Zhejiang University, Huang Xiaojun team PVDF oil-water separation membrane made progress series biological detection field gradient sensing membrane
(a) ACS Appl Mater.Interfaces :.material new results frequent oil spills and industrial oily wastewater the massive emissions seriously pollute the environment and endanger human health, especially acidic oily wastewater and industrial fields generated in recent years has aroused widespread concern, the development of suitable acidic environment and excellent acid stability of oil-water separator materials imminent, become a research hotspot one. Polyamide – amine (of PAMAM) dendrimers have a large number of molecules outside of , and increases the number of amino algebraic increases, a large number of active sites under acidic conditions, is expected to continue to address this challenge. This membrane structure from the design team, select no dense skin PVDF membrane as a base material, the first acrylic acid grafted PVDF (PVDF-g-PAA) separation membranes prepared by cold plasma polymerization techniques. On this basis, the amide functionalized SiO 2 nanoparticles grafted onto PVDF-g-PAA improve the surface roughness of the film surface; further, by interfacial polymerization (IP) technology PAMAM dendrimers fixing to improve the surface energy on the film surface. Through the micro-nano-roughness, high surface energy, combine multiple amino acidic environment in response to site-modified to achieve a superhydrophilic film and underwater superoleophobic properties; water contact angle and the contact angle of the resulting modified subsea oil film respectively 0 ° and 150 °, at 0.9 bar higher than the flux of 3100 L / (m 2 · h)], the separation efficiency is higher than 99%. Most importantly, the PAMAM chain amino group by protonation under acidic conditions so as to extend from a collapsed state to a full state of loose, imparting a film having a more excellent anti-adhesion properties droplets, pollution resistance, stability and reusability. This working emulsion corrosive oil-water separation under acidic conditions provides a good application prospect is. In related outcomes \”Fabrication of pH-sensitive superhydrophilic / underwater superoleophobic poly (vinylidene fluoride) -graft- (SiO2nanoparticles and PAMAM dendrimers) membranes for oil-water separation \”was published in high level journals ACS Applied Materials & Interfaces (IF = 8.456). The first author of the paper Zhejiang University, postdoctoral polymer Science and Engineering Department, Associate Professor Huang Xiaojun team ; corresponding author for the School of materials Science and Engineering, Tianjin Polytechnic University, Professor Chen Li and polymer Science, Zhejiang University . and Engineering Huang Xiaojun associate professor this work was funded by the national Natural Science Foundation of China, Zhejiang Provincial Natural Science Foundation and other projects (b) Anal Chem …: gradient sensing membrane biological testing new results in recent times, with the risk of sudden infectious diseases facing humanity increased, the scene of low concentrations of biomarkers of efficient and reliable rapid detection is the key to winning the battle of prevention a. immediately detect (Point-of-careTesting, POCT) technology from place and time constraints, the use of portable instruments and reagents, promote health, widely used in the field of disease diagnosis, biological emergency, inspection and quarantine, etc. this technique does not require dependent on large-scale chemical and biological equipment inspection, does not require complex device fabrication process and shorten the time-consuming diagnosis and broaden the scope of application, with a particularly significant medical value. this team used three-dimensional gradient-dimensional microporous membrane has a unique microstructure with microfluidic technology, proposed a \”lab-on-hollow fiber membrane (HFM)\” new concept of three-dimensional microfluidic , based on the gradient microporous membrane constructed multi-channel microarray platform, and for multifunctional immediately detect biomarkers. herein, the microporous membrane having a pore size gradient and is used as a high throughput hydrophilic microfluidic device substrate, the membrane pores selectively trapped within the inner surface of the macromolecule, while allowing free diffusion of small molecules microfluidic .3D-HFM model detection apparatus is very close to the Lucas-Washburn and Laplace model, indicating the detection of the liquid from the driving fluid to promote upward flow through a micro capillary action. Glucose, for example, by electrostatic interaction of the highly sensitive fluorescent or optical chromogenic reagent is immobilized in the HFM. Produced enzymes react with glucose hydroxyl radical quenching occurs so PyroninG fluorescent reagent, the glucose concentration quenching efficiency was a good linear relationship (1~22mM, R 2 = 0.997). In addition, the sensor platform may also be used to analyze urine protein or glucose detection in the visible spectrum, it has a wide range of tests. Compared with the conventional two-dimensional device, this 3D-HFM microfluidic device exhibits excellent versatility and homogeneity, and having a greater dynamic range of detection, high sensitivity and accuracy of response. The biosensor platform integration of target molecules selectively screening, enzyme identification, signaling biomolecules and read as a whole, this rapid detection devices based on the new biological polymer hollow fiber membrane substrate in a biochemical detection and biosensing field has great prospects. related to the outcome of \”Three-dimensionalmicroporous hollow fiber membrane microfluidic device Integrated with selectiveseparation and capillary self-driven for point-of-care testing\” published in the journal at a high level Analytical Chemistry [123 ] (IF = 6.35), the first author of the paper for the polymer PhD student of Zhejiang University Science and Engineering Associate Professor Huang Xiaojun team Huimin WU ; corresponding author for the Department of polymer Science and Engineering, Zhejiang University [123 ] Huang Xiaojun associate professor , Professor of Hangzhou Normal University School of Medicine Chen Jing . This work was funded by the National Natural Science Foundation of China, Zhejiang Provincial Natural Science Foundation and other projects.