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High-resolution electron microscopy requires electron beams with high-brightness. Hence, the authors used a resist-assisted patterning process to fabricate a new high-resolution cold-cathode electron beam with carbon nanotube (CNT) electron emitters. Herein, the authors successfully prepared one free-standing CNT emitter containing no impurities. The authors calculated the electron beam properties of the CNT emitter and found a reduced brightness of 1.7 × 107 A m−2 sr−1 V−1 at a current of 1.5 μA with a spatial resolution of 50 μm in a diode configuration. The one free-standing CNT emitter cold-cathode electron beam could be applied to a variety of electron microscope devices.

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A novel one-pot asymmetric synthetic method for the direct conversion of bromoacetates into highly substituted hydantoins has been developed. Both enantiomers of 1,3,5-trisubstituted hydantoins were conveniently synthesized through a dynamic kinetic resolution of bromoacetates derived from either ethyl l-lactate or diacetone-d-glucose. The sequential three-component reaction permitted the preparation of (R)- or (S)-1,3,5-trisubstituted hydantoins in yields of 77–51% with enantiomeric ratios of up to 95:5.

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