Pore size control

Metaleorganic frameworks (MOFs) are a versatile category of porous coordination polymers which can be differentiated from other porous nanomaterials due to their fascinating properties such as adaptable surface chemistry, tuneable functionalities, and exceedingly large surface area and uniform/controllable pore size.

20p viberbers 09-08-2023 9 3   Download

Herein, environmentally benign chitin nanofiber (ChNF) membranes were fabricated by regulating suspension behavior. The introduction of zeolitic imidazole frameworks (ZIF-8) into the composite membranes led to the domain formation of ChNF derived by coordinative interaction, resulting in pore size-tunable membranes.

9p viginny 30-12-2022 14 2   Download

In clay-rich sedimentary rocks, the pore network is considered to play a key role in controlling transport properties. The pore size distribution (PSD) of clay-rich rocks, the geometrical features of the pore network, and the clay content are parameters governing the diffusion process through clay formations.

13p vironald 15-12-2022 7 2   Download

The sponge pores decorated with Au nanoparticles could effectively capture and concentrate microplastics in the pores from aquaes sample. Interestingly, the adjustable size of the sponge could allow the distance between the “hot spots” on the substrate surface to be controlled, hence controlling the SERS signal intensity.

8p thebadguys 15-01-2022 5 0   Download

The modeling and numerical simulation of mass transport in porous media is discussed in this work by using the so-called pore size distribution for computing transport properties. The pore-size distribution is a property of the pore structure of a porous medium. This can be used to estimate the different transport properties, amongst other, the permeability. By starting with a formula for the absolute permeability, the simulation of water and oil transport in reservoirs is considered by solving mass conservation equations with the help of the control volume method.

7p abcxyz123_02 03-03-2020 12 0   Download

A combination of gel-casting and polymeric foam infiltration methods is used in this study to prepare porous bodies of hydroxyapatite (HA), to provide a better control over the microstructures of samples. These scaffolds were prepared by impregnating a body of porous polyurethane foam with slurry containing HA powder, and using a percentage of solids between 40% and 50% w/v, and three different types of monomers to provide a better performance.

8p kequaidan1 16-11-2019 8 0   Download

The fabricated pores were found to be stable at ambient conditions and in water. The pore-size tuning technique was further tested on holes fabricated using a different process. In agreement with Chen et al. 5 ,we find that a focused electron beam with a spot size of a few nanometres can be used to drill holes in thin free-standing SiO2 membranes,with an estimated thickness of about 10 nm (Fig. 3a). Figure 3b,c shows a pore that has been drilled using an electron-beam intensity above 1×108 Am–2 .

5p quynho77 13-11-2012 59 0   Download

This handbook emphasizes the use of synthetic membranes for separations involving industrial or municipal process streams. Little will be said concerning the use of membranes in medical applications as in artificial kidneys or for controlled drug release. Most of the membrane processes are pressure driven. The notable exception to this is electrodialysis (ED) by which ions are separated under the influence of an electric field. In addition, the chapter on coupled transport covers processes which are driven under the influence of a concentration gradient....

619p gian_anh 18-10-2012 98 27   Download

In the last decade, we have witnessed a rapid growth in research and development of nanotechnology, especially nanostructured materials. Nanoporous materials as an important class of nanostructured materials possess high specific surface area, large pore volume, uniform pore size, and rich surface chemistry. These materials present great promises and opportunities for a new generation of functional materials with improved and tailorable properties for applications in adsorption, membranes, sensors, energy storage, catalysis and photocatalysis, and biotechnology, etc.

917p thix1minh 16-10-2012 116 18   Download

Increased miniaturization of the integrated chip has largely been responsible for the rapid advances in semiconductor device performance, driving the industry’s growth over the past decade(s). Soon the minimum feature size in a typical integrated circuit device will be well below 100 nm. At these dimensions, interlayers with extremely low dielectric constants (k) are imperative to reduce the cross-talk between adjacent lines and also enhance device speed. State-of-the-art non-porous, silicon-based low-k dielectric materials have k values on the order of 2.7....

76p chuyenphimbuon 21-07-2012 73 9   Download