A New Slip Length Model for Enhanced Water Flow Coupling Molecular Interaction, Pore Dimension, Wall Roughness, and Temperature

In this paper, a slip length model is proposed to analyze the enhanced flow based on the Hagen–Poiseuille equation. The model considers the multimechanisms including wall-water molecular interactions, pore dimensions, fractal roughness, and temperature. The increasing wall-water interactions result in the greater slip length and flow enhancement factor. The increased temperature enhances the kinetic energy of water molecules that leads to great surface diffusion coefficient and small work of adhesion. The wall roughness can decrease the slip length and flow enhancement factor in hydrophilic nanopores. This work studies the effects of multimechanisms on slip length and flow enhancement factor theoretically, which can accurately describe the liquid flow in nanopores.

Special Issue on “Transport of Fluids in Nanoporous Materials”

Understanding the transport behavior of fluid molecules in confined spaces is central to the design of innovative processes involving porous materials and is indispensable to the correlation of process behavior with the material structure and properties typically used for structural characterizations such as pore dimension, surface texture, and tortuosity. [...]

CHARACTERIZATION OF PROPERTIES OF PVDF/POLY(DIMETHYLSILOXANE) COMPOSITES SEPARATOR WITH BLENDING MEMBRANE METHOD

<span lang="IN">The aims of this research to make</span><span> poly(vinylidene fluoride) (PVDF) and poly(dimetilsiloksan) (PDMS) </span><span lang="IN">composites </span><span>separator with blending membrane method. </span><span lang="IN">Synthesized of<span> </span></span><span>PVDF/PDMS</span><span lang="IN"> composites separator </span><span lang="IN">used various ratio </span><span>were 10/0, 9/1, 8/2, and 7/3. The purpose of increasing concentration of PDMS</span><span lang="IN">/</span><span>PVDF to improve the performance of the composites separator which includes </span><span lang="IN">a</span><span> dimensions of porosity, </span><span lang="IN">a </span><span>pore density, and </span><span lang="IN">a </span><span>electrical conductivity. Based on crystallographic analysis using XRD, the </span><span lang="IN">increasing</span><span> concentration </span><span lang="IN">number </span><span>of PDMS </span><span lang="IN">to make compositess was influence</span><span> decreas</span><span lang="IN">ing of</span><span> crystallinity </span><span lang="IN">until </span><span>29.26% in </span><span lang="IN">a </span><span>ratio 7/3</span><span lang="IN">.</span><span lang="IN">The analysing of</span><span> FTIR </span><span lang="IN">have sound the wavenumber of each phase can distinguish, which </span><span>this material includes in the criteria </span><span lang="IN">of the </span><span>composites</span><span lang="IN">. The result using XRD and FTIR to material PVDF/PDMS composites in all of the ratio constituens have shown the identification of the structure </span><span>α-</span><span lang="IN">phase of PVDF. The increase of concentration number PDMS influenced decreasing of pore dimension and increasing of pore density </span><span>with the small </span><span lang="IN">of </span><span>pore dimension 1.71 µm and pore density 4.07x10¹¹ count/m²inthe ratio 7/3. In </span><span lang="IN">a</span><span> ratio 7/3, the value of the electrical conductivity w</span><span lang="IN">as </span><span>3.45x10^-4</span><span>S/cm and the resistance </span><span lang="IN">i</span><span>ncrease</span><span lang="IN">d</span><span> up to 80%.</span>

Pronounced effect of pore dimension of silica support on Pd-catalyzed Suzuki coupling reaction under ambient conditions

The pore size of the mesoporous silica support affects the reactivity of heterogeneous palladium catalysts in the Suzuki reaction under ambient conditions, which is leveled at higher temperature.