Can nanoparticles stabilize microparticle suspension?

Chang, Yu‐Wei; Chang, Chia-Chang; Cheng, Wei-You

doi:10.1016/j.seppur.2011.03.028

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…These trend of results are in accordance to the experimental work conducted by Chang et al [65] on the aspect nanoparticle based stabilization of microparticle with respect to time. Further, the sharp drop in absorbance for hybrid colloidal system can be associated to the significant decrease in Al 2 O 3 particle concentration within the same period of observation as elucidated in Fig.…”

Section: Investigation Of Colloidal Stability Using Particle Absorbansupporting

confidence: 92%

Experimental investigation on the use of highly charged nanoparticles to improve the stability of weakly charged colloidal system

Zubir¹,

Badarudin²,

Kazi³

et al. 2015

Journal of Colloid and Interface Science

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Section: Investigation Of Colloidal Stability Using Particle Absorbansupporting

confidence: 92%

Experimental investigation on the use of highly charged nanoparticles to improve the stability of weakly charged colloidal system

Zubir¹,

Badarudin²,

Kazi³

et al. 2015

Journal of Colloid and Interface Science

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“…Alternately, a very recent study has been done on polystyrene microspheres in suspension with zirconia nanoparticles in solution at pH 5, a case where the zirconia nanoparticles were near their isoelectric point and the polystyrene were highly charged [31]. The results showed significant stabilization, based on the turbidity measurements as a function of time, with optimal nanoparticle concentrations of about 1.17%.…”

Section: Introductionmentioning

confidence: 99%

“…Hong and Willing measured the force between silica surfaces (micrometer-sized silica sphere and flat silica plate) in dispersions of zirconia nanoparticles, using colloidal probe atomic force microscopy (CP-AFM) at conditions similar to those used by Tohver et al The authors observed a slight inflection in the force profile measured at a nanoparticle volume fraction of 10 –5 , which they attributed to the formation of a nanoparticle halo. Chang et al measured the effect of adding weakly positively charged zirconia nanoparticles on the gravitational settling rate of polystyrene latex particles (highly negatively charged) . At low concentrations, the nanoparticles were able to reduce the settling rate, suggesting a more stable dispersion, which the authors attributed to nanoparticle halos.…”

Section: Introductionmentioning

confidence: 99%

“…Chang et al measured the effect of adding weakly positively charged zirconia nanoparticles on the gravitational settling rate of polystyrene latex particles (highly negatively charged). 17 At low concentrations, the nanoparticles were able to reduce the settling rate, suggesting a more stable dispersion, which the authors attributed to nanoparticle halos.…”

Section: ■ Introduction and Backgroundmentioning

confidence: 99%

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Stabilization of Weakly Charged Microparticles Using Highly Charged Nanoparticles

Herman

Walz

2013

Langmuir

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An experimental investigation was conducted to evaluate the possible use of highlycharged spherical nanoparticles to stabilize an aqueous dispersion of weakly-charged microspheres. At low pH values, the surface of silica is weakly charged, which leads to flocculation of colloidal suspensions of silica microspheres. Binary solutions of weakly charged silica microspheres and highly charged polystyrene latex nanoparticles result in adsorption of the nanoparticles onto the surface of the silica microspheres. This effectively "recharges" the silica spheres, with effective zeta potentials increased to the range that is unfavorable for flocculation of microspheres in a silica-only solution. However, this does not guarantee stability, and comparisons between positively charged amidine latex nanoparticles and negatively charged sulfate latex nanoparticles indicate that the degree of coverage plays an important role in the restabilization. The sulfate latex nanoparticles do not cover the surface sufficiently, and though they seemingly provide sufficient charge, the weakly charged patches of the exposed silica substrate can lead to flocculation. The amidine latex nanoparticles, on the other hand, cover the surface more completely, and effectively prevent flocculation of the silica microspheres. The mechanisms responsible for this different adsorption and stabilizing behavior are not entirely understood, as both the amidine and sulfate latex nanoparticles are of similar size and the magnitude of the zeta potentials of the different particle types are comparable.iii

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“…4 Chang et al conducted a series of experiments by adding various volume fractions of zirconia nanoparticles in negatively charged microlatex dispersions in water. 5 They confirmed that the zirconia nanoparticles do stabilize the microcolloidal suspension. McKee and Walz 6 used atomic force microscopy to measure the interaction force between a microsize glass sphere and a planar glass substrate (both negatively charged) in aqueous solutions containing highly negatively charged polystyrene or zirconia nanoparticles.…”

Section: Introductionmentioning

confidence: 84%

Decoration of Microparticles by Highly Charged Nanoparticles

Huang

Ruckenstein

2013

J. Phys. Chem. B

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A negatively charged microparticle is immersed into an aqueous solution containing highly negatively charged nanoparticles and an electrolyte. Using a modified Poisson-Boltzmann equation which takes into account the van der Waals interactions between microparticle and nanoparticles and in which the latter are treated as macro-ions, it was found that there are conditions under which the concentration of nanoparticles close to the microparticle becomes larger (even much larger) than the bulk one and halos are formed around the latter particles. Halos are formed when the van der Waals attractive interactions between the microparticle and nanoparticles are stronger than the repulsive interactions between the same particles plus the repulsive interactions between the nanoparticles.

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Can nanoparticles stabilize microparticle suspension?

Cited by 8 publications

References 14 publications

Experimental investigation on the use of highly charged nanoparticles to improve the stability of weakly charged colloidal system

Experimental investigation on the use of highly charged nanoparticles to improve the stability of weakly charged colloidal system

Stabilization of Weakly Charged Microparticles Using Highly Charged Nanoparticles

Decoration of Microparticles by Highly Charged Nanoparticles

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