scholarly journals Advanced Characterization of Silica–Encapsulated Aluminum Pigments

2019 ◽  
Vol 65 (1) ◽  
pp. 61-71
Author(s):  
Draga Dragnea ◽  
Dragos Gudovan ◽  
Elena Zaharia ◽  
Ion Dragnea ◽  
Costin Sorin Bildea
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Optical Properties ◽  
Electron Diffraction ◽  
Operating Conditions ◽  
Gravimetric Analysis ◽  
Silica Layer ◽  
Physical Methods ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron

For environmental reasons, the paints industry shifts from solvent-borne towards water-borne formulations. This change is challenging the business of aluminum pigments, as the hydrogen released by the reaction of aluminum with water degrades the optical properties, besides being a safety concern. In this work, industrial-grade aluminum pigments are encapsulated, by a well-known method, in a silica matrix by sol-gel process using isopropanol - a more suitable solvent for the industry. The effectiveness of the encapsulation process is proven by advanced physical methods (Scanning Electron Microscopy, Energy Dispersive X-Ray Analysis, Selected Area Electron Diffraction, Fourier Transformed InfraRed Spectroscopy, Thermo-Gravimetric Analysis) and by industry-relevant tests (stability in water, hiding power, flop and granulometry). Moreover, advanced surface-applied physical methods (High Resolution Transmission Electron Microscopy combined with Selected Area Electron Diffraction and Scanning Transmission Electron Microscopy, and FT-IR microscopy) clearly show the homogeneity of the resulting pigments, a quality which is highly desirable for practical applications. The results demonstrate that stability comparable to that of pigments passivized by chromium-based inhibitors is easily achieved, for a variety of operating conditions. However, accomplishing a homogeneous silica layer of the right thickness is the determining factor for good optical properties.

HRTEM Investigation of Precipitates in Al-Zn-In-Mg-Ti-Ce Anode Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 1036-1039
Author(s):  
Jing Ling Ma ◽  
Jiu Ba Wen ◽  
Yan Fu Yan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Electron Diffraction ◽  
Hexagonal Structure ◽  
Orientation Relation ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Scanning Electron

The precipitates of Al-5Zn-0.02In-1Mg-0.05Ti-0.5Ce (wt %) anode alloy were studied by scanning electron microscopy, X-ray microanalysis, high resolution transmission electron microscopy and selected area electron diffraction analyses in the present work. The results show that the alloy mainly contains hexagonal structure MgZn2 and tetragonal structure Al2CeZn2 precipitates. From high resolution transmission electron microscopy and selected area electron diffraction, aluminium, Al2CeZn2 and MgZn2 phases have [0 1 -1]Al|| [1 -10]Al2CeZn2|| [-1 1 0 1]MgZn2orientation relation, and Al2CeZn2 and MgZn2 phases have the [0 2 -1]Al2CeZn2|| [0 1 -10]MgZn2orientation relation.

Synthesis of Bamboo-Shaped Gallium Nitride Nanorods

2005 ◽  
Vol 475-479 ◽  
pp. 3575-3578
Author(s):  
Zhi Zhong Dong ◽  
Haiyong Gao ◽  
Cheng Shan Xue ◽  
Zhi Hua Dong ◽  
Jian Ting He
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fourier Transform ◽  
High Resolution ◽  
Electron Diffraction ◽  
Average Length ◽  
Rf Magnetron Sputtering ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Infrared Spectrophotometer

Heagonal GaN nanorods have been synthesized through ammoniating ZnO/Ga2O3 films deposited by radio frequency(rf) magnetron sputtering on Si(111) substrates.X-ray diffraction(XRD), Fourier transform infrared spectrophotometer (FTIR), transimission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM) and selected-area electron diffraction (SAED) are used to analyze the structure,composition and morphology of the synthesized GaN nanorods. TEM result shows that GaN nanorods own bamboo-shaped morphalogy and have a single-crystal hexagonal wurtzite structure.The average length and dimeter of the nanorods are 3μm and 50 nm espectively.Ga2O3 and NH3 reactived directly and synthesized GaN nanorods without any catalyzer and the process of space-confined reactions.

MICROSTRUCTURE STUDY OF ROD-LIKE NANOCRYSTALLINE RUTILE TiO2 SYNTHESIZED BY SONOCHEMICAL METHOD

2004 ◽  
Vol 03 (06) ◽  
pp. 891-896
Author(s):  
J. M. ZHU ◽  
S. S. HUANG ◽  
G. B. MA ◽  
X. H. ZHU ◽  
S. H. ZHOU ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Electron Diffraction ◽  
Sonochemical Method ◽  
Rutile Tio2 ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron

Rutile TiO 2 nanorods have been successfully prepared by a sonochemical method. The microstructures of TiO 2 nanorods were investigated in detail by transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HREM). Probable mechanisms for the sonochemical formation of TiO 2 nanorods are proposed.

{111}-specific twinning structures in nonstoichiometric ZrC0.6with ordered carbon vacancies

2012 ◽  
Vol 46 (1) ◽  
pp. 43-47 ◽  
Author(s):  
Wentao Hu ◽  
Shaocun Liu ◽  
Bin Wen ◽  
Jianyong Xiang ◽  
Fusheng Wen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Diffraction ◽  
Interfacial Energy ◽  
First Principles ◽  
Great Reduction ◽  
Stacking Fault ◽  
First Principles Calculations ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron

Twinning structures in ordered nonstoichiometric ZrC0.6have been investigated experimentally and theoretically.Viatransmission electron microscopy and selected area electron diffraction measurements, {111}-specific twins have been observed. Interestingly, two special types of twinning interfaces,i.e.(111)Cand (111)Zrinterfaces, are recognized to be formed as a result of the presence of ordered carbon vacancies. In contrast to the high stacking fault energy for twinning formation in stoichiometric ZrC, first-principles calculations indicate that the presence of ordered carbon vacancies leads to a great reduction in the twinning interfacial energy, thus favouring the stabilization of twinning structures in the ordered ZrC0.6.

Self-Precipitated Process of Te Nanowire from Zr-Doped Sb2Te3 Film

2016 ◽  
Vol 848 ◽  
pp. 489-493
Author(s):  
Yong Hui Zheng ◽  
Yan Cheng ◽  
Zhi Tang Song ◽  
Wei Jun Yin ◽  
Min Zhu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Electron Diffraction ◽  
Annealing Process ◽  
Bright Field ◽  
Single Crystalline ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron

By using Zr6.5(Sb2Te3)93.5 film, Te nanowires with a diameter of 5 to 30 nm were fabricated through annealing process. The results of the bright field TEM images, selected area electron diffraction (SAED) and high resolution transmission electron microscopy (HRTEM) demonstrated that the nanowire fitted well with Te hexagonal Te (P3121) structure. The EDS mapping implies that Zr element bonded with Te element and induced the formation of single crystalline Te nanowire during the annealing process.

Hydrothermal Synthesis of Luminescent Wollastonite-CePO4 Nanocomposites

2010 ◽  
Vol 92 ◽  
pp. 125-130
Author(s):  
Ming Guo Ma ◽  
Jie Fang Zhu ◽  
Run Cang Sun
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Electron Diffraction ◽  
Hydrothermal Method ◽  
Powder Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
20 Nm

Luminescent wollastonite-CePO4 nanocomposites have been successfully synthesized using Ca(NO3)2•4H2O, Na2SiO3•9H2O, and CePO4 by hydrothermal method at 200 oC for 24 h. The precursor nanorods with diameters about 20 nm and lengths several micrometers were obtained by hydrothermal treatment, and after calcination at 600 oC for 3h, the precursor nanorods transformed to wollastonite-CePO4 nanocomposites. Considering the experiment result, a possible growth of the precursor nanorods via the rolling mechanism was also proposed. This is the first report about the synthesis of luminescent wollastonite-CePO4 nanocomposites. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectroscopy (EDS), and photoluminescence (PL).

scholarly journals Pseudo-monocrystalline properties of cylindrical nanowires confinedly grown by electrodeposition in nanoporous alumina templates

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 13817-13826 ◽  
Author(s):  
Enrique Díaz Barriga-Castro ◽  
Javier García ◽  
Raquel Mendoza-Reséndez ◽  
Víctor M. Prida ◽  
Carlos Luna
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Diffraction ◽  
Single Crystal ◽  
Nanoporous Alumina ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Nanoporous Alumina Templates

Four different cylindrical nanowires systems with single-crystal-like properties have been characterized by transmission electron microscopy and selected area electron diffraction (SAED) under different tilting angles.

Orientation relationships between TiB (B27), B2, and Ti3Al phases

2009 ◽  
Vol 24 (5) ◽  
pp. 1688-1692 ◽  
Author(s):  
C.L. Chen ◽  
W. Lu ◽  
L.L. He ◽  
H.Q. Ye
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Diffraction ◽  
Orientation Relationship ◽  
Reciprocal Lattice ◽  
Lattice Points ◽  
Orientation Relationships ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Electron Diffraction Technique

The orientation relationships among TiB (B27), B2, and Ti3Al phases have been investigated by transmission electron microscopy. By using the composite selected-area electron diffraction technique, the orientation relationship between TiB (B27) and B2 was determined to be [100]TiB[001]B2, (001)TiB(010)B2; and that between TiB (B27) and Ti3Al was . These orientation relationships have been predicted precisely by the method of coincidence of reciprocal lattice points.

Twinning and defects in N-Nb2O5

2000 ◽  
Vol 56 (5) ◽  
pp. 780-784 ◽  
Author(s):  
Franziska E. Rohrer ◽  
Ann-Kristin Larsson
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Electron Diffraction ◽  
Stacking Faults ◽  
Twin Plane ◽  
The Other ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Block Arrangement

N-Nb2O5 [C2/m (No. 12), a = 28.51, b = 3.830 and c = 17.48 Å, and β = 124.8°] has been investigated by means of selected-area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). N-Nb2O5 is domain twinned, with the twin plane perpendicular to the c* axis. The domains are rather small and the domain twinning can sometimes be best explained as stacking faults. A second type of coherent twinning at an angle of 90° to the other two domain directions was also found. These domains are linked together by areas containing blocks of different sizes, similar to the disordered block arrangement observed in M-Nb2O5.

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