A small-angle neutron scattering (SANS) porosimetry technique is presented for characterization of pore structure in nanoporous thin films. The technique is applied to characterize a spin-on organosilicate low dielectric constant (low-k) material with a random pore structure. Porosimetry experiments are conducted using a "contrast match" solvent (a mixture of toluene-d8 and toluene-h8) having t...

Optimizing crop rotations is one of the proposed sustainable management strategies for increasing carbon sequestration. The main aim this study was to evaluate DeNitrification-DeComposition (DNDC) model estimating soil parameters (temperature, moisture and exchangeable NO3? NH4+), yield nitrous oxide (N2O) emissions long-term multi-cropping systems in Hebei, China. validated using five years da...

Pore space controls the mechanical and transport properties of rocks. At laboratory scale, seismic modeling is usually performed in relatively homogeneous settings, influence pore on recorded wavefields determined by rock-fluid interactions. Understanding this dry rocks instrumental for assessing impact topology waves propagating heterogeneous environments, such as volcanoes. Here, we simulated...

First, we discuss network models and techniques for determining the pore-scale properties and characterisWhile network models of porous materials have traditionally been tics; second, we describe the regular and random porous constructed using regular or disordered lattices, recent developments allow the direct modeling of more realistic structures such as sphere media systems used to validate ...

Nuclear magnetic resonance (NMR) relaxometry tests, carried out on partially saturated porous media, convey information on the distribution of fluids within the pore space. Proper interpretation of this information requires a means to isolate the effects of pore structure (pore and throat shape and size distributions, spatial correlations, etc.) wettability and saturation history. A pore networ...

In this paper, the pore filling of spiro-OMeTAD (2,2(,7,7(-tetrakis-(N,N-di-pmethoxyphenylamine)9,9(-spirobifluorene) in mesoporous TiO2 films is quantified for the first time using XPS depth profiling and UV–Vis absorption spectroscopy. It is shown that spiro-OMeTAD can penetrate the entire depth of the film, and its concentration is constant throughout the film. We determine that in a 2.5-mm-...

Processes of ̄uid transport through underground reservoirs are closely related with microscopic properties of the pore structure. In the present work, a relatively simple method is developed for the determination of the topological and geometrical parameters of the pore space of sedimentary rocks, in terms of chamber-and-throat networks. Several parameters, such as the chamber-diameter distribu...