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Generating surface-functional microstructures is an effective way to enhance the bonding strength of metal and carbon fiber-reinforced polymer (CFRP). In this study, different microstructural morphologies consisting of two different patterns were generated on the aluminum alloy (A7075) surface via laser processing. The experimental results indicated that different microstructural morphologies contribute to the enhancement of the shear strength of lap joints. The maximum shear strength of these joints was almost four times stronger than that of lap joints without the microstructures. In addition, the investigation indicated that the shear strength was not only determined by surface roughness and contact area but also by the arrangement of different microstructures. These results are mainly due to the combination of mechanical interlocking and physical adhesion. Finally, the corresponding mechanical models of Al-CFRP lap joints were proposed according to the bonding mechanisms and fracture behaviors.

A freestanding SiO2–TiO2 monolith with bicontinuous structure was prepared via a one pot sol-gel reaction. This monolith was fully characterized by using field emission scanning electron microscopy...

A facile one pot method has been applied to fabricate large-sized freestanding titania-silica monolithic aerogels (TSMA). The obtained TSMA was characterized by scanning electron micrograph (SEM), Energy dispersive spectrometer (EDS), X-ray powder diffraction (XRD) and nitrogen adsorption measurements. SEM results show the TSMA has bicontinuous inner structure and large macropores (through-pores), which are favorable for the liquid infiltration. XRD results demonstrate the TSMA is anatase and nitrogen adsorption results reveal its high specific surface area of 445.9 m2/g. To maximize the catalytic activity of the as-prepared TSMA, an annular photocatalytic reactor has been specially designed and fabricated. With the apparatus, the as-prepared TSMA exhibited outstanding catalytic performance, which degraded glyphosate completely within 180 min of photocatalytic reaction. The kinetic rate (k value) of the photocatalytic reaction reaches 0.0242 min−1. Ion chromatography results indicate that glyphosate was mainly mineralized to inorganic ions such as PO43− and NO3−, etc. Keywords: Facile, Self-supporting, Photocatalytic reactor, Monolithic aerogels, Glyphosate

In this study, an electrical heat-assisted method was adopted to drill a small hole (diameter of 1–3 mm) in hard-to-cut materials, namely, 1Cr18Ni9Ti stainless steel and ZGMn13 high-manganese steel. The flank wear of the twist bit and the surface quality of the small hole were investigated. The relationships among the flank wear, feeding, heating current, and cutting speed were analyzed quantitatively. Flank wear of twist drill directly affected the service life of the drill used in electric hot drilling. The dynamic effects of heating current, cutting speed, and feed rate on the surface roughness and machining hardening of the hole-wall are also discussed. Experimental data indicated that the surface roughness after electric hot drilling can also be obtained by coarse grinding and the surface hardness of the hole-wall had no obvious change. These findings showed that electric hot drilling has irreplaceable advantages in improving the service life of the drill bit and surface quality of the hole-wall.

In this research, we have synthesized pure monolithic titania using nanocasting technology with hydrophilic urea formaldehyde resin as a template. Powder X-ray diffraction and scanning electron microscopy results have shown that the titania monolith has interwoven skeletons and textural pores, and the crystalline is anatase. The prepared titania monolith was employed as a photocatalyst under UV light by using methyl orange (MO) as a target. Photocatalytic results showed that concentration of the MO solution decreased nearly 87% after 60 min of degradation, and after four repeated cycles of reuse, photocatalytic activity of the regenerated catalyst showed no significant change.

Exposed heavy metal ions have led to serious pollution and significant health problems to human beings. To eliminate these ions from the environment, in this study, a remediation method based on recycling magnetic nanoparticles is proposed. Long alkyl chain derivatized magnetic nanoparticles were fabricated, and then dodecyl mercaptan was assembled onto the functional nanoparticles via hydrophobic interaction. Since mercapto moieties can form molecular complex with many heavy metal ions via chelation, the proposed material was used to retrieve these ions from water samples. It is noteworthy that, as dodecyl mercaptan was attached onto the magnetic particles via hydrophobic interaction, it can be easily removed by washing with methanol. As a result, the nanoparticles can be recovered for recycling usage, which would be economical for environmental remediation. The material was characterized by scanning electron microscopy, nitrogen sorption, infrared/Raman spectrometry and elemental analysis. Ag+and Pb2 +w...

A facile method was proposed for the synthesis of carbosil particles. In this method, silica particles were first saturated with carbon precursor solution (styrene, divinylbenzene, or their mixture). After the subsequent polymerization and carbonization process, carbosils were successfully prepared. The carbon content in the obtained carbosil particles can be easily tailored by controlling the styrene or divinylbenzene ingredients in the reaction system. Further controlling the carbon content by adding toluene into the reaction mixture was also investigated. The influence of carbon content on the porous structure of the composite was studied in detail by nitrogen adsorption measurements.

In pharmaceutical science, construction of drug delivery system based on various carriers is a great challenge. Here we proposed a new silica carrier for drug delivery. The carrier is characterized by penetrable macropores and large pore volume, which renders it an ideal carrier for drug loading especially for macromolecular drugs. Bovine serum albumin (BSA) and oxaprozin were used as models to investigate its delivery behavior. From the results, it demonstrates that the drug loading capacity is very high (for BSA, it reaches 212.2 wt% [drug/carrier]). It is also found that an ultra-fast release for oxaprozin was achieved on this carrier, indicating the material is suitable for constructing enhanced delivery platform for specific drugs to improve the bioavailability.