Compared to C60, carbon nanotubes, and graphite, graphene more effectively lowers the dehydrogenation temperature and improves the dehydrogenation kinetics of LiAlH4. With 15 wt% graphene incorporation, the initial hydrogen release temperature is ~80 °C (60 °C lower than that of pristine LiAlH4).

Fe nanoparticles (∼10 nm), used to grow carbon nanotubes (CNTs), have an outstanding ability to catalyze the dehydrogenation of LiAlH4 . The CNTs help connect Fe and LiAlH4 and create microchannels among the composite, thus promoting the release of hydrogen. Inspired by these results, a supercritical-CO2 -fluid-assisted deposition technique is employed to decorate the Fe/CNTs with highly dispersed nanosized Ni (∼2 nm in diameter) for better performance. With the incorporation of 10 wt % of this hierarchical catalyst (Ni/Fe/CNTs), the initial dehydrogenation temperature of LiAlH4 is decreased from ∼135 to ∼40 °C. At 100 °C, this catalyzed LiAlH4 takes only ∼0.1 h to release 4.5 wt % hydrogen, which is more than 100 times faster than the time needed with pristine LiAlH4 . The dehydrogenation mechanism of the complex hydride is examined using in situ synchrotron X-ray diffraction.

Objectives: The study is aim at evaluating the effects of GABA tea on colorectal cancer cell proliferation, colony formation and invasion. Methods: Colorectal cancer cell line HT-29 treated with GABA tea extract (12.5~200g/mL) were assessed for viability by MTT assay and for their invasion potential by evaluating their ability to penetrate through a matrix gel-coated Boyden chamber. Results: GABA tea extract exhibited slight effect on cell proliferation of HT-29. The colony formation was inhibited in both culture plate and Boyden chamber. Conclusions: GABA tea extract inhibited the colony formation and invasion of colorectal cancer cells. GABA tea is a potential adjuvant agent for colorectal cancer therapy.