Design of oriented mesoporous silica films for guiding protein adsorption states

Abstract

The highly-oriented cylindrical mesoporous silica films were synthesized on the rubbing-treated polyimide by adjusting the molar ratio of the orientation-directing agent (Brij56) to the structure-directing agent (P123) as surfactants in...

Investigation into self-assembled collagen arrays guided by the surface properties of polyimide films

“…In detail, the absorbance due to CO (imide group) increased and those due to CC (benzene rings), C–N and C–O–C decreased with increasing the θ value from 0° to 90°, indicating that the orientation of surface functional groups of the PI films was controlled by the rubbing treatment, which is consistent with our previous reports. 20,24 The CO bonds have the transition moments perpendicular to the rubbing direction and the CC, C–N and C–O–C bonds have the transition moments parallel to the rubbing direction for the rubbed PI films. The O.D.…”

“…The absorbance in the wavenumber range between 1200 and 1800 cm À1 was measured under the same condition mentioned above. According to our previous reports, 20,24 we defined the degree between the polarization direction and the rubbing direction as y. The state indicates ''polarization direction//rubbing direction'' which was named ''y = 01'' (Fig.…”

“…The rubbed polyimide (PI) films have been widely used to control the orientation of liquid crystals, 17,18 mesoporous silica 19,20 and copolymers 21 due to the physicochemical anisotropy. The physical anisotropy would be derived from the nanooriented grooves parallel to the rubbing direction, which was caused by the surface abrasion because of the rubbing treatment.…”

Adsorption of Porphyrin in Orthogonally Stacked Mesoporous Silica Films: Implications for Surface Modification of Biomedical Polyimide

“…MPS films were synthesized according to our previous report . In detail, the precursor solutions were prepared by mixing TEOS, ultrapure water, ethanol, HCl, P123, and Brij 56, where the molar proportion was (TEOS) 1: (ultrapure water) 1.5: (ethanol) 4: (HCl) 6 × 10 – 3 : (P123) 9 × 10 – 3 : (Brij 56) 2.7 × 10 – 2 .…”

“…The MPS is a mesostructured silicate with higher surface area, thermal stability, and mechanical stability. − In addition, MPS also has the advantage of high biocompatibility due to its amorphous framework, and it has been extensively researched as a bioceramic in recent years. Furthermore, the mesostructure, pore orientation, and pore size of MPS can be easily controlled by adjusting the type and concentration of the supramolecular templating surfactant. − According to the previous report in our group, the PI catheter surface modified by coating the oriented cylindrical MPS film is more suitable for applications in the biomedical field . In addition, the isotropic mechanical properties were also required for flexible PI catheters.…”