Cobalt-Doped Silica Organic-Inorganic Materials by Sol-Gel Method: Preparation and Thermal Stability Calcined under N2 Atmosphere

2021 ◽  
Vol 219 (1) ◽  
pp. 247-259
Author(s):  
Jing Yang ◽  
Yuzhi Ai ◽  
Wangqing Fan ◽  
Ruihua Mu ◽  
Xi Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Sol Gel ◽  
Inorganic Materials ◽  
Gel Method ◽  
Sol Gel Method ◽  
N2 Atmosphere

A New Kind of Blue Hybrid Electroluminescent Device

2016 ◽  
Vol 16 (4) ◽  
pp. 3763-3767 ◽  
Author(s):  
Junling Wang ◽  
Zhuan Li ◽  
Chunmei Liu
Keyword(s):  
Thermal Stability ◽  
Low Cost ◽  
Sol Gel ◽  
Blue Emission ◽  
Inorganic Materials ◽  
Threshold Field ◽  
Gel Method ◽  
Sol Gel Method ◽  
Kind Of Blue ◽  
Hybrid Devices

Bright blue Electroluminescence come from a ITO/BBOT doped silica (6×10−3 M) made by a sol–gel method/Al driven by AC with 500 Hz at different voltages and Gaussian analysis under 55 V showed that blue emission coincidenced with typical triple emission from BBOT. This kind of device take advantage of organics (BBOT) and inorganics (silica). Electroluminescence from a singlelayered sandwiched device consisting of blue fluorescent dye 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiophene (BBOT) doped silica made by sol–gel method was investigated. A number of concentrations of hybrid devices were prepared and the maxium concentration was 6×10−3 M. Blue electroluminescent (EL) always occurred above a threshold field 8.57×105 V/cm (30 V) at alternating voltage at 500 HZ. The luminance of the devices increased with the concentration of doped BBOT, but electroluminescence characteristics were different from a single molecule’s photoluminescence properties of triple peaks. When analyzing in detail direct-current electroluminescence devices of pure BBOT, a single peak centered at 2.82 eV appeared with the driven voltage increase, which is similar to the hybrid devices. Comparing Gaussian decomposition date between two kinds of devices, the triple peak characteristic of BBOT was consistent. It is inferred that BBOT contributed EL of the hybrid devices mainly and silica may account for a very small part. Meanwhile the thermal stability of matrix silica was measured by Thermal Gravity-Mass Spectroscopy (TG-MS). There is 12 percent weight loss from room temperature to 1000 °C and silica has about 95% transmittance. So the matric silica played an important role in thermal stability and optical stability for BBOT. In addition, this kind of blue electroluminescence device can take advantages of organic materials BBOT and inorganic materials silica. This is a promising way to enrich EL devices, especially enriching inorganic EL color at a low cost.

Hybrid Sol-Gel Coatings

2018 ◽  
pp. 334-380 ◽  
Author(s):  
Rita Bacelar Figueira
Keyword(s):  
Sol Gel ◽  
Inorganic Materials ◽  
Mechanical And Thermal Properties ◽  
Metallic Substrates ◽  
Gel Method ◽  
Sol Gel Method ◽  
Application Range ◽  
Synthesis Conditions ◽  
Optical And Mechanical Properties ◽  
Significant Attention

The properties and wide application range of organic-inorganic hybrid (O-IH) sol-gel materials have attracted significant attention over the past decades. The combination of organic polymers and inorganic materials in a single-phase provides exceptional possibilities to tailor electrical, optical and mechanical properties concerning diverse applications. This unlimited design concept has led to the development of diverse coatings for several applications such as glasses, and metals to mitigate mechanical abrasion, erosion and corrosion. This class of materials could be easily obtained by sol-gel method at mild synthesis conditions. Furthermore, the large variety of available chemical precursors allows producing a diversity of coatings with tuned mechanical and thermal properties. This chapter will introduce the fundamentals of the sol-gel method to produce O-IH protective thin coatings and discuss the methodologies used to apply these materials onto different metallic substrates for erosion and corrosion protection.

Luminescence and thermal stability of sodium tris(pyridine dicarboxylate) terbate(III) complex incorporated in silica matrix by sol-gel method

2001 ◽  
Vol 36 (7-8) ◽  
pp. 1335-1346 ◽  
Author(s):  
Bao-li An ◽  
Jian-qing Ye ◽  
Meng-lian Gong ◽  
Xian-hong Yin ◽  
Yan-sheng Yang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Sol Gel ◽  
Silica Matrix ◽  
Gel Method ◽  
Sol Gel Method ◽  
Thermal Stability Of

Thermal stability of proton-conducting silicophosphate materials formed by sol-gel method

2009 ◽  
Vol 45 (5) ◽  
pp. 609-614 ◽  
Author(s):  
A. D. Remenyuk ◽  
T. V. Khamova ◽  
A. A. Nechitailov ◽  
O. A. Shilova ◽  
A. A. Tomasov ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Sol Gel ◽  
Proton Conducting ◽  
Gel Method ◽  
Sol Gel Method ◽  
Thermal Stability Of

scholarly journals Catalytic decomposition of methane on Ni-containing catalysts prepared by heterophase sol-gel method

2021 ◽  
Vol 340 ◽  
pp. 01011
Author(s):  
Maxim Popov ◽  
Vladimir Maximov ◽  
Viktor Kogan
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
High Activity ◽  
High Stability ◽  
Low Cost ◽  
Sol Gel ◽  
Catalytic Decomposition ◽  
Gel Method ◽  
Sol Gel Method ◽  
Decomposition Of Methane

The most promising catalysts for the catalytic decomposition of methane are nickel-containing systems, since nickel has high activity, thermal stability, thermal conductivity, and relatively low cost. In this work, catalysts were prepared by the heterophase sol-gel method and investigated using catalytic equipment. The catalysts showed high stability and lifetime during the catalytic decomposition of methane at temperatures ranging from 535 to 675°C.

scholarly journals Green synthesis of Sodium alginate mediated Fluorapatite Nanoparticle via Sol-Gel method

2021 ◽  
Vol 2 (1) ◽  
pp. 30-41
Author(s):  
Pooneh Kia ◽  
Mansor Bin Ahmad ◽  
Kamyar Shameli
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Green Synthesis ◽  
Sodium Alginate ◽  
Sol Gel ◽  
The Body ◽  
Hydroxyl Groups ◽  
Calcium Nitrate Tetrahydrate ◽  
Gel Method ◽  
Sol Gel Method

Fluorapatite (FA) can be used as a bioactive substance in the body, especially the teeth implants. The FA nanoparticle was synthesized by adding the fluorine to the structure of HA using sol–gel method and the heat treatment of 700 °C. Being low costs, eco-friendly and safer features are obvious advantages of the green synthesis of FA nanoparticles by using bio stabilizer of sodium alginate. Calcium nitrate tetrahydrate, diammonium phosphate, ammonium fluoride were used as precursors of Ca, P and F respectively with the ratio of 1:67 Ca/P. The presence of crystal structure of HA and FA investigated by the results of XRD which confirmed the substitution of hydroxyl groups with the fluorine in the crystal structure of apatite. FTIR obtained that fluorine was substituted by hydroxyl groups in the structure of fluoridated hydroxyapatite by disappearing the hydroxyl groups at 3600 cm-1 in the FA. TGA investigated the thermal stability of the nanoparticles that showed the discrepancy of weight loss for HA and FA between 600?C to 800?C. By using TEM, average sizes of 35 and 49 nm were determined for HA and FA respectively. FESEM results confirmed the shapes and distribution of particles of HA and FA in that, round like for the former and rode like for the later. The overall performance of utilizing sodium alginate (SA) as a bio-stabilizer is to obtain better precipitate which leads to having better crystallinity and smaller particle size and thermal stability remarkably improved.

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