Convection in ternary porous layers with depth-dependent permeability and viscosity

2016 ◽  
pp. 289-303
Author(s):  
Salvatore Rionero
Keyword(s):  
Porous Layers

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

Free and mixed convection in horizontal porous layers with multiple heat sources

10.2514/3.167 ◽  
1990 ◽  
Vol 4 (2) ◽  
pp. 221-227 ◽  
Author(s):  
F. C. Lai ◽  
C. Y. Choi ◽  
F. A. Kulacki
Keyword(s):  
Mixed Convection ◽  
Heat Sources ◽  
Porous Layers

Analysis of Water Transport in the Vicinity of Micro-Porous Layer in PEFC With Freezing Method

2013 ◽  
Author(s):  
Yusuke Aoyama ◽  
Kengo Suzuki ◽  
Yutaka Tabe ◽  
Takemi Chikahisa
Keyword(s):  
Catalyst Layer ◽  
Cathode Side ◽  
Cross Sectional ◽  
Porous Layers ◽  
Freezing Method ◽  
Water Condensation ◽  
Flow Channels ◽  
Condensed Water ◽  
Electronic Microscope

This paper examines the role of micro porous layers (MPLs) in Polymer Electrode Fuel Cells (PEFCs) by observing the cross-sectional distribution of condensed water inside a cathode side MPL In addition, the forms of water condensation in the vicinity of a MPL are also compared between two places, under flow channels and under lands, by observing both inside the MPL and an interface between the MPL and a catalyst layer (CL). The freezing method and a cryo-scanning electronic microscope (cryo-SEM) are used for the observation. The result under the non-flooded condition shows that condensed water does not accumulate inside the MPL. This result indicates that the water produced by PEFC power generation passes through the MPL as vapor state under non-flooded conditions.

scholarly journals Porous Silicon Biosensor for the Detection of Bacteria through Their Lysate

Biosensors ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 27
Author(s):  
Roselien Vercauteren ◽  
Audrey Leprince ◽  
Jacques Mahillon ◽  
Laurent A. Francis
Keyword(s):  
Porous Silicon ◽  
Electrochemical Etching ◽  
Bacterial Lysate ◽  
Fast Detection ◽  
Porous Layers ◽  
Deep Blue ◽  
Diffusion Limited ◽  
Colony Forming Units ◽  
Selective Lysis ◽  
Microfabrication Techniques

Porous silicon (PSi) has been widely used as a biosensor in recent years due to its large surface area and its optical properties. Most PSi biosensors consist in close-ended porous layers, and, because of the diffusion-limited infiltration of the analyte, they lack sensitivity and speed of response. In order to overcome these shortcomings, PSi membranes (PSiMs) have been fabricated using electrochemical etching and standard microfabrication techniques. In this work, PSiMs have been used for the optical detection of Bacillus cereus lysate. Before detection, the bacteria are selectively lysed by PlyB221, an endolysin encoded by the bacteriophage Deep-Blue targeting B. cereus. The detection relies on the infiltration of bacterial lysate inside the membrane, which induces a shift of the effective optical thickness. The biosensor was able to detect a B. cereus bacterial lysate, with an initial bacteria concentration of 105 colony forming units per mL (CFU/mL), in only 1 h. This proof-of-concept also illustrates the specificity of the lysis before detection. Not only does this detection platform enable the fast detection of bacteria, but the same technique can be extended to other bacteria using selective lysis, as demonstrated by the detection of Staphylococcus epidermidis, selectively lysed by lysostaphin.

Simulation of gas diffusion in porous layers of varying structure

2009 ◽  
Vol 50 (3) ◽  
pp. 403-410 ◽  
Author(s):  
A. V. Anikeenko ◽  
N. N. Medvedev ◽  
M. K. Kovalev ◽  
M. S. Melgunov
Keyword(s):  
Gas Diffusion ◽  
Porous Layers
Sign in / Sign up

Export Citation Format

Share Document