02393nas a2200217 4500008004100000022001400041245009600055210006900151260000800220300000900228490000600237520168500243100002201928700001501950700001801965700002301983700001502006700001802021700001602039856012002055 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 uhttps://library.ncl.res.in/content/preparation-colourless-phosphate-glass-stabilising-higher-feii-microwave-heating16135nas a2200313 45000080041000000220014000412450111000552100069001662600009002353000011002444900008002555201507500263653003115338653005615369653002515425653001915450100001915469700002315488700001915511700001715530700001815547700002215565700001815587700002315605700001815628700002315646700002015669856013215689 2020 eng d a0925-838800aElucidating the effect of CaF 2 on structure, biocompatibility and antibacterial properties of S53P4 glass0 aElucidating the effect of CaF 2 on structure biocompatibility an cAUG  a1547040 v8313 a

The present work focuses on the synthesis and structural elucidation of fluoride containing bioactive glasses in the system (in mol%) given by (53.86) SiO2 – (22.65) Na2O – (21.77-x) CaO – (1.72) P2O5 – x CaF2, where, x = 0, 5.44, 10.885 and 16.33. The role of the incorporated fluoride and its distribution within the glass were interpreted and analyzed using Molecular dynamics (MD) simulations and the results were compared with the modified random network (MRN) model. The interpretations from the model have been verified using the MAS-NMR spectroscopy technique. According to this model, fluoride containing bioactive glasses have been proposed to consist of silicate rich network regions and modifier cation – fluoride rich inter-network regions. The interface region was found to consist of non-bridging oxygen species (NBO) and phosphate cations which are either isolated orthophosphates (Q0P) or bridged with silicates in the form of pyrophosphate (Q1P) units forming Si–O–P bonds. The gradual substitution of CaF2 for CaO in the base glass resulted in an increase in the silicate network connectivity with a reduction in the NBOs and lead to an increase in the association of modifier cations with fluoride ions. However, fluoride ions were found to show a marginal preference to associate with Na+ cations leading to a decrease in the association of Na+ ions with orthophosphate and silicate units. These overall structural findings were correlated with the in vitro ion dissolution behaviour of the bioactive glasses as well as with the thermal properties. The glasses were tested for their in vitro cell viability towards mouse osteoblast type (MC3T3) cells in which fluoride containing bioactive glasses did not show any toxicity and exhibited better cell proliferation. The antibacterial efficacy of the fluoride containing glasses was tested at various concentrations (5, 10 and 20 mg/ml) in E.coli bacterial inoculum in which bactericidal action was evidenced.

10aFluoride bioactive glasses10aIn vitro apatite formation and bactericidal action10aMAS-NMR spectroscopy10aMD simulations1 aPrasad, Sakthi1 aGanisetti, Sudheer1 aJana, Anuradha1 aKant, Shashi1 aSinha, P., K.1 aTripathy, Sucheta1 aIllath, Kavya1 aAjithkumar, T., G.1 aAnnapurna, K.1 aAllu, Amarnath, R.1 aBiswas, Kaushik uhttps://library.ncl.res.in/content/elucidating-effect-caf-2-structure-biocompatibility-and-antibacterial-properties-s53p4-glass00890nas a2200253 4500008004100000022001400041245013400055210006900189260000800258300001100266490000800277100001900285700002300304700001900327700001700346700001800363700002200381700001800403700002300421700001800444700002300462700002000485856013100505 2021 eng d a0925-838800aElucidating the effect of CaF2 on structure, biocompatibility and antibacterial properties of S53P4 glass (vol 831, 154704, 2020)0 aElucidating the effect of CaF2 on structure biocompatibility and cNOV a1612530 v8831 aPrasad, Sakthi1 aGanisetti, Sudheer1 aJana, Anuradha1 aKant, Shashi1 aSinha, P., K.1 aTripathy, Sucheta1 aIllath, Kavya1 aAjithkumar, T., G.1 aAnnapurna, K.1 aAllu, Amarnath, R.1 aBiswas, Kaushik uhttps://library.ncl.res.in/content/elucidating-effect-caf2-structure-biocompatibility-and-antibacterial-properties-s53p4-glass