A class of permutation quadrinomials

In this paper, we investigate the permutation behavior of a class of quadrinomials. Each term of these quadrinomials has a Niho-type exponent, and two sets of coefficient triples making the quadrinomials to be permutations are obtained. We use a substitution to transform the permutation problem into the root distribution problem in the unit circle of certain quadratic and cubic equations.     

A Bifunctional Luminescent Metal–Organic Framework for the Sensing of Paraquat and Fe3+ Ions in Water

The hydrothermal reaction of Zn²⁺ ions with a mixture of two ligands, Hcptpy and H₃btc (Hcptpy=4‐(4‐carboxyphenyl)‐2,2′:4′,4′′‐terpyridine; H₃btc=1,3,5‐benzenetricarboxylic acid), led to the formation of a 3D metal–organic framework (MOF) with 1D channels, [Zn₂(cptpy)(btc)(H₂O)]_n ( 1 ), which was structurally characterized by using single‐crystal X‐ray diffraction (SXRD). In MOF 1 , two independent Zn²⁺ ions were interconnected by btc^3? ligands to form a 1D chain, whilst adjacent Zn²⁺ ions were alternately bridged by cptpy^? ligands to generate a 2D sheet, which was further linked by 1D chains to form a 3D framework with a new (3,3,4,4)‐connected topology. Furthermore, compound 1 also exhibited excellent stability towards air and water and, more importantly, luminescence experiments indicated that it could serve as a probe for the sensitive detection of paraquat (PAQ) and Fe³⁺ ions in aqueous solution.     

High-selectively determination of nitric oxide on nanoporous gold electrode

Journal of Solid State Electrochemistry - Here, a nanoporous gold electrode (NAu) was reported with a unique cone-shape nanohole structure for electrochemical sensing of nitric oxide (NO), which...     

Positively Charged Nanoaggregates Based on Zwitterionic Pillar[5]arene that Combat Planktonic Bacteria and Disrupt Biofilms

Bacterial biofilms are difficult to eradicate because they are less susceptible to antibiotics and more easily develop resistance. Therefore, there is an urgent need for new materials that can combat planktonic bacteria and disrupt established biofilms. To tackle this challenge, we design a multifunctional zwitterionic pillar[5]arene, which can self‐assemble into weakly positively charged nanoaggregates that exhibit antibacterial activity against Gram‐negative Escherichia coli (DH5α) and Gram‐positive Staphylococcus aureus (SH1000) bacterial strains in solution. In addition, the zwitterionic pillar[5]arene can efficiently disrupt pre‐existing Escherichia coli (DH5α) biofilms and kill the biofilm‐enclosed bacteria without rapid generation of resistance.     

Quantum chemical investigation of the detection properties of alternariol and alternariol monomethyl ether

Structural Chemistry - Alternariol and alternariol monomethyl ether are mycotoxins occasionally found in food and beverages that have been contaminated by certain fungi of the Alternaria genus....     

Absorption Enhancement of Ultrathin Crystalline Silicon Solar Cells with Dielectric Si_3N_4 Nanostructures

A design of ultrathin crystalline silicon solar cell with Si3 N4 circular truncated cone holes(CTCs) arrays on the top is proposed. In this article, we perform an optical simulation of the structure. The finite-difference time-domain method is used to calculate the optical absorption of different periods, radius of top and bottom circles and depth of Si3 N4 CTCs. The short-circuit current density generated by the optimized cells(30.17 mA/cm~2) is 32.44% more than the value gained by control group(with flat Si3 N4). Then adding a layer of back silver to allow us to better analyze optical absorption. Later, we simulate the optimization of the same configuration of different silicon thicknesses andfind that our structure does enhance the light absorption. This work uses a combined path towards achieving higher photocurrent ultrathin crystalline silicon solar cells by constructing the texture of anti-reflection coating.     

Heinz type inequalities for mappings satisfying Poisson’s equation

In this paper, we study the Heinz type inequalities for mappings satisfying Poisson’s equation. Some results generalize the ones obtained by Partyka and Sakan.     

The Application of Micro‐ and Nanomotors in Classified Drug Delivery

Micro and nanomotors (MNMs) are micro/nanoscale devices that are able to convert chemical or external energy into mechanical motion. Based on a multitude of propulsion mechanisms, synthetic MNMs have been developed over the past decades for diverse biomedical applications, particularly drug delivery. Herein, we set out the classification of drugs delivered by MNMs, such as small molecules, nucleic acid, peptides, antibodies, and other proteins, and discuss their current limitations and possibilities in in vivo applications. Challenges and future perspectives are also discussed. With the increasing research enthusiasm in this field and the strengthening of multidisciplinary cooperation, intelligent MNMs will appear in the near future, which will have a profound impact on all related fields.