Triboelectric nanogenerators (TENGs) have emerged as viable micro power sources for an array of applications. Since their inception in 2012, TENGs have been the subject of significant advancements in terms of structural design and the development of friction materials. Despite these advancements, the complexity of their structural designs and the use of costly friction materials hinder their practical application. This study introduces a simplified TENG model utilizing an economical composite film of fullerene carbon soot (FS)-doped polydimethylsiloxane (PDMS) (FS-TENG). It confirms the FS-TENG’s ability to convert mechanical energy into electrical energy, as demonstrated through experimental validation. The generated electricity by the FS-TENG can power devices such as light-emitting diodes (LEDs), digital watches, kitchen timers, and sports stopwatches, highlighting its efficiency. This research enhances the development of TENGs featuring low-cost, streamlined structures for sustainable and autonomous energy sensing applications.

The catalytic activity of many Lewis and Bronsted acid for the synthesis of diethyl carbonate (DEC) from ethyl carbamate (EC) and ethanol was evaluated in a bath reactor. Pyrophosphoric acid (H₄P₇O₂) which showed the best activity was selected to further investigate the effect of reaction conditions, such as reaction temperature, catalyst dose and reaction time, on the yield of DEC. Under the optimal conditions, DEC yield can reach 29.1%.

Study of a Mechatronic Device for Unwinding and Broaching Rolled Materials in Discrete Mode

As an aquaculture waste, the veined red snail achieves significant ecological burden reduction through recycling. Compared with polycaprolactone (PCL), it boasts greater environmental and economic advantages. Veined red snail powder with different proportions was added to PCL—a common material for manufacturing bone scaffolds—and laser sintering technology was used to prepare veined red snail powder/PCL composite powder laser-sintered parts. Based on single-factor experiments, the process was optimized using the response surface methodology, and the parts with different veined red snail powder additions were studied. The results show that under the process conditions of laser power 12.25 W, scanning speed 0.7 m s ⁻¹ , scanning spacing 0.14 mm, and layer thickness 0.17 mm, the tensile strength of the laser-sintered part reaches 7.59 ± 0.16 MPa, with an error of 1.93% compared with the model prediction value. Under these process conditions, the laser-sintered parts with different veined red snail powder additions were characterized separately. The addition of shell powder effectively reduces the economic cost of the laser-sintered parts and significantly improves their surface hardness and hydrophilicity. When the addition amount ranges from 0 to 25 wt%, the hardness increases by up to 32.08% relative to pure PCL parts, and the hydrophilicity (contact angle) changes from 87.86 ± 0.53°to 72.58 ± 0.95°(a smaller contact angle indicates better hydrophilicity).