Deposition of levitated charged nanoparticles on a substrate using an electrostatic lens

2018 ◽  
Author(s):  
Ian McAdams ◽  
Jacob Murphy ◽  
Bruce Kane ◽  
Jose Hannan ◽  
Samuel Kleuter ◽  
...  
Keyword(s):  
Electrostatic Lens ◽  
Charged Nanoparticles

Development of a conical anode Fe-gun for low voltage SEM

1988 ◽  
Vol 46 ◽  
pp. 978-979
Author(s):  
T. Miyokawa ◽  
S. Norioka ◽  
S. Goto
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Low Voltage ◽  
Irradiation Damage ◽  
Cold Cathode ◽  
Virtual Source ◽  
Source Position ◽  
Electrostatic Lens ◽  
Electrostatic Lenses ◽  
Wide Range

Field emission SEMs (FE-SEMs) are becoming popular due to their high resolution needs. In the field of semiconductor product, it is demanded to use the low accelerating voltage FE-SEM to avoid the electron irradiation damage and the electron charging up on samples. However the accelerating voltage of usual SEM with FE-gun is limited until 1 kV, which is not enough small for the present demands, because the virtual source goes far from the tip in lower accelerating voltages. This virtual source position depends on the shape of the electrostatic lens. So, we investigated several types of electrostatic lenses to be applicable to the lower accelerating voltage. In the result, it is found a field emission gun with a conical anode is effectively applied for a wide range of low accelerating voltages.A field emission gun usually consists of a field emission tip (cold cathode) and the Butler type electrostatic lens.

scholarly journals A compact electrostatic lens for velocity map imaging experiments

2021 ◽  
pp. e1910357
Author(s):  
E. Sakkoula ◽  
B. G. M. van Oorschot ◽  
D. H. Parker
Keyword(s):  
Velocity Map Imaging ◽  
Electrostatic Lens

Penetration and preferential binding of charged nanoparticles to mixed lipid monolayers: interplay of lipid packing and charge density

Soft Matter ◽  
2020 ◽  
Author(s):  
Anurag Chaudhury ◽  
Koushik Debnath ◽  
Wei Bu ◽  
Nikhil R. Jana ◽  
Jaydeep Kumar Basu
Keyword(s):  
Charge Density ◽  
Biomedical Applications ◽  
Cell Membranes ◽  
Lipid Monolayers ◽  
Cytotoxic Effects ◽  
Lipid Packing ◽  
Preferential Binding ◽  
Charged Nanoparticles

Designing of nanoparticles (NPs) for biomedical applications or mitigating their cytotoxic effects require microscopic understanding of their interactions with cell membranes. Such insight is best obtained by studying model biomembranes...

Theory of non-equilibrium critical phenomena in three-dimensional condensed systems of charged mobile nanoparticles

2014 ◽  
Vol 16 (27) ◽  
pp. 13974-13983 ◽  
Author(s):  
V. N. Kuzovkov ◽  
G. Zvejnieks ◽  
E. A. Kotomin
Keyword(s):  
Critical Phenomena ◽  
3D Structure ◽  
Three Dimensional ◽  
Charged Nanoparticles ◽  
Self Assembled ◽  
Oppositely Charged ◽  
Condensed Systems ◽  
Non Equilibrium

The 3d structure of self-assembled and oppositely charged nanoparticles.

Regulation of Interparticle Forces Reveals Controlled Aggregation in Charged Nanoparticles

2016 ◽  
Vol 28 (7) ◽  
pp. 2348-2355 ◽  
Author(s):  
Anish Rao ◽  
Soumendu Roy ◽  
Mahima Unnikrishnan ◽  
Sumit S. Bhosale ◽  
Gayathri Devatha ◽  
...  
Keyword(s):  
Interparticle Forces ◽  
Charged Nanoparticles

scholarly journals From molecular clusters to nanoparticles: second-generation ion-mediated nucleation model

2006 ◽  
Vol 6 (12) ◽  
pp. 5193-5211 ◽  
Author(s):  
F. Yu
Keyword(s):  
Atmospheric Aerosols ◽  
Second Generation ◽  
Cloud Condensation Nuclei ◽  
Size Composition ◽  
Galactic Cosmic Rays ◽  
Lower Atmosphere ◽  
Uncertainty Range ◽  
Charged Clusters ◽  
Charged Nanoparticles ◽  
Ion Mobility Spectra

Abstract. Ions, which are generated in the atmosphere by galactic cosmic rays and other ionization sources, may play an important role in the formation of atmospheric aerosols. In the paper, a new second-generation ion-mediated nucleation (IMN) model is presented. The new model explicitly treats the evaporation of neutral and charged clusters and it describes the evolution of the size spectra and composition of both charged and neutral clusters/particles ranging from small clusters of few molecules to large particles of several micrometers in diameter. Schemes used to calculate the evaporation coefficients for small neutral and charged clusters are consistent with the experimental data within the uncertainty range. The present IMN model, which is size-, composition-, and type-resolved, is a powerful tool for investigating the dominant mechanisms and key parameters controlling the formation and subsequent growth of nanoparticles in the atmosphere. This model can be used to analyze simultaneous measurements of the ion-mobility spectra and particle size distributions, which became available only recently. General features of the spectra for ions smaller than the critical size, size-dependent fractions of charged nanoparticles, and asymmetrical charging of freshly nucleated particles predicted by the new IMN model are consistent with recent measurements. Results obtained using the second generation IMN model, in which the most recent thermodynamic data for neutral and charged H2SO4-H2O clusters were used, suggest that ion-mediated nucleation of H2SO4-H2O can lead to a significant production of new particles in the lower atmosphere (including the boundary layer) under favorable conditions. It has been shown that freshly nucleated particles of few nanometers in size can grow by the condensation of low volatile organic compounds to the size of cloud condensation nuclei. In such cases, the chemical composition of nucleated particles larger than ~10 nm is dominated by organics.

scholarly journals Electrolyte-Mediated Assembly of Charged Nanoparticles

2016 ◽  
Vol 2 (4) ◽  
pp. 219-224 ◽  
Author(s):  
Sumit Kewalramani ◽  
Guillermo I. Guerrero-García ◽  
Liane M. Moreau ◽  
Jos W. Zwanikken ◽  
Chad A. Mirkin ◽  
...  
Keyword(s):  
Charged Nanoparticles

Where in the world are condensed counterions?

Soft Matter ◽  
2022 ◽  
Author(s):  
Qishun Tang ◽  
Michael Rubinstein
Keyword(s):  
Concentration Profiles ◽  
Scaling Model ◽  
The World ◽  
Charged Nanoparticles ◽  
Nanoparticle Sizes

A scaling model of the concentration profiles of both condensed and free counterions is presented for solutions of spherical and cylindrical charged nanoparticles of different charge valences, nanoparticle sizes, and...

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