Abstract Here, we report on core–clad bioactive borosilicate fibers, that we have prepared both with round and rectangular cross‐section profile. The exposed approach, which relies on the stacking and drawing of glass slabs, demonstrates our ability to develop bioactive‐based glass fibers with tailored cross‐section profiles. Tens‐of‐meters‐long fibers were successfully drawn, although suffering from elevated losses in the case of the rectangular ones. The response of the fibers in simulated body fluid was studied for both geometries. We found that a round cladding can act as protective layer, tempering effects of the corrosion. We also noticed that rectangular fibers are more prone to degradation, the enhanced corrosion beginning from their sharp corners as they accumulated residual tensile stress during drawing. To the best of our knowledge, this is the first report on the effect of residual tensile stresses from surface tension deformations applied to the corrosion of rectangular fibers. As geometry plays a critical role on the biodegradation behavior of the fiberglass, we believe the enclosed results could lead to the design of fiber devices with tailored cross‐section profile in order to tune their rate of degradation on solely based geometrical effects.

Cladding (metalworking)

Borosilicate glass

Tension (geology)

10.1111/jace.19304

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Citations (2)

Synchrotron 3D microtomography of halite aggregates during experimental pressure solution creep and evolution of the permeability

Geophysical Research Letters (2004)

François Renard Dominique Bernard Xavier Thibault Élodie Boller

Pressure solution creep is one of the possible processes of mechano‐chemical deformation that controls porosity and permeability variations in the upper crust. The three‐dimensional geometry of the porous network of halite aggregates was imaged during compaction driven by pressure solution creep using X‐ray synchrotron computed microtomography. This technique can be used to monitor individual grain contacts and whole aggregate textural changes during deformation. By reconstructing subvolumes, the 3D porosity of the aggregates was extracted. The time‐resolved decrease in permeability during porosity reduction was calculated by solving the Stokes equations. The permeability remained isotropic and decreased from 2.1 to 0.15 Darcy after 18.2% compaction. Two microscopic mechanisms can explain the permeability reduction: grain indentation and pore connectivity reduction by precipitation on the free surface of pore throats.

Halite

Pressure solution

Poromechanics

10.1029/2004gl019605

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Citations (56)

Using the Volume Averaging Technique to Perform the First Change of Scale for Natural Random Porous Media

Dominique Bernard

Closure (psychology)

Relevance

10.1007/978-3-7091-2696-7_2

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Citations (8)

A Rigid Registration Method for the Study of Microgeometry Evolution of Limestone during Dissolution by Acidic Water

Erwan Plougonven Dominique Bernard

This paper describes the use of image processing techniques applied to register X-Ray computed microtomographies of a porous limestone sample undergoing a reactive flowthrough experiment by carbon-dioxide saturated water. Registration of the different stages allows for accurate measurements of the microgeometry evolution.

Sample (material)

10.1002/9780470612187.ch36

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Citations (1)

Qu’attendre des techniques d’imagerie 3D/4D multi-échelles ?

Dominique Bernard

Source

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