Carbon Nanomaterials for Biological Imaging and Nanomedicinal Therapy

Colloidal nanocrystals (NCs, i.e., crystalline nanoparticles) have become an important class of materials with great potential for applications ranging from medicine to electronic and optoelectronic devices. Today’s strong research focus on NCs has been prompted by the tremendous progress in their synthesis. Impressively narrow size distributions of just a few percent, rational shape-engineering, compositional modulation, electronic doping, and tailored surface chemistries are now feasible for a broad range of inorganic compounds. The performance of inorganic NC-based photovoltaic and light-emitting devices has become competitive to other state-of-the-art materials. Semiconductor NCs hold unique promise for near- and mid-infrared technologies, where very few semiconductor materials are available. On a purely fundamental side, new insights into NC growth, chemical transformations, and self-organization can be gained from rapidly progressing in situ characterization and direct imaging techniques. New phenom...

Prospects of Nanoscience with Nanocrystals

Lanthanide Nanoparticles: From Design toward Bioimaging and Therapy

This review captures the synthesis, assembly, properties, and applications of copper chalcogenide NCs, which have achieved significant research interest in the last decade due to their compositional and structural versatility. The outstanding functional properties of these materials stems from the relationship between their band structure and defect concentration, including charge carrier concentration and electronic conductivity character, which consequently affects their optoelectronic, optical, and plasmonic properties. This, combined with several metastable crystal phases and stoichiometries and the low energy of formation of defects, makes the reproducible synthesis of these materials, with tunable parameters, remarkable. Further to this, the review captures the progress of the hierarchical assembly of these NCs, which bridges the link between their discrete and collective properties. Their ubiquitous application set has cross-cut energy conversion (photovoltaics, photocatalysis, thermoelectrics), en...

Compound Copper Chalcogenide Nanocrystals

Graphene oxide: A promising nanomaterial for energy and environmental applications

Highly fluorescent cysteine-capped CdTe/CdS core–shell nanowires were successfully synthesized by reacting CdCl2 with NaHTe in aqueous solution under refluxing at 100 °C for 140 min. On increasing the reaction time from 10 to 140 min, CdTe/CdS nanocrystals gradually grew into nanorods and eventually completely evolved into nanowires. The nanowires have amino and carboxyl functional groups on their surfaces and can be well dispersed in aqueous solution. The as-prepared CdTe/CdS nanowires show a fluorescence quantum yield (QY) of 7.25 % due to the unique nature of cysteine and the formation of a CdS shell on the surface of the CdTe core, they have a narrower diameter distribution (d = ~5 nm) and a length in the range of 175–275 nm, and their aspect ratio is between 1/35 and 1/55.

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One-pot aqueous synthesis of cysteine-capped CdTe/CdS core-shell nanowires

Collagen-polyacrylamide (Collagen-PAm) semi-interpenetrating network composite hydrogels were prepared by in-situ free radical polymerization. This collagen - polyacrylamide hydrogel has good tensile and compression repair properties, collagen can improve the mechanical properties of PAm. Composite hydrogels have regular pore structure. Collagen/polyacrylamide (g/g) ratio of 6.0:100 hydrogel pore size range 75–95 µm, conducive to cell migration and growth. The study of swelling kinetics showed that the water diffusion in hydrogel was Fick diffusion, which was beneficial to the fixation of cells and drugs. The pH sensitivity study showed that complex hydrogels have good environmental stability under acidic, neutral and weakly alkaline conditions. The addition of collagen can improve the thermal stability of the composite hydrogel because of the strong hydrogen bond between collagen and polyacrylamide in the semi-interpenetrating network. DMA results show that the E ' of Collagen-PAm is 6 ~ 8KPa, E 'of Collagen-PAm is 12 ~ 35KPa, which is 2–4 times higher than PAm, and the deformation reversibility and formability are good. Therefore, as a new tissue engineering material, collagen-polyacrylamide composite hydrogel has a good application prospect. 

Synthesis and characterisation of high resilience collagen- polyacrylamide semi-interpenetrating network hydrogel

The effect of novel antimicrobial peptides (AMPs) and antimicrobial peptide microspheres (AMS) on the physicochemical and microbial quality of Tricholoma matsutake wild edible mushrooms was investigated. In the experiments, 1.0 g/L, 0.5 g/L of AMS, and 1.0 g/L AMPs were used as preservatives. Mushrooms coated with 1.0 g/L and 0.5 g/L of AMS as a preservative had better physicochemical and sensory qualities than did mushrooms coated with 1.0 g/L of AMPs. In the experiment, 1.0 g/L of blank microspheres without cathelicidin-BF-30 (PLGA-1.0) and distilled water was used as the control. Samples with these two treatments had minimal changes in texture, weight loss, total bacteria count, and sensory attributes. Research results suggests that the use of AMS can maintain the quality of Tricholoma matsutake wild edible mushrooms and could extend the postharvest life to 20 d.

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Effect of Antibacterial Peptide Microsphere Coating on the Microbial and Physicochemical Characteristics of Tricholoma matsutake during Cold Storage

The invention relates to a simple, effective preparation method of CdTe/CdS core-shell structured nanowires. The preparation method is characterized in that cadmium chloride (CdCl2) is taken as the source of Cd, while sodium hydrotelluride (NaHTe) is taken as the source of Te, and aminothiopropionic acid is taken as a stabilizer and a modifier for the nanowires so that the nanowires are enabled to have double functional groups (amino and carboxyl). The CdTe/CdS core-shell structured nanowires prepared by the method are expected to have great potential application value in the fields such as biosensors, cell imaging and drug carriers.

Preparation method of cadmium telluride/cadmium sulfide core-shell structured nanowires

Drug-loaded microspheres are an ideal bone tissue delivery material. In this study, a biodegradable Schiff base chitosan–polylactide was used as the encapsulation material to prepare drug-loaded microspheres as biocompatible carriers for controlled vancomycin release. In this regard, Schiff base chitosan was prepared by the Schiff base method, and then different proportions of the Schiff base chitosan–polylactide polymer were prepared by ring-opening polymerization. Drug-loaded microspheres were prepared by the W/O emulsion method, and the polymers and polymer microspheres were characterized and studied by NMR, IR, and antibacterial methods. The drug loading and release rates of microspheres were determined to investigate the drug loading, encapsulation efficiency, and release rate of drug microspheres at different ratios. In this study, different proportions of Schiff base chitosan–polylactic acid materials are successfully prepared, and vancomycin-loaded microspheres are successfully prepared using them as carriers. This study proves that the materials have antibacterial activities against Staphylococcus aureus and Escherichia coli. The particle size of drug-loaded microspheres was below 10 μm, and the particle size decreased with decreasing molecular weight. The obtained results show that 1:100 microspheres have the highest drug-loading and encapsulation efficiencies, the drug-loaded microspheres have no burst release within 24 h, and the release quantity reaches more than 20%. After 30 days of release, the release amounts of 1:10, 1:20, 1:40, 1:60, and 1:100 drug-loaded microspheres were 64.80 ± 0.29%, 54.43 ± 0.54%, 44.60 ± 0.43%, 42.53 ± 0.40% and 69.73 ± 0.45%, respectively, and the release amount of 1:100 was the highest.

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Hongli Li

Papers

One-pot aqueous synthesis of cysteine-capped CdTe/CdS core-shell nanowires

Synthesis and characterisation of high resilience collagen- polyacrylamide semi-interpenetrating network hydrogel

Effect of Antibacterial Peptide Microsphere Coating on the Microbial and Physicochemical Characteristics of Tricholoma matsutake during Cold Storage

Preparation method of cadmium telluride/cadmium sulfide core-shell structured nanowires

The Preparation and Characterization of Chitooligosaccharide–Polylactide Polymers, and In Vitro Release of Microspheres Loaded with Vancomycin