Nanoparticle Aggregation and Fractal Growth in Fluid Smectic Membranes

Meienberg, Kyle; Malinina, T.; Nguyen, Zoom; Park, C. S.; Glaser, Matthew A.; Clark, Noel A.; Maclennan, Joseph E.

doi:10.1080/15421406.2015.1027990

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…These results indicate the long response time of the His@AuNPs for streptomycin with a likely rapid detection platform. The absorbance intensity (660 nm) increases exponentially up to 10 to 15 min and stabilizes within 20 to 25 min, indicating fractal growth of His@AuNP aggregates, and results found in agreement with a previous report [85].…”

Section: Effect Of Ionic Strength and Real-time Responsesupporting

confidence: 93%

Histidine Functionalized Gold Nanoparticles for Screening Aminoglycosides and Nanomolar Level Detection of Streptomycin in Water, Milk, and Whey

et al. 2021

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Aminoglycoside (AMG) antibiotics are being applied to treat infections caused by Gram-negative bacteria, mainly in livestock, and are prescribed only in severe cases because of their adverse impacts on human health and the environment. Monitoring antibiotic residues in dairy products relies on the accessibility of portable and efficient analytical techniques. Presently, high-throughput screening techniques have been proposed to detect several antimicrobial drugs having identical structural and functional features. The L-histidine functionalized gold nanoparticles (His@AuNPs) do not form a complex with other tested antibiotic classes but show high selectivity for AMG antibiotics. We used ligand-induced aggregation of His@AuNPs as a rapid and sensitive localized surface plasmon resonance (LSPR) assay for AMG antibiotics, producing longitudinal extinction shifts at 660 nm. Herein, we explore the practical application of His@AuNPs to detect streptomycin spiked in water, milk, and whey fraction of milk with nanomolar level sensitivity. The ability of the analytical method to recognize target analytes sensitively and rapidly is of great significance to perform monitoring, thus would certainly reassure widespread use of AMG antibiotics. The biosynthesis of hybrid organic–inorganic metal nanoparticles like His@AuNPs with desired size distribution, stability, and specific host–guest recognition proficiency, would further facilitate applications in various other fields.

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Section: Effect Of Ionic Strength and Real-time Responsesupporting

confidence: 93%

Histidine Functionalized Gold Nanoparticles for Screening Aminoglycosides and Nanomolar Level Detection of Streptomycin in Water, Milk, and Whey

et al. 2021

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“…Flow under the influence of external electric and magnetic fields [27,28,29,30,31,32,33], mechanical torques [34], and thermal gradients [35,36] have also been studied. Thin smectic films have also enabled the investigation of hydrodynamic instabilities [37,38,39], particle aggregation [40,41,42] and quasi-2D emulsions [42,43,44,45,46,47,48].…”

Section: Fundamental Research On Thin Smectic Filmsmentioning

confidence: 99%

Realization of hydrodynamic experiments on quasi-2D liquid crystal films in microgravity

Clark

Eremin

Glaser

et al. 2017

Advances in Space Research

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Freely suspended films of smectic liquid crystals are unique examples of quasi two-dimensional fluids. Mechanically stable and with quantized thickness of the order of only a few molecular layers, smectic films are ideal systems for studying fundamental fluid physics, such as collective molecular ordering, defect and fluctuation phenomena, hydrodynamics, and nonequilibrium behavior in two dimensions (2D), including serving as models of complex biological membranes. Smectic films can be drawn across openings in planar supports resulting in thin, meniscus-bounded membranes, and can also be prepared as bubbles, either supported on an inflation tube or floating freely. The quantized layering renders smectic films uniquely useful in 2D fluid physics. The OASIS team has pursued a variety of ground-based and microgravity applications of thin liquid crystal films to fluid structure and hydrodynamic problems in 2D and quasi-2D systems. Parabolic flights and sounding rocket experiments were carried out in order to explore the shape evolution of free floating smectic bubbles, and to probe Marangoni effects in flat films. The dynamics of emulsions of smectic islands (thicker regions on thin background films) and of microdroplet inclusions in spherical films, as well as thermocapillary effects, were studied over extended periods within the OASIS (Observation and Analysis of Smectic Islands in Space) project on the International Space Station. We summarize the technical details of the OASIS hardware and give preliminary examples of key observations.

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“…On the other hand, when this slurry is agitated at 50 rpm for 3 h (Figure 2c,d), the AB particles are restructured to form spherical agglomerates of tens of micrometers, which is larger than the active material. The fractal dimensions were obtained by using the software Image J based on the box-counting method, and the fractal dimensions of NMC−AB branched agglomerates and AB spherical agglomerates are calculated as 1.57(±0.03) (value expected in diffusion-limited aggregation in 2D) 21 and 1.75(±0.02), respectively. Through the fractal dimension analysis, a clear difference between the two structures can be confirmed quantitatively.…”

Section: Resultsmentioning

confidence: 99%

Significant Agglomeration of Conductive Materials and the Dispersion State Change of the Ni-Rich NMC-Based Cathode Slurry during Storage

Park

Sung

Kim³

et al. 2022

Ind. Eng. Chem. Res.

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The dispersion quality and the storage stability of the electrode slurry are very important industrial issues as they directly affect the productivity of the electrode process as well as the performance of the battery. To maintain the dispersion stability, the prepared electrode slurry is agitated in a storage tank before entering the subsequent coating process. However, our understanding on the dispersibility of electrode slurries during storage is not enough. In this study, we systematically investigate the changes in the dispersion state and the rheological properties of Ni-rich NMC-based cathode slurries under various agitating conditions during storage. Most of the conductive nanoparticles form large spherical agglomerates of several tens of micrometers under low-speed agitating conditions, resulting in a dramatic change in the rheological properties. We also report that the change in the dispersion state and the rheological properties during storage can be characterized by the hydrodynamic stress induced by the flow. The mechanism of change in the microstructure of the cathode slurry during storage can be understood by considering the relative affinity between the particles and the flow characteristics during agitation. This study clearly demonstrates how the cathode slurry should be cared during storage to prevent quality problems.

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Nanoparticle Aggregation and Fractal Growth in Fluid Smectic Membranes

Cited by 8 publications

References 34 publications

Histidine Functionalized Gold Nanoparticles for Screening Aminoglycosides and Nanomolar Level Detection of Streptomycin in Water, Milk, and Whey

Histidine Functionalized Gold Nanoparticles for Screening Aminoglycosides and Nanomolar Level Detection of Streptomycin in Water, Milk, and Whey

Realization of hydrodynamic experiments on quasi-2D liquid crystal films in microgravity

Significant Agglomeration of Conductive Materials and the Dispersion State Change of the Ni-Rich NMC-Based Cathode Slurry during Storage

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