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Patil, Santosh S.,Johar, Muhammad Ali,Hassan, Mostafa Afifi,Patil, Deepak R.,Ryu, Sang-Wan Elsevier 2018 Applied Catalysis B Vol.237 No.-
<P><B>Abstract</B></P> <P>Gallium nitride (GaN) is one of the ubiquitously known photoanode for photoelectrochemical water splitting (PEC-WS) due to its tunable band gap and favorable band edge positions. However, the unavoidable surface defects in GaN induces surface Fermi level pinning and surface band bending which severely reduces its PEC conversion efficiency. Constructing heterostructure is the key to approaching better charge separation efficiency and light harvesting ability for PEC-WS. Considering this, we have fabricated ternary heterostructure of GaN/ZnO/MWCNTs photoanode by combining metal organic chemical vapour deposition (MOCVD), hydrothermal and ‘dip and dry’ methods. FE-SEM results showed the formation of 3D hierarchical honeycomb structure of ZnO on GaN thin film surface when MWCNTs are added into hydrothermal reaction. We investigate the advantage of ZnO honeycomb structure in enhancing the solar PEC-WS performance of GaN photoanode. The synergy of incorporating MWCNTs has resulted into improvement in surface morphology, electron transportation and light harvesting capability. The as obtained ternary heterostructure exhibits photocurrent (<I>J</I> <SUB>ph</SUB>) of 3.02 mA/cm<SUP>2</SUP> at 0 V versus Pt electrode under 1-sun light illumination which is about 2.58 times higher than that of pristine GaN photoanodes (<I>J</I> <SUB>ph</SUB> = 1.14 mA/cm<SUP>2</SUP>).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Constructing GaN/ZnO heterostructure enhances charge separation and PEC performance. </LI> <LI> MWCNTs act as structure directing agent and photosensitizer. </LI> <LI> MWCNTs modified porous hierarchical 3D honeycomb ZnO/GaN heterostructures are presented. </LI> <LI> The ternary heterostructure GaN/ZnO/MWCNTs promises unassisted water splitting. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Synthesis of ternary heterostructure GaN/ZnO/MWCNTs with porous 3D hierarchical honeycomb structures has been demonstrated. As fabricated ternary heterostructure GaN/ZnO/MWCNTs photoanode promises unassisted PEC water splitting with enhanced photocurrent density of 3.02 mA/cm<SUP>2</SUP>, approximately ∼2.58 times higher than that of pristine GaN photoanode.</P> <P>[DISPLAY OMISSION]</P>
Structure elucidation of a newly isolated saponin from Clerodendrum serratum (L) Moon
Santosh S. Bhujbal,Rabindra K.Nanda,Ramesh S.Deoda,Dinesh Kumar,Shailesh M. Kewatkar,Laxmikant S.More,Manohar J.Patil 경희대학교 융합한의과학연구소 2010 Oriental Pharmacy and Experimental Medicine Vol.10 No.4
Plant saponins are widely distributed amongst plants and have a wide range of biological properties. Icosahydropicenic acid, C51H80O19 ((4S,6bS)-8a-((4,5-dihydroxy-6-methyl-3-((3R)-3,4,5-trihydroxy-6-methyl-tetrahydro-2H-pyran-2-yloxy)-tetrahydro-2H–pyran–2-yloxy)carbonyl)-2-hydroxy-4, 6a,6b, 11, 14b-pentamethyl-11-(2-methylprop-1-enyl)-3-(3,4,5-trihydroxy-6-(hydroxymethyl) - tetrahydro-2Hpyran-2-yloxy)-1, 2, 3, 4, 4a, 5, 6, 6a, 6b, 7, 8, 8a, 9, 10, 11, 12, 12a, 14, 14a, 14b-icosahydropicene-4-carboxylic acid), a new saponin was first time isolated from the roots of Clerodendrum Serratum (L)Moon (Verbenaceae).The structure elucidation of the compound was carried out by 1H NMR and DART-MS studies.
Graphene-wrapped Ag 3 PO 4 /LaCO 3 OH heterostructures for water purification under visible light
Patil, Santosh S.,Mali, Mukund G.,Roy, Animesh,Tamboli, Mohaseen S.,Deonikar, Virendrakumar G.,Patil, Deepak R.,Kulkarni, Milind V.,Al-Deyab, Salem S.,Yoon, Sam S.,Kolekar, Sanjay S.,Kale, Bharat B. Elsevier 2016 Journal of energy chemistry Vol.25 No.5
<P>We demonstrated a unique synthesis approach of graphene (GR)-wrapped Ag3PO4/LaCO3OH (APO/LCO) heterostructures by an in-situ wet chemical method. FESEM analysis reveals the formation of rhombic dodecahedrons of APO decorated with LCO and later wrapped with GR flakes. Optical studies shows two absorption edges corresponding to the band gap energies of APO (2.41 eV) and LCO (4.1 eV). Considering the absorption edge of the heterostructures in the visible region, the photocatalytic activities of photocatalysts containing different APO/LCO mass ratios were evaluated by the degradation of MB. GR-decorated composite with 20% LCO (APO/LCO20/GR) exhibited the highest photocatalytic activity for MB degradation, with a rate constant, k of 0.541 min(-1). The photocatalytic activity of APO/LCO20/GR more greatly enhanced than those of the individual constituents (APO, LCO, APO/LCO20). The enhanced photocatalytic activity of the heterostructure can be attributed to the co-catalytic effect of LCO as well as intriguing physicochemical properties of GR. To understand the enhanced photocatalytic activity of the heterostructures the photocatalytic reaction mechanism is proposed in detail. The recyclability of the APO/LCO/GR composite photocatalyst is further evaluated by reusing the catalyst in replicate photocatalytic experiments which shows consistent photocatalytic activity thereby confirms the stability and reusability of heterostructure photocatalyst. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.</P>
Enhanced photoelectrocatalytic water oxidation using CoPi modified GaN/MWCNTs composite photoanodes
Patil, Santosh S.,Johar, Muhammad A.,Hassan, Mostafa A.,Patil, Deepak R.,Ryu, Sang-Wan Elsevier 2019 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.178 No.-
<P><B>Abstract</B></P> <P>GaN is promising material for photoelectrochemical (PEC) water oxidation owing to its adjustable band gap and suitable band edge locations, which straddle the H<SUP>+</SUP>/H<SUB>2</SUB> and O<SUB>2</SUB>/H<SUB>2</SUB>O redox conditions. However, due to its wide band gap and unavoidable surface defects, the PEC conversion efficiency of GaN is insufficient to be used for practical applications. To improve the PEC efficiency of GaN, we report fabrication of a cobalt phosphate (CoPi)-modified GaN/multiwall carbon nanotube (MWCNT) composite photoanode through combination of metal organic chemical vapor deposition, dip and dry methods, and electrodeposition. Here, GaN photoanodes with different MWCNT surface coverages were obtained by cost effective ‘dip and dry’ method. Different deposition cycles were performed to prepare a series of samples, which were evaluated for their photoelectrochemical water oxidation. The highest photocurrent density (<I>J</I> <SUB>ph</SUB>) of 2.23 mA/cm<SUP>2</SUP> at (0 V vs. Pt electrode) was achieved in a sample with moderate incorporation of MWCNTs, formed by through three cycles of the dip and dry coating (i.e., GaN/MWCNT 3T). We attribute this result to the MWCNTs facilitating light sensitization. However, excessive MWCNT loading produced a shielding effect, which lowered the photocurrent density, and an undesirable two-plateau photocurrent behavior indicating sluggish reaction kinetics. The maximum photocurrent density <I>J</I> <SUB>ph</SUB> of 2.81 mA/cm<SUP>2</SUP>, (vs. Pt electrode) with solar to hydrogen conversion efficiency 0.91% was achieved for GaN/MWCNTs 3T/CoPi ternary composite photoanode, which was approximately 2.51 and 1.26 times as high as that of bare GaN and GaN/MWCNTs 3T photoanodes.</P> <P><B>Highlights:</B></P> <P> <UL> <LI> Combining GaN with MWCNTs improves the light harvesting capability. </LI> <LI> Large amount of MWCNTs negatively affected PEC performance. </LI> <LI> The GaN/MWCNTs/CoPi composite photoanode promises unassisted water splitting. </LI> <LI> The PEC activity was improved, approximately 2.51 times higher compare to bare GaN. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Structure elucidation of a newly isolated saponin from Clerodendrum serratum (L) Moon
Bhujbal, Santosh S.,K.Nanda, Rabindra,S.Deoda, Ramesh,Kumar, Dinesh,Kewatkar, Shailesh M.,S.More, Laxmikant,J.Patil, Manohar Kyung Hee Oriental Medicine Research Center 2010 Oriental pharmacy and experimental medicine Vol.10 No.4
Plant saponins are widely distributed amongst plants and have a wide range of biological properties. Icosahydropicenic acid, $C_{51}H_{80}O_{19}$ ((4S,6bS)-8a-((4,5-dihydroxy-6-methyl-3-((3R)-3,4,5-trihydroxy-6-methyl-tetrahydro-2H-pyran-2-yloxy)-tetrahydro-2H-pyran-2-yloxy)carbonyl)-2-hydroxy-4, 6a, 6b, 11, 14b-pentamethyl-11-(2-methylprop-1-enyl)-3-(3,4,5-trihydroxy-6-(hydroxymethyl) - tetrahydro-2Hpyran-2-yloxy)-1, 2, 3, 4, 4a, 5, 6, 6a, 6b, 7, 8, 8a, 9, 10, 11, 12, 12a, 14, 14a, 14b-icosahydropicene-4-carboxylic acid), a new saponin was first time isolated from the roots of Clerodendrum Serratum (L) Moon (Verbenaceae). The structure elucidation of the compound was carried out by $^1H$ NMR and DART-MS studies.
Tribikram Pradhan,Santosh S Patil,Pramod Kumar Sethy 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.1
Cloud Computing Is an Important Transition That Makes Change In Service Oriented Computing Technology. With The Widespread Adoption Of Cloud Computing, The Ability To Record And Account For The Usage Of Cloud Resources In A Credible And Verifiable Way Has Become Critical For Cloud Service Providers And Users Alike. The Success of Such A Billing System Depends On Several Factors: The Billing Transactions Must Have Integrity and No Repudiation Capabilities; the Billing Transactions Must Be No Obstructive and Have A Minimal Computation Cost; And the Service Level Agreement (SLA) Monitoring Should Be Provided In A Trusted Manner. Existing Billing Systems Are Limited In Terms Of Security Capabilities or Computational Overhead. This Project Proposes A Secure And Non-Obstructive Billing System Called THEMIS As A Remedy For These Limitations. The System Uses A Novel Concept Of A Cloud Notary Authority For The Supervision Of Billing. The Cloud Notary Authority Generates Mutually Verifiable Binding Information That Can Be Used To Resolve Future Disputes Between A User And A Cloud Service Provider In A Computationally Efficient Way. Even Administrator of A Cloud System Cannot Modify or Falsify the Data.
Photoelectrochemical Characterization of p-type InAlP on GaAs for Solar Water Splitting Application
Mostafa Afifi Hassan,강진호,Santosh S. Patil,Muhammad Ali Johar,류상완,박석인,송진동 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.2
The photoelectrochemical characteristics of p-InAlP grown on GaAs were investigated to exploit the potential of that material future as a photocathode in solar water splitting. The at band potential was measured, and electrochemical impedance spectroscopy was performed to propose an equivalent circuit model and circuit elements tted for charge transport analysis. Low photocatalytic activity was attributed to the band alignment with the water redox level. Since the valence band of InAlP is close to the water oxidation level, it causes inecient hole transport to the counter electrode and the accumulation of holes in the photocathode.
Multiple fibro-osseous lesions of the jaws: A report of a rare case with a literature review
Makkad Ramanpal Singh,Naidu Giridhar S.,Nagi Ravleen,Sagtani Alok,Patil Santosh,Shrivastava Swatantra 대한영상치의학회 2021 Imaging Science in Dentistry Vol.51 No.4
Fibro-osseous lesions are a poorly defined category of conditions affecting the jaws and craniofacial bones, and include developmental lesions, reactive or dysplastic lesions, and neoplasms. Fibrous dysplasia and ossifying fibroma are the 2 main types of fibro-osseous lesions affecting the jaw, and ossifying fibroma is a true benign neoplasm of the bone-forming tissues with several well-recognized variants ranging from innocuous to extensively aggressive lesions. However, multiple simultaneous fibro-osseous lesions of the jaw bones involving all quadrants are exceedingly rare. One such case diagnosed by conventional radiography and computed tomography is discussed here.