Multi Walled Carbon Nano Research Articles

Processing and characterization of organic PU foam reinforced with nano particles

A flexible nano composite was synthesized using a mechanical agitator mixing process and reinforced with different wt.% of multi-walled carbon nano tubes, bamboo charcoal, and cupric oxide by absorption and hydrothermal reduction process. These foams have been studied and analyzed based on their physical behavioural property. The studies reveal that the nano fillers have brought exemplary advancements in the field of material science and application. Through the dielectric test, the determination of the electrical conductivity of the nano composite is done. Field Emission Scanning Electron Microscope (FESEM) has been used for observing the morphology, and images show homogeneity due to hydrothermal reduction process. The thermal stability of the nano composite foam was observed through Thermogravimetric Analysis (TGA). A drastic improvement can be seen in the thermal stability and electrical conductivity by adding small amount of nano particle reinforcement in the organic PU foam.

Improving the Performance of A Flat Plate Solar Collector Using Nanofluid as Working Fluid

Solar energy is the best alternative to limited fossil fuels. The foremost important means of utilizing solar energy are solar collectors. The most common types of solar collectors are flat plate solar collectors. A great deal of theoretical research has been conducted to enhance the flat plate solar collector efficiency. One effective way to increase the efficiency is by using an improved thermal properties fluid as nanofluid. In this paper, a numerical study has been made to enhance the efficiency and improve the performance of solar collector via the use of (Multi-Wall Carbon Nano Tube-water) MWCNT-H2O nanofluid instead of traditional fluid like water as working fluid under the weather of Mosul city / Iraq (36.3489° N, 43.1577° E). One dimensional dynamic model using implicit finite difference method was used. Solving energy conservation equations through the various layers of the solar system is the basis upon which the current model was based. Effects of nanoparticle volume fraction and mass flow rate on the working fluid stream temperature differences, and the thermal efficiency were studied. The mass flow rate was varied from 0.004 kg/s to 0.03 kg/s, while the volume fraction was varied from 0% to 6%. The results of "Nanofluid Based Flat Plate Solar Collector" were compared with the experimental results presented by [1]. The comparison established a good match between the current results and experimental results. The results showed an increase in the working fluid outlet and inlet temperature difference and collector thermal efficiency due to the addition of MWCNT nanoparticles. The temperature difference of "Nanofluid Based Flat Plate Solar Collector" was found 28.8⁰C at 0.014 kg/s and 6% in April, while it was 25 ⁰C at the same condition in the "Water Based Flat Plate Solar Collector case". Also, the thermal efficiency of "Nanofluid Based Flat Plate Solar Collector" was found 2.41% to 6.68% more than the "Water Based Flat Plate Solar Collector case".

Co-MOF-74 Embedded Interlayer for Increasing Sulfur Utilization in Lithium-Sulfur Batteries

Lithium-Sulfur (Li-S) battery is considered to be one of the most promising next generation battery because of its high theoretical capacity (1675 mAh/g) and high-energy density (2600 Wh/kg). However, Li-S battery still has challenges, such as electronic and ionic insulating property, shuttling effect, and sluggish reaction in Li2S2 to Li2S. Many researches have tried to improve electronic conductivity by using carbon materials such as Reduced Graphene Oxide and multi-wall carbon nano tube (MWCNT). MWCNT interlayer, which place between cathode and separator, demonstrated good electronic conductivity and physical barrier to prevent migration polysulfide cathode to anode. However, carbon materials are non-polar material so that it is hard to prevent polysulfide migration chemically. Therefore, many efforts have been attempted to mitigate shuttling effect chemically. Cobalt sulfides (CoS3, Co9S8...), Metal Organic Framework(MOF) facilitated adsorbing polysulfides chemically. Cobalt Sulfides not only mitigate shuttling effect by adsorb polysulfide anion but also promote the transformation of Li2S2 to Li2S. M-MOF-74, consisting of metal ion(M) and organic linkers (2,5-dioxido-1,4-benzenedicarboxylate, DOBDC), have been researched on Li-S battery system because of abundant unsaturated metal sites which adsorb polysulfide anion, and high specific surface area. In this report, Co-MOF-74 and MWCNT composites (Co-MOF-74@MWCNT) were synthesized by solvothermal method. Co-MOF-74@MWCNT interlayer was synthesized using a filtration method. Co-MOF-74@MWCNT interlayer placed between cathode and separator to act as physical and chemical barrier. This Co-MOF-74@MWCNT interlayer is compared to MWCNT interlayer. Prepared Co-MOF-74@MWCNT is confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy. SEM images confirmed that Co-MOF-74 particles distributed uniformly. Also, Co-MOF-74 particles surrounded by MWCNT. X-ray diffraction confirmed presence of Co-MOF-74 and MWCNT. Assembled batteries, which is prepared by Co-MOF-74@MWCNT interlayer and MWCNT interlayer, measured resistance by electrochemical impedance spectroscopy (EIS). Co-MOF-74@MWCNT interlayer cell (Co-MOF-74@MWCNT cell) showed higher resistance(Rct) than MWCNT interlayer cell (MWCNT cell). However, Co-MOF-74@MWCNT cell showed lower resistance (Rct) than without interlayer cell. According to CV test, Co-MOF-74 can promote redox reaction and showed small peak around 1.85V. Besides, through symmetric cell test, Co-MOF-74@MWCNT cell showed faster redox reaction than MWCNT cell. Furthermore, Co-MOF-74@MWCNT cell exhibited higher capacity than MWCNT cell. Co-MOF-74@MWCNT cell exhibited an initial capacity of 1415 mAh/g, 115% larger than the 1228 mAh/g of the MWCNT cell. Also, after 50 cycles Co-MOF-74@MWCNT cell showed 1202 mAh/g, 120% larger than the 996 mAh/g of the MWCNT cell. Voltage profile test exhibit the reason why Co-MOF-74@MWCNT cell showed higher capacity than MWCNT cell. The ratio of second plateau and first plateau of Co-MOF-74@MWCNT cell showed 2.79 and MWCNT cell showed 1.904. The ideal value is 3. Co-MOF-74@MWCNT cell showed 2.79 because Co-MOF-74 promote the utilization of sulfur. Besides, It can be proved that Co-MOF-74@MWCNT cell promotes Li2S2 to Li2S reaction through voltage profile test. In summary, various electrochemical analyses have confirmed that Co-MOF-74@MWCNT interlayer can be a physical and chemical barrier and promote transformation of Li2S2 to Li2S. Figure 1

Mechanical and thermal properties of a nanocomposite material which epoxy based and reinforced with polyvinyl alcohol nano fibers contained multiwalled carbon nanotube

In this study, the thermal and mechanical properties of nanocomposite materials were investigated. Produced nanocomposite materials are epoxy-based and reinforced with Multiwalled Carbon Nano Tube dopped polyvinyl alcohol (PVA) nanofibers. Nanofibers were produced by the electrospinning method. Nanofibers were used for reinforcement as 5, 10, and 15 number of layers. These nanocomposite materials were subjected to uniaxial tensile tests at constant tensile speed in accordance with ASTM D882-02 standards. Tensile strength, elasticity modulus, Poisson's ratio, and toughness values were obtained and these values were compared with the values of reference pure epoxy samples without the nanofiber. For obtaining the thermal properties of the samples Thermogravimetric and Differential Thermal Analysis were performed. In order to investigate the damage mechanisms, the fractured tensile test specimens' surfaces were visualized by Scanning Electron Microscopy. Mechanical and thermal properties of the epoxy were improved by using the PVA nanofibers dopped the MWCNT.

Investigation on forced convective heat transfer characteristics of carbon nanomaterial based nanofluids

For estimating capabilities of cooling in case of nano fluid materials experiments such as forced convective for steady state have been conducted made of two different Carbon nanomaterials, Multi-Walled Carbon Nano Tubes (MWCNT) and Multi-Walled Carbon Nano Coils (MWCN). Nanomaterials have been synthesized in house and they are denoted using the SEM and TEM. The nanofluids have been prepared by dispersing the nanomaterials, functionalized with hydrophilic groups, in the base fluids. The studies have been carried out for different flow conditions and different volume fractions of nanomaterials. The effective thermal conductivity of the nanofluids has been measured using KD2 probe. The experimentally determined convective heat transfer coefficient has been compared with the heat transfer coefficient obtained using the conventional correlations wherein the thermal conductivity and viscosity values experimentally measured have been substituted. In order to explain the process of the enhanced coefficient of heat transfer for nanofluids a sort of physical insight is given.

Amelioration of freeze thaw damage of concrete with multi-walled carbon nano tubes

PurposeIn cold areas, frost damage is the main factor for diminution of durability and serviceability of structures. Due to incessant freeze thaw regimes, micro cracks spread and deteriorate concrete to point of failure.Design/methodology/approachThe study aims to evaluate the fresh and hardened properties of concrete after thirty freeze-thaw cycles tailored with carbon nano tubes. For this purpose, samples with 0.4, 0.45, 0.48, 0.5 and 0.55 water cement ratio while 0.5 and 1% carbon nano tube (CNT) content by weight of cement were prepared.FindingsAt 0.48 water cement ratio and 0.5% CNT by weight of cement workability reduced by 37% and water absorption reduced by 0.04%. But compressive strength, split tensile strength and flexural strength increased by 15.38, 33.02 and 15.75%, respectively, after 30 freeze thaw cycles. Also, weight loss reduced with addition of 0.5% CNT by weight of cement after freeze thaw cycles.Originality/valueNovelty of this research is to tailor traditional concrete with new materials.

Thermal performance of nano-enriched form-stable PCM implanted in a pin finned wall-less heat sink for thermal management application

Integrated and efficient circuitry has become a crucial part of modern technology which urged the necessity in development of efficient and robust Thermal Management (TM) system for its steady operation under higher heat dissipation. Thus the research work aims to analyse the heat transfer performance of a novel wall-less heat sink packed with highly stable synthesised Hexamethylene Diisocyanate cross-linked Polyethylene Glycol-6000 based Form-Stable Phase Change Material (FS-PCM) for its suitability in passive TM systems with chemical and thermal stability till 1000 thermal cycles. An inclusion of 1 wt% (Multi-Wall Carbon Nano Tubes /Graphene nano Platelets) in FS-PCM improved its thermal conductivity by 61.73% (0.448 W/m-K) and 84.48% (0.511 W/m-K) respectively. The characterisation was carried out for its micro and nano structural morphology, elemental composition, chemical composition and thermal properties like thermal degradation, phase transition attributes, specific heat and thermal conductivity via Field Emission Scanning Electron Microscope, Energy Dispersive X-ray Spectroscopy, Carbon Hydrogen Nitrogen analyser, Fourier Transform Infrared Spectroscopy, Thermogravimetric Analysis, Differential Scanning Calorimetry and KD2 pro analyser respectively. The transient heat transfer study of square pin finned heat sink was performed under a set of ON/OFF duty cycles for various heat rates with different aspects of FS-PCMs. In addition, the effect of nanoparticle reduced the thermal difference of FS-PCM in heat sink. Furthermore, involvement of FS-PCM in energy storage characteristics was improved reducing the heat sink base temperature to a maximum of 9.77%. Finally, the experimental results were numerically validated using COMSOL software establishing its reliability for real-time avionics TM application.

Nanomodification: An efficient method to improve cement integrity in CO2 storage sites

Carbon Capture and Sequestration (CCS) technology is an effective strategy to mitigate greenhouse gases released into the atmosphere. One of the challenges of the CCS sites, however, is the degradation of class G cement used to seal-off the injected intervals. It is known that in the presence of brine in depleted reservoirs or aquifers, cement may degrade due to the interaction of its alkaline component (Portlandite) with carbonic acid, causing seepage of CO2 and environmental contamination. Given the surface area, stability and inhibition characteristics of nanomaterials, they might be a good option to improve the performance of the cement in CO2 storage sites. In this study, attempts are made to show how two reliable nanomaterials (Nano Glass Flakes (NGFs) and Multiwall Carbon Nano Tube (MWCNTs)) can be used to improve the integrity of the cement in CO2 storage sites. A series of pre-carbonation and post-carbonation tests were conducted on the cement samples modified by NGFs and MWCNTs to compare their performances under a real storage site condition. It was found that the samples with 0.5 wt% NGFs and 0.05 wt% MWCNTs have the best performance against the attack of CO2. They could significantly resist against the carbonation and prevent the severe chemical reactions taking place in the presence of CO2. Given the fact that NGF is significantly cheaper than MWCNT, it could be a good choice to reinforce the cement used in the CCS storage site.

Influence of MWCNT fillers on vibroacoustic characteristics of polymer nanocomposite and coated aircraft panels

Noise pollution is one of the major concerns around the globe, and it is the driving force behind the development of new sound absorption and insulation materials. In the present work, Multi-Walled Carbon Nano Tubes (MWCNT) is studied for its soundproofing characteristics on the aircraft panels and its effect subsequently on the vibroacoustic performance.The sound transmission loss (STL) property of all the samples was measured using impedance tube instrument. The MWCNT nanoparticles were reinforced in a polymer system with varying weight percentages (0.5%, 0.75%, 1%, 2% and 3%) and its effect on sound transmission loss of nanocomposites was initially evaluated. These coated samples of Aluminium and Fibre Metal Laminate (FML) were then tested to assess the influence of MWCNT on the vibro-acoustic characteristics of the panels. Interesting results are presented in terms of STL on the aircraft fuselage panels, which confirm that MWCNT coating can be considered as a promising passive noise treatment approach without much weight penalty. FML has displayed comparatively a good STL in the frequency band of 63 Hz–500 Hz, compared to aluminium. MWCNT coating thickness and direction of coating appear to play an important role to produce the best STL characters of aircraft panels.

Fabrication of an Impedimetric Immunosensor for Screening and Determination of Vincristine in Biological Samples

Terpenoids of medicinal plants are one of the most important sources of therapeutic drugs. Among them, Vincristine (VCR) is prescribed for a wide variety of cancer types. Therefore, development of sensitive methods for VCR determination is urgently required. Here, a label-free and highly sensitive impedimetric biosensor was fabricated for electrochemical detection of VCR. First, multi-wall carbon nano tubes (MWCNTs) were dropped on the surface of a glassy carbon electrode. Then, the VCR monoclonal antibody (Ab) was covalently immobilized on the MWCNTs via carbodiimide coupling reaction using N-(3-dimethylaminopropyl)-N'-ethyl carbodiimide and N-hydroxy succinimide. The step-by-step modification process was characterized by electrochemical impedance spectroscopy and cyclic voltammetry in presence of a redox probe [Fe(CN)6]3–/4–. The VCR concentration was measured through increasing impedance values in the corresponding specific binding of VCR to the Ab. The increased electron-transfer resistance (Ret) values were proportional to the concentration of VCR and the biosensor detected concentrations varied in the range of 0.2–50 nM with a detection limit of 8 × 10–2 nM (S/N = 3). Practical analytical utility of the proposed method was demonstrated by VCR determination in medicinal plant extracts and human serum samples with satisfactory recoveries. The proposed biosensor may be a promising alternative for screening of medicinal plants to produce VCR and for the determination of drug concentration in cancerous potions.

Performance and exergy analysis of a diesel engine run on petrodiesel and biodiesel blends containing mixed CeO2 and MoO3 nanocatalyst

In this research, the second law of thermodynamics was employed to analyze the exergy of a diesel engine fueled with diesel–biodiesel blends (B5 and B10) and hybrid nanocatalyst additives at three concentrations (30, 60 and 90 ppm), containing cerium oxide and molybdenum oxide on amide-functionalized multiwall carbon nano tubes (MWCNTs). The research engine was a single-cylinder, four-stroke, direct-injection, air-cooled diesel engine. The exergy analysis was performed under full load conditions, at four engine speeds (1700, 2100, 2500 and 2900 rpm). The results revealed that by increasing the amount of nanocatalysts (CeO2-MWCNTs and MoO3-MWCNTs) in the fuel blends, the net exergy work rate of the diesel engine increased for both fuel blends (B5 and B10). The maximum net exergy work rate of the diesel engine was 7.71 (25.33% of total fuel exergy rate) for the B10 + 90ppm fuel blends at 2500 rpm. The exergy efficiency of the diesel engine ranged from 17.97% to 31% for B5 and 18.3% to 31.7% for B10 fuel blends, respectively. B10 containing 90 ppm nanocatalyst showed the highest exergy efficiency, at an engine speed of 1700 rpm. All fuel blends containing nanocatalyst emitted less carbon monoxide, hydrocarbon and NOx compared with nanocatalyst-free fuel blends.

Synthesis of Magnetic Multiwalled Carbon Nano Tubes and Investigation of isotherm and kinetic models for cleanup of Carbaryl pesticide

<p>Abstract: Water is the main factor of movement and transport of pesticides and contamination of water by these pollutants is one of the most important challenges due to their widespread use and increased concentrations. Moreover, these compounds are on the U.S.EPA Priority Pollutant list because of the potential of accumulation and the property of damaging effects. In this study, multiwalled carbon nanotube-based magnetic nanoparticles were synthesized and used as an affective adsorbent for carbaryl pesticide. The properties of the synthesized Fe3O4@MWCNTs were characterized by TEM images and XRD analysis. The obtained data were studied by isotherm and kinetic models. Carbaryl adsorbed onto the synthesized adsorbent was compatible with the Langmuir isotherm (R2 =0.993). The maximum adsorption capacity (qmax) of the pesticide onto the Fe3O4-MWCNTs was obtained at 68.2 mg/g. The kinetic studies of the reactions showed that the adsorption process followed the pseudo-second order model with R2 ≥0.99 for all initial carbaryl concentrations. The adsorbent was extracted by magnet reused several times (six rounds) with a reasonable efficiency. The Fe3O4-MWCNTs have great potential for adsorption of carbaryl from water and wastewater due to high efficiency, easy separation and reusability.</p>

Effect of Organic Nano-Materials on Heavy Metals Concentration of Wheat Plants Inoculated With Piriformospora indica Fungus and Irrigated With Wastewater of Plating Industry

Removal of heavy metals from industrial effluents is one of the most important in environmental research. This research was done to investigate the adsorption effect of multiwall carbon nanotubes (MWNTs) and nano Zn-oxide on decreasing chromium (Cr) and cadmium (Cd) concentration in wheat inoculated with Piriformospora indica (P.indica) that irrigated with wastewater of plating industry. Treatments were consist of applying MWCNs (0 and 0.5 % (W/W)) and nano Zn-oxide (0 and 1.5 % (W/W)) in the soil irrigated with the wastewater of plating industry under wheat inoculated with P.indica. This research was done as a factorial experiment in the layout of completely randomized block design in three replication After 90 days, plants were harvested and plant Cd and Cr were measured using atomic absorption spectroscopy. Using MWCNs had significant effect on increasing cation exchangeable capacity of soil. Applying 0.5 % (W/W) MWCNs in the soil irrigated with waste water significantly decreased the soil Cd concentration by 11.7%, while the plant biomass was increased by 13.4%. In addition, applying 1.5 % (W/W) nano Zn-oxide significantly decreased the negative effect of heavy metal toxicity that can be related to the role of nano Zn-oxide on increasing soil sorption properties. However, the interaction effect of Zn and Cd cannot be ignored. The results of this study showed that applying MWCNs and nano Zn-oxide has a significant effect on decreasing phytoremediation efficiency in soil irrigated with wastewater of plating industries. However, the type and the amount of heavy metals in wastewater cannot be ignored.

Investigation on mechanical properties of Al6061 alloy – Multiwall carbon nanotubes reinforced composites by powder metallurgy route

Al6061 alloy reinforced multiwall carbon nanotubes composites is manufactured by powder metallurgy process. Microstructure of samples is investigated using scanning electron microscope to check the distribution of carbon nanotubes in aluminium alloy. Micro hardness, impact strength and ultimate tensile strength of Al6061 alloy and Al6061 alloy - multiwall carbon nano tubes composites are examined. Micrograph of composites shows better dispersion of multiwall carbon nanotubes in Al6061 alloy. Addition of multiwall carbon nanotubes improved the hardness, impact strength and ultimate tensile strength of matrix. Hardness of Al6061 increased up to 18.6% by reinforcing 1.5 wt% of multiwall carbon nanotubes in Al6061 alloy. Impact strength and ultimate tensile strength increased up to 66.6and 11.93% respectively by adding 1.5 wt% of reinforcements in Al6061 alloy. 1.5 wt% of multiwall carbon nanotubes in aluminium 6061 alloy offered better mechanical properties compared to Al6061 alloy and 1.5 wt% reinforced Al6061 composites.

Vertically-Aligned Multi-Walled Carbon Nano Tube Pillars with Various Diameters under Compression: Pristine and NbTiN Coated.

In this paper, the compressive stress of pristine and coated vertically-aligned (VA) multi-walled (MW) carbon nanotube (CNT) pillars were investigated using flat-punch nano-indentation. VA-MWCNT pillars of various diameters (30–150 µm) grown by low-pressure chemical vapor deposition on silicon wafer. A conformal brittle coating of niobium-titanium-nitride with high superconductivity temperature was deposited on the VA-MWCNT pillars using atomic layer deposition. The coating together with the pillars could form a superconductive vertical interconnect. The indentation tests showed foam-like behavior of pristine CNTs and ceramic-like fracture of conformal coated CNTs. The compressive strength and the elastic modulus for pristine CNTs could be divided into three regimes of linear elastic, oscillatory plateau, and exponential densification. The elastic modulus of pristine CNTs increased for a smaller pillar diameter. The response of the coated VA-MWCNTs depended on the diffusion depth of the coating in the pillar and their elastic modulus increased with pillar diameter due to the higher sidewall area. Tuning the material properties by conformal coating on various diameter pillars enhanced the mechanical performance and the vertical interconnect access (via) reliability. The results could be useful for quantum computing applications that require high-density superconducting vertical interconnects and reliable operation at reduced temperatures.

Enhanced Functional Properties of Low-Density Polyethylene Nanocomposites Containing Hybrid Fillers of Multi-Walled Carbon Nanotubes and Nano Carbon Black.

In this work, hybrid filler systems consisting of multi-walled carbon nanotubes (MWCNTs) and nano carbon black (nCB) were incorporated by melt mixing in low-density polyethylene (LDPE). To hybrid systems a mixture of MWCNTs and nCB a mass ratio of 1:1 and 3:1 were used. The purpose was to study if the synergistic effects can be achieved on tensile strength and electrical and thermal conductivity. The dispersion state of carbon nanofillers in the LDPE matrix has been evaluated with scanning electron microscopy. The melting and crystallization behavior of all nanocomposites was not significantly influenced by the nanofillers. It was found that the embedding of both types of carbon nanofillers into the LDPE matrix caused an increase in the value of Young’s modulus. The results of electrical and thermal conductivity were compared to LDPE nanocomposites containing only nCB or only MWCNTs presented in earlier work LDPE/MWCNTs. It was no synergistic effects of nCB in multi-walled CNTs and nCB hybrid nanocomposites regarding mechanical properties, electrical and thermal conductivity, and MWCNTs dispersion. Since LDPE/MWCNTs nanocomposites exhibit higher electrical conductivity than LDPE/MWCNTs + nCB or LDPE/nCB nanocomposites at the same nanofiller loading (wt.%), it confirms our earlier study that MWCNTs are a more efficient conductive nanofiller. The presence of MWCNTs and their concentration in hybrid nanocomposites was mainly responsible for the improvement of their thermal conductivity.

PREDICTION OF TENSILE STRENGTH BEHAVIOR OF AA2024 REINFORCED WITH CNT IN THE COMBINATION OF FSW+FSP

Friction stir welding (FSW) is a solid-state welding procedure that is fast becoming the standard within the manufacturing industry. It is a process that can produce welds of utmost quality and durability in hard-to-weld materials such as alloys of Aluminum and Copper. It has potential applications in some of the most demanding and varied industries, such as aerospace, the military, robotics as well as trains, and ever computer hardware. FSW also has the extraordinary advantages of being one of the very few fabricators that can weld a wide range of materials with sufficient strength at an economical cost. These welds also offer an unmatched, environmentally harmless solution to tackle these problems faced by the traditional and outdated industry. Friction stir processing (FSP) is on the FastTrack to becoming the industry’s most dependable and widely used methods of fabrication. Over the past 10-15 years many researchers have subsequently studied this process and made various changes and alterations in the material used for reinforcement as well as the quantity of material used. FSP also has the added precedence of severely decreasing distortion and also defects in materials. FSP was combined with FSW due to its ability to achieve a better Ultimate Tensile Strength (UTS) and superior hardness in the weld area. This process has been used time and again to weld Aluminum alloys because of its superior and less distorted welds with excellent HAZ properties. The Aluminum 2024 base metal plate was successfully conjoined using the reinforcement material: Multi-Walled Carbon Nano Tubes(MWCNT). During the Tensile tests, the strength was found to be around 476 MPa, without FSW or FSP. After FSW, the optimum joining strength was found to be about 780 MPa, signaling an increase in the strength of the plates. The optimized values for CNT, rotation speed, feed rate, and tilt angle were found to be 2mm depth of the groove, 900 RPM, 60 mm/min, and 1-degree tilt angle.

Mechanical and durability characteristics of multiwalled carbon nano tube in concrete

Concrete is the widely used reliable constructions material worldwide in the field of Civil Engineering with various reforms using advanced Technology. One of the encroachments is the Nano science and it has also played a remarkable role in the field of material science. Eventually Nano materials were used in the concrete to intervene new material at Nano scale and thereby increasing the Mechanical, Chemical and durability property. Various Nano materials are being used in civil Engineering, off all those Nano materials used in the concrete are Nano silica, Multi walled Carbon Nano tubes, and Nano Titanium oxide. These Nano materials are used in producing High performance concrete which exhibits tremendous strength and durability of concrete. The material that is used in this research paper is Carbon Nano tubes. The multiwalled carbon Nano tubes exhibits exceptionally high Mechanical Property and also act as a reinforcing material for the high performance concrete. These multiwall carbon Nano tubes are effectively incorporated in concrete by ultrasonic method and using surfactant. There are interfacial interactions between carbon nanotubes and the hydrations of cement, which enhances a high bonding strength between the reinforcement and cement matrix. Mutiwalled carbon nanotubes are various ratio is incorporated with the concrete of mix proportion M40 grade of concrete. Their mechanical property is thereby compared with the nominal concrete mix. In this research the fine aggregate is also partially to fully replace by manufactured sand as the demand for the river sand is high, an alternate is sought. Besides the mechanical property and the complex reinforcement of cement matrix, the Nano concrete exhibits early strain capacity which shows a considerable improvement in the long term durability of the concrete.

Influence of Mwcnt’s/Zinc Oxide Nano Particles/Epoxy Resin Composite Coating on Mild Steel to Enhance Anticorrosion and Mechanical Properties

The motive of this research is to develop a new hybrid Nano composite on the surface of mild steel to eradicate the rate of corrosion that takes place on the surface of the mild steel and to enhance mechanical properties. For this, a hybrid Nano composite of Multi-Walled Carbon Nano Tube’s (MWCNT’s), Zinc Oxide (ZnO) Nano particles and Epoxy resin has been used to overcome the major disadvantage of mild steel which is corrosion. The mechanical property of mild steel is also increased. Ultra-sonication method is adopted for better dispersion of ZnO Nano particles and MWCNT’s. In this study, Ethanol is used for better dispersion. After applying the coating on the surface of newly developed Nano composite by using pneumatic gun spray method is used. FESEM was conducted to study the surface morphology of corroded surface of mild steel. The rate of anticorrosion and mechanical properties get improved by the application MWCNT’s/ZO Nano particles/Epoxy resin.

Relationship between water Cement Ratio and Characteristic Properties of Multi Walled Carbon Nano Tube Reinforced Concrete

In this study effect of water-cement ratio (W/C) on the characteristic properties of multiwalled carbon nano tube reinforced concrete is analyzed. Five concrete mixtures of different water-cement ratio (W/C) with and without carbon nano tubes (CNTs) were prepared. W/C of 0.40, 0.45, 0.48, 0.50 and 0.55 were used while quantity of carbon nano tube (CNT) was fixed at 1% by weight of cement (wbc). Ratio of cement, sand and aggregates was also fixed at 1: 1.76:2.66 in all mixes. For maintaining workability 0.5% polycarboxlate based superplasticizer wbc was added in all mixes.. The workability of carbon nanotube reinforced concrete (CNTC) reduced by 60% and W/C=0.50 was found ideal for slump as well as strength. At this W/C compressive strength for CNTC increased by 7.20%, split tensile strength increased by 25.75% and flexural strength increased by 3.87%.