Modeling of Concrete Composite Induced by Multi-Walled Carbon Nanotubes Using Response Surface Methodology

In this present work a response surface optimization was done to study the effect of the variables curing days, Multi-Walled Carbon Nanotube (MWCNT) and plasticizer on the strength of concrete. The variables were varied in three levels and a total of 15 cylindrical specimens were fabricated based on the experimental design. For measuring the effect of the variables, split tensile strength test was carried out on the specimens. For proper mixing of the MWCNT, sonication is carried out with plasticizer and then this mixture is added with water and the specimens are fabricated. Only the terms with p < 0.05 are chosen as significant. The results shows that an increase in MWCNT %, increased the split tensile strength of the concrete.

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Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi-Walled Carbon Nanotubes

Chemical Engineering & Technology ◽

10.1002/ceat.201700351 ◽

2018 ◽

Vol 41 (9) ◽

pp. 1857-1870 ◽

Cited By ~ 6

Author(s):

Maliheh Raji ◽

Hossein Abolghasemi ◽

Jaber Safdari ◽

Ali Kargari

Keyword(s):

Carbon Nanotubes ◽

Response Surface ◽

Liquid Membrane ◽

Emulsion Liquid Membrane ◽

Response Surface Optimization ◽

Multi Walled Carbon Nanotubes ◽

Surface Optimization ◽

Walled Carbon Nanotubes

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Mechanical Assessment of Glass Ionomer Cements Incorporated with Multi-Walled Carbon Nanotubes for Dental Applications

Oral ◽

10.3390/oral1030019 ◽

2021 ◽

Vol 1 (3) ◽

pp. 190-198

Author(s):

Manuela Spinola ◽

Amanda Maria Oliveira Dal Piva ◽

Patrícia Uchôas Barbosa ◽

Carlos Rocha Gomes Torres ◽

Eduardo Bresciani

Keyword(s):

Carbon Nanotubes ◽

Tensile Strength ◽

Compressive Strength ◽

Glass Ionomer Cement ◽

High Viscosity ◽

Glass Ionomer Cements ◽

Glass Ionomer ◽

Multi Walled Carbon Nanotube ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Background: Nanoparticles such as multi-walled carbon nanotubes present resistance, resilience and biocompatibility with human tissues and could be incorporated into glass ionomer cement materials to improve their characteristics. Therefore, the aim of the present study was to evaluate the effect of multi-walled carbon nanotube (MWCNT) incorporation on different glass ionomer cements’ compressive (σc) and diametral tensile strengths (σt). Methods: Eighty (80) specimens were divided into four groups (N = 20/gr) according to the glass ionomer cement type (conventional and high-viscosity) and the presence or absence of multi-walled carbon nanotubes. Samples were kept in water for 24 h prior to the tests. Data were analyzed using two-way ANOVA and Tukey’s test (p = 0.05). Results: For both σc (p = 0.1739) and σt (p = 0.2183), the glass ionomer cements’ viscosity did not influence the results. The presence of MWCNTs decreased the mean compressive strength values (p = 0.0001) and increased the diametral tensile strength (p = 0.0059). For both conventional and high-viscosity glass ionomer cements, the compressive strength values were higher than the tensile strength data. Conclusions: Regardless of the cement viscosity, the multi-walled carbon nanotube incorporation reduced the compressive strength and increased the tensile strength values.

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Functionalized multi-walled carbon nanotubes and hydroxyapatite nanorods reinforced with polypropylene for biomedical application

Scientific Reports ◽

10.1038/s41598-020-80767-3 ◽

2021 ◽

Vol 11 (1) ◽

Cited By ~ 1

Author(s):

Fahad Saleem Ahmed Khan ◽

N. M. Mubarak ◽

Mohammad Khalid ◽

Rashmi Walvekar ◽

E. C. Abdullah ◽

...

Keyword(s):

Carbon Nanotubes ◽

Tensile Strength ◽

Mechanical Characteristics ◽

Biomedical Application ◽

Thermal Study ◽

Melt Compounding ◽

Industry Applications ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

And Cartilage

AbstractModified multi-walled carbon nanotubes (f-MWCNTs) and hydroxyapatite nanorods (n-HA) were reinforced into polypropylene (PP) with the support of a melt compounding approach. Varying composition of f-MWCNTs (0.1–0.3 wt.%) and nHA (15–20 wt.%) were reinforced into PP, to obtain biocomposites of different compositions. The morphology, thermal and mechanical characteristics of PP/n-HA/f-MWCNTs were observed. Tensile studies reflected that the addition of f-MWCNTs is advantageous in improving the tensile strength of PP/n-HA nanocomposites but decreases its Young’s modulus significantly. Based on the thermal study, the f-MWCNTs and n-HA were known to be adequate to enhance PP’s thermal and dimensional stability. Furthermore, MTT studies proved that PP/n-HA/f-MWCNTs are biocompatible. Consequently, f-MWCNTs and n-HA reinforced into PP may be a promising nanocomposite in orthopedics industry applications such as the human subchondral bone i.e. patella and cartilage and fabricating certain light-loaded implants.

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The influence of functionalization time of carbon nanotube on the mechanical properties of the epoxy composites

Journal of Composite Materials ◽

10.1177/0021998317701988 ◽

2017 ◽

Vol 51 (12) ◽

pp. 1693-1701 ◽

Cited By ~ 4

Author(s):

EA Zakharychev ◽

EN Razov ◽

Yu D Semchikov ◽

NS Zakharycheva ◽

MA Kabina

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Tensile Strength ◽

Elastic Modulus ◽

Carbon Nanotube ◽

Composite Materials ◽

Polymer Composites ◽

Epoxy Composites ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

This paper investigates the structure, length, and percentage of functional groups of multi-walled carbon nanotubes (CNT) depending on the time taken for functionalization in HNO3 and H2SO4 mixture. The carbon nanotube content and influence of functionalization time on mechanical properties of polymer composite materials based on epoxy matrix are studied. The extreme dependencies of mechanical properties of carbon nanotube functionalization time of polymer composites were established. The rise in tensile strength of obtained composites reaches 102% and elastic modulus reaches 227% as compared to that of unfilled polymer. The composites exhibited best mechanical properties by including carbon nanotube with 0.5 h functionalization time.

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Highly sensitive compression sensors using three-dimensional printed polydimethylsiloxane/carbon nanotube nanocomposites

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x19835953 ◽

2019 ◽

Vol 30 (8) ◽

pp. 1216-1224 ◽

Cited By ~ 11

Author(s):

Mohammad Charara ◽

Mohammad Abshirini ◽

Mrinal C Saha ◽

M Cengiz Altan ◽

Yingtao Liu

Keyword(s):

Carbon Nanotubes ◽

Electron Microscope ◽

Carbon Nanotube ◽

Scanning Electron Microscope ◽

Three Dimensional ◽

Multi Walled Carbon Nanotube ◽

Highly Sensitive ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Scanning Electron

This article presents three-dimensional printed and highly sensitive polydimethylsiloxane/multi-walled carbon nanotube sensors for compressive strain and pressure measurements. An electrically conductive polydimethylsiloxane/multi-walled carbon nanotube nanocomposite is developed to three-dimensional print compression sensors in a freestanding and layer-by-layer manner. The dispersion of multi-walled carbon nanotubes in polydimethylsiloxane allows the uncured nanocomposite to stand freely without any support throughout the printing process. The cross section of the compression sensors is examined under scanning electron microscope to identify the microstructure of nanocomposites, revealing good dispersion of multi-walled carbon nanotubes within the polydimethylsiloxane matrix. The sensor’s sensitivity was characterized under cyclic compression loading at various max strains, showing an especially high sensitivity at lower strains. The sensing capability of the three-dimensional printed nanocomposites shows minimum variation at various applied strain rates, indicating its versatile potential in a wide range of applications. Cyclic tests under compressive loading for over 8 h demonstrate that the long-term sensing performance is consistent. Finally, in situ micromechanical compressive tests under scanning electron microscope validated the sensor’s piezoresistive mechanism, showing the rearrangement, reorientation, and bending of the multi-walled carbon nanotubes under compressive loads, were the main reasons that lead to the piezoresistive sensing capabilities in the three-dimensional printed nanocomposites.

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Self-assembly fabrication of a graphene/multi-walled carbon nanotube hybrid material for suppressing potential heat radiation and toxic effluent

RSC Advances ◽

10.1039/c5ra19227g ◽

2015 ◽

Vol 5 (125) ◽

pp. 103365-103372 ◽

Cited By ~ 1

Author(s):

Lei Liu ◽

Dong Wang ◽

Yuan Hu

Keyword(s):

Carbon Nanotubes ◽

Aqueous Solution ◽

Graphene Oxide ◽

Carbon Nanotube ◽

Hybrid Material ◽

Self Assembly ◽

Heat Radiation ◽

Multi Walled Carbon Nanotube ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Negative graphene oxide was combined with positive chitosan-modified multi-walled carbon nanotubes in aqueous solution and then thermally reduced to fabricate a multi-walled carbon nanotube/graphene (MWCNT/G) hybrid material.

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Statistical Analysis of the Tensile Strength of Carbon Nanotubes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.41-42.27 ◽

2008 ◽

Vol 41-42 ◽

pp. 27-32 ◽

Cited By ~ 1

Author(s):

Chun Sheng Lu

Keyword(s):

Carbon Nanotubes ◽

Tensile Strength ◽

Information Criterion ◽

Strength Distribution ◽

Data Sets ◽

Weibull Statistics ◽

Multi Walled Carbon Nanotubes ◽

Simple Extrapolation ◽

Walled Carbon Nanotubes ◽

Optimal Strength

Two available strength data sets of single-walled and multi-walled carbon nanotubes are analysed, and the effects of sample sizes on their tensile strengths are investigated. A minimum information criterion is applied to determine the optimal strength distribution. The results show that, in contrast to a two-parameter Weibull distribution, lognormal distribution seems to be a more suitable choice. A simple extrapolation of classical Weibull statistics to nanoscales may result in overestimation on the tensile strength of carbon nanotubes.

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Optimization of sulfate removal from wastewater using magnetic multi-walled carbon nanotubes by response surface methodology

Water Science & Technology ◽

10.2166/wst.2017.424 ◽

2017 ◽

Vol 76 (10) ◽

pp. 2593-2602 ◽

Cited By ~ 9

Author(s):

Vahid Alimohammadi ◽

Mehdi Sedighi ◽

Ehsan Jabbari

Keyword(s):

Carbon Nanotubes ◽

Response Surface Methodology ◽

Response Surface ◽

Polynomial Equation ◽

X Ray Diffraction ◽

Adsorption Models ◽

Sulfate Removal ◽

Transmission Electron ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Abstract This paper reports a facile method for removal of sulfate from wastewater by magnetic multi-walled carbon nanotubes (MMWCNTs). Multi-walled carbon nanotubes and MMWCNTs were characterized by X-ray diffraction, Raman, transmission electron microscopy, Fourier transform infrared spectroscopy, and vibrating sample magnetometry. The results of the analysis indicated that MMWCNTs were synthesized successfully. The MMWCNTs can be easily manipulated in a magnetic field for the desired separation, leading to the removal of sulfate from wastewater. Response surface methodology (RSM) coupled with central composite design was applied to evaluate the effects of D/C (adsorbent dosage per initial concentration of pollutant (mgadsorbent/(mg/l)initial)) and pH on sulfate removal (%). Using RSM methodology, a quadratic polynomial equation was obtained, for removal of sulfate, by multiple regression analysis. The optimum combination for maximum sulfate removal of 93.28% was pH = 5.96 and D/C = 24.35. The experimental data were evaluated by the Langmuir and Freundlich adsorption models. The adsorption capacity of sulfate in the studied concentration range was 56.94 (mg/g). It was found out that the MMWCNTs could be considered as a promising adsorbent for the removal of sulfate from wastewater.

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