화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.28, No.2, 111-120, May, 2016
DOI10.1007/s13367-016-0010-y  Export Citation
Effects of silica nanoparticles on copper nanowire dispersions in aqueous PVA solutions
Seung Hak Lee, Hyeong Yong Song, and Kyu Hyun†
  • School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
E-mail:
In this study, the effects of adding silica nanoparticles to PVA/CuNW suspensions were investigated rheologically, in particular, by small and large amplitude oscillatory shear (SAOS and LAOS) test. Interesting, the SAOS test showed the complex viscosities of CuNW/silica based PVA matrix were smaller than those of PVA/CuNW without silica. These phenomena show that nano-sized silica affects the dispersion of CuNW in aqueous PVA, which suggests small particles can prevent CuNW aggregation. Nonlinearity (third relative intensity ≡ I3/1) was calculated from LAOS test results using Fourier Transform rheology (FT-rheology) and nonlinear linear viscoelastic ratio (NLR) value was calculated using the nonlinear parameter Q and complex modulus G*. Nonlinearity (I3/1) results showed more CuNW aggregation in PVA/CuNW without silica than in PVA/CuNW with silica. NLR (= [Q0(φ)/Q0(0)]/[G*(φ)/G*(0)]) results revealed an optimum concentration ratio of silica to CuNW to achieve a well-dispersed state. Degree of dispersion was assessed through the simple optical method. SAOS and LAOS test, and dried film morphologies showed nano-sized silica can improve CuNW dispersion in aqueous PVA solutions.
Keywords:copper nanowire;silica nanoparticle;SAOS;LAOS;FT-Rheology;nonlinearity I3/1;Nonlinear Linear viscoelastic Ratio (NLR)
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