◾ Buoyancy-Driven Convection of Enclosed Nanoparticle Suspensions

2015 ◽  
pp. 301-338 ◽  
Keyword(s):  
Nanoparticle Suspensions ◽  
Buoyancy Driven Convection

Interference of Gold Nanoparticles with In vitro Endotoxin Detection Assays

2020 ◽  
Vol 16 (2) ◽  
pp. 204-213 ◽  
Author(s):  
Melissa A. Vetten ◽  
Mary Gulumian
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Surface Reactivity ◽  
In Vitro Assays ◽  
Limulus Amebocyte Lysate ◽  
Chromogenic Assay ◽  
Nanoparticle Suspensions ◽  
Endotoxin Contamination ◽  
Factor C

Background: Endotoxin-free engineered nanoparticle suspensions are imperative for their successful applications in the field of nanomedicine as well as in the investigations in their toxicity. Gold nanoparticles are known to interfere with various in vitro assays due to their optical properties and potential for surface reactivity. In vitro endotoxin testing assays are known to be susceptible to interference caused by the sample being tested. Objective: This study aimed to identify a preferred assay for the testing of endotoxin contamination in gold nanoparticle suspensions. Methods: The interference by gold nanoparticles on three assays namely, the commonly used limulus amebocyte lysate chromogenic assay, the limulus amebocyte lysate gel-clot method, and the less common recombinant Factor C (rFC) assay, was tested. Results: Possible interference could be observed with all three assays. The interference with the absorbance- based chromogenic assay could not be overcome by dilution; whilst the qualitative nature of the gel-clot assay excluded the possibility of distinguishing between a false positive result due to enhancement of the sensitivity of the assay, and genuine endotoxin contamination. However, interference with the rFC assay was easily overcome through dilution. Conclusion: The rFC assay is recommended as an option for endotoxin contamination detection in gold nanoparticle suspensions.

scholarly journals Untangling superposed double layer and structural forces across confined nanoparticle suspensions

2021 ◽  
Author(s):  
Michael Ludwig ◽  
Regine von Klitzing
Keyword(s):  
Double Layer ◽  
Interaction Force ◽  
Charged Surfaces ◽  
Structural Forces ◽  
Nanoparticle Suspensions ◽  
Confined Suspensions ◽  
Force Profiles

Complete interaction force profiles of charged surfaces across confined suspensions were successfully described using a superposition of double layer and structural forces.

Buoyancy-driven convection of droplets on hot nonwetting surfaces

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
E. Yim ◽  
A. Bouillant ◽  
F. Gallaire
Keyword(s):  
Buoyancy Driven Convection

scholarly journals A multi-site, year-round turbulence microstructure atlas for the deep perialpine Lake Garda

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Sebastiano Piccolroaz ◽  
Bieito Fernández-Castro ◽  
Marco Toffolon ◽  
Henk A. Dijkstra
Keyword(s):  
Turbulent Mixing ◽  
Meteorological Data ◽  
Time Of Day ◽  
Monthly Basis ◽  
Lake Garda ◽  
Standardized Protocol ◽  
Wide Range ◽  
Buoyancy Driven Convection ◽  
Monitoring Activity ◽  
Additional Monitoring

AbstractA multi-site, year-round dataset comprising a total of 606 high-resolution turbulence microstructure profiles of shear and temperature gradient in the upper 100 m depth is made available for Lake Garda (Italy). Concurrent meteorological data were measured from the fieldwork boat at the location of the turbulence measurements. During the fieldwork campaign (March 2017-June 2018), four different sites were sampled on a monthly basis, following a standardized protocol in terms of time-of-day and locations of the measurements. Additional monitoring activity included a 24-h campaign and sampling at other sites. Turbulence quantities were estimated, quality-checked, and merged with water quality and meteorological data to produce a unique turbulence atlas for a lake. The dataset is open to a wide range of possible applications, including research on the variability of turbulent mixing across seasons and sites (demersal vs pelagic zones) and driven by different factors (lake-valley breezes vs buoyancy-driven convection), validation of hydrodynamic lake models, as well as technical studies on the use of shear and temperature microstructure sensors.

scholarly journals Light Confinement with Structured Beams in Gold Nanoparticle Suspensions

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 221
Author(s):  
Argelia Balbuena Balbuena Ortega ◽  
Felix E. Torres-González ◽  
Valentin López López Gayou ◽  
Raul Delgado Delgado Macuil ◽  
Gaetano Assanto ◽  
...  
Keyword(s):  
Colloidal Suspension ◽  
Laser Wavelength ◽  
Gaussian Beams ◽  
Optical Vortices ◽  
Complex Structures ◽  
Plasmonic Resonance ◽  
Dark Solitons ◽  
Experimental Campaign ◽  
Nanoparticle Suspensions ◽  
Light Beams

We carry out an experimental campaign to investigate the nonlinear self-defocusing propagation of singular light beams with various complex structures of phase and intensity in a colloidal suspension of gold nanoparticles with a plasmonic resonance near the laser wavelength (532nm). Studying optical vortices embedded in Gaussian beams, Bessel vortices and Bessel-cosine (necklace) beams, we gather evidence that while intense vortices turn into two-dimensional dark solitons, all structured wavepackets are able to guide a weak Gaussian probe of different wavelength (632.8 nm) along the dark core. The probe confinement also depends on the topological charge of the singular pump.

Storage Wars: how citrate-capped silver nanoparticle suspensions are affected by not-so-trivial decisions

2014 ◽  
Vol 16 (4) ◽  
Author(s):  
Justin M. Gorham ◽  
Anne B. Rohlfing ◽  
Katrice A. Lippa ◽  
Robert I. MacCuspie ◽  
Amy Hemmati ◽  
...  
Keyword(s):  
Silver Nanoparticle ◽  
Nanoparticle Suspensions

Development and assessment of nanoparticle suspensions as fundament for toxicological analysis

2009 ◽  
Vol 189 ◽  
pp. S185
Author(s):  
Tobias Meißner ◽  
Annegret Potthoff ◽  
Volkmar Richter
Keyword(s):  
Toxicological Analysis ◽  
Nanoparticle Suspensions

The Influence of Gravity on Eutectic PbSn Alloy Grown by the Vertical Bridgman Method

2016 ◽  
Vol 869 ◽  
pp. 637-642
Author(s):  
Rafael Cardoso Toledo ◽  
Chen Y. An ◽  
Irajá Newton Bandeira ◽  
Filipe Estevão de Freitas
Keyword(s):  
Eutectic Alloy ◽  
Thermal Gradient ◽  
Bridgman Method ◽  
Vertical Bridgman Method ◽  
Vertical Bridgman ◽  
Composition Profiles ◽  
Buoyancy Driven Convection ◽  
Gravity Acceleration

Composition profiles of eutectic alloy Pb25.9Sn74.1 atomic % grown by the normal and inverted Bridgman methods are presented and the study of the solute alloy redistribution is made. The inverted vertical Bridgman method, where the solidification occurs from the top to the bottom of the melt under a destabilizing thermal gradient, allows the growth of crystals with buoyancy-driven convection different from that with the usual vertical Bridgman configuration. The scope of this work is to study the influence of the gravity acceleration in the convection process.

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