Perovskite α-CsPbI3 nanocrystals (NCs) with a high fluorescence quantum yield (QY) typically undergo a rapid phase transformation to a low-QY δ-CsPbI3 phase, thus limiting their optoelectronic applications. In this study, organic molecule hexa­methyl­di­sila­thiane (HMS) is used as a unique surfactant to greatly enhance the stability of the cubic phase of CsPbI3 NCs (HMS-CsPbI3) under ambient conditions. The reaction kinetics of the phase transformation of CsPbI3 NCs are systemically investigated through in situ photoluminescence (PL), X-ray diffraction, and transmission electron microscope (TEM) measurements under moisture. The activation energy of HMS-CsPbI3 NCs is found to be 14 times larger than that of CsPbI3 NCs capped by olyelamine (OLA-CsPbI3 NCs). According to density functional theory calculations, the bonding between HMS and CsPbI3 NCs is stronger than that between OLA and CsPbI3 NCs, preventing the subsequent phase transformation. Our study presents a clear pathway for achieving highly stable CsPbI3 NCs for future applications.

ANV-6L15 promoted survival of ischemic rat cremaster muscle and abdominal fasciocutaneous flaps and ameliorated leukocyte-related IRI. Future evaluation of potential clinical application of ANV-6L15 is warranted as a flap treatment adjunct.

Nano-hydroxyapatite (n-HAP) surface-grafting poly(L-lactide) (g-HAP) was synthesized by ring-opening polymerization ofL-lactide (L-LA) using stannous octoate as initiator andn-HAP as co-initiator under microwave irradiation. An optimal reaction condition was obtained as follows: temperature of 140 °C, irradiation time of 45 min and microwave power of 50 W. The products were characterized by FTIR, TGA, x-ray scattering and particle size analysis. Results showed that the feeding ratio ofnn-HAP：nL-LAhad a significant influence on the grafting percentage ofg-HAP. With increasing thenn-HAP:nL-LAfeeding ratio from 1:50 to 1:400, the grafting percentage ofg-HAP increased correspondingly from 14.91% to 35.88%. Theg-HAP particles showed a smaller size than that of pristinen-HAP, suggesting that the grafted poly(L-lactide) segment facilitated to prevent theg-HAP particles from aggregating.

nanocomposites of poly (L-lactide) (PLLA) and hydroxyapatite (HAP) or surface grafted hydroxyapatite (g-HAP) were prepared by ultrafines hot-pressing method, and the properties were investigated by polarized optical microscopy (POM), scanning electron microscopy (SEM), mechanical test and cell culture. Results showed that the PLLA segment grafted onto the HAP surface played a positive role on improving the interfacial compatibility between the g-HAP and the PLLA matrix. Compared with the HAP/PLLA composites, the bending strength and bending modulus of the g-HAP/PLLA composites were obviously enhanced, which was proportional to the nHAP:nL-LA ratio. The result of POM showed that the g-HAP particles acted as an effective heterogeneous nucleating agent in the g-HAP/PLLA composite. Fibroblasts culture indicated that the g-HAP/PLLA composites had better cytocompatibility than PLLA and HAP/PLLA composites. Hence, g-HAP/PLLA composites will be a promising material for bone tissue engineering.