Comparison of sodium zirconium phosphate and Synroc matrices for immobilization of high-level waste

The aims of the present work were to investigate possible compatibility between sodium zirconium phosphate (NZP) and Synroc titanate phases, to prepare NZP-based waste forms by hot-pressing rather than sintering, and to investigate the incorporation in NZP of (a) Cs/Sr as simulated heat-generating nuclides; (b) simulated actinides; and (c) simulated Purex waste. The NZP samples were prepared by methods similar to those used for Synroc. The precursor NZP phase was formed from tetrabutyl zirconate Zr(OC{sub 4}H{sub 9}){sub 4}, sodium nitrate, and 85% orthophosphoric acid. Simulated waste nitrate solutions were then mixed with the liquid precursor. After stir drying of the precursor, calcination was carried out at 700{degree}C to remove nitrates and organics

Synthesis, Structural Elucidation and Bioassay of Morpholine/Thiomorpholine and Piperidine Containing Oxazoles

The series of novel oxazole derivatives (3-4) have been synthesized. All the entitles compounds were characterized by IR, 1H, 13C NMR, mass spectra. All the lead compounds were tested for antimicrobial activity. The compound 4f having chloro substituent on the aromatic ring displays greater antimicrobial activity particularly against P. aeruginosa and P. crysogenum. © 2020 Author(s).The authors G. Sravya and N. Bakkthavatchala Reddy are thankful to Ural Federal University, Yekaterinburg, Russia for giving postdoctoral fellowship

Synthesis of a New Class of Thiazolyl Morpholines / Thiomorpholines and Evaluation as Antimicrobials

The series of novel thiazole derivatives (4-5) have been synthesized. All the synthesized compounds were characterized by IR, 1H, 13C NMR, mass spectra. All the lead compounds were tested for antimicrobial activity. The compound 5f having chloro substituent on the aromatic ring displays greater antimicrobial activity particularly against P. aeruginosa and P. crysogenum. © 2020 Author(s).The authors G. Sravya and N. Bakkthavatchala Reddy are thankful to Ural Federal University, Yekaterinburg, Russia for giving postdoctoral fellowship

Investigation on Synthesis, Structural and Optical Properties of CDS Nanoparticles

Hexagonal wurtzite structured CdS nanoparticles were synthesized by using a chemical precipitation method. Various spectroscopic technics were used for the characterization of the prepared sample. The X-ray diffraction pattern shows the high intense crystalline peaks and the average crystallite size is found to be 19nm. FT-IR spectrum exhibited a metal sulfide band at 615cm-1 and other functional groups. SEM micrographs reveal the non-uniformly distributed spherical shaped structures. EDS analysis confirms the stoichiometric composition and presence of target elements. The optical absorption spectrum exhibited a broad peak at 510nm, which indicates the shifting of the absorption rage of CdS nanoparticles into the visible region. PL spectrum exhibited the characteristic emission bands in visible region. © 2020 Author(s).One of the authors Dr. G. Thirumala Rao would like to thank the GMR Institute of Technology, Rajam for providing financial support to carry out the research work. Authors would also like to thank the Department of Physics, Acharya Nagarjuna University, Guntur

Meglumine Sulphate: an Efficient Catalyst for the Synthesis of bis(indolyl)methanes

The reaction of indoles with carbonyl compounds in the presence of 5mol% Meglumine Sulphate (MS) in acetonitrile was executed to synthesize bis(indolyl)methane derivatives using conventional and ultrasonication methods. The reaction proceeded in shorter reaction time in ultrasonication methodology leading to high yield of the products. © 2020 Author(s)

Synthesis of Heteroaryl Urea Derivatives as Antimicrobial Agents

Azoles are prominent scaffolds in the pharmaceutical arena. In fact, medicinal properties of azole and benzazole containing compounds include anticancer, antimicrobial and antioxidant. Some of the drugs Inthomycin C, Oxaprozin, Tiazofurin, Dacarbazine, Tipifarnib, Albendazole, Febendazole, Omeprazole possess azole/benzazole moiety. Realizing the importance of azoles and benzazoles, it is planned to conjugate these two ligands as heteroaryl substituted urea derivatives and to study their antimicrobial activity. The results pertaining to these aspects will be discussed. © 2020 Author(s).The authors K. Narendra Babu and V. Padmavathi are grateful to CSIR (Council of Scientific and Industrial Research), New Delhi for financial assistance under major research project

Luminescence Studies on Pr3+& Yb3+ Doped Cadmium Calcium Pyrophosphate Nanophosphors

The Cadmium Calcium Pyrophosphate doped with Pr3+ and Yb3+ was prepared by solution combustion synthesis. The luminescence studies and chromatic properties of the prepared sample were examined in the present study. The luminescence spectra of CdCaP: Pr3+ shows relevant peaks with emission at 599nm upon excitation of 445nm, whereas CdCaP: Yb3+ shows a peak at 536nm when excited with 254nm. The CIE 1931 chromaticity color coordinates for CdCaP: Pr3+ & CdCaP: Yb3+ were located in orange and greenish-yellow regions respectively. CCT and color purity values of the prepared samples were evaluated using McCam empirical formula and respective equation of color purity. Color Rendering Index (CRI) values of the prepared samples were calculated using the color calculator. © 2020 Author(s).Authors are thankful to UGC-DRS & DST-FIST, New Delhi for financial assistance to the department of physics, Acharya Nagarjuna University. One of the authors, Sk. Munimasthani expresses sincere thanks to UGC for providing financial support through MANF scheme (No. F1-17.1/2017-18/MANF-2017-18-AND-79002) to carry out the research work

A Review on Magnetron Sputter Coatings

To modify the metal/nonmetal surface properties like hardness, wear and corrosion resistance, surface coating technology is the easiest and inexpensive method. Out of various surface coating methods, the sputter coating technique is one of the prominent methods to improve surface properties. Sputter coating techniques are widely used in aerospace, automobile, solar panels, and various engineering fields to improve the surface properties. The present study focused on various materials used in the sputter coating techniques to develop thin films on various components. The influence of coating materials on hardness, wear and corrosion resistance of the various materials like steels, magnesium and their alloys are also explained in detail in this review. © 2020 Author(s)

Structural Properties of Co2+ Ion Doped Calcium Cadmium Phosphate Hydrate Nanophosphor

Inorganic nanophosphor materials have captivated the worldwide attention into the field of solid-state lighting emission displays, plasma display panels, light-emitting diodes, IR quantum counters, scintillation, etc. Nanotechnology is the foremost superior in the development of phosphors with definite size and shape. Alkali and alkaline earth phosphates are promising candidates for the inorganic phosphor materials. Manufacturing of nano-inorganic materials gained much interest due to their advance lighting applications. In this work, novel Co2+ doped Calcium Cadmium Phosphate hydrate nanophosphor (CaCdPH: Co2+) was synthesized by a traditional solid-state reaction technique. The synthesized sample was characterized by Powder XRD, SEM equipped with EDX and FTIR techniques. The hexagonal phase of the prepared CaCdPH: Co2+sample was confirmed by X-ray diffraction results, and the average crystallite size was evaluated. FTIR demonstrated the formation of vibrational modes ascribed to phosphate molecules and other hydroxyl groups. The morphologies of the CaCdPH: Co2+ nanophosphor was investigated by scanning electron microscopy. © 2020 Author(s).One of the authors, T. Rajyalakshmi is thankful to JNTU Kakinada, DIC for financial assistance in the MHRD project. Authors express their special thanks to UGC-DRS, DST-FIST - New Delhi for providing financial assistance to the Dept. of Physics, Acharya Nagarjuna University. And also acknowledge the service render by scientific officers of Kerala University and Yogi Vemana University for their help providing XRD and SEM instruments for sample recordings