Surface Encapsulation of Nano-CaCO3 Particle by In Situ Emulsion Polymerization

2008 ◽  
Vol 58 ◽  
pp. 163-167
Author(s):  
Ming Shan Yang ◽  
Ying Quan
Keyword(s):  
Electron Microscopy ◽  
Emulsion Polymerization ◽  
Electron Spectroscopy ◽  
Nano Particles ◽  
Core Shell ◽  
Organic Complex ◽  
Caco3 Nanoparticles ◽  
Transmission Electron ◽  
In Situ Emulsion Polymerization

The nano-CaCO3/polyacrylate core-shell inorganic-organic complex nano-particles were prepared by in situ emulsion polymerization based on fresh slush pulp of calcium carbonate (CaCO3) nanoparticles in this paper. The dispersion and encapsulation of nanoparticles were investigated by transmission electron microscopy (TEM) and electron spectroscopy for chemical analysis(ESCA). The results showed that in the presence of nano-CaCO3 particles, the in situ emulsion polymerization of acrylates was carried out smoothly, and polyacrylates successfully encapsulated on the surface of nano-CaCO3.

High Magneto-Crystalline Anisotropic Core–Shell Structured Mn0.5Zn0.5Fe2O4/Polyaniline Nanocomposites Prepared by in Situ Emulsion Polymerization

2012 ◽  
Vol 116 (9) ◽  
pp. 5277-5287 ◽  
Author(s):  
M. Abdullah Dar ◽  
R. K. Kotnala ◽  
Vivek Verma ◽  
Jyoti Shah ◽  
W. A. Siddiqui ◽  
...  
Keyword(s):  
Emulsion Polymerization ◽  
Core Shell ◽  
In Situ Emulsion Polymerization

In situ TEM observation of Au–Cu2O core–shell growth in liquids

Nanoscale ◽  
2019 ◽  
Vol 11 (21) ◽  
pp. 10486-10492 ◽  
Author(s):  
Fu-Chun Chen ◽  
Jui-Yuan Chen ◽  
Ya-Hsuan Lin ◽  
Ming-Yu Kuo ◽  
Yung-Jung Hsu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Shell Growth ◽  
Core Shell ◽  
In Situ Tem ◽  
Shell Nanoparticles ◽  
Transmission Electron ◽  
Liquid Cell ◽  
Different Shapes ◽  
Core Shell Nanoparticles

The formation of different shapes Au–Cu2O core–shell nanoparticles was investigated by in situ liquid cell transmission electron microscopy (LCTEM).

scholarly journals Synthesis and Characterization of Conducting PANDB/χ-Al2O3 Core-Shell Nanocomposites by In Situ Polymerization

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2787
Author(s):  
Cheng-Ho Chen ◽  
Ying-Chen Lin ◽  
Fu-Su Yen
Keyword(s):  
Electron Microscopy ◽  
In Situ Polymerization ◽  
Weight Ratio ◽  
Core Shell ◽  
Sem Images ◽  
Dodecylbenzenesulfonic Acid ◽  
Blend Film ◽  
Transmission Electron

Polyaniline doped with dodecylbenzenesulfonic acid/χ-aluminum oxide (PANDB/χ-Al2O3) conducting core-shell nanocomposites was synthesized via an in situ polymerization method in this study. PANDB was synthesized in the presence of dodecylbenzenesulfonic acid (DBSA), which functioned as a dopant and surfactant. The electrical conductivity of the conducting PANDB/χ-Al2O3 core-shell nanocomposite was approximately 1.7 × 10−1 S/cm when the aniline/χ-Al2O3 (AN/χ-Al2O3) weight ratio was 1.5. The transmission electron microscopy (TEM) results indicated that the χ-Al2O3 nanoflakes were thoroughly coated by PANDB to form the core-shell (χ-Al2O3-PANDB) structure. The TEM and field-emission scanning electron microscopy (FE-SEM) images of the conducting PANDB/χ-Al2O3 core-shell nanocomposites also indicated that the thickness of the PANDB layer (shell) could be increased as the weight ratio of AN/χ-Al2O3 was increased. In this study, the optimum weight ratio of AN/χ-Al2O3 was identified as 1.5. The conducting PANDB/χ-Al2O3 core-shell nanocomposite was then blended with water-based polyurethane (WPU) to form a conducting WPU/PANDB/χ-Al2O3 blend film. The resulting blend film has promising antistatic and electrostatic discharge (ESD) properties.

Preparation of High-Rigidity, High-Toughness Unplasticized Poly(vinyl Chloride) for Plastic Windows Profiles Reinforced and Toughened by Nano-CaCO3

2011 ◽  
Vol 71-78 ◽  
pp. 1237-1241
Author(s):  
Ming Shan Yang ◽  
Lin Kai Li
Keyword(s):  
Electron Microscopy ◽  
Vinyl Chloride ◽  
Sem Analysis ◽  
Nano Particles ◽  
Inorganic Complex ◽  
Poly Vinyl Chloride ◽  
Transmission Electron ◽  
Large Fiber ◽  
Acrylate Polymer

The organic-inorganic complex nano-particles with core-shell structure were synthesized by in situ emulsion polymerization based on fresh slush pulp of calcium carbonate (CaCO3) nanoparticles and acrylate polymer in this paper. The dispersion and encapsulation of nanoparticles were investigated by transmission electron microscopy (TEM). Unplasticized poly(vinyl chloride)(UPVC) was modified by organic-inorganic complex nanoparticles and the effects of toughening and reinforcing were systematically studied. The results showed that the effects of the reinforcement and toughening of organic-inorganic complex nanoparticles on UPVC were very significant. Especially, scanning electron microscopy(SEM) analysis results indicated that large-fiber drawing and network morphologies coexisted in the system of UPVC by joint modification of nanoparticles with CPE.

Preparation and characterization of a copper@polyimide core–shell structure via an in situ induction/imidization route

2016 ◽  
Vol 29 (5) ◽  
pp. 569-574
Author(s):  
Haoran Zhou ◽  
Dexin Wang ◽  
Chunyan Qu ◽  
Changwei Liu ◽  
Shanshan Mao
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Amic Acid ◽  
Core Shell ◽  
Oxidation Reactions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Pure Cu

Based on the combination of an in situ induction and imidization method for improving the interface bonding of an inorganic material and a polymer, copper@polyimide (Cu@PI) core–shell composite particles have been successfully prepared from poly(amic acid) ammonium salts (PAAS) and a Cu complex via a simple solvothermal process. The structures and the morphologies of the samples were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy (TEM), respectively. It was found that PAAS formed PI via a thermal imidization and subsequently precipitated in the solvent. Through crystallization induction, it then successfully coated on the surface of the formed Cu particles. Based on thermo gravimetric analyses curves and due to no Cu oxidation reactions taking place in the core coated with high-temperature-resistant PI, the weight increase was determined to be 106.4%, instead of up to 124.0% in samples consisting of pure Cu.

scholarly journals Effect of High-Density Nanoparticles on Recrystallization and Texture Evolution in Ferritic Alloys

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 172 ◽  
Author(s):  
Eda Aydogan ◽  
Connor Rietema ◽  
Ursula Carvajal-Nunez ◽  
Sven Vogel ◽  
Meimei Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Texture Evolution ◽  
Fiber Texture ◽  
High Density ◽  
Nano Particles ◽  
Ferritic Alloys ◽  
Fecral Alloy ◽  
Transmission Electron

Ferritic alloys are important for nuclear reactor applications due to their microstructural stability, corrosion resistance, and favorable mechanical properties. Nanostructured ferritic alloys having a high density of Y-Ti-O rich nano-oxides (NOs < 5 nm) are found to be extremely stable at high temperatures up to ~1100 °C. This study serves to understand the effect of a high density of nano-particles on texture evolution and recrystallization mechanisms in ferritic alloys of 14YWT (14Cr-3W-0.4Ti-0.21Y-Fe wt %) having a high density of nano-particles and dispersion-free FeCrAl (13Cr-5.2Al-0.05Y-2Mo-0.2Si-1Nb wt %). In order to investigate the recrystallization mechanisms in these alloys, neutron diffraction, electron backscattered diffraction, and in situ and ex situ transmission electron microscopy have been utilized. It has been observed that even though the deformation textures of both the 14YWT and FeCrAl alloys evolved similarly, resulting in either the formation (in FeCrAl alloy) or increase (in 14YWT) in γ-fiber texture, the texture evolution during recrystallization is different. While FeCrAl alloy keeps its γ-fiber texture after recrystallization, 14YWT samples develop a ε-fiber as a result of annealing at 1100 °C, which can be attributed to the existence of NOs. In situ transmission electron microscopy annealing experiments on 14YWT show the combination and growth of the lamellar grains rather than nucleation; however, the recrystallization and growth kinetics are slower due to NOs compared to FeCrAl.

Effect of Zinc Ion on the Electrochemical and Thermal Performance of Polyaniline/Activated Carbon Composites Prepared by In Situ Emulsion Polymerization

2013 ◽  
Vol 721 ◽  
pp. 8-11
Author(s):  
Chen Li ◽  
Yan Hong Tian ◽  
Xue Jun Zhang
Keyword(s):  
Electron Microscopy ◽  
Activated Carbon ◽  
Emulsion Polymerization ◽  
Xrd Analysis ◽  
Zinc Ion ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Ft Ir ◽  
Fourier Transform Ir

Using dodecyl benzenesulfonic acid (DBSA) as surfactant, composites of polyaniline (PANI)/activated carbon (AC) with core-shell structures were prepared by in situ emulsion polymerization in the presence of different concentrations of zinc ion. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis and Fourier-transform IR (FT-IR) spectroscopy were used to analyze morphologies and structures of the composites. Thermal stability of the composites was investigated by thermogravimetric analysis (TGA).The electrochemical properties of PANI/AC composites were studied by galvanostatic charge/discharge tests. The composites exhibited different electrochemical and thermal behavior, which was found to be a function of the concentration of zinc ion.

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