Size distribution and elastic properties of thermo-responsive polymer gel microparticles in suspension probed by ultrasonic spectroscopy

作者：Inoue Takehisa; Norisuye Tomohisa^*; Sugita Kazuki; Nakanishi Hideyuki; Qui Tran Cong Miyata

来源：Ultrasonics, 2018, 82: 31-38.

DOI：10.1016/j.ultras.2017.07.007

• Attenuation
• Sound velocity
• Microparticle
• Scattering
• Gel

The size distribution and the elasticity of thermo-responsive gel particles dispersed in water were examined in-situ by ultrasonic spectroscopy (US). Poly(N-isopropylacrylamide) (PNIPAM) gel particles, undergoing volume phase transition at 34 degrees C were synthesized by redox polymerization in emulsion, and the temperature dependence of the acoustic properties was examined. The longitudinal velocity and the attenuation coefficient of particle exhibited a drastic change at the transition temperature, indicating the increase in the mechanical properties, such the longitudinal, bulk and shear moduli, due to the shrinkage of particles upon temperature stimulation. The shear modulus of monodisperse particles, and also the stiffness of the gel particles were evaluated.

• 出版日期2018-1