Prepared Patterned Magnetic Composite Microspheres by Emulsion Polymerization

2014 ◽  
Vol 556-562 ◽  
pp. 105-108 ◽  
Author(s):  
Rong Yin ◽  
Ji Li Zhao
Keyword(s):  
Emulsion Polymerization ◽  
Membered Ring ◽  
Magnetic Composite ◽  
Magnetic Composites ◽  
Composite Microspheres ◽  
Straight Line ◽  
Measurement Results ◽  
Magnetic Action ◽  
Ft Ir ◽  
And Performance

The patterned magnetic composite microspheres with Fe3O4as core and styrene polymer as shell have been prepared by emulsion polymerization, while the size of microspheres is about 150-200nm. The composite microspheres were characterized by FT-IR, TEM, and TG et al. The measurement results showed that: the magnetic composites were orderly arranged to form a straight line, rhombus, triangle, five-rings-shaped, plum-shaped, six-membered ring geometry by own magnetic action. The structure of microspheres was spherical, the size was uniform and performance is stable.

Preparation of Polystyrene / Fe3O4 Magnetic Composite Microspheres

2014 ◽  
Vol 1051 ◽  
pp. 148-152
Author(s):  
Rong Yin ◽  
Ji Li Zhao ◽  
Yan Ru Wang ◽  
Xian Zhi Zou
Keyword(s):  
Acrylic Acid ◽  
Magnetite Nanoparticles ◽  
Miniemulsion Polymerization ◽  
Homogeneous Distribution ◽  
Magnetic Composite ◽  
Hydrophilic Property ◽  
Composite Microspheres ◽  
Silane Coupling ◽  
Morphology And Structure ◽  
Ft Ir

Polystyrene/Fe3O4composite microspheres were prepared by miniemulsion polymerization. The composite microspheres comprised of polystyrene core and magnetite nanoparticles as shell. Magnetite is modified with silane coupling to modify strong hydrophilic property, for a function of co-stabilizer. Acrylic acid as a co-monomer was employed to link polymer with magnetite nanoparticles. The microspheres were homogeneous distribution, The thickness of the shell was from10nm to 25nm. The morphology and structure of the composite microspheres were characterized by FT-IR, TEM, XRD, TG and XPS et al. The Effects of co-monomer, auxiliary emulsifier, emulsifier on the composite microspheres have been discussed.

scholarly journals Fabrication of Polystyrene/Detonation Nanographite Composite Microspheres with the Core/Shell Structure via Pickering Emulsion Polymerization

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Hou Xuemei ◽  
Ying Hao
Keyword(s):  
Emulsion Polymerization ◽  
Spherical Shape ◽  
Pickering Emulsion ◽  
Thermal Polymerization ◽  
Formation Mechanisms ◽  
Uniform Size ◽  
Graphite Particles ◽  
Composite Microspheres ◽  
Pickering Emulsion Polymerization ◽  
Ft Ir

Polystyrene microspheres coated with detonation nanographite particles have been prepared by Pickering emulsion polymerization using azobisisobutylonitrile (AIBN) as initiator in aqueous solutions. In the present techniques, the pristine detonation nano-graphite particles were employed as stabilizer of Pickering emulsion and then were armored on the as-prepared polystyrene cores by the thermal polymerization. The composite microspheres of polystyrene/detonation nano-graphite (PS/DNG) were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TGA-DTA), and Fourier transformation infrared spectrum (FT-IR). FE-SEM indicates that the resulting samples retain spherical shape, with the uniform size ranging from 100 to 150 μm and good dispersity. FT-IR presents the possible formation mechanisms of PS/DNG composites. The functional groups on the surface of polystyrene and modified detonation nano-graphite particles have played an important role for the formation of PS/DNG composites. Moreover, the wettability of different nano-graphite was also tested.

scholarly journals Synthesis of Some New Nucleoside Analogues Containing Seven Membered Ring and Studying Their Biological Activity

2016 ◽  
Vol 13 (3) ◽  
pp. 531-546
Author(s):  
Baghdad Science Journal
Keyword(s):  
Antibacterial Activity ◽  
Membered Ring ◽  
Nucleoside Analogues ◽  
Second Step ◽  
Gram Negative Bacteria ◽  
Gram Negative ◽  
The Third ◽  
Ft Ir ◽  
Fourth Step ◽  
Propiolic Acid

In this work, a series of new Nucleoside analogues (D-galactopyranose linked to oxepanebenzimidazole moiety) was synthesized via multisteps synthesis. The first step involved preparation of two benzimidazoles 2-styrylbenzimidazole and 2-(phenyl ethynyl) benzimidazole via reaction of phenylenediamine with cinnamic acid or ?-phenyl propiolic acid. Electrophilic addition of the prepared benzimidazoles by three anhydrides in the second step afforded (4-6) and (14-16) which in turn were treated with 1,2,3,4-di-O-isopropylidene galactopyranose in the third step to afford a series of the desirable protected nucleoside analogues (7-9) ,(17-19)which after hydrolysis in methanolic sodium methoxidein the fourth step afforded the free nucleoside analogues (10-12) and (20-22) .The synthesized compounds were identified by FT-IR and some of them by 1H-NMR and13C-NMR. The synthesized oxepane nucleoside analogues were screened for their antibacterial activity against three types of bacteria including Staphylococcusaureus ,Bacillus(gram positive) andE.coli (gram negative) bacteria repectively.

scholarly journals Low-frequency complex magnetic susceptibility of magnetic composite microspheres in colloidal dispersion

2007 ◽  
Vol 311 (1) ◽  
pp. 145-149 ◽  
Author(s):  
Ben H. Erné ◽  
Maria Claesson ◽  
Stefano Sacanna ◽  
Mark Klokkenburg ◽  
Emile Bakelaar ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Low Frequency ◽  
Colloidal Dispersion ◽  
Magnetic Composite ◽  
Composite Microspheres

Preparation and characterization of oxidized starch-graft-poly(styrene-butyl acrylate) latex via emulsion polymerization

2014 ◽  
Vol 34 (7) ◽  
pp. 611-616 ◽  
Author(s):  
Shijie Cheng ◽  
Jun Xu ◽  
Yumin Wu
Keyword(s):  
Emulsion Polymerization ◽  
Butyl Acrylate ◽  
Colloidal Stability ◽  
Graft Copolymerization ◽  
Scanning Calorimetry ◽  
Oxidized Starch ◽  
Ir Transmission ◽  
Ft Ir ◽  
Synthetic Latex

Abstract Oxidized starch-graft-poly(styrene-butyl acrylate) [OS-g-P(St-BA)] latex was synthesized by the graft copolymerization of OS with St and n-butyl acrylate (BA) via emulsion polymerization. The graft copolymers were characterized by Fourier transform infrared (FT-IR), transmission electronic microscopy (TEM), dynamic light scattering, thermogravimetry (TG), and differential scanning calorimetry (DSC). The effects of the amount of OS, monomers, and initiator on graft copolymerization were investigated. Under the optimal conditions, the percentage of graft (PG), grafting efficiency (GE), and ζ potential could reach 256.5%, 41.7%, and -30.1 mV, respectively. The results indicated that the OS grafted onto particles greatly enhanced the colloidal stability of latex. The thermal stability properties of OS-g-P(St-BA) were also improved by the addition of OS. The OS-g-P(St-BA) latex may be used to partly replace the conventional synthetic latex for paper coating.

scholarly journals Temperature and Torque Measurements of Switched Reluctance Actuator with Composite or Laminated Magnetic Cores

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3065
Author(s):  
Marek Przybylski ◽  
Barbara Ślusarek ◽  
Paolo Di Barba ◽  
Maria Evelina Mognaschi ◽  
Sławomir Wiak
Keyword(s):  
Magnetic Flux Density ◽  
Magnetic Composite ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Switched Reluctance ◽  
Loss Analysis ◽  
Steel Sheets ◽  
Soft Magnetic Composite ◽  
Torque Measurements ◽  
Lower Temperature

Soft magnetic composite (SMC) materials made of iron powder are more frequently used in construction of electric actuators and motors because of their advantages with respect to Fe–Si electric steel sheets and because they have almost no powder loss. The study deals with measurements of temperature and torque of a low-power rotary switched reluctance actuator, with reference to a commercial actuator and a prototype actuator characterized by stator and rotor cores made of soft magnetic composite materials. Further power loss analysis was also conducted. To assess the actuators, magnetization characteristics and iron loss vs. magnetic flux density at a given frequency were measured according to IEC standards. Results show that the actuator made of soft magnetic composites exhibits higher efficiency and a lower temperature rise of stator and windings in comparison with the commercial actuator.

Studies of Iron-Doped Carbon Material from Carbonization of Soy Protein/Polyaniline Composite and its Electrical Capacitance

2020 ◽  
Vol 999 ◽  
pp. 13-20
Author(s):  
Qing Wu Zhang ◽  
Tian Fang ◽  
Hao Lu ◽  
Wei Wang ◽  
Qing Qing Zhang ◽  
...  
Keyword(s):  
Carbon Material ◽  
Nitrogen Atmosphere ◽  
Electrical Capacitance ◽  
Protein Gel ◽  
Solution Energy ◽  
Iron Doped ◽  
Good Potential ◽  
Ft Ir ◽  
And Performance ◽  
A Current

Protein gel of soy was formed immediately during polymerization of aniline initiated by certain amount of FeCl3. In order to obtain iron-doped carbon material, this composite was then carbonized at 700°C under nitrogen atmosphere for 5h. SEM, FT-IR, XRD, and isothermal desorption/adsorption technologies were employed to characterize morphology and structure of the material. Electrical capacitance of iron-doped carbon materials and performance of a prototype supercapacitor based on the material as its electrodes were measured by cyclic voltammetry, chronopotentiometry, and A.C. impedance respectively. Results show that morphology of as-obtained material is porous and hierachical, specific surface area of the material is 232.1m2/g, and specific capacitance of the material can reach 475.2F/g in 6 M KOH aqueous solution. Energy density and power density of the cell is 2.1Wh/kg and 2.0kW/kg, respectively. Capacity retention of the device is 100% after 5000 cycles at a current density of 2A/g. The above studies imply that this original iron-doped carbon material will have a good potential application in field of energy storage.

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