Interaction forces between colloidal particles in liquid: Theory and experiment

Liang, Yuncheng; Hilal, Nidal; Langston, Paul; Starov, Victor

doi:10.1016/j.cis.2007.04.003

Cited by 442 publications

(332 citation statements)

References 145 publications

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“…The propagation mechanism with interparticle interactions encompasses two classes of phenomena, namely, contact and noncontact interactions, with the former acting only when two particles are touching each other. 55 These are briefly described in the following.…”

Section: Model Formulationmentioning

confidence: 99%

Universal Breakup of Colloidal Clusters in Simple Shear Flow

Harshe

Lattuada

2016

J. Phys. Chem. B

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ABSTRACT:We have studied the long-term dynamics of shear-induced breakage of individual colloidal clusters, covering a wide range of fractal dimensions, using Stokesian dynamics. We found that the time evolution of the normalized average size of the fragments generated by the breakup process could be scaled using a unique dimensionless time defined by multiplying the real time with the cluster breakage rate constant (τ = t·k B ). Clusters with different masses but the same fractal dimension exhibited almost identical breakage dynamics when exposed to equal overall hydrodynamic forces (ηγR g,0 2 ). The steady-state values of the average size, mass, and standard deviation of fragment mass distribution showed a universal scaling depending only on the overall hydrodynamic force, irrespective of the initial cluster properties. We also identified two asymptotic regimes for the evolution of the fractal dimension, ⟨d f ⟩, of fragments: open clusters (d f ≤ 2

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Section: Model Formulationmentioning

confidence: 99%

Universal Breakup of Colloidal Clusters in Simple Shear Flow

Harshe

Lattuada

2016

J. Phys. Chem. B

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“…However, some experimental data obtained in recent years obviously have contradicted the concept of screening ionic shell with absolute prevalence of counter-ions. Above all, this concerns the experimental proof of attraction of likely charged macro-particles in aqueous solutions of salts under certain conditions [72][73][74][75][76][77][78][79][80][81][82][83][84][85], which contradicts the Deryaguin-Landau-Verwey-Overbeek (DLVO) theory [86,87] based on the model of the Debye screening (29). Such contradictory facts also include recent experimental results on electrophoresis of macro-particles in solutions of various salts, indicating an ambiguous dependence of the electrophoretic mobility of particles on the polarity of their surface charge [88][89][90].…”

Section: Adsorption Of Ions and Screening Of Strongly Charged Gas Bubmentioning

confidence: 99%

Structure of the nanobubble clusters of dissolved air in liquid media

et al. 2011

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A qualitative model of the nucleation of stable bubbles in water at room temperature is suggested. This model is completely based on the property of the affinity of water at the nanometer scale; it is shown that under certain conditions the extent of disorder in a liquid starts growing, which results in a spontaneous decrease of the local density of the liquid and in the formation of nanometer-sized voids. These voids can serve as nuclei for the following generation of the so-called bubstons (the abbreviation for bubbles, stabilized by ions). The model of charging the bubstons by the ions, which are capable of adsorption, and the screening by a cloud of counter-ions, which are incapable of adsorption, is analyzed. It was shown that, subject to the charge of bubston, two regimes of such screening can be realized. At low charge of bubston the screening is described in the framework of the known linearized Debye-Huckel approach, when the sign of the counterion cloud preserves its sign everywhere in the liquid surrounding the bubston, whereas at large charge this sign is changed at some distance from the bubston surface. This effect provides the mechanism of the emergence of two types of compound particles having the opposite polarity, which leads to the aggregation of such compound particles by a ballistic kinetics.

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“…Dentre as três, duas envolvem dipolos induzidos e permanentes, e a terceira é considerada a força mais fundamental e universal, sendo a mais importante contribuição da interação total de van der Waals. 47 Esta força é a chamada London-van der Waals, primeiramente postulada por van der Waals em 1873 e depois explicada por London em 1930. 48 Deste modo, a interação de van der Waals entre átomos e moléculas podem ser de três tipos: dipolo-dipolo, dipolo-dipolo induzido e interação de London.…”

Section: Interação Lifshitz-van Der Waals (Lw)unclassified

Aspectos coloidais da adesão de micro-organismos

Araújo¹,

Andrade²,

Carvalho³

et al. 2010

Quím. Nova

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Recebido em 17/11/09; aceito em 21/4/10; publicado na web em 1/9/10 COLLOIDAL ASPECTS OF BACTERIAL ADHESION. The ability of bacteria to attach to surface and develop into a biofilm has been of considerable interest to food industry. Electrostatic, Lifhistz-van der Waals and Lewis acid-base forces are usually considered responsible for the interactions at the interface of the bacterial adhesion. The study of microbial adhesion thermodynamic is important because it represents the reflection of microbial surface and food processing surface physicochemical characteristics. This review examines the most important aspects involved in bacterial attachment to a surface with emphases in thermodynamics of adhesion process.Keywords: bacterial adhesion; biofilm; microbial surface thermodynamics. INTRODUÇÃOA adesão bacteriana é importante em um grande número de processos tecnológicos, envolvendo desde a microbiologia médica e patológica, passando pela indústria de alimentos e engenharia de meio ambiente até a área de ciência de biomateriais. 1A adesão de micro-organismos a superfícies é um fenômeno que ocorre naturalmente em meios aquosos e depende das propriedades superficiais (tensão superficial, entalpia superficial por unidade de área, composição da superfície, etc.) das interfaces dos suportes de adesão (aço, polímeros, mármore, etc.) e das membranas dos micro-organismos. Além disso, as propriedades microbiológicas e as características do meio circundante, tais como temperatura, pH, força iônica e disponibilidade de nutrientes, determinam, em muitos sistemas, o processo de adsorção. 1 A formação de um biofilme inclui muitas etapas, mas um pré-requisito é a adesão das células microbianas à superfície. Estudos recentes das propriedades de adesão de bactérias têm mostrado que, em alguns casos, as características físico-químicas da superfície da célula contribuem determinantemente no processo de adesão. 2A adesão e a formação de biofilmes microbianos podem ser indesejáveis, sob diversos aspectos, em várias áreas de aplicação. A presença do biofilme em dispositivos médicos implantados já foi descrita em lentes de contato, cateteres venosos centrais, tubos endotraqueais, dispositivos intrauterinos, válvulas cardíacas mecânicas, marcapassos, cateteres de diálise peritoneal, próteses articulares, tubos de timpanostomia, cateteres urinários e de derivação ventrículo-peritoneal.3 Na indús tria de alimentos, a adesão e a formação de biofilme podem tornar o pro cesso de cloração da água menos eficiente; 4 reduzir a eficiência de transferência de energia na forma de calor em trocadores térmicos; diminuir o fluxo em tubulações; desencadear processos corrosivos e, principalmente, se tornarem fon tes de contaminação microbiana.5 Sob o aspecto microbiológico, a adesão pode constituir-se de mi cro-organismos alteradores e/ou patogênicos, que resultam em sérios problemas de higiene, de saúde pública ou de ordem econômica. 6 Por outro lado, em alguns casos, o processo de adesão ou biofilme pode ser desejável, a exemplo daqueles existentes ...

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Interaction forces between colloidal particles in liquid: Theory and experiment

Cited by 442 publications

References 145 publications

Universal Breakup of Colloidal Clusters in Simple Shear Flow

Universal Breakup of Colloidal Clusters in Simple Shear Flow

Structure of the nanobubble clusters of dissolved air in liquid media

Aspectos coloidais da adesão de micro-organismos

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