Oriented Pore Structure Research Articles

Microstructural and mechanical characterization of chitosan scaffolds reinforced by calcium phosphates

Chitosan scaffolds reinforced by β-tricalcium phosphate (β-TCP) and calcium phosphate invert glass were constructed and their microstructures and mechanical performance were studied. The composite scaffolds were macroporous and maintained the regularly oriented pore structure even when β-TCP/chitosan weight ratio was equal to one. Both compressive modulus and yield strength of the scaffolds were greatly improved and reinforced microstructure was achieved. The salient difference in microstructures of chitosan scaffolds with and without glasses suggested that, not only physical incorporation occurred, but also the chemical complexation between chitosan and the fillers might be involved.

Powder materials with oriented pore structures: L.Tuchinsky, R.Loutfy. (MER Corp, USA.)

Powder materials with oriented pore structures: L.Tuchinsky, R.Loutfy. (MER Corp, USA.)

The development of porous microstructures during the dehydration of boehmite

SummaryElectron-microscope observations have been used to follow the low-temperature dehydration of boehmite, and show that a coherent skeleton of γ-Al2O3 with a porous texture is produced. For material fired in air the development of a number of pore systems is described. Of these the most important, as far as the dehydration process is concerned, is a lamellar pore system parallel to (001)γ and having a regular spacing of the order of 35–40. Å. A much faster dehydration process is induced by exposure to the electron beam and results in the formation of a more randomly oriented pore structure. The observed microstructure and the calculated internal surface area are compared with the results of previous adsorption studies.