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Two kinds of core–shell composite particles, i.e., mesoporous-SiO2@Cu (m-SiO2@Cu) and mesoporous-SiO2@TiO2@Cu (m-SiO2@TiO2@Cu) microspheres, were synthesized by coating Cu nanoparticles on the surfaces of m-SiO2 and m-SiO2@TiO2 microspheres. Results show that the m-SiO2 spheres have rougher surfaces and larger specific surface areas than the SiO2 m...
Citations
... Microspheres, also known as microbeads or microparticles, are small spherical particles with diameter ranging from submicron to several millimeters [8], and display a wide range of applications in fields, such as drug delivery [9], tissue engineering [10], catalyst [11] and adsorption [12]. However, preparation of microspheres often confronts with challenges like low yield, complex post-treatment processes to remove residual reagents, and generation of hazardous by-products [13,14]. ...
Microsphere polymer material finds a wide range of applications in fields such as adsorbent, drug carrier, catalyst and coating, and receives continuous attention. We here report a novel strategy of quick synthesis of polymethacrylate microsphere via photoinitiated polymerization of methacrylate monomer in a high internal phase emulsion (HIPE). A low cost and environmentally friendly natural product of β-cyclodextrin (β-CD) has been directly used as Pickering emulsifier to stabilize the methacrylate monomer in water to prepare the HIPE. The factors to control the particle size such as the dosage of β-CD, volume fraction of monomer internal phase and amount of inert diluting solvent, have been investigated in detail. Meanwhile, the approach has been validated by using various methacrylate monomers. Our results indicate that using a diluting solvent can not only change the surface morphology but also control the inner microstructure of the microsphere. By using a poor solvent of cyclohexane as diluting agent, porous microsphere other than solid microsphere has been prepared, and it could be directly applied as adsorbent to decolor oil. Moreover, the obtained poly(glycidyl methacrylate) microsphere was post-modified to exhibit satisfactory adsorption efficiencies towards organic dye contaminates in water. Those results indicate powerful platform of the obtained microsphere with reactive groups for further modification to prepare functional materials for desired purposes. Based on the fast synthesis, high yield, low energy cost as well as no harmful waste, the preparation strategy reported in this work could be scalable, and the obtained microsphere may find promising potential applications.
Graphical abstract
... It has a variable bandwidth, small particle size, large specific surface area and large volume voids, and can adsorb more molecules of the sensing medium. Therefore, it is often used as a composite material to improve the reactants' reaction efficiency, stability and adsorption capacity [32,33]. The above sensor discusses the influence of the form of the sensitizing material Au on the performance of the SPR sensor. ...
In this paper, three different structures of surface plasmon resonance (SPR) sensors based on the Kretschmann configuration: Au/SiO2 thin film structure, Au/SiO2 nanospheres and Au/SiO2 nanorods are designed by adding three different forms of SiO2 materials behind the gold film of conventional Au-based SPR sensors. The effects of SiO2 shapes on the SPR sensor are investigated through modeling and simulation with the refractive index of the media to be measured ranging from 1.330 to 1.365. The results show that the sensitivity of Au/SiO2 nanospheres could be as high as 2875.4 nm/RIU, which is 25.96% higher than that of the sensor with a gold array. More interestingly, the increase in sensor sensitivity is attributed to the change in SiO2 material morphology. Therefore, this paper mainly explores the influence of the shape of the sensor-sensitizing material on the performance of the sensor.
The present research aims to achieve a shape-stable, and leakage-proof material for thermal energy storage (TES). The leakage analysis of 20 wt.% SiO2@Cu PCM shows 0.05%, as a result, more testing is conducted to assess its morphology, structure, and thermal properties. TGA and DSC studies demonstrated that the latent heat and thermal degradation rate (TDR) has been delayed, with a significant decrease in latent heat of roughly 8.7% compared to pure paraffin. Laser Flash Method (LFA) results revealed that the thermal conductivity (TC) of the PCM composite significantly increased 4.84 times than the paraffin.
The chemical instability of CaS:Eu phosphors is a curial problem that hinders its practical application, especially under high temperature and humid environment. In this work, CaS:Eu capped by methacrylate-functionalized Si compound are successfully prepared under a mild condition, without seriously sacrificing the photoluminescence capability. The stability of the as-prepared samples is subsequently tested in stirred hot water (90 °C) for over a month, the outstanding hydrophobicity and chemical stability of the as-prepared samples sufficiently reserve the optical and chemical properties. Systematic characterizations are conducted to reveal the chemical features of the modified CaS:Eu phosphor.
