02392nas a2200217 4500008004100000022001400041245009600055210006900151260000800220300000900228490000600237520168500243100002201928700001501950700001801965700002301983700001502006700001802021700001602039856011902055 2018 eng d a2045-232200aPreparation of colourless phosphate glass by stabilising higher Fe[II] in microwave heating0 aPreparation of colourless phosphate glass by stabilising higher  cAPR a61950 v83 a

Iron impurity in raw material remains a major challenge in producing colourless glass. In this investigation, we report microwave (MW) heating capable of altering Fe-redox ratio (Fe2+/Sigma Fe) enabling preparation of colourless phosphate glass. The effect of Sn concentration in retention of Fe[II] in glass melted in MW was compared with conventional glasses. Colourimetric study developing Fe2+-ferrozine colour complex reveals Fe-redox ratio >= 0.49 required to obtain colourless phosphate glass. In microwave heating, addition of 1 wt.% Sn metal powder can impart the desired effect whereas addition of 1.9 wt.% Sn metal powder is required in conventional heating. The correlation equation of Fe-redox ratio with concentration of Sn metal is found to be different in microwave and conventional heating. Thus, exploiting this different redox changes in MW heating optical properties can be tailored. Preservation of higher Fe[II] in MW melted glass is also confirmed by XPS and TGA. P-31 MAS NMR spectra suggest that transition from cross linked ultra phosphate to linear polymer metaphosphate network in incorporation of Sn is found different in glass prepared adopting microwave irradiation. (27)A1 MAS NMR spectra suggest higher relative content of Al6+ in glass obtained from MW heating. Energy consumption analysis revels 3.4 kWh in MW heating while 14 kWh in conventional glass melting using resistance heating. Further, glass melting in MW can be completed within 2 h unlike similar to 5 h needed in conventional. MW heating plays a significant role in improving properties to make colourless phosphate glass in addition to significant energy and time saving.

1 aMandal, Ashis, K.1 aMandal, B.1 aIllath, Kavya1 aAjithkumar, T., G.1 aHalder, A.1 aSinha, P., K.1 aSen, Ranjan uhttp://library.ncl.res.in/content/preparation-colourless-phosphate-glass-stabilising-higher-feii-microwave-heating01654nas a2200277 4500008004100000022001400041245015600055210006900211260000900280300001400289490000600303520071700309653001901026653000901045653001101054653002401065653001801089653001901107653002001126100002301146700002001169700002301189700001501212700002401227856012501251 2020 eng d a2574-096200aPhotocatalytic hydrogen generation and CO2 conversion using g-C3N4 decorated dendritic fibrous nanosilica: role of interfaces between silica and g-C3N40 aPhotocatalytic hydrogen generation and CO2 conversion using gC3N cSEP  a8150-81580 v33 a

We have synthesized g-C3N4 decorated over dendritic fibrous nanosilica (DFNS). The generation of C-N-Si interfaces by coating each fiber of DFNS with g-C3N4 not only provided high surface area but also affected the optical and electronic properties of the composite. The catalyst synthesis reproducibility issue of g-C3N4 was resolved using a vacuum-sealed quartz tube. The extended light absorption in the visible region, enhanced lifetime of photogenerated charge carriers due to the formation of interfaces between silica and g-C3N4 (confirmed by solid-state NMR), and increased surface area result in the improved photocatalytic activity of DFNS/g-C(3)N(4)for hydrogen generation and CO2 conversion.

10aCO2 conversion10aDFNS10ag-C3N410aHydrogen generation10ananocatalysts10aphotocatalysts10aSolid-state NMR1 aRawool, Sushma, A.1 aSamanta, Anupam1 aAjithkumar, T., G.1 aKar, Yusuf1 aPolshettiwar, Vivek uhttp://library.ncl.res.in/content/photocatalytic-hydrogen-generation-and-co2-conversion-using-g-c3n4-decorated-dendritic01832nas a2200217 4500008004100000022001400041245012700055210006900182260000900251300001400260490000700274520106100281653000901342653002001351653002701371653001601398653002001414100002701434700002301461856013001484 2025 eng d a1543-838400aProbing the effect of fluorine on hydrogen bonding interactions in a pharmaceutical hydrate using Advanced Solid-State NMR0 aProbing the effect of fluorine on hydrogen bonding interactions  cMAR  a1869-18800 v223 a

Structural studies of pharmaceutical hydrates are essential to understanding stability-related issues, especially during the heating process of formulation. A thorough understanding of the hydration and dehydration behavior of active pharmaceutical ingredient (API) hydrate is also important since phase transitions can occur during the formulation process. This is because dehydration could result in a considerable rearrangement in the structure if water-API hydrogen bonding is present. We perform advanced solid-state NMR experiments on regorafenib monohydrate to investigate the role of fluorine in hydrogen bonding interaction, and the results are compared to its anhydrous form and its structural analogue, namely, sorafenib. Our results show that significant structural changes could not be observed on dehydration. Based on our study, it can be concluded that the introduction of fluorine restricts the intramolecular hydrogen bonding and the asymmetry in the structure of regorafenib monohydrate is absent, in comparison to sorafenib.

10aDQSQ10aHydrogenbonding10apharmaceutical hydrate10aregorafenib10aSolid-state NMR1 aHareendran, Chaithanya1 aAjithkumar, T., G. uhttp://library.ncl.res.in/content/probing-effect-fluorine-hydrogen-bonding-interactions-pharmaceutical-hydrate-using-advanced