Effects of Various Treatments on Structure and Performance of Naturally Green Cotton

2012 ◽  
Vol 441 ◽  
pp. 666-672
Author(s):  
Zhi Rong Tang ◽  
Ming Bo Ma ◽  
Hai Xiang Li ◽  
Xiao Shuang Zhao ◽  
Wen Long Zhou
Keyword(s):  
Ultrasonic Wave ◽  
Fiber Strength ◽  
Optical Microscope ◽  
Ethanol Solution ◽  
X Ray Diffraction ◽  
Absolute Ethyl Alcohol ◽  
Pigment Extraction ◽  
Ft Ir ◽  
And Performance ◽  
Deepening Color

Effects of various treatments with distilled water, absolute ethyl alcohol, and ethanol solution assisted with ultrasonic wave and supercritical CO2 on the structure, thermal stability and surface morphology of naturally green cotton were tested by Colorimeter, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), optical microscope and HVI 900A cotton fiber detector. Results showed that ultrasonic wave contributed to pigment extraction and supercritical CO2 treatment promoted pigment to move outward causing deepening color. The data indicated that these treatments had no significant impacts on supramolecular structure, heat-resistant quality, and single fiber strength of green cotton.

Synthesis of Silica Modified Large-Sized Hydroxyapatite Whiskers by a Hydrothermal Co-Precipitation Method

2015 ◽  
Vol 645-646 ◽  
pp. 1339-1344 ◽  
Author(s):  
Yan Ting Yin ◽  
Qing Hua Chen ◽  
Ting Ting Yan ◽  
Qing Hua Chen
Keyword(s):  
Bone Repair ◽  
Ethanol Solution ◽  
Morphological Properties ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Type ◽  
Ft Ir ◽  
Co Precipitation ◽  
Surface Modified

The objective of this study was to develop a novel silica modified large-sized hydroxyapatite whiskers with improved properties for use in bone repair applications. Large-sized whiskers with a mean length of 250μm were obtained by a hydrothermal co-precipitation method at 150°C, 7.5Mpa in high-pressure reactor. Silica modified hydroxyapatite whiskers were prepared by dissolving TEOS in ethanol solution, then sintering with hydroxyapatite. The compositional and morphological properties of prepared whiskers were studied by means of x-ray diffraction (XRD), Fouier transform infrared (FT-IR), scanning electron microscopy (SEM). The results indicated the evidence of nanosilicon dioxide particles on the surface of HAP whiskers. The size of nanosilicon dioxide particles depends on dropping and stirring rate. Hence, this new type of silica modified large-sized hydroxyapatite whiskers is a valuable candidate for biomedical applications.Key words: hydroxyapatite, hydrothermal co-precipitation, surface modified, whiskers

scholarly journals Preparation, Characterization, and Performance Analysis of S-Doped Bi2MoO6 Nanosheets

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1341 ◽  
Author(s):  
Ruiqi Wang ◽  
Duanyang Li ◽  
Hailong Wang ◽  
Chenglun Liu ◽  
Longjun Xu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Degradation Rate ◽  
X Ray Diffraction ◽  
Photo Degradation ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
And Performance ◽  
Adsorption Desorption ◽  
Excellent Stability

S-doped Bi2MoO6 nanosheets were successfully synthesized by a simple hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), N2 adsorption–desorption isotherms, Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), elemental mapping spectroscopy, photoluminescence spectra (PL), X-ray photoelectron spectroscopy (XPS), and UV-visible diffused reflectance spectra (UV-vis DRS). The photo-electrochemical performance of the samples was investigated via an electrochemical workstation. The S-doped Bi2MoO6 nanosheets exhibited enhanced photocatalytic activity under visible light irradiation. The photo-degradation rate of Rhodamine B (RhB) by S-doped Bi2MoO6 (1 wt%) reached 97% after 60 min, which was higher than that of the pure Bi2MoO6 and other S-doped products. The degradation rate of the recovered S-doped Bi2MoO6 (1 wt%) was still nearly 90% in the third cycle, indicating an excellent stability of the catalyst. The radical-capture experiments confirmed that superoxide radicals (·O2−) and holes (h+) were the main active substances in the photocatalytic degradation of RhB by S-doped Bi2MoO6.

The Effect of Ultrasonic Wave Pretreatment of Reed Leaf Cellulose Dissolved in Ionic Liquids

2013 ◽  
Vol 821-822 ◽  
pp. 47-50 ◽  
Author(s):  
Hou Jie Zhao ◽  
Chun Yan Wei ◽  
Yong Zhu Cui ◽  
Li Hua Lv ◽  
Wang Xiao
Keyword(s):  
Ultrasonic Wave ◽  
Fiber Strength ◽  
Fiber Surface ◽  
Dissolution Time ◽  
Regenerated Cellulose ◽  
Physical Change ◽  
Polarizing Microscopy ◽  
Cellulose Structure ◽  
Long Time ◽  
Ft Ir

It took long time for reed leaf cellulose to dissolve in ionic liquid (1-butyl-3-methylimidazolium chloride), and part of the cellulose was degraded and the fiber strength reduced greatly. In order to decrease its dissolution time, the ultrasonic wave pretreatment was applied in this article. Results were showed through polarizing microscopy, SEM, FT-IR and XRD. By comparing the original fiber with the regenerated cellulose, it can be concluded that Ultrasonic wave pretreatment significantly increased the crystallinity of the fiber, weakened the fibrillation on fiber surface obviously, which proved the process was a physical change and did not affect the cellulose structure.

Analysis Performance of Protein Modified Cellulose Fiber

2013 ◽  
Vol 821-822 ◽  
pp. 139-143
Author(s):  
Li Yang ◽  
Song Mei Bi ◽  
Lei Zhou ◽  
Ying Feng Wang
Keyword(s):  
Moisture Absorption ◽  
Cellulose Fiber ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
Fiber Morphology ◽  
Absorption Properties ◽  
X Ray ◽  
Protein Fiber ◽  
Degree Of Orientation ◽  
Ft Ir

In order to compare differences between the structure and properties of pupa protein fiber and rousi fiber ,test morphology and molecular structure of fiber by using optical microscope, X ray diffraction, fourier transform infrared spectroscopy (FT-IR) . The results show that:the two kinds of fiber morphology consistent with the ordinary viscose, the pupa protein fiber crystallinity and degree of orientation are higher than the rousi fiber, and rousi fibers contain small amounts of metal elements, the pupa protein fiber mechanical properties, moisture absorption properties and heat resistance are superior to rousi fiber.

Sonochemical Preparation of Ternary Europium Complexes Eu(DBM)3•phen

2011 ◽  
Vol 233-235 ◽  
pp. 2263-2266
Author(s):  
Hong Quan Yu ◽  
Tao Li ◽  
Hong Dan Wang ◽  
Bao Jiu Chen
Keyword(s):  
Close Relation ◽  
Ethanol Solution ◽  
Ultrasonic Power ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Europium Complexes ◽  
X Ray ◽  
Ft Ir ◽  
Europium Chloride ◽  
The Eu

Eu(DBM)3•phen complexes have been Successfully synthesized by the sonication of an Ethanol solution of europium chloride and dibenzoylmethanide (DBM) in the presence of 1,10-phenanthroline(phen). The properties of the Eu(DBM)3•phen complexes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform Infrared spectroscopy (FT-IR) and fluorescence spectrometry (FS). Reaction conditions, such as ultrasonic power and the concentration of complexing reagent, were found to have close relation with the morphologies of final products. The formation mechanism of Eu(DBM)3•phen complexes with ultrasonic irradiation is discussed in the context.

Characterization and Performance of Monolayer Brazed Polycrystalline CBN Abrasive Tools

2010 ◽  
Vol 126-128 ◽  
pp. 621-626 ◽  
Author(s):  
Wen Feng Ding ◽  
Jiu Hua Xu ◽  
Z.Z. Chen ◽  
Hong Hua Su ◽  
Yu Can Fu ◽  
...  
Keyword(s):  
Heating Temperature ◽  
Removal Rate ◽  
Optical Microscope ◽  
Steel Matrix ◽  
X Ray Diffraction ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
Abrasive Tools ◽  
And Performance ◽  
1045 Steel

Brazing experiments of polycrystalline CBN abrasive grains and AISI 1045 steel matrix using 95(72Ag-28Cu)-5Ti (wt.%) filler alloy were carried out at the heating temperature of 900 °C for the dwell time of 8 min. The microstructure of the brazing interface among PCBN grain, Ag-Cu-Ti alloy and steel matrix, was characterized with optical microscope, scanning electron microscope and X-ray diffraction equipment. Grinding performance of the brazed polycrystalline CBN abrasive tools was evaluated experimentally by comparison with monocrystalline CBN counterparts. The results show that the reaction layer between polycrystalline CBN abrasive grain and Ag-Cu-Ti filler layer consists of the compounds of Ti-nitride, Ti-borides and Ti3AlN. The resultants have played an important role in terms of strong chemical joining at the grain-filler interface. The brazed abrasive tools with polycrystalline CBN grains have given higher material removal rate and longer service life than that with monocrystalline CBN ones.

Cavitation Erosion Characteristics of an Iron-Based Coating Prepared by High Velocity Arc Spraying

2011 ◽  
Vol 189-193 ◽  
pp. 523-527
Author(s):  
Zhi Hua He ◽  
Yu Ping Wu ◽  
Hong Bin Sun ◽  
Yuan Zheng ◽  
Yu Dong ◽  
...  
Keyword(s):  
High Velocity ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Optical Microscope ◽  
Arc Spraying ◽  
X Ray Diffraction ◽  
High Velocity Arc Spraying ◽  
Iron Based ◽  
And Performance ◽  
Cavitation Erosion Resistance

In order to increase cavitation erosion resistance of fluid machinery, an iron-based coating was prepared by high velocity arc spraying (HVAS) on the surface of 1Cr18Ni9Ti stainless steel. The microstructure and performance were investigated respectively by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), Vickers hardness and vibratory cavitation apparatus. The results indicated that the coating had the higher hardness (8.67GPa) and the finer structure than ZG230-450 (1.86GPa) used actual in water conservancy. Compared with ZG230-450, cavitation erosion resistance of the coating was better, and the coating presented flakiness stripping mode. The results indicated that the HVAS is a promising method to prepare the cavitation resistance coating.

Structure and properties of ethylene-tetrafluoroethylene fibers fabricated by melt spinning

2017 ◽  
Vol 88 (10) ◽  
pp. 1112-1124 ◽  
Author(s):  
Lele Sun ◽  
Changfa Xiao ◽  
Jian Zhao ◽  
Shulin An ◽  
Shichao Zhang
Keyword(s):  
Melt Spinning ◽  
Room Temperature ◽  
Breaking Strength ◽  
Fiber Strength ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
And Performance ◽  
Ethylene Tetrafluoroethylene

Ethylene-tetrafluoroethylene (ETFE) fibers were fabricated by a single-screw melt spinning machine at different drawing roll speed ratios and different drawing roll temperatures. Thermogravimetric analyzer, differential scanning calorimetry, X-ray diffraction (XRD), digital fiber sound velocimeter and single fiber strength testers were used to discuss the impacts of spinning processes on the structure and performance of ETFE fibers. The results indicated that four different fibers showed a similar melting temperature at around 257℃. XRD results revealed that the largest crystallinity of four ETFE fibers was 41.1%. As the drawing temperature increased, the crystallinity of ETFE fibers decreased and the grain size increased. The breaking strength of four as-spun ETFE fibers reached up to 1.12 cN/dtex. The minimum shrinkage of ETFE fibers at 200℃ was 7%, and it was only 1% at most below 150℃. The maximum creep strain of ETFE fibers was 6% when the loading capacity was 20% of the breaking strength at room temperature and ETFE fibers had a high recovery ratio of >90% after the load was removed. Moreover, ETFE fibers showed exceptional corrosion resistance and good performance of irradiation resistance.

Cavitation Erosion Resistance of WC-Cr-Co and Cr3C2-NiCr Coatings Prepared by HVOF

2006 ◽  
Vol 15-17 ◽  
pp. 199-204 ◽  
Author(s):  
Ping Zhang ◽  
Jing Hua Jiang ◽  
Ai Bin Ma ◽  
Ze Hua Wang ◽  
Yu Ping Wu ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Optical Microscope ◽  
Hard Coatings ◽  
X Ray Diffraction ◽  
Coating Materials ◽  
And Performance ◽  
Cavitation Erosion Resistance ◽  
Microstructure And Performance ◽  
Better Than

With the aim to obtain the high cavitation-erosion-resistance coating for the surface safeguard of fluid machinery, two kinds of hard coatings (WC-Cr-Co and Cr3C2-NiCr) were prepared on 1Cr18Ni9Ti substrate by high velocity oxy-fuel spraying (HVOF), which microstructure and performance were investigated respectively by optical microscope, X-ray diffraction, Vickers hardness, scanning electron microscope (SEM), and vibratory cavitation apparatus. The results indicated that these two coatings had the higher hardness and the finer structure than ZG06Cr13Ni5Mo, which is used actual in water conservancy. The results of cavitation erosion continued for 39 hours presented that the mass loss of WC-Cr-Co and Cr3C2 -NiCr coatings increased ceaselessly with time, and the cavitation erosion speeds varied with time. Compared with ZG06Cr13Ni5Mo, their cavitation erosion resistance performances were better due to their higher hardness and finer structure, and WC-Cr-Co coating was much better than Cr3C2-NiCr coating. Obviously, the higher hardness and finer structure could strengthen the cavitation erosion resistance of coating materials.

Preparation and Thermal Stability of Micro/Nano Silicone Rubber Particles

2011 ◽  
Vol 399-401 ◽  
pp. 718-721
Author(s):  
Fei Wang ◽  
Xin Long Wang
Keyword(s):  
Thermal Stability ◽  
Silicone Rubber ◽  
Crosslinking Agent ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Ft Ir ◽  
And Performance ◽  
Polymerization Method ◽  
Thermal Stability Of

The micro/nano particles of silicone rubber were prepared with α, ω-dihydroxy polyorganosiloxane, as basic polymer and crosslinking agent via emulsion polymerization method at room temperature. The structure and performance of the particles were characterized by transmission electron microscopy (TEM), FT-IR, thermogravimetric analysis (TGA) and X-ray diffraction (XRD). The results indicated that the particles had certain ordered structure and thermal stability.

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