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ABSTRACT: The intricacy of the different parameters involved in the hydration dynamics of collagen influences its performance as biomaterials. This work presents the molecular motions of collagen originating from the solvents and locust bean gum (LBG), which reveal the changes in solvation dynamics of the biopolymers affecting the surface as well as interfacial properties. Water, as a probe liquid bound in collagen has been investigated using a combination of thermoporometry, ATR-FTIR, circular dichroic spectroscopy, dielectric spectroscopy and SEM to explore the influence of LBG on collagen with respect to static and dynamic behaviour. The relaxation process of collagen in the frequency range of 0.01 Hz to 105 Hz and thermoporometry results indicate that the interfacial hydration dynamics are dependent on the applied concentration of LBG. This investigation explicitly reflects the rearrangements of the structural water clusters around the charged amino acids of collagen. These results can be employed to redesign the approach towards the development of collagen based biomaterials.
Carbohydrate Polymers 01/2014; 103:250–260.
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ABSTRACT: Nanocrystalline ZnO doped Dy2O3 has been prepared by a simple and efficient technique for exhibiting an enhanced visible light photocatalytic activity. The prepared catalysts were characterized by IR, UV-DRS, XRD, FESEM, EDAX, HRTEM, XPS, AFM and EPR analysis. XRD data showed that the particles were highly crystalline and nanosized. The size of the nanoparticle was 30–56 nm and found to be of mixed morphology. The surface of the catalyst was highly porous and had a surface roughness of 53.28 nm. ZnO was doped on Dy2O3 in various proportions and the best ratio was finalized by the determination of photodegradation efficiency employing a model pollutant for example, ORG under visible light irradiation. 50 mol% ZnO doped Dy2O3 possessed two fold photocatalytic activities than that of pristine ZnO and followed a pseudo-first-order degradation kinetics. The enhanced photocatalytic activity was due to the presence of f shells in the lanthanide oxide crystal lattice which traps the excited electrons further delaying the process of recombination of electron–hole pair. The dye degradation was initiated by the attack of OH radicals formed during the course of reaction and the formation of OH radicals was confirmed by EPR analysis. The 50 mol% ZnO doped Dy2O3 catalyst completely degraded ORG dye molecules in the aqueous phase and these were confirmed by UV–visible spectroscopy, COD and QTOF-Mass analyses.
Applied Catalysis B: Environmental. 01/2014; s 150–151:288–297.
Tetrahedron Letters 01/2014; 55(12):2010–2014.
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