Nanoporous Co-doped Zn1−xCdxS were facilely fabricated via adopting ZIFs as templates, and Cd(NO3)2 and thiourea as precursors. The highly porous microstructure and uniform Co-doping of the photocatalyst afford a high H2-production rate (45.2 and 422.2 times larger than those of Zn0.5Cd0.5S and CdS), providing an effective way for the development of high performance nanoporous photocatalysts.

Inorganic coating was fabricated on the surface of the porous Si3N4 ceramic by polymer derived (PD) and spraying technology, via using vinyl-polysilazane (PSN-1) as a preceramic polymer and Si3N4 and lithium aluminosilicate (LAS) powders as fillers. The phase and microstructure of the coatings were analyzed by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM), respectively. The effect of the coatings on mechanical property and humidity resistance of the porous Si3N4 ceramic was investigated. The experimental results showed that we successfully fabricated the uniform and dense coating which preferably combined with the substrate upon the addition of fillers. The bending strength of the porous Si3N4 ceramic sprayed the coating increased by more than 18%, and the surface hardness increased by 1.7 times. The apparent porosity of the materials reduced by an average of 97.7%, and water absorption was below 0.5%. Therefore, the prepared coating with preferable density had an obviously moisture-proof and enhanced effect on the porous Si3N4 ceramic.

•Fe3O4 nanoparticles were modified with carboxymethyl-β-cyclodextrin.•The grafting of CM-β-CD onto Fe3O4 nanoparticles enhanced the drug loading capacity.•The nanocarrier displayed excellent loading efficiency and magnetic property.•The drug release from the nanocarriers was diffusion and swelling controlled.•The drug release profile fits well with the Korsmeyer–Peppas model.In this study, a novel hydrogel, chitosan (CS) crosslinked carboxymethyl-β-cyclodextrin (CM-β-CD) polymer modified Fe3O4 magnetic nanoparticles was synthesized for delivering hydrophobic anticancer drug 5-fluorouracil (CS-CDpoly-MNPs). Carboxymethyl-β-cyclodextrin being grafted on the Fe3O4 nanoparticles (CDpoly-MNPs) contributed to an enhancement of adsorption capacities because of the inclusion abilities of its hydrophobic cavity with insoluble anticancer drugs through host–guest interactions. Experimental results indicated that the amounts of crosslinking agent and bonding times played a crucial role in determining morphology features of the hybrid nanocarriers. The nanocarriers exhibited a high loading efficiency (44.7 ± 1.8%) with a high saturation magnetization of 43.8 emu/g. UV–Vis spectroscopy results showed that anticancer drug 5-fluorouracil (5-Fu) could be successfully included into the cavities of the covalently linked CDpoly-MNPs. Moreover, the free carboxymethyl groups could enhance the bonding interactions between the covalently linked CDpoly-MNPs and anticancer drugs. In vitro release studies revealed that the release behaviors of CS-CDpoly-MNPs carriers were pH dependent and demonstrated a swelling and diffusion controlled release. A lower pH value led to swelling effect and electrostatic repulsion contributing to the protonation amine impact of NH3+, and thus resulted in a higher release rate of 5-Fu. The mechanism of 5-Fu encapsulated into the magnetic chitosan nanoparticles was tentatively proposed.A novel nanocarrier, chitosan-coated magnetic drug carrier nanoparticle (CS-CDpoly-MNPs) is fabricated for the delivery of insoluble anticancer drug by grafting CM-β-CD onto the magnetite surface. The grafting of CM-dextrins onto the surface of Fe3O4 nanocrystal clusters can markedly increase the loading capacity of 5-Fu by virtue of CM-dextrins/5-Fu inclusion complex formation. The release of 5-Fu from nanocomposite carriers is pH dependent and displays different release efficiencies in various release media solutions.

Oriented magnetite (Fe3O4) nanorods have been successfully synthesized using a simple ethylenediamine-assisted hydrothermal technique. The samples were characterized by X-ray diffractometer, transmission electron microscopy, Fourier transform infrared and vibrating sample magnetometer. The cubic spinel structure Fe3O4 nanorods show a good crystalline state and the diameter is ~5 nm with lengths up to 0.5 μm. Experimental results indicate that ethylenediamine plays a crucial role in determining morphological features. The Fe3O4 nanorods exhibit ferromagnetic behavior at room temperature with a magnetic saturation value of 72.94 emu g−1. The growth mechanism based on the results of control experiments is also discussed.

Fe3O4@SiO2@ZnSe composite nanoparticles with superparamagnetism and luminescence have been prepared by a facile chemical method. Nontoxic fluorescent ZnSe quantum dots were assembled around the Fe3O4-silica core–shell nanocomposite via chemical bonds formed between –COOH and –NH2. Transmission electron microscopy images show that the nanocomposites are approximately spherical and between 50 nm and 80 nm in size. The bifunctional nanocomposites exhibit superparamagnetic behavior and good fluorescence intensity. Magnetic attraction test, vibrating sample magnetometer at 300 K, UV–visible absorption and fluorescence emission spectroscopy were applied to characterize the magnetic/fluorescent properties of the nanocomposites.

Silica encapsulated ZnSe/ZnS quantum dots (QDs) are prepared via a sol–gel method by hydrolyzing tetraethyl orthosilicate (TEOS) on the surface of the QDs. The photoluminescence (PL) intensity of ZnS coated ZnSe QDs is more than three times that of ZnSe QDs. By partial interchange of the capping ligand from thioglycolic acid (TGA) to 3-mercaptopropyltri-methoxysilane (MPS) on the QDs, initial PL efficiency of the QDs in water was retained. The average size and morphology of the multicore-shell structured ZnSe/ZnS@SiO2 can be controlled by varying MPS and TEOS concentration.

Core–shell structured Fe3O4/SiO2 nanoparticles (NPs) sized 40–50 nm with a narrow size distribution have been synthesized by a mechanical stirring and ultrasonication assisted Stöber method at the room temperature. It is shown that the combination of the ultrasonication and mechanical stirring during the preparation process benefits the formation of the well-dispersed NPs. The Fe3O4/SiO2 core–shell microstructure is identified with X-ray diffraction and transmission electron microscopy measurements and such NPs exhibit superparamagnetism.

In this paper, monodisperse 6 nm-sized Fe3O4 nanoparticles with spinel crystalline structure were synthesized via a co-precipitation method. The effect of HCl concentrations on Fe3O4 samples was investigated by TEM, VSM and UV–vis. HCl-modified Fe3O4 nanoparticles solution was a stable, clear, transparent cationic colloid. The results showed that HCl had a great influence on the dispersity of Fe3O4 nanoparticles and almost no influence on the materials magnetism.