Shiva Prasad

Deakin University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Valderí Duarte Leite

Universidade Estadual da Paraíba

Renato Alexandre Costa de Santana

Universidade Federal de Campina Grande

Girish Chandra

Indian Institute of Technology Delhi

S.N. Shringi

Indian Institute of Technology Mandi

Ana Regina Nascimento Campos

Universidade Federal de Campina Grande

R. Krishnan

Centre National de la Recherche Scientifique

A. K. Nigam

Tata Institute of Fundamental Research

Wilton Silva Lopes

Universidade Estadual da Paraíba

Aldre Jorge Morais Barros

Universidade Federal de Campina Grande

G. Rajaram

University of Hyderabad

Cooperative Institutions

Universidade Federal da Paraíba

Universidade Federal de Campina Grande

Universidade Estadual da Paraíba

Indian Institute of Technology Bombay

Universidade Federal do Rio Grande do Norte

Centre National de la Recherche Scientifique

Universidade Federal do Pará

Universidade Federal de São Carlos

Departamento de Ciência e Tecnologia

Universidade de São Paulo

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Electrometric investigations on the formation of cerium(III) tungstates as a function of pH

Eclética Química (2000)

Shiva Prasad André Luiz Fiquene de Brito Ana Cristina Silva Muniz Valderí Duarte Leite

The course of reaction between cerium(III) nitrate and different sodium tungstates (Na2WO4, Na10W12O41 and Na6W12O39) has been followed by means of pH and conductometric titrations between the reactants at different pH levels, in aqueous and alcoholic media, with each of the reagents alternatively used as titrant. The electrometric experiments provide definite evidence of the formation of normal-Ce2O3.3WO3 and para- 5Ce2O3.36WO3 tungstates of cerium in the vicinity of pH 6.2 and 5.3. The formation of normal tungstate is almost quantitative and the pH titrations offer a simple means for determination of cerium(III) or tungstate solutions at suitable concentrations and pH range.

Tungstate

Sodium tungstate

Cerium nitrate

10.26850/1678-4618eqj.v25.1.2000.p77-87

Cite

Citations (0)

Formation of antimonites and thioantimonites of cobalt as a function of pH

Eclética Química (1995)

Shiva Prasad

10.26850/1678-4618eqj.v20.1.1995.p35-47

Cite

Citations (1)

Change in resistivity behavior induced by Er in amorphous Co80-xErxB20 alloys

Solid State Communications (1990)

Nirupama Sharma A. K. Nigam Girish Chandra Shiva Prasad S.N. Shringi

Temperature coefficient

Atmospheric temperature range

10.1016/0038-1098(90)90955-b

Cite

Citations (3)

Temperature dependence of longitudinal magnetoresistance in amorphous FeCrSiB alloys

Materials Science and Engineering (1988)

Girish Chandra A. K. Nigam V. Srinivas Shiva Prasad S.N. Shringi

10.1016/0025-5416(88)90324-2

Cite

Citations (3)

Inhomogeneities and FMR spectra in some D.C. sputtered amorphous Gd-Co films

Journal of Applied Physics (1979)

Shiva Prasad R. Krishnan G. Suran J. Sztern H. Jouve

FMR technique has been shown to be capable of detecting chemical inhomogeneities present in some amorphous GdCo films. A group of bulk modes observed when the polarizing field is perpendicular to the film plane, have been shown to correspond to absorption from regions which differ slightly in their magnetization and hence in their relative Gd or Co concentration. Such inhomogeneities seem to increase with the bias voltage. A typical result shows that Gd concentration variation is in the range 1–2 at.% and which is beyond any chemical analysis used currently. These inhomogeneities increase with the bias voltage and are distributed, as it were, in the whole volume of the film in a random manner as shown by acid etching experiments. Vacuum annealing at T up to 290°C does not lead to any homogenization and argon anneal leads to a new situation with a very large in plane anisotropy besides a spin wave spectra now appears in all the samples.

Biasing

Film plane

10.1063/1.327270

Cite

Citations (18)

Biogenically engineered silver nanoparticles using bael leaf extract and evaluation of its therapeutic potential

Materials Technology (2021)

Amballa Chaitanyakumar Kanti Kusum Yadav Levin Anbu Gomez Prathap Somu Saarumathi Senthoor

The current study aims to explore the antimicrobial and anticancer activity of biogenic silver nanoparticles (B-AgNPs) synthesized using Bael leaf extract. AgNPs nanoparticles characterized using FESEM, TEM, XRD, and UV-Spectrophotometry. TEM analysis revealed that B-AgNPs were predominantly spheroidal with particle size distribution in the range of 7-10 nm. In MTT assay, when B-AgNPs were applied in colon cancer (HCT-116) cells and human colon epithelial cell line (FHC) cells. B-AgNPs exhibited specific cytotoxicity to HCT-116 as minimal effect observed in normal FHC cells. Moreover, the fluorescence microscopic examination after nucleus staining as well as DNA fragmentation also confirmed AgNPs spectific cytotoxicity towards HCT-116. Further, AgNPs demonstrated excellent antibiofilm and antibacterial activity in both Gram-Positive and Gram-negative bacteria. Hence, overall, we categorically concluded that the biogenic silver nanoparticles synthesized using Bael leaf extract possess multiple biological activities and might be possibly used as multipurpose therapeutic material with no or little systemic toxicity.

Silver nanoparticle

MTT assay

10.1080/10667857.2021.1965701

Cite

Citations (8)

Optimization of operational parameters and bath control for electrodeposion of Ni-Mo-B amorphous alloys

Journal of the Brazilian Chemical Society (2002)

Fabiano A. Marinho François Sandini Marques De Santana André L. S. Vasconcelos Renato Alexandre Costa de Santana Shiva Prasad

Optimization of operational parameters of an electrodeposition process for deposition of boron-containing amorphous metallic layer of nickel-molybdenum alloy onto a cathode from an electrolytic bath having nickel sulfate, sodium molybdate, boron phosphate, sodium citrate, sodium-1-dodecylsulfate and ammonia for pH adjustments to 9.5 has been studied. Detailed studies of the efects on bath temperature, mechanical agitation, cathode current density and anode format have led to optimum operational conditions for obtaining satisfactory alloy deposits. The highest cathode current efficiency for deposition of the alloy was about 69% for cylindrical and 64% for rectangular platinum anode while working at bath temperature 80ºC, cathode rotation 15 rpm and cathode current density 100 mA cm-2. A voltammetric method for automatic monitoring and control of the process was proposed.

Deposition

Sodium sulfate

10.1590/s0103-50532002000400018

Cite

Citations (15)

The process of biosorption of heavy metals in bioreactors loaded with sanitary sewage sludge

Brazilian Journal of Chemical Engineering (2006)

Aldre Jorge Morais Barros Shiva Prasad Valderí Duarte Leite Antônio G. Souza

This work on the process of biosorption of nickel and chromium in an ascendant continuous-flow, fixed packed-bed bioreactor of sanitary sewage sludge was conducted in a search for solutions to the environmental problem caused by heavy metals. Analysis of the results demonstrated that the absorbent had an extraordinary capacity for biosorption of the heavy metals studied at about 9.0 pH of the effluent, with a removal percentage of over 90.0% for the two metals. Chemometric study results demonstrated that 20 days of the experimental system function were sufficient for achieving the maximum efficiency of sorption of the heavy metals studied by the sanitary sewage sludge employed.

Biosorption

Sewage sludge

10.1590/s0104-66322006000200001

Cite

Citations (31)

Efeito da densidade de corrente e pH na obtenção da liga Ni-Fe por eletrodeposição

Matéria (Rio de Janeiro) (2017)

José Anderson Machado Oliveira Anamélia de Medeiros Dantas Raulino José Leonardo Costa Raulino Ana Regina Nascimento Campos Shiva Prasad

RESUMO Revestimentos metálicos podem ser aplicados para diferentes finalidades, como exemplo, para melhorar as propriedades mecânicas, catalíticas, anticorrosivas ou simplesmente melhorar o aspecto decorativo. Neste trabalho foram obtidas ligas de Ni-Fe pelo processo de eletrodeposição utilizando um banho eletrolítico simples contendo os seguintes reagentes, sulfato de níquel, sulfato de ferro e tartarato de sódio. Como ferramenta de otimização foi utilizado um planejamento experimental completo 22, associado à técnica de metodologia de superfície de resposta (MSR). Foram feitas medidas de composição química, eficiência de corrente, morfologia superficial e medidas eletroquímicas de corrosão. Foi observado que a diminuição do pH favoreceu o aumento do ferro e diminuição do níquel na liga. O teor de ferro influenciou na morfologia da liga. O experimento ótimo apresentou uma resistência à corrosão média de 5471,5 Ω.cm² e uma densidade de corrente de corrosão média de 4,814x10-6 A/cm², este experimento apresentou uma composição percentual em massa de níquel de 70 wt% e de ferro de 30 wt% e uma eficiência de corrente média de 58,7%.

10.1590/s1517-707620170001.0105

Cite

Citations (3)

Studies on electrodeposition and corrosion behaviour of a Ni–W–Co amorphous alloy

Journal of Materials Science (2007)

Renato Alexandre Costa de Santana Ana Regina Nascimento Campos Eduardo Alexandrino Medeiros Aldrighi Luiz M. Oliveira Liana Maria F. Silva

10.1007/s10853-007-1931-0

Cite

Citations (55)