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Aqueous CTAB-Assisted Electrodeposition of Gold Atomic Clusters and Their Oxygen Reduction Electrocatalytic Activity in Acid Solutions
No full textNovel polymeric inhibitor fo corrosion of 575 a um-nium in 2M NaOH solutions
No full textPurpose -The purpose of this paper is to show how to develop inhibition 575 aluminium in 2M NaOH solution.
Design/methodology/approach -The approach is used to measure gravimetric and polarization measurements.
Findings -The results of the paper clearly reveal that the 0.2 M ZnO with 700 ppm polyaniline in N-methyl-2-pyrrolidone solution is found to offer
inhibition up to 71.2 per cent.
Originality/value -The paper deals with the development of newer inhibitor based on polyaniline. Gravimetric and galvanostatic methods were
employed to evaluate inhibition efficiency
NMR studies on the composition of PVdF-HFP membrane for Li batteries
No full textIn the field of lithium batteries, poly(vinylide
fluoride-co-hexafluoropropylene) polymer finds extensive
applications as membrane, in which the composition of
polymer is very crucial for the optimum performance of the
cell. In this report, nuclear magnetic resonance (NMR)
study as an investigation tool has been carried out to
understand the role of polymer content in the range of 10%
to 30%. Also by using NMR line-width data, some clues
have been drawn on the optimum polymer composition,
which is in good agreement with other studies based on
conductivity data
Electrocatalytic activity of BasoliteTM F300 metal-organic-framework structures
No full textFor the case of the commercially available metal-organic framework (MOF) structure BasoliteTM F300 or Fe
(BTC) with BTC = benzene-1,3,5-tricarboxylate, it is shown that the Fe(III/II) electrochemistry is dominated
by reductive dissolution rather than ion insertion (which in marked contrast is dominating the behaviour of
Fe(III/II) open framework processes in Prussian blues). Solid Fe(BTC) immobilised onto graphite or platinum
working electrodes is investigated and it is shown that well-defined and reversible Fe(III/II) reduction
responses occur only on platinum and in the presence of aqueous acid. The process is shown to follow a CEtype
mechanism involving liberation of Fe(III) in acidic media, in particular for high concentrations of acid.
Effective electrocatalysis for the oxidation of hydroxide to O2 (anodic water splitting) is observed in alkaline
aqueous media after initial cycling of the potential into the reduction potential zone. A mechanism based on
a MOF-surface confined hydrous iron oxide film is proposed
Structure, current efficiency, and corrosion properties of brush electrodeposited (BED) Cr from Cr(III)dimethyl formamide (DMF)-bath
No full textChromium electrodeposited from Cr(III)dimethyl
formamide-bath was studied using brush electrodeposition
(BED) technique. The effects of current density
and plating time on thickness and current efficiency were
studied. An advantage of BED Cr was to produce selective
area deposition on a suitable substrate. Chromium deposits
were characterized using XRD, SEM, and AFM. From the
electrochemical studies, BED Cr have higher charge
transfer resistance Rct and very low Icorr than that of mild
steel substrate
Structural, optical, electrical and morphological properties of ZnTe films deposited by electron beam evaporation
No full textZnTe films were deposited on glass substrates
at different substrate temperatures in the range 30–300 �C.
The thickness of the films was about 200 nm. The films
exhibited cubic structure with preferential orientation in the
(111) direction. Band gap values in the range 2.34–2.26 eV
are observed with increase of the substrate temperature.
The refractive index values are in the range of 2.55–2.92
for the films deposited at different substrate temperatures.
It is observed that the conductivity increases continuously
with temperature. Laser Raman studies indicated the
presence of peaks at 206.9 and 412.2 cm-1corresponding
to the first order and second order LO phonon
Reverse-loop impedance profile in Bi2S3 quantum dots
No full textBismuth sulfide quantum dots (∼12 nm) with two-dimensional platelet morphology synthesized
using a simple aqueous colloidal method exhibit directional growth along 211 direction. Impedance
characteristics of this two-dimensional quantum structure yields a characteristic semi-circular profile
due to a classical Voigt element in addition to a semi-circle like loop in the negative imaginary
part of the impedance Nyquist plot. The apparent inductive reverse-loop impedance profile
observed, a distinguishing feature of this study can be explained on the basis of an unusual negative
resistor–capacitor combination, realized due to relaxation of surface states in this technologically
important semiconductor–quantum structure
Rapid synthesis of room temperature ferromagnetic Ag-doped LaMnO3 perovskite phases by the solution combustion method
No full textWe report the rapid solution combustion synthesis and characterization of Ag-substituted LaMnO3 phases
at relatively low temperature using oxalyl dihydrazide, as fuel. Structural parameters were refined by the
Rietveld method using powder X-ray diffraction data. While the parent LaMnO3 crystallizes in the
orthorhombic structure, the Ag-substituted compounds crystallize in the rhombohedral symmetry. On
increasing Ag-content, unit cell volume and Mn–O–Mn bond angle decreases. The Fourier transform infra
red spectrumshows two absorption bands corresponding toMn–Ostretching vibration (ns mode) and Mn–
O–Mn deformation vibration (nb mode) around 600 cm-1 and 400 cm-1 for the compositions, x = 0.0, 0.05
and 0.10, respectively. Electrical resistivity measurements reveal that composition-controlled metal to
insulator transition, with the maximum metal to insulator being 280 K for the composition
La0.75Ag0.25MnO3. Increase in magnetic moment was observed with increase in Ag-content. The maximum
magnetic moment of 35 emu/g was observed for the composition La0.80Ag0.20MnO3
Convenient electrochemical method for the synthesis of a-bromo alkyl aryl ketones
No full textAn electrochemical procedure for the effective a-bromination of alkyl aryl ketones in
excellent yield has been reported. The simple experimental procedure, catalyst-free conversion,
and excellent yield of monobrominated products are the advantages of this method
Electroless silver deposition on ABS plastic using Co(II) as reducing agent
No full textAn unconventional way of plating Ag by electroless means is by using the oxidation process of
Co(II) to Co(III) in an ammonia complex to reduce the ionic Ag to metal. The present work deals
with electroless Ag deposition on acrylonitrile butadiene styrene (ABS) plastic. Detailed studies on
the effect of bath constituents, bath operating conditions and addition agents on the deposition
rate, quality of the Ag deposit and crystalline nature of the deposit on ABS plastic discs were
carried out and the results discussed