Hierarchically porous materials that can be used as catalysts or catalyst supports have garnered much attention due to their enhanced mass transport and multiple functionalities. Hierarchically porous catalysts integr...
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In recent years, self-assembly nanoparticles into well-ordered structures possess quite important position in spectroscopy, magnetism, catalysis and biology. Among all of the nanoparticles, magnetic nanoparticles prom...
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In recent years, self-assembly nanoparticles into well-ordered structures possess quite important position in spectroscopy, magnetism, catalysis and biology. Among all of the nanoparticles, magnetic nanoparticles promises an unparalleled opportunity for self-assembly as they can be controlled to form directional arrangements according to the external magnetic fields. Herein we choose Cobalt nanoparticles whose diameter is within 10 nm. In this size they can show fabulous superparamagnetism, which means each nanoparticle is a small domain, when without an external field, the particles are disordered and show paramagnetic. However, when an external field is applied, to which the nanoparticles are controlled to arrange, and at this time they show ferromagnetic. What can’t be ignored is that it is difficult to achieve self-assembly process in smaller size of the nanoparticles due to easy aggregation. Taking this into consideration, core-shell nanostructures provide an effective vehicle to protect magnetic core and enhance their chemical stability. In this work, ordered self- assembly Co@SiO 2 nanocomposites are firstly reported by changing the external magnetic field. Cobalt nanoparticles as the magnetic cores were easily controlled to form varies arrangements, which means they can self- assembly into multi-scale regular patterned structures. Owing to strong external magnetic field, the ordered structured crystalline Co@SiO 2 composite with directional arrangements are successfully achieved by self-assembly. Moreover, by changing the magnetic field, the composite also forms 2D arrays and 3D structures. This nanocomposite can be applied as controlled targeted drug carriers which shows great potential in biological diagnosis and biomedical treatment. It is believed that this methodology of self-assembly can be extended to other similar core-shell nanocomposites with magnetic core and paves way to further applications in magnetism and biomedical researches.
Biomineralization is a widespread phenomenon in nature leading to the formation of a variety of solid inorganic structures by living organisms. And many chemists have long strived to mimic this nature’s critical tric...
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Biomineralization is a widespread phenomenon in nature leading to the formation of a variety of solid inorganic structures by living organisms. And many chemists have long strived to mimic this nature’s critical tricks. Many studies have been focused on this field. These biomineralized materials are inorganic-organic hybrid composites formed by self-assembled processes under mild conditions, showing interesting properties, controlled hierarchical structures, and special function. Among the biomineralization, proteins are attractive for synthesis of the hybrid materials, due to its much milder reaction conditions, highly specific or multiple functions and many successful examples existing in nature. Here we chose a functional protein, C96 RIDC-1 4 , which has the ability to selectively bind metal irons, such as Zn 2+ . Because of its high surface area, high stability and the property of capillary effect, the hierarchically structured porous materials are one of the ideal materials for biomineralization. In the typical synthesis process of the macro-meso porous materials, the functional protein was used as the second kind of the templates to induce the formation of the hierarchically structured porous materials, besides the surfactant is a template. For the living of the protein, we change the reaction condition to be much milder, such as at or near neutral pH, choosing the special surfactant which is not harmful to the protein, and so on. We prepared the macro-meso porous materials into the monolithic column. And this monolithic column is porous structure with macropores and two sizes of the mesopores. With the obtained monolithic devices, we tested its adsorption amount of Zn 2+ to get the limit value, the efficiency of the adsorption using the Zn 2+ solution with very low concentration and different filter time. Those results show the potential application in purifying the water to obtain the pure water with less impurity ions, purifying the organic compound and dr
The effects of a room temperature ionic liquid, 1-butyl-3-methylimidazolium terafluoroborate ([Bmim]BF4), on the photocatalytic performance of Degussa P25 TiO2 were investigated. Also, the photocatalysis mechanism was...
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Raw ginger was introduced to a series of composite antioxidants. The specimens performed better efficiency than ordinary antioxidants while extracting vitamin C from strawberry. The results suggested that, by employin...
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Raw ginger was introduced to a series of composite antioxidants. The specimens performed better efficiency than ordinary antioxidants while extracting vitamin C from strawberry. The results suggested that, by employing raw ginger composite antioxidant, the reservation of vitamin C could be 91.63% in washing process and 76.68% in squeezing process respectively. Furthermore, in squeezing process, the reservation of vitamin C reached 84.78% while the concentrate of raw ginger antioxidant was 0.03%. The both deposits performed perfect synergy effectively. Raw ginger composite antioxidant could be the well agent to extract vitamin C from fruit.
The potential use of simultaneous thermal technology has been explored for quantifying mixed calcium oxalate monohydrate and dihydrate, which are major mineral components of urinary stones. Based on the observation an...
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Mesoporous V 2 O 5 @TiO 2 composites were fabricated by an ultrasonic method with V 2 O 5 sol as the guest precursor. The prepared materials were characterized by powder X-ray diffraction, field emission-scanning elec...
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Mesoporous V 2 O 5 @TiO 2 composites were fabricated by an ultrasonic method with V 2 O 5 sol as the guest precursor. The prepared materials were characterized by powder X-ray diffraction, field emission-scanning electron microscopy, transmission electron microscope, X-ray photoelectron spectroscopy, UV-Vis spectroscopy and nitrogen sorption analysis. The results indicated that V 2 O 5 nanoparticles dispersed well on/into the porous structure of TiO 2 matrix. The composites presented typical IUPAC IV isotherms with type H 2 hysteresis loops, revealing the mesoporous structure. It was observed that V 2 O 5 loading led to red shift of the absorption edge to 540 nm and reduced the band gap < 3.0 eV. The V 2 O 5 @TiO 2 composites with V/Ti molar ratio of 0.1 exhibited outstanding degradation efficiency of gaseous benzene.
In recent years, self-assembly nanoparticles into well-ordered structures possess quite important position in spectroscopy, magnetism, catalysis and *** all of the nanoparticles, magnetic nanoparticles promises an unp...
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In recent years, self-assembly nanoparticles into well-ordered structures possess quite important position in spectroscopy, magnetism, catalysis and *** all of the nanoparticles, magnetic nanoparticles promises an unparalleled opportunity for self-assembly as they can be controlled to form directional arrangements according to the external magnetic fields.
We propose a metamaterial based perfect absorber in the visible region, and investigate the performance of titanium nitride as an alternative plasmonic material. Numerical and experimental results reveal that titanium...
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