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RISS 인기검색어
- 검색키워드
- 저자 : Suman Lal (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Synthesis, characterization and dielectric investigation of ZnO-doped polyaniline nanocomposites
Suman Lal,Surya Kant Tripathi,Rajesh Kumar,Nitin Sood,Samriti Khosla 한국정보디스플레이학회 2015 Journal of information display Vol.16 No.1
Polyaniline (PANI) synthesized through the in situ polymerization method and its composites with zinc oxide nanoparticles loaded in various weight percentages were studied. The formation of PANI and its composites was characterized using different characterizing tools, and detailed analysis was done to investigate the structural and morphological properties of the composites. The presence of the vibration band of the metal oxide and other characteristic bands of the composites, as characterized via Fourier transmission infrared spectroscopy, confirmed the synthesis of the polymer nanocomposites. The X-ray diffraction patterns of the nanocomposites revealed their polycrystalline nature. The dielectric responses of PANI and the ZnO-doped PANI composites were investigated within the frequency range of 20 Hz to 1 MHz. The dielectric constant of the ZnO-doped PANI composite was found to be higher than that of the pure PANI. The value of the dielectric constant decreased with increasing frequency, and it became constant at higher frequencies, which is attributed to the interfacialpolarization.
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Impact of the concentration of multiwall carbon nanotubes on polyaniline
Suman Lal,S.K. Tripathi,Nitin Sood,Samriti Khosla 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.3
In this paper, pure polyaniline (PANI) and its composites were synthesized with different concentrations of multiwall carbonnanotubes (MWCNTs), and their formation was characterized using different characterizing tools. The XRD pattern andscanning electron microscope images showed a homogeneous coating of the PANI on the MWCNTs, which indicated thedispersion of the carbon nanotubes into a polymer matrix. The Fourier transform infrared confirmed the interaction betweenthe MWCNTs and the PANI through a quinoid ring, which caused the PANI chains to be adsorbed on the surface of theMWCNT and formed a tubular core surrounded by MWCNTs. The UV spectroscopy data accounted for the lower opticalband gap of the PANI/MWCNT composites. The electrical transport properties of the different PANI/MWCNT compositeswere investigated using two-probe method techniques, which showed that the conductivity of the PANI/MWCNTcompositesincreased with increases in the concentration of the MWCNTs and the temperature. This enhancement in conductivity wasexplained on the basis of the band gap and charge transfer effect.
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Study of the optical, thermal, and mechanical properties of nematic liquid crystal elastomers
Santosh A. Mania,Sameer U. Hadkar,P. J. Jessy,Suman Lal,Patrick Keller,Samriti Khosla,Nitin Sood,Pradip Sarawade 한국정보디스플레이학회 2016 Journal of information display Vol.17 No.4
In the present study, the optical, thermal, and mechanical properties of liquid crystal elastomers (LCEs) were investigated using various techniques. The presence of functional groups in LCE was studied using Fourier transform infrared spectroscopy. The phase transition temperatures were confirmed via polarizing optical microscopy and Fabry–Perot scattering studies. The differential thermal analysis was used for investigating the thermal behavior. A dynamic mechanical analysis was used to study the mechanical properties of LCE. The significant mechanical changes with a considerable reversible effect were observed for this soft material. The changes in the mechanical shape with the temperature are attributed to the change in the phase of the LCE material.
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