Synthesis and Structural Characterization of a Tetra-Cobalt(II)-substituted Sandwich-type Tungstophosphate, (1,3-H2dap)2H4[Co4(1,3-Hdap)2(α-BPW9O34)2]·3H2O

2012 ◽  
Vol 67 (5) ◽  
pp. 495-498 ◽  
Author(s):  
Zi-Liang Wang ◽  
Hui-Ping Xi
Keyword(s):  
Uv Spectroscopy ◽  
Thermo Gravimetric Analysis ◽  
Three Dimensional ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Counter Ions ◽  
Sandwich Type ◽  
Ir And Uv Spectroscopy

A sandwich-type tungstophosphate, (1,3-H2dap)2H4[Co4 (1,3-Hdap)2(α-B-PW9O34)2] ·3H2O (1,3-dap=1,3-diaminopropane), was hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, elemental and thermo-gravimetric analysis, and IR and UV spectroscopy. The compound presents a classical tetra-transition metal-substituted sandwich framework, [Co4(1,3-Hdap)2(α-B-PW9O34)2]8-, which contains two lacunary α-B-[PW9O34]9- Keggin units linked by a rhomblike Co4O14(1,3-dap)2 cluster lying across an inversion center. The Co2+ ions are coordinated by a mono-protonated dap ligand. Isolatedly protonated 1,3-dap units act as counter-ions interacting with the [PW9O34]9- polyanions via hydrogen bonds forming a three-dimensional framework.

Research on the Basic Properties of the Bamboo Charcoal Bonded Grinding Wheel

2009 ◽  
Vol 416 ◽  
pp. 416-420 ◽  
Author(s):  
Wei Li ◽  
Zhi Yang Song ◽  
Tian Ming Yu ◽  
Bao Gong Geng
Keyword(s):  
Phenolic Resin ◽  
Resin Composite ◽  
Thermo Gravimetric Analysis ◽  
Grinding Wheel ◽  
Gravimetric Analysis ◽  
Bamboo Charcoal ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
New Material

A new BCB (Bamboo Charcoal Bonded) grinding wheel was developed by bamboo charcoal-phenolic resin composite under vacuum for ELID grinding technology. The pyrolysis behavior of the new bamboo charcoal-phenolic resin material was studied by thermo gravimetric analysis (TGA), and structural characterization of the new material was performed by scanning electron microscopy (SEM), X-ray diffraction (XRD), the friction characteristics was also investigated in this paper.

Preparation and Characterization of Conductive Polyaniline/Zirconia Nanoparticles Composites

2011 ◽  
Vol 221 ◽  
pp. 302-307 ◽  
Author(s):  
Hui Huang ◽  
Zhong Cheng Guo ◽  
Wei Zhu ◽  
Fa Chuang Li
Keyword(s):  
In Situ Polymerization ◽  
Thermo Gravimetric Analysis ◽  
Zro2 Nanoparticles ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Maximum Conductivity ◽  
Conductive Polyaniline

Conductive polyaniline/zirconia (PANI/ZrO2) composites have been synthesized by in-situ polymerization of aniline in the presence of ZrO2 nanoparticles. The structure and morph- ology of composites were characterized by Fourier-transform infrared spectra (FTIR), thermo- gravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscope (SEM). The conductivity was also investigated. The results showed that PANI and ZrO2 nanoparticles were not simply blended, and a strong interaction existed at the interface of ZrO2 and PANI. It was probably a composite at molecular level. The composites were more thermal stability than that of the pure PANI. XRD analyses confirmed PANI deposited on the surface of ZrO2 nanoparticles had no effect on crystallization performance of ZrO2 nanoparticles. Electrical conductivity measurements indicated that the conductivity of PANI/ZrO2 composites was much higher than that of PANI and the maximum conductivity obtained was 11.27S/cm at 15 wt% of ZrO2 nanoparticles.

Two Steps Synthesis of Quaternary Metal Titanate of Ba2NiTi5O13 and Characterization

2011 ◽  
Vol 364 ◽  
pp. 353-358
Author(s):  
Yin Chew Ker ◽  
Abu Bakar Mohamad
Keyword(s):  
Monoclinic Phase ◽  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Pure Phase ◽  
Average Size ◽  
Sol Gel Synthesis

Quaternary metal oxide of Ba2NiTi5O13was synthesized by using two-step sol-gel method. Excess of titanium dioxide obtained from the first step of sol-gel synthesis, were subsequently reacted in second step of sol-gel synthesis in order to produce Ba2NiTi5O13monoclinic phase. Calcination temperature of 900 °C for as long as 8 hours was needed for obtaining pure phase of Ba2NiTi5O13. Homogenous micron sized particles of Ba2NiTi5O13with average size of 0.10 μm and narrow distribution were observed using Scanning Electron Microscopy (SEM). Besides, porous structures can also be seen distributed across the surface of the particles of Ba2NiTi5O13particles. Characterization of monoclinic phase of Ba2NiTi5O13was described based on the investigations of X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) and Thermo Gravimetric Analysis (TGA).

scholarly journals A Rare Two-dimensional Network Based on 2,2ʹ-Biimidazole Bridged Double [PW11O39Ni]5– Polyanions

2011 ◽  
Vol 66 (12) ◽  
pp. 1237-1240
Author(s):  
Lin-Heng Wei ◽  
Zi-Liang Wang ◽  
Ming-Xue Li
Keyword(s):  
Uv Spectroscopy ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Brick Wall ◽  
Two Dimensional ◽  
Keggin Anion ◽  
Thermo Gravimetric ◽  
Dimensional Network ◽  
Ir And Uv Spectroscopy ◽  
Oxygen Atoms

A novel two-dimensional complex based on the mono-vacant Keggin anion [PW11O39]7−, [Ni(BIIM)3]3[{Ni(BIIM)2}2(PNiW11O39)2(BIIM)]・H2O (BIIM = 2,2ʹ-biimidazole), was hydrothermally synthesized and characterized by elemental and thermo-gravimetric analysis, IR and UV spectroscopy. Each [PW11O39]7− anion captures an Ni2+ ion forming a [PNiW11O39]5− polyanion, two of which are linked together by a BIIM ligand into a [(PNiW11O39)2(BIIM)]10− polyanion supporting two Ni(BIIM)22+ units through two terminal oxygen atoms and affording a complicated [{Ni(BIIM)2}2(PNiW11O39)2(BIIM)]6− heteropolyanion. Each of these units is further attached to four surrounding equivalent units by their own Ni(BIIM)22+ linkers into a two-dimensional brick wall-like network with (6,3) topology.

scholarly journals Synthesis and Characterization of Natural Oil Doped PVA Membrane

2020 ◽  
pp. 32-36
Author(s):  
X. S. Gama
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Appropriate Technology ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Improve Accuracy ◽  
Natural Oil ◽  
Basil Oil

In deciding the workable layout of any network an appropriate technology plays a major role and can improve accuracy and flexibility efficiently, if chosen and implemented in best possible way. The growth in the infrared applications has created a need for knowledge of its optical characteristics in the spectral region for the purpose of designing. Very little work is previously reported in natural oil doped PVA membranes. In this work, a simple attempt is made synthesize and characterize the wintergreen oil and basil oil doped PVA membranes. In investigation, basil oil and wintergreen oil doped PVA membranes were prepared and is made to characterize. The resulting membranes were characterized by Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WXAD), thermo-gravimetric analysis (TGA) and differential scanning Calorimetry (DSC).

Synthesis of ZnO and ZrO2 Powders by Mechanochemical Processing

2007 ◽  
Vol 555 ◽  
pp. 279-284 ◽  
Author(s):  
Ana Čeliković ◽  
Ljiljana Kandić ◽  
M. Zdujić ◽  
Dragan P. Uskokovic
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Mechanochemical Processing ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
X Ray ◽  
The Matrix ◽  
Inert Salt ◽  
Salt Matrix

The ZnO and ZrO2 powders were prepared by mechanochemical processing and subsequent heat treatment of the starting powder of precursors mixture of ZnCl2 and Ca(OH)2, and ZrOCl2·8H2O and NaOH, respectively. Inert salt matrix, ether CaCl2 or NaCl, which prevents particle agglomeration was formed during mechanochemical solid state reaction. After mechanochemical treatment, samples were calcined at various temperatures. Selective removal of the matrix phase by washing the resulting powder with appropriate solvent yields almost pure ZnO and ZrO2 powders. Characterization of the powders was performed by X-ray diffraction (XRD), differential thermal and thermo gravimetric analysis (DTA−TG) and scanning electron microscopy (SEM).

Coordination Compounds of Some 3d-Transition Metal Ions with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)- thiosemicarbazide

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Madalina Angelusiu ◽  
Maria Negoiu ◽  
Stefania-Felicia Barbuceanu ◽  
Tudor Rosu
Keyword(s):  
Coordination Compounds ◽  
Magnetic Moments ◽  
Thermo Gravimetric Analysis ◽  
Electronic Spectroscopy ◽  
Transition Metal Ions ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
New Compounds

The paper presents the synthesis and characterization of Cu(II), Co(II), Ni(II), Cd(II), Zn(II) and Hg(II) complexes with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)-thiosemicarbazide. The new compounds were characterized by IR, EPR, electronic spectroscopy, magnetic moments, thermo-gravimetric analysis and elemental analysis.

scholarly journals Rapid four-component synthesis of dihydropyrano[2,3-c]pyrazoles using nano-eggshell/Ti(IV) as a highly compatible natural based catalyst

BMC Chemistry ◽  
2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Arefeh Dehghani Tafti ◽  
Bi Bi Fatemeh Mirjalili ◽  
Abdolhamid Bamoniri ◽  
Naeimeh Salehi
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Reaction Times ◽  
Diffraction Field ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Work Up

AbstractNano-eggshell/Ti(IV) as a novel naturally based catalyst was prepared, characterized and applied for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives. The characterization of nano-eggshell/Ti(IV) was performed using Fourier Transform Infrared spectroscopy, X-ray Diffraction, Field Emission Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, and Thermo Gravimetric Analysis. Dihydropyrano[2,3-c]pyrazoles were synthesized in the presence of nano-eggshell/Ti(IV) via a four component reaction of aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate at room temperature under solvent free conditions. The principal affairs of this procedure are mild condition, short reaction times, easy work-up, high yields, reusability of the catalyst and the absence of toxic organic solvents.

Synthesis and Characterization of the Bismaleimides Containing Aliphatic-ether Chain for Microelectronics Application

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
J. L. Feng ◽  
C. Y. Yue ◽  
K. S. Chian
Keyword(s):  
Chain Length ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Degradation Temperature ◽  
Dielectric Thermal Analysis ◽  
Aliphatic Ether ◽  
Synthetic Reaction

AbstractThis project aims to develop and characterize a series of bismaleimide (BMI) polymers based on maleic anhydride and aliphatic-ether diamines. The effects of varying the chain length of aliphatic-ether diamines on the resultant bismaleimide systems were evaluated so that their suitability for microelectronics applications could be evaluated. The synthetic reaction and properties of the bismaleimide materials were investigated using Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Thermo- Gravimetric Analysis (TGA), Dielectric Thermal Analysis (DEA) and rheometry. Results showed that thermal, dielectric and rheological properties were all affected by the main chain length of BMI. The magnitude of the dielectric constant at 100 kHz increases with the increasing chain length. The curing peak temperature, curing heat and degradation temperature of BMI, all decrease with the increasing chain length.

scholarly journals Effects of cement and foam addition on chemo-mechanical behaviour of lightweight cemented soil (LWCS)

2019 ◽  
Vol 92 ◽  
pp. 11006 ◽  
Author(s):  
Domenico De Sarno ◽  
Enza Vitale ◽  
Dimitri Deneele ◽  
Marco Valerio Nicotera ◽  
Raffaele Papa ◽  
...  
Keyword(s):  
Mechanical Response ◽  
Construction Material ◽  
Thermo Gravimetric Analysis ◽  
Water System ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Soil Cement ◽  
Strain Behaviour ◽  
Insight Into

One of the main problems encountered in civil engineering is the management of large amounts of excavated soil, especially when the mechanical properties of this soil are not suitable for its reuse as a construction material. However, the excavated soil could represent a resource if appropriately improved. A suitable solution is the addition of cement and foam to produce lightweight cemented soils (LWCS). In this paper, an insight into the influence of foam on chemo-mineralogical and microstructural features of soil-cement-water system is presented. Time dependent mineralogical and microstructural changes have been monitored by means of X-Ray Diffraction, Thermo-gravimetric analysis and Mercury Intrusion Porosimetry. The present study shows that addition of foam does not alter the chemo-physical evolution of the soil-cement-water system. Large voids are present in the samples as footprint of air bubbles upon mixing, thus increasing porosity. Macroscopic behaviour of treated samples has been investigated by direct shear and oedometric tests. Chemo-physical evolution induced by cement addition is the major responsible for mechanical improvement showed by treated samples. Porosity of samples induced by foam addition plays a key role in the mechanical response of LWCS, inducing a transition of stress-strain behaviour from brittle and dilative to ductile and contractive as a function of increasing foam content.

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