scholarly journals Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during Pyrolysis of Aqueous TiCl4 Solution

2020 ◽  
Author(s):  
Mai Van Tuan ◽  
Mai Xuan Dung ◽  
Duong Ngoc Huyen
Keyword(s):  
Heat Treatment ◽  
Methylene Blue ◽  
Low Temperature ◽  
Low Ph ◽  
Effect Of Ph ◽  
Amorphous Tio2 ◽  
Ph Level ◽  
Tio2 Nanostructures ◽  
Tio2 Nanostructure

The TiO2 nanostructures resulted by pyrolysis of TiCl4 at low temperature of 80 oC are found to be a mixture of amorphous TiO2 complexes and anatase nanostructure whose ratio depends on the pH of the pyrolysis medium. At low pH level, the resulting TiO2 nanostructure is predominant anatase and gradually shifts to the amorphous TiO2 complexes with pH level increasing. By means of heat treatment, the amorphous TiO2 complexes can be converted back to the anatase nanostructure and then transform to rutile with the elevating temperature. Amongst of the TiO2 nanostructure recovered from amorphous TiO2 complexes, the anatase shows to be the most effective photocatalyst in decomposition of methylene blue.

scholarly journals Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during Pyrolysis of TiCl4 Aqueous Solution

2020 ◽  
Author(s):  
Mai Xuan Dung ◽  
Tuan Mai Van ◽  
Huyen Duong Ngoc
Keyword(s):  
Heat Treatment ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Low Temperature ◽  
Low Ph ◽  
Effect Of Ph ◽  
Amorphous Tio2 ◽  
Ph Level ◽  
Tio2 Nanostructures ◽  
Tio2 Nanostructure

The TiO2 nanostructures resulted by pyrolysis of TiCl4 at low temperature of 80 oC are found to be a mixture of amorphous TiO2 complexes and anatase nanostructure that depends on the pH of the pyrolysis medium. Anatase nanostructure is predominant at low pH level and gradually converts to amorphous TiO2 complexes with increasing pH level. By means of heat treatment, the TiO2 nanostructures can be recovered from amorphous TiO2 complexes. Amongst of the TiO2 nanostructure recovered from amorphous TiO2 complexes, the anatase nanostructure shows to be the strongest photocatalyst in decomposition of methylene blue.

scholarly journals Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during the Pyrolysis of an Aqueous TiCl4 Solution

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1187
Author(s):  
Huyen Duong Ngoc ◽  
Dung Mai Xuan ◽  
Tuan Mai Van
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Low Temperature ◽  
Titanium Tetrachloride ◽  
Low Ph ◽  
Tio2 Anatase ◽  
Heating Treatment ◽  
Amorphous Tio2 ◽  
Ph Level ◽  
Tio2 Nanostructures

The titanium dioxide (TiO2) nanostructures resulted by the pyrolysis of titanium tetrachloride (TiCl4) at a low temperature of 80 °C were found to be a mixture of amorphous TiO2 complexes and anatase nanostructures, whose ratio depends on the pH of the pyrolysis medium. At a low pH level, the resulting TiO2 nanostructures are predominantly anatase and gradually shift to amorphous TiO2 complexes as the pH level increases. Moreover, the amorphous TiO2 complexes can convert back to anatase nanostructures by a post-heating treatment, and can then transform to rutile with elevating temperature. Amongst the TiO2 nanostructures recovered from the amorphous TiO2 complexes, anatase appears to be the most effective photocatalyst in the decomposition of methylene blue.

JESSAIR

Alloy Digest ◽  
1965 ◽  
Vol 14 (1) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Low Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Bend Strength ◽  
Steel Company ◽  
Temperature Heat ◽  
Temperature Heat Treatment ◽  
Manganese Chromium

Abstract Jessair is a manganese, chromium, molybdenum alloy steel combining the deep harding characteristics of air-hardening steels with the simplicity of low temperature heat treatment possible in many oil-hardening steels. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength as well as fracture toughness and fatigue. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-157. Producer or source: Jessop Steel Company.

Changes in color characteristics of culinary products from turkey meat produced with the use of low-temperature heat treatment

Vsyo o myase ◽  
2020 ◽  
pp. 22-24
Author(s):  
Nasonova V.V. ◽  
◽  
Tunieva E.K. ◽  
Motovilina A.A. ◽  
Mileenkova E.V. ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Production Technology ◽  
Meat Products ◽  
Oxidation Products ◽  
Turkey Meat ◽  
Color Characteristics ◽  
Low Temperature Processing ◽  
Temperature Heat ◽  
Temperature Heat Treatment

The paper presents the results of the study on the effect of low-temperature heat treatment on color characteristics and protein oxidation products depending on the method, temperature and duration of heat treatment of culinary products from turkey meat. At present, the use of low-temperature processing in the production technology for meat products with improved organoleptic indices is a topical direction.

scholarly journals The development of low-temperature heat-treatable high-pressure die-cast Al–Mg–Fe–Mn alloys with Zn

2021 ◽  
Author(s):  
Xiangzhen Zhu ◽  
Fuchu Liu ◽  
Shihao Wang ◽  
Shouxun Ji
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Mechanical Test ◽  
Equilibrium Phase ◽  
Solution Temperature ◽  
Tem Analysis ◽  
Die Cast ◽  
Zn Concentration ◽  
Temperature Heat ◽  
Cast Alloys

AbstractIn the present work, a novel low-temperature heat-treatable recycled die-cast Al–Mg alloy was developed by adding Zn into non-heat-treatable Al–5Mg–1.5Fe–0.5Mn alloy. The results showed that Zn additions resulted in the formation of equilibrium phase T-Mg32(Al, Zn)49 under as-cast condition, which can be dissolved into the α-Al matrix at a relatively low solution temperature (430 °C) and thus set the base for the low-temperature heat treatment. The mechanical test results indicated that Zn additions had a smooth liner improvement in the strength of all as-cast alloys and T6-state alloys with 1% and 2% Zn as its concentration increased but resulted in a sharp improvement on the strength of T6-state alloy when Zn concentration increased from 2 to 3%. TEM analysis revealed that the precipitate in T6-state Al–5Mg–1.5Fe–0.5Mn–3Zn alloy is η′ phase, rather than the widely reported T″ or T′ phase in other Al–Mg–Zn alloys with approximately same Mg and Zn concentrations. After the optimized low-temperature T6 heat treatment (solution at 430 °C for 60 min and ageing at 120 °C for 16 h), the Al–5Mg–1.5Fe–0.5Mn–3Zn alloy exhibits the yield strength of 321 MPa, ultimate tensile strength of 445 MPa and elongation of 6.2%.

scholarly journals Characteristics of Black Ginseng (Panax ginseng C.A. Mayer) Production Using Ginseng Stored at Low Temperature after Harvest

Metabolites ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 98
Author(s):  
Hyo Bin Oh ◽  
Ji Won Lee ◽  
Da Eun Lee ◽  
Soo Chang Na ◽  
Da Eun Jeong ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Panax Ginseng ◽  
Low Temperatures ◽  
Sugar Content ◽  
Base Material ◽  
Free Sugar ◽  
Drying Process ◽  
Heat Treated ◽  
Black Ginseng

Ginseng processing often involves multiple drying and heat treatments. Ginseng is typically processed within one week of harvesting or is stored at low temperatures to prevent spoilage. Black ginseng (BG) is manufactured by repeating the heat treatment and drying process of ginseng several times. We compared the suitability of low-temperature stored ginseng (SG) and harvested ginseng (HG) as the components for black ginseng production. SG and HG were processed into black ginseng and the appearance change, free sugar content, and benzo[a]pyrene (BAP) content were observed. Appearance observations showed the SG to be suitable in terms of quality when heat-treated at a temperature of 95 ℃ or higher. The BAP content of the SG increased significantly as the steaming process was repeated. A maximum BAP concentration of 5.31 ± 1.12 μg/kg was measured in SG steamed from 2 to 5 times, making it unsuitable for processing into BG. SG and HG showed similar trends in the content of sucrose, fructose, and glucose during steaming. This study aimed to facilitate the proper choice of base material to improve the safety of black ginseng by limiting BAP production during processing.

The Use of Optimized ERW Technique to Improve Low Temperature Fracture Toughness of Welded Pipes

2020 ◽  
Author(s):  
Muhammad Rashid ◽  
Timothy Hylton ◽  
Neil Anderson ◽  
Laurie Collins ◽  
Leijun Li
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Low Temperature ◽  
Weld Seam ◽  
Peak Temperature ◽  
Line Pipe ◽  
Squeeze Pressure ◽  
Treatment Practices ◽  
Treatment Techniques ◽  
Research Activities

Abstract It is understood that the bondline microstructure of the line pipe ERW seam can be a zone of weakness in the pipe. To overcome this weakness, several research projects utilizing various line pipe steel grades and welding and heat treatment techniques have been conducted at EVRAZ NA. The overall goal of these efforts has been to understand the development of bondline microstructure during the ERW process and improve the weld seam fracture toughness for low temperature applications. These research activities included mill trials and Gleeble simulations. It was realized that a high toughness ERW weld seam is only possible through a tightly controlled combination of weld power, forging (squeeze) pressure, and welding speed. Research studies have indicated that the as-welded seam may not pass the standard ERW destructive tests if proper heat input and adequate squeeze pressure are not applied. Post weld heat treatment (normalizing) practice was also found to be a key element in the development of the appropriate bondline microstructure for higher toughness. Samples from pipes normalized using different heat treatment practices produced different bondline microstructures and hence different toughness properties. It was found through this study that a low (but still higher than the upper critical temperature Ac3) normalizing peak temperature and adequate soak time at the peak temperature result in improved Charpy toughness of ERW bondline microstructure.

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