Surface Modification of Aramid Fiber by NaOH Solution with Different Concentrations

2011 ◽  
Vol 66-68 ◽  
pp. 1067-1071
Author(s):  
Kun Qiao ◽  
Bo Zhu ◽  
Xiang Yu Yin ◽  
Cheng Rui Di ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Surface Modification ◽  
Chemical Composition ◽  
Elemental Analysis ◽  
Main Parameter ◽  
Room Temperature ◽  
Aramid Fiber ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Elongation At Break ◽  
Naoh Solution

Aramid fiber (AF) was treated by NaOH solution of various concentrations with supersonic vibration at room temperature. The density of NaOH solution was the main parameter. Elongation at break and break strength were tested. The chemical composition of AF was characterized by elemental analysis. The surface of AF was examined by scanning electronic microscopy (SEM). It was shown that elongation at break of treated AF was not decreased, and break strength was a little increased, first increases and then decreases as the concentration of NaOH solution raising. It was also found that the surface of AF after modified was a little rougher. Low concentration of NaOH solution was fit to modify AF.

Behavior of Scandium in Aluminum Alloys of Different Alloying Systems

2014 ◽  
Vol 794-796 ◽  
pp. 1002-1007
Author(s):  
Boris V. Ovsyannikov ◽  
Viktor M. Zamyatin
Keyword(s):  
Chemical Composition ◽  
Aluminum Alloys ◽  
Intermetallic Compounds ◽  
Alloy Composition ◽  
Alloying Elements ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Manganese Alloy ◽  
X Ray

Microstructure and composition of elements in phases of homogenized ingots in aluminum alloys of various alloying systems: Al-Mg-Mn-Si, Al-Mg-Si-Cu, and Al-Zn-Mg-Cu, were examined using a method of scanning electronic microscopy and X-ray microanalysis. Besides basic alloying elements of magnesium, zinc, copper, silicon, and manganese, alloy composition contained additional alloying elements, including zirconium and scandium. Presence of intermetallic compounds of various chemical composition insoluble during ingot homogenization was found in microstructure of examined samples. It is found that zirconium and scandium are jointly present in composition of some intermetallic compounds containing additional alloying elements of alloys.

Fabrication and Properties of La-Manganite/SnO2 Composites

2010 ◽  
Vol 123-125 ◽  
pp. 81-84 ◽  
Author(s):  
Geun Woo Kim ◽  
Yong Jun Seo ◽  
Jin Long Bian ◽  
Chan Gyu Lee ◽  
Bon Heun Koo
Keyword(s):  
Room Temperature ◽  
X Ray Diffraction ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
X Ray ◽  
Structure And Morphology ◽  
Low Field ◽  
Spin Polarized ◽  
Mr Effect ◽  
Spin Polarized Tunneling

Composites with compositions La0.7Ca0.3MnO3(LCMO) and La0.7Sr0.3MnO3(LSMO)/SnO2 were prepared by a standard ceramic technique. The structure and morphology of the composites have been studied by the X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The XRD and SEM results indicate that no reaction occurs between La based maganite and SnO2 grains, and that SnO2 segregates mostly at the grain boundaries of La based maganite. The variation in resistivity with temperature has been studied and shows a semiconducting behavior, furthermore the composites exhibit metallic percolation. It is interesting to note that an enhanced magnetoresisitance (MR) effect for the composites is found over a wide temperature range from low temperature to room temperature in an applied magnetic field of 0.5 Tesla. The spin-polarized tunneling and the spin-polarized tunneling may be attributed to the enhanced low-field magnetoresistance (LFMR) effect.

In Air Template-Free Synthesis of In2S3 Hierarchical Nanostructure from InCl3·4H2O and Thiourea

2010 ◽  
Vol 152-153 ◽  
pp. 63-66
Author(s):  
Shi Yin Li ◽  
Zhen Ni Du ◽  
Yong Cai Zhang
Keyword(s):  
Room Temperature ◽  
Band Gaps ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
X Ray ◽  
Hierarchical Nanostructure ◽  
Optical Band Gaps ◽  
Template Free

A novel template-free method, which was based on heating the mixture of InCl3•4H2O and thiourea in air from room temperature to 200 or 250 °C, coupled with a subsequent washing treatment using distilled water and ethanol, was proposed for the synthesis of In2S3 hierarchical nanostructure. X-ray diffraction and field emission scanning electronic microscopy demonstrated that the obtained products were pure cubic phase In2S3 urchin-like clusters built up by mainly nanoflakes (about 12–47 nm thick). UV-vis absorption spectra disclosed that the as-prepared In2S3 urchins had optical band gaps in the range of about 2.18–2.26 eV.

ROOM TEMPERATURE CONTROLLABLE SYNTHESIS OF PEROXY NIOBATES CRYSTALLITES

2009 ◽  
Vol 23 (31n32) ◽  
pp. 3825-3834 ◽  
Author(s):  
MEINAN LIU ◽  
DONGFENG XUE
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
Scanning Electronic Microscopy ◽  
Controllable Synthesis ◽  
Electronic Microscopy ◽  
Temperature Synthesis ◽  
X Ray ◽  
Group Environment

A benign room temperature synthesis process has been developed to fabricate peroxy niobates with controllable composition and morphology. X-ray diffraction and scanning electronic microscopy were used to monitor the change of the phase composition and corresponding microstructure of the obtained niobates. Furthermore, UV/Vis spectra were used to study the optical properties of these ammonium and potassium peroxy niobates. The results showed that these peroxy niobates with { O 2} units present larger bandgap than those with { O 2 F } units. Photoluminescence results well demonstrated that the Nb group environment is sensitive to its optical properties, which offers a marvelous chance for its further applications, such as sensors.

Thermomechanical Treatment of a 4340 Ni-Cr-Mo Alloy Steel

1981 ◽  
Vol 39 ◽  
pp. 314-315 ◽  
Author(s):  
M.T. Jahn ◽  
J.C. Yang ◽  
C.M. Wan
Keyword(s):  
Mechanical Property ◽  
Chemical Composition ◽  
Alloy Steel ◽  
Thermomechanical Treatment ◽  
Room Temperature ◽  
Good Combination ◽  
Thermal Treatments ◽  
Low Carbon ◽  
4340 Steel ◽  
Good Improvement

4340 Ni-Cr-Mo alloy steel is widely used due to its good combination of strength and toughness. The mechanical property of 4340 steel can be improved by various thermal treatments. The influence of thermomechanical treatment (TMT) has been studied in a low carbon Ni-Cr-Mo steel having chemical composition closed to 4340 steel. TMT of 4340 steel is rarely examined up to now. In this study we obtain good improvement on the mechanical property of 4340 steel by TMT. The mechanism is explained in terms of TEM microstructures4340 (0.39C-1.81Ni-0.93Cr-0.26Mo) steel was austenitized at 950°C for 30 minutes. The TMTed specimen (T) was obtained by forging the specimen continuously as the temperature of the specimen was decreasing from 950°C to 600°C followed by oil quenching to room temperature. The thickness reduction ratio by forging is 40%. The conventional specimen (C) was obtained by quenching the specimen directly into room temperature oil after austenitized at 950°C for 30 minutes. All quenched specimens (T and C) were then tempered at 450, 500, 550, 600 or 650°C for four hours respectively.

scholarly journals Surface modification of PMMA polymer and its composites with PC61BM fullerene derivative using an atmospheric pressure microwave argon plasma sheet

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andrzej Sikora ◽  
Dariusz Czylkowski ◽  
Bartosz Hrycak ◽  
Magdalena Moczała-Dusanowska ◽  
Marcin Łapiński ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Chemical Composition ◽  
Water Contact Angle ◽  
Plasma Sheet ◽  
Atmospheric Pressure ◽  
Argon Plasma ◽  
Fullerene Derivative ◽  
Water Contact ◽  
Pmma Polymer

AbstractThis paper presents the results of experimental investigations of the plasma surface modification of a poly(methyl methacrylate) (PMMA) polymer and PMMA composites with a [6,6]-phenyl-C61-butyric acid methyl ester fullerene derivative (PC61BM). An atmospheric pressure microwave (2.45 GHz) argon plasma sheet was used. The experimental parameters were: an argon (Ar) flow rate (up to 20 NL/min), microwave power (up to 530 W), number of plasma scans (up to 3) and, the kind of treated material. In order to assess the plasma effect, the possible changes in the wettability, roughness, chemical composition, and mechanical properties of the plasma-treated samples’ surfaces were evaluated by water contact angle goniometry (WCA), atomic force microscopy (AFM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The best result concerning the water contact angle reduction was from 83° to 29.7° for the PMMA material. The ageing studies of the PMMA plasma-modified surface showed long term (100 h) improved wettability. As a result of plasma treating, changes in the samples surface roughness parameters were observed, however their dependence on the number of plasma scans is irregular. The ATR-FTIR spectra of the PMMA plasma-treated surfaces showed only slight changes in comparison with the spectra of an untreated sample. The more significant differences were demonstrated by XPS measurements indicating the surface chemical composition changes after plasma treatment and revealing the oxygen to carbon ratio increase from 0.1 to 0.4.

scholarly journals Dichloro(η6-p-cymene)(P,P-diphenyl-N-propyl-phosphinous amide-κP)ruthenium(II)

Molbank ◽  
10.3390/m1217 ◽  
2021 ◽  
Vol 2021 (2) ◽  
pp. M1217
Author(s):  
Rebeca González-Fernández ◽  
Pascale Crochet ◽  
Victorio Cadierno
Keyword(s):  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Title Compound ◽  
Room Temperature ◽  
Toluene Solution ◽  
Catalytic Behavior ◽  
Multinuclear Nmr

The title compound, i.e., [RuCl2(η6-p-cymene)(PPh2NHnPr)] (2), was obtained in a 71% yield by reacting a toluene solution of the chlorophosphine complex [RuCl2(η6-p-cymene)(PPh2Cl)] (1) with two equivalents of n-propylamine at room temperature. The aminophosphine complex 2 was characterized by elemental analysis, multinuclear NMR (31P{1H}, 1H and 13C{1H}) and IR spectroscopy. In addition, its catalytic behavior in the hydration of benzonitrile was briefly explored.

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