Injectable shear-thinning xanthan gum hydrogel reinforced by mussel-inspired secondary crosslinking

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103292-103301 ◽  
Author(s):  
Zhijia Liu ◽  
Ping Yao
Keyword(s):  
Mechanical Strength ◽  
Xanthan Gum ◽  
Shear Thinning ◽  
Helical Strand

With a xanthan gum double helical strand network and dopamine-mediated crosslinking network, hydrogels possess injectable properties and enhanced mechanical strength.

scholarly journals Assessment of the Rheological Behavior of Polymer–Oxidant Mixtures and the Influence of the Groundwater Environment on Their Properties

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1698
Author(s):  
Qi Xu ◽  
Jiajun Chen ◽  
Xinran Song
Keyword(s):  
Xanthan Gum ◽  
Control Method ◽  
Shear Thinning ◽  
Mobility Control ◽  
Retention Rates ◽  
Viscosity Reduction ◽  
Leading Role ◽  
Salt Ions ◽  
Groundwater Environment ◽  
Water Ph

Shear-thinning polymers have been introduced to contaminant remediation in the subsurface as a mobility control method applied to mitigate the inefficient delivery of remedial agents caused by geological heterogeneity. Laboratory experiments have been conducted to assess the compatibility of polymers (xanthan and hydrolyzed polyacrylamide (HPAM)) and oxidants (KMnO4 and Na2S2O8) through quantitative evaluation of the viscosity maintenance, shear-thinning performance, and oxidant consumption. The mechanism that causes viscosity loss and the influence of the groundwater environment on the mixture viscosity were also explored. The xanthan–KMnO4 mixture exhibited the best performance in both viscosity retention and shear-thinning behavior with retention rates higher than 75% and 73.5%, respectively. Furthermore, the results indicated that xanthan gum has a high resistance to MnO4− and that K+ plays a leading role in its viscosity reduction, while HPAM is much more sensitive to MnO4−. The viscosity responses of the two polymers to Na2S2O8 and NaCl were almost consistent with that of KMnO4; salt ions displayed an instantaneous effect on the solution’s viscosity, while the oxide ions could cause the solution’s viscosity to decrease continuously with time. Since xanthan exhibited acceptable oxidant consumption as well, xanthan–KMnO4 is considered to be the optimal combination. In addition, the results implied that the effects of salt ions and the water pH on the mixture solution could be acceptable. In the 2D tank test, it was found that when xanthan gum was introduced, the sweeping efficiency of the oxidant in the low-permeability zone was increased from 28.2% to 100%. These findings demonstrated the feasibility of using a xanthan–KMnO4 mixture for actual site remediation.

Taylor vortices in Newtonian and shear-thinning liquids

1995 ◽  
Vol 449 (1935) ◽  
pp. 155-176 ◽  
Keyword(s):  
Aqueous Solution ◽  
Axial Velocity ◽  
Xanthan Gum ◽  
Cell Structure ◽  
Outer Wall ◽  
Shear Thinning ◽  
Taylor Number ◽  
Axial Component ◽  
Vortex Cell ◽  
Newtonian Case

The flow structure in a concentric annular geometry with a radius ratio of 0.506 has been investigated for inner cylinder (centrebody) rotation. Detailed velocity measurements made with a laser Doppler anemometer for an aqueous solution of glucose (Newtonian), at a Taylor number well above the critical value, reveal that the tangential velocity component has a periodic structure of the same wavelength as that for the axial component, but with the extrema corresponding to zero axial velocity. Higher values of the maximum axial velocity and velocity gradient are observed closer to the centrebody than at the outer wall, whilst the radial location of zero axial velocity in the vortex interior (i. e. the eye of the vortex) moves towards the outer wall with increasing Taylor number. Similar measurements for an aqueous solution of Xanthan gum, which is strongly shear thinning and slightly elastic, revealed that the asymmetry in the maximum axial velocities was more marked than for the Newtonian case with a significant radial shift in the location of the vortex eye towards the centrebody. It was also found that the vortices exhibit a slow axial drift in the direction opposite to the centrebody rotation vector, whereas there was zero drift in the Newtonian case. The vortex cell structure for the second non-Newtonian fluid, a Laponite/CMC aqueous blend, which is shear thinning and also thixotropic, was very similar to that for the Xanthan gum suggesting that the shear-thinning aspect of the fluid rheology for both non-Newtonian fluids was far more significant than either thixotropy or viscoelasticity. An axial drift was again apparent, but in the opposite direction to that for the Xanthan gum, indicating that this effect is associated with the differences in the rheological characteristics of the two fluids.

Strength-tunable printing of xanthan gum hydrogel via enzymatic polymerization and amide bioconjugation

2020 ◽  
Vol 56 (23) ◽  
pp. 3457-3460 ◽  
Author(s):  
Hui Pan ◽  
Bolin Zheng ◽  
Hongdou Shen ◽  
Meiyuan Qi ◽  
Yinghui Shang ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Xanthan Gum ◽  
Enzymatic Polymerization

Amide bioconjugation and interfacial enzyme polymerization for improving the mechanical strength of hydrogel bio-ink.

Supramolecular assembly of tetronic–adamantane and poly(β-cyclodextrin) as injectable shear-thinning hydrogels

2019 ◽  
Vol 7 (21) ◽  
pp. 3374-3382 ◽  
Author(s):  
Hyo Jin Lee ◽  
Phuong Thi Le ◽  
Ho Joon Kwon ◽  
Ki Dong Park
Keyword(s):  
Mechanical Strength ◽  
Supramolecular Assembly ◽  
Shear Thinning

Shear-thinning hydrogels with improved mechanical strength have been developed through host–guest interactions and the thermo-gelling effects of tetronic–adamantane and poly[β-CD] at 37 °C. The fabricated hydrogels showed injectability through a needle with excellent shear-thinning and recovery properties.

Flow characteristics inside shear thinning xanthan gum non-Newtonian droplets moving in rectangular microchannels

2021 ◽  
Vol 62 (10) ◽  
Author(s):  
Mengqi Li ◽  
Zhaomiao Liu ◽  
Yan Pang ◽  
Ju Wang ◽  
Yao Lu ◽  
...  
Keyword(s):  
Xanthan Gum ◽  
Flow Characteristics ◽  
Shear Thinning ◽  
Rectangular Microchannels

scholarly journals Effects of Ionic Strength on Lateral Particle Migration in Shear-Thinning Xanthan Gum Solutions

Micromachines ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 535 ◽  
Author(s):  
Mira Cho ◽  
Sun Ok Hong ◽  
Seung Hak Lee ◽  
Kyu Hyun ◽  
Ju Min Kim
Keyword(s):  
Ionic Strength ◽  
Rheological Properties ◽  
Viscoelastic Fluid ◽  
Xanthan Gum ◽  
Viscoelastic Fluids ◽  
Shear Thinning ◽  
Particle Migration ◽  
Cell Counting ◽  
Contour Length ◽  
Wide Range

Viscoelastic fluids, including particulate systems, are found in various biological and industrial systems including blood flow, food, cosmetics, and electronic materials. Particles suspended in viscoelastic fluids such as polymer solutions migrate laterally, forming spatially segregated streams in pressure-driven flow. Viscoelastic particle migration was recently applied to microfluidic technologies including particle counting and sorting and the micromechanical measurement of living cells. Understanding the effects on equilibrium particle positions of rheological properties of suspending viscoelastic fluid is essential for designing microfluidic applications. It has been considered that the shear-thinning behavior of viscoelastic fluid is a critical factor in determining the equilibrium particle positions. This work presents the lateral particle migration in two different xanthan gum-based viscoelastic fluids with similar shear-thinning viscosities and the linear viscoelastic properties. The flexibility and contour length of the xanthan gum molecules were tuned by varying the ionic strength of the solvent. Particles suspended in flexible and short xanthan gum solution, dissolved at high ionic strength, migrated toward the corners in a square channel, whereas particles in the rigid and long xanthan gum solutions in deionized water migrated toward the centerline. This work suggests that the structural properties of polymer molecules play significant roles in determining the equilibrium positions in shear-thinning fluids, despite similar bulk rheological properties. The current results are expected to be used in a wide range of applications such as cell counting and sorting.

Rheological Properties of Limited Enzymatic Hydrolyzed Wheat Gluten

2012 ◽  
Vol 550-553 ◽  
pp. 1535-1539
Author(s):  
Zhang Cun Wang ◽  
Le Jing Li ◽  
Xue Wei Zhao ◽  
Sheng Wen Cui
Keyword(s):  
Rheological Properties ◽  
Sodium Alginate ◽  
Apparent Viscosity ◽  
Xanthan Gum ◽  
Wheat Gluten ◽  
Shear Thinning ◽  
Effects Of Temperature ◽  
Complex Solutions

The rheological properties of Limited Enzyme-hydrolyzed Wheat Gluten (LHWG) and its complex solutions with xanthan gum (XG), sodium alginate (SA) or gelatin were researched by Brookfield DV-Ⅱ+Pro Viscometer. The results showed that they all exhibited typical shear-thinning behavior and the higher LHWG concentration, the more evident of the shear thinning was. The effects of temperature on the rheology of LHWG were very complicated based on the concentration. The apparent viscosity of 300 mg/mL LHWG (20°C) was higher than that of 100 mg/mL and 200 mg/mL, and showed fluctuation between 20°C and 90°C, which were strongly different from that of low LHWG solution. However, the rheological properties of LHWG were influenced slightly by shearing time.

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