Relaxation of a fluid-filled blister on a porous substrate

In the production of astaxanthin from Haematococcus pluvialis, the process of growing algal biomass in the vegetative green stage is an indispensable step in both suspended and immobilized cultivations. The green algal biomass is usually cultured in a suspension under a low light intensity. However, for astaxanthin accumulation, the microalgae need to be centrifuged and transferred to a new medium or culture system, a significant difficulty when upscaling astaxanthin production. In this research, a small-scale angled twin-layer porous substrate photobioreactor (TL-PSBR) was used to cultivate green stage biomass of H. pluvialis. Under low light intensities of 20–80 µmol photons m−2·s−1, algae in the biofilm consisted exclusively of non-motile vegetative cells (green palmella cells) after ten days of culturing. The optimal initial biomass density was 6.5 g·m−2, and the dry biomass productivity at a light intensity of 80 µmol photons m−2·s−1 was 6.5 g·m−2·d−1. The green stage biomass of H. pluvialis created in this small-scale angled TL-PSBR can be easily harvested and directly used as the source of material for the inoculation of a pilot-scale TL-PSBR for the production of astaxanthin.

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Rapid Thermal Oxidation for Passivation of Porous Silicon

MRS Proceedings ◽

10.1557/proc-342-91 ◽

1994 ◽

Vol 342 ◽

Cited By ~ 6

Author(s):

I. BÁrsony ◽

J.G.E. Klappe ◽

É. Vázsonyi ◽

T. Lohner ◽

M. Fried

Keyword(s):

Porous Silicon ◽

Mechanical Stability ◽

Porous Substrate ◽

X Ray Diffraction ◽

X Ray ◽

Si Substrates ◽

Tetragonal Lattice ◽

Optical Heating ◽

Vertical Inhomogeneity ◽

Highly Porous

ABSTRACTChemical and mechanical stability of porous silicon layers (PSL) is the prerequisite of any active (luminescent) or passive (e.g. porous substrate) integrated applications. In this work X-ray diffraction (XRD) was used to analyze quantitatively the strain distribution obtained in different morphology PSL that were prepared on (100) p and p+Si substrates. Tetragonal lattice constant distortion can be as high as 1.4% in highly porous “as-prepared” samples. Incoherent optical heating RTO is governed by the absorption in the oxidized specimen. PSL show vertical inhomogeneity according to interpretation of spectroscopic ellipsometry (SE) data. Oxygen incorporation during RTO is controlled by specific surface (in p+ proportional, in p inversely proportional with porosity), while the developing compressive stress depends on pore size, and decreases with porosity in both morphologies.

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Closure to “Discussion of ‘Analysis of Heat Transfer Regulation and Modification Employing Intermittently Emplaced Porous Cavities’ and ‘Analysis of Flow and Heat Transfer Over an External Boundary Covered With a Porous Substrate’” (1995, ASME J. Heat Transfer, 117, p. 554)

Journal of Heat Transfer ◽

10.1115/1.2822568 ◽

1995 ◽

Vol 117 (2) ◽

pp. 554-555 ◽

Cited By ~ 2

Author(s):

K. Vafai ◽

S. J. Kim

Keyword(s):

Heat Transfer ◽

External Boundary ◽

Porous Substrate ◽

Flow And Heat Transfer

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Influence of Substrate Temperature in the Morphology and Microstructure of YSZ Films Obtained on LSM Porous Substrate via Spray Pyrolysis

Materials Science Forum ◽

10.4028/www.scientific.net/msf.727-728.691 ◽

2012 ◽

Vol 727-728 ◽

pp. 691-696 ◽

Cited By ~ 1

Author(s):

Tiago Falcade ◽

Giselle Barbosa de Oliveira ◽

Diego Pereira Tarragó ◽

Vânia Caldas de Sousa ◽

Célia de Fraga Malfatti

Keyword(s):

Substrate Temperature ◽

Spray Pyrolysis ◽

Spray Pyrolysis Technique ◽

Precursor Solution ◽

Cubic Phase ◽

Porous Substrate ◽

X Ray Diffraction ◽

Heat Treated ◽

Ft Ir ◽

Influence Of Substrate

Many studies have been reported in the literature related to YSZ films deposited on dense substrate or applied directly on the SOFC anode. However, there are not a lot of studies about the YSZ deposition on the cathode. The present work aims to obtain yttria-stabilized zirconia (YSZ), using the spray pyrolysis technique, for their application as electrolyte in solid oxide fuel cells (SOFC). The films were obtained from a precursor solution containing zirconium and yttrium salts, dissolved in ethanol and propylene glycol (1:1), this solution was sprayed onto a heated LSM porous substrate. The substrate temperature was varied in order to obtain dense and homogeneous films. After deposition, the films were heat treated, aiming to crystallize and stabilize the zirconia cubic phase. The films were characterized by Scanning Electron Microscopy (SEM), thermal analysis, X-ray diffraction and Fourier transform Infrared Spectroscopy (FT-IR).

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