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Highlights The radial and translational motions of two interacting bubbles are studied. Bubble dynamics is analyzed by bifurcation structures and acoustic emission spectra. Small bubble is remarkably suppressed, while large bubble is slightly enlarged. Bubble−bubble interaction reduces the nonlinear dynamics and acoustic emissions. Viscoelasticity of the medium reduces the radial and translational bubble motions.

The addition of lipid was inhibitory to the formation of most sulfur-containing compounds in the Maillard reaction. Furthermore, Maillard reaction products influenced the formation of products from lipid oxidation.

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Phenolic foam with nanometer pore structure and high strength was prepared by using a novel foaming method of phenol-formaldehyde novolac resin solution under pressure. Pore structure and the effects of pressure and resin concentration on it were investigated. Results showed that the mean pore size decreases from 800 to 30 nm with the increase of resin concentration from 0.08 to 0.36 g/mL. The pressure has a great effect on the pore structure and an optimal range (2.0-4.0 MPa) at which the pore size is small in level of nanometer and has a good distribution. The nanometer pore structure resulted in significant improvement of compressive strength and thermal insulation properties of phenolic foam.