Electrostatic Repulsive Features of Free-Standing Titanium Dioxide Nanotube-Based Membranes in Biofiltration...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Renal Replacement Therapy

Background:

• Developing advanced membranes for artificial kidney applications is crucial for improving hemodialysis and exploring biofiltration.
• Titanium dioxide nanotube (NT)-based membranes offer potential due to their biocompatibility and tunable properties.

Purpose of the Study:

• To investigate the electrostatic repulsive features and biofiltration performance of electrochemically fabricated titanium dioxide nanotube membranes with varying surface nanomorphologies.
• To assess creatinine clearance and blood protein rejection in cross-flow biofiltration for artificial kidney models.

Main Methods:

• Fabrication of titanium dioxide nanomembranes with different nanomorphologies (nanotubes, nanowires) via multi-step anodic oxidation.
• Characterization using scanning electron microscopy, atomic force microscopy, water contact angle, X-ray diffraction, and energy-dispersive X-ray spectroscopy.
• Performance evaluation in 3D printed flow cells, measuring creatinine clearance and bovine serum albumin rejection.

Main Results:

• Membranes maintained over 90% creatinine clearance with good antifouling behavior.
• A nanotube morphology showed approximately 20% rejection of negatively charged 66 kDa blood albumin.
• Shifting nanomorphology to nanowires reduced pure water flux and bovine serum albumin rejection.

Conclusions:

• Electrostatically negative titanium dioxide nanotube membranes exhibit potential for artificial kidney biofiltration.
• Surface nanomorphology significantly influences membrane performance, particularly protein rejection.
• Further optimization is needed to enhance blood protein rejection while maintaining high toxin clearance.