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- 저자 : Uttam Kumar Mandal (검색결과 5 건)
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Mandal Prasanta,Mazumder Nilesh,Saha Subhajit,Ghorai Uttam Kumar,Roy Rajarshi,Das Gopes Chandra,Chattopadhyay Kalyan Kumar 한국물리학회 2021 Current Applied Physics Vol.25 No.-
Delafossite compounds are layered ternary oxides known for simultaneous exhibition of significant carrier conduction and optical transparency. To survey effect of simultaneous cationic and anionic hole doping in prototype delafossite CuCrO2, we have analyzed the structural, optical, impedance and transport mechanism of CuCr1 xLixO2 ySy (x and y ranging 0–2 atomic %) prepared by solid state heating. The substitutional site occupancy of Li•• Cr and S×O are confirmed and quantified by Rietveld analysis. Valence band dispersion is demonstrated upon Li•• Cr and S×O co-doping by x-ray photoelectron spectroscopy with extended contribution from shallow S 3p antibonding states. From diffuse reflectance spectra, the optical gap (~3.5 eV) is evaluated to be wide even upon co-doping. Carrier density and hole mobility for CCO/(Li•• Cr +S×O ) to be 5.32 × 1015 cm 3 and 23.50 cm2V 1s 1, respectively. This scheme of band engineering is indicative of a more persuasive alternative to reach the hole conductivity bottleneck threshold.
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Vrinda Goel,Uttam Kumar Mandal 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.4
On the basis of the water-loving nature of Polyaniline (PANI), super hydrophilic polysulfone (PS) ultrafiltration membranes were prepared via in-situ polymerization of aniline on the surface of the membrane. Growing polyaniline in-situ leads to permeability enhancement of the ultrafiltration membrane. Surface-attenuated total reflection Fourier transform infrared spectroscopy, Atomic force microscopy, Scanning electron microscopy and energy dispersive X-spectroscopy and water contact angle demonstrated the successful attachment of PANI on PS membrane surface. Modified membranes containing increased amount of PANI were compared to the unmodified PS membrane to estimate the change in membrane performance, hydrophilicity and anti-fouling properties. PANI modified membranes showed higher water fluxes in comparison to unmodified membranes, while protein rejection was almost similar in both PANI modified and unmodified PS membranes. Atomic force microscopy and contact angle measurements confirmed increased membrane surface hydrophilicity with increasing PANI content. Fouling study and flux recovery experiments revealed that modified membranes exhibit higher flux recovery ratio (65%) and more stability to strong cleaning agents.
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Noor Adiba Md Adib,Uttam Kumar Mandal,Farahidah Mohamed,Bappaditya Chatterjee 한국약제학회 2017 Journal of Pharmaceutical Investigation Vol.47 No.3
A simple, rapid and sensitive gas chromatographic (GC) method with flame ionization detector (FID) has been developed and validated for simultaneous estimation of camphor, menthol and methyl salicylate (MS). Camphor, menthol and MS were separated at about 2.753, 3.206 and 3.995 min respectively on a capillary column with helium (3.3 ml/min) as carrier gas within 11 min run time. Noninterference of any peak with the peaks of interest confirms the selectivity of method. Derived quantitation limits (QL) were 0.847, 0.684 and 6.507 μg/ml for camphor, menthol and MS respectively. The linear relationship ( R2 > 0.999) between analyte concentration vs detector response was established within a range of QL to 150% of label claim concentration for each analyte. Recovery of each analyte at 50, 100 and 150% of label claim concentration levels were obtained within 99.67–101.53% establishing high accuracy of the method. The method showed acceptable precision with low relative standard deviation or RSD (0.24–1.03%) between percent recoveries for each analyte. RSD for intermediate precision (inter day analysis, analyst variation) was less than 1%. The validated method was successfully applied for quantitative determination of camphor, menthol and MS in stability samples of an analgesic ointment produced by IKOP Sdn. Bhd., Malaysia.
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Binayak Sen,Mozammel Mia,G. M. Krolczyk,Uttam Kumar Mandal,Sankar Prasad Mondal 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.1
In modern days, the conception of sustainability has progressively advanced and has begun receiving global interest. Thus, sustainability is an imperative idea in modern research. Considering the recent trend, this review paper presents a summary of the previously published research articles on minimum quantity lubrication (MQL) assisted machining. The requirement to stir towards sustainability motivated the researchers to revise the effects of substitute lubrication methods on the machining. Conventional lubri-cooling agents are still extensively employed when machining of engineering alloys, but the majority of the recent papers have depicted that the utilization of vegetable oil, nanofluids, and nanoplatelets in MQL system confers superior machining performances as compared to conventional lubrication technology. In actual, the definite principle of this manuscript is to re-examine modern advancements in the MQL technique and also explore the benefits of the vegetable oil and nanofluid as a lubricant. In brief, this paper is a testimony to the advancing capabilities of eco-friendly MQL technique which is a viable alternative to the flood lubrication technology, and the outcomes of this review work can be contemplated as a movement towards sustainable machining.
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Gurumurthy Hegde,Yuvaraj Aralapura Rajkumar,Gan Siew Mei,Syed Mahmood,Uttam Kumar Mandal,Achalkumar Ammathnadu Sudhakar 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
Amide linkage was introduced into azo compound at para position and its optical storage properties were investigated. Synthesized compounds showed liquid crystalline behavior when electron withdrawing group was inserted in the chemical structure. UV/Vis study showed that the photoisomerization effect in solution occurred at 18- 24 sec (E-Z) and 5-11 hours (Z-E), whereas in solids it occurred at 30 sec (E-Z) and 5 hours (Z-E). Photoisomerization effect of amide based azodyes in the presence of hydrogen bonding is discussed for the first time. Effect of terminal electronic withdrawing groups on hydrogen bonding is speculated to be the reason behind the surprising behavior. Strong evidence for the structure property relations reported here is useful for applications such as optical storage device in which one can tune the structure according to one’s requirement.
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