The use of Soluble Metal-Polyselenide Complexes as Precursors to Binary and Ternary Solid Metal Selenides

1990 ◽  
Vol 180 ◽  
Author(s):  
S. Dhingra ◽  
M. G. Kanatzidis
Keyword(s):  
Solid State ◽  
Inert Atmosphere ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Electron Microscopic ◽  
X Ray ◽  
Molecular Precursor ◽  
Metal Selenides ◽  
Molecular Compounds

ABSTRACTThe use of several soluble metal polychalcogenides to prepare solid state materials is presented. Thermal gravimetric analysis (TGA) data, under inert atmosphere, of the molecular compounds (Ph4P)2[Cd(Se4)2], (Ph4P)4[Cu2Se14], (Ph4P)2[Cu4Se12], (Ph4P)4[In2Se21] and (Et4N)3[M3Se15], (M=In, TI), show that the corresponding binary solid state compounds are formed as single phases at temperatures as low as 530°C. We have grown films of CdSe, Cu2-xSe, β-In2Se3, TISe and CuInSe2 using these complexes as precursors. The films were prepared by pyrolysis of green precursor films, cast from DMF solutions. CuInSe2 was prepared by co-thermolysis of Cu/Sex and In/Sex complexes. The chemical, X-ray, spectroscopic and electron microscopic characterization of these molecular precursor-derived films as well as their charge transport characterization is reported.

Synthesis, Structure, and Characterization of La1−xBax (0 ≤ x ≤ 1)

1992 ◽  
Vol 271 ◽  
Author(s):  
Joseph E. Sunstrom ◽  
Susan M. Kauzlarich
Keyword(s):  
Magnetic Susceptibility ◽  
Powder Diffraction ◽  
Single Phase ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Temperature Dependent ◽  
X Ray ◽  
Early Transition Metal ◽  
Arc Melting

ABSTRACTThe compounds La1−xBaxTiO3 (0 ≤ × ≤ 1) have been prepared by arc melting stoichiometric amounts of LaTiO3 and BaTiO3. Single phase samples can be made for the entire stoichiometry range. The polycrystalline samples have been characterized by thermal gravimetric analysis, X-ray powder diffraction, and temperature dependent magnetic susceptibility. This series of compounds has been studied as a possible candidate for an early transition metal superconductor.

Arc Discharge Synthesis of Oxides and Carbides of Tungsten and Aluminum

2013 ◽  
Vol 8 (2) ◽  
pp. 95-101
Author(s):  
Alexey Zaikovsky ◽  
Aleksandr Fedoseev ◽  
Salavat Sakhapov ◽  
Anton Evtushenko ◽  
Marina Serebriakova ◽  
...  
Keyword(s):  
Arc Discharge ◽  
Experimental Investigations ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Synthesized Materials ◽  
Discharge Method

Experimental investigations of the possibility of arc discharge method for synthesis of nanoparticles of oxides and carbides of tungsten and aluminum have been presented. The method is based on anode atomization of composed graphite – aluminum and graphite – WO3 electrodes. The transmitted electron microscopy, thermal gravimetric analysis and X-ray diffraction were applied for the characterization of morphology and properties of synthesized materials. It was experimentally shown the arc discharge method allows to syntheses the nanoparticles of oxides and carbides of tungsten and aluminum

New polymer syntheses III. Synthesis and characterization of new unsaturated polycarbonates

1994 ◽  
Vol 6 (2) ◽  
pp. 149-154 ◽  
Author(s):  
Kamal I Aly
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
1H Nuclear Magnetic Resonance ◽  
Elemental Analyses ◽  
Interesting Class

A new interesting class of linear unsaturated polycarbonates based on 3,5-bis(p-hydroxybenzylidene)-isopropylpiperidinone (T), 3,5-divanillylidene isopropylpiperidinone (IT), or 3,5-bis(m-hydroxybenzylidene)-isopropylpiperidinone (III) have been synthesized. An interfacial phosgenation technique carried out at ambient temperature was used for the synthesis of the polycarbonates. The resulting polycarbonates were characterized by elemental analyses, infrared spectroscopy, 1H nuclear magnetic resonance spectral analysis, solubility and viscometry. The thermal behaviour of the synthesized polymers was evaluated by thermal gravimetric analysis and correlated with their structures. The crystallinity of all polymers was examined by x-ray diffraction analysis.

scholarly journals Synthesis and Characterization of MgFe2O4@MIL-53(Al) Nanocomposite as Antibacterial Drug Nanocarrier Agent

2021 ◽  
Author(s):  
Fatemeh Shateran ◽  
Mohammad Ali Ghasemzadeh
Keyword(s):  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Antibacterial Drug ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
Ft Ir

Abstract Metal-organic frameworks (MOFs) are developing as a powerful platform for the delivery and controlled release of drugs. In this study, we reported a novel magnetic framework including MgFe2O4@MIL-53(Al) for the delivery of tetracycline (TC) antibiotic. The obtained results of this research showed that 88% of the TC was loaded on the MgFe2O4@MIL-53(Al). The drug release study was performed in pH: 7.4 and pH: 5.0 which showed 75% and 83% release within 3 days. Moreover, antibacterial activities tests based on well agar diffusion were performed against Staphylococcus aureus and Escherichia coli bacteria which exhibited satisfactory antibacterial properties of TC-loaded MgFe2O4@MIL-53(Al). Moreover, the prepared structures including MgFe2O4@MIL-53(Al) and MgFe2O4@MIL-53(Al)/TC were identified using Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Scanning electron microscope (SEM) and thermal gravimetric analysis (TGA).

Characterization of Geological Materials of São Fidélis/BR for Slip Use

2012 ◽  
Vol 727-728 ◽  
pp. 710-714
Author(s):  
Zélia Maria Peixoto Chrispim ◽  
Luciana Lezira Pereira Almeida ◽  
Izabel de Souza Ramos ◽  
Maria da Gloria Alves ◽  
Jonas Alexandre
Keyword(s):  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Geological Materials ◽  
Physical Chemical ◽  
Mineralogical Compositions ◽  
Scanning Electron ◽  
Do So

The present work was performed in São Fidélis/BR, technologically characterizing four types of soil. Aiming to use them in artistic ceramic, some of their properties were determined, such as the analysis of color after burn. In order to do so, essays regarding their granulometry (sifting and sedimentation), specific gravity, chemical analysis of xray fluorescence, mineralogical identification through x-ray diffraction (DRX), differential thermal analysis (ATD), thermal gravimetric analysis (TG) and scanning electron microscopy (MEV) were carried out in the Laboratories of Universidade Estadual do Norte Fluminense (UENF).The soils were analyzed before drying at 110°C and after burn under temperatures of 750°C and 1,050°C. The analyses of results returned their physical, chemical and mineralogical compositions. Many variations of color could be observed after burn.

Preparation and Characterization of Protein-Montmorillonite Composites

2012 ◽  
Vol 184-185 ◽  
pp. 1120-1123
Author(s):  
Qian Zhu ◽  
Dai Mei Chen ◽  
Yan Liu ◽  
Xu Tao Deng ◽  
Hui Li ◽  
...  
Keyword(s):  
Interlayer Space ◽  
Weight Ratio ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Intercalation Reaction ◽  
Atomic Force

Protein-montmorillonite composites were prepared by direct and stepwise intercalation of lysozyme(LYZ) into gallery of montmorillonite(MMT), and characterized by X-ray Diffraction (XRD), Thermal Gravimetric Analysis(TGA) and Atomic Force Microscopy(AFM). The direct intercalation experiment showed that with the increase of LYZ/MMT weight ratio from 1:1 to 4:1, the interlayer space of MMT increased from 4.2nm to 6.3nm, and the adsorption amount of lysozyme onto MMT increased from 1.05mg/mg to 1.84mg/mg. While in stepwise intercalation process, the adsorption of LYZ was obviously lower than that in direct intercalation experiment, indicating that the exchange reaction between lysozyme and POP-D2000 was incomplete in the stepwise intercalation reaction.

scholarly journals From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

2019 ◽  
Vol 9 (9) ◽  
pp. 1938 ◽  
Author(s):  
Styliani Papatzani ◽  
Kevin Paine
Keyword(s):  
Flexural Strength ◽  
Mercury Intrusion Porosimetry ◽  
Manufacturing Processes ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mercury Intrusion ◽  
Differential Thermogravimetry

With the current paper three nano-Montmorillonites (nMt) are applied in cement nanohybrids: an organomodified nMt dispersion, nC2; an inorganic nMt dispersion, nC3; and an organomodified powder, nC4. nC4 is fully characterized in this paper (X-ray diffraction, scanning electron microscopy/X-ray energy dispersive spectroscopy and thermal gravimetric analysis/differential thermogravimetry. Consecutively a ternary non pozzolanic combination of fiber–cement nanohybrids (60% Portland cement (PC) and 40% limestone (LS)) was investigated in terms of flexural strength, thermal properties, density, porosity, and water impermeability. Flexural strength was improved after day 28, particularly with the addition of the inorganic nMt dispersion. There was no change in density or enhancement in pozzolanic reactions for the powder nMt. Mercury intrusion porosimetry showed that the pore related parameters were increased. This can be attributed to mixing effects and the presence of fibers. Water impermeability tests yielded ambiguous results. Clearly, novel manufacturing processes of cement nanohybrids must be developed to eliminate mixing issues recorded in this research.

Synthesis and characterization of three different structures of polyacene quinone radical polymers

2016 ◽  
Vol 30 (1) ◽  
pp. 94-99 ◽  
Author(s):  
Wenfeng Guo ◽  
Xin Mao ◽  
Chengzhang Li ◽  
Jie Yang ◽  
Lirong Du ◽  
...  
Keyword(s):  
Gravimetric Analysis ◽  
Solution Polymerization ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Step Growth ◽  
Step Growth Polymerization ◽  
High Insulation ◽  
Lcr Meter

Three types of polyacene quinone radical (PAQR) polymers were synthesized by the step-growth polymerization of naphthalene, anthracene, or anthraquinone reacting with pyromellitic dianhydride via solution polymerization under a temperature gradient. Zinc chloride was used as the catalyst, and nitrobenzene was the solvent. The different structures of PAQR polymers were analyzed by infrared, X-ray diffraction, and scanning electron microscopy. The thermal properties of PAQR polymers were described by thermal gravimetric analysis, and the electrical performances were investigated by a precision LCR meter and a digital high insulation meter.

scholarly journals Synthesis and Characterization of Bio-based Amorphous Polyamide from Dimethyl furan-2,5-dicarboxylate

2021 ◽  
Author(s):  
Lei Mao ◽  
Lijian Pan ◽  
Bomou Ma ◽  
Yong He
Keyword(s):  
Side Reaction ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
High Glass Transition Temperature ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Melt Polymerization ◽  
Infrared Spectrometer

Abstract In this research, bio-based polyamide (bio-PA) was synthesized from dimethyl furan-2,5-dicarboxylate and 1,3-cyclohexanedimethanamine by melt polymerization. The properties of bio-PA were analyzed by Fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and thermal gravimetric analysis (TGA), respectively. The results show that this bio-PA presents high glass transition temperature (Tg) from 150°C to 180°C and poor crystallization due to the asymmetric rigid structure of cyclohexane and furan. Its molecular weight is low, ascribing to the large steric hindrance from cyclohexane and furan, and the side reaction of N-methylation and decarboxylation. Besides, the results of solubility reveal that this bio-PA can be dissolved in DMSO, DMF and DMAC.

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