Structure, morphology and thermal stability of synthetic fluorine mica and its organic derivatives

2011 ◽  
Vol 54 (3-4) ◽  
pp. 226-234 ◽  
Author(s):  
D.H.S. Souza ◽  
K. Dahmouche ◽  
C.T. Andrade ◽  
M.L. Dias
Keyword(s):  
Thermal Stability ◽  
Structure Morphology ◽  
Thermal Stability Of

scholarly journals Synthesis, characterization, and antibacterial activity of N-substituted quaternized chitosan and its cellulose-based composite film

BioResources ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 415-428
Author(s):  
Qiyuan Chen ◽  
Shengling Xiao ◽  
Sheldon Q. Shi ◽  
Liping Cai
Keyword(s):  
Thermal Stability ◽  
Antibacterial Activity ◽  
Schiff Base ◽  
Food Packaging ◽  
Cellulose Film ◽  
Amino Groups ◽  
Quaternized Chitosan ◽  
Reinforcing Agent ◽  
Structure Morphology ◽  
Thermal Stability Of

A water and organic soluble N-benzyl-N,N-diethyl quaternized chitosan (NSQC) material was synthesized using chitosan, benzaldehyde, and bromoethane. Amino groups on chitosan reacted with benzaldehyde to form a Schiff base intermediate. Quaternized chitosan was obtained by reacting the Schiff base with bromoethane. The quaternized chitosan was dissolved in an organic solution with dissolved cellulose and cast to prepare quaternized chitosan/cellulose (QCC) film. The molecular structure, morphology, tensile strength, thermal stability, and antibacterial activity effects of NSQC-treated cellulose film were studied in detail. The results showed that the NSQC product exhibited superior solubility in deionized water and dimethylacetamide. The addition of NSQC as a reinforcing agent in QCC film enhanced the interlinking of fibers and slowed down the rate of cellulose pyrolysis, which improved the tensile properties and thermal stability of the cellulose film. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values of NSQC showed that it had good antibacterial activity against Staphylococcus aureus and Escherichia coli. The QCC film also showed contact sterilization ability with regards to two kinds of bacteria, which suggested that QCC film has the potential for applications in food packaging and bacterial barriers.

scholarly journals Effect of Lanthanum Doping on the Microstructure, Thermal Stability, and CO2 Adsorption Property of ZIF-8

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Sheng Wang ◽  
Shengquan Zhang ◽  
Xueyan Du ◽  
Yingying Shen ◽  
Zhiwei Ma
Keyword(s):  
Thermal Stability ◽  
Adsorption Property ◽  
Research Process ◽  
X Ray Diffraction ◽  
Lanthanum Doping ◽  
Microstructure Stability ◽  
Structure Morphology ◽  
Metal Organic ◽  
The Relationship ◽  
Thermal Stability Of

The reaction materials La(NO3)3·6H2O, Zn(NO3)2·6H2O, and 2-methylimidazole were mixed in a certain proportion. A research process innovatively adopts the parallel flow-drop solvothermal method and a lanthanum-doping method to achieve the synthesis of metal organic frameworks. In this study, we successfully introduce lanthanum into the framework of ZIF-8 to stabilize the spatial structure and improve its performance. The structure and properties of La-ZIF-8 were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetry analysis (TGA), and fourier transform infrared spectroscopy (FTIR). The relationship between microstructure stability and macroscopical properties is illustrated. The results show that the doping of lanthanum is beneficial for improving the thermal stability and CO2 adsorption property of ZIF-8 because of the improvement in the microstructure. The introduction of lanthanum to the ZIF-8 is also beneficial for forming porous frameworks and raising the thermal stability and CO2 adsorption properties. The crystallinity, structure, morphology, and thermal stability of La-ZIF-8 are optimal at the La content of 2 atom.%.

Structure, morphology and thermal stability of electrochemically obtained Ni–Co deposits

2009 ◽  
Vol 496 (1-2) ◽  
pp. 110-116 ◽  
Author(s):  
L.D. Rafailović ◽  
W. Artner ◽  
G.E. Nauer ◽  
D.M. Minić
Keyword(s):  
Thermal Stability ◽  
Structure Morphology ◽  
Thermal Stability Of

scholarly journals Structure, Morphology and Thermal Stability of Porous Carbon Nanofibers Loaded with Cobalt Nanoparticles

2011 ◽  
Vol 6 (4) ◽  
pp. 155892501100600
Author(s):  
Dawei Gao ◽  
Hui Qiao ◽  
Qingqing Wang ◽  
Yibing Cai ◽  
Qufu Wei
Keyword(s):  
Thermal Stability ◽  
Carbon Nanofibers ◽  
Porous Carbon ◽  
Composite Nanofibers ◽  
Structural Integrity ◽  
Cobalt Nanoparticles ◽  
Structure Morphology ◽  
Bet Analysis ◽  
Fibrous Morphology ◽  
Thermal Stability Of

Porous carbon/cobalt (C/Co) composite nanofibers with diameters of 200–300 nm were prepared by electrospinning and subsequent carbonization processes. Two polymer solutions of polyacrylonitrile (PAN), polyvinyl pyrrolidone (PVP), and Co (CH3COOH) 2 (Co (OAc) 2) were used as C/Co composite nanofiber precursors. The study revealed that C/Co composite nanofibers were successfully prepared and cobalt particles with diameters of 20–30 nm were uniformly scattered in the carbon nanofibers. It was also observed that clear fibrous morphology with grainlike particles and good structural integrity were still maintained after calcination. The TGA analysis indicated the improved thermal stability properties of the composite nanofibers. The Brunauer-Emmett-Teller (BET) analysis indicated that C/Co composites nanofibers with meso-pores possessed larger specific surface area than that of carbon nanofibers.

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

Microstructure studies of tungsten silicide schottky contacts on Gaas

1987 ◽  
Vol 45 ◽  
pp. 328-329
Author(s):  
Yih-Cheng Shih ◽  
E. L. Wilkie
Keyword(s):  
Thermal Stability ◽  
Field Effect Transistors ◽  
Schottky Contact ◽  
Schottky Contacts ◽  
Excellent Thermal Stability ◽  
Barrier Heights ◽  
Gaas Substrates ◽  
Film Adhesion ◽  
Threshold Voltages ◽  
Thermal Stability Of

Tungsten silicides (WSix) have been successfully used as the gate materials in self-aligned GaAs metal-semiconductor-field- effect transistors (MESFET). Thermal stability of the WSix/GaAs Schottky contact is of major concern since the n+ implanted source/drain regions must be annealed at high temperatures (∼ 800°C). WSi0.6 was considered the best composition to achieve good device performance due to its low stress and excellent thermal stability of the WSix/GaAs interface. The film adhesion and the uniformity in barrier heights and ideality factors of the WSi0.6 films have been improved by depositing a thin layer of pure W as the first layer on GaAs prior to WSi0.6 deposition. Recently WSi0.1 has been used successfully as the gate material in 1x10 μm GaAs FET's on the GaAs substrates which were sputter-cleaned prior to deposition. These GaAs FET's exhibited uniform threshold voltages across a 51 mm wafer with good film adhesion after annealing at 800°C for 10 min.

Thermal stability of Al-Cu-Fe icosahedral alloys

1991 ◽  
Vol 1 (12) ◽  
pp. 1823-1836 ◽  
Author(s):  
M. Bessière ◽  
A. Quivy ◽  
S. Lefebvre ◽  
J. Devaud-Rzepski ◽  
Y. Calvayrac
Keyword(s):  
Thermal Stability ◽  
Thermal Stability Of
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