Study on the Preparation and Performance of Carboxymethyl Chitosan Calcium and Carboxymethyl Chitosan Zinc Composite Materials

2016 ◽  
Vol 852 ◽  
pp. 1319-1324 ◽  
Author(s):  
Jing Li ◽  
Chang Ping Wei ◽  
Feng Ming Wang ◽  
Li Dan Dong ◽  
Shuang Sun ◽  
...  
Keyword(s):  
Chloride Solution ◽  
Water Solubility ◽  
Chloroacetic Acid ◽  
Sem Analysis ◽  
Carboxymethyl Chitosan ◽  
X Ray Diffraction ◽  
Test Study ◽  
Alkaline Conditions ◽  
And Performance ◽  
Better Than

In this paper,under alkaline conditions,with chloroacetic acid to modify chitosan,obtained carboxymethyl chitosan. At pH<7 conditions,the obtained carboxymethy chitosan respectively were reacted with calcium chloride solution,zinc chloride solution,after fully reacted,obtained carboxymethyl chitosan calcium and carboxymethyl chitosan zinc .Through infrared spectrum,X-ray diffraction and scanning electron microscopy (sem) analysis means,the structure of the products were characterized.Through the cutting of mice tail hemostasia test ,study the performance of the product.The results showed that the water solubility of carboxymethyl chitosan is better than that of chitosan and with excellent performance,and the performance of carboxymethyl chitosan calcium and carboxymethyl chitosan zinc was better than that of carboxymethyl chitosan.

Preparation, Characterization and Hemostatic Properties of Chitosan Caffeates

2019 ◽  
Vol 814 ◽  
pp. 365-371
Author(s):  
Si Tong Lu ◽  
Dong Ying Zhang ◽  
Zhang Hu ◽  
Si Dong Li ◽  
Pu Wang Li
Keyword(s):  
Caffeic Acid ◽  
Freeze Drying ◽  
Water Solubility ◽  
Crystal Form ◽  
Positive Control ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Yunnan Baiyao ◽  
Better Than

In this paper, chitosan and caffeic acid were used as starting materials to prepare chitosan caffeates by reflux-heating and freeze-drying. The structures of chitosan caffeates were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and potentiometric titration. At the same time, the physical properties of chitosan caffeates were tested and the hemostatic properties were evaluated. The results showed that four chitosan caffeates with different mass ratios of chitosan and caffeic acid (1:1, 1:2, 1:4, 1:6) had been successfully prepared, which enhanced the water solubility. FTIR analysis demonstrated that caffeic acid had been successfully grafted onto chitosan chains. XRD showed that the crystal form of chitosan changed to some extent and the chain had some regularity in some directions, but its crystallinity reduced. Chitosan caffeates, particularly mass ratio of 1:1, showed excellent hemostatic properties and even better than chitosan and the positive control (Yunnan Baiyao), which were expected to be developed as an effective biomaterial for hemostasis.

Study on Characteristics of Outlast Acrylic Fiber

2012 ◽  
Vol 627 ◽  
pp. 85-89 ◽  
Author(s):  
Hai Xia Zhang ◽  
Xi Chang Zhang
Keyword(s):  
Mechanical Properties ◽  
Phase Change ◽  
Physical And Mechanical Properties ◽  
Decomposition Temperature ◽  
X Ray Diffraction ◽  
Acrylic Fiber ◽  
Change Temperature ◽  
And Performance ◽  
Cooling Velocity ◽  
Better Than

To analyze the structure and performance of Outlast acrylic fiber, the fiber structure was observed respectively by FTIR spectra, X-ray diffraction and scanning electron microscope, the normal physical and mechanical properties were measured, and the thermo-regulated performance was investigated by differential scanning calorimeter, thermal gravimeter analysis and step cooling test. The results indicate that the structure and normal physical and mechanical properties of Outlast acrylic fiber are slightly different from that of normal acrylic fiber. Both the melting peak and crystallization peak of Outlast acrylic fiber are single peaks, and the phase change temperature range is applicable and the phase change enthalpy is high. The decomposition temperature of Outlast acrylic fiber is around 311.85°C. The cooling velocity of Outlast acrylic fiber decreases exponentially with the increase in time, and the thermo-regulated ability of Outlast acrylic fiber is better than that of normal acrylic fiber.

Preparation and Performance of Titanium Matrix Anodized Oxide Coating Anode Ru-Ir-Ti/Ti

2013 ◽  
Vol 833 ◽  
pp. 247-251
Author(s):  
Lin Su ◽  
Jin Hu ◽  
Yu Tian Wang ◽  
Wei Jun Zhang ◽  
Ying Li
Keyword(s):  
Titanium Oxide ◽  
Pechini Method ◽  
Substrate Surface ◽  
Titanium Substrate ◽  
Oxide Coating ◽  
X Ray Diffraction ◽  
X Ray ◽  
And Performance ◽  
Electronic Microscope ◽  
Better Than

In this study, modification of the anodizing titanium substrate surface will be used to prepare titanium oxide films that have a porous structure. A Ru-Ir-Ti/Ti anode oxide coating was prepared by the Pechini method. The microstructure of the coating is observed by scanning electronic microscope (SEM). The phase of the coating is analyzed by X-ray diffraction. The electrochemical properties of the coating are studied by Energy Dispersive X-ray (EDX) and the tests of polarization curves, cyclic voltammetry and strengthen electrolysis life. The results show that titanium oxide film prepared by anodic oxidation owns porous morphology and the chlorine release of the anode coating is less active, while the electro-catalytic activity of this coating is slightly better than non-anodized anodic coating. Its strengthening electrolysis life is also poor.

Basicity, Water Solubility and Intrinsic Viscosity of Carboxymethyl Chitosan as a Biofunctional Material

2012 ◽  
Vol 531 ◽  
pp. 507-510 ◽  
Author(s):  
Xiang Ping Kong ◽  
Juan Wang ◽  
Chun Jie Wang ◽  
Xia Wu
Keyword(s):  
Molecular Weight ◽  
Acetic Acid ◽  
Intrinsic Viscosity ◽  
Water Solubility ◽  
Average Molecular Weight ◽  
Carboxymethyl Chitosan ◽  
Molecular Weight Determination ◽  
Solution Ph ◽  
Alkaline Conditions

The basicity, water solubility, intrinsic viscosity and molecular weight of carboxymethyl chitosan (CM-chitosan) were investigated. The solution pH remained at about 9.2 at the concentration of higher than 2.0 g/L. The isoelectric point of CM-chitosan was about 4.5 of pH, and the solubility of CM-chitosan at the solution pH of 2.0 to 6.0 was lower than 5 g/L. The acetic acid could be replaced by hydrochloric acid as solvent for the viscosity-average molecular weight determination of chitosan. The intrinsic viscosity values of CM-chitosan have significant differences in acidic and alkaline conditions. The viscosity-average molecular weight of CM-chitosan was (3.8 ± 0.2) × 105, consistent with that of product chitosan of blank test.

Semi-Solid Preparation and Performance of Magnesium Based Thermoelectric Materials

2012 ◽  
Vol 192-193 ◽  
pp. 569-574
Author(s):  
Ren Bo Song ◽  
Yong Lin Kang ◽  
Jian Lin Sun
Keyword(s):  
Electrical Conductivity ◽  
Thermoelectric Materials ◽  
Raw Materials ◽  
Sem Analysis ◽  
Plasma Sintering ◽  
And Performance ◽  
Semi Solid ◽  
The One ◽  
Increasing Temperature ◽  
Better Than

Ternary Mg-based thermoelectric materials are prepared by Semi-Solid Processing (SSP) and Spark Plasma Sintering (SPS). DTA, XRD and SEM analysis are applied to explore the processing conditions of Mg2Si1-xSnx (x=0, 0.2, 0.4, 0.6, 0.8, 1). The results show that raw-materials should be put into the furnace at 773 K, and kept 60 min in 1123 K. Then stirring 5 min under semi-solid state and air cooled finally. At temperature of 1023 K, pressure of 30 MPa, the sample is sintered by SPS. The XRD shows that the peaks of sample are sharp and complete, and move left with increasing Sn. The thermoelectric properties of Mg2Si1-xSnx (x=0.4, 0.6) are analyzed between 373 K to 673 K. Results indicate that electrical conductivity (σ) increases continually, Seebeck coefficient (α) increases then decreases, and thermal conduction (κ) decreases and increases with increasing temperature. Except that, electrical conductivity and Seebeck of Mg2Si0.6Sn0.4 are better than Mg2Si0.4Sn0.6 made by the same method. The properties of Mg2Si0.4Sn0.6 sintered at 1023 K, is better than the one at 973 K. The maximum zT of Mg2Si0.4Sn0.6 is 0.086 at 573 K.

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.

Production of Micro Crystalline Cellulose from Tapioca Solid Waste: Effect of Acid Concentration on its Physico-chemical Properties

2020 ◽  
Vol 23 (5) ◽  
pp. 147-151
Author(s):  
Ansharullah Ansharullah ◽  
Nur Muhammad Abdillah Saenuddin ◽  
RH Fitri Faradilla ◽  
Asranuddin Asranudin ◽  
Asniar Asniar ◽  
...  
Keyword(s):  
Solid Waste ◽  
Water Solubility ◽  
Chemical Properties ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Crystalline Cellulose ◽  
Cellulose Content ◽  
X Ray Diffraction ◽  
Physico Chemical ◽  
Ft Ir

This study was aimed to examine the production of microcrystalline cellulose (MCC) from tapioca solid waste (TSW), using HCl hydrolysis with various concentrations, i.e., 2 N, 2.5 N, 3 N, and 3.5 N. MCC was produced by delignifying the TSW with NaOH 20%, and bleaching with NaOCl 3.5% to produce α-cellulose, and subsequently hydrolyzing α-cellulose with three different HCl concentrations to produce MCC. The physicochemical properties of MCC were then analyzed, including Scanning Electron Micrograph (SEM), X-ray diffraction (XRD), and FTIR spectra. The results showed that hydrolysis with 2.0 N HCl resulted in a higher yield of 61.28%, α-cellulose content of 56.33%, moisture 6.25%, pH of 6.54; ash 0.23%, and water solubility 0.34%. SEM analysis showed the morphology and size of the MCC produced were like those of a commercial MCC (Avicel PH101), while the XRD analysis showed the higher concentration of HCl gave rise to an increased crystalline index. FT-IR spectrum analysis indicated that TSW, MCC produced, and commercial MCC had similar functional groups.

The Research of a New Purifying Agent on Synthesis and Performance

2011 ◽  
Vol 197-198 ◽  
pp. 865-869
Author(s):  
Xia Zhao ◽  
Yang Li Zhao ◽  
Hui Xia Feng ◽  
He Ming Luo ◽  
Gang Xie ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Guar Gum ◽  
Chloroacetic Acid ◽  
Basic Material ◽  
Polluted Water ◽  
Potential Applications ◽  
And Performance ◽  
Turbidity Ratio ◽  
Experiment Analysis ◽  
Better Than

This paper synthesis a new purifying agent on a rapid semidry process, using a natural guar gum as basic material, which was carboxymethyl guar. The factors which affect degree of substitution (DS) of carboxymethyl guar, such as the reaction temperature, the reaction time, the consumption of chloroacetic acid, and the consumption of sodium hydroxide etc were studied. The best synthesis condition was concluded. The flocculating property of the produced purifying agent was studied. Then the experiment analysis the structure and thermal stability through IR and DTA. The experiment results showed that the turbidity ratio of the micro-polluted water was better than other purifying agents. The synthetic purifying agent should have potential applications in the wastewater market.

Preparation of O-Carboxymethyl Chitosan by Schiff Base and Antibacterial Activity

2013 ◽  
Vol 647 ◽  
pp. 794-797 ◽  
Author(s):  
Ying Liu ◽  
Di Zhao ◽  
Jiang Tao Wang
Keyword(s):  
Schiff Base ◽  
Elemental Analysis ◽  
Chloroacetic Acid ◽  
Antimicrobial Activities ◽  
Carboxymethyl Chitosan ◽  
Ft Ir ◽  
Novel Method ◽  
And Staphylococcus Aureus ◽  
Better Than ◽  
Ft Ir Spectroscopy

A novel method of preparation O-Carboxymethyl chitosan (OCMC) was studied that the product was prepared by reaction of Schiff's base of chitosan. Schiff base of chitosan (BCTS) was synthesized by the reaction of chitosan with aromatic aldehyde, then BCTS reacted with chloroacetic acid and removed the group of amino protection to get the target product. The chitosan derivative was characterized by FT-IR spectroscopy, 1HNMR and elemental analysis. Elemental analysis results confirmed that the degree of substitution(DS) of OCMC was 0.83. Solubility of OCMC in water and organic solvents was demonstrated to be better than that of chitosan. The antimicrobial activities of chitosan and OCMC were investigated against Aspergillus niger and Staphylococcus aureus. The results indicate that the antimicrobial activity of OCMC was superior to chitosan.

Application Fuzzy Logic System for Accurate Sheet Trim Shower Position

2019 ◽  
Vol 3 (1) ◽  
pp. 186-192
Author(s):  
Yudi Wibawa
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Dc Motor ◽  
Automation System ◽  
Paper Making ◽  
System A ◽  
Accurate Position ◽  
And Performance ◽  
Better Than ◽  
Logic System

This paper aims to study for accurate sheet trim shower position for paper making process. An accurate position is required in an automation system. A mathematical model of DC motor is used to obtain a transfer function between shaft position and applied voltage. PID controller with Ziegler-Nichols and Hang-tuning rule and Fuzzy logic controller for controlling position accuracy are required. The result reference explains it that the FLC is better than other methods and performance characteristics also improve the control of DC motor.

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