scholarly journals Effect of magnetic field on the synthesis of well-aligned TiO2-5CB by sol-gel method

2017 ◽  
Vol 13 (4) ◽  
pp. 690-692
Author(s):  
Nur Izzati Abu Bakar ◽  
Sheela Chandren ◽  
Nursyafreena Attan ◽  
Leaw Wai Loon ◽  
Hadi Nur
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Sol Gel ◽  
Potential Method ◽  
Ambient Condition ◽  
Drying Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
5Cb Liquid Crystal ◽  
The Magnetic Field

This paper describes the approach by using a magnetic field as a technique in order to synthesize well-aligned materials. The magnetic field technique could be a potential method because it has advantage that all of the materials could be aligned by magnetic field as long as they have magnetic anisotropy. The aim of this research is to explore the effects of magnetic field and magnetic line in the synthesis of well-aligned material, namely titania (TiO2).  The synthesis of well-aligned titania with liquid crystal as the structure-aligning agent is demonstrated under magnetic field in the presence of liquid crystal, 4′-pentyl-4-biphenylcarbonitrile (5CB), tetra-n-butyl orthotitanate (TBOT), 2-propanol and water. The mixture underwent slow hydrolysis and drying process under magnetic field (0.3 T) in ambient condition. The use of magnetic field and 5CB liquid crystal as the structure aligning agent has led to the successful formation of well-aligned TiO2-5CB via sol-gel method. When no magnetic field was applied, the TiO2-5CB obtained was spherical in shape and no alignment can be observed. This study demonstrated that magnetic field can play an important role in the synthesis of well-aligned TiO2-5CB.

Synthesis and physicochemical properties of graphene/ZrO2 composite aerogels

RSC Advances ◽  
2015 ◽  
Vol 5 (16) ◽  
pp. 11738-11744 ◽  
Author(s):  
Dongman Guo ◽  
Yun Lu ◽  
Yibo Zhao ◽  
Xuetong Zhang
Keyword(s):  
Physicochemical Properties ◽  
Supercritical Fluid ◽  
Sol Gel ◽  
Drying Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
Supercritical Fluid Drying ◽  
Composite Aerogels

Graphene/ZrO2 composite aerogels with large BET areas have been synthesized using a sol–gel method together with a supercritical fluid drying process.

scholarly journals Self-standing magnetic composite nanosheets prepared in the presence of an external magnetic field: Characterization and potential for medical applications

2020 ◽  
pp. 174751982095860
Author(s):  
Mina Sakuragi ◽  
Yoshikazu Takahashi ◽  
Keito Ehara ◽  
Katsuki Kusakabe
Keyword(s):  
Magnetic Field ◽  
Thermal Decomposition ◽  
External Magnetic Field ◽  
Decomposition Method ◽  
Sol Gel ◽  
Magnetic Composite ◽  
Magnetic Response ◽  
Gel Method ◽  
Sol Gel Method ◽  
Thermal Decomposition Method

The aim of this study is to develop self-standing, ultrathin film, nanosheets with high magnetic response for use in a medical device that can be migrated to a target location in the body by using an external magnetic field. First, iron oxide nanoparticles are synthesized by either the sol-gel method or thermal decomposition. The resulting magnetic properties of the nanoparticles show that the thermal decomposition method provides a greater saturation magnetization value than the sol-gel method. Next, the nanoparticles obtained by the thermal decomposition method are embedded into nanosheets of poly(L-lactide) at varying concentrations. Embedding of the nanoparticles in the composite nanosheets is achieved by the application of an external magnetic field. The composite nanosheets are then characterized. The thickness of the nanosheet increases, and the nanoparticles are well dispersed, with an increase in poly (L-lactide) concentration. The NP-embedded nanosheets are imaged by transmission electron microscopy, which reveals thin, long aggregates aligned in collinear line features. X-ray diffraction results indicate that the magnetic hard axis of the nanoparticles in the nanosheets is aligned in parallel to the plane of the nanosheet by magnetic field application during nanosheet preparation. In addition, the nanosheets at high poly (L-lactide) concentrations that had been subjected to a magnetic field during preparation show a slightly greater magnetic response compared with both nanosheets without magnetic field exposure and nanosheets prepared at low poly (L-lactide) concentrations.

Homogeneous liquid crystal alignment on inorganic–organic hybrid silica thin films derived by the sol–gel method

Soft Matter ◽  
2012 ◽  
Vol 8 (5) ◽  
pp. 1437-1442 ◽  
Author(s):  
Soo Sang Chae ◽  
Byoung Har Hwang ◽  
Woo Soon Jang ◽  
Jin Young Oh ◽  
Jee Ho Park ◽  
...  
Keyword(s):  
Thin Films ◽  
Liquid Crystal ◽  
Sol Gel ◽  
Gel Method ◽  
Homogeneous Liquid ◽  
Sol Gel Method ◽  
Liquid Crystal Alignment ◽  
Organic Hybrid ◽  
Hybrid Silica ◽  
Crystal Alignment

Heat generation ability in AC magnetic field of MgAlxFe2-xO4 ferrite powder prepared by sol-gel method

2016 ◽  
Author(s):  
Hideyuki Hirazawa ◽  
Yoshiki Ito ◽  
Deleg Sangaa ◽  
Namsrai Tsogbadrakh ◽  
Hiromichi Aono ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Generation ◽  
Sol Gel ◽  
Ferrite Powder ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ac Magnetic Field

Preparation of Zirconia Nanopowders in Ultrasonic Field by the Sol-Gel Method

2007 ◽  
Vol 280-283 ◽  
pp. 981-986 ◽  
Author(s):  
Xiao Xi Li ◽  
Ling Chen ◽  
Bing Li ◽  
Lin Li
Keyword(s):  
Colloidal Particles ◽  
Sol Gel ◽  
Reaction System ◽  
Potential Method ◽  
Ultrasonic Field ◽  
Zirconium Hydroxide ◽  
Hydroxyl Groups ◽  
Gel Method ◽  
Sol Gel Method ◽  
Zirconia Nanopowders

Zirconia nanopowders were prepared in the ultrasonic field by the sol-gel method and the sonochemical effect on the structure of zirconium hydroxide and the zirconia nanopowder properties were systematically investigated in this work. Ultrasound was introduced into the different stages of the synthesis of zirconia nanopowders in sol-gel reaction system, and zirconium hydroxides and the zirconia nanopowders with different properties were obtained. The results indicated that ultrasonic cavitation could not only disaggregate the agglomerates of zirconia colloidal particles but also reduce the amount of coordinated H2O, free H2O and free hydroxyl groups of the zirconium hydroxide colloidal particles, thus effectively preventing the formation of hard agglomerates in zirconia powders. Moreover, the effects of different ultrasonic output powers and treatment cycles on the structure and properties of ZrO2 nanopowders were studied by TEM, XRD and SAXS. Zirconia nanopowders with an extremely small crystallite size (10.3 nm) and a narrow size distribution were yielded with 520 W ultrasound for 6 treatment cycles on the formation period and 600 W ultrasound for 2 treatment cycles on the washing period. It is concluded that the ultrasonic field is a potential method for nanopowder preparation.

Synthesis and Photocatalytic Property of N-doped BiVO$lt;inf$gt;4$lt;/inf$gt; via Sol-Gel Method Using Corn Stem as Template

2014 ◽  
Vol 29 (8) ◽  
pp. 807
Author(s):  
WANG Min ◽  
NIU Chao ◽  
DONG Zhan-Jun ◽  
CHE Yin-Sheng ◽  
DONG Duo ◽  
...  
Keyword(s):  
Sol Gel ◽  
Photocatalytic Property ◽  
Gel Method ◽  
Sol Gel Method

Fe2O3 - TiO2 THIN FILMS PREPARED BY SOL-GEL METHOD

2011 ◽  
Vol 10 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Ramona-Crina Suciu ◽  
Marcela Corina Rosu ◽  
Teofil Danut Silipas ◽  
Emil Indrea ◽  
Violeta Popescu ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Gel Method ◽  
Sol Gel Method
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