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Oil-based drill cuttings (OBDCs), which contain various petroleum hydrocarbons, heavy metals, and alkaline salts, will significantly affect the local ecosystem if left untreated. Supercritical water oxidation (SCWO) is regarded as a potential end-of-pipe technology that is able to degrade organic compounds, stabilize heavy metals, and neutralize alkaline salts simultaneously. In this paper, SCWO of OBDCs was carried out using a batch reactor. Six organic compounds and eight elements were selected as representatives of the petroleum hydrocarbons and heavy metals, respectively, in OBDCs. The effects of the oxygen coefficient (OC), temperature (T), and reaction time (t) on the degradation of petroleum hydrocarbons and the stabilization of heavy metals were evaluated in detail. The results indicated that nearly 100% of naphthalenes and more than 97% of alkanes could be destroyed when T > 475 °C, t > 2 min, and OC > 2.5. The elements Ba, Cr, and Pb were almost completely stabilized in the solid products, and small amounts of Zn and Cu were detected in the liquid products. More than the original contents of Fe, Cr, and Ni were found in the solid products due to the corrosion of the SCWO reactor. The content of alkaline salt in the feed was too low to affect the pH of the liquid products. The results of X-ray diffractometer (XRD) and scanning electron microscope (SEM) analyses suggested that SCWO can efficiently remove organic pollutants from OBDCs but does not obviously affect the microstructure and composition of the inorganic compounds.

A kind of novel 3-D cross-linked supramolecular structured hydrogels has been fabricated via enzymatic oxidative coupling of polypseudorotaxanes (PPRs) derived from the self-assembly of α-cyclodextrins (α-CDs) with 3-arm p-hydroxyphenylpropionate terminated PEG (3-HPPP) as a macromer by using horseradish peroxidase (HRP)/H2O2 catalytic system. The enzymatic cross-linking of the macomer or PPRs made with a smaller amount of α-CDs was found to be much faster than that by ordinary chemical pathways, showing the promise to be used as the surgical adhesive and sealant which are needed to rapidly function in vivo. The gelation time was highly extended and the gel content was considerably decreased by increasing the α-CDs to macromer feeding molar ratio. Thereby these hydrogels exhibited a decreasing trend in dynamical mechanical properties with increasing the amount of α-CDs in regard to the blank hydrogel made without α-CD addition.

A novel COB (chip-on-board) structure with integrated multifunction is presented. The structure is prepared by laminating copper plate with FR4 board and then coating with a silver layer to offer high reflectivity and high conductivity. In comparison with MCPCB (aluminum) and ceramics (Al2O3) board, the substrate brings about 10% higher light extracting efficiency than aluminum board and 5% higher flux maintenance ratio than ceramics (Al2O3) board at 3000 h. With integrated multifunction, through an IC component driving high voltage serial LED chips, the COB can be directly connected to AC 110 V or 220 V power supply in lighting application.