Symmetric supercapacitor: Sulphurized graphene and ionic liquid

Shaikh, Jasmin S.,Shaikh, Navajsharif S.,Kharade, Rohini,Beknalkar, Sonali A.,Patil, Jyoti V.,Suryawanshi, Mahesh P.,Kanjanaboos, Pongsakorn,Hong, Chang Kook,Kim, Jin Hyeok,Patil, Pramod S. Elsevier 2018 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.527 No.-

<P><B>Abstract</B></P> <P>Symmetric supercapacitor is advanced over simple supercapacitor device due to their stability over a large potential window and high energy density. Graphene is a desired candidate for supercapacitor application since it has a high surface area, good electronic conductivity and high electro chemical stability. There is a pragmatic use of ionic liquid electrolyte for supercapacitor due to its stability over a large potential window, good ionic conductivity and eco-friendly nature. For high performance supercapacitor, the interaction between ionic liquid electrolyte and graphene are crucial for better charge transportation. In respect of this, a three-dimensional (3D) nanoporous honeycomb shaped sulfur embedded graphene (S-graphene) has been synthesized by simple chemical method. Here, the fabrication of high performance symmetric supercapacitor is done by using S-graphene as an electrode and [BMIM-PF<SUB>6</SUB>] as an electrolyte. The particular architecture of S-graphene benefited to reduce the ion diffusion resistance, providing the large surface area for charge transportation and efficient charge storage. The S-graphene and ionic liquid-based symmetric supercapacitor device showed the large potential window of 3.2 V with high energy density 124 Wh kg<SUP>−1</SUP> at 0.2 A g<SUP>−1</SUP> constant applied current density. Furthermore, this device shows good cycling performance (stability) with a capacitive retention of 95% over 20,000 cycles at a higher current density of 2 A g<SUP>−1</SUP>.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Frequency of Chromosomal Abnormalities in Pakistani Adults with Acute Lymphoblastic Leukemia

Shaikh, Muhammad Shariq,Adil, Salman Naseem,Shaikh, Mohammad Usman,Khurshid, Mohammad Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.21

Background: The difference in prognosis of adult and childhood acute lymphoblastic leukemia (ALL) can be attributed largely to variation in cytogenetic abnormalities with age groups. Cytogenetic analysis in acute leukemia is now routinely used to assist patient management, particularly in terms of diagnosis, disease monitoring, prognosis and risk stratification. Knowing about cytogenetic profile at the time of diagnosis is important in order to take critical decisions in management of the patients. Aim and Objectives: To determine the frequency of cytogenetic abnormalities in Pakistani adult patients with ALL in order to have insights regarding behavior of the disease. Materials and Methods: A retrospective analysis of all the cases of ALL (${\geq}15$years old) diagnosed at Aga Khan University from January 2006 to June 2014 was performed. Phenotype (B/T lineage) was confirmed in all cases by flow cytometry. Cytogenetic analysis was made for all cases using the trypsin-Giemsa banding technique. Karyotypes were interpreted using the International System for Human Cytogenetic Nomenclature (ISCN) criteria. Results: A total of 166 patients were diagnosed as ALL during the study period, of which 151 samples successfully yielded metaphase chromosomes. The male to female ratio was 3.4:1. The majority (n=120, 72.3%) had a B-cell phenotype. A normal karyotype was present in 51% (n=77) of the cases whereas 49% (n=74) had an abnormal karyotype. Of the abnormal cases, 10% showed Philadelphia chromosome; t(9;22)(q34;q11.2). Other poor prognostic cytogenetic subgroups were t(4;11)(q21;q23), hypodiploidy (35-45 chromosomes) and complex karyotype. Hyperdiploidy (47-57 chromosomes) occurred in 6.6%; all of whom were younger than 30 years. Conclusions: This study showed a relatively low prevalence of Philadelphia chromosome in Pakistani adults with ALL with an increase in frequency with age (p=0.003). The cumulative prevalence of Philadelphianegative poor cytogenetic aberrations in different age groups was not significant (p=0.6).

Security Completeness Problem in Wireless Sensor Networks

Shaikh, Riaz Ahmed,Lee, Sungyoung,Albeshri, Aiiad AUTOSOFT PRESS 2015 INTELLIGENT AUTOMATION AND SOFT COMPUTING Vol.21 No.2

<P>With the emergence of wireless sensor networks and its usage in sensitive monitoring and tracking applications, the need of ensuring complete security is gaining more importance than ever before. Complete security can only be ensured by adding privacy, cryptographic-based security and trust management aspects in a security solution. However, integration of all these three aspects in a single solution for resource constraints wireless sensor networks is not trivial. Current research intensively focuses on all these three aspects in an isolated manner. To the best of our knowledge, we have not found any work in the literature that comprehensively discusses: how these various privacy, security and trust solutions work together? In this work, we have made the first step towards this direction and to show how integration of various privacy, security and trust solutions can be performed in a single solution in step-by-step manner.</P>

Advances in Materials Technology for Electronic Modules

Shaikh, Aziz 한국마이크로전자및패키징학회 1994 Seminar on Hybrid Microelectronics and Multichip P Vol.1 No.1

Mass scale sugar-mediated green synthesis and DSSCs application of tin oxide nanostructured photoanode: Effect of zinc sulphide layering on charge collection efficiency

Shaikh, S.F.,Mane, R.S.,Joo, O.S. Pergamon Press 2014 ELECTROCHIMICA ACTA Vol.147 No.-

Table-top (market quality) sugar-mediated green synthesis of tin oxide (SnO<SUB>2</SUB>) spherical nanocrystallites (NCs) of 40-60nm is reported, passivated with 2, 4 and 6 layers (L) of zinc sulphide (ZnS) and envisaged in dye sensitized solar cells (DSSCs). All photoanodes i.e. without and ZnS-passivated SnO<SUB>2</SUB> (SnO<SUB>2</SUB>-ZnS NCs) are characterized for their structure, morphology, optoelectrochemical properties. SnO<SUB>2</SUB>-ZnS NC-electrodes show appreciable DSSCs performance due to an enhanced dye loading capability, light scattering ability, and suppressed recombination rate. The optimized SnO<SUB>2</SUB>-(4L) ZnS NC-photoanode demonstrates 200% enhancement in the power conversion efficiency compared to SnO<SUB>2</SUB> NC-based photoanode. This is due to prolonged transient photovoltage decay and higher charge recombination resistance with a minimized recombination rate of photoelectrons. Mott-Schottky measurements confirm a negative shift in the conduction band position of SnO<SUB>2</SUB>-(4L) ZnS NCs photoanode (0.41V) compared to SnO<SUB>2</SUB> NC-photoanode.

ON THE EXISTENCE OF SOME TYPES OF LP-SASAKIAN MANIFOLDS

Shaikh, Absos A.,Baishya, Kanak K.,Eyasmin, Sabina Korean Mathematical Society 2008 대한수학회논문집 Vol.23 No.1

The object of the present paper is to provide the existence of LP-Sasakian manifolds with $\eta$-recurrent, $\eta$-parallel, $\phi$-recurrent, $\phi$-parallel Ricci tensor with several non-trivial examples. Also generalized Ricci recurrent LP-Sasakian manifolds are studied with the existence of various examples.

Effect of micro-silica on mechanical and durability properties of high volume fly ash recycled aggregate concretes (HVFA-RAC)

Shaikh, Faiz,Kerai, Sachin,Kerai, Shailesh Techno-Press 2015 Advances in concrete construction Vol.3 No.4

This paper presents the effect of different micro-silica (MS) contents of 5, 10 and 15 wt.% as partial replacement of cement on mechanical and durability properties of high volume fly ash - recycled aggregate concretes (HVFA-RAC) containing 50% class F fly ash (FA) and 35% recycled coarse aggregate (RCA) as partial replacement of cement and natural coarse aggregate (NCA), respectively. The measured mechanical and durability properties are compressive strength, indirect tensile strength, elastic modulus, drying shrinkage, water sorptivity and chloride permeability. The effects of different curing ages of 7, 28, 56 and 91 days on above properties are also considered in this study. The results show that the addition of MS up to 10% improved the early age (7 days) strength properties of HVFA-RAC, however, at later ages (e.g. 28-91 days) the above mechanical properties are improved for all MS contents. The 5% MS exhibited the best performance among all MS contents for all mechanical properties of HVFA-RAC. In the case of measured durability properties, mix results are obtained, where 10% and 5% MS exhibited the lowest sorptivity and drying shrinkage, respectively at all ages. However, in the case of chloride ion permeability a decreasing trend is observed with increase in MS contents and curing ages. Strong correlations of indirect tensile strength and modulus of elasticity with square root of compressive strength are also observed in HVFA-RAC. Nevertheless, it is established in this study that MS contributes to the sustainability of HVFA-RAC significantly by improving the mechanical and durability properties of concrete containing 50%less cement and 35% less natural coarse aggregates.

Analytical and computational analysis of pressure at the nose of a 2D wedge in high speed flow

Shaikh, Javed S.,Kumar, Krishna,Pathan, Khizar A.,Khan, Sher A. Techno-Press 2022 Advances in aircraft and spacecraft science Vol.9 No.2

Supersonic projectiles like rockets, missiles, or aircraft find various applications in the field of defense. The shape of the wings is mainly designed as wedge shape or delta wings for supersonic vehicles. The study of supersonic flows over the wedges and flat plate delta wings around the large scale of incidence angle is considered in the supersonic projectile. In the present paper, the prime attention is to study the pressure at the nose of the plane wedge over the various Mach number and the various angles of incidence. Ghosh piston theory is used to obtain the pressure distribution analytically, and the results are compared with CFD analysis results. The wedge angle and Mach number are the parameters considered for the research work. The range of wedge angle is 50 to 250, and Mach number is 1.5 to 4.0 are considered for the current research work. The analytical results show excellent agreement with the CFD results. The results show that both the parameters wedge angle and Mach number are influential parameters to vary the static pressure. The static pressure increases with an increase in Mach number and wedge angle.

Monoclinic WO₃ nanorods–rutile TiO₂ nanoparticles core–shell interface for efficient DSSCs

Shaikh, ShoyebMohamad F.,Kalanur, Shankara S.,Mane, Rajaram S.,Joo, Oh-Shim The Royal Society of Chemistry 2013 Dalton transactions Vol.42 No.28

<P>A core–shell photoanode, composed of a monoclinic WO<SUB>3</SUB> nanorods core encapsulated with a rutile TiO<SUB>2</SUB> nanoparticles shell, reveals ∼246% enhancement in power conversion efficiency due to improved current density and open circuit voltage values and longer-lived charge carriers.</P> <P>Graphic Abstract</P><P>A core–shell photoanode, composed of a monoclinic WO<SUB>3</SUB> nanorods core encapsulated with a rutile TiO<SUB>2</SUB> nanoparticles shell, reveals nearly 246% enhancement in power conversion efficiency due to improved current density and open circuit voltage values, and longer-lived charge carriers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3dt50728a'> </P>

Electrochemical supercapacitors of electrodeposited PANI/H-RuO₂ hybrid nanostructure

Shaikh, S.F.,Lim, J.Y.,Joo, O.S. Elsevier 2013 Current Applied Physics Vol.13 No.4

Electrodeposited mixed nanostructures composed of conducting polyaniline (PANI) and hydrous ruthenium oxide (H-RuO<SUB>2</SUB>) referred as a hybrid nanostructure was synthesized. The surface morphology was investigated from the field-emission scanning electron microscopy digital photoimages. Fibrous network of PANI and spheres of H-RuO<SUB>2</SUB> were obtained. PANI embedded H-RuO<SUB>2</SUB> was confirmed from the Raman spectroscopy analysis. Cyclic-voltammetry, used to characterize the electrochemical capacitive properties of hybrid PANI/H-RuO<SUB>2</SUB> (RP 30) nanostructure, showed a specific capacitance as high as 322 F/g in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. The electrochemical impedance spectroscopy measurement revealed the low equivalent series resistance.