Stability and Rheology of Aqueous Suspensions

Večeř, Marek; Pospíšil, Jiří

doi:10.1016/j.proeng.2012.07.564

Cited by 25 publications

(11 citation statements)

References 9 publications

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“…The observed IEP for the ASP-synthesized γ-Fe 2 O 3 is significantly lower than that reported for the maghemite nanoparticles synthesized by co-precipitation (pH IEP = 6.6 [20]). Generally, the particles with a ζ-potential higher than +30 mV or lower than −30 mV are considered to be electrostatically stable in colloids; at lower ζ-potential values, the particles are prone to agglomeration [21,22]. Note that the ζ-potential of non-stabilized ASP-synthesized γ-Fe 2 O 3 nanoparticles is below these threshold values in acidic medium.…”

Section: Resultsmentioning

confidence: 99%

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Goldt¹,

Polyakov²,

Sorkina³

et al. 2019

Nanosystems: Phys. Chem. Math.

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Superparamagnetic iron oxide γ-Fe 2 O 3 (maghemite) nanoparticles (SPION) encapsulated into water-soluble microspheres of rock salt were synthesized via a new aerosol spray pyrolysis procedure. Humic acids (HA) were employed to stabilize the aqueous suspensions of γ-Fe 2 O 3 nanoparticles released upon dissolution of the NaCl matrix. The effect of HA on the surface charge of maghemite-based colloids was studied in pH range of 3 -10. Humic polyanions compensate positive charges on a hydrated γ-Fe 2 O 3 surface resulting in strongly negative ζ-potential (< −40 mV) of colloid even in acidic environment. In neutral and alkaline environment, ζ-potential of maghemite-based colloid drops below −55 mV; thus, HA should effectively stabilize the nanoparticle colloid over the whole pH range studied. Meanwhile, bare maghemite SPION at pH 3 -6 have ζ-potential in the +20 mV to −20 mV range (isoelectric point at pH 4.35), which is insufficient for electrostatic stabilization of the suspensions. The absence of embryotoxicity of HA-stabilized nanoparticles was demonstrated.

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Section: Resultsmentioning

confidence: 99%

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Goldt¹,

Polyakov²,

Sorkina³

et al. 2019

Nanosystems: Phys. Chem. Math.

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“…The interesting noticeable point is that suspension prepared with charota gum was slightly acidic compared to the higher than other prepared suspensions with acacia, gelatine, and tragacanth. Suspension prepared with charota gum was found better because the slightly acidic nature of oral formulation is suitable for palatability, consumer acceptance, and long-term stability [20]. The order of zeta potential amplitude of the tested suspension formulation prepared with a different suspending agent was acacia>tragacanth>gelatine> Cassia tora.…”

Section: Resultsmentioning

confidence: 97%

Charota (Cassia tora) Gum: A Potential Element as Suspending Agent, An Investigation of Suitability forDevelopment of Paracetamol Suspension

Sarwa¹,

Vishwakarma²,

Suryawanshi³

et al. 2022

IGJPS

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Background: Charota (Cassia tora)gum is well reported as an additivefor food product and generally recognized as safe” (GRAS). It is obtained from the seedof the herbaceousplantsof the Caesalpiniaceaefamily. The plant's seedcontainsgluco-mannose polysaccharides, which swell in water and form a colloidaldispersion with increasing viscosity.This property of the gum was exploredto use as a suspending agent for the preparation ofparacetamolsuspension. Result: In the present investigation, charota gum was extracted from the plant and used as a suspending agent in a range of 2-4% w/v in preparation of paracetamol suspension(5% w/v). The investigation has beenperformed comparedwith gum acacia, tragacanth,and gelatin at a similar range of 2-4% w/v.The parameters like sedimentation profile, rheological studies, redispersibility, pH, anddissolution rate were determinedtoevaluatesuspending abilityof Cassia toragum. Conclusion: A comparative datawith other gum reported a higher viscosity and lowest zeta potential for the suspension prepared with Charota gum. At different concentrations, itshowed better suspending ability and redispersibility compare, and it was stable throughout the storage period of 6 weeks. The study's dataconclude that charota gum produced flocculated suspension,redispersedintheleast no of shakespost sedimentation.©2022iGlobal Research and PublishingFoundation. All rights reserved.Cite this article as:Sarwa, K.K.; Vishwakarma, P.K.; Suryawanshi, V.K.; Uraon, D.;Sao, M.Charota (Cassia tora) Gum: A Potential Element as Suspending Agent, An Investigation of Suitability For Development of Paracetamol Suspension.Indo Global J. Pharm. Sci., 2022; 12:228-236.

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“…The rheological behaviour of Al 2 O 3 slurry with different wt.% of carbon fiber were evaluated with a rheometer (MCR502, Anton Paar, Germany) in a room temperature. 30) The oscillation mode was measured to study the visco-elas- ticity. Dynamic viscoelasticity was measured by the oscillation method using the cone-cup type configuration (CC27).…”

Section: Rheological Propertiesmentioning

confidence: 99%

“…Taking the function of shear stress in amplitude sweep mode, the yield point can be checked to overview the limit of the linear viscoelastic (LVE) range. 30) The three interval thixotropy test (3ITT) was taken to check the thixotropic behavior of the suspension. In 3ITT system the tests are done in three different time intervals with various conditions as follows.…”

Section: Rheological Propertiesmentioning

confidence: 99%

“…28) Air bubbles are incorporated directly in the colloidal suspension by mechanical frothing with generally available hand mixture, which kept in room temperature to get dried and to maintain the P structure of bubbles. 29,30) This paper reports the evolution of the colloidal properties, wet foam analysis and mechanical properties of Al 2 O 3 porous ceramics with various wt.% of carbon fiber, prepared by a direct foaming. Hertzian indentation test was carried out to check the damage behavior under constrained loading conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Carbon Fiber on Mechanical Behaviour of Al2O3 Porous Ceramics

Basnet¹,

Lim²,

Lee³

et al. 2019

J. Korean Ceram. Soc

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This study reports the improvement of mechanical properties of Al 2 O 3 porous ceramics from colloidal suspension with the addition of carbon fiber by direct foaming. The initial colloidal suspension of Al 2 O 3 was partially hydrophobized by surfactant to stabilize wet foam with the addition of carbon fiber from 2 to 8 wt% as stabilizer. The influence of carbon fiber on the air content, bubble size, pore size and pore distribution in terms of wet foam stability and physical properties of porous ceramics were discussed. The viscosity of the colloidal suspension was increased giving solid like properties with the increased in carbon fiber content. The mechanical properties of the sintered porous samples were investigated by Hertzian indentation test. The results show the wet foam stability of more than 90% corresponds to compressive loading of 156.48 N and elastic modulus of 57.44 MPa of sintered sample with 8 wt% of carbon fiber content.

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Stability and Rheology of Aqueous Suspensions

Cited by 25 publications

References 9 publications

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Charota (Cassia tora) Gum: A Potential Element as Suspending Agent, An Investigation of Suitability forDevelopment of Paracetamol Suspension

Effects of Carbon Fiber on Mechanical Behaviour of Al2O3 Porous Ceramics

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