Direct Observation of Three-Dimensional Atomic Structure of Twinned Metallic Nanoparticles and Their Catalytic Properties

Nano Letters ◽  
2022 ◽  
Author(s):  
Juhyeok Lee ◽  
Chaehwa Jeong ◽  
Taegu Lee ◽  
Seunghwa Ryu ◽  
Yongsoo Yang
Keyword(s):  
Direct Observation ◽  
Atomic Structure ◽  
Metallic Nanoparticles ◽  
Catalytic Properties ◽  
Three Dimensional

A New 1000kv Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 100-101
Author(s):  
J.L. Williams ◽  
K. Heathcote ◽  
E.J. Greer
Keyword(s):  
Electron Microscope ◽  
Direct Observation ◽  
High Voltage ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Specimen Thickness ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
Dynamic Experiments ◽  
Conventional Instrument

High Voltage Electron Microscope already offers exciting experimental possibilities to Biologists and Materials Scientists because the increased specimen thickness allows direct observation of three dimensional structure and dynamic experiments on effectively bulk specimens. This microscope is designed to give maximum accessibility and space in the specimen region for the special stages which are required. At the same time it provides an ease of operation similar to a conventional instrument.

Three-Dimensional Atomic Structure of Supported Au Nanoparticles at High Temperature

Nanoscale ◽  
2021 ◽  
Author(s):  
Pei Liu ◽  
Ece Arslan Imran ◽  
Annick De Backer ◽  
Annelies de Wael ◽  
Ivan Lobato ◽  
...  
Keyword(s):  
High Temperature ◽  
Atomic Structure ◽  
Au Nanoparticles ◽  
Elevated Temperatures ◽  
Three Dimensional

Au nanoparticles (NPs) deposited on CeO2 are extensively used as thermal catalysts since the morphology of the NPs is expected to be stable at elevated temperatures. Although it is well...

Bifunctional Nanocatalyst Based on Three-Dimensional Carbon Nanotube–Graphene Hydrogel Supported Pd Nanoparticles: One-Pot Synthesis and Its Catalytic Properties

2014 ◽  
Vol 6 (23) ◽  
pp. 21035-21040 ◽  
Author(s):  
Zheye Zhang ◽  
Tai Sun ◽  
Chen Chen ◽  
Fei Xiao ◽  
Zheng Gong ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Catalytic Properties ◽  
Three Dimensional ◽  
Pd Nanoparticles ◽  
One Pot ◽  
One Pot Synthesis ◽  
Supported Pd

scholarly journals Numerical study of the turbulent natural convection of nanofluids in a partially heated cubic cavity

2021 ◽  
pp. 57-57
Author(s):  
Zakaria Lafdaili ◽  
Sakina El-Hamdani ◽  
Abdelaziz Bendou ◽  
Karim Limam ◽  
Bara El-Hafad
Keyword(s):  
Nusselt Number ◽  
Natural Convection ◽  
Heat Exchange ◽  
Metallic Nanoparticles ◽  
Volume Fraction ◽  
Numerical Study ◽  
Three Dimensional ◽  
Stability Characteristic ◽  
Horizontal Strip ◽  
Turbulent Natural Convection

In this work we study numerically the three-dimensional turbulent natural convection in a partially heated cubic cavity filled with water containing metallic nanoparticles, metallic oxides and others based on carbon.The objective is to study and compare the effect of the addition of nanoparticles studied in water and also the effect of the position of the heated partition on the heat exchange by turbulent natural convection in this type of geometry, which can significantly improve the design of heat exchange systems for better space optimization. For this we have treated numerically for different volume fractions the turbulent natural convection in the two cases where the cavity is heated respectively by a vertical and horizontal strip in the middle of one of the vertical walls. To take into account the effects of turbulence, we used the standard turbulence model ? - ?. The governing equations are discretized by the finite volume method using the power law scheme which offers a good stability characteristic in this type of flow. The results are presented in the form of isothermal lines and current lines. The variation of the mean Nusselt number is calculated for the two positions of the heated partition as a function of the volume fraction of the nanoparticles studied in water for different Rayleigh numbers.The results show that carbon-based nanoparticles intensify heat exchange by convection better and that the position of the heated partition significantly influences heat exchange by natural convection. In fact, an improvement in the average Nusselt number of more than 20% is observed for the case where the heated partition is horizontal.

Dendrimer applications: a brief review

2021 ◽  
Vol 25 ◽  
Author(s):  
Luis Daniel Pedro-Hernández ◽  
Marcos Martínez-García
Keyword(s):  
Tissue Repair ◽  
Laser Emission ◽  
Catalytic Properties ◽  
Gene Transfection ◽  
Three Dimensional ◽  
Drug Carriers ◽  
The Core ◽  
Controlled Structure ◽  
Dendritic Branches ◽  
Metallic Species

: Dendrimers are highly branched three-dimensional macromolecules with a highly controlled structure, a single molecular weight, numerous controllable dendritic branches and peripheral functionalities, as well as the tendency to adopt an ellipsoid or spheroid shape once a certain size is reached. These features have made them attractive for application in pharmaceutical and medicinal chemistry in gene transfection, as medical imaging agents, and as drug carriers in potential drug delivery agents. The incorporation of metallic species into dendritic molecules has also been reported; the focus has been on organometallic dendrimers with metallic species only at specific positions of the molecules, such as the core, dendritic branches and the periphery, studied for their magnetic, electronic, and photo-optical or catalytic properties. Dendrimers have been investigated for optoelectronic applications (adsorption, emission, laser emission, nonlinear optics) through the encapsulation of active units by dendritic branches, core and peripheral. This review briefly discusses their use in nanomedicine, cancer treatment, treatment of other diseases, tissue repair, catalysis and applications in OLEDs and solar cells.

Low-temperature oxidation of carbon monoxide over Bi-metallic nanoparticles incorporated three dimensional silica

2021 ◽  
Vol 244 ◽  
pp. 117955
Author(s):  
Mohamed S. Hamdy ◽  
Badria M. Al-Shehri ◽  
Murad Eissa ◽  
Fahad A. Alharthi ◽  
Abdulaziz Ali Alghamdi ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Low Temperature ◽  
Metallic Nanoparticles ◽  
Three Dimensional ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Oxidation Of Carbon Monoxide

scholarly journals Three-Dimensional Atomic Force Microscopy: Interaction Force Vector by Direct Observation of Tip Trajectory

2014 ◽  
Vol 106 (2) ◽  
pp. 797a
Author(s):  
Krishna P. Sigdel ◽  
Justin S. Grayer ◽  
Gavin M. King
Keyword(s):  
Atomic Force Microscopy ◽  
Direct Observation ◽  
Three Dimensional ◽  
Interaction Force ◽  
Force Vector ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals Visualising the Three-dimensional Morphology and Surface Structure of Metallic Nanoparticles at Atomic Resolution by Automated HAADF STEM Atom Counting

2014 ◽  
Vol 20 (S3) ◽  
pp. 60-61
Author(s):  
Lewys Jones ◽  
Vidar T. Fauske ◽  
Katherine E. MacArthur ◽  
Antonius T. J. van Helvoort ◽  
Peter D. Nellist
Keyword(s):  
Surface Structure ◽  
Metallic Nanoparticles ◽  
Three Dimensional ◽  
Atomic Resolution ◽  
Atom Counting

Direct observation of the atomic structure of W {100} surfaces

1979 ◽  
Vol 30 (12) ◽  
pp. 767-770 ◽  
Author(s):  
T.T. Tsong ◽  
John Sweeney
Keyword(s):  
Direct Observation ◽  
Atomic Structure
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