Direct Synthesis of Nanocrystalline HZSM-5 Zeolite via Varying-Temperature Hydrothermal Synthesis

2013 ◽  
Vol 821-822 ◽  
pp. 1303-1306 ◽  
Author(s):  
Jun Fang Wei ◽  
Fang Zhu
Keyword(s):  
Direct Synthesis ◽  
Synthesis Method ◽  
Test Results ◽  
X Ray Diffraction ◽  
Scanning Electronic Microscopy ◽  
Temperature Synthesis ◽  
X Ray ◽  
Second Stage ◽  
Particle Size And Morphology ◽  
Size And Morphology

A nanocrystalline HZSM-5 zeolite was directly synthesized by two-stage varying-temperature synthesis method. The effects of second stage time and temperature on the particle size and morphology were of interest. The morphology of particles were specified by scanning electronic microscopy (SEM) and crystallinity of the samples were recorded by X-ray diffraction (XRD) test results. It was observed that second stage time had a strong effect on crystallinity and morphology; a highly crystalline ZSM-5 zeolite with twinned crystals was synthesised at 180 °C, 60h (second stage time and temperature ). The HZSM-5 particles synthesised at 180 °C, 18h (second stage time and temperature ) were 300600 nm in size and constructed by primary HZSM-5 nanocrystals of 20~30 nm.

Synthesis and Characterization of ZIF-8 Mixed Matrix Membranes

2014 ◽  
Vol 625 ◽  
pp. 661-664
Author(s):  
Chen Chuang Lok ◽  
Yin Fong Yeong
Keyword(s):  
Room Temperature ◽  
Synthesis Method ◽  
Mixed Matrix Membranes ◽  
Inorganic Filler ◽  
X Ray Diffraction ◽  
Mixed Matrix ◽  
Temperature Synthesis ◽  
X Ray ◽  
Matrix Membranes

In the present work, ZIF-8/6FDA-durene mixed matrix membranes (MMMs) were synthesized and characterized. ZIF-8 nanocrystals, which were used as the inorganic filler, were synthesized using rapid room-temperature synthesis method whereas 6FDA-durene polyimide was synthesized by polycondensation method followed by chemical imidization. Pure and 6FDA-durene membranes loaded with 5 wt%, 10 wt% and 15 wt% of ZIF-8 were fabricated. The structural properties and morphology of the resultant membranes were characterized by using X-ray Diffraction (XRD) and Field emission scanning electron microscope (FESEM) . The EDX images showed that ZIF-8 particles agglomerated in the polymer matrix. However, no phase separation was observed for all resultant MMMs.

Chemical Precipitation Synthesis of Nano-Crystalline Mg(OH)2

2012 ◽  
Vol 1481 ◽  
pp. 45-52
Author(s):  
A. Medina ◽  
L. Béjar ◽  
G. Herrera-Pérez
Keyword(s):  
Fourier Transform ◽  
Synthesis Method ◽  
Chemical Precipitation ◽  
X Ray Diffraction ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Particle Size And Morphology ◽  
Precipitation Synthesis ◽  
Size And Morphology ◽  
Analytical Tools

ABSTRACTMagnesium hydroxide (Mg(OH)2) nanoparticles were synthesized by chemical precipitation synthesis method. The influence of the nano-sized Mg(OH)2 on the structural modification was evaluated. The formation of Mg(OH)2 crystals were evaluated by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The particle size and morphology of Mg(OH)2was confirmed by high resolution transmission electron microscopy (HRTEM). The crystalline structure of nanoparticles was characterized by fast Fourier transform (FFT) and X-Ray diffraction (XRD), like analytical tools.

scholarly journals Interlayer Structure of Bioactive Molecule, 2-Aminoethanesulfonate, Intercalated into Calcium-Containing Layered Double Hydroxides

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Tae-Hyun Kim ◽  
Hyoung Jun Kim ◽  
Jae-Min Oh
Keyword(s):  
Layered Double Hydroxides ◽  
Solid Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcium Cation ◽  
Particle Size And Morphology ◽  
Interlayer Structure ◽  
Diffraction Patterns ◽  
Size And Morphology ◽  
Double Hydroxides

We have successfully intercalated 2-aminoethanesulfonate, a well-known biomolecule taurine, into calcium-containing layered double hydroxides via optimized solid phase intercalation. According to X-ray diffraction patterns and infrared spectroscopy, it was revealed that the intercalated taurine molecules were each directly coordinated to other calcium cation and arranged in a zig-zag pattern. Scanning electron microscopy showed that the particle size and morphology of the LDHs were not affected by the solid phase intercalation, and the surface of intercalates was covered by organic moieties. From ninhydrin amine detection tests, we confirmed that most of the taurine molecules were well stabilized between the calcium-containing LDH layers.

Solvothermal Synthesis and Characterization of Lithium Tantalate Nanoparticles

2014 ◽  
Vol 602-603 ◽  
pp. 19-22 ◽  
Author(s):  
Lin Qiang Gao ◽  
Hai Yan Chen ◽  
Zhen Wang ◽  
Xin Zou
Keyword(s):  
Electron Microscopy ◽  
Solvothermal Synthesis ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Particle Size And Morphology ◽  
Size And Morphology

Nanoscale LiTaO3 powders with perovskite structure were synthesized using the solvothermal technique with glycol as solvent at 240°C for 12h. The powders were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). XRD was used to elucidate room temperature structures using Rietveld refinement. The powders were pure single pervoskite phase with high crystallinity. FESEM and TEM were used to determine particle size and morphology. The average LiTaO3 grain size was estimated to be < 200nm, and TEM images indicated that LiTaO3 particles had a brick-like morphology. In addition, the effect of the temperature on the LiTaO3 power characterisitics was also detailed studied.

scholarly journals Formation of NanoscaleMg(x)Fe(1-x)O  (x=0.1,0.2,0.4)Structure by Solution Combustion: Effect of Fuel to Oxidizer Ratio

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Mohsen Ahmadipour ◽  
K. Venkateswara Rao ◽  
V. Rajendar
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Crystallite Size ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
X Ray ◽  
Particle Size And Morphology ◽  
Size And Morphology

Mg(x)Fe(1-x)O(magnesiowustite) nanopowder samples synthesized by solution-combustion method and fuel to oxidizer ratio (Ψ=1,1.25) are used as a control parameter to investigate how particle size and morphology vary withΨ. The method is inexpensive and efficient for synthesis of oxide nanoparticles. The average crystallite size ofMg(x)Fe(1-x)Onanoparticles was estimated from the full-width-half maximum of the X-ray diffraction peaks of powders using Debye-Scherrer’s formula; the average crystallite size varies from 16 nm to 51 nm. From X-ray diffraction analysis, it was observed thatMg(x)Fe(1-x)Onanoparticles have cubic structure. The particle size measured by particle size analyzer ranges from 37.7 nm to 73 nm which is in the order of XRD results. Thermal analysis was done by thermal gravimetric-differential thermal analyzer. The particle size and morphology of the synthesized powder were examined by transmission electron microscope and scanning electron microscope. The crystal size and particle size were compared with some of the most recently published research works by XRD and TEM. FTIR conforms formation of theMg(x)Fe(1-x)O.

Densification and Consolidation of Al 5083 Alloy Powder by Equal Channel Angular Pressing

2014 ◽  
Vol 592-594 ◽  
pp. 112-116 ◽  
Author(s):  
Kondaiah Gudimetla ◽  
B. Chaithanyakrushna ◽  
K. Chandra Sekhar ◽  
Balasubramanian Ravisankar ◽  
S. Kumaran
Keyword(s):  
Alloy Powder ◽  
Physical And Mechanical Properties ◽  
Back Pressure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Angular Pressing ◽  
Al 5083 Alloy ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Hardness Values

In this present work the elemental powders pertaining to composition of Al5083 alloy was milled using planetary ball mill (Insmart systems) for 20 h. The elemental powders are loaded in HSS vial with 10:1 ball to powder ratio at 250 RPM. Various parameters such as crystalline size, particle size and morphology have studied using X-ray diffraction analysis and scanning electron microscopy. The crystallite size of the powders determined using Williamson Hall analysis of XRD is 23 nm after 20 h of milling. These nanocrystalline Al-5083 alloy powders were consolidated using ECAP with and without application of back pressure. Physical and mechanical properties such as density and hardness values were measured for sintered and unsintered samples.

scholarly journals Effects of different Sn contents on formation of Ti2SnC by self-propagating high-temperature synthesis method in Ti-Sn-C and Ti-Sn-C-TiC systems

2014 ◽  
Vol 32 (4) ◽  
pp. 696-701 ◽  
Author(s):  
Hong-Yan Sun ◽  
Xin Kong ◽  
Wei Sen ◽  
Zhong-Zhou Yi ◽  
Bao-Sen Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Raw Materials ◽  
Synthesis Method ◽  
Combustion Products ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Scanning Electron

AbstractEffect of different Sn contents on combustion synthesis of Ti2SnC was studied using elemental Ti, Sn, C and TiC powders as raw materials in the Ti-Sn-C and Ti-Sn-C-TiC system, in which the molar ratio of Ti/C was set as 2:1. The reaction mechanism for the formation of Ti2SnC was also investigated. The results showed that the amount of Ti2SnC in combustion products firstly increased with increasing of Sn content (0.6 to 0.8 mol), and then decreased with further increasing of Sn content (1.0 to 1.2 mol). Upon addition of 15 % TiC instead of Ti and C, the optimum addition of Sn decreased to 0.7 mol and a higher purity of Ti2SnC was obtained. The Ti2SnC powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

Synthesis and Characterization of ZrB2-ZrC Composite Powders from Zircon Sand by Self-Propagating High-Temperature Synthesis Method

2018 ◽  
Vol 934 ◽  
pp. 66-70
Author(s):  
Singsarothai Saowanee ◽  
Niyomwas Sutham ◽  
Tawat Chanadee
Keyword(s):  
High Temperature ◽  
Synthesis Method ◽  
Equilibrium Composition ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Zircon Sand

ZrB2-ZrC composite powders were synthesized from zircon sand by self-propagating high-temperature synthesis (SHS). The reactions were verified and the feasibility of obtaining the predicted products was calculated from the adiabatic temperature (Tad) and the equilibrium composition using the HSC®chemistry program. The results show that the SHS products consisted of ZrB2, ZrC, ZrO2, ZrSiO4, MgO, and Mg2SiO4. Leaching the products with 0.5 M of HCl solution eliminated the by-product of MgO and the intermediate Mg2SiO4phases. The phase composition of the products was characterized by X-ray diffraction (XRD) and the morphologies were characterized by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray (EDX).

Synthesis of Li2Fe0.5Mn0.5SiO4/C as Cathode Material for Lithium-Ion Batteries Using Amorphous Li2SiO3

2015 ◽  
Vol 1120-1121 ◽  
pp. 132-136
Author(s):  
Pavel Novikov ◽  
Alexey Silin ◽  
Qing Sheng Wang ◽  
Anatoliy Popovich
Keyword(s):  
Cathode Material ◽  
Theoretical Data ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Orthorhombic Unit Cell ◽  
Sem Images ◽  
X Ray ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Li Content

A phase-pure cathode material (Li2Fe0.5Mn0.5SiO4/C) was successfully prepared by a solid-state reaction. Initially, components used amorphous Li2SiO3obtained from a liquid phase by solidification, FeC2O4*2H2O, MnC2O4*2H2O and glucose as a carbon source. The structure of the prepared cathode material was investigated by X-ray diffraction (XRD), the content of Fe, Mn, Si by Energy-dispersive X-ray spectroscopy (EDX) method, Li content by atomic absorption spectroscopy (AAS), the particle size and morphology by scanning electron microscopy (SEM). XRD data show that the sample on the basis of orthorhombic unit cell can be attributed to Pmn21space group. An analysis of SEM images showed average particles size of about 250 nm. Other results obtained (EDX, AAS) correspond approximately to the theoretical data. Electrochemical performance of the cathode material was gained from cycling between 1.5-4.8V. Discharge capacity after the first cycle reached 220 mAh/g.

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