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目的对超声刺激产生的热效应下海藻酸钠微球机械特性变化进行模型分析。方法采用压缩实验,对微球压缩率、压应力进行记录,通过赫兹模型测量其剪切模量。在不同的超声刺激条件下,如改变超声刺激时间、超声刺激强度和超声刺激脉冲比率,检测超声刺激后微球水溶液温度和微球剪切模量的变化。对微球在不同温度下,剪切模量的变化进行模型化分析。通过实验再次验证模型对于预测微球剪切模量的高度可行性。结果超声刺激引起被刺激水溶液温度升高以及海藻酸钠微球剪切模量的升高;通过模型分析,获得海藻酸钠微球剪切模量和超声刺激后与水溶液温度相关性,以及二者的关系函数。结论海藻酸钠微球剪切模量和水溶液温度的关系函数可作为不同温度下微球剪切模量的预测模型,为海藻酸钠微球在具有温度变化环境中的应用提供良好的基础研究支持。
Objective To analyze the changes of mechanical properties of sodium alginate microspheres under the thermal effect of ultrasonic stimulation. Methods The compressibility and compressive stress of microspheres were recorded by compression experiments. The shear modulus was measured by Hertz model. Under different ultrasonic stimulation conditions, such as changing the time of ultrasonic stimulation, the intensity of ultrasonic stimulation and the rate of ultrasonic stimulation pulse, the changes of microsphere aqueous solution temperature and microsphere shear modulus after ultrasonic stimulation were measured. The changes of the shear modulus of the microspheres under different temperatures were modeled. The feasibility of the model for predicting the shear modulus of microspheres is verified again by experiments. Results Ultrasound stimulation caused the temperature of aqueous solution to be stimulated and the shear modulus of sodium alginate microspheres increased. Through the model analysis, the shear modulus of sodium alginate microspheres and the temperature dependence of aqueous solution after ultrasonic stimulation were obtained, The relationship between the function. Conclusion The function of the shear modulus of sodium alginate microspheres and the temperature of aqueous solution can be used as a predictive model for the shear modulus of microspheres at different temperatures and provide a good basic research for the application of sodium alginate microspheres in a temperature-dependent environment stand by.