Polycarbonate Membrane Filtration
Polycarbonate Membrane Filtration - Related Videos
08:18
Construction Methods for Hybrid Polycarbonate-Silicon Microfluidic Devices
0 Views •
2026
This protocol describes three straightforward sealing methods for fabricating a hybrid microfluidic device that integrates polycarbonate and silicon components. By implementing solvent bonding, thermal compression, and mechanical compression strategies, we enable reliable, low-temperature sealing techniques that avoid specialized equipment for hybrid microfluidic devices.
01:32
Filtration and Urine Formation
0 Views •
2019
The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys. Blood enters the renal...
01:26
Glomerular Filtration: Net Filtration Pressure
0 Views •
2025
Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP). GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal tubule,...
10:58
Isolation of Fecal Bacteria from Water Samples by Filtration
0 Views •
2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Luisa Ikner The quality of water destined for use in agricultural, recreational, and domestic settings is of great importance due to the potential for outbreaks of waterborne disease. Microbial agents implicated in such events include parasites, bacteria, and viruses that are shed in high numbers in the feces of infected people and animals. Transmission to new and susceptible hosts may...
00:53
Filtration
0 Views •
2024
Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
FAQs
Retention is governed primarily by the size relationship between particles and the membrane’s precisely formed cylindrical pores. Particles larger than the available passage are retained, while fluid and smaller solutes can pass through. Selecting a pore diameter therefore sets the size-exclusion boundary and directly affects whether cells, microorganisms, or other particulates remain on the membrane.
Pressure or vacuum supplies the driving force that moves the sample through the membrane, while flow conditions influence how consistently the size-based barrier operates. Because separation depends on pore diameter, particle size, and flow behavior together, these conditions should be selected and controlled according to the material being processed. The result is a more interpretable retained fraction and filtrate.
The membrane’s visual transparency allows direct microscopic examination of retained material rather than relying only on indirect measurements. Its uniform pores also support consistent filtration performance, so observed cells, microorganisms, or particulates can be related to a defined size-exclusion process. This combination is useful when researchers need to connect filtration results with the appearance of captured material.
First, the membrane is chosen with a pore diameter suited to the particle-size separation required. A biological sample is then driven through it by pressure or vacuum. Larger retained material remains on the membrane, while fluid and smaller solutes form the passing fraction. The retained material can be examined microscopically, and the clarified or separated fluid can proceed to downstream assays.
It supports capture of cells and microorganisms when those components must be retained from a biological fluid. The same size-selective step can clarify samples by removing particulate material, support particulate analysis, or prepare a fluid for a later assay. These uses make the technique relevant when both physical separation and observation of retained material are important.
The membrane creates two useful outputs: material retained at the surface and fluid that passes through with smaller solutes. The retained fraction can reveal the presence and appearance of captured cells, microorganisms, or other particulates through direct microscopy. The passing fraction can be used as clarified or size-selected sample material for downstream bioengineering assays.