A viable method to enhance the electrical conductivity of CNT bundles: direct in situ TEM evaluation

Nanoscale ◽  
2020 ◽  
Vol 12 (24) ◽  
pp. 13095-13102
Author(s):  
Xiaojing Gong ◽  
Hui Zhang ◽  
Zhehao Sun ◽  
Xiaoliang Zhang ◽  
Jing Xu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Joule Heating ◽  
In Situ Tem ◽  
Theoretical Estimation ◽  
Microscopic Scale ◽  
The Relationship ◽  
Viable Method

We report in situ TEM observations and theoretical estimation of the relationship between Joule-heating induced temperature, electrical conductivity and the amount of nanowelding in pristine CNT assemblies at the microscopic scale.

scholarly journals In-situ reduction by Joule heating and measurement of electrical conductivity of graphene oxide in a transmission electron microscope

2D Materials ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 031001
Author(s):  
Simon Hettler ◽  
David Sebastian ◽  
Mario Pelaez-Fernandez ◽  
Ana M Benito ◽  
Wolfgang K Maser ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Joule Heating ◽  
In Situ Reduction ◽  
Transmission Electron

In situ TEM study of lithiation into a PPy coated α-MnO2/graphene foam freestanding electrode

2018 ◽  
Vol 2 (8) ◽  
pp. 1481-1488 ◽  
Author(s):  
Mohammad Akbari Garakani ◽  
Sara Abouali ◽  
Jiang Cui ◽  
Jang-Kyo Kim
Keyword(s):  
Electrical Conductivity ◽  
Lithium Ion Batteries ◽  
Large Volume ◽  
Volume Expansion ◽  
Low Cost ◽  
Lithium Ion ◽  
In Situ Tem ◽  
The Many ◽  
Charge Discharge

Even with the many desirable properties, natural abundance and low cost of α-MnO2, its application as an anode in lithium-ion batteries has been limited because of its low intrinsic electrical conductivity and large volume expansion occurring during charge/discharge cycles.

Electrical Conductivity, Chemistry, and Bonding Alternations under Graphene Oxide to Graphene Transition As Revealed by In Situ TEM

ACS Nano ◽  
2011 ◽  
Vol 5 (6) ◽  
pp. 4401-4406 ◽  
Author(s):  
Zhi Xu ◽  
Yoshio Bando ◽  
Lei Liu ◽  
Wenlong Wang ◽  
Xuedong Bai ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
In Situ Tem

THEORETICAL ESTIMATION OF IN-SITU STRESSED STATE OF ROCK MASSIFES UNDER CONDITIONS OF

2019 ◽  
Vol 4 (1) ◽  
pp. 292-304
Author(s):  
I.L. Pankov ◽  
Keyword(s):  
Stress Distribution ◽  
Stress Field ◽  
Stressed State ◽  
Deformation Modulus ◽  
Horizontal Stress ◽  
Tectonic Stress ◽  
Theoretical Estimation ◽  
Vertical Pressure ◽  
The Relationship

System of physical equations was obtained, which determines the relationship between main stresses and corresponding strains for the conditions of the all-round compression tectonic stress field in a virgin compacted intact massif of rocks. Estimated formulas for determining the maximum and minimum horizontal stresses of an intact massif, which is under conditions of plane-directional tectonic influence depending on the factors of vertical pressure, porosity and deformation modulus of rocks, are obtained. The behavior of the horizontal stress distribution from the vertical pressure is considered under the influence of various factors.

scholarly journals Experimental study on the electrical conductivity of quartz andesite at high temperature and high pressure: evidence of grain boundary transport

Solid Earth ◽  
2015 ◽  
Vol 6 (3) ◽  
pp. 1037-1043 ◽  
Author(s):  
K. S. Hui ◽  
H. Zhang ◽  
H. P. Li ◽  
L. D. Dai ◽  
H. Y. Hu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Grain Boundary ◽  
Conduction Mechanism ◽  
Small Polaron ◽  
Boundary Conductivity ◽  
Boundary Process ◽  
The Relationship ◽  
Grain Boundary Transport ◽  
Ion Conduction Mechanism

Abstract. In this study, the electrical conductivity of quartz andesite was measured in situ under conditions of 0.5–2.0 GPa and 723–973 K using a YJ-3000t multi-anvil press and a Solartron-1260 Impedance/Gain-Phase Analyzer. Experimental results indicate that grain interior transport controls the higher frequencies (102–106 Hz), whereas the grain boundary process dominates the lower frequencies (10−1–102 Hz). For a given pressure and temperature range, the relationship between Log σ and T−1 follows the Arrhenius relation. As temperature increased, both the grain boundary and grain interior conductivities of quartz andesite increased; however, with increasing pressure, both the grain boundary and grain interior conductivities of the sample decreased. By the virtue of the dependence of grain boundary conductivity on pressure, the activation enthalpy and the activation volume were calculated to be 0.87–0.92 eV and 0.56 ± 0.52 cm3 mol−1, respectively. The small polaron conduction mechanism for grain interior process and the ion conduction mechanism for grain boundary process are also discussed.

In-situ TEM study of the dynamic behavior of the graphene-metal interface evolution under Joule heating

2016 ◽  
Vol 59 (7) ◽  
pp. 1080-1084 ◽  
Author(s):  
JiaKe Wei ◽  
Zhi Xu ◽  
Hao Wang ◽  
WenLong Wang ◽  
XueDong Bai
Keyword(s):  
Dynamic Behavior ◽  
Joule Heating ◽  
In Situ Tem ◽  
Metal Interface ◽  
Interface Evolution

In situ TEM studies of irradiation effects for materials improvement

1991 ◽  
Vol 49 ◽  
pp. 452-453
Author(s):  
Charles W. Allen
Keyword(s):  
Nuclear Reactor ◽  
Austenitic Stainless Steels ◽  
High Energy ◽  
Point Of View ◽  
In Situ Tem ◽  
Irradiation Effects ◽  
Tem Analysis ◽  
Radiation Induced ◽  
Analytical Tools

Irradiation effects studies employing TEMs as analytical tools have been conducted for almost as many years as materials people have done TEM, motivated largely by materials needs for nuclear reactor development. Such studies have focussed on the behavior both of nuclear fuels and of materials for other reactor components which are subjected to radiation-induced degradation. Especially in the 1950s and 60s, post-irradiation TEM analysis may have been coupled to in situ (in reactor or in pile) experiments (e.g., irradiation-induced creep experiments of austenitic stainless steels). Although necessary from a technological point of view, such experiments are difficult to instrument (measure strain dynamically, e.g.) and control (temperature, e.g.) and require months or even years to perform in a nuclear reactor or in a spallation neutron source. Consequently, methods were sought for simulation of neutroninduced radiation damage of materials, the simulations employing other forms of radiation; in the case of metals and alloys, high energy electrons and high energy ions.

Profile Imaging of Silicon Surface Reconstructions

1985 ◽  
Vol 43 ◽  
pp. 262-263
Author(s):  
O.L. Krivanek ◽  
G.J. Wood
Keyword(s):  
Electron Microscopy ◽  
Surface Structure ◽  
Structure Determination ◽  
Silicon Surface ◽  
Good Resolution ◽  
Surface Reconstructions ◽  
Bulk Structure ◽  
Point To Point ◽  
The Relationship

Electron microscopy at 0.2nm point-to-point resolution, 10-10 torr specimei region vacuum and facilities for in-situ specimen cleaning presents intere; ing possibilities for surface structure determination. Three methods for examining the surfaces are available: reflection (REM), transmission (TEM) and profile imaging. Profile imaging is particularly useful because it giv good resolution perpendicular as well as parallel to the surface, and can therefore be used to determine the relationship between the surface and the bulk structure.

Sign in / Sign up

Export Citation Format

Share Document