‐Man

doi:10.1006/jcis.1999.6325

Cited by 73 publications

(29 citation statements)

References 29 publications

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“…The input shear energy, with increasing shear rate, tends to align anisotropic molecules and disaggregate large clusters; thereby dispersing molecules arranged along the flow direction and thereby reducing the overall hydrodynamic drag. This reduction in turn reduces the viscosity (Oh, So, & Yang, 1999). Similar rheological behaviors are observed in xanthan gum solutions, as shown in Fig.…”

Section: Critical Aggregation Concentrationsupporting

confidence: 78%

“…The dynamic modulus of aqueous polysaccharide solutions increases with increasing concentration, and the overlapping frequency (the frequency corresponding to the crosspoint of G and G ) gradually decreases. G of diutan gum is greater than G when the concentration exceeds 1.25 g L −1 in the experimental frequency range, indicating that the elastic component is dominant in the viscoelasticity and a gel-like structure is formed (Nitta, Takahashi, & Nishinari, 2009;Oh et al, 1999). For xanthan gum, G is lower than G at low concentrations (<1.00 g L −1 ), showing the typical nature of ordered structure.…”

Section: Effect Of the Concentrationmentioning

confidence: 84%

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Rheological properties and thickening mechanism of aqueous diutan gum solution: Effects of temperature and salts

Gong

Dong

et al. 2015

Carbohydrate Polymers

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Section: Critical Aggregation Concentrationsupporting

confidence: 78%

Section: Effect Of the Concentrationmentioning

confidence: 84%

Rheological properties and thickening mechanism of aqueous diutan gum solution: Effects of temperature and salts

Gong

Dong

et al. 2015

Carbohydrate Polymers

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“…In the low shear rate, stretching polysaccharide molecules intertwine to form aggregates, displaying a high viscosity due to the large fluid flow resistance. With increasing the shear rate, the aggregates are destroyed, and the molecules arrange gradually along the flow direction, resulting in the decrease of apparent viscosity . Figure presents the viscosity retention rates ( φ , the ratio of the apparent viscosity at different temperatures to the initial viscosity at 25°C) of welan gum and xanthan gum solutions at different temperatures when the shear rate is 7.34 s −1 .…”

Section: Resultsmentioning

confidence: 99%

“…Figure illustrates G′ and G″ as a function of the frequency for welan gum and xanthan gum solutions. Obviously, the elasticity component of the welan gum solution is the dominating factor, implying that the gel‐like structure is formed within the solution . The xanthan gum solution shows the typical nature of the disordered structure that G″ is higher than G′ and the strong dependence of modulus on the frequency.…”

Section: Resultsmentioning

confidence: 99%

The displacement efficiency and rheology of welan gum for enhanced heavy oil recovery

et al. 2014

Polym. Adv. Technol.

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The displacement efficiency of welan gum on enhanced heavy oil recovery has been investigated by comparing that of xanthan gum which is commonly used for polymer flooding, and it is found that the displacement efficiency of biopolymer welan gum is higher (>7.0 % at the normal permeability) than that of xanthan gum. In‐depth rheological investigations show that both storage modulus and loss modulus of welan gum solution are higher than those of xanthan gum solutions at the same concentration, temperature and salinity. The higher displacement efficiency for enhanced heavy oil recovery by welan gum is mainly caused by its stronger ability to form aggregates. Although the molecular weight of welan gum is lower than that of xanthan gum, the aggregates of welan gum molecules help to improve the sweep efficiency. It is proposed that welan gum improves oil recovery by drawing and dragging on the residual oils which is derived from the interlinked network structures formed by the adjacent double helices in the arrangement of the zipper model. The intermolecular structures formed by zipper model are stable in high temperature and high salinity condition. Copyright © 2014 John Wiley & Sons, Ltd.

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“…On the other hand, the XG chains become more rigid in ASW due to the collapse of side chains along the polymer backbone. 46 These factors indicate the different morphologies of sedimentation in DI water and ASW. Additional results on TEM image (see the Supporting Information, Figure S2) show that silica particles in DI water are distributed independently.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Novel and Environmentally Friendly Oil Spill Dispersant Based on the Synergy of Biopolymer Xanthan Gum and Silica Nanoparticles

Bao

et al. 2016

ACS Sustainable Chem. Eng.

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The potential toxicity of existing chemical dispersants on the marine environment has motivated the search for environmentally friendly dispersants with excellent dispersion ability. Here, an effective Pickering emulsifier is developed based on the synergy of natural biopolymer, Xanthan Gum (XG), and silica nanoparticles. The oil−in−seawater emulsion stabilized by a combination of XG and silica demonstrates great stability and smaller droplet size, which is favorable for the following natural degradation of oil. The synergistic emulsification mechanism has been investigated systematically. The presence of XG favors the adsorption of silica nanoparticles at the oil−seawater interface and also is considerably effective in enhancing the viscosity of continuous phase. These contributions of XG slow down the droplet coalescence and creaming significantly. Confocal laser scanning microscope (CLSM) and scanning electron microscope (SEM) images of emulsions indicate a thick layer of aggregated XG/silica particles at the oil− water interface. This thick layer provides an effective steric barrier. In this study, the synergy between XG and silica not only enhances the dispersion effectiveness, but also reduces the amount of nanoparticles dramatically. This finding opens up a new path for the development of a novel, high efficiency, ecologically acceptable, and cheaper dispersant for emulsifying crude oil following a spill.

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Rheological Evidence for the Silica-Mediated Gelation of Xanthan Gum

Cited by 73 publications

References 29 publications

Rheological properties and thickening mechanism of aqueous diutan gum solution: Effects of temperature and salts

Rheological properties and thickening mechanism of aqueous diutan gum solution: Effects of temperature and salts

The displacement efficiency and rheology of welan gum for enhanced heavy oil recovery

Novel and Environmentally Friendly Oil Spill Dispersant Based on the Synergy of Biopolymer Xanthan Gum and Silica Nanoparticles

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