Vol. 7 & Issue 3 ; Section C : Physical Sciences

Date : May 2017 to July 2017

 

Surface Active Properties of Some Bioactive Azole Series Complexes of Copper in Binary Solvent Mixture

Nisha Jain and Neha Mathur

JCBPS; Section C; May 2017 – July, 2017, Vol. 7, No. 3; 401-411.

[DOI: https:/doi.org/10.24214/jcbps.C.7.3.40111]

 

  • Abstract

    The importance of colloidal surfactants containing nitrogen and sulphur donor ligands in applied areas of research and many industrial processes cannot be under estimated. Colloido chemical behavior of complexes derived from copper (II) palmitate with substituted phenylthiourea and substituted 2-amino Benzothiazole in benzene-propanol mixture of varying composition has been investigated by viscometric measurement. The combination is found to posses fungicidal, insecticidal, pesticidal and nematocidal activities. The azole and azine ring compounds are very good pharmacological agents and can be used as antimalarial, antimotion sickness, antihistaminic and analgesic. The combination of copper soap and ligand makes complexes which are highly biodegradable and play important role in biological activities. The interaction of these N donor ligands with metal ion gives complexes of different geometries and literature survey reveals that these complexes are potentially more biologically active. Complexes of copper (II) palmitate with N-donor ligands were synthesized and characterized by their elemental analysis, metal weight, m.pt, IR and NMR spectral studies. Copper soaps due to their surface active properties play a vital role in various fields. Complexes containing copper palmitate show remarkable applications in industries and are used as emulsifiers, foaming and wetting agents and dispersing agents. In the present work benzene and propanol have been chosen as the cosolvent as mixed solvents have tendency to interact with complex molecules and affect the aggregation of complex molecules.

Synthesis and characterization of CuS nanocomposites by using alumina channel-technique

J.Maji  and K.Maji 

JCBPS; Section C; May 2017 – July 2017, Vol. 7, No. 3; 412-418,

[DOI: https://doi.org/10.24214/jcbps.C.7.3.41218]

 

  • Abstract

    CuS nanocomposites synthesized using Alumina crystallite as the medium. A core shell nanostructure developed by suitable oxidation of the composite. X ray diffraction (XRD) of synthesized CuS nanocomposites revealed the presence of two crystal structures: one is tetragonal and the other is monoclinic. All salient diffraction peaks can be closely matched to the monoclinic and tetragonal structures. The PL spectrum of the CuS nanopartic;les shows a peak centered at 410nm and 460 nm which is shorter than submicron CuS , indicating a CuS nanocrystals obtain in this work in quantum size. Materials exhibited good electrical and optical properties. Due to high dielectric constant and photo luminescence property this CuS nanocomposites can be used in different electronic and optical devices.

A theoretical study of electron transport through a quantum wire (QW) with a side quantum dots (QD’s) array and quantum point contacts (QPCs) and evaluation of conductance as a function of Fermi energy

MD. Faisal Hussain, Davendra Prasad and L. K. Mishra

JCBPS; Section C; May 2017 – July 2017, Vol. 7, No. 3; 419-430.

[DOI: https://doi.org/10.24214/jcbps.C.7.3.41930]

 

  • Abstract

    Using the theoretical formalism of P. A. Orellana et al. (Phys. Rev B67, 085321 (2003)), we have theoretically evaluated the conductance in the unit of (2e2/h) as a function of Fermi energy in the unit of Γ for N=1 to N=10 QD”s array. Our theoretically evaluated results indicate that as N increases the system develops an oscillating band. One observes N anti-resonances and N-1 resonance which arises due to hybridization of the quasi bound levels of QD’s and the coupling of the QW. This study also reveals an important fact that electron-electron interaction in this system is more effective. The main effect of this interaction is to shift and split the resonance position. Using the theoretical formalism of P. Havu etal [Phys. Rev. B70, 233308(2004)], we have also studied electron transport through QW and quantum point contacts. We observed that conductance of different length of QW as a function of gate voltage increases. This formalism is based on Density Functional Theory and Green’s function technique. Our theoretically evaluated results are in good agreement with the experimental data and also with other theoretical workers. 

Concatenated and CSS quantum codes over ℤ₂

SEDDIK Sanaa

JCBPS; Section C; May 2017 – July 2017, Vol. 7, No. 3; 431-439.

[DOI: 10.24214/jcbps.C.7.3.43139]

  • Abstract

    The development of methods to effectively maintain the properties of single quantum states during the execution of quantum information processing tasks is one of the biggest challenges for quantum information science. We discuss the concept of generalized concatenated quantum codes. This generalized concatenation method provides a systematic way to build good quantum codes.

A theoretical evaluation of magnetoresitance (magnetotransport property) of some heavy-fermion
superconductors

Rishikesh, P. K. Verma and L. K. Mishra

JCBPS; Section C; May 2017 – July 2017, Vol. 7, No. 3; 440-451,

[DOI: 10.24214/jcbps.C.7.3.44051]

  • Abstract

    Using the theoretical formalism of Y. Nakajima etal.[arXiv:0804.2624v2[cond-mat.str-el] 18 Apr 2008], we have evaluated magnetoresistance (MR) of CeIrIn5 (TC=0.4K) heavy-fermion superconductor. Our theoretical results indicate that MR displays T-and H dependence that strongly violates the Kohler’s rule. We then examined the validity of the modified Kohler’s rule. We observed that MR well obeys the modified Kohler’s rule indicating a scaling by the Hall angle  tan2 Θ. Using the theoretical formalism of Y. Nakajima etal [9 May, 2003], we have evaluated MR for HF superconductor CeCoIn5 (TC=2.3K). Our theoretical results indicate that MR crosses from negative to positive value. The Hdependence of MR for this SC is different from all other HF-SC’s. The positive MR shows that it is due to cyclotron motion of the electrons whereas the negative MR is due to suppression of spin-flop scattering. Using the theoretical formalism of T. M. Lippman etal[ J.Low. Temp. Phys.(JLTP) (2007)], we have evaluated MR of HF-SC UPt3 (Tc=536mK, TN=5K) along b-axis. The temperature dependence of MR indicates that the resultscan be well described by a polynomial expansion aH+bH2, where a and b are temperature dependent coefficients. The presence of linear term in  MR shows that there is broken inversion symmetry in the system. Our theoretical analysis of MR of these three HF-SC’s indicate that the normal state exhibit a deviation from conventional Fermi-liquid behaviour. It is well described either by non-Fermi liquid behaviour or antiferromagnetic spin fluctuation or AF correlations. Our theoretically evaluated results are in good agreement with other theoretical workers.

The Propagation of Spin Coherent States

SEDDIK Sanaa

JCBPS; Section C; May 2017 – July 2017, Vol. 7, No. 3; 552-563,

[DOI:10.24214/jcbps.C.7.3.55263]

  • Abstract

    We derive the semi-classical propagation of spin coherent states in complex phase space. We construct a path integral representation for the propagator of such systems and find the appropriate classical trajectories. As special cases we consider two independent systems.

New method for determination of cadmium in Brine water samples via cloud point extraction prior to FAAS using modifying agents

Nadhum A.N. Awaad and Bassam A. R. AL Abdul Aziz

JCBPS; Section D; May 2017 – July, 2017, Vol. 7, No. 3; 578-587.

[DOI: 10.24214/jcbps.D.7.3.57887]

  • Abstract

    Cloud point extraction (CPE) was developed for the separation and pre concentration of trace amounts of cadmium. Flame atomic absorption spectrometry (FAAS) is combined with (CPE) for determine trace amounts of cadmium in brine water. The method is depended on the formation of the hydrophobic complex between Cd ions and sodium diethyldithiocarbamate (DDTC) followed by its extraction into a Triton X-114 using surfactant. The parameters such as pH of sample, concentrations of DDTC and Triton X-114, equilibrium temperature, and equilibrium time, which affect both complexation and extraction, are optimized. Under the selected optimum conditions, and use of magnesium nitrate as matrix modifying agents enable us to develop the direct method for determination cadmium in brine water. The accuracy of the method was better than (3.494) % while the detection limit was found to be (0.841 μg/l) for preconcentration of 1 ml of sample for the determination of Cadmium ions is obtained.

A Theoretical Evaluation of Magneto-Transport Properties like Electrical Resistivity, Hall Resistivity,
Hall Coefficient and Hall Angle of Some Heavy- Fermion Superconductors

Rishikesh , P.K. Verma  and L.K. Mishra 

JCBPS; Section C; May 2017 – July 2017, Vol. 7, No. 3; 564-580.

[DOI: 10.24214/jcbps.C.7.3.56480]

  • Abstract

    In this paper, we have theoretically evaluated magneto-transport properties like temperature ependent electrical resistivity ρxx , temperature dependent Hall resistivityρ xy , temperature dependent Hall coefficient RH and Hall angle ΘH for some heavy-fermion superconductors. The evaluation is performed by taking the theoretical formalism of Y. Nakajima et al [arXiv:cond-mat/0607527v1[cond-mat.str-el] 31 July 2006], Y. Nakajima et al[arxiv:0804.2624v2] [cond-mat.str-el] 18 Apr 2008] and T. Muramatisc et al [J. Phys. Soc. Jpn., Vol 70, 3362 (2001)]. Our theoretically evaluated results of magneto-transport properties of HF SC show non-Fermi liquid behaviour below TCoh (TCoh corresponds to Fermi temperature of f-electrons). This non-Fermi liquid behaviour includes T-dependence of resistivity, large enhancement of Hall coefficient at low T and Hall angle cotΘH  varies with T2. Our theoretically evaluated results are in good agreement with other theoretical workers. We observed that these magnetotransport anomalies are common feature of HF SC CeIrIn5, CeCoIn5, CeRhIn5 and high TC-cup rates. We also observed that these are the universal feature of strongly correlated electron system in the presence of strong AF fluctuations. Our studies will be quite useful for the understanding of heavy fermion systems with high TC cup rates.