scholarly journals Role of starch in the ceramic powder synthesis: a review

2020 ◽  
Vol 96 (3) ◽  
pp. 511-520
Author(s):  
Joanna Mastalska-Popławska ◽  
Marek Sikora ◽  
Piotr Izak ◽  
Zuzanna Góral
Keyword(s):  
Hydrothermal Synthesis ◽  
Sol Gel ◽  
Ceramic Powder ◽  
Combustion Process ◽  
Water Soluble ◽  
Synthesis Methods ◽  
Ceramic Powders ◽  
Powder Synthesis ◽  
Gel Method ◽  
Sol Gel Method

Abstract The main goal of this work was to demonstrate a broad range of starch applications in ceramic powder synthesis, and to point out that starch and its derivatives can successfully replace polyvinyl derivatives commonly used in ceramic formulations, as they are water-soluble saccharides, burn out more easily, reduce the exothermicity of the combustion reaction, and allow to receive fine and uniform ceramic powders. Starch is an eco-friendly and easily transformable natural carbohydrate polymer that is found in a variety of applications in ceramics and materials science. In this paper, we review the influence of starch on the physicochemical properties of the ceramic powders obtained by means of various synthesis methods (sol–gel method, combustion process, combined methods, and hydrothermal synthesis). Starch plays a differentiated role in each of these methods, i.e., it is a polymerizing agent in sol–gel method, a fuel in combustion process, and a substrate for carbon spheres in hydrothermal synthesis.

Effect of Surfactant on the Thermal Behavior of Cerate-Zirconate Ceramic Powder Prepared by Modified Sol-Gel Method

2015 ◽  
Vol 819 ◽  
pp. 140-145 ◽  
Author(s):  
N.A. Mazlan ◽  
N. Osman ◽  
M.H. Yaakob ◽  
A.M.Md Jani
Keyword(s):  
Thermal Decomposition ◽  
Reaction Rate ◽  
Sol Gel ◽  
Ceramic Powder ◽  
Sodium Dodecyl ◽  
Combustion Process ◽  
Carbon Chain ◽  
Decomposition Temperature ◽  
Gel Method ◽  
Sol Gel Method

BaCe0.54Zr0.36Y0.1O2.95 (BCZY10) ceramic powder was synthesized by a modified sol-gel method using metal nitrate salt as pre-cursors. The sample was prepared using three different types of surfactants namely polyethylene glycol (PEG) 6000, sodium dodecyl sulphate (SDS) and cetyltrimetylammonium bromide (CTAB). Thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectrometry was used to analyze the thermal decomposition of the dried (T=325 °C) and calcined (T=1100 °C) powder. Standard sample prepared without surfactant is denoted as A1 while the sample that prepared using PEG, SDS and CTAB as surfactant was denoted as A2, A3, and A4 respectively. TGA results indicate that all the samples were almost completely decomposed at ~800 °C except for A2. It showed the lowest thermal decomposition temperature Ttd=739 °C. The highest total weight loss ~94.7% is shown by sample A4 than others. The sample with the presence of surfactant exhibits faster reaction rate for the first decomposition stage which is t = 8 min, 11 min, and 13 min for sample A2, A3, and A4 respectively compared to A1 (t = 18 min). The A2 sample shows faster reaction rate indicates that BCZY10 compound might be formed earlier faster due to the long carbon chain posses by PEG surfactant. The higher number of carbon chain present in the surfactant may accelerate the combustion process and the formation of metal oxide compounds. FTIR spectra illustrated that the carbonate residue still remained in all the samples even after calcined at 1100 oC. This result indicates that the used of surfactant does not give a significant effect on preventing the formation of BaCO3. However, the intensity of metal-oxygen band at ~450 cm-1 become stronger indicates that the formation of BCZY10 compound was being enhanced.

scholarly journals Preparation and Photocatalytic Performance of ZnO/Sepiolite Composite Materials

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Chao Li ◽  
Huijuan Li ◽  
Guicheng He ◽  
Zhiwu Lei ◽  
Wenyuan Wu
Keyword(s):  
Composite Materials ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Environmental Pollutants ◽  
Chemical Properties ◽  
Treatment Method ◽  
Blue Dye ◽  
Synthesis Methods ◽  
Gel Method ◽  
Sol Gel Method

Photocatalytic technology is a widely used water treatment method, whose efficiency can be increased by developing a suitable photocatalyst fabrication procedure. In this study, five different synthesis methods were utilised for the preparation of novel ZnO/sepiolite photolytic composites, namely, sol-gel method, hydrothermal reduction, hydrolytic precipitation, powder sintering, and impregnation-reduction. The obtained photocatalysts were characterised by scanning electron microscopy, infrared spectroscopy, and X-ray diffraction. The differences between the applied photocatalyst preparation methods and the reasons for these differences were discussed, and the photocatalytic activities of the prepared composite materials were compared. The obtained results revealed that the physical structure, chemical properties, and photocatalytic performance of the composite produced by the sol-gel method were superior to those of the materials fabricated by the other four methods. Moreover, this material also exhibited high photocatalytic stability, while its photocatalytic degradation of methylene blue dye proceeded via a quasi-first-order reaction. The prepared composites have broad application prospects in photocatalysis and can be potentially used for treating environmental pollutants.

Synthesis of Yb-doped Ba(Ce,Zr)O3 ceramic powders by sol–gel method

Ionics ◽  
2007 ◽  
Vol 12 (6) ◽  
pp. 379-384 ◽  
Author(s):  
N. Osman ◽  
A. M. Jani ◽  
I. A. Talib
Keyword(s):  
Sol Gel ◽  
Ceramic Powders ◽  
Gel Method ◽  
Sol Gel Method

Study on Different Synthesis Methods of Spherical YAG:Ce3+ Phosphor and its Luminescence Properties

2015 ◽  
Vol 1088 ◽  
pp. 371-376 ◽  
Author(s):  
Xia Zhang ◽  
Cui Xia Yan ◽  
Rong Feng Guan
Keyword(s):  
Sol Gel ◽  
Spherical Particles ◽  
Luminescence Properties ◽  
Precipitation Method ◽  
Thermal Method ◽  
Synthesis Methods ◽  
Processing Parameter ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Precipitation

Spherical YAG:Ce3+phosphors were synthesized by three different routes namely sol-gel method, co-precipitation method and solvethermal method. The microstructure, crystallization and luminescent properties of the phosphors were studied in order to find the best processing parameter for spherical shape and good luminescence properties of YAG:Ce3+phosphor. Adding citric acid to the precursor solution resulted in the formation of spherical particles in sol-gel method. YAG:Ce3+phosphor made by co-precipitation method was separated with PEG2000, and its spherical particles of size was around 500nm. The hydro-thermal method could get perfect spherical appearance, but it needed heat treatment improve the luminescence property.

Study on synthesis and evolution of sodium potassium niobate ceramic powders by an oxalic acid-based sol–gel method

2010 ◽  
Vol 57 (1) ◽  
pp. 31-35 ◽  
Author(s):  
De-Qing Zhang ◽  
Zi-Cheng Qin ◽  
Xiu-Ying Yang ◽  
Hou-Bin Zhu ◽  
Mao-Sheng Cao
Keyword(s):  
Oxalic Acid ◽  
Sol Gel ◽  
Potassium Niobate ◽  
Ceramic Powders ◽  
Sodium Potassium ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sodium Potassium Niobate

Effects of Doping ZnO-2B2O3-7SiO2 Glass by Sol-Gel Method on BaO-Sm2O3-4TiO2 Ceramics

2011 ◽  
Vol 148-149 ◽  
pp. 1077-1080
Author(s):  
Zhong Yan ◽  
Jin Liang Huang ◽  
Yong Jun Gu ◽  
Li Hua Li ◽  
Xiao Wang
Keyword(s):  
Dielectric Properties ◽  
Sol Gel ◽  
Ceramic Powder ◽  
Tungsten Bronze ◽  
Solid State Reaction Method ◽  
Structure Type ◽  
Conventional Solid State Reaction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Bst Ceramics

BaO-Sm2O3-4TiO2 (abbreviated BST) ceramic powder was prepared by the conventional solid-state reaction method. The effects of doping ZnO-2B2O3-7SiO2 (abbreviated ZBS) glass by sol-gel method on the sintering behaviors, microstructure, phase composition and dielectric properties of BST ceramics were investigated. The experimental results reveal that the main phase of samples doped with ZBS glass is tungsten bronze structure type BaSm2Ti4O12 phase, a litter Sm2Ti2O7 phase is also observed. The sintering tenperature of BST ceramics is remarkably reduced from 1350°C to 1050°C and the good dielectric properties of εr=60.2，tanδ=0.004，τf=-7.9ppm/°C were obtained for BST ceramics doped with 6wt% ZBS glass by sol-gel method sintered at 1050°C for 3h.

scholarly journals Recent Advances in TiO2 Films Prepared by Sol-gel Methods for Photocatalytic Degradation of Organic Pollutants and Antibacterial Activities

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 613 ◽  
Author(s):  
Pant ◽  
Park ◽  
Park
Keyword(s):  
Dye Degradation ◽  
Sol Gel ◽  
Antibacterial Activities ◽  
Future Perspective ◽  
Synthesis Methods ◽  
Synthetic Dyes ◽  
Tio2 Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Recent Advances

Photocatalysis has recently emerged as an advanced, green, and eco-friendly process for the treatment of wastewater and air, and antimicrobial disinfection applications. In this context, TiO2 nanostructures have been shown to be the prominent photocatalyst candidates due to their low cost, non-toxicity, and ease of fabrication. This review highlights the investigation and development of TiO2 photocatalyst film by sol-gel method with special emphasis on the photodecolorization of synthetic dyes and antibacterial activities. Furthermore, various synthesis methods for the preparation of TiO2 films and their advantages, as well as limitations, are summarized. Finally, recent advances in TiO2 films by sol-gel method for dye degradation and antibacterial activities, challenges, and future perspective are discussed.

Synthesis and Evaluation of Amorphous Calcium Phosphate (ACP) by Various Synthesis Methods

2006 ◽  
Vol 309-311 ◽  
pp. 175-178 ◽  
Author(s):  
Mitsuhiko Ohta ◽  
Tetsuo Honma ◽  
M. Umesaki ◽  
Atsushi Nakahira
Keyword(s):  
Calcium Phosphate ◽  
Amorphous Calcium Phosphate ◽  
Sol Gel ◽  
Heat Treatments ◽  
Synthesis Methods ◽  
Gel Method ◽  
Sol Gel Method ◽  
N2 Atmosphere

Amorphous calcium phosphate (ACP) was prepared by a sol-gel method from Ca alkoxide synthesized with Ca metal and ethanol in N2 atmosphere. As-prepared products by sol-gel method were spherical ACP particles of approximately 3 to 10 nm in diameter before heat-treatments. The results from Ca-K edge of as-synthesized ACP showed only one peak around 0.2 nm, suggesting the presence of the first neighbor of Ca in Ca-PO4 cluster.

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