이영관

Polymeric binder is extremely important for Si-based anode in lithium-ion batteries due to large volume variation during charging/discharging process. Here, natural rubber-incorporated chitosan networks were designed as a binder material to obtain both adhesion and elasticity. Chitosan could strongly anchor Si particles through hydrogen bonding, while the natural rubber could stretch reversibly during the volume variation of Si particles, resulting in high cyclic performance. The prepared electr

In this work, the ferrocene-encapsulated Zn zeolitic imidazole framework (ZIF-8) was prepared by the self-assembly of Zn ions and 2-methylimidazole and used for the dual detection of amyloid-beta oligomers (AβO), which is the main neuropathological hallmark of Alzheimer's disease. Ferrocene is an optically and electrochemically active signal which was successfully encapsulated inside of the ZIF-8 and released by the competitive coordination between Zn ions and AβO after being treated with AβO. T

Abstract The thermal behavior, thermal degradation kinetics, and pyrolysis of resol and novolac phenolic resins with different curing conditions, as a function of the formaldehyde/phenol (F/P) molar ratio (1.3, 1.9, and 2.5 for the resol resins and 0.5, 0.7, and 0.9 for the novolac resins) were investigated. The activation energy of the thermal reaction was studied with differential scanning calorimetry at five different heating rates (2, 5, 10, 20, and 40°C/min) between 50 and 300°C. The activa

Abstract: In the manufacture of plastic containers, various materials such as additives (for example, plasticizers, stabilizers, antioxidants), polymers (for example, polystyrene [PS], polycarbonate [PC], polyvinyl chloride [PVC]) are widely used. Endocrine disrupting chemicals [EDCs] can migrate as residual monomers (for example, styrene for PS or bisphenol A [BPA] for PC) presented in polymers, as additives (for example, phthalates for PVC) used in polymer manufacturing, and/or as contaminants

MnO2/graphene composites were prepared for the electrode material of supercapacitors. MnO2 was synthesized on a gold plate by the electrodeposition method. Graphene prepared by thermal CVD was transferred onto the MnO2 layer. These processes were repeated to make multilayer structures. The optimal performance of the MnO2/graphene composite was examined as a function of the number of graphene layers in MnO2. The morphology of MnO2 on graphene was confirmed by SEM and TEM, and the capacitance of t

The use of home country nationals is restricted in international operations partly because of differing attitudes in the host country. This study employed the concept of socialization to predict that expatriates partially adopt host country attitudes. Results support the socialization predictions and suggest the needforfurther examination of actual expatriate performance. A continuing problem in firms operating across international borders is determination of the preferred nationality mix of exe