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Abstract

In this study, a new chemically modified cellulose polymer-capped ZnO nanopowder prepared by hydrothermal method using chemically modified cellulose polymer as capping agent was successfully reported. The structural characteristics of CMC-capped ZnO nanopowder was reported by FTIR, XRD, SEM and EDX studies. XRD results revealed crystallographic properties like crystal composition, phase purity and crystallite size of the prepared CMC-capped ZnO nanopowder and average size calculated by Debye Scherrer formula as 14.66 nm. EDX studies revealed that the presence of elemental compositions of capping agent in the nanopowder samples. The optical characterization of the CMC-capped ZnO nanopowder was studied using UV absorption (λmax = 303 nm) and PL spectroscopy (λex = 295 nm). The average crystal diameter and grain size were calculated by effective mass approximation formula and compared with XRD findings that agreed well and verified CMC capped ZnO with particle size of 193 nm. Thus, the promising optical characteristics shown by the synthesized CMC capped ZnO nanopowders exposes its potential usage in bio-medical fields.
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Authors and Affiliations

R. Jagadeeswari
1
P. Selvakumar
2
ORCID: ORCID
V. Jeevanantham
2
ORCID: ORCID
R. Saravanan
1

  1. Department of Chemistry, KPR Institute of Engineering And Technology, Coimbatore-641407, Tamilnadu, India
  2. Department of Chemistry, Vivekanandha College of Arts And Sciences for Women, Tiruchengode-637205, Tamilnadu, India
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Abstract

The paper presents research results of multilayer systems composed of alternate Cu/Ni layers. The layers thickness obtained by the galvanic treatment was determined by using the transmission electron microscopy and X-ray diffraction method in the grazing incidence diffraction geometry. The surface morphology was observed using scanning electron microscope with EDS microanalysis. Observation of the surface topography of systems using the atomic force microscope was also carried out.

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Authors and Affiliations

M. Spilka
R. Babilas
W. Ratuszek
J. Kowalska
K. Matus
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Abstract

A deep eutectic solvent, ethaline (as a typical representative of new-generation room temperature ionic liquids), was used to anodically treat the surface of copper-nickel alloy (55 wt.% Cu). Anodic treatment in ethaline allows flexibly affecting the patterns of surface morphology: formation of stellated crystallites and surface smoothing (i.e. electropolishing) are observed depending on the applied electrode potential. The measured values of roughness coefficient ( Ra ) well correlate with the changes in surface morphology. Anodic treatment of Cu-Ni alloy in ethaline contributes to a considerable increase in the electrocatalytic activity towards the hydrogen evolution reaction in an alkaline aqueous medium, which can be used to develop new high-efficient and inexpensive electrocatalysts within the framework of the concept of carbon-free hydrogen economy.
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Authors and Affiliations

V. Protsenko
1
ORCID: ORCID
T. Butyrina
1
ORCID: ORCID
D. Makhota
1
ORCID: ORCID
S. Korniy
1 2
ORCID: ORCID
F. Danilov
1
ORCID: ORCID

  1. Ukrainian State University of Chemical Technology, Department of Physical Chemistry, Gagarin Ave., 8, Dnipro, 49005, Ukraine
  2. Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Naukova St. 5, Lviv, 79060, Ukraine

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