In this article, the numerical and experimental results for buckling analysis of a nanocomposite beams reinforced by nanorods are studied and compared. The Chebyshev–Ritz method is used to calculate the buckling numerically and compare it with the buckling test. Epoxy resin, glass's fiber, and nanorods are used to make composites. These nanorods are made using recycled materials. Also, bending and tensile tests are used to obtain the properties of these composites. In addition, the effect of various parameters such as Young's modulus, temperature change, Poisson's ratio, and boundary conditions, the strain gradient parameter, and different shape function is investigated. The addition of nanorods increases the strength and stiffness of composites and increases the critical buckling load. Actually, the made nanorods are used as a reinforcement in matrix, thus in the made nanocomposites, fracture and buckling tests are done and the results indicate that the inclusion of nanorods (0.32%) increases the critical buckling load by 16.4%. A facile hydrothermal method to synthesis the nano rodes has a less cost with the other methods, thus by adding a small percentage of it to the composite, the stiffness of the structure increases. According to the results and the significant increase in Young's modulus and critical buckling load and the cost‐effectiveness of carbon nanorods (CNRs) made from recycled materials, these environmentally friendly reinforcements can be used in various industries such as machine body construction, automobile manufacturing, shipbuilding and construction of type's turbines.
Using potato peels and hydrothermal methods, CNRs produced.
These CNRs are useful, and production is cheap and no harm environmental.
Buckling sample include of glass fiber, without and with CNRs and epoxy resin.
Third order shear deformation beam theory and Chebyshev–Ritz are used
Theoretical and experimental buckling critical load are compared.


The theoretical and experimental buckling analysis of a nanocomposite beams reinforced by nanorods made of recycled materials

Converting biowaste into a functional product is put to the test by the growing amount of biowaste in the world and the environmental problems it causes. In this research study, we synthesized, characterized, and evaluated bluish-green luminescent carbon nanodots (CNDs) from cow dung and expired tomato sauces via a hydrothermal synthesis method at 160 °C for 8 h. The carbon nanodots were fabricated without additional passivating agents and exhibited good physicochemical and optical properties. The intrinsic properties of carbon nanodots were characterized using various spectral techniques. First, we evaluated the cytotoxic potential of carbon nanodots against A-375 human melanoma cell lines. This study revealed that carbon nanodots exhibited potent cytotoxicity and significantly inhibited the proliferation of A-375 cells in a dose-dependent manner. Next, we demonstrated these carbon nanodot's free radical scavenging potential by employing 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The bluish-green fluorescent carbon nanodots fabricated using a green synthesis approach have broad potential for biological applications. 

In Vitro Cytotoxic Potential of Cow dung and expired tomato sauces-derived Carbon nanodots Against A-375 human melanoma cell line

In this study, the challenges of using reduced graphene oxide in the production of thick parts were investigated. The kinetic effects of the particles on the curing reaction rate can cause the parts to fracture during curing because of the increase in internal stresses. In this regard, using various kinetic models, the trend of temperature increase in pure unsaturated polyester resin (Neat UP) and resin containing 0.5 wt% of reduced graphene oxide (UPRGO) were investigated. The heat transfer equation was solved using programming code in MATLAB software, and the results of the modeling were compared with the experimental results. In the following, the role of the variation in density, convection heat transfer, and thermal conductivity on the prediction of temperature at different points in the parts is evaluated. The results showed that the choice of kinetic model could play an effective role in predicting the temperature in the parts. Considering the density variation, changes in the thermal conductivity and convection heat transfer coefficient could play an effective role in matching the experimental and theoretical results. An increase in temperature causes a decrease in the structural regularity of the resin network, intensifies phonon scattering, and decreases in the thermal conductivity coefficient.
The RGO particles have influenced the reaction rate and the temperature gradients of thick parts during curing.
The influence of different parameters and kinetics during the curing process of polyester resin was observed on temperature changes.
The best prediction of temperature changes was provided by Vyazovkin's model, which had a high accuracy between the experimental and theoretical results.
The thermal conductivity coefficient is changed due to the changes in the contribution of the phonon thermal transport.
Considering the changes in density with the conversion degree improved the agreement between the experimental and theoretical results.


Improving temperature prediction during curing of thick parts of unsaturated polyester resin/reduced graphene oxide composites

Abstract In this study, the challenges of using nanoparticles such as graphene oxide (GO) and modified graphene oxide (MGO) in the production of thick parts were investigated. In addition, using various kinetic models, the trend of temperature increases in pure unsaturated polyester resin (UPR), and UPR containing GO and MGO were investigated. The heat transfer equations were solved using programming code in MATLAB software. In the following, the role of the variation in density, convection heat transfer coefficient, and thermal conductivity coefficient on the prediction of temperature at different points of the parts is evaluated. The findings indicated that the choice of the kinetic model can play an effective role in predicting the temperature in the parts. An increased temperature causes a decrease in the structural regularity of the resin network and intensifies phonon scattering to decrease, and will eventually cause a decrease in the thermal conductivity coefficient. Highlights The mathematical modeling was developed on the curing of unsaturated polyester nanocomposite. The cure kinetic models and thermal properties had important roles in the model accuracy. The best prediction of temperature changes was provided by Vyazovkin's model. The results of developed model satisfactorily matched the experimental data. 

Heat transfer prediction during curing of thick part of unsaturated polyester resin containing nanoparticles of graphene oxide and modified graphene oxide

Sustainable potassium-doped graphene oxide from oak fruit agricultural waste for a synergistically improved nanofluid-surfactant slug for enhancing oil recovery

Fluorescent polymers have exciting applications in sensing, imaging, and probes. Agricultural waste is increasingly being used to develop fluorescent nanomaterials due to technology, cost, and waste management advantages. This study developed fluorescent carbon‐based nanomaterials, that is, potassium doped graphene oxide (K‐GO) from Quercus ilex waste and used them to optimize fluorescent epoxy nanocomposites. The resulting nanocomposites showed significant enhancement in tensile strength with only 0.05 wt% of the renewable nanomaterial. The developed fluorescent epoxy nanocomposites have enhanced thermal and mechanical properties and can be used in sensing, imaging, and other applications.

Development of fluorescent epoxy composite with carbon‐based nanomaterial additives derived from agricultural waste

In this study, high-crystallinity single walled carbon nanotubes (H-SWNTs) were prepared by high-temperature thermal annealing at 1800 °C and a self-heating shape memory polyurethane nanocomposite with excellent self-heating characteristics was developed within a few seconds by irradiation with near-infrared rays. With a simple method (heat treatment), impurities at the surface of H-SWNTs were removed and at the same time the amorphous structure converted into a crystalline structure, improving crystallinity. Therefore, high conductivity (electric, thermal) and interfacial affinity with PU were increased, resulting in improved mechanical, thermal and electric properties. The electrical conductivity of neat polyurethane was enhanced from ~10–11 S/cm to 4.72 × 10−8 S/cm, 1.07 × 10−6 and 4.66 × 10−6 S/cm, while the thermal conductivity was enhanced up to 60% from 0.21 W/mK, 0.265 W/mK and 0.338 W/mK for the composites of 1, 3 and 5 wt%, respectively. Further, to achieve an effective photothermal effect, H-SWNTs were selected as nanofillers to reduce energy loss while increasing light-absorption efficiency. Thereafter, near-infrared rays of 818 nm were directly irradiated onto the nanocomposite film to induce photothermal properties arising from the local surface plasmon resonance effect on the CNT surface. A self-heating shape memory composite material that rapidly heated to 270 °C within 1 min was developed, even when only 3 wt.% of H-SWNTs were added. The results of this study can be used to guide the development of heat-generating coating materials and de-icing materials for the wing and body structures of automobiles or airplanes, depending on the molding method.

/pdf/easy-fast-self-heating-polyurethane-nanocomposite-with-the-29svxi19.pdf

Easy, Fast Self-Heating Polyurethane Nanocomposite with the Introduction of Thermally Annealed Carbon Nanotubes Using Near-Infrared Lased Irradiation

Skutterudite compounds have been studied as potential thermoelectric materials due to their high thermoelectric efficiency, which makes them attractive candidates for applications in thermoelectric power generation. In this study, the effects of double-filling on the thermoelectric properties of the CexYb0.2−xCo4Sb12 skutterudite material system were investigated through the process of melt spinning and spark plasma sintering (SPS). By replacing Yb with Ce, the carrier concentration was compensated for by the extra electron from Ce donors, leading to optimized electrical conductivity, Seebeck coefficient, and power factor of the CexYb0.2−xCo4Sb12 system. However, at high temperatures, the power factor showed a downturn due to bipolar conduction in the intrinsic conduction regime. The lattice thermal conductivity of the CexYb0.2−xCo4Sb12 skutterudite system was clearly suppressed in the range between 0.025 and 0.1 for Ce content, due to the introduction of the dual phonon scattering center from Ce and Yb fillers. The highest ZT value of 1.15 at 750 K was achieved for the Ce0.05Yb0.15Co4Sb12 sample. The thermoelectric properties could be further improved by controlling the secondary phase formation of CoSb2 in this double-filled skutterudite system.

/pdf/investigation-of-the-effect-of-double-filler-atoms-on-the-jhl5eg9s.pdf

Investigation of the Effect of Double-Filler Atoms on the Thermoelectric Properties of Ce-YbCo4Sb12

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Development of fluorescent epoxy composite with carbon‐based nanomaterial additives derived from agricultural waste

Easy, Fast Self-Heating Polyurethane Nanocomposite with the Introduction of Thermally Annealed Carbon Nanotubes Using Near-Infrared Lased Irradiation

Investigation of the Effect of Double-Filler Atoms on the Thermoelectric Properties of Ce-YbCo4Sb12