In this report, a facile system consisting of iron (III) meso-tetrakis(4-hydroxyphenyl)porphyrin-methylene blue dye hybrid immobilized on a disposable paper strip was used to detect and sense H2O2 in aqueous solutions via a low-cost pixelometric imaging technique. The new technology was employed to evaluate the level of H2O2 in a self-administering 30%-labeled commercial H2O2 disinfectant solution. The result showed that the concentration of H2O2 in the tested pharmaceutical sample solution deviated from the label by 92.37%. The current approach provides a simple low-cost resolution for the rapid detection and quantification of H2O2 in aqueous solution and pharmaceutical fluids.

Deformation twinning has been frequently observed in body-centered cubic (BCC) high entropy alloys (HEAs), however, the underlying mechanism remains elusive. We perform molecular dynamics simulations on a representative BCC HEA nanopillar under high-symmetry compression, describe atomic details of deformation twinning, and propose a mechanism of twin nucleation from the surface. We find that twinned regions are formed by partial dislocations and that chemical heterogeneity can reduce local fault energy and promote stacking faults and twins. These results help to understand the propensity for stacking fault formation and twinning in HEAs and may guide the design of novel HEAs through control of active twinning mechanisms.

Multifunctional scaffolds with dual release of small molecular drugs and biomacromolecules have potential in many applications such as cancer postoperative care, which require appropriate administration of anticancer drugs and biomacromolecules in a spatiotemporal manner. Herein, a systematic investigation into the dual release of anticancer drugs and biomacromolecules from the bicomponent nanofibrous scaffolds is performed. Their release behavior is affected by different fabrication techniques and different polymers used. We show that the bicomponent scaffold fabricated by dual-source dual-power emulsion electrospinning enables dual release of anticancer drugs and biomacromolecules in a controlled manner, holding promise for combinational cancer postoperative care.