scholarly journals New sorbents for electrochromatography based on polymer-inorganic dielectric composites

2021 ◽  
Vol 2103 (1) ◽  
pp. 012124
Author(s):  
A Y Shmykov ◽  
S V Mjakin ◽  
N A Bubis ◽  
L M Kuztetzov ◽  
N A Esikova ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Filler Content ◽  
Structural Features ◽  
Polymer Binder ◽  
Dielectric Losses ◽  
Infinite Cluster ◽  
Confocal Scanning ◽  
Scanning Electron

Abstract Oligomeric diisocyanate based coatings with different contents of barium titanate (BaTiO3) submicron sized particles as a ferroelectric filler are synthesized on poly(dimethylsiloxane) (PDMS) supports. The study of thus obtained coatings using confocal scanning electron microscopy allowed the characterization of their morphology and features of BaTiO3 particles distribution in the polymer binder, including the determination of threshold filler contents corresponding to the formation of an infinite cluster, matrix-island and chain-like structures as well as the percolation. Dielectric permittivity and dielectric losses of the composites are measured and studied depending on BaTiO3 filler content and relating structural features.

scholarly journals Synthesis and characterization of four new lanthanide complexes coordinate with β-diketone ligands and 1,10-phenanthroline or 2,2-dipyridine

2020 ◽  
Vol 9 (11) ◽  
pp. e45791110207
Author(s):  
Yuri Johann Vilar de Brito ◽  
Crislene Rodrigues da Silva Morais ◽  
Yohanna Jamilla Vilar de Brito ◽  
Daniella Cibele Bezerra
Keyword(s):  
Electron Microscopy ◽  
Lanthanide Complexes ◽  
Synthesis And Characterization ◽  
Direct Reaction ◽  
Scanning Calorimetry ◽  
Solubility Test ◽  
Microscope Images ◽  
Scanning Electron

In this work the complexes Ln(β-dik)3L (where Ln= Nd+3 e Er+3, β-dik= 4,4,4-trifluoro-1-phenyl-1,3-butanedione (Btfa) and L= 1,10-Phenanthroline (Phen) or 2,2’-Bipyridyl (Bipy)), were synthesized from the direct reaction of LnCl3 with β-diketone and the ligands. The purpose was to create new lanthanide complexes with perspectives of use in markers. After the syntheses, the complexes were characterized by Solubility Test, Scanning Electron Microscopy (SEM) and the thermal properties of compounds were studied using Thermogravimetry Analisys (TGA), Differential Scanning Calorimetry (DSC) and Determination of Melting/Decomposition Intervals. Based on the verified properties, the solubility test found that the complexes are not soluble in chloroform and water. The microscope images showed an excellent crystallization of the complexes. The complexes are stable up to 120°C, after this temperature they show a peak in the DSC referring to the fusion and the beginning of decomposition. The values of activation energy suggests the following decreasing order of stability: Er(Btfa)3Phen>Nd(Btfa)3Phen>Er(Btfa)3Bipy>Nd(Btfa)3Bipy.

Crystallite Size and Magnetic Properties of HDDR Powders Obtained from PrFeCoBNb Alloys

2010 ◽  
Vol 660-661 ◽  
pp. 308-313
Author(s):  
S.C. Silva ◽  
José Hélio Duvaizem ◽  
Rubens Nunes de Faria Jr. ◽  
Hidetoshi Takiishi
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Magnetic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystallite Sizes ◽  
Phase Quantification ◽  
Scanning Electron

The first goal of this work involved the study of HDDR powders obtained from annealed alloys with the general formula: PrxFe77.9-xCo16B6Nb0.1 (x = 12; 12.5; 13; 13.5 and 14). The alloys were processed at desorption / recombination temperature of 840°C. The highest magnetic properties were obtained with 13.5 at. % Pr (Br= 1000mT and µ0iHc= 890mT). The alloy with a minimum praseodymium content (12 at. %) exhibited the lowest magnetic properties (Br= 350mT e iHc= 120mT). The second aim of the work involved the characterization of HDDR powders using X-ray diffraction for phase quantification and mean crystallite sizes determination of the hard magnetic phase. The processed powders were characterized by scanning electron microscopy (SEM).

Preparation and Characterization of Polypropylene Biocomposites Reinforced Palm Fruitlet Fiber

2013 ◽  
Vol 795 ◽  
pp. 281-285
Author(s):  
M. Muhammad Safwan ◽  
S.K. Sakhti ◽  
Hui Lin Ong ◽  
Md Akil Hazizan ◽  
M.K. Anis Sofiah ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Interfacial Adhesion ◽  
Smooth Surface ◽  
Filler Content ◽  
Sem Analysis ◽  
The Other ◽  
Scanning Electron

Polypropylene (PP) biocomposite containing 5, 10, 15, 20 and 25wt% of sodium hydroxide treated palm fruitlet fiber (TPFF) were prepared using Z-blade at 180°C at 50rpm. The composite was introduced with 3wt % of maleated anhydride grafted polypropylene (PP-g-MAH) as compatibilizer. The composites were characterized by performing tensile test and scanning electron microscopy (SEM) analysis. Results indicated that, the present of PP-g-MAH improved the tensile strength as the increasing of treated filler content. The improvement properties of the composite were attributed to better interfacial adhesion between the PFF and PP matrix in the presence of the PP-g-MAH. As for the overall results,5wt% TPFF/PP/PP-g-MAH composite shows the highest value tensile strength, 20wt% TPFF/PP/PP-g-MA composite exhibits the highest in Youngs modulus. While from the observation through SEM, the smooth surface fractured of 5wt% TPFF/PP/PP-g-MA which indicated as high rigidity compare to the other ratios.

Characterization of CMOS Structures (0.6 µm process) Submitted to HBM and COM ESD Stress Tests

1997 ◽  
Author(s):  
G. Meneghesso ◽  
E. Zanoni ◽  
P. Colombo ◽  
M. Brambilla ◽  
R. Annunziata ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrostatic Discharge ◽  
Stress Test ◽  
Complete Characterization ◽  
Stress Tests ◽  
Test Procedures ◽  
Emission Microscopy ◽  
Fast Rise ◽  
Scanning Electron

Abstract In this work, we present new results concerning electrostatic discharge (ESD) robustness of 0.6 μm CMOS structures. Devices have been tested according to both HBM and socketed CDM (sCDM) ESD test procedures. Test structures have been submitted to a complete characterization consisting in: 1) measurement of the tum-on time of the protection structures submitted to pulses with very fast rise times; 2) ESD stress test with the HBM and sCDM models; 3) failure analysis based on emission microscopy (EMMI) and Scanning Electron Microscopy (SEM).

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