Morphological analysis of differently sized highly porous poly(ether imide) microparticles by mercury porosimetry

2016 ◽  
Vol 28 (10) ◽  
pp. 1269-1277 ◽  
Author(s):  
Matthias Heuchel ◽  
David Gerber ◽  
Karl Kratz ◽  
Andreas Lendlein
Keyword(s):  
Morphological Analysis ◽  
Mercury Porosimetry ◽  
Highly Porous ◽  
Porous Poly

Effect of Sorbent Physical Structure—Pore Size Distribution and Surface Morphology—on the Limestone Capability for Sulfation

2008 ◽  
Author(s):  
Paula M. Crnkovic ◽  
Ivonete A´vila ◽  
Fernando E. Milioli ◽  
Josmar D. Pagliuso
Keyword(s):  
Morphological Analysis ◽  
Mercury Porosimetry ◽  
Strong Dependence ◽  
Sulfur Removal ◽  
Physical Structure ◽  
Efficient Technology ◽  
Pore Filling ◽  
Air Atmosphere ◽  
Bet Analysis ◽  
Low Efficiency

Sulfur oxides are present in the gases from burning coals and these pollutants are harmful to the environment. Sulfur removal in the fluidized bed reactor applying limestones is an efficient technology. During sulfation, the formation of CaSO4 leads to the partial or complete blockade of the particle interior, resulting in a low efficiency of the use of limestones. As the desulphurization capacities of the sorbents are strongly affected by thermal condition, this paper focuses on the study of the development of the particles’ physical structure before and during sulfation reaction. The experiments were performed for two Brazilian limestones, a calcite and a dolomite. The particles were well characterized by BET analysis and mercury porosimetry and the behavior of the sorbents was observed through thermogravimetry analysis (TGA). The morphological analysis of the surface of both raw calcite and dolomite particles indicated that dolomite was a less compact sorbent. However, after calcination and sulfation, the change in pore and voids distributions showed that for dolomite both swelling and partial pore filling could take place, whereas for calcite the spaces between particles were maintained constant, possibly owing to a less intense swelling. In 30 min of reaction under air atmosphere TGA measurements provided conversions of 0.40 ±0.061 for the calcite, and 0.55 ±0.089 for the dolomite. The results showed strong dependence on meso and macropores region with high conversion of the sorbents. The reactivity differences between calcite and dolomite can also be explained based on the swelling of the particles.

Fabrication of highly porous poly (ε-caprolactone) microfibers via electrospinning

2011 ◽  
Vol 19 (2) ◽  
pp. 217-223 ◽  
Author(s):  
Yun-A Seo ◽  
Hem Raj Pant ◽  
R. Nirmala ◽  
Ji-Hui Lee ◽  
Kyung Geun Song ◽  
...  
Keyword(s):  
Highly Porous ◽  
Porous Poly

Biodegradable Cell Transplantation Devices for Tissue Regeneration

1991 ◽  
Vol 252 ◽  
Author(s):  
Antonios G. Mikos ◽  
Heidi L. Wald ◽  
Georgios Sarakinos ◽  
Susan M. Leite ◽  
Robert Langer
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Transplantation ◽  
Tissue Regeneration ◽  
Cell Function ◽  
Mercury Porosimetry ◽  
Three Dimensional ◽  
Visual Evaluation ◽  
Highly Porous ◽  
Scanning Electron

ABSTRACTBiodegradable polymers can be utilized as templates for cell transplantation and regeneration of metabolic organs and structural tissues. Candidate materials must be adhesive substrates for cells, promote cell growth and allow for retention of cell function. However, the processing requirements of such materials into highly porous three-dimensional structures with large surface per volume and an interconnecting pore network limits their potential application for tissue regeneration. A new processing technique was developed to produce uniform, three-dimensional cell transplantation devices of poly(lactic-co-glycolic acid). The process involved the preparation of highly porous membranes by a solvent-casting and particulate-leaching technique followed by their lamination. The device structural and mechanical properties depended on those of their constituent membranes, as evaluated by mercury porosimetry, scanning electron microscopy, and thermomechanical analysis. Cells to be seeded into the devices were injected from catheters incorporated within their structure. In vitro studies with model suspensions of dyed microspheres allowed for visual evaluation of the internal pore structure of various layered devices. From these studies, numerous parameters of device design for cell seeding were determined including pore size and injection rate. The membrane lamination technique produced devices without interfaces between layers as determined by microsphere injection and scanning electron microscopy.

Study of highly porous poly‐ l ‐lactide‐based composites with chitosan and collagen

2020 ◽  
Author(s):  
Christina G. Antipova ◽  
Ksenia I. Lukanina ◽  
Sergey V. Krasheninnikov ◽  
Sergey N. Malakhov ◽  
Roman A. Kamyshinsky ◽  
...  
Keyword(s):  
Highly Porous ◽  
Porous Poly

scholarly journals Electrospun highly porous poly(L-lactic acid)-dopamine-SiO2 fibrous membrane for bone regeneration

2020 ◽  
Vol 117 ◽  
pp. 111359 ◽  
Author(s):  
Zihan Lu ◽  
Weiguang Wang ◽  
Jing Zhang ◽  
Paulo Bártolo ◽  
Hugh Gong ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Bone Regeneration ◽  
Fibrous Membrane ◽  
Highly Porous ◽  
Porous Poly

Controlling pore sizes in highly porous Poly(Styrene-Divinylbenzene) sponges for preferable oil sorption

2019 ◽  
Vol 77 ◽  
pp. 105931 ◽  
Author(s):  
Marina Y. Koroleva ◽  
Sergey A. Shirokikh ◽  
Pavel S. Zagoskin ◽  
Evgeny V. Yurtov
Keyword(s):  
Pore Sizes ◽  
Oil Sorption ◽  
Styrene Divinylbenzene ◽  
Highly Porous ◽  
Porous Poly
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