scholarly journals Tungsten Nanoparticles Produced by Magnetron Sputtering Gas Aggregation: Process Characterization and Particle Properties

2020 ◽  
Author(s):  
Tomy Acsente ◽  
Lavinia Gabriela Carpen ◽  
Elena Matei ◽  
Bogdan Bita ◽  
Raluca Negrea ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Aggregation Process ◽  
Particle Properties ◽  
Process Characterization ◽  
Tungsten Nanoparticles

Process characterization with d.c. magnetron sputtering of CrSiC thin films in ArCH4 mixtures

1991 ◽  
Vol 201 (1) ◽  
pp. 109-122 ◽  
Author(s):  
Gerhard Sobe ◽  
Antje Neelmeijer ◽  
Günter Weise ◽  
Armin Heinrich
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Process Characterization

scholarly journals The Spectral Ice Habit Prediction System (SHIPS). Part IV: Box Model Simulations of the Habit-Dependent Aggregation Process

2011 ◽  
Vol 68 (6) ◽  
pp. 1142-1161 ◽  
Author(s):  
Tempei Hashino ◽  
Gregory J. Tripoli
Keyword(s):  
Particle Size ◽  
Simple Model ◽  
Terminal Velocity ◽  
Crystal Habit ◽  
Size Distributions ◽  
Prediction System ◽  
Aggregation Process ◽  
Particle Size Distributions ◽  
Particle Properties ◽  
Aggregation Processes

Abstract The purpose of this paper is to assess the prediction of particle properties of aggregates and particle size distributions with the Spectral Ice Habit Prediction System (SHIPS) and to investigate the effects of crystal habits on aggregation process. Aggregation processes of ice particles are critical to the understanding of precipitation and the radiative signatures of cloud systems. Conventional approaches taken in cloud-resolving models (CRMs) are not ideal to study the effects of crystal habits on aggregation processes because the properties of aggregates have to be assumed beforehand. As described in Part III, SHIPS solves the stochastic collection equation along with particle property variables that contain information about crystal habits and maximum dimensions of aggregates. This approach makes it possible to simulate properties of aggregates explicitly and continuously in CRMs according to the crystal habits. The aggregation simulations were implemented in a simple model setup, assuming seven crystal habits and several initial particle size distributions (PSDs). The predicted PSDs showed good agreement with observations after rescaling except for the large-size end. The ice particle properties predicted by the model, such as the mass–dimensional (m-D) relationship and the relationship between diameter of aggregates and number of component crystals in an aggregate, were found to be quantitatively similar to those observed. Furthermore, these predictions were dependent on the initial PSDs and habits. A simple model for the growth of a particle’s maximum dimension was able to simulate the typically observed fractal dimension of aggregates when an observed value of the separation ratio of two particles was used. A detailed analysis of the collection kernel indicates that the m-D relationship unique to each crystal habit has a large impact on the growth rate of aggregates through the cross-sectional area or terminal velocity difference, depending on the initial equivalent particle distribution. A significant decrease in terminal velocity differences was found in the inertial flow regime for all the habits but the constant-density sphere. It led to formation of a local maximum in the collection kernel and, in turn, formed an identifiable mode in the PSDs. Remaining issues that must be addressed in order to improve the aggregation simulation with the quasi-stochastic model are discussed.

Synthesis of flower-like tungsten nanoparticles by magnetron sputtering combined with gas aggregation

2015 ◽  
Vol 69 (6) ◽  
Author(s):  
Tomy Acsente ◽  
Raluca Florentina Negrea ◽  
Leona Cristina Nistor ◽  
Constantin Logofatu ◽  
Elena Matei ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Tungsten Nanoparticles

Tungsten nanoparticles with controlled shape and crystallinity obtained by magnetron sputtering and gas aggregation

2017 ◽  
Vol 200 ◽  
pp. 121-124 ◽  
Author(s):  
T. Acsente ◽  
R.F. Negrea ◽  
L.C. Nistor ◽  
E. Matei ◽  
C. Grisolia ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Tungsten Nanoparticles

A Sensitive On-Grid Immunoelectron Microscopic Procedure for Diagnosis of Rotavirus Infection

1980 ◽  
Vol 38 ◽  
pp. 506-507
Author(s):  
M. F. Miller ◽  
A. R. Rubenstein
Keyword(s):  
Electron Microscopy ◽  
Specific Antibody ◽  
Immune Complexes ◽  
Acute Gastroenteritis ◽  
Plant Viruses ◽  
Aggregation Process ◽  
Microscopic Technique ◽  
Fecal Material ◽  
Present Communication ◽  
Number Of Particles

Studies of rotavirus particles in humans, monkeys and various non-primates with acute gastroenteritis have involved detection of virus in fecal material by electron microscopy. The EM techniques most commonly employed have been the conventional negative staining (Fig. 1) and immune aggregation (Fig. 2) procedures. Both methods are somewhat insensitive and can most reliably be applied to samples containing large quantities of virus either naturaLly or as a result of concentration by ultracentrifugation. The formation of immune complexes by specific antibody in the immune aggregation procedures confirms the rotavirus diagnosis, but the number of particles per given microscope field is effectively reduced by the aggregation process. In the present communication, we describe use of an on-grid immunoelectron microscopic technique in which rotavirus particles are mounted onto microscope grids that were pre-coated with specific antibody. The technique is a modification of a method originalLy introduced by Derrick (1) for studies of plant viruses.

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