Preparation of P(GMA-co-EGDMA) Monolithic Columns with Adjustable Porous Properties

2014 ◽  
Vol 936 ◽  
pp. 942-949 ◽  
Author(s):  
Hao Tian Zhang ◽  
Qiu Yu Zhang ◽  
Bao Liang Zhang ◽  
Chun Mei Li
Keyword(s):  
Pore Size ◽  
Monolithic Column ◽  
Organic Polymer ◽  
Monolithic Columns ◽  
Size Distributions ◽  
Notable Effect ◽  
Pore Size Distributions ◽  
Porous Properties ◽  
Glass Tubes ◽  
First Time

Porous properties have notable effect on separating effect of organic polymer-based monolithic column. Different applications of monolithic columns require tailored pore size distributions. On account of that, P(GMA-co-EGDMA) monolithic columns were prepared with novel ternary porogenic agents. Glass tubes was chosen as polymerization mold. Moreover, factors influencing the inner pore morphology, pore size and specific surface area were investigated systematically. The results showed that the increasing of the solubility of porogenic agents and the amount of crosslinker, the decreasing of the amount of porogenic agents and temperature rising all could give rise to the decreasing of pore size. Remarkably, the effect of initiator was studied for the first time. The results showed that amount of initiator had no remarkable influence on porous properties. By controlling effect factors, P(GMA-co-EGDMA) Monolithic Columns with pore size from dozens to thousands of nanometer, which can be applied in separation of molecules with different size.

Sintering polydispersed spherical glass particles

2003 ◽  
Vol 18 (6) ◽  
pp. 1347-1354 ◽  
Author(s):  
Miguel O. Prado ◽  
Edgar D. Zanotto ◽  
Catia Fredericci
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Cross Sections ◽  
Soda Lime ◽  
Size Distributions ◽  
Glass Spheres ◽  
Pore Size Distributions ◽  
Soda Lime Silica Glass ◽  
First Time

We used the Clusters model to study the densification kinetics and resulting porosity of a compact of polydispersed soda-;lime-;silica glass spheres. In addition to the physical data (viscosity, surface tension, particle size distribution) required by the Clusters model, for the first time in glass-;sintering studies, we took extra variables into account: the average number of necks per sphere, the effects of pre-;existing crystals on the particle surfaces, and sample size. The model predicted both the densification kinetics and the resulting pore-;size distribution of sintered compacts. A cross section of a porous sample displayed a porosity pattern that agreed with computer-;simulated cross sections, whose pore-;size distributions was calculated via the Clusters model using a Monte Carlo technique. Its capacity to predict both density and pore-;size distribution makes the Clusters model a valuable tool for designing sintered glasses with any desired microstructure.

scholarly journals Pushing the Limits of NMR Cryoporometry in Polymers from Nanometer to Micron

2020 ◽  
Author(s):  
J. Beau W. Webber ◽  
Alexandre Welle ◽  
vincent livadaris ◽  
Andrey Andreev
Keyword(s):  
Pore Size ◽  
Silicon Oxide ◽  
Size Distributions ◽  
Distribution Study ◽  
Pore Size Distributions ◽  
Wide Range ◽  
Nmr Cryoporometry ◽  
Porosity Analysis ◽  
A Minor ◽  
First Time

We report for the first time the nuclear magnetic resonance cryoporometry (NMRC) pore size distribution study of polypropylene homopolymer fluffs in a wide range from several nanometers up to almost one micrometer. The method, being applicable to fragile materials, provides an opportunity to employ a set of different probe molecules, such as dodecane and hexadecane in this study, to characterize the pore sizes and swelling effect of the polymers. The fluffs have been proven to be essentially macroporous with a minor mesopore part and negligible pore volume of micropores. The residual silica porosity analysis performed to understand the origin of polymer macroporosity emphasize the porosity hidden by the main mesoporosity peak of silicon oxide. This residual macroporosity would seem similar to the macroporosity of the PPH fluffs in terms of PSD. NMRC has been shown to provide robust interconsistent and reproducible pore size distributions of polymers and silicas within the range from several nanometer up to 2 micrometers.

scholarly journals Pushing the Limits of NMR Cryoporometry in Polymers from Nanometer to Micron

2020 ◽  
Author(s):  
J. Beau W. Webber ◽  
Alexandre Welle ◽  
vincent livadaris ◽  
Andrey Andreev
Keyword(s):  
Pore Size ◽  
Silicon Oxide ◽  
Size Distributions ◽  
Distribution Study ◽  
Pore Size Distributions ◽  
Wide Range ◽  
Nmr Cryoporometry ◽  
Porosity Analysis ◽  
A Minor ◽  
First Time

We report for the first time the nuclear magnetic resonance cryoporometry (NMRC) pore size distribution study of polypropylene homopolymer fluffs in a wide range from several nanometers up to almost one micrometer. The method, being applicable to fragile materials, provides an opportunity to employ a set of different probe molecules, such as dodecane and hexadecane in this study, to characterize the pore sizes and swelling effect of the polymers. The fluffs have been proven to be essentially macroporous with a minor mesopore part and negligible pore volume of micropores. The residual silica porosity analysis performed to understand the origin of polymer macroporosity emphasize the porosity hidden by the main mesoporosity peak of silicon oxide. This residual macroporosity would seem similar to the macroporosity of the PPH fluffs in terms of PSD. NMRC has been shown to provide robust interconsistent and reproducible pore size distributions of polymers and silicas within the range from several nanometer up to 2 micrometers.

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

Coal pore size distributions controlled by the coalification process: An experimental study of coals from the Junggar, Ordos and Qinshui basins in China

Fuel ◽  
2017 ◽  
Vol 206 ◽  
pp. 352-363 ◽  
Author(s):  
Yong Li ◽  
Cheng Zhang ◽  
Dazhen Tang ◽  
Quan Gan ◽  
Xinlei Niu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pore Size ◽  
Size Distributions ◽  
Pore Size Distributions

A New X-Ray Scattering Method for Determining Pore-Size Distribution in Low-k Thin Films

2001 ◽  
Vol 714 ◽  
Author(s):  
Kazuhiko Omote ◽  
Shigeru Kawamura
Keyword(s):  
Thin Films ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Gas Adsorption ◽  
Size Distributions ◽  
X Ray ◽  
X Ray Scattering ◽  
Pore Size Distributions ◽  
Scattering Technique ◽  
Ray Scattering

ABSTRACTWe have successively developed a new x-ray scattering technique for a non-destructive determination of pore-size distributions in porous low-κ thin films formed on thick substrates. The pore size distribution in a film is derived from x-ray diffuse scattering data, which are measured using offset θ/2θ scans to avoid strong specular reflections from the film surface and its substrate. Γ-distribution mode for the pores in the film is used in the calculation. The average diameter and the dispersion parameter of the Γ-distribution function are varied and refined by computer so that the calculated scattering pattern best matches to the experimental pattern. The technique has been used to analyze porous methyl silsesquioxane (MSQ) films. The pore size distributions determined by the x-ray scattering technique agree with that of the commonly used gas adsorption technique. The x-ray technique has been also used successfully determine small pores less than one nanometer in diameter, which is well below the lowest limit of the gas adsorption technique.

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