IN SITU TEMPLATE SYNTHESIS OF PoPD–TiO2 NANOCOMPOSITES FOR ACTIVE ANTI-CORROSIVE COATINGS ON 316L SS

2011 ◽  
Vol 10 (04n05) ◽  
pp. 1147-1152 ◽  
Author(s):  
P. MUTHIRULAN ◽  
N. RAJENDRAN
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Impedance ◽  
Material Loss ◽  
Transmission Electron ◽  
Corrosion Studies ◽  
Protective System ◽  
Ft Ir ◽  
Eis Measurements ◽  
Thermal Stability Of

Corrosion is one of the major destruction processes involved in material loss, and its prevention is paramount in protecting investments. The present work shows a new contribution to the design of a new protective system based on poly(orthophenylenediamine) (PoPD)–nano- TiO2 composites. The structure and properties of PoPD– TiO2 nanocomposites were characterized by Fourier transform infrared spectroscopy (FT-IR), Cyclicvoltammetry (CV), Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) techniques. Thermal stability of the composite was studied by Thermogravimetric analysis (TGA). The anti-corrosion behavior of PoPD– TiO2 nanocomposites has been investigated in 3.5 wt.% NaCl solution using potentiodynamic polarization and electrochemical impedance spectroscopic (EIS) measurements. Corrosion studies revealed that PoPD– TiO2 nanocomposites coating exhibited excellent anti-corrosive properties compared with PoPD coated and uncoated 316L SS.

Preparation, characterization, and properties of polystyrene/Na-montmorillonite composites

2018 ◽  
Vol 32 (8) ◽  
pp. 1078-1091 ◽  
Author(s):  
Sibel Erol Dağ ◽  
Pınar Acar Bozkurt ◽  
Fatma Eroğlu ◽  
Meltem Çelik
Keyword(s):  
Electron Microscopy ◽  
Interlayer Spacing ◽  
Decomposition Temperature ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Sem Images ◽  
Specific Pore Volume ◽  
Transmission Electron ◽  
Thermal Stability Of

A series of polystyrene (PS)/unmodified Na-montmorillonite (Na-MMT) composites were prepared via in situ radical polymerization. The prepared composites were characterized using various techniques. The presence of various functional groups in the unmodified Na-MMT and PS/unmodified Na-MMT composite was confirmed by Fourier transform infrared spectroscopy. Morphology and particle size of prepared composites was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). According to the XRD and TEM results, the interlayer spacing of MMT layers was expanded. SEM images showed a spongy and porous-shaped morphology of composites. TEM revealed the Na-MMT intercalated in PS matrix. The thermal stability of PS/unmodified Na-MMT composites was significantly improved as compared to PS, which is confirmed using thermogravimetric analysis (TGA). The TGA curves indicated that the decomposition temperature of composites is higher at 24–51°C depending on the composition of the mixture than that of pure PS. The differential scanning calorimetry (DSC) results showed that the glass transition temperature of composites was higher as compared to PS. The moisture retention, water uptake, Brunauer–Emmett–Teller specific surface area, and specific pore volume of composites were also investigated. Water resistance of the composites can be greatly improved.

Thermal stability of laser-induced modified volumes in Si as studied by in situ and ex situ heating experiments

Microscopy ◽  
2018 ◽  
Vol 67 (2) ◽  
pp. 112-120
Author(s):  
Hiroyasu Saka ◽  
Hiroyuki Iwata ◽  
Daisuke Kawaguchi
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Laser Beam ◽  
Ex Situ ◽  
Dislocation Theory ◽  
Tail Region ◽  
Transmission Electron ◽  
Thermal Stability Of

Abstract Radiation of a permeable laser beam into Si induces considerable modification of structures. Thermal stability of the laser-induced modified volumes (LIMV’s) was studied comprehensively by means of in situ and ex situ heating experiments using transmission electron microscopy. The behavior in the tail region of a LIMV can be understood by dislocation theory, while that of a void formed at the very focus of a laser beam cannot be understood easily.

Cross-sectional TEM and corrosion studies of Al and N implanted copper

1987 ◽  
Vol 93 ◽  
Author(s):  
E. Gerritsen ◽  
H. J. Ligthart ◽  
T. E. G. Deenen
Keyword(s):  
Electron Microscopy ◽  
High Dose ◽  
Copper Sulphide ◽  
Cross Sectional ◽  
Damage Layer ◽  
Implantation Damage ◽  
Transmission Electron ◽  
Corrosion Studies ◽  
Copper Single Crystals

ABSTRACTPoly- and single crystalline copper was implanted with aluminium and nitrogen at doses ranging from 1016 to 5 × 1017 at/cm2 and energies of 170 keV. The corrosion resistance of the implanted surfaces was tested by exposure to an H25-containing atmosphere. The amount of copper sulphide formed was measured by chrono potentiometric reduction. The amount of corrosion products was markedly reduced (up to a factor 50) by high dose implantations of aluminium. The microstructure of the implanted copper was examined by Transmission Electron Microscopy of cross-sectioned specimens. A deep damage layer far exceeding the ion range was observed. XTEM-pictures of aluminium implanted copper single crystals of various orientations suggest a channeling mechanism for this deep damage layer. In situ annealing of the specimens in the TEM showed that most of the implantation damage is removed at 600°C except for an array of dislocations at the end of the damage range.

Modification of clays with styrenic ionic liquid by Synthesis of in-situ Polystyrene Nanocomposite

e-Polymers ◽  
2013 ◽  
Vol 13 (1) ◽  
Author(s):  
Mohammad Galehassadi ◽  
Fatemeh Hosseinzadeh ◽  
Mehrdad Mahkam
Keyword(s):  
Electron Microscopy ◽  
Ionic Liquid ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Modified Montmorillonite ◽  
Transmission Electron ◽  
Insitu Polymerization ◽  
Thermal Stability Of

Abstract Nanocomposites of polystyrene (PS) was prepared with new styrenic ionic liquid, N-(4-vinyl benzyl)-(N,N-dimethylamino) pyridinium chloride[VBMAP], surfactants used as organic modifications for the clays. Sodium montmorillonite (Na-MMT) was successfully modified by [VBMAP] to become OMMT through cation exchange technique which is shown by the increase of basalspacing of clay by XRD. The composite material based on polystyrene and organo-modified montmorillonite (OMMT) was prepared by insitu polymerization and characterized. The morphology of the polymer/clay hybrids was evaluated by X-ray diffraction (XRD) ,transmission electron microscopy (TEM) and scanning electron microscopy (SEM), showing good overall dispersion of the clay. The thermal stability of the polymer/clay nanocomposites were enhanced, as evaluated by thermogravimetric analysis.

scholarly journals Thermal stability of CsPbBr3 perovskite as revealed by in situ transmission electron microscopy

APL Materials ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 071110 ◽  
Author(s):  
Chao Zhang ◽  
Joseph F. S. Fernando ◽  
Konstantin L. Firestein ◽  
Joel E. von Treifeldt ◽  
Dumindu Siriwardena ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Transmission Electron ◽  
Thermal Stability Of

Synthesis and Densification of Nanometric Ce0.8Sm0.2O1.9-δ

2006 ◽  
Vol 972 ◽  
Author(s):  
Vincenzo Esposito ◽  
Marco Fronzi ◽  
Enrico Traversa
Keyword(s):  
Electron Microscopy ◽  
Liquid Phase ◽  
Electrochemical Impedance ◽  
Liquid Phase Sintering ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Conventional Sintering ◽  
Eis Measurements ◽  
Co Precipitation

AbstractNanometric 20% molar Sm-doped ceria (SDC20) powders were synthesized by tetrametylethylen ammine (TMDA) co-precipitation method. SDC20 was sintered in several conditions to control the final microstructure. Fast firing and conventional sintering were performed. LiNO3was used as an additive to promote liquid phase sintering of ceria at low temperatures (900-1200°C). Powders and dense pellets were analysed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). Electrochemical impedance spectroscopy (EIS) measurements were performed on dense pellets in air to estimate the contribution of grain boundary and bulk to the electrical conductivity. Liquid phase sintering produced the densest samples with the highest conductivity.

Synthesis, Characterization and Thermal Analysis of Rod-Shaped Polyaniline-Barium Ferrites Nanocomposites

2010 ◽  
Vol 150-151 ◽  
pp. 386-390
Author(s):  
Yuan Xun Li ◽  
Ying Li Liu ◽  
Huai Wu Zhang ◽  
Wei Wei Ling
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Barium Ferrite ◽  
In Situ Polymerization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Barium Ferrites ◽  
Thermal Stability Of

The rod-shaped polyaniline (PANI)-barium ferrite nanocomposites were synthesized by in situ polymerization of aniline in the presence of BaFe12O19 nanoparticles with diameters of 60-80 nm. The composites obtained were characterized by infrared spectra (IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The thermal stability and the composition of the composites were investigated by TG-DTG analysis. The results indicate that the thermal stability of the composites is higher than that of the pure PANI which can be attributed to the interactions existed between PANI chains and ferrite particles.

EFFECT OF RUTHENIUM (III) INCORPORATION IN POLYANILINE BACKBONE: MATERIALS FOR SUPERCAPACITIVE ENERGY STORAGE APPLICATION

NANO ◽  
2013 ◽  
Vol 08 (03) ◽  
pp. 1350026 ◽  
Author(s):  
SOUMEN GIRI ◽  
DEBASIS GHOSH ◽  
CHAPAL KUMAR DAS
Keyword(s):  
Electron Microscopy ◽  
Oxidative Polymerization ◽  
Electrochemical Characterizations ◽  
Electrode System ◽  
Transmission Electron ◽  
Raman Study ◽  
Ft Ir ◽  
Doped Polyaniline ◽  
Metal Incorporation

HCl doped polyaniline (PANI) and Ru (III) doped polyaniline ( Ru /PANI) have been successfully prepared by in situ oxidative polymerization method and the effect of transition metal incorporation in PANI backbone is investigated thoroughly by the execution of Fourier transform infrared spectroscopy (FT-IR) and Raman study. Moreover, to examine the change in surface and bulk morphology of the composites, the field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) have also been carried out, which revealed the agglomerated state of PANI after being Ru doped. The confirmation of the presence of Ru in the composite is achieved by the energy dispersive X-ray spectroscopy (EDS). Also, the electrochemical characterizations namely, cyclic voltammetry (CV), ac impedance spectroscopy (EIS), cyclic charge–discharge (CCD), of the composite was performed by conventional three-electrode system using 1 M H2SO4 electrolyte. On doping with Ru , an increment of specific capacitance of PANI from 160 F/g to 425 F/g has been achieved with a considerable increase in cycle stability.

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