scholarly journals Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

2020 ◽  
Vol 22 (7) ◽  
pp. 1901432 ◽  
Author(s):  
Daniel D. Athayde ◽  
Bruno M. Sousa ◽  
Ana Clara A. Dolabella ◽  
Jéssica de O. N. Ribeiro ◽  
Daniela C. L. Vasconcelos ◽  
...  
Keyword(s):  
Pore Structure ◽  
Freeze Casting ◽  
Highly Porous ◽  
Tubular Alumina

scholarly journals Yttrium Oxide Freeze-Casts: Target Materials for Radioactive Ion Beams

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2864
Author(s):  
Eva Kröll ◽  
Miriana Vadalà ◽  
Juliana Schell ◽  
Simon Stegemann ◽  
Jochen Ballof ◽  
...  
Keyword(s):  
Pore Structure ◽  
Yttrium Oxide ◽  
Ion Beam ◽  
Isotope Separation ◽  
Target Material ◽  
Ion Beams ◽  
Radioactive Isotopes ◽  
Solid Loading ◽  
Radioactive Ion Beams ◽  
Freeze Casting

Highly porous yttrium oxide is fabricated as ion beam target material in order to produce radioactive ion beams via the Isotope Separation On Line (ISOL) method. Freeze casting allows the formation of an aligned pore structure in these target materials to improve the isotope release. Aqueous suspensions containing a solid loading of 10, 15, and 20 vol% were solidified with a unidirectional freeze-casting setup. The pore size and pore structure of the yttrium oxide freeze-casts are highly affected by the amount of solid loading. The porosity ranges from 72 to 84% and the crosslinking between the aligned channels increases with increasing solid loading. Thermal aging of the final target materials shows that an operation temperature of 1400 °C for 96 h has no significant effect on the microstructure. Thermo-mechanical calculation results, based on a FLUKA simulation, are compared to measured compressive strength and forecast the mechanical integrity of the target materials during operation. Even though they were developed for the particular purpose of the production of short-lived radioactive isotopes, the yttria freeze-cast scaffolds can serve multiple other purposes, such as catalyst support frameworks or high-temperature fume filters.

Fabrication of poly (1, 8-octanediol-co-Pluronic F127 citrate)/chitin nanofibril/bioactive glass (POFC/ChiNF/BG) porous scaffold via directional-freeze-casting

2020 ◽  
Vol 40 (7) ◽  
pp. 591-599
Author(s):  
Yaling Tian ◽  
Kai Liang ◽  
Yali Ji
Keyword(s):  
Bioactive Glass ◽  
Porous Structure ◽  
Pore Structure ◽  
Porous Scaffold ◽  
Pluronic F127 ◽  
Porous Scaffolds ◽  
Freeze Casting ◽  
Promising Candidate ◽  
Complete Replacement

AbstractThe citrate-based thermoset elastomer is a promising candidate for bone scaffold material, but the harsh curing condition made it difficult to fabricate porous structure. Recently, poly (1, 8-octanediol-co-Pluronic F127 citrate) (POFC) porous scaffold was creatively fabricated by chitin nanofibrils (ChiNFs) supported emulsion-freeze-casting. Thanks to the supporting role of ChiNFs, the lamellar pore structure formed by directional freeze-drying was maintained during the subsequent thermocuring. Herein, bioactive glass (BG) was introduced into the POFC porous scaffolds to improve bioactivity. It was found the complete replacement of ChiNF particles with BG particles could not form a stable porous structure; however, existing at least 15 wt% ChiNF could ensure the formation of lamellar pore, and the interlamellar distance increased with BG ratios. Thus, the BG granules did not contribute to the formation of pore structure like ChiNFs, however, they surely endowed the scaffolds with enhanced mechanical properties, improved osteogenesis bioactivity, better cytocompatibility as well as quick degradation rate. Reasonably adjusting BG ratios could balance the requirements of porous structure and bioactivity.

Unusual pore structure and sorption behaviour in a hexanodal zinc–organic framework material

2014 ◽  
Vol 50 (14) ◽  
pp. 1678-1681 ◽  
Author(s):  
Jinjie Qian ◽  
Feilong Jiang ◽  
Linjie Zhang ◽  
Kongzhao Su ◽  
Jie Pan ◽  
...  
Keyword(s):  
Pore Structure ◽  
Metal Organic Framework ◽  
Porous Metal ◽  
Sorption Behaviour ◽  
Metal Organic ◽  
Highly Porous ◽  
Organic Framework

A highly porous metal–organic framework structurally consists of three topological kinds of 3-connected 1,3,5-benzenetricarboxylate ligands, Zn2(COO)4, Zn3O(COO)6 and Zn4O(COO)6 SBUs, featuring a new 3,3,3,4,4,6-c hexanodal topology.

Highly Porous Carbon Derived from Sunflower Seed Shell for Electrochemical Capacitor

2011 ◽  
Vol 287-290 ◽  
pp. 1420-1423 ◽  
Author(s):  
Wei Xing ◽  
Xiao Li ◽  
Xiu Li Gao ◽  
Shu Ping Zhuo
Keyword(s):  
Pore Structure ◽  
Electrode Material ◽  
Sunflower Seed ◽  
High Performance ◽  
Chemical Activation ◽  
Electrochemical Capacitor ◽  
Drain Current ◽  
Porous Carbons ◽  
Activation Temperature ◽  
Highly Porous

Highly porous carbons were prepared from sunflower seed shell (SSS) by chemical activation and used as electrode material for electrochemical double layer capacitor (EDLC). The surface area and pore structure of the porous carbons are characterized intensively using N2 adsorption technique. The results show that the pore-structure of the carbons is closely related to activation temperature. Electrochemical measurements show that the carbons have excellent capacitive behavior and high capacitance retention ratio at high drain current, which is due to that there are both abundant macroscopic pores and micropore surface in the texture of the carbons. More importantly, the capacitive performances of these carbons are much better than ordered mesoporous carbons, thus highlighting the success of preparing high performance electrode material for EDLC from SSS.

Vanadium nitride@N-doped carbon nanocomposites: tuning of pore structure and particle size through salt templating and its influence on supercapacitance in ionic liquid media

RSC Advances ◽  
2014 ◽  
Vol 4 (51) ◽  
pp. 26981-26989 ◽  
Author(s):  
Nina Fechler ◽  
Girum Ayalneh Tiruye ◽  
Rebeca Marcilla ◽  
Markus Antonietti
Keyword(s):  
Particle Size ◽  
Ionic Liquid ◽  
Pore Structure ◽  
Pore Volume ◽  
Porous Metal ◽  
Vanadium Nitride ◽  
Carbon Composites ◽  
Liquid Media ◽  
Carbon Nanocomposites ◽  
Highly Porous

Using salts as porogens, highly porous metal nitride@N-doped carbon composites with tunable surface area, pore size, pore volume and particle size are synthesized and systematically tested as supercapacitor electrodes.

Fabrication of Highly Porous Chromium Carbide with Multiple Pore Structure

2013 ◽  
Vol 97 (4) ◽  
pp. 1317-1325 ◽  
Author(s):  
Ziqiang Dong ◽  
Qinya Zhang ◽  
Weixing Chen
Keyword(s):  
Pore Structure ◽  
Chromium Carbide ◽  
Highly Porous

scholarly journals The influence of Fe2O3 doping on the pore structure and mechanical strength of TiO2-containing alumina obtained by freeze-casting

2015 ◽  
Vol 41 (10) ◽  
pp. 14049-14056 ◽  
Author(s):  
Alysson M.A. Silva ◽  
Eduardo H.M. Nunes ◽  
Douglas F. Souza ◽  
Dana L. Martens ◽  
João C. Diniz da Costa ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Pore Structure ◽  
Freeze Casting

Reverse freeze casting: A new method for fabricating highly porous titanium scaffolds with aligned large pores

2012 ◽  
Vol 8 (6) ◽  
pp. 2401-2410 ◽  
Author(s):  
Se-Won Yook ◽  
Hyun-Do Jung ◽  
Chang-Hoon Park ◽  
Kwan-Ha Shin ◽  
Young-Hag Koh ◽  
...  
Keyword(s):  
Porous Titanium ◽  
New Method ◽  
Freeze Casting ◽  
Highly Porous
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