Temperature-tunable scattering strength based on the phase transition of liquid crystal infiltrated in well-defined macroporous random media
Temperature-tunable scattering strength based on the phase transition of liquid crystal infiltrated in well-defined macroporous random media
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DOI：
10.1016/j.optmat.2005.11.032
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发表时间：
2007-04
影响因子：
3.9
通讯作者：
S. Murai;K. Fujita;Takayuki Hirao;K. Nakanishi;K. Hirao
中科院分区：
文献类型：
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作者：
S. Murai;K. Fujita;Takayuki Hirao;K. Nakanishi;K. Hirao
研究了一种以正十六烷为基的大孔液晶分子渗透整体材料对可见光（488 nm）的散射强度随温度的变化关系。采用溶胶-凝胶法，通过诱导与硅醇盐水解缩合平行的相分离，制备了具有互连孔和有机硅氧烷骨架的大孔凝胶。用液晶4-氰基-4 ′-正戊基联苯（5CB）渗透干燥凝胶的互连大孔，所述液晶在35°C下经历双相和各向同性之间的相变。5CB填充凝胶的散射强度的温度变化测量通过相干背散射和总透射，这两者都表现出显着的变化，在5CB的相变温度附近的传输平均自由程。结果表明，5CB填充的整体凝胶的散射强度可以通过温度外部调节。
Temperature dependence of scattering strength for the visible light (488nm) has been investigated for a siloxane-based macroporous monolith infiltrated with liquid crystal molecules. A macroporous gel with interconnected pores and organosiloxane skeletons is prepared via a sol–gel route by inducing the phase separation parallel to the hydrolysis and condensation of silicon alkoxide. The interconnected macropores of the dried gel are infiltrated with liquid crystal 4-cyano-4′-n-pentylbiphenyl (5CB) which undergoes the phase transition between nematic and isotropic at 35°C. Temperature variation of the scattering strength for 5CB-filled gel is measured by means of coherent backscattering and total transmission, both of which exhibit a significant change in transport mean free path at around the phase transition temperature of 5CB. The results indicate that the scattering strength of 5CB-filled monolith gel can be tuned externally via temperature.