Bioresorbable electronic technologies form the basis for classes of biomedical devices that undergo complete physical and chemical dissolution after a predefined operational period, thereby eliminating the costs and risks associated with secondary surgical extraction. A continuing area of opportunity is in the development of strategies for power supply for these systems, where previous studies demonstrate some utility for biodegradable batteries, radio frequency harvesters, solar cells, and others. This paper introduces a type of bioresorbable system for wireless power transfer, in which a rotating magnet serves as the transmitter and a bioresorbable antenna as the remote receiver, with capabilities for operation at low frequencies (<200 Hz). Systematic experimental and numerical studies demonstrate several unique advantages of this system, most significantly the elimination of impedance matching and electromagnetic radiation exposure presented with the types of radio frequency energy harvesters explored previously. These results add to the portfolio of power supply options in bioresorbable electronic implants.

To mimic the activity regulated by a cysteinate axial ligand in cytochrome P450 enzymes, metal tetrakis(4-carboxyphenyl)porphyrins (M TCPP) were immobilized on ZnS. They were characterized by a variety of spectroscopic techniques and were used as a catalyst for cyclohexane oxidation. The small amount of metal (Co, Fe, or Mn) TCPP (1.1 μmol) in the immobilized catalyst could be reused three times for oxidation, providing more than 6.5 × 10 5 turnover number and 20% molar yield of cyclohexanone and cyclohexanol (KA oil) on average. The coordination of ZnS played a key role. These catalysts were applied to green catalytic oxidation of cyclohexane to produce KA oil products.

The hydrogenation of levulinic acid (LA) to γvalerolactone (GVL) is an essential reaction step to produce valueadded renewable chemicals and fuels. In this study, it is demonstrated that the dispersed state of metal and the acid properties of the support can be tuned directly in the synthesized stage for the Ru/MCM-49 catalysts. The average metal particle size of Ru was found at ∼2.0 nm, and strong metal−support interaction was observed for the Ru/MCM-49(DP) catalyst. Mesopores presented can enhance the conversion rate for LA to GVL. The presence of a higher amount of Lewis acid sites can promote the ring closure esterification of the intermediate 4-HPA. High catalytic activity with a TOF value of >3000 h −1 , as well as excellent reusability, were achieved by Ru/MCM-49(DP). The agglomeration of Ru particles and the coke formation were thought to be responsible for the deactivation of the catalyst.

The enhancement of critic acid amount strengthened the sol–gel reaction between critic acid and metal ions, showed an important role on the structure properties of magnetic Fe–Ce–W mixed oxide catalyst, thereby affected its NH3-SCR activity.