scholarly journals Effect of Single-Walled Carbon Nanotubes on Strength Properties of Cement Composites

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1305 ◽  
Author(s):  
Jiayuan Kang ◽  
Salam Al-Sabah ◽  
Roger Théo
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Cement Composite ◽  
Strength Properties ◽  
Cement Composites ◽  
Dispersion Method ◽  
Single Walled Carbon ◽  
Compressive And Flexural Strengths ◽  
Walled Carbon Nanotubes ◽  
The Relationship

This study aimed to investigate the effects of single-walled carbon nanotubes (SWCNTs) on strength the properties of cement composites when surfactant (SAA) was applied as the dispersion method. TritonX-100 (TX10) was used as the SAA to pretreat SWCNTs, which has been proved to perform well in dispersing the agglomerates of SWCNTs. In this study, four different concentration of SWCNTs, namely 0.00 wt%, 0.02 wt%, 0.04 wt%, and 0.06 wt% by the mass of cement, were used to prepare cement composite specimens. The compressive strength and flexural strength of specimens were tested and recorded. The results show that the compressive and flexural strengths of cement composites decreased with the increase in the concentration of SWCNTs without the addition of TX10. However, when SWCNT suspensions were pretreated with TX10, the strength variation pattern changed; the compressive and flexural strengths of cement composites increased as a function of the concentration of SWCNTs, although there were reductions compared to non-TX10-treated specimens at all concentrations of SWCNTs. Furthermore, the relationship between the strength of cement composites and bulk density of specimens was considered.

Improvement of Early Compressive Strength in Belite Cement by Incorporating Silica Coated Single-Walled Carbon Nanotubes

2016 ◽  
Vol 718 ◽  
pp. 157-162 ◽  
Author(s):  
Wanchart Suprompituk ◽  
Papot Jaroenapibal
Keyword(s):  
Carbon Nanotubes ◽  
Compressive Strength ◽  
Cement Paste ◽  
Single Walled Carbon Nanotubes ◽  
Chemical Compositions ◽  
Cement Composites ◽  
Compression Tests ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Belite Cement

This work demonstrated the improvement of belite cement compressive strength by incorporating nanosilica coated single-walled carbon nanotubes (SWNTs@SiO2) into the cement paste. The structure and chemical compositions of SWNTs@SiO2 materials were characterized by transmission electron microscopy and energy dispersive X-ray spectroscopy techniques, respectively. Belite cement composites were prepared by mixing belite cement paste with different loadings of SWNTs@SiO2 ranging from 0.02 – 0.1 wt%. In order to measure the early strength of cement composites, the samples were aged for 7 days, and then subjected to compression tests. Effects of uncoated SWNTs and silica coated SWNTs loadings on the compressive strength of belite cement composites were studied. Without pre-coating SWNTs with nanosilica, the SWNTs additives led to large decrease in compressive strength of belite cement composite. Improvements in compressive strength of belite cement are shown in samples that incorporated SWNTs@SiO2 loadings. The coating layer helps enhance bonding strength between reinforced SWNTs and the matrix, as well as promote hydration reactions in the cement paste. The highest increase in the compressive strength of 18.8 % is found in the sample with the minimal SWNTs@SiO2 loading of 0.02%.

scholarly journals Mapping Single Walled Carbon Nanotubes in Photosynthetic Algae by Single-Cell Confocal Raman Microscopy

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5121
Author(s):  
Silvia Orlanducci ◽  
Gianluca Fulgenzi ◽  
Andrea Margonelli ◽  
Giuseppina Rea ◽  
Taras K. Antal ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Excitation Energy Transfer ◽  
Single Walled Carbon Nanotubes ◽  
Raman Microscopy ◽  
Biological Behavior ◽  
Label Free ◽  
Single Walled Carbon ◽  
Spectroscopic Probes ◽  
Walled Carbon Nanotubes ◽  
The Relationship

Carbon nanotubes (CNTs) are among the most exploited carbon allotropes in the emerging technologies of molecular sensing and bioengineering. However, the advancement of algal nanobiotechnology and nanobionics is hindered by the lack of methods for the straightforward visualization of the CNTs inside the cell. Herein, we present a handy and label-free experimental strategy based on visible Raman microscopy to assess the internalization of single-walled carbon nanotubes (SWCNTs) using the model photosynthetic alga Chlamydomonas reinhardtii as a recipient. The relationship between the properties of SWCNTs and their biological behavior was demonstrated, along with the occurrence of excitation energy transfer from the excited chlorophyll molecules to the SWCNTs. The non-radiative deactivation of the chlorophyll excitation promoted by the SWCNTs enables the recording of Raman signals originating from cellular compounds located near the nanotubes, such as carotenoids, polyphosphates, and starch. Furthermore, the outcome of this study unveils the possibility to exploit SWCNTs as spectroscopic probes in photosynthetic and non-photosynthetic systems where the fluorescence background hinders the acquisition of Raman scattering signals.

An Atomic Modeling Method for the Buckling of Carbon Nanotubes

2011 ◽  
Vol 94-96 ◽  
pp. 1646-1650
Author(s):  
Bin Gao ◽  
Bao Guo Yang ◽  
Yu Zhou Sun ◽  
Lin Feng Yang
Keyword(s):  
Carbon Nanotubes ◽  
Stable State ◽  
Single Walled Carbon Nanotubes ◽  
Cement Composite ◽  
Modeling Method ◽  
Atomic Scale ◽  
Atomic Interaction ◽  
Single Walled Carbon ◽  
Buckling Behavior ◽  
Walled Carbon Nanotubes

An atomic scale modeling method is provided to study the buckling behavior of the single-walled carbon nanotubes. The Brenner potential is employed to describe the C-C atomic interaction,and the stable state is determined using the Norton’s method with the first- and second-order derivatives of the total energy with respect to the atomic coordinates. The reponse of single-walled carbon nanotubes under the axial compressive, twisting and buckling loads is modeled using the developed Fortran codes, and the buckling patterns are obtained. The proposed method can be used to study the mechanical property of cabon nanotubes and explore its application in the cement composite in future.

Dynamic Deflection of a Single-Walled Carbon Nanotube Under Ballistic Impact Loading

2011 ◽  
Vol 2 (4) ◽  
Author(s):  
Demetris Pentaras ◽  
Isaac Elishakoff
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Elastic Beam ◽  
Single Walled Carbon Nanotubes ◽  
Ballistic Impact ◽  
Beam Model ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
The Relationship

The dynamic deflections of geometrically different single-walled carbon nanotubes are determined under various high-velocity impacts and for different positions at which ballistic impact is applied. Elastic beam model is applied to study the dynamic deflection of single-walled carbon nanotubes for two cases of boundary conditions, namely to clamped–clamped and clamped-free single-walled carbon nanotubes. Moreover, we examine the relationship between the single-walled carbon nanotube radius, the relative position at which the ballistic impact takes place, the speed of the object (e.g., bullet) that strikes the nanotube, and the deflection of the nanotube for a specific bullet size and shape as was used by recent study in the literature.

Purity Evaluation of Single-Walled Carbon Nanotubes Using Thermogravimetric Analysis

2013 ◽  
Vol 51 (2) ◽  
pp. 137-144
Author(s):  
Naesung Lee ◽  
Jeung Choon Goak ◽  
Tae Yang Kim ◽  
Jongwan Jung ◽  
Young-Soo Seo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermogravimetric Analysis ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Purity Evaluation ◽  
Walled Carbon Nanotubes
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