Pore Structure
Pore Structure - Related Videos
01:23
Pore Size Distribution
0 Views •
2024
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio. Adequate...
12:19
Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo
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Cited by 4 •
2013
In this video, we will demonstrate modification techniques for porous metallic implants to improve their functionality and to control cell migration. Techniques include development of pore gradients to control cell movement in 3D and production of basement membrane mimics to control cell movement in 2-D. Also, a HPLC-based method for monitoring implant integration in-vivo via analysis of blood proteins is described.
11:20
Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry
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Cited by 4 •
2014
A procedure for creating and imaging capillary bridges in slit-pore geometry is presented. The creation of capillary bridges relies on the formation of pillars to provide a directional physical and chemical heterogeneity to pin the fluid. Capillary bridges are formed and manipulated using microstages and visualized using a CCD camera.
13:46
A Facile and Eco-friendly Route to Fabricate Poly(Lactic Acid) Scaffolds with Graded Pore Size
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Cited by 18 •
2016
In this work, poly(lactic acid)/polyethylene glycol (PLA/PEG) scaffolds were prepared by using a combination of melt mixing and selective leaching. The method herein discussed permitted to develop three-layer scaffolds by highly controlling both porosity and pore size. The mechanical properties were also evaluated in a physiological environment.
07:07
Creating Transient Cell Membrane Pores Using a Standard Inkjet Printer
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Cited by 23 •
2012
A description of the methods used to convert an HP DeskJet 500 printer into a bioprinter. The printer is capable of processing living cells, which causes transient pores in the membrane. These pores can be utilized to incorporate small molecules, including fluorescent G-actin, into the printed cells.
FAQs
Pore size controls the available space for fluid or gas movement, while tortuosity describes how indirect the pathways are. Larger pores can provide more room for transport, whereas highly tortuous paths make movement less direct. Together, these features influence permeability and diffusion, helping engineers predict whether a material will favor rapid flow, restricted movement, or longer residence within its pore network.
Pressure gradients promote movement through connected voids, capillary forces affect behavior at pore walls, and diffusion supports transport through concentration-driven spreading. Their interaction means that pore structure cannot be evaluated from pore volume alone. Engineers consider these effects together when assessing how fluids and gases enter, move through, or leave a porous material.
A material may contain many voids yet provide limited transport if those voids are poorly connected. Connectivity determines whether a continuous route exists, while porosity indicates how much void space is present. This distinction is important when engineers seek both storage and movement, because disconnected pores may contribute to capacity but not to effective flow or reaction access.
Pore shape influences how much wall area and pathway space are available, while distribution determines where different pore sizes occur throughout a material. These characteristics affect how readily matter can interact with pore walls, which is relevant to adsorption, and how easily reactants can reach locations where reactions occur. Engineers therefore study them when designing materials that need storage or reaction access.
An evaluation should consider size, shape, distribution, connectivity, and tortuosity, then relate those features to the intended function. For a flow-oriented design, permeability and transport are central; for a storage-oriented design, adsorption may matter more. Linking structural characteristics to the desired outcome helps engineers compare materials and identify useful tradeoffs.
Engineers tailor pore structure in filters, catalysts, membranes, batteries, fuel-cell components, and cement-based materials. In filters and membranes, controlled transport is central; in catalysts, pore access supports reactions. Battery and fuel-cell components depend on controlled movement of matter, while cement-based materials raise concerns about mechanical performance and durability. The relevant design target therefore varies by application.
Environmental treatment relies on controlling how fluids and gases move through porous systems, making permeability, diffusion, and adsorption important design considerations. Infrastructure applications, including cement-based materials, require attention to how void-space characteristics affect mechanical performance and durability. Across both settings, adjusting porosity and connectivity can support flow management while balancing structural and long-term service requirements.