Transitional Nanochannels

Transitional channels Transitional microchannels Transitional nanochannels Nanochannels ... 

Conventional channels Mini-channels Micro-channels Transitional channels Molecular nanochannels... 

NMR has also been used to investigate iron containing silicates and borosilicates/ " the internal structure of Beta/MCM-41 and ZSM-5/MCM-41 composites/ diffusion in silicon imidonitriles, several carbonaceous materials,transition-metal-complex nanochannels, and microporous silica materials. " ... 

Fig. 2 The measured conductance of a nanochannel as a function of electrolyte concentration showing the transition horn the expected behavior (lines) to a conductance determined by the surface charge. Panels (a) and (b) show the setup of the experiment [8]...

Berwanger R, Henschel A, Knorr K, Huber P, Pelster R (2009) Phase transitions nd molecular dynamics of n-hexadecanol confined in silicon nanochannels. Phys Rev B 79 125442 Buttard D, Bellet D, Dolino G (1996a) X-ray diflffaction investigation of the anodic oxidation of porous silicon. J Appl Phys 79 8060-8070... 

A typical magnitude of the mean free path I in equilibrium air under standard conditions is about 5 x 10 m. Thus, if a channel has a cross-section size a in the range from 10 m to 10 m, then the Knudsen number Kn = -g/a is not so small in order to use the approach based on continuum mechanics. In this case, gas flows must be considered on the kinetic level, i. e. the methods of rarefied gas dynamics based on the Boltzmann equation must be used. The advantage of the kinetic approach is that it is applicable for any value of the Knudsen number, namely for very small values (Kn 1) corresponding to the channel size larger than 10 m (microchannels), for transitional values (Kn 1) when the size a is about 10 m, and for large values (Kn 1) if the channel size is close to 10 m (nanochannels). Thus, the kinetic equation is a tool allowing us to have a unique approach to micro- and nanochannels. 

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