Recent study of polymer latex dispersions

Dosho, Shin; Ise, Norio; Ito, Katsura; Iwai, Satoshi; Kitano, Hiromi; Matsuoka, Hideki; Nakamura, Hiroshi; Okumura, Hiroya; Ono, Takashi

doi:10.1021/la00026a008

Cited by 106 publications

(75 citation statements)

References 1 publication

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“…35 The tendency to form clusters or concentrated domains of ordered particles and dilute regions was observed in solutions of silica or latex spheres. [36][37][38][39] The destabilization of a mixture of colloidal particles differing in size was observed and explained by depletion forces and phase separation at low ionic strength. 40,41 Furthermore, many experimental studies performed over several past decades pointed out the importance of counterions.…”

Section: Resultsmentioning

confidence: 99%

Molecular Assembly of Metallacarboranes in Water: Light Scattering and Microscopy Study

et al. 2005

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Polyhedral metallacarboranes are used mainly as ion-pairing agents and recently have been recognized as potent inhibitors of HIV protease. They are characterized by exceptional hydrophobicity, rigid geometry, delocalized negative charge, ion-pairing behavior, and strong acidity of their conjugated acids. The completely novel phenomenon, association of these promising pharmaceutical tectons in aqueous solutions, is described here. The behavior of two structural types of metallacarboranes, [bis(1,2-dicarbollide)cobaltate(1-)] and bis[(3)-1,2-dicarbollylcobalt]-(3,6)-1,2-dicarbacanastide(2-)], in aqueous solution was studied by a combination of static and dynamic light scattering and microscopy methods. Spherical aggregates with radii of ca. 100 nm and fairly monodisperse nanostructures were found in aqueous solutions. The behavior of nanoaggregates is fairly complex and depends on the concentration and aging of the solutions. The particles are stabilized in the solution by counterions. The formation of larger clusters upon dilution of bis(1,2-dicarbollide)cobaltate(1-) solutions was observed. The secondary aggregation can be suppressed by addition of NaCl. Gel permeation chromatography measurements of sodium bis(1,2-dicarbollide)cobaltate(1-) show that the majority of matallacarborane molecules form nanoaggregates and only a small amount of the metallacarborane remains molecularly soluble or forms small oligomers.

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Section: Resultsmentioning

confidence: 99%

Molecular Assembly of Metallacarboranes in Water: Light Scattering and Microscopy Study

et al. 2005

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“…Under appropriate conditions, this leads to the spontaneous organization of the particles into a variety of crystalline structures, referred to as colloidal crystals [162]. When the electric screening length is shorter than the center-to-center distance between two spheres, the colloidal spheres will behave as hard spheres and will not influence each other until they are in physical contact; otherwise, they will behave as soft spheres [163].…”

Section: Colloidal Self-assemblymentioning

confidence: 99%

Self-assembly from milli- to nanoscales: methods and applications

Mastrangeli

Abbasi

Varel

et al. 2009

J. Micromech. Microeng.

230

202

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The design and fabrication techniques for microelectromechanical systems (MEMS) and nanodevices are progressing rapidly. However, due to material and process flow incompatibilities in the fabrication of sensors, actuators and electronic circuitry, a final packaging step is often necessary to integrate all components of a heterogeneous microsystem on a common substrate. Robotic pick-and-place, although accurate and reliable at larger scales, is a serial process that downscales unfavorably due to stiction problems, fragility and sheer number of components. Self-assembly, on the other hand, is parallel and can be used for device sizes ranging from millimeters to nanometers. In this review, the state-of-the-art in methods and applications for self-assembly is reviewed. Methods for assembling three-dimensional (3D) MEMS structures out of two-dimensional (2D) ones are described. The use of capillary forces for folding 2D plates into 3D structures, as well as assembling parts onto a common substrate or aggregating parts to each other into 2D or 3D structures, is discussed. Shape matching and guided assembly by magnetic forces and electric fields are also reviewed. Finally, colloidal self-assembly and DNA-based self-assembly, mainly used at the nanoscale, are surveyed, and aspects of theoretical modeling of stochastic assembly processes are discussed.

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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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Recent study of polymer latex dispersions

Cited by 106 publications

References 1 publication

Molecular Assembly of Metallacarboranes in Water: Light Scattering and Microscopy Study

Molecular Assembly of Metallacarboranes in Water: Light Scattering and Microscopy Study

Self-assembly from milli- to nanoscales: methods and applications

Structure of the nanobubble clusters of dissolved air in liquid media

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