Synthesis and Characterization of Yttria-Doped Mesoporous Zirconia

2014 ◽  
Vol 602-603 ◽  
pp. 212-215
Author(s):  
Rui Ping Liu ◽  
Chang An Wang
Keyword(s):  
Thermal Stability ◽  
Specific Surface ◽  
Self Assembly ◽  
Pore Volume ◽  
Textural Properties ◽  
Synthesis And Characterization ◽  
Bet Specific Surface Area ◽  
Mesoporous Zirconia ◽  
Evaporation Induced Self Assembly

The yttria-doped mesoporous zirconia was successfully synthesized by evaporation induced self-assembly (EISA) method, and the microstructure and textural properties of the as-made product were studied extensively. The results showed that the as-made product possessed crystallized framework walls and a worm-like mesopore with a narrow pore distribution. The BET specific surface area and pore volume of the as-made product calcined at 500°C are 111 m2/g and 0.16 cm3/g respectively, and the corresponding data changed to 73 m2/g and 0.052 cm3/g after calcined at 700°C, which indicated that the as-made yttria-doped mesoporous zirconia possess a higher thermal stability.

Synthesis and Characterization of Magnetic Mesoporous Ɣ-FE2O3/SIO2

2014 ◽  
Vol 879 ◽  
pp. 128-133
Author(s):  
Nur Shuhada Shaari ◽  
Suhaina Mohd Ibrahim ◽  
Farinaa Md Jamil ◽  
Zuhana Ahmad Zubir ◽  
A.M. Abdullah ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Self Assembly ◽  
Quantum Interference ◽  
Silica Matrix ◽  
Synthesis And Characterization ◽  
Vibrating Sample Magnetometer ◽  
Superconducting Quantum Interference Device ◽  
Evaporation Induced Self Assembly

Magneticmesoporousɣ-Fe2O3/SiO2 synthesized using an evaporation-induced self-assembly (EISA) approach. The non-ionictriblock copolymer P123 was used as surfactant template with various amounts of iron oxide (1.8g-2.4g) and varied during the synthesis. Characterizations of the surface area and magnetic properties for prepared materials were done using N2-sorption analyses, and a superconducting quantum interference device interfaced with a vibrating sample magnetometer (SQUID-VSM) respectively. From this study, N2-sorption analysis indicated that most of the ɣ-Fe2O3domains of several nanometres were embedded in the silica matrix. In addition, the obtained magneticmesoporouscomposite which contains 2.3g amount ofiron oxide has revealedhigher magnetism saturation value of (4.564 emu/g) compared to other prepared samples which been evaluated by VSM analysis.

scholarly journals Synthesis and characterization of boron-doped ordered mesoporous carbon by evaporation induced self-assembly under HCl conditions

RSC Advances ◽  
2017 ◽  
Vol 7 (14) ◽  
pp. 8250-8257 ◽  
Author(s):  
Yan Zhang ◽  
Wenwen Dai ◽  
Yujian Liu ◽  
Binge Ma
Keyword(s):  
Self Assembly ◽  
Driving Force ◽  
Mesoporous Carbon ◽  
Boron Content ◽  
Mesoporous Structure ◽  
Synthesis And Characterization ◽  
Boron Doped ◽  
Ordered Mesoporous ◽  
Evaporation Induced Self Assembly

With double-layer hydrogen bonding and electrostatic Coulomb forces acting as the driving force, the obtained B-OMC has the well-ordered mesoporous structure, highest surface area (689.85 m2 g−1) and boron content (1.96 wt%) when pH = 4.

Synthesis and Characterization of Poly(o-chloroaniline) Micro/Nanostructures in a Novel Redox System

2015 ◽  
Vol 1120-1121 ◽  
pp. 215-219
Author(s):  
Meng Zhang ◽  
Dong Hao Sun ◽  
Ying Wang
Keyword(s):  
Thermal Stability ◽  
Ascorbic Acid ◽  
Self Assembly ◽  
Redox System ◽  
Ammonium Persulfate ◽  
Polymerization Rate ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Assembly Process

In a redox system containing ascorbic acid(AA) and ammonium persulfate(APS), Poly(o-chloroaniline)(POC) micro/nanostructures including nanoparticles, nanofibers, and microspheres were successfully prepared through a self-assembly process in absence of additional template. The results indicated that POC morphologies were strongly affected by the molar ratio of o-chloroaniline(OC) to ascorbic acid([OC]/[AA]) and the reaction temperature. The fibrillar or spherical POC micro/nanostructures could be dynamically controlled in the AA/APS redox system by changing the polymerization rate of OC monomers. Thermogravimetric analysis showed that the POC nanofibers had a better thermal stability than POC microspheres. The conductivity of POC nanofibers could reach 5.5×10-3S/cm, while the microspheres were almost insulators.

Aerosol-Assisted Sol-Gel Synthesis of Mesoporous TiO2 Materials, and Their Use as Support for Ru-Based Methanation Catalysts

2019 ◽  
Author(s):  
Ara Kim ◽  
Clément Sanchez ◽  
Bernard Haye ◽  
Cédric Boissière ◽  
Capucine Sassoye ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Self Assembly ◽  
Sol Gel ◽  
Textural Properties ◽  
High Specific Surface Area ◽  
Spherical Particles ◽  
Aerosol Process ◽  
Evaporation Induced Self Assembly

<div>Mesoporous TiO<sub>2</sub> materials have been prepared by an aerosol process, which leverages on the acetic acid-mediated sol-gel chemistry and on the evaporation-induced self-assembly phenomenon to obtain materials with high specific surface area and large mesoporous volume. The obtained spherical particles are calcined to release the porosity. It is shown that the mesoscopic order can be preserved when the calcination is carried out at relatively low temperature (375 °C and below). Harsher calcination conditions lead to the progressive destruction of the mesostructured, concomitant with a progressive drop of textural properties and with the crystallization of larger anatase domains. The mesoporous TiO<sub>2</sub> material calcined at 350°C (specific surface area = 260 m².g<sup>-1</sup>; pore volume = 0.36 cm³.<sup>-1</sup>; mean pore diameter = 5.4 nm) was selected as a promising support for preformed RuO<sub>2</sub> nanoparticles, and subsequently annealed in air. It is shown that the presence of RuO<sub>2</sub> nanoparticles and subsequent annealing provoke further intense modification of the texture and crystallinity of the TiO<sub>2</sub> materials. In addition to a drop in the textural parameters, a RuO<sub>2</sub>-mediated crystallization of rutile TiO<sub>2</sub> is highlighted at temperature as low as 250°C. After an in situ reduction in H<sub>2</sub>, the catalysts containing TiO<sub>2</sub> rutile and relatively small RuO<sub>2</sub> crystals showed the highest activity in the methanation of CO<sub>2</sub>. </div>

Aerosol-Assisted Sol-Gel Synthesis of Mesoporous TiO2 Materials, and Their Use as Support for Ru-Based Methanation Catalysts

2019 ◽  
Author(s):  
Ara Kim ◽  
Clément Sanchez ◽  
Bernard Haye ◽  
Cédric Boissière ◽  
Capucine Sassoye ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Self Assembly ◽  
Sol Gel ◽  
Textural Properties ◽  
High Specific Surface Area ◽  
Spherical Particles ◽  
Aerosol Process ◽  
Evaporation Induced Self Assembly

<div>Mesoporous TiO<sub>2</sub> materials have been prepared by an aerosol process, which leverages on the acetic acid-mediated sol-gel chemistry and on the evaporation-induced self-assembly phenomenon to obtain materials with high specific surface area and large mesoporous volume. The obtained spherical particles are calcined to release the porosity. It is shown that the mesoscopic order can be preserved when the calcination is carried out at relatively low temperature (375 °C and below). Harsher calcination conditions lead to the progressive destruction of the mesostructured, concomitant with a progressive drop of textural properties and with the crystallization of larger anatase domains. The mesoporous TiO<sub>2</sub> material calcined at 350°C (specific surface area = 260 m².g<sup>-1</sup>; pore volume = 0.36 cm³.<sup>-1</sup>; mean pore diameter = 5.4 nm) was selected as a promising support for preformed RuO<sub>2</sub> nanoparticles, and subsequently annealed in air. It is shown that the presence of RuO<sub>2</sub> nanoparticles and subsequent annealing provoke further intense modification of the texture and crystallinity of the TiO<sub>2</sub> materials. In addition to a drop in the textural parameters, a RuO<sub>2</sub>-mediated crystallization of rutile TiO<sub>2</sub> is highlighted at temperature as low as 250°C. After an in situ reduction in H<sub>2</sub>, the catalysts containing TiO<sub>2</sub> rutile and relatively small RuO<sub>2</sub> crystals showed the highest activity in the methanation of CO<sub>2</sub>. </div>

Synthesis and Characterization of Hematite Nanoparticles as Active Photocatalyst for Water Splitting Application

2013 ◽  
Vol 594-595 ◽  
pp. 73-77 ◽  
Author(s):  
Sze Mei Chin ◽  
Suriati Sufian ◽  
Jeefferie Abd Razak
Keyword(s):  
Surface Area ◽  
Water Splitting ◽  
Combustion Method ◽  
Hydrogen Gas ◽  
Bet Surface Area ◽  
Synthesis And Characterization ◽  
Hematite Nanoparticles ◽  
X Ray ◽  
Bet Specific Surface Area

This paper highlights on the hydrogen production through photocatalytic activity by using hematite nanoparticles synthesized from self-combustion method based on different stirring period. The morphologies and microstructures of the nanostructures were determined using Field-Emission Scanning Electron Microscope (FESEM), X-Ray Diffractometer (XRD) and Particle Size Analyser (PSA). Besides that, surface area analyser was used to determine the BET surface area of the hematite samples. The hematite nanocatalyst as-synthesized are proven to be rhombohedral crystalline hematite (α-Fe2O3) with particle diameters ranging from 60-140 nm. The BET specific surface area of hematite samples increased from 5.437 to 7.6425 m2/g with increasing stirring period from 1 to 4 weeks. This caused the amount of hydrogen gas produced from photocatalytic water splitting to increase as well.

Synthesis and characterization of novel dibenz[a,c]anthracenedicarboxythioimides: the effect of thionation on self-assembly

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78784-78790 ◽  
Author(s):  
Katie. M. Psutka ◽  
Kenneth E. Maly
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Synthesis And Characterization ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Self Association

The effect of thionation on the formation of columnar liquid crystalline phases of dibenzanthracenedicarboximides as well as their self-association in solution is described.

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