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All-Trans Retinoic Acid (ATRA) nanosuspensions were prepared with a modified precipitation method. The ATRA solution in acetone was injected into pure water by an air compressor under the action of ultrasonication. Photon correlation spectroscopy results showed that the mean particle size of ATRA nanoparticles in nanosuspensions reduced from 337 nm to 155 nm as the injection velocity increased and the polydispersity index was 0.45-0.50. The morphology of ATRA nanoparticles varied with the different concentration of ATRA solution in acetone. ATRA nanoparticles showed an amorphous state and stable in 6 months. It could be concluded that this modified precipitation method could produce stable and controllable ATRA nanosuspension to a certain extent, thus benefit for higher saturation solubility.

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This study investigated the laboratory performance of basalt fiber (BF) used as an asphalt-chip seal. Specimens of the basalt fiber asphalt-chip seal (BFACS) at various contents of styrenebutadiene-rubber (SBR)-modified emulsified asphalt (EA) and BF were prepared. These were subjected to a series of tests, including plate impact, sweeping, pull-out, and direct shear tests, to inspect their bond performances. The results indicate that BF can significantly improve the performances of the aggregate retention and the interlayer bond of asphalt-chip seal. This study evaluated the performance of BFACS in terms of the low-temperature anti-cracking, interlayer bond, and skid resistance. Specimens with different EA and BF contents and lengths were fabricated to quantify their respective impacts. The findings suggest the optimal BFACS design at 1.8 kg/m 2 EA and 70 g/m 2 BF with a length of 70 mm. The BF fiber was proven to substantially enhance the performance of asphalt-chip seal compared to the controlled specimens (0 % BF). Specifically, the tensile strength, shear strength, and surface texture depth for the optimal design were increased by 29.2 %, 51.6 %, and 14.2 %, respectively.