scholarly journals Chitin Fiber and Chitosan 3D Composite Rods

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Zhengke Wang ◽  
Qiaoling Hu ◽  
Lei Cai
Keyword(s):  
Thermal Stability ◽  
Bending Strength ◽  
Layer Structure ◽  
Precipitation Method ◽  
Layer By Layer ◽  
Bending Modulus ◽  
Acid Aqueous Solution ◽  
3D Composite ◽  
Thermal Stability Of

Chitin fiber (CHF) and chitosan (CS) 3D composite rods with layer-by-layer structure were constructed by in situ precipitation method. CHF could not be dissolved in acetic acid aqueous solution, but CS could be dissolved due to the different deacetylation degree (D.D) between CHF and CS. CHF with undulate surfaces could be observed using SEM to demonstrate that the sufficiently rough surfaces and edges of the fiber could enhance the mechanical combining stress between fiber and matrix. XRD indicated that the crystallinity of CHF/CS composites decreased and CS crystal plane d-spacing of CHF/CS composites became larger than that of pure CS rod. TG analysis showed that mixing a little amount of CHF could enhance thermal stability of CS rod, but when the content of CHF was higher than the optimum amount, its thermal stability decreased. When 0.5% CHF was added into CS matrix, the bending strength and bending modulus of the composite rods arrived at 114.2 MPa and 5.2 GPa, respectively, increased by 23.6% and 26.8% compared with pure CS rods, indicating that CHF/CS composite rods could be a better candidate for bone fracture internal fixation.

High-Temperature Dielectric Materials from Atomically-Thin Perovskites

2016 ◽  
Vol 2016 (CICMT) ◽  
pp. 000164-000168
Author(s):  
Minoru Osada ◽  
Takayoshi Sasaki
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
High Temperatures ◽  
Electronic Materials ◽  
Dielectric Materials ◽  
Layered Compound ◽  
Layer By Layer ◽  
High K ◽  
Thermal Stability Of

Abstract The search of new electronic materials for high-temperature applications has been a significant challenge in recent years. In automotive industries, for example, cutting-edge technology requires electronic components operable at high temperatures (> 200 °C). The absence of suitable capacitors is one of the major barriers to meet this goal. Here we provide a solution to these issues by using an atomically-thin perovskite nanosheet (Ca2Nb3O10), a two-dimensional material derived from the exfoliation of a layered compound. Through in-situ characterizations, we found a robust thermal stability of Ca2Nb3O10 nanosheet even in a monolayer form (~ 2 nm). Furthermore, layer-by-layer assembled nanocapacitors retained both size-free high-εr characteristic and high insulation resistance at high temperatures up to 250 °C. The simultaneous improvement of εr and thermal stability in high-k nanodielectrics is of critical technological importance for the use of high-temperature capacitors.

An in situ TEM observation on the thermal stability of a nanocrystalline FeBSi alloy

1993 ◽  
Vol 16 (5) ◽  
pp. 260-264 ◽  
Author(s):  
H.Y. Tong ◽  
B.Z. Ding ◽  
H.G. Jiang ◽  
Z.Q. Hu ◽  
L. Dong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
In Situ Tem ◽  
Thermal Stability Of

In-Situ Annealing Study on the Thermal Stability of Nickel Germanides

2007 ◽  
Vol 50 (3) ◽  
pp. 677 ◽  
Author(s):  
Jae-Wook Jae-Wook ◽  
Kyung-Hwan Kyung-Hwan ◽  
Hyoungsub Hyoungsub ◽  
Cheol-Woong Cheol-Woong ◽  
Dongwon Dongwon ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Nickel Germanides ◽  
Annealing Study ◽  
Thermal Stability Of

scholarly journals Thermal Stability of Octadecyltrichlorosilane and Perfluorooctyltriethoxysilane Monolayers on SiO2

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 210
Author(s):  
Xiangdong Yang ◽  
Haitao Wang ◽  
Peng Wang ◽  
Xuxin Yang ◽  
Hongying Mao
Keyword(s):  
Thermal Stability ◽  
Thermal Behavior ◽  
Work Function ◽  
Photoelectron Spectroscopy ◽  
Vacuum Annealing ◽  
Moderate Temperature ◽  
Ultraviolet Photoelectron Spectroscopy ◽  
X Ray ◽  
Thermal Stability Of

Using in situ ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS) measurements, the thermal behavior of octadecyltrichlorosilane (OTS) and 1H, 1H, 2H, and 2H-perfluorooctyltriethoxysilane (PTES) monolayers on SiO2 substrates has been investigated. OTS is thermally stable up to 573 K with vacuum annealing, whereas PTES starts decomposing at a moderate temperature between 373 K and 423 K. Vacuum annealing results in the decomposition of CF3 and CF2 species rather than desorption of the entire PTES molecule. In addition, our UPS results reveal that the work function (WF)of OTS remains the same after annealing; however WF of PTES decreases from ~5.62 eV to ~5.16 eV after annealing at 573 K.

Thermal stability of Pt nanowires manufactured by Ga+ focused ion beam (FIB)

2003 ◽  
Vol 777 ◽  
Author(s):  
B.J. Inkson ◽  
G. Dehm
Keyword(s):  
Thermal Stability ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Wire Surface ◽  
Cross Sectional ◽  
Partial Crystallization ◽  
Fcc Structure ◽  
Thermal Stability Of ◽  
Pt Nanowires

AbstractPt nanowires have been produced by FIB deposition of Pt thin films in a commercial Ga+ focused ion beam (FIB) system, followed by cross-sectional sputtering to form electron transparent Pt nanowires. The thermal stability of amorphous FIB manufactured Pt wires has been investigated by in-situ thermal cycling in a TEM. The Pt wires are stable up to 580-650°C where partial crystallization is observed in vacuum. Facetted nanoparticles grow on the wire surface, growing into free space by surface diffusion and minimising contact area with the underlying wire. The particles are fcc Pt with some dissolved Ga. Continued heating results in particle spheroidization, coalescence and growth, retaining the fcc structure.

scholarly journals Zinc stearate from galvanizing waste materials and its use as thermal stabilizer in PVC industries

2016 ◽  
Vol 51 (4) ◽  
pp. 261-270
Author(s):  
FK Rony ◽  
SK Ray ◽  
A Hoque ◽  
M Asaduzzaman ◽  
S Sultana ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Product Yield ◽  
Zinc Stearate ◽  
Waste Materials ◽  
Precipitation Method ◽  
Thermal Stabilizer ◽  
Thermo Gravimetric Analyzer ◽  
Lead Zinc ◽  
Zinc Dross ◽  
Thermal Stability Of

Galvanizing industries of Bangladesh produce profuse amount of environmentally hazardous solid waste materials like zinc dross which contains significant amount of valuable zinc and harmful heavy lead. Zinc was extracted as zinc chloride (ZnCl2) from zinc dross. Zinc stearate (ZnSt2) samples were prepared by precipitation method from stearic acid, sodium hydroxide and ZnCl2 by varying the amount of the reagents and product yield found within the range 96.06-99.18%. Characteristic peaks of ZnSt2 were investigated by Fourier Transform Infrared Spectroscopy (FTIR). Differential Scanning Calorimeter (DSC) onset curve assigned accurate melting point within the range 122.84-124.03°C. Surface morphology of ZnSt2 was observed by Scanning Electron Microscope (SEM) and products had semi-crystalline structure. Thermal stability of ZnSt2 was evaluated by Thermo-gravimetric Analyzer (TGA) that complied with literature. A combination of ZnSt2 and Calcium stearate (CaSt2) at 1:1 ratio was used as thermal stabilizer in the powder commercial grade PVC resin and performed better thermal stability. The dehydrochlorination temperature of PVC with mixed stearates was 344.67±1.04°C for 10% (w/w) loading whereas for PVC, PVC with 10% (w/w) ZnSt2 and PVC with 10% (w/w) CaSt2, it was 269.83±1.04°C, 317.33±1.26°C and 323.33±2.08°C respectively.Bangladesh J. Sci. Ind. Res. 51(4), 261-270, 2016

A furnace for in situ synchrotron Laue diffraction and its application to studies of solid-state phase transformations

1990 ◽  
Vol 23 (6) ◽  
pp. 545-549 ◽  
Author(s):  
H. L. Bhat ◽  
S. M. Clark ◽  
A. El Korashy ◽  
K. J. Roberts
Keyword(s):  
Experimental Data ◽  
Thermal Stability ◽  
Phase Transitions ◽  
Solid State ◽  
Synchrotron Radiation ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Laue Diffraction ◽  
Thermal Stability Of

The design of a new microfurnace for use for Laue diffraction studies of solid-state transformations is described. The furnace operates in the temperature range 298–573 K with a thermal stability of about ± 0.1 K. The potential of the synchrotron-radiation Laue diffraction technique for studies of structural phase transitions is demonstrated. Experimental data on phase transitions in caesium periodate, potassium tetrachlorozincate and pentaerythritol are presented.

Carbonate Apatite Bone Replacement

2013 ◽  
Vol 587 ◽  
pp. 17-20 ◽  
Author(s):  
Ishikawa Kunio
Keyword(s):  
Thermal Stability ◽  
Cell Response ◽  
Tissue Response ◽  
Precipitation Method ◽  
Carbonate Apatite ◽  
Inorganic Component ◽  
Bone Replacement ◽  
Thermal Stability Of

Inorganic component of bone is not hydroxyapatite but carbonate apatite. Although pure carbonate apatite (CO3Ap) has not been prepared due to the limited thermal stability of CO3Ap, dissolution - precipitation method using precursor block allows fabrication of pure CO3Ap. Fabrication of CO3Ap, cell response, tissue response and improvement of CO3Ap will be discussed.

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