Research Dialysis Membranes

Cellulose-based membranes are manufactured from natural or regenerated cellulose materials, featuring a uniform pore structure that effectively retains biomolecules such as proteins, nucleic acids, and colloids while allowing the passage of salts, solvents, and small-molecule metabolites. These membranes are commonly employed in pharmaceutical purification, biotechnology research, and laboratory-scale dialysis applications.

Polysulfone (PS) membranes feature a unique asymmetric pore structure that efficiently retains proteins, colloids, and fine particles while allowing water and small-molecule solutes to pass through. Fabricated from polysulfone polymer material, these membranes combine high mechanical strength with oxidation resistance, maintaining long-term stability even in harsh environments such as strong acid, strong alkali, or organic solvent systems.

Polyethersulfone (PES) membranes represent high-performance separation membranes due to their outstanding chemical stability, high-temperature resistance, and excellent film-forming properties. Their unique asymmetric pore structure precisely retains proteins, colloids, and fine particles while allowing efficient passage of water and small-molecule solutes. PES membranes also combine high mechanical strength with chlorine resistance, maintaining stability across a wide pH range of 1–13.

Polyamide membranes are renowned for their unique molecular sieve structure and exceptional chemical stability, achieving high-precision retention through a dense selective separation layer. Their surface features polar groups that efficiently intercept dissolved organic matter, salts, and small-molecule contaminants (such as heavy metal ions and pesticide residues) while allowing selective permeation of water molecules.

Polyacrylonitrile (PAN) membranes are renowned for their unique pore structure and high chemical stability. Prepared via phase inversion or electrospinning processes, they form separation layers with asymmetric pore size distributions. Their surfaces are rich in polar cyano groups (-CN), enabling efficient retention of micron-sized particles, colloids, proteins, and certain macromolecular organic compounds (such as dyes and polysaccharides).

Polyvinylidene fluoride (PVDF) membranes exhibit hydrophobic surfaces or can be modified to possess hydrophilic properties, featuring uniform and controllable pore size distribution. Their unique fluorinated polymer structure endows the membrane material with exceptional oxidation resistance (tolerating strong acids, strong alkalis, and organic solvents), UV aging resistance, and excellent thermal stability (withstanding long-term operation at temperatures up to 140°C).

Polytetrafluoroethylene (PTFE) membranes feature a unique fully fluorinated carbon chain structure, along with exceptional chemical inertness, high-temperature resistance, and superhydrophobic/oleophobic properties. Their surface energy is extremely low, exhibiting minimal adsorption of any substances. With a uniform and controllable pore size distribution, they efficiently retain fine particles, colloids, bacteria, and viruses.

Nylon membranes feature a unique polyamide molecular chain structure, combining excellent mechanical strength, chemical resistance, and thermal stability. Their surfaces exhibit mild polarity, enabling moderate adsorption and separation of specific substances. With uniform and controllable pore size distribution, they effectively retain micron- to nanometer-sized particles, proteins, and macromolecules.

Filters and equipment integrate multifunctional material design, offering excellent chemical compatibility, thermal stability, and mechanical strength. Their precisely controllable pore size gradient distribution enables effective separation of components ranging from micron-sized particles to biomacromolecules, while maintaining low non-specific adsorption characteristics to ensure high recovery rates and high-purity output.