Electrospinning Preparation and Properties of Tb(phen)L3/PMMA Rare Earth Luminescent Fibers

2014 ◽  
Vol 618 ◽  
pp. 94-99 ◽  
Author(s):  
Fu Lai Zhao ◽  
Li Gao ◽  
Chao Hua Wang ◽  
Peng Xi
Keyword(s):  
Rare Earth ◽  
Methyl Methacrylate ◽  
Ethyl Acetate ◽  
Uniform Distribution ◽  
Applied Voltage ◽  
Feed Rate ◽  
Dimethyl Formamide ◽  
Fluorescent Properties ◽  
Glazed Surface ◽  
Fluorescent Spectra

nanomicron fiber of Tb (phen)L3/poly (methyl methacrylate) (PMMA) was successfully prepared by electrospinning using ethyl acetate (EA) and N,N-dimethyl-formamide (DMF) as the solvent. The influence of collector distance, feed rate, applied voltage and the proportion of EA/DMF on the morphology of the as-prepared fibers were discussed. Based on the researched results, the nanomicron fibers with glazed surface and uniform distribution were prepared. The fluorescent spectra indicate that the nanomicron fibers have good fluorescent properties.

scholarly journals Layered terbium hydroxides for simultaneous drug delivery and imaging

2021 ◽  
Author(s):  
Margarita Strimaite ◽  
Clarissa Harman ◽  
Huan Duan ◽  
Yuwei Wang ◽  
Gemma-Louise Davies ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Rare Earth ◽  
Fluorescent Properties

Layered rare-earth hydroxides have begun to gather increasing attention as potential theranostic platforms owing to their extensive intercalation chemistry combined with magnetic and fluorescent properties. In this work, the potential...

Synthesis, Spectral Characterization and Luminescent Properties of Ternary Rare Earth Nitrates Complexes with 2-Acetylpyridine-tris(2-aminoethyl)amine and Pyridine-N-oxide Ligand

2011 ◽  
Vol 322 ◽  
pp. 337-340
Author(s):  
Lian Cai Du
Keyword(s):  
Thermal Analysis ◽  
Rare Earth ◽  
Luminescent Properties ◽  
Ternary Complexes ◽  
Molar Conductivity ◽  
Lanthanide Ions ◽  
Fluorescent Properties ◽  
Tripodal Ligand ◽  
Rare Earth Nitrates ◽  
The Eu

A tripodal ligand, 2-acetylpyridine-tris(2-aminoethyl)amine (L), pyridine-N-oxide and their ternary complexes with rare earth nitrates have been synthesized. These new complexes with the general formula of Ln·L·PyNO·(NO3)3·nH2O (where Ln = La, Nd, Tb, Pr, Eu, n = 1~3 ) were characterized by elemental analysis, IR spectra, thermal analysis and molar conductivity. All the complexes are stable in air. The results show that the lanthanide ions in each complex are coordinated by nitrogen atoms of the ligand, oxygen atoms of PyNO and the nitrates. The fluorescent properties of the Eu(III) and Tb(III) complexes in solid were investigated.

Solvent Assisted Coaxial-Electrospun Poly Methyl Methacrylate Polymer and Study of Resultant Fibers

2020 ◽  
Vol 18 (12) ◽  
pp. 905-909
Author(s):  
Arjun Satheesh ◽  
A. A. Alagiriswamy ◽  
S. Devanand ◽  
S. Nithiyanantham
Keyword(s):  
Methyl Methacrylate ◽  
Sem Analysis ◽  
Fiber Formation ◽  
Dimethyl Formamide ◽  
Poly Methyl Methacrylate ◽  
The Core ◽  
Pure Solvent ◽  
Core Solution ◽  
Polymer Dispersions

Electrospinning of dispersions with higher viscosity and limited flow may be carried out, based on the solvent assisted coaxial technique, where the flow of the core dispersion is supported by a free flowing sheath solvent. In the present work, the sheath solvents used are chloroform, toluene and dimethyl formamide and we discuss the fiber formation of Poly Methyl Methacrylate (PMMA) (dispersion-25 wt%). PMMA dispersed in chloroform is taken as the core solution and the sheath is pure solvent. The In-Situ effect of different sheath solvents in fiber formation at two different tip to collector distances are studied. The fibers formed are subjected to SEM analysis and the characteristics are analysed. The fiber formation of high viscos polymer dispersions makes the same materials subjectable to electrospinning and further applications.

scholarly journals Simultaneous Determination of Residual Antiparasitic Lactones in Bovine Muscle and Liver by Liquid Chromatography with Fluorescence Detection

2003 ◽  
Vol 86 (3) ◽  
pp. 490-493 ◽  
Author(s):  
Tomoko Nagata ◽  
Fumio Miyamoto ◽  
Yasuyuki Hasegawa ◽  
Eiichi Ashizawa
Keyword(s):  
Liquid Chromatography ◽  
Ethyl Acetate ◽  
Simultaneous Determination ◽  
Fluorescence Detection ◽  
Dimethyl Formamide ◽  
Bovine Muscle

Abstract Abamectin, doramectin, eprinomectin, ivermectin, milbemectin, and moxidectin in bovine muscle and liver were extracted with acetonitrile. The extracts were partitioned with n-hexane and then evaporated to dryness. The residue was cleaned up on Bond Elute NH2 cartridge, and the drugs were eluted from the cartridge with methanol–ethyl acetate (3 + 7). The eluate was evaporated to dryness, and residues were derivatized with N,N-dimethyl-formamide–acetic anhyride-1-methylimidazole. The derivatives were determined by liquid chromatography with fluorescence detection. Recoveries of the 6 drugs were 79.6–63.8% in muscle and 71.6–60.6% in liver at 0.01 ppm levels. The quantitation limits were 5 ppb for each drug.

Studies in polymerization - XX. On free-radical formation by oxidation of molybdenum carbonyl with carbon tetrahalides: carbon tetrachloride

1972 ◽  
Vol 326 (1567) ◽  
pp. 431-451 ◽  
Keyword(s):  
Free Radical ◽  
Carbon Tetrachloride ◽  
Methyl Methacrylate ◽  
Ethyl Acetate ◽  
Reaction Times ◽  
Radical Formation ◽  
Secondary Oxidation ◽  
Time Curve ◽  
Molybdenum Carbonyl ◽  
The Individual

The interaction of molybdenum carbonyl and carbon tetrachloride in a suitable medium gives rise to paramagnetic molybdenum products which can be studied by electron spin resonance (e. s. r.) spectroscopy. Most of the observations described in this paper have been made with ethyl acetate at 80 °C as solvent; in many respects methyl methacrylate gives similar results, but the rapid increase in viscosity accompanying polymerization limits investigation to short reaction times. E. s. r. spectra are consistent with the formation of Mo v species with one unpaired spin per Mo atom as the final oxidation state. Mo I and Mo III derivatives are not stable in the presence of carbon tetrachloride, but are rapidly oxidized to Mo v compounds. Kinetic investigations show that the signal-intensity versus reaction-time curve is sigmoid, the initial rate of growth of the signal being much lower than the rate of free-radical generation. It is concluded that there are at least two rate-determining processes in the reaction, the first being displacement of a CO ligand by solvent and the second the oxidation of an intermediate Mo species to a Mo v derivative. The first rate-determining reaction is followed rapidly by primary oxidation, producing one radical per Mo(CO) 6 consumed; this is essentially the only radical-generating step observed at short reaction times. The secondary oxidation, leading to Mo v , yields two radicals. Clearly some of the individual oxidation steps occur without radical formation; suggestions about the nature of the secondary oxidations are advanced. Measurements of carbon monoxide evolution indicate that all the CO ligands are ultimately released, and lead to the tentative conclusion that, in ethyl acetate, evolution of 5 molecules of CO per Mo(CO) 6 consumed accompanies formation of the primary radical. In methyl methacrylate CO evolution is slower, with a greater contribution from processes involved in secondary oxidation. The paramagnetic products of the reaction decompose to a diamagnetic black solid containing Mo IV on removal of volatile materials.

A surfactant-free emulsion RAFT polymerization of methyl methacrylate in a continuous tubular reactor

2015 ◽  
Vol 6 (11) ◽  
pp. 1937-1943 ◽  
Author(s):  
Zhen Li ◽  
Weijie Chen ◽  
Zhengbiao Zhang ◽  
Lifen Zhang ◽  
Zhenping Cheng ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Chain Transfer ◽  
Mixed Solvent ◽  
Raft Polymerization ◽  
Tubular Reactor ◽  
Chain Transfer Agent ◽  
Dimethyl Formamide

A surfactant-free emulsion RAFT polymerization of methyl methacrylate was successfully conducted in a continuous tubular reactor with a mixed solvent of water and dimethyl formamide in the presence of air, using CTBCOOH as the chain transfer agent and emulsion stabilizer.

scholarly journals Pyrroloquinoline based Styryl Dyes Doped PMMA, PS, and PS/TiO2 Polymer for Fluorescent Applications

2021 ◽  
Author(s):  
GANAPATI SHANKARLING ◽  
Mahesh Jachak ◽  
Rupali Bhise ◽  
Ankur Chaturvedi ◽  
Vidula Kamble
Keyword(s):  
Methyl Methacrylate ◽  
Fluorescent Properties ◽  
Forming Process ◽  
Styryl Dyes ◽  
Solar Concentrators ◽  
Poly Methyl Methacrylate ◽  
Film Forming ◽  
Fluorescent Polymers ◽  
Optical Applications ◽  
Scanning Electron

Abstract This article presents two highly fluorescent donor- π -acceptor (D-π-A) moiety containing an electron-donating carbazole and phenothiazine donors fused with electron-withdrawing pyrrolo-quinoline acceptor dyes, PQC and PQPT. We also discussed the polymerization and film-forming process of dye PQC and PQPT doped in poly (methyl methacrylate) (PMMA) and polystyrene (PS) polymer to find their optical applications in polymer-based technology. We investigated the fluorescent properties of dyes PQC and PQPT from 0.01 – 1 wt. % in poly(methyl methacrylate) (PMMA). We also investigated the changes in the spectrum shape and shift in wavelength with changes in poly(methyl methacrylate) (PMMA), polystyrene (PS), and TiO2 doped in polystyrene (PS/TiO2). The analysis of surface morphology of prepared polymer samples was done with the help of a scanning electron microscope. The thermal and photostability of synthesized dyes in poly (methyl methacrylate) (PMMA), polystyrene (PS), and TiO2 doped in polystyrene (PS/TiO2) were investigated to get detailed information owing to the application of fluorescent polymers in the field of optoelectronic, nanohybrid coatings in solar concentrators, etc.

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