Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Kwang Soo Cho, Kyu Hyun, Kyung Hyun Ahn, Seung Jong Lee; A geometrical interpretation of large amplitude oscillatory shear response. J. Rheol. 1 May 2005; 49 (3): 747–758. https://doi.org/10.1122/1.1895801 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks...

Abstract Liquid crystal elastomers (LCEs) are broadly recognized as programmable actuating materials that responsive to external stimuli, typically heat or light. Yet, soft LCEs respond changes in environmental humidity not reported, except a few examples based on rigid liquid networks with limited processing. Herein, new class of highly deformable hygroscopic LCE actuators can be prepared by versatile processing methods, including surface alignment well 3D printing is presented. The...

The development of fibrous actuators with diverse actuation modes is expected to accelerate progress in active textiles, robotics, wearable electronics, and haptics. Despite the advances responsive polymer-based actuating fibers, available are limited by exclusive reliance current technologies on thermotropic contraction along fiber axis. To address this gap, present study describes a reversible spontaneous elongation (~30%) liquid crystal elastomer fibers produced via ultraviolet-assisted...

The nonlinear response of monodisperse linear and comb polymer melts has been investigated under oscillatory shear with Fourier-transform rheology (FT-rheology). relative intensity the third harmonics (I3/1), which quantify nonlinearity, was found to depend on strain amplitude (γ0) at small medium amplitudes quadratically regardless excitation frequency, temperature, topology. From these results, for first time, we proposed new coefficient Q, is defined as Q ≡ I3/1/γ02, also zero-strain Q0,...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Manfred H. Wagner, Víctor Hugo Rolón-Garrido, Kyu Hyun, Wilhelm; Analysis of medium amplitude oscillatory shear data entangled linear model comb polymers. J. Rheol. 1 May 2011; 55 (3): 495–516. https://doi.org/10.1122/1.3553031 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley...

We report a new phenomenon that particles are selectively entrained along the corners of straight rectangular microchannel according to their deformabilities under viscoelastic flows polymer solution. The mechanism behind this is elucidated by competition between wall lift force induced particle deformability and elastic medium at corners. On basis these findings, we devise novel label-free deformability-selective cell-separation method, which achieves high-purity separation rigid rigidified...

The Protein Data Bank (PDB) file format developed at Brookhaven National Laboratory is the most popular to store biological data and widely supported by many software programs for editing visualization of macromolecular structures. Unfortunately, these structures have variety issues ranging from missing side chains and/or atoms alternate locations (rotamers). To fix flaws, one has learn a new program, compile modules, install libraries. overcome challenges, we present Repair Analysis Server...

Abstract Cholesteric liquid crystal elastomers (CLCEs) are unique anisotropic rubbers that can change their structural color in response to various stimuli such as heat, chemicals, electric fields, and mechanical stress. Methods deswelling surface alignment have been adopted prepare CLCEs; however, they limitations creating spatially controlled CLCE geometries. In this work, a direct ink writing (DIW)‐based 3D‐printable be prepared by extruding viscous CLC is developed through 3D printer...

Nonlinear response of linear and branched polymers has been investigated under medium strain amplitude oscillatory shear (strain range from 10% to 100%) with Fourier-transform rheology. A power law relationship was found between the relative third intensity (I3∕I1), which is an indicator nonlinearity, at low amplitudes. On a log-log plot, intercept slope I3∕I1 were different excitation frequencies temperatures. Simulation results three constitutive equations [Giesekus, exponential Phan-Thien...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Hyung Tag Lim, Kyung Hyun Ahn, Joung Sook Hong, Kyu Hyun; Nonlinear viscoelasticity of polymer nanocomposites under large amplitude oscillatory shear flow. J. Rheol. 1 May 2013; 57 (3): 767–789. https://doi.org/10.1122/1.4795748 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley...

Linear and nonlinear viscoelastic properties under dynamic oscillatory shear flow were used to investigate the effects of compatibilization on polypropylene (PP)/polystyrene (PS) blends. Two different nanoparticles (organo-modified clay fumed silica) at various concentrations. To analyze stress large amplitude (LAOS) flow, nonlinearity (I3/1) was calculated from FT-rheology. quantify degree dispersion particles concentrations, a new parameter, nonlinear–linear ratio (NLR ≡ normalized...

We study the mechanism of depletion stabilization and resultant microstructure aqueous suspensions nanosized silica poly(vinyl alcohol) (PVA). Rheology, small-angle light scattering (SALS), X-ray (SAXS) techniques enable us to analyze at broad length scale from single particle size a cluster aggregated particles. As PVA concentration increases, evolves bridging flocculation, steric stabilization, flocculation stabilization. To our surprise, when occurs, suspension shows scale, while...

Effects of silica nanoparticles with different natures (hydrophilicity and hydrophobicity) on (80/20) PP/PS blends were investigated via linear nonlinear rheological properties. The hydrophilic nanoparticle was fumed OX50 while the two hydrophobic ones precipitated D17 R202. SEM images revealed that could not improve morphological properties blends. On other hand, (R202 D17) improved TEM examination showed aggregated inside PS droplets, thereby making breakup (dispersed) phase into smaller...

The effects of various Cloisite nanoparticulate clays with different hydrophobicities on (80/20) polypropylene/polystyrene (PP/PS) blends were investigated using their linear and nonlinear rheological properties. In descending order hydrophobicity the four examined C20A > C10A C30B CNa+. Clays a wetting coefficient ωa between 1 −1, that is C10A, located at PP/PS polymer interfaces suppressed coalescence, while >1, CNa+, accumulated inside PS droplets increased viscosity ratios. As result,...

The compatibilizing effect of organoclay in immiscible poly(lactic acid) (PLA) and natural rubber (NR) blends was investigated through small-amplitude oscillatory shear (SAOS) large-amplitude (LAOS) tests by varying clay concentrations, mixing conditions, types clay. A quantified nonlinear parameter (I3/1) from FT-rheology complex moduli (|G*|) were used to analyze the structural development PLA/NR response added clays. nonlinear–linear viscoelastic ratio (NLR ≡ normalized...

The effects of Cloisite nanoparticulate clays on the morphologies three biodegradable polymer blends, that is, poly(lactic acid) (PLA)/poly(ε-caprolactone) (PCL), PLA/poly(butylene adipate-co-terephthalate) (PBAT), and succinate-co-adipate) (PBSA), were investigated by linear nonlinear rheological analysis. All PLA/PCL, PLA/PBAT, PLA/PBSA, blended at a ratio 80/20 wt %. Three different clays, C20A, C30B, CNa+, used as compatibilizers. Two organically modified C30B located interfaces between...

Abstract The binding interactions of the surfactants: anionic sodium dodecyl sulphate (SDS), cationic cetyltrimethylammonium bromide (CTAB), non-ionic octyl glucoside (OG), and zwitterionic 3-[Hexadecyl(dimethyl)ammonio]-1-propanesulfonate (HPS), with bovine serum albumin (BSA) were investigated by computer simulation. results disclosed that surfactants bound stably between hydrophobic subdomain IIA IIIA where tryptophan-213 residue, an important intrinsic fluorophore in BSA is housed....

Poly(β-amino esters) (PBAEs), which include tertiary amines at the β-position of ester linkages, are promising in biomaterials due to their biodegradability and pH responsiveness. Such characteristics molecular structure also appealing for designing catalyst-free covalent adaptable networks (CANs), but this has rarely been explored literature. Herein, we synthesize a series PBAE-based CANs by aza-Michael addition, using diacrylate monomers with without β-hydroxyl groups, triamine...