aggregation – TechConnect Briefs

Numerical Investigation Of Rigid Microparticles Dynamics: Aggregation And Clogging Phenomena In Microfluidics By Discrete Element Method (DEM) And CFD Coupling

Shahzad K., Van Aeken W., Kamyab V.K., Mottaghi M., Kuhn S., KU Leuven, BE

Microfluidics has achieved a positive response in the industrial sector in the last two decades, i.e., due to its minute size plus control over all the chemical and physical properties at various flow rates (Re~1-10) [...]

Development of In-Vivo Screening Benchmarks for Complex Engineered Nanomaterials

Mahoney S., Najera M., Bai Q., Burton E., Veser G., University of Pittsburgh, US

This works investigates embedding metal nanoparticles (NPs) in porous silica shells to reduce or entirely mitigate the metal NPs toxicity while still providing access to the metal NP surface; hence maintaining functionality of the embedded [...]

Influence of molecular weight of PVP on aggregation and thermal diffusivity of silver-based nanofluids

Agresti F., Barison S., Battiston S., Pagura C., Colla L., Fedele L., Fabrizio M., National Research Council of Italy (CNR), IT

With the aim of preparing stable nanofluids for heat exchange applications and to study the effect of surfactant on the aggregation of nanoparticles and thermal diffusivity, stable silver colloids were synthesized in water by a [...]

Synthesis and Surface Activity of Amphiphilic 2-Acylamido-2-Methylpropane Sulfonic Acid – co-N-Isopropyl Acylamide Nanoparticles in Non-Aqueous Media

Atta A., King Saud University, SA

In this work, we synthesized a series of nonionic polymerizable nonyl phenol ethoxylates (NPEs) as organic solvent-soluble surfactants in which straight, branched and cyclic alkyls and phenyl acted as solvophilic segment and polyoxyethylene, or maleate [...]

An investigation on the aggregation phenomena of Titanium dioxide nanoparticles in natural waters: role of ionic strength, organic matter and natural colloidal particles

Romanello M., Luppi V.A., Bertini L., Fidalgo de Cortalezzi M., Instituto Tecnológico de Buenos Aires, AR

The aggregation behavior of TiO2 nanoparticles under conditions normally encountered in natural waters was investigated. Aggregation kinetics and size distribution was determined by DLS using a Nanosizer ZS, Malvern, UK. SEM images were also collected. [...]

Bimodal size distributed silver nanoparticles on copper substrate: in situ heat treating under air and protective atmospheres

Sopousek J., Bursik J., Zalesak J., Pesina Z., Masaryk University, CZ

Ag nano-suspension was prepared by a wet synthetic route. The liquid phase consisted of an organic solvent and the particles had a bimodal distribution with a very narrow size distribution (compare Figure 1). The surface [...]

Modeling Aggregation and Size Distribution of Nanoparticles with Monte Carlo Simulation

Liu H., Surawanvijit S., Rallo R., Orkoulas G., Cohen Y., University of California, Los Angeles, US

The size distribution of the nanoparticles and their aggregates is crucial for predictions of the fate and transport of nanoparticles in the environment. A computational model was developed in the present work based on a [...]

Influence of structural forces and contact hysteresis on flow-induced aggregation and breakage of polymer nanoparticles

Moussa A.S., Ehrl L., Soos M., Lattuada M., Morbidelli M., ETH Zürich, CH

Static light scattering was used on-line to monitor the flow-induced aggregation of surfactant-free polystyrene latexes in a stirred tank. Various latexes with primary particles diameters ranging between 100 and 300 nm, different charge groups, different [...]

Scattering properties of dense clusters of nanoparticles

Lattuada M., Ehrl L., Soos M., Morbidelli M., ETH Zürich, CH

The use of light scattering or laser diffraction techniques to characterize dense clusters such as those generated in shear induced coagulations is highly desirable. However, a major obstacle in the effective utilization of this technique [...]

Synthesis, Encapsulation and Functionization of Composite Organic-Inorganic Nanoparticles with Distinctive Surface Enhanced Raman Signatures

Zhang J., Lu Y., Lutz B., Cao M., Qin H., Yamakawa M., Dentinger C., Nguyen L., Chmura A.J., Zhu J., Lutz B., Sung K-B, Swartz K., Wang L., Su X., Sun L., Sung K-B, Berlin A.A., Chan S., Sun L., Sung K-B, Intel Corporation, US

Composite organic-inorganic nanoparticle (COIN) is a new type of optical label for multiplex biomolecule detection. It has strong Raman signal intensity and potentials for a large number of unique Raman signatures. We have developed methods [...]