scholarly journals Characterization of Mesoporous Zirconium and Cerium Oxides by Transmission Electron Microscopy

2012 ◽  
Vol 18 (S5) ◽  
pp. 81-82 ◽  
Author(s):  
M.A. Salvador ◽  
J. Canales-Vázquez ◽  
P. Ferreira ◽  
F.M. Figueiredo
Keyword(s):  
Mesoporous Materials ◽  
High Specific Surface Area ◽  
Size Distributions ◽  
Average Pore ◽  
Cerium Oxides ◽  
Transmission Electron ◽  
Pore Size Distributions ◽  
Soft Templating ◽  
Large Pore Volume

Mesoporous materials have typical average pore diameters in the range 20 – 500 Å, which are usually accompanied by high specific surface area (ABET) and large pore volume (Vp) with narrow pore size distributions. These features are very attractive for potential application as catalysts and adsorbents. Mesoporous materials are usually prepared by soft templating or nanocasting process. The latter approach is based on the replication of hard-templates, such as mesoporous silica (e.g. SBA-15), being a very flexible and suitable method to obtain stable and predictable pore mesostructures. However, the chemical compatibility between the template and the precursors must be ensured.

Fabrication and Characterization of Diatomite Functionalized Cellulose Acetate Nanofibers

2019 ◽  
Vol 6 (3) ◽  
pp. 28-36
Author(s):  
Çiğdem Akduman
Keyword(s):  
Pore Size ◽  
Cellulose Acetate ◽  
High Specific Surface Area ◽  
High Porosity ◽  
Size Distributions ◽  
Mean Flow ◽  
Water Contact ◽  
Pore Size Distributions ◽  
Nanofiber Membranes

Cellulose acetate (CA) nanofiber membranes incorporated with diatomite (DE) were prepared by electrospinning to produce electrospun nanofiber membranes with high specific surface area and high porosity with fine pores. When the DE percentage increased from 0 to 30%, the water contact angle (WCA) of the membranes increased from 86.21° to 118.44°, indicating that neat CA nanofibers were more hydrophilic than CA/DE nanofibers and had a better wetting tendency. CA, CA-10DE, and CA-20DE nanofiber membranes showed a mean flow pore size (MFP) of 2.941, 2.681, and 2.408 μm, respectively, with narrow pore size distributions. However, the CA-30DE nanofiber membrane showed a smaller MFP size of 0.5014 μm. CA nanofibers were produced in the range of 206.31 to 281.13 nm. The dye removal ability of these membranes was tested using an aqueous solution of C.I. Reactive Red 141.

CHARACTERIZATION OF PORE SIZE DISTRIBUTIONS USING NON-NEWTONIAN FLUIDS

2020 ◽  
Author(s):  
Scott C. Hauswirth ◽  
◽  
Majdi Abou Najm ◽  
Christelle Basset
Keyword(s):  
Pore Size ◽  
Newtonian Fluids ◽  
Size Distributions ◽  
Pore Size Distributions

Characterization of Chiral Mesoporous Materials by Transmission Electron Microscopy

Small ◽  
2005 ◽  
Vol 1 (2) ◽  
pp. 233-237 ◽  
Author(s):  
Tetsu Ohsuna ◽  
Zheng Liu ◽  
Shunai Che ◽  
Osamu Terasaki
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Mesoporous Materials ◽  
Transmission Electron

scholarly journals Multifractal Characterization of Pore Size Distributions of Peat Soil

2016 ◽  
Vol 48 (2) ◽  
pp. 106-114 ◽  
Author(s):  
Joko Sampurno ◽  
◽  
Azrul Azwar ◽  
Fourier Dzar Eljabbar Latief ◽  
Wahyu Srigutomo ◽  
...  
Keyword(s):  
Pore Size ◽  
Peat Soil ◽  
Size Distributions ◽  
Pore Size Distributions

scholarly journals Multifractal Characterization of Pore Size Distributions of Peat Soil

2016 ◽  
Vol 48 (2) ◽  
pp. 106-114
Author(s):  
Joko Sampurno ◽  
◽  
Azrul Azwar ◽  
Fourier Dzar Eljabbar Latief ◽  
Wahyu Srigutomo ◽  
...  
Keyword(s):  
Pore Size ◽  
Peat Soil ◽  
Size Distributions ◽  
Pore Size Distributions

Determination of Pore Size Distributions in Nano-Porous Thin Films from Small Angle Scattering

2003 ◽  
Vol 766 ◽  
Author(s):  
Barry J. Bauer ◽  
Ronald C. Hedden ◽  
Hae-Jeong Lee ◽  
Christopher L. Soles ◽  
Da-Wei Liu
Keyword(s):  
Pore Size ◽  
Small Angle ◽  
Length Distribution ◽  
Dielectric Constants ◽  
Scattering Data ◽  
Size Distributions ◽  
Average Pore ◽  
Pore Size Distributions ◽  
Phase Size

AbstractSmall angle neutron and x-ray scattering (SANS, SAXS) are powerful tools in determination of the pore size and content of nano-porous materials with low dielectric constants (low-k) that are being developed as interlevel dielectrics. Several models have been previously applied to fit the scattering data in order to extract information on the average pore and/or matrix size. A new method has been developed to provide information on the size distributions of the pore and matrix phases based on the “chord length distribution” introduced by Tchoubar and Mering. Examples are given of scattering from samples that have size distributions that are narrower and broader than the random distribution typical of scattering described by Debye, Anderson, and Brumberger. An example of fitting SANS data to a phase size distribution is given.

Characterization of Well-Dispersed CeO2 Nanoparticles Prepared by a New Method of Reverse Microemulsion

2011 ◽  
Vol 194-196 ◽  
pp. 781-784
Author(s):  
Fa Mei Feng ◽  
Jia Qing Xie ◽  
Li Ke Zou ◽  
Bin Xie
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Ceo2 Nanoparticles ◽  
Size Distributions ◽  
X Ray ◽  
Transmission Electron ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Cubic Structure

Well-dispersed CeO2 nanoparticles were successfully prepared in a simple system composed of sodium bis (2-ethylhexyl) sulfosuccinate (AOT)- octane-water (W/O) microemulsion in this paper. The morphology and microstructure of the products were characterized by the laser particle size analyzer, Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), differential scanning calorimeter (DSC) and transmission electron microscope (TEM). It was found that the CeO2nanoparticles obtained from this method have well-proportioned size distributions; the surfactant (AOT) molecule was adsorbed on the surface of CeO2nanoparticles precursor, which is favorable for the dispersion of CeO2nanoparticles; the CeO2nanoparticles calcined was a crystal of the cubic structure. In addition, the mechanism on the formation of the CeO2nanoparticles was also proposed in this paper.

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