No abstract

Chemoselective C−H arylations were accomplished through micellar catalysis by a versatile single‐component ruthenium catalyst. The strategy provided expedient access to C−H‐arylated ferrocenes with wide functional‐group tolerance and ample scope through weak chelation assistance. The sustainability of the C−H arylation was demonstrated by outstanding atom‐economy and recycling studies. Detailed computational studies provided support for a facile C−H activation through thioketone assistance.

The hierarchical self-assembly of distinct nanoelements into precisely ordered nanostructures requires efficient and flexible fabrication strategies. Herein, we report the precise fabrication of bimetallic gold-planet–silver-satellite nanoparticle-arrangements employing RAFT star polymers as particle linker connecting gold nanoparticles (AuNPs) and silver nanoparticles (AgNPs) with judiciously modified surface activity. The strengths of this approach include the adjustability of interparticle distances by tailoring the star polymer molar mass. The prepared nanoassemblies have well-defined structures in which a planet AuNP (∼13 nm) is encompassed by several satellite AgNPs (∼8 nm), thus incorporating the properties of both AuNPs and AgNPs, as confirmed by transmission electron microscopy and UV–vis spectra. Our results highlight the general applicability of RAFT star polymers as a nanosynthesis platform for synthesizing noble metal nanocomposites.

Hydrophilic surfaces for hydrogels as bone tissue engineering scaffolds are not beneficial for the adsorption of protein and not conducive to the adhesion and growth of cells. In this study, we proposed to use an oxidized sodium alginate-N-succinyl chitosan hydrogel as a bone tissue engineering scaffold material and to overcome this issue by using RGD to modify this kind of hydrogel. The physicochemical properties of the obtained hydrogels were characterized and an in vitro endothelial differentiation and osteogenic differentiation study of bone-marrow-derived mesenchymal stem cells (BMSCs) was conducted to evaluate it. The results showed that the RGD-grafted oxidized sodium alginate-N-succinyl chitosan hydrogel not only had a good degradability but also enhanced cell adhesion and proliferation and promoted endothelial differentiation and osteogenic differentiation of BMSCs. Based on the results, it can be expected that RGD-grafted oxidized sodium alginate-N-succinyl chitosan hydrogel might be an optimal material for bone tissue engineering scaffold whenever it is used alone, or composed with other materials in the future. Preparation of oxidized sodium alginate (OSA)Sodium alginate (5.0 g) was added to distilled water (250 mL) and stirred until it dissolved completely to form a 2% (w/v) solution. Then it was mixed with weighed sodium periodate

No abstract

No abstract

No abstract

We consider the fully parity-time (PT) symmetric nonlocal (2 + 1)-dimensional nonlinear Schrödinger (NLS) equation with respect to x and y. By using Hirota's bilinear method, we derive the N-soliton solutions of the nonlocal NLS equation. By using the resulting N-soliton solutions and employing long wave limit method, we derive its nonsingular rational solutions and semi-rational solutions. The rational solutions act as the line rogue waves. The semi-rational solutions mean different types of combinations in rogue waves, breathers, and periodic line waves. Furthermore, in order to easily understand the dynamic behaviors of the nonlocal NLS equation, we display some graphics to analyze the characteristics of these solutions. KEYWORDSrational wave, semi-rational wave, soliton wave, the nonlocal (2 + 1)-dimensional NLS equation MSC CLASSIFICATION 35C08; 35Q51; 35Q55Math Meth Appl Sci. 2019;42:6865-6877.wileyonlinelibrary.com/journal/mma