Advantage of the scanning tunnelling microscope in documenting changes in carbon fibre surface morphology brought about by various surface treatments

1991 ◽  
Vol 26 (17) ◽  
pp. 4545-4553 ◽  
Author(s):  
W. P. Hoffman ◽  
W. C. Hurley ◽  
T. W. Owens ◽  
H. T. Phan
Keyword(s):  
Surface Morphology ◽  
Carbon Fibre ◽  
Fibre Surface ◽  
Surface Treatments ◽  
Scanning Tunnelling Microscope ◽  
Scanning Tunnelling

Comparison of short carbon fibre surface treatments on epoxy composites

2004 ◽  
Vol 64 (13-14) ◽  
pp. 2021-2029 ◽  
Author(s):  
Hui Zhang ◽  
Zhong Zhang ◽  
Claudia Breidt
Keyword(s):  
Carbon Fibre ◽  
Fibre Surface ◽  
Surface Treatments ◽  
Epoxy Composites ◽  
Short Carbon

Study of carbon fibre surface treatments by dynamic mechanical analysis

1993 ◽  
Vol 28 (12) ◽  
pp. 3353-3366 ◽  
Author(s):  
B. Harris ◽  
O. G. Braddell ◽  
D. P. Almond ◽  
C. Lefebvre ◽  
J. Verbist
Keyword(s):  
Carbon Fibre ◽  
Dynamic Mechanical Analysis ◽  
Fibre Surface ◽  
Mechanical Analysis ◽  
Surface Treatments ◽  
Dynamic Mechanical

Selective self-assembly of semi-metal straight and branched nanorods on inert substrates

2017 ◽  
Author(s):  
X.-S. Wang ◽  
S.S. Kushvaha ◽  
X. Chu ◽  
H. Zhang ◽  
Z. Yan ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Vapor Deposition ◽  
Self Assembly ◽  
Physical Vapor Deposition ◽  
The Self ◽  
Scanning Tunnelling Microscope ◽  
Drift Correction ◽  
Atomic Structures ◽  
Scanning Tunnelling

This article discusses the selective self-assembly of semi-metal straight and branched nanorods on inert substrates. In particular, it describes antimony (Sb) nanorods and bismuth (Bi) nanobelts on inert substrates by physical vapor deposition in vacuum without using any catalyst and nanoscale template. After describing the experimental and drift correction procedures, the article reviews previous studies of semi-metal growth on inert substrates. It then measures the surface morphology and atomic structures of self-assembled Sb nanorods and Bi nanobelts using an in-situ scanning tunnelling microscope (STM) in ultrahigh vacuum (UHV). Based on these STM data, a mechanism for the self-assembly of straight and branched semi-metal nanorods is proposed.

scholarly journals Mechanical Properties, Surface Assessment, and Structural Analysis of Functionalized CFRPs after Accelerated Weathering

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4092
Author(s):  
Dionisis Semitekolos ◽  
Georgios Konstantopoulos ◽  
Aikaterini-Flora Trompeta ◽  
Craig Jones ◽  
Amit Rana ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Structural Integrity ◽  
Fibre Surface ◽  
Surface Treatments ◽  
Accelerated Weathering ◽  
Operational Conditions ◽  
Macro Scale ◽  
Interlaminar Shear

The present study focuses on the effect of two novel carbon fibre surface treatments, electropolymerisation of methacrylic acid and air pressure plasma, on the mechanical properties and structural integrity of carbon-fibre-reinforced composites under operational conditions. Extensive mechanical testing was applied, both in nano- and macro-scale, to assess the performance of the composites and the interphase properties after ultraviolet/humidity weathering. The results of the mechanical assessment are supported by structure, surface, and chemistry examination in order to reveal the failure mechanism of the composites. Composites with the electropolymerisation treatment exhibited an increase of 11.8% in interlaminar shear strength, while APP treatment improved the property of 23.9%, rendering both surface treatments effective in increasing the fibre-matrix adhesion. Finally, it was proven that the developed composites can withstand operational conditions in the long term, rendering them suitable for a wide variety of structural and engineering applications.

An improved design for an Scanning Tunnelling Microscope (STM) for use in a Transmission Electron Microscope (TEM)

1991 ◽  
Vol 49 ◽  
pp. 384-385
Author(s):  
W.K. Lo ◽  
J.C.H. Spence
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Mechanical Stability ◽  
Scanning Tunnelling Microscope ◽  
Reflection Mode ◽  
Specimen Holder ◽  
Transmission Electron ◽  
Scanning Tunnelling ◽  
Improved Design

An improved design for a combination Scanning Tunnelling Microscope/TEM specimen holder is presented. It is based on earlier versions which have been used to test the usefulness of such a device. As with the earlier versions, this holder is meant to replace the standard double-tilt specimen holder of an unmodified Philips 400T TEM. It allows the sample to be imaged simultaneously by both the STM and the TEM when the TEM is operated in the reflection mode (see figure 1).The resolution of a STM is determined by its tip radii as well as its stability. This places strict limitations on the mechanical stability of the tip with respect to the sample. In this STM the piezoelectric tube scanner is rigidly mounted inside the endcap of the STM holder. The tip coarse approach to the sample (z-direction) is provided by an Inchworm which is located outside the TEM vacuum.

On-Surface Radical Oligomerisation: A New Approach to STM Tip-Induced Reactions

2018 ◽  
Author(s):  
Gaolei Zhan ◽  
Younes Makoudi ◽  
Judicael Jeannoutot ◽  
Simon Lamare ◽  
Michel Féron ◽  
...  
Keyword(s):  
Sample Surface ◽  
Scanning Tunnelling Microscope ◽  
Transfer Event ◽  
New Approach ◽  
The Past ◽  
Organic Nanostructures ◽  
Scanning Tunnelling ◽  
New Strategy ◽  
Surface Fabrication ◽  
And Control

Over the past decade, on-surface fabrication of organic nanostructures has been widely investigated for the development of molecular electronic devices, nanomachines, and new materials. Here, we introduce a new strategy to obtain alkyl oligomers in a controlled manner using on-surface radical oligomerisations that are triggered by the electrons/holes between the sample surface and the tip of a scanning tunnelling microscope. The resulting radical-mediated mechanism is substantiated by a detailed theoretical study. This electron transfer event only occurs when <i>V</i><sub>s</sub> < -3 V or <i>V</i><sub>s</sub> > + 3 V and allows access to reactive radical species under exceptionally mild conditions. This transfer can effectively ‘switch on’ a sequence leading to formation of oligomers of defined size distribution due to the on-surface confinement of reactive species. Our approach enables new ways to initiate and control radical oligomerisations with tunnelling electrons, leading to molecularly precise nanofabrication.

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