Structural and electrical analysis of nanocomposites of functionalized multiwalled carbon nano-tubes with stannic oxide

Author(s):  
Nirmala Rani ◽  
Neena Jaggi
2020 ◽  
Vol 22 ◽  
pp. 1417-1423
Author(s):  
Sabitha Jannet ◽  
E. Pradeep Kumar Reddy ◽  
R. Raja ◽  
B. Morish Manohar

2014 ◽  
Vol 70 (a1) ◽  
pp. C1178-C1178
Author(s):  
David Billing

During the course of the last couple of years, my collaborators and I have studied a number of catalytic systems using a lab based PXRD facility at our disposal. Of particular interest to us has been the supported catalysts used in Fischer Tropsch catalysis as well as those used in the synthesis of multiwalled carbon nano tubes. These studies have all proven invaluable to the understanding of the often complex phase evolution that is an intricate and inherent part of the heterogeneous processes of interest to us. Selected results will be presented to illustrate the usefulness and value of these studies. For example below is the intensity profile of the diffraction patterns collected during the heat-treatment of the pre-catalyst: A – anatase, R – rutile, S – silicon, H – hematite and P – pseudobrookite


2020 ◽  
Vol 12 ◽  
Author(s):  
Abhay Kumar Singh ◽  
Tien-Chien Jen

Aims: To address the physical properties of the growing research topic based on inorganic and organic composite materials under the glassy regime. The incorporation of a small amount of organic content in inorganic chalcogenide alloy could be an interesting topic for the investigation. Such composite materials optical and structural properties could define their prospective use. Objectives: Considering prospective utility of the inorganic and organic composite materials this report key goal to demonstrate the structural and optical properties, like, absorption spectra, extinction coefficient (k), real dielectric constant (εʹ), imaginary dielectric constant (εʹʹ), refractive index (n), absorption coefficient (α) and optical energy band (E g ) for the Se 55 Te 25 Ge 20 (GTS) alloy, Se 55 Te 25 Ge 20 +0.025% multiwalled carbon nano tubes (MWCNT) and Se 55 Te 25 Ge 20 +0.025 % bilayer graphene (GF) composites. Methods: To synthesize the materials direct melt-quenched technique was adopted. Materials microstructural and UV/ Visible optical absorption were performed from the Field Emission Scanning Electron Microscope and UV/ Visible optical spectrometer equipment’s. Results: The obtained experimental evidences are revealed that materials optical properties and microstructures slightly altered owing to incorporation of multi walled carbon nano tubes and bilayer graphene in Se 55 Te 25 Ge 20 regime. To correlate the inorganic- organic material interactions a schematic has also interpreted based on the bond formation in the solids. Conclusion: The experimental evidences have revealed the existence of MWCNT and GF in diffused form in GTS glassy configuration. The evidences have also revealed the diffused morphologies of the MWCNT and GF could not developed the specific structure within the complex configuration (although they have exhibited rather distinct morphologies), but they influenced the optical properties of the composite materials.


Polymer ◽  
2018 ◽  
Vol 141 ◽  
pp. 213-220 ◽  
Author(s):  
P. Sinem Omurtag ◽  
Burcu Alkan ◽  
Hakan Durmaz ◽  
Gurkan Hizal ◽  
Umit Tunca

2020 ◽  

<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>


2007 ◽  
Vol 8 (4) ◽  
pp. 292-298 ◽  
Author(s):  
Seok-Min Yun ◽  
Ju-Wan Kim ◽  
Min-Jung Jung ◽  
Young-Chang Nho ◽  
Phil-Hyun Kang ◽  
...  

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%.


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