In view of the excellent mechanical properties of ultra-high strength to density ratio, super elasticity, pore volume and large energy absorption capacity, a three-dimensional (3D) pore material has been widely used in catalytic field of gas separation, sensing, tissue engineering, in many battery technology, ion exchange, micro-electronics, medical diagnostics and production, etc. play an important role. Recently, the School of Mechanical Engineering academician and professor Jiang Chong Wei Xueyong Germany Xi\’an Jiaotong University proposes a production method based on voice-activated polymer bubbles focused acoustic waves, and the preparation of polyvinyl alcohol (PVA) foam as a template, by freeze – thaw cycles, for the magic bubbles, pores finally made lipophilic gelling material having superhydrophobic and polyvinyl alcohol (PVA).
FIG. (A) is a surface acoustic wave microfluidic micro-bubble generating device of FIG., The size of the bubble generation can be controlled by the surface acoustic wave, FIG. (B) is a schematic three-dimensional porous material [ 123]
preparation of microbubbles based on a surface acoustic wave
in this study, a method for preparing a surface acoustic wave focused voice based on the bubble, applicable not only to produce oil gas microbubbles, but are also suitable for water generating gas microbubbles. Microbubbles size can be adjusted in real time by adjusting the input frequency or driving voltage of the focused acoustic wave. This method can achieve regulation of the size of microbubbles in the microsecond time, which can range from 10μm regulation to hundreds of microns.
Manufacturing of polyvinyl alcohol (PVA) hydrogel material pores
FIG. (A) is a polyvinyl alcohol (PVA) freeze-thaw cycles gel material for producing voids, FIG. (b) is polyvinyl alcohol (PVA) modified pore superhydrophobic after gelling materialPVA in the PVA foam pores in the gel material preparation process, the first micro-bubbles by the composition as a template, by repeating the freeze-thaw cycles gelled PVA foam. Using micro gas bubbles of different sizes can be obtained gel material having pores of different porosity. The study also overcomes the PVA gel hydrophilic properties of the material itself, by hydrophobic modification treatment, gives PVA having excellent porosity and lipophilic gelling material superhydrophobic, it successfully for oil / water separation experiments. Experimental results show that PVA can absorb superhydrophobic include silicone oils, FC-40, and Novec 7500, and other oils, highly reliable oil-absorbing ability, canEnough to be used repeatedly. This method provides a new approach for the synthesis of new materials pores, has great potential in many fields, including biological tissue engineering and materials manufacturing. Figure (a) affect the pore PVA gel material for oil absorption capacity of different oils (b) oil absorption cycle oil absorption capacity ofmore well-known in the international study published in a paper form Journal \”ACS Applied Materials & Interfaces\” (IF = 8.456), the paper entitled \”Acoustic-controlledBubbles Generation and Fabrication of 3D Polymer Porous Materials\”. Xi\’an Jiaotong University School of Mechanical Engineering Professor Wei Xueyong corresponding author for the paper, Professor Yu Ziyi Nanjing University is a co-author. Xi\’an Jiaotong University School of Mechanical Engineering doctoral student Kim a small pump is the first author of the paper, Xi\’an Jiaotong University was first author and corresponding author units. This work was supported by the National Natural Science Foundation and the Royal Society – funded Newton Fund and supported by the Ministry of Education, the International Joint Laboratory micro-nano manufacturing and testing technology and the State Key Laboratory for Manufacturing Systems Engineering.
FIG. (A) is a polyvinyl alcohol (PVA) freeze-thaw cycles gel material for producing voids, FIG. (b) is polyvinyl alcohol (PVA) modified pore superhydrophobic after gelling material
Figure (a) affect the pore PVA gel material for oil absorption capacity of different oils (b) oil absorption cycle oil absorption capacity of