A Direct Test on the Possibility of an Aggregate in Dispersion Being Disrupted by Shear Flow

Sun, Zhiwei; Li, Y.M.; Xu, Shenghua; Lou, Liren; Dai, Guoliang; Dong, Xian-Zi

doi:10.1006/jcis.2001.7761

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…Actually, apart from Brownian motion, it is necessary to take into account the influence of external forces, such as the dipoledipole interaction, ion-correlation forces, shear stresses, etc. [30][31][32][33][34][35][36][37]. Furthermore, biological objects can be substantially affected by the formation of electric double and hydrate layers.…”

Section: Aggregate Stabilitymentioning

confidence: 99%

Electrokinetic Properties and Aggregate Stability of Nanosized Biocolloids—Influenza Virus Dispersions

2005

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The electrical surface properties and aggregate stability of biological nanoparticles of three influenza virus strains are investigated by laser microelectrophoresis and flow ultramicroscopy. The differences in the character and kinetics of coagulation (reversible or superfast coagulation, the presence or absence of an induction period, spontaneous disaggregation of particles) are explained by the specific features of the formation and structure of an electric double layer of the strains under consideration and by the structural transformations of surface virion components.

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Section: Aggregate Stabilitymentioning

confidence: 99%

Electrokinetic Properties and Aggregate Stability of Nanosized Biocolloids—Influenza Virus Dispersions

2005

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“…Sun et al [75] proposed test systems for the investigation of the influence of the shear flow on the coagulation of poly(styrene) spherical latex particles (2 µm in size). It was shown that the shear rates up to 10.6 s -1 (in the first test) and 85 s -1 (in the second test) are insufficient for breaking aggregates formed by these latex particles.…”

Section: Shear Flowmentioning

confidence: 99%

Possible factors responsible for superfast coagulation of hydrosols

2008

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“…Physical methods of manipulating unlabeled particles in suspension include optical, dielectrophoretic, and ultrasonic − traps. The small focal volume of optical traps makes them suitable for holding single 6 particles or trapping preformed aggregates by focusing on a single particle, but they have not been applied to act as sinks where many-particle aggregates can be retained and grow. The single negative potential well (40 μm width) of a dielectrophoretic field cage has been employed to aggregate submicron latex beads, while a combination of this type of trap with an optical tweezers has been employed to quantify, in molecular terms, the interaction between a single biotin-coated cell and a coated latex particle .…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Trap To Monitor Morphology and Stability of Developing Microparticle Aggregates

Spengler

Coakley

2003

Langmuir

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Aggregation and flocculation of latex particles have been examined in an ultrasonic standing wave trap that draws microparticles from suspensions into a light-microscope prefocused central region of the pressure node plane. The ultrasound chamber had a single half-wavelength path length (λ/2 ) 0.25 mm) at its resonant frequency of 3.17 MHz. The full course of aggregate growth, in water or in 10 mM CaCl2, of 25 µm diameter latex particles was monitored by video microscopy. The particles formed two-dimensional aggregates in the nodal plane. Particles suspended in deionized water joined the aggregate both as single particles and as clusters. Incoming particles rolled over particles at the edge of the aggregate. The aggregate then adjusted its internal order to maintain a regular array of particles in apparent close contact. In contrast, particles in salt solutions interacted strongly on contact so that the aggregates grew as dendritic structures. The perimeter fractal dimensions of 1.15 and 1.59 in water and in salt, respectively, were typical of transport-limited and reaction-limited aggregation. When the ultrasonic exposure was terminated, the compact, low fractal dimension flocs disaggregated as they sedimented while the dendritic aggregates remained intact. It is shown that at surface separations of the order of 10 nm the acoustic particle interaction forces (dependent on the separation of centers of mass) are small compared to the van der Waals and electrostatic interaction forces (dependent on surface-surface separation) that normally control microparticle aggregation. It is concluded that the ultrasound did not significantly influence the net interactions that determine aggregate morphology and stability and that the ultrasonic trap technique holds promise for elucidating patterns of aggregate growth.

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A Direct Test on the Possibility of an Aggregate in Dispersion Being Disrupted by Shear Flow

Cited by 11 publications

References 17 publications

Electrokinetic Properties and Aggregate Stability of Nanosized Biocolloids—Influenza Virus Dispersions

Electrokinetic Properties and Aggregate Stability of Nanosized Biocolloids—Influenza Virus Dispersions

Possible factors responsible for superfast coagulation of hydrosols

Ultrasonic Trap To Monitor Morphology and Stability of Developing Microparticle Aggregates

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