FAS grafted superhydrophobic ceramic membrane

Preparation, characterization and laboratory-scale application of modified hydrophobic aluminum oxide hollow fiber membrane for CO2 capture using H2O as low-cost absorbent

“…In addition, it can be noted also that the drop is symmetrical around its vertical axis and this can mean that there is not no external force parallel to the modified hydrophobic Al 2 O 3 hollow fiber surface [46]. On the basis of previous experimental studies [31,47], here it can speculate that the FAS molecules are able to generate silanol grups (=S-OH) by hydrolysis, which can react by dehydration reaction with free hydroxyl groups (-OH) on the membrane surface and pores -without modifying the surface appearance (See Figure 2,3,4) -to form a stable thin film of grafted polysiloxane groups (see Figure 5) with a hydrophobic character (See Figure 6). Fig.…”

Mesoporous Fluorocarbon‐Modified Silica Aerogel Membranes Enabling Long‐Term Continuous CO2 Capture with Large Absorption Flux Enhancements

“…Therefore, Al 2 O 3 /SiO 2 -FAS membranes with different proportions of FAS were prepared and their CO 2 absorption was tested, as shown in Figure 6. [32] The surface contact angle of the Al 2 O 3 / SiO 2 membrane after five FAS modifications was the same as that for four FAS modifications because the saturation of FAS grafted onto the membranes had been reached. The increase in surface contact angles of the modified membranes resulted from the increase in the number of FAS modifications, that is, as a result of self-grafting of the FAS molecules onto the original FAS molecule grafted onto the membrane.…”

Hydrophobic Al₂O₃ Membrane for Sucrose Concentration via Vacuum Membrane Distillation System

“…The surface modification was conducted in reference to the procedures of Lu et al (2009) with modifications. The Al 2 O 3 membranes were first cleaned via ultrasonication in n-hexane (purchased from Wako Pure Chemical Industries, Ltd.) for 5 min, and then dried at 100°C for 24 h. The dried membranes were immersed into 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (FAS, purchased from Tokyo Chemical Industry) in n-hexane solution at 25°C for 6-24 h. The concentration of the FAS/n-hexane solution was 10 mmol/L.…”

“…So far, chemical modifications of such membranes to obtain a higher hydrophobicity have been investigated. Surface-modified ceramic membranes have been applied in membrane distillation process for desalination (Hendren et al, 2009;Lu et al, 2009;Fang et al, 2012;Kujawa et al, 2014) and removal of alcohols (Suk et al, 2010). However, hydrophobic ceramic membranes have not been applied for concentration processes.…”