Composites comprising of metallic nanoparticles in polymer matrices have allured significant importance due to multifunctionalities. Here a simple protocol has been described to embed Ni nanoparticles in carboxymethyl guar gum (CMGG) polymer. The composite formation helps in the stabilization of Ni nanoparticles which are otherwise prone towards aerial oxidation. Further the nanoparticles retain their superparamagnetic nature and catalytic capacity. Ni-Polymer composite catalyses the reduction of 4-Nitrophenol to 4-Aminophenol very efficiently in presence of NaBH 4 , attaining a complete conversion under some experimental conditions. Ni-Polymer composite is well characterized using UV–vis spectroscopy, FTIR, XPS, powder XRD, TGA, SEM and TEM. A detailed magnetic measurement using superconducting quantum interference device-vibrating sample magnetometer (SQUID-VSM) reveals superparamagnetic behaviour of the composite. © 2017 Elsevier B.V.

SUDIPTA BANDYOPADHYAY

Physics

TANUSHREE BALA

Chemistry

D SARDAR

M SENGUPTA

A BORDOLOI

M A AHMED

S K NEOGI

R JAIN

C S GOPINATH

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Applied Surface Science

Ni-Au nanocomposites in the form of hollow spheres with controlled cavity size have been successfully synthesized by the transmetallation reaction between hydrophobized Ni nanoparticles and hydrophobized Au precursors. This can be considered as a fairly unique synthesis strategy that does not require any additional external reductants. The synthesis is carried out in a nonpolar solvent and precise tuning of the cavity size has been achieved only by varying the ratio of the two reacting components. A detailed characterization has been performed via UV-vis spectroscopy, XPS, TEM, EDAX, and SEM. The mechanistic aspect is established from FTIR. SQUID-VSM confirmed the magnificent superparamagnetism of the nanocomposites. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

New Journal of Chemistry

An organic phase transmetallation approach for synthesis of hollow Ni-Au nanocomposites with tunable cavity size

Zn 0.96 Mn 0.04 O samples were synthesized by solid state reaction technique to explore their magnetic behavior. Structural, morphological and magnetic properties of the samples have been found to be modified by 50 MeV Li 3+ ion beam irradiation. The samples exhibit impurity phase and upon irradiation it disappears. Li 3+ ion irradiation has been utilized for increasing solubility limit of Mn in ZnO. Rietveld refinement analysis indicates that substitutional incorporation of Mn in the host lattice increases with irradiation. Grain size decreases with irradiation. Field dependent magnetization (M-H) measurement explicitly indicates ferromagnetic (FM) nature. It has been established from temperature dependent magnetization (M-T) measurement (500 Oe) and ac susceptibility (χ-T) measurement that ferromagnetism in the system seems to be mainly intrinsic; though superparamagnetic Mn nanoparticles also has a minor role. The analysis of M-T data at comparatively high field (5000 Oe) provides an estimation of antiferromagnetic (AFM) exchange, which acts as a reducing agent for observed magnetic moment. The value of saturation magnetization has been increased upon irradiation and is highly correlated with dissolution of impurity phase. Actually structural property has been modified with ion irradiation and this modification may cause some definite positive change in magnetic property of the sample. © 2013 Elsevier B.V. All rights reserved.

Journal of Alloys and Compounds

Structural modification by Li 3+ ion irradiation and intrinsic magnetic properties of un-irradiated and Li 3+ irradiated Zn 0.96 Mn 0.04 O samples

Carboxymethyl guar gum (CMG) was structurally tailored with aqueous-nanosilica sol for controlled transdermal release of diclofenac sodium. Nanosilica was administered in low to moderately high concentration range to synthesize various, novel CMG-silica hybrid nanocomposites. Spectroscopy together with thermogravimetry, morphology, swelling and rheological studies proved that 1 wt% nanosilica content was the best physical formulation. The drug release studies from different hydrogel nanocomposites exhibited slower release than neat CMG. 1 wt% nanosilica loaded hydrogel nanocomposite gave slowest but steady release profile among all other nanocomposites due to its highly viscous nature owing to most compact microstructure. © 2011 Elsevier Ltd. All rights reserved.

Carbohydrate Polymers

Tailoring carboxymethyl guargum hydrogel with nanosilica for sustained transdermal release of diclofenac sodium

Ni 1-xFe xO (x = 0 and 0.03) nanoparticles are synthesized by a chemical route. XRD and TEM measurements confirm phase purity and crystallinity of the nanoparticles. Fe substitution in NiO reduces considerably the average particle size of the nanoparticles. The pristine NiO sample with size 14 nm and Fe-substituted sample having size 7 nm show room temperature ferromagnetism. The pristine NiO having 31 nm size and Fe-substituted sample with size 25 nm are found to be antiferromagnetic. The M-H and M-T behavior of the pristine and Fe-doped samples are explained with a core-shell model with an antiferromagnetic core and a ferromagnetic shell. The disordered spins at the shell give rise to a spin-glass like frozen state below 10 K. The obtained room temperature ferromagnetism in the pristine and Fe-doped NiO has been attributed to particle size effect. © 2012 Elsevier Ltd.

Materials Research Bulletin

Structural and magnetic properties of pristine and Fe-doped NiO nanoparticles synthesized by the co-precipitation method

Polymer

Synthesis of poly(glycidyl methacrylate)–copper nanocomposite beads by in-situ suspension polymerization and deposition method – A comparative study

Experimental investigation on hydrogen storage in polymer based nanocomposite

Multiple functionalities of Ni nanoparticles embedded in carboxymethyl guar gum polymer: catalytic activity and superparamagnetism

Journal	Data powered by TypesetApplied Surface Science
Publisher	Data powered by TypesetElsevier B.V.
ISSN	0169-4332
Open Access	No