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Impregnation of 3D Woven Carbon Fibre Preforms by Electrophoretic Deposition of Single and Mix of Non Oxide Ceramic Nanoscale Powders, and Densification of the Composite Material (2006)

Eberling-Fux, N. ; Pailler, R. ; Guette, A. ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Advances in science and technology Vol. 50 (Oct. 2006), p. 91-96

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ISSN: 1662-0356

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Natural Sciences in General , Technology

Notes: 3D woven carbon fibre preforms (~ 2 mm thickness) were impregnated with single ormixture of non oxide ceramic nanoscale powders in ethanolic suspensions using electrophoreticdeposition (EPD). The measurement of the ζ potential of the suspension compared with itsbehaviour in sedimentation permits to conclude about the optimal concentration of surfactantnecessary to get the most stable suspension. The experimental results were in agreement with thetheoretical ones obtained using DLVO (Derjaguin, Landau, Verwey and Overbeek) theory. EPDswere carried out by applying a constant voltage between the 3D carbon fibre preform serving asdeposition electrode and counter electrodes in graphite. The effect of the powder concentrationon the rate and the quality of impregnation was studied. A qualitative model based on theexperimental results and literature was then proposed. Experiments were not only carried out onraw 3D fibrous preforms but also on preforms with interphases. SEM and optical micrographiesof fractured and polished sections of the infiltrated fabrics revealed that a quite high degree ofinfiltration (rates of impregnation estimated between 50 and 70 %) was obtained. At last, thecomposite was densified using spark plasma sintering (SPS)

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.50.91.pdf

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Electronic Resource

Carbonic anhydrase activity in primary sensory neurons (1986)

Kazimierczak, Jerzy ; Sommer, Ernst W. ; Philippe, Eric ; [et al.]

Springer

Cell & tissue research 245 (1986), S. 487-495

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ISSN: 1432-0878

Keywords: Carbonic anhydrase ; Cytoenzymatic localization ; Enzyme localization ; Sensory neurons ; Satellite cells ; Dorsal root ganglion ; Chicken ; Mouse

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary Subpopulations of primary sensory neurons in mammalian dorsal root ganglion (DRG) exhibit carbonic anhydrase (CA) activity. To identify these subpopulations in DRG cells of mouse and chicken, the reliability of the cytochemical localization of the enzyme requires that several conditions be fulfilled: (1) Preservation of the enzyme activity in glutaraldehyde-containing fixative; (2) accessibility of the cytoenzymatic reaction throughout 20-μm thick Vibratome sections; (3) retention of the reaction product in situ during OsO4 post-fixation; (4) specificity of the cytoenzymatic reaction for CA activity as corroborated by the immunocytochemical detection with antibodies anti-CA II in mouse DRG; (5) strict correlation between the CA activity and the cytological characteristics in a given subclass of neurons. On the basis of these criteria, it is concluded that the CA activity may be used as a cell marker to identify cytologically defined neuronal subpopulations and their axons in mouse DRG. In chicken DRG, CA activity is not consistently expressed in a given subclass of ganglion cells and their axons. Hence, it is assumed that the expression of CA activity by DRG cells in chicken is modulated by functional or environmental conditions.