Nanoscale Structural and Mechanical Characterization of MWCNT-Reinforced Polymer Composites

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Wyatt Leininger ◽  
Xinnan Wang ◽  
X. W. Tangpong ◽  
Marshall McNea
Keyword(s):  
Elastic Modulus ◽  
Tensile Load ◽  
Small Strain ◽  
Experimental Result ◽  
Multiwalled Carbon ◽  
Atomic Force ◽  
Reinforced Polymer ◽  
In Situ Deformation

In this study, the elastic modulus of 1 wt. % multiwalled carbon nanotube (MWCNT) reinforced epoxy composite was characterized using an in-house designed micro/nano tensile load stage in conjunction with an atomic force microscope (AFM). The surface of the nanocomposite was scanned by the AFM during intermittent tensile testing, and micro/nanoscale deformation was observed. The MWCNT reinforced nanocomposite exhibited a 23% increase in the measured elastic modulus compared with the pure epoxy. The elastic moduli of the nanocomposite were also predicted by the Halpin–Tsai and Hui–Shia models, and the former offered a better correlation with the experimental result when only the load bearing outer layer of the MWCNTs was considered. The combination of the load stage and AFM is capable of capturing the in situ deformation progress for small strain increments.

Nanoscale Structural and Mechanical Characterization of Nanowire-Reinforced Polymer Composites

2011 ◽  
Author(s):  
Wyatt Leininger ◽  
Xinnan Wang ◽  
X. W. Tangpong ◽  
Marshall McNea
Keyword(s):  
Elastic Modulus ◽  
Tensile Testing ◽  
Mechanical Characterization ◽  
Tensile Load ◽  
Small Strain ◽  
Epoxy Composites ◽  
Atomic Force ◽  
Reinforced Polymer ◽  
Multi Walled Carbon Nanotube

In this study, the mechanical properties of multi-walled carbon nanotube (MWCNT) reinforced epoxy composites were characterized using an in-house designed micro/nano tensile load stage in conjunction with an atomic force microscope (AFM). The surface of the nanocomposite was scanned by the AFM during intermittent tensile testing. Micro/nano deformation was observed, and the reinforcing mechanisms were discussed in conjunction with architecture and elastic modulus. Results show that the MWCNT reinforced nanocomposite has an increased elastic modulus. The Halpin-Tsai and Hui-Shia models were compared to the experimental results, and the Halpin-Tsai was found to correlate when only the load bearing outer layer of the MWCNTs were considered. Additionally, it is concluded that the combination of the load stage and AFM is capable of capturing insitu deformation progress for small strain increments.

In Situ Chemical Functionalization of a Single Carbon Nanotube Functionalized AFM Tip using a Correlated Optical and Atomic Force Microscope

2011 ◽  
Vol 1318 ◽  
Author(s):  
Ifat Kaplan-Ashiri ◽  
Eric J. Titus ◽  
Katherine A. Willets
Keyword(s):  
Carbon Nanotube ◽  
Atomic Force Microscope ◽  
Spectroscopic Characterization ◽  
Optical Microscope ◽  
Multiwalled Carbon ◽  
Atomic Force ◽  
Before And After ◽  
Afm Probe

ABSTRACTWe present a method for performing nanoscale wet chemistry on single carbon nanotubes as well as spectroscopic characterization of the functionalized molecules using a coupled atomic force microscope (AFM) and optical microscope. An AFM probe was functionalized with a single multiwalled carbon nanotube and then locally oxidized by dipping it into nitric acid (HNO3) in situ using AFM manipulation. Raman scattering was collected from the carbon nanotube functionalized probe before and after the oxidation reaction. An increase in the Raman D band was observed after the acid treatment, demonstrating that oxidation had occurred. This is the first step towards developing a real-time technique for dynamic studies of chemical reactions on single nanoparticles/molecules.

Fabrication and Mechanical Characterization of Carbon Nanotube Based Nanoknives

2006 ◽  
Author(s):  
Gurpreet Singh ◽  
Paul Rice ◽  
Richard J. McIntosh ◽  
Roop L. Mahajan
Keyword(s):  
Carbon Nanotubes ◽  
Mechanical Characterization ◽  
Breaking Strength ◽  
Welding Process ◽  
Multiwalled Carbon ◽  
Atomic Force ◽  
Initial Force ◽  
Scanning Electron

A prototype microtome knife for cutting ~100 nm thick slices of frozen-hydrated biological samples has been constructed by use of multiwalled carbon nanotubes (MWCNT). A piezoelectric-based 3-D manipulator was used inside a scanning electron microscope (SEM) to select and position individual MWCNTs, which were subsequently welded in place by electron beam-induced deposition (EBID). The device employs a pair of tungsten needles with provision to adjust the distance between the needle tips, accommodating various lengths of MWCNTs. We have performed experiments to test the breaking strength of the MWCNT in the completed device with an atomic force microscope (AFM) tip. An increasing force was applied at the midpoint of the nanotube until failure, which was observed in situ in the SEM. The initial force/deflection data appear promising, and efforts are underway to characterize and improve the strength of the device by conducting more such tests and modifying the welding process.

scholarly journals A Universal Model for the Log-Normal Distribution of Elasticity in Polymeric Gels and Its Relevance to Mechanical Signature of Biological Tissues

Biology ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 64
Author(s):  
Arnaud Millet
Keyword(s):  
Elastic Modulus ◽  
Normal Distribution ◽  
Biological Tissues ◽  
Force Microscopy ◽  
Polymeric Gels ◽  
Atomic Force ◽  
Clear Explanation ◽  
Log Normal ◽  
Log Normal Distribution

The mechanosensitivity of cells has recently been identified as a process that could greatly influence a cell’s fate. To understand the interaction between cells and their surrounding extracellular matrix, the characterization of the mechanical properties of natural polymeric gels is needed. Atomic force microscopy (AFM) is one of the leading tools used to characterize mechanically biological tissues. It appears that the elasticity (elastic modulus) values obtained by AFM presents a log-normal distribution. Despite its ubiquity, the log-normal distribution concerning the elastic modulus of biological tissues does not have a clear explanation. In this paper, we propose a physical mechanism based on the weak universality of critical exponents in the percolation process leading to gelation. Following this, we discuss the relevance of this model for mechanical signatures of biological tissues.

In Situ Characterization of the Mechanical Behavior of Gecko's Spatulae by Atomic Force Microscopy

2013 ◽  
Vol 22 ◽  
pp. 85-93
Author(s):  
Shuang Yi Liu ◽  
Min Min Tang ◽  
Ai Kah Soh ◽  
Liang Hong
Keyword(s):  
Mechanical Behavior ◽  
Hierarchical Level ◽  
Intrinsic Properties ◽  
In Situ Characterization ◽  
Force Microscopy ◽  
Atomic Force ◽  
Theoretical Predictions ◽  
Multi Mode

In-situ characterization of the mechanical behavior of geckos spatula has been carried out in detail using multi-mode AFM system. Combining successful application of a novel AFM mode, i.e. Harmonix microscopy, the more detail elastic properties of spatula is brought to light. The results obtained show the variation of the mechanical properties on the hierarchical level of a seta, even for the different locations, pad and stalk of the spatula. A model, which has been validated using the existing experimental data and phenomena as well as theoretical predictions for geckos adhesion, crawling and self-cleaning of spatulae, is proposed in this paper. Through contrast of adhesive and craw ability of the gecko on the surfaces with different surface roughness, and measurement of the surface adhesive behaviors of Teflon, the most effective adhesion of the gecko is more dependent on the intrinsic properties of the surface which is adhered.

Anin situatomic force microscope for normal-incidence nanofocus X-ray experiments

2016 ◽  
Vol 23 (5) ◽  
pp. 1110-1117 ◽  
Author(s):  
M. V. Vitorino ◽  
Y. Fuchs ◽  
T. Dane ◽  
M. S. Rodrigues ◽  
M. Rosenthal ◽  
...  
Keyword(s):  
Thin Film ◽  
Atomic Force Microscope ◽  
High Speed ◽  
Normal Incidence ◽  
Organic Thin Film ◽  
X Ray ◽  
Atomic Force ◽  
Synchrotron Beamlines

A compact high-speed X-ray atomic force microscope has been developed forin situuse in normal-incidence X-ray experiments on synchrotron beamlines, allowing for simultaneous characterization of samples in direct space with nanometric lateral resolution while employing nanofocused X-ray beams. In the present work the instrument is used to observe radiation damage effects produced by an intense X-ray nanobeam on a semiconducting organic thin film. The formation of micrometric holes induced by the beam occurring on a timescale of seconds is characterized.

In Situ Atomic Force Microscopy Tip-Induced Deformations and Raman Spectroscopy Characterization of Single-Wall Carbon Nanotubes

Nano Letters ◽  
2012 ◽  
Vol 12 (8) ◽  
pp. 4110-4116 ◽  
Author(s):  
P. T. Araujo ◽  
N. M. Barbosa Neto ◽  
H. Chacham ◽  
S. S. Carara ◽  
J. S. Soares ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Atomic Force Microscopy ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Force Microscopy ◽  
Atomic Force
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