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RISS 인기검색어
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- 저자 : Basivi, Praveen Kumar (검색결과 3 건)
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Basivi, Praveen Kumar,Pasupuleti, Visweswara Rao,Seella, Ramanaiah,Tukiakula, Madhusudana Reddy,Kalluru, Subramanyam Reddy,Park, Soo-Jin American Chemical Society 2017 Journal of chemical and engineering data Vol.62 No.7
<P>The inverse gas chromatography study on the fluconazole drug surface was performed, and the net retention volumes, polar probes, and VN of n-alkanes are determined at four temperatures over the range 318.15-333.15 K. The net retention values of n-alkanes were used to evaluate the London dispersive surface free energy gamma(L)(S) by three different methods, namely, the Donnet Park, Dorris Gray, and Schultz methods. The gamma(L)(S) values were found to increase from 318.15 to 323.15 K for all three methods and then decrease from 323.15 to 333.15 K. The gamma(L)(S) values were found to be slightly higher in the Schultz method when compared to the results of the Donnet-Park and Dorris-Gray methods. The specific free energy values Delta G(a)(s) and the specific enthalpy Delta H-a(s) values have been calculated using the V-N data of polar probes. The Guttmann Lewis acid base parameters, K-a and K-b, were obtained using Delta H-a(s) values and were found to be 0.217 and 1.518, respectively. The surface character (K-b/K-a) was found to be 7.0. The results revealed that the fluconazole powder surface contains relatively more basic sites than acidic sites and can combine strongly with acidic substrates. The surface energy and acid base data of fluconazole can be used during formulation of the drug and to understand the drug release process.</P>
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Sreekanth, T.V.M.,Basivi, Praveen Kumar,Nagajyothi, P.C.,Dillip, G.R.,Shim, J.,Ko, T.J.,Yoo, K. Elsevier 2018 Journal of chromatography Vol.1580 No.-
<P><B>Abstract</B></P> <P>Melamine and thiourea-derived graphitic carbon nitrides (M-GCN/T-GCN) were synthesized and characterized. The surface properties were investigated using inverse gas chromatography (IGC) and compared. Net retention volumes of M-GCN and T-GCN were measured with <I>n</I>-alkanes (C<SUB>5</SUB>–C<SUB>10</SUB>) and polar probes. The London dispersive surface free energies ( γ s d ), calculated using Schultz and Dorris–Gray methods, decreased linearly with increasing temperature. The specific components of the enthalpy and entropy of adsorption for the polar probes were obtained using the Schultz, Dong, and Sawyer–Brookman methods. The Gutmann’s Lewis acid–base parameters, <I>K<SUB>a</SUB> </I> and <I>K<SUB>b</SUB> </I>, were determined using the surface free energy ( Δ G a S ) via these methods. The surface character ‘<I>S’</I> values (<I>K<SUB>b</SUB> </I>/<I>K<SUB>a</SUB> </I>) of M-GCN and T-GCN using the respective methods are 4.04, 3.78, and 5.08 and 4.11, 5.27, and 2.86. Hence, the surfaces contain more basic than acidic sites and could interact strongly with acidic media. Thus, IGC elucidates the surface charges of the GCN matrix resulting from surface chemical modification.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Graphitic carbon nitride was synthesized using two precursors, melamine and thiourea. </LI> <LI> Physicochemical properties were confirmed by XRD, XPS and BET. </LI> <LI> Inverse gas chromatography was employed to understand surface free energy of GCN. </LI> <LI> The London dispersive parameters were determined by Schultz/Dorris–Gray methods. </LI> <LI> The Lewis acid–base parameters, showing the more basic character of GCN. </LI> </UL> </P>
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p-Pheneylendiamine functionalized rGO/Si heterostructure Schottky junction for UV photodetectors
Chandrakalavathi, T.,Reddeppa, Maddaka,Revathi, T.,Basivi, Praveen Kumar,Viswanath, Sujaya Kumar,Murali, G.,Kim, Moon-Deock,Jeyalakshmi, R. Elsevier 2019 Diamond and related materials Vol.93 No.-
<P><B>Abstract</B></P> <P>In this work, we report on p-Phenylenediamine (PPD) functionalized reduced graphene oxide (rGO)/Si hybrid-structure designed for UV photodetector applications (PD). The hybrid-structure was characterized by using Fourier Transform-infrared spectroscopy, X-ray photoelectron spectroscopy to confirm the formation of nano-hybrid structure and the experimental results confirmed the covalent bond between rGO and PPD. The diode parameters such as barrier height, series resistance, and ideality factor were estimated for both PPD functionalized rGO (PrGO)/Si and rGO/Si heterostructure by using I-V characteristics. The time-resolved photocurrent spectroscopy used to examine the photoresponse properties of both PrGO/Si and rGO/Si samples with UV light (λ = 382 nm). The experimental results showed that PrGO/Si exhibited significant UV photoresponse than that of rGO/Si PD. The PrGO/Si heterostructure device exhibited photoresponsivity of 1.4 × 10<SUP>−3</SUP> A/W, which is 15 times higher than rGO/Si. The high photoresponse was attributed to the synergistic effects originated from the charge transfer between PPD and rGO. The results proved that PrGO is a promising material for high response photodetector applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> p-Pheneylendiamine covalently functionalized with rGO. </LI> <LI> PPD-rGO/Si hybrid structure practically applied for photodetector applications. </LI> <LI> The charge transfer between PPD and rGO could be enhanced the photoresponse of hybrid structure. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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