Xiaojun Wang

We synthesize Sb/Sb₂O₃ nanoparticles by the oxidation of Sb nanoparticles at 100, 200, and 300 °C. The half sodium-ion batteries with Sb/Sb₂O₃-200 exhibit the optimal performance with a charge capacity of 540 mAh g⁻¹ after 100 cycles at 0.1 A g⁻¹, maintaining up to six times more capacity than pure Sb, and superior rate performance with 95.7% retention after cycling at varied current densities. One reason for this is that Sb/Sb₂O₃-200 is at exactly the optimum ratio of Sb₂O₃:Sb and the particle size of Sb/Sb₂O₃ to ensure both high capacity for Na⁺ and small stress during sodiation/desodiation, which is confirmed by the diffusion–stress coupled results. It indicates that increasing the ratio of Sb₂O₃:Sb causes a decrease of Mises equivalent stress, radial stress, and tangential stress in the range of 1:1–3.5:1, and an increase in the range of 3.5:1–4:1. These stresses decrease with a particle radius in the range of 30–50 nm and increase with a particle radius in the range of 50–70 nm. Additionally, another reason is related to the formation of cycling-induced coral-like Sb, which can promote Na⁺ diffusion, relieve cycling-induced volume changes, and provide exceptional Na⁺ storage.

角膜的刚度降低是导致圆锥角膜的关键因素，角膜中胶原纤维刚度和纤维分散程度与角膜生物力学性能密切相关。本文通过建立基于角膜微结构即考虑胶原纤维的准分子激光原位角膜磨镶术（LASIK）术前和术后人眼角膜有限元模型，模拟了可视化角膜生物力学分析仪的检测过程，并与临床实际检测结果对比，确定屈光手术前后人眼角膜材料的超弹性本构参数及角膜胶原纤维刚度模量。研究发现 LASIK 术后，角膜胶原纤维刚度模量较术前明显增大，并与中央角膜厚度（CCT）高度相关；术前术后角膜胶原纤维刚度模量与对应中央角膜厚度的预测关系分别为：k_{1 术前} = exp（9.14 − 0.009CCT _术前），k_{1 术后} = exp（8.82 − 0.008CCT _术后）。根据本文的研究结果，可由患者的中央角膜厚度值估算其术前术后胶原纤维刚度模量，进而建立与患者实际情况更相符的个性化角膜模型，为更准确地预测角膜安全手术切削量提供理论参考。

The biomechanical properties of the cornea should be taken into account in the refractive procedure in order to perform refractive surgery more accurately. The effects of the ablation depth and repair time on the elastic modulus of the rabbit cornea after laser in situ keratomileusis (LASIK) are still unclear. In this study, LASIK was performed on New Zealand rabbits with different ablation depth (only typical LASIK flaps were created; residual stroma bed was 50 or 30% of the whole cornea thickness respectively). The animals without any treatment were served as normal controls. The corneal thickness was measured by ultrasonic pachymetry before animals were humanly killed after 7 or 28 days post-operatively. The corneal elastic modulus was measured by uniaxial tensile testing. A mathematical procedure considering the actual geometrics of the cornea was created to analyze the corneal elastic modulus. There were no obvious differences among all groups in the elastic modulus on after 7 days post-operatively. However, after 28th days post-operatively, there was a significant increase in the elastic modulus with 50 and 30% residual stroma bed; only the elastic modulus of the cornea with 30% residual stroma bed was significantly higher than that of 7 days. Changes in elastic modulus after LASIK suggest that this biomechanical effect may correlate with the ablation depth and repair time.