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- 검색키워드
- 주제어 : rod-like polymer (검색결과 7 건)
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Ali Atwi,Antoine Khater,Abbas Hijazi 한국고분자학회 2013 Macromolecular Research Vol.21 No.11
Numerical simulations and algorithms are developed to analyze the dynamics of rigid rod-like polymer particles. We developed a theoretical model based on the equations of Jeffrey for the dynamics of rigid polymer particles in fluids and the molecular dynamics by mechanical restitution for the diffusive collisions of the particles at the solid boundaries. The simulations are developed to calculate the dynamic equilibrium probability distribution functions (PDF) distributions for rod-like polymer particles in colloidal suspensions in a fluid under hydrodynamic flow inside pores with solid boundaries. They are carried out for idealized atomically flat and the realistic rough surface boundaries. To accomplish this, we investigate the influence of the surface roughness on the choice of the hydrodynamic boundary conditions. The simulation results for the PDF distributions for the spatial positions and orientations of rod-like polymer particles are calculated, over several orders of magnitude of the rotational Peclet number. They demonstrate the importance and significance of modeling in a three-dimensional spatial frame as compared to the simulation results over a two-dimensional spatial frame. In particular we are able to produce a complete topography for the PDF distributions segmented as a hierarchy in the depletion layer by covering a complete range of orientations in 3D spatial frames. These simulations permit to calculate the nematic order parameter over its tensorial representation for the colloidal suspensions of rod-like polymer particles locally, and throughout the pore space including the depletion layer. Our results for the nematic order parameter are hence innovating and represent a new input for these systems.
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Control of Polyaniline Particle Shapes
Jung, Woo-Hyuk,Lee, Young Moo,Jo, Nam-Ju,Lee, Jang-Oo WILEY-VCH Verlag 2008 Macromolecular Chemistry and Physics Vol.209 No.11
<P>Needle-like poly(aniline p-toluenesulfonic acid) complex aggregates were synthesized by oxidative polymerization, yielding conductivities of up to 3 S · cm<SUP>−1</SUP> and maximum aspect ratios of 26. Rod-like aggregates as precursors to be developed into needle-like aggregates were obtained with 1 to 2 h APS addition time at 15 °C. Flake-like polyanilines were prepared at −2 or +20 °C with 1.9 to 2.5 h of APS addition time, giving aspect ratios of 2 to 10. Plate-like polyaniline aggregates emerged when xylene was added, and an optimum xylene concentration was 15 vol.-%, giving 1.3 S · cm<SUP>−1</SUP> conductivity. The polyanilines were characterized by optical microscopy, SEM and UV-vis/NIR spectroscopy.</P><P> <img src='wiley_img/10221352-2008-209-11-MACP200800062-gra001.gif' alt='wiley_img/10221352-2008-209-11-MACP200800062-gra001'> </P>
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Effect of Stiffness on Tumbling Dynamics of Short Worm-like Polymers under Mixed Flows
이주성,김주민 한국고분자학회 2011 Macromolecular Research Vol.19 No.3
This study examined the effects of the stiffness on the tumbling dynamics of short semi-flexible polymers in mixed flows varying from simple shear to pure rotation, as an extension of a previous study on rod-like polymers. A multi bead-rod model with bending potential was adopted and represented the stiffness or persistence length of the polymers. The rotational time and angular distribution of the semi-flexible chains were examined in mixed flows. These results were compared with previous theoretical predictions and numerical simulations of rod-like polymers. Furthermore, the angular distribution of the short semi-flexible polymers was strongly dependent upon the stiffness of the polymers. These results are expected to be helpful in the development of lab-on-a-chip applications, such as the separation of short DNA molecules.
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Tumbling Dynamics of Rod-like and Semi-flexible Polymers in Simple Shear and Mixed Flows
Lee, Joo-Sung,Kim, Ju-Min The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.10
In this work, we focus on the tumbling dynamics of rod-like and semi-flexible polymers in mixed flows, which vary from simple shear to pure rotation. By employing a bead-rod model, the tumbling pathways and periods are examined with a focus on the angular distribution of their orientation. Under the mixed flows, the tumbling dynamics agreed well with earlier studies and confirmed the predicted scaling laws. We found that the angular distribution deviates from that of shear flow as the flow type approaches pure rotation. Finally, we investigated the angular distribution of $\lambda$-DNA in a shear flow and found that the present numerical simulations were in quantitative agreement with the previous experimental data.
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Stretchable Piezoelectric Nanogenerators with Organic Electrodes consisting of PEDOT Derivatives
고의진,문두경 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Piezoelectric technology which converts mechanical energy to electrical energy has received attention for an alternative of power supply in low powered electronics. Poly(vinylidene fluoride)(PVDF), organic piezoelectric material, shows good piezoelectric performance, flexibility and chemical stability, However, it is strong hydrophobic, which is not good matched with common metal electrode. Conductive organic material is a good candidate to solve this problem. PEDOT:PSS, one of the best conducting polymer, is hydrophilic and acidic not good matching with PVDF. In this study, two types of PEDOT derivatives were synthesized by oxidative polymerization. The polymers had rod-like structure, and hydrophobic. The surface matching with PVDF was very good, and the piezoelectric performance were enhanced more than the one of reference with PEDOT:PSS-CNT composite.
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Tumbling Dynamics of Rod-like and Semi-flexible Polymers in Simple Shear and Mixed Flows
이주성,김주민 한국고분자학회 2009 Macromolecular Research Vol.17 No.10
In this work, we focus on the tumbling dynamics of rod-like and semi-flexible polymers in mixed flows, which vary from simple shear to pure rotation. By employing a bead-rod model, the tumbling pathways and periods are examined with a focus on the angular distribution of their orientation. Under the mixed flows, the tumbling dynamics agreed well with earlier studies and confirmed the predicted scaling laws. We found that the angular distribution deviates from that of shear flow as the flow type approaches pure rotation. Finally, we investigated the angular distribution of λ-DNA in a shear flow and found that the present numerical simulations were in quantitative agreement with the previous experimental data.
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