02336nas a2200277   4500008004100000022001400041245013100055210006900186260007400255300001400329490000700343520130900350653001801659653001301677653002401690653002101714653001801735100003101753700002701784700002901811700002001840700002401860700002501884700002601909856012301935       2011                        eng d  a1022-976000aPreparation and characterization of magnetic nanoparticles embedded in hydrogels for protein purification and metal extraction0 aPreparation and characterization of magnetic nanoparticles embed  aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcNOV  a2285-22940 v183 a<p>The present work involves the development of hydrogel magnetic nanocomposites for protein purification and heavy metal extraction applications. The magnetic nanoparticles (MNPs) were prepared in situ in poly(acrylamide)-gum acacia (PAM-GA) hydrogels. The formation of magnetic nanoparticles in the hydrogel networks was confirmed by Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). Scanning electron (SEM) microscopy studies revealed the formation of MNPs throughout the hydrogel networks. The average size of MNPs formed in the hydrogel networks was 3-5 nm as determined by transmission electron microscopy (TEM). The thermal properties of the hydrogel magnetic nanocomposites were evaluated by dynamic scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The magnetic properties of the developed hydrogel magnetic nanocomposites were determined by a vibrating sample magnetometer (VSM). The swelling properties of the hydrogel and the hydrogel magnetic nanocomposites were studied in detail. The hydrogel magnetic nanocomposites are utilized for the removal of toxic metal ions such as Co(II), Ni(II), and Cu(II) and for protein purification. The results confirm that the hydrogel magnetic nanocomposites exhibit superior extraction properties to hydrogels.</p>10aBioseparation10aHydrogel10amagnetic properties10aMetal absorption10aNanocomposite1 aNagireddy, Narayana, Reddy1 aYallapu, Murali, Mohan1 aKokkarachedu, Varaprasad1 aSakey, Ravindra1 aKanikireddy, Vimala1 aAlias, Joy, Pattayil1 aKonduru, Mohana, Raju  uhttp://library.ncl.res.in/content/preparation-and-characterization-magnetic-nanoparticles-embedded-hydrogels-protein-002890nas a2200313   4500008004100000022001400041245016200055210006900217260000800286300001400294490000700308520176200315653003302077653002402110653001402134653002502148653001302173653004502186653003402231100003002265700001802295700002002313700002502333700002002358700001802378700002602396700002402422856013002446       2025                        eng d  a1944-824400aHydrogel electrolyte-mediated in situ Zn-anode modification and the Ru-RuO2/NGr-coated cathode for high-performance solid-state rechargeable Zn-air batteries0 aHydrogel electrolytemediated in situ Znanode modification and th  cJAN  a3188-32040 v173 a<p>
	This work aims to deal with the challenges associated with designing complementary bifunctional electrocatalysts and a separator/membrane that enables rechargeable zinc-air batteries (RZABs) with nearly solid-state operability. This solid-state RZAB was accomplished by integrating a bifunctional electrocatalyst based on Ru-RuO2 interface nanoparticles supported on nitrogen-doped (N-doped) graphene (Ru-RuO2/NGr) and a dual-doped poly(acrylic acid) hydrogel (d-PAA) electrolyte soaked in KOH with sodium stannate additive. The catalyst shows enhanced activity and stability toward the two oxygen reactions, i.e., oxygen reduction and evolution reactions (ORR and OER), with a very low potential difference (Delta E) of 0.64 V. The computational insights bring out the electronic factors contributing to the enhanced catalytic activity of Ru-RuO2/NGr based on the charge density difference (CDD) between the interfaces. The disadvantages of the existing solid-state RZABs, such as their limited lifespan brought on by passivation, dendritic growth, corrosion, and shape change, have also been taken into account. The introduction of the stannate additive to the electrolyte induced an in situ Zn-anode modification, which subsequently improved the interfacial stability of the ZABs and, hence, the battery life cycles. The experimental observations reveal that, during the charging process, the Sn nanoparticles enable the homogeneous Zn deposition on the surface of the anode. Thus, the in situ Zn-anode surface modification assisted in achieving a high-rate cycle capability, viz., the homemade catalyst-based system exhibited continuous charge-discharge cycles for 20 h at a current density of 2.0 mA cm-2, with each cycle lasting for 5 min.</p>
10aBifunctional Electrocatalyst10aCore-ShellStructure10aDFT study10aelectrolyte additive10aHydrogel10asolid-state rechargeable zinc-airbattery10aX-ray absorption spectroscopy1 aKharabe, Geeta, Pandurang1 aVerma, Tushar1 aBarik, Sidharth1 aUrkude, Rajashri, R.1 aAyasha, Nadeema1 aGhosh, Biplab1 aKrishnamurty, Sailaja1 aKurungot, Sreekumar  uhttp://library.ncl.res.in/content/hydrogel-electrolyte-mediated-situ-zn-anode-modification-and-ru-ruo2ngr-coated-cathode-high