Xueru Liu

Compared with silver nanowires and silver nanospheres, silver nanocubes and silver nanoplates with larger curvature structures like sharp vertices and edges have great potential in optical applications. In general, the controllable joining of silver nanomaterials has become an effective way to change the electrical and optical properties of silver nanomaterials in recent years. However, urgent research on the controllable joining of silver nanocubes or silver nanocubes is still rarely reported. After being thermal treated at 250 °C for 8 min, a good joining among silver nanocubes can be obtained without significant damage to the cubic structure. For laser sintering, with the increase of laser energy input, silver nanocubes gradually transform to spherical particles. Joining among few particles can be observed when silver nanocubes are scanned by 5 W of laser at 1.0 mm s⁻¹. Obvious joining among silver nanocubes can be obtained by thermal treating at 300 °C for 5 min and laser scanning at 7 W at 0.2 mm s⁻¹. Thermal heating is more suitable for forming different degrees of connection between silver nanocubes or between silver nanocubes, while laser treatment is suitable for changing the shape of silver nanocubes or silver nanocubes without obvious connection.

In this work, we constructed the “Biped” Janus Fe₃O₄@[ ]SiO₂@TiO[ ]&[ ]SiO₂ nanoparticles as drug carriers to improve the performance of microwave-controlled releasing drugs. The SEM and TEM characterization confirmed the successful synthesis of the “Biped” Janus nanoparticles. The Fe₃O₄@[ ]SiO₂@TiO[ ] core-shell nanosphere showed stable nanoparticles of consistent and desirable diameter of about 250[ ]nm. The length and the diameter of the rod-shaped [ ]SiO₂ were about 420[ ]nm and 310[ ]nm, respectively. The cumulative loading rate of doxorubicin hydrochloride (DOX) reached 43[ ]wt% after 240[ ]min, equivalent to 100.18[ ]mg g[ ]. It was found that the “Biped” Janus nanoparticles had dual-triggering properties of pH and microwave. At pH 7.0, 5.0 and 3.0, the drug release rate was as high as 55.91[ ]wt%, 73.78[ ]wt% and 77.81[ ]wt% at 210[ ]min, respectively. Under the microwave stimulation of pH 7.0, the drug release rate was significantly increased from 55.91[ ]wt% to 83.86[ ]wt% compared with nonmicrowave irradiation. The “Biped” Janus Fe₃O₄@[ ]SiO₂@TiO[ ]&[ ]SiO₂ have high drug loading and release efficiency, and shown good biocompatibility. Therefore, the biped Janus-shaped nanoparticles have huge potential in targeted therapy.

A star-like CoIII2DyIII2 complex (1) and a cross-shaped Co ^II/III –Dy complex (2) have been obtained, in which 1 exhibits double magnetic relaxation behavior, while 2 only shows slow magnetic relaxation signals.