Synergistic Enhancement Mechanisms of Lithium-Ion Storage in Black Phosphorus@TiCT (BP@TiCT) Composite Thin-Film Electrodes.

A binder-free BP@TiCT composite thin-film electrode was fabricated via a one-step vacuum filtration method, enabling precise control over morphology and scalability. The TiCT MXene framework constructs a 3D conductive network that enhances charge transfer kinetics and mechanically confines black phosphorus (BP) particles through robust Ti─O─P bonding, effectively suppressing BP's volume expansion during cycling. Structural characterization (XRD, SEM, EDS, etc.

Preparation of topoisomers of short circular dsDNA with defined linking number by accurate topological control.

Short DNA catenanes [circular double-stranded DNA (dsDNA)] have attracted considerable interest for constructing nanostructures and nanomachines, as well as understanding DNA topology. The study of topoisomers of a circular dsDNA with a definite linking number (Lk) is essential but very difficult for simplifying the complex problems about DNA topology. The topoisomers are difficult to prepare, especially in the case that two strands are completely complementary.

Z-DNA Formation in the Hybrid between Two Circular ssDNAs Involving Hairpin Structures.

Z-DNA, a left-handed DNA conformation, plays critical roles in transcriptional regulation, genetic recombination, genomic instability, immunity, and human diseases. In 2019, a stable LR-chimera containing Z-DNA (Lk = 0) under physiological ionic conditions was prepared by hybridizing two complementary circular ssDNAs. However, the difficulty in preparing circular ssDNA precursors and the excessively long Z-DNA segment in the chimera limit its applications.