Bulk quantities of electrically conducting nanotubes of polypyrrole having narrow pore diameter (6 nm) can be synthesized rapidly by chemical oxidative polymerization of pyrrole in the presence of stoichiometric amounts of V2O5 nanofibers. The V2O5 nanofibers act as templates for polymerization and yield, as the initial product, polypyrrole nanotubes with pores filled with V2O5. The V2O5 dissol...

Diffusion Phantom Michal Komlosh 1, Evren Ozarslan 1, Martin Lizak 1, Ferenc Horkay 1, Peter Basser 1 1 National Institute of Health Introduction: Diffusion MRI methods can provide valuable microstructural in­ formation about tissues and porous media within an imaging volume [1-3], how­ ever, calibrating them is problematic owing to the lack of suitable anisotropic diffusion MRI phantoms. Here ...

a simple method for fabrication of highly ordered gold nanorod film is introduced in this article. the procedure is based on thermal evaporation of gold into a porous anodic alumina film (paa). the ppa film was fabricated by combining the hard and mild anodization. this combination effectively decreases the processing time of fabrication of highly ordered porous anodic alumina film with control...

Nuclear Magnetic Resonance (NMR) cryoporometry is a technique for non-destructively determining pore size distributions in porous media through the observation of the depressed melting point of a confined liquid. It is suitable for measuring pore diameters in the range 2 nm – 1 μm, depending on the absorbate. Whilst NMR cryoporometry is a pertabative measurement, the results are independent of ...

Using a lattice-gas model in mean-field theory, we discuss the problem of how adsorption and desorption of fluids in independent cylinderlike pores is influenced by variations in the pore diameter along the length of the pore, surface roughness of the pore walls, and chemical heterogeneity. We also consider the impact of contact with the bulk phase via the pore opening and the possibility of in...

Encapsulation of healing agents embedded in a material matrix has become one of the major approaches for achieving self-healing function in cementitious materials in recent years. A novel type of microcapsules based self-healing cementitious composite was developed in Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University. In this study, both macro p...

Porous crystalline materials with a well-defined pore size distribution are essential for applications in gas storage, catalysis, separation, optics and chemical sensing. Specifically, large pores reaching several nm diameter permit the design of a multitude of nano-devices interacting with large guest molecules. To gain maximum control over local structure, chemistry and physics in the pore sy...

A simple method for fabrication of highly ordered gold nanorod film is introduced in this article. The procedure is based on thermal evaporation of gold into a porous anodic alumina film (PAA). The PPA film was fabricated by combining the hard and mild anodization. This combination effectively decreases the processing time of fabrication of highly ordered porous anodic alumina film with c...