Preparation of Superhydrophilic Polyethersulfone by Sol-Gel Method

Abstract

Here a simple method was developed to fabricate hydrophilic Polyethersulphone film via a sol-gel process. The correspondent hydrophilicity was evaluated by infrared spectral analysis, X-ray photoelectron spectroscopy, the contact angle measurement, atomic force microscope and scanning electron microscope analysis, respectively. Both FTIR and XPS analysis indicated that the film surfaces have a relatively dense sol layer, which favors to become hydrophilic. AFM analysis demonstrated that the higher hydrophilicity was mainly attributed to the surface roughness, while SEM images show that the micro/nanometer crater-like protrusions appears on the film surfaces, whereas the spongy structures & the finger-like structures appear in cortex and intermediate layer respectively. This leads to the hydrophilic film forming after film being treated by sol-gel method.

Plugging Performance of a New Sulfonated Tannin Gel System Applied in Tight Oil Reservoir

“…Traditional measurement methods of Young's modulus include the optical lever stretching method, pulse excitation method, and acoustic resonance method [35][36][37], but none of these methods can be used to characterize micro-nano-scale materials. With the development of nanomechanical measure-ment technology, the atomic force microscope has become the most advanced and intuitive method for measuring small-scale materials [38][39][40][41]. Different from previous literature, the three new insights in this study mainly focus on the strengthening of the sulfonated larch gel structure system through the paraintermediate, the relationship between the gel storage modulus and Young's modulus of its dispersion, and the relationship between its mechanical strength and its macroscopic plugging performance.…”