Porous electrical properties

Anderson, W. G., 1986b, Wettability Literature Search — Part 3 The Effects of Wettability on the Electrical Properties of Porous Media Journal of Petroleum Technology, December, pp. 1371-1378. 

ENTER Membranes LLC has developed Teklon— a highly porous, ultrahigh molecular weight polyethylene separator for lithium-ion batteries. At the writing of this publication, the separator is available in small quantities. Pekala et al. characterized Celgard, Setela, and Teklon separators in terms of their physical, mechanical, and electrical properties. ... 

We have now demonstrated that both the FDSP and FDE responses are dependent on the capillary/pore dimension. Once the pore dimension is known this can applied to an appropriate permeability model to obtain more information about the porous media. Using an appropriate permeability model along with formation factor measurements we can estimate the permeability of porous samples. Alternatively, if we measure the permeability of a sample we can then use the permeability model to determine the formation factor and tortuosity of the sample using measurements that are base on the hydraulic properties and not the electrical properties. This is currently a work in progress to compare formation factor measurements made using the two methods. 

The metal oxides prepared by conventional baking or by the CVD method are, in general, chemically stable, crystalline materials, and show excellent mechanical, electrical, optical, and physical properties. Flexible porous gel films obtained by the surface sol-gel process are totally different. In this chapter, we described a new preparative method for ultrathin metal oxide films by stepwise adsorption of various metal alkoxides. We named this method the surface sol-gel process. Structural characterization of the gel films thus obtained, the electrical property, and formation of nano-composites with organic compounds, were also explained. The soft porous gel contains many active hydroxyl groups at the surface and interior of the film. This facilitates adsorption of organic compounds, and consequent preparation of ultrathin metal oxide/polymer nano-composite films and organization of functional small molecules. In the nano-composites, proper selection of polymer components leads to the design of new materials with unique electrical, optical, and chemi-... 

Konenkamp R. and Rieck 1. (1999), Electrical properties of Schottky diodes on nano-porous TiOi films . Mat. Sci. Eng. B 69-70, 519-521. 

Porous materials—Electric properties. 2. Electrochemistry. 1. Title. 

Concerning the two-layer model, the thickness and properties of each layer depend on the nature of the electrolyte and the anodisation conditions. For the application, a permanent control of thickness and electrical properties is necessary. In the present chapter, electrochemical impedance spectroscopy (EIS) was used to study the film properties. The EIS measurements can provide accurate information on the dielectric properties and the thickness of the barrier layer [13-14]. The porous layer cannot be studied by impedance measurements because of the high conductivity of the electrolyte in the pores [15]. The total thickness of the aluminium oxide films was determined by scanning electron microscopy. The thickness of the single layers was then calculated. The information on the film properties was confirmed by electrical characterisation performed on metal/insulator/metal (MIM) structures. 

A.O. Konstantinov, C.I. Harris and E. Janzen, Electrical properties and formation mechanism of porous silicon carbide, Appl. Phys. Lett., 65, 2699-2701 (1994). 

In this section, we will discuss our studies on the electrical properties of nickel contacts formed on porous SiC layer via current-voltage (/—V) and capacitance-voltage (C-V) characterization. 

Important electrical properties of porous SiC are discussed in Chapter 9. Not surprisingly, porous SiC has a higher specific resistivity than its host crystals. More significantly, pores appear to trap charge carriers, which renders p-SiC semi-insulating. Such effects strongly influence the use of porous material as electrical sensors. 

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