巻号一覧
40 巻 (2012)
- 5 号 p. 209-
- 4 号 p. 157-
- 3 号 p. 119-
- 2 号 p. 53-
- 1 号 p. 1-
40 巻, 5 号
選択された号の論文の8件中1～8を表示しています
- |<
- <
- 1
- >
- >|
受賞講演論文
-
渡辺 宏2013 年 40 巻 5 号 p. 209-222
発行日: 2013/01/15
公開日: 2013/01/17
ジャーナル フリーSoftmatters exhibit rich rheological properties because of their high susceptibility (softness). Fundamentals of those properties can be elucidated on the basis of multiple experimental method(s) detecting the molecular and/or structural dynamics in the materials and of analyses based on the molecular expression(s) of the stress specific to respective materials. From this point of view, this article summarizes the results of studies for non-entangled and entangled homopolymers, miscible polymer blends, and Brownian suspensions. The emphasis is placed on competition/interaction of fast and slow components in the systems, which is similar, in many senses, to the competition/interaction in the human society.抄録全体を表示PDF形式でダウンロード (1939K) -
保田 正範, 倉内 奈美, 中村 美希, 平野 太一, 細田 真妃子2013 年 40 巻 5 号 p. 223-228
発行日: 2013/01/15
公開日: 2013/01/17
ジャーナル フリーViscosity is an essential mechanical property for the industrial use of liquid materials, such as transportation, mixing and coating. The measurement technique of the viscosity has made, however, less progress in recent years and the conventional method cannot satisfy user's demands. Requirement arises, for example, to the rapid observation, small quantity of samples, and completely closed system for the viscosity measurement. We introduce here the Electro-Magnetically Spinning (EMS) method, which can solve problems of the conventional methods. This method has unique features such as, non-contact and rapid measurement, small sample volume, disposable usage, measurement under hermetically sealed condition. We also introduce some applications of the EMS viscometer.抄録全体を表示PDF形式でダウンロード (1289K) -
藤井 修治2013 年 40 巻 5 号 p. 229-237
発行日: 2013/01/15
公開日: 2013/01/17
ジャーナル フリーThe rheological properties of layered systems such as a thermotropic smectic liquid crystal and surfactant lyotropic lamellar phase are studied from the viewpoint of structural rheology. Many defects included into these layered systems significantly influence their physical and rheological properties. For instance, an unbinding transition of dislocation loops in the smectic phase drives the smectic-nematic transition. And oily streak defects in the lyotorpic lamellar phase provide the physical origin of the elasticity. We show how these structural defects are closely associated with linear- and nonlinear-rheological behaviors. And we show that these defects dominate not only their rheology but also the non-equilibrium structural transition such as shear-induced lamellar/onion transition.抄録全体を表示PDF形式でダウンロード (1648K)
論文
-
辻 知宏, 蝶野 成臣2013 年 40 巻 5 号 p. 239-244
発行日: 2013/01/15
公開日: 2013/01/17
ジャーナル フリーNumerical simulations of shear flows of a tumbling-type nematic liquid crystal (4-Octyl-4'-cyanobiphenyl) between concentric cylinders have been performed using the Leslie-Ericksen continuum theory. The shear flow is imposed on the liquid crystal by rotating the inner cylinder. In the Leslie-Ericksen theory, the local averaged orientation of the rodlike liquid crystalline molecules is represented with a unit vector called the director, and small perturbations are added on the initial director field to obtain the director escape from the shear plane. Depending on the curvature of the flow geometry and the shear rate and also on the perturbations, four kinds of director behaviors emerge, which are the in-plane, non-twisted out-of-plane, 2π-twisted out-of-plane, and periodic director behaviors. Finally, we discuss the probability of the emergence of the director behaviors.抄録全体を表示PDF形式でダウンロード (1584K) -
Yasuya Nakayama, Kiyoyasu Kataoka, Toshihisa Kajiwara2013 年 40 巻 5 号 p. 245-252
発行日: 2013/01/15
公開日: 2013/01/17
ジャーナル フリーIn multi-component soft matter, interface properties often play a key role in determining the properties of the overall system. The identification of the internal dynamic structures in non-equilibrium situations requires the interface rheology to be characterized. We have developed a method to quantify the rheological contribution of soft interfaces and evaluate the dynamic modulus of the interface. This method reveals that the dynamic shear responses of interfaces in bilayer systems comprising polypropylene and three different polyethylenes can be classified as having hardening and softening effects on the overall system: a interface between linear long polymers becomes more elastic than the component polymers, while large polydispersity or long-chain-branching of one component make the interface more viscous. We find that the chain lengths and architectures of the component polymers, rather than equilibrium immiscibility, play an essential role in determining the interface rheological properties.抄録全体を表示PDF形式でダウンロード (684K) -
Shigeru Yao, Makoto Sakurai, Hiroshi Sekiguchi, Hiroaki Otsubo, Takuya ...2013 年 40 巻 5 号 p. 253-256
発行日: 2013/01/15
公開日: 2013/01/17
ジャーナル フリーWe recently discovered that a block co-polymer constructed with side chain crystalline monomer and solvent compatible monomer (Side Chain Crystalline Block Co-Polymer : SCCBC) have an ability to decrease viscosity of concentrated polyethylene (PE) particle suspension system incredibly. This suspension system shows the Thermal Rheological (TR) Fluid effect, which is reversible temperature dependence of viscosity, with increasing temperature and the viscosity increases to almost the original value of the suspension without the SCCBC.
In this time, we have investigated the SCCBC as a surface modifier of PE porous membrane. We investigated a permeation rate of this membrane by measuring the conductivity of Li ion and of their temperature dependence. In this investigation we found a transition temperature that the conductivity changed discontinuity. This function is able to applicable to a Li ion battery.抄録全体を表示PDF形式でダウンロード (855K) -
清水 賀之, 伊藤 博史, 貞包 忠義, 山口 隆司2013 年 40 巻 5 号 p. 257-266
発行日: 2013/01/15
公開日: 2013/01/17
ジャーナル フリーA new contact model, which is called ‘multi-visco-elastic contact model’, is developed in the Discrete Element Method (DEM) to represent rheological characteristics of fat spread and simulate the dynamics in a kneading machine for improving the uniformity and the efficiency of filling-up of fat spread. The new rheological contact model is connected with a Maxwell component and several Kelvin components in series. Using the new contact model, the overall bulk material composed of small-sized discrete elements shows a time-dependent rheological characteristics, since the model represents rheological characteristics at each contact point. Several simple simulations, which show stress relaxation and creep characteristics, are conducted to verify the new model. The results are in good agreement with analytical ones. Also creep simulations, which mimic lab-scale creep experiments, are conducted. The results are compared with the experimental ones. As a result, it is clarified that the multi-visco-elastic contact model represents rheological characteristics of fat spread well and the scheme enables one to simulate dynamics of fat spread during the process.抄録全体を表示PDF形式でダウンロード (2163K) -
Daisuke Ishii, Daisuke Tatsumi, Takayoshi Matsumoto2013 年 40 巻 5 号 p. 267-272
発行日: 2013/01/15
公開日: 2013/01/17
ジャーナル フリーEffect of aluminum sulfate, Al2(SO4)3, on dispersion state of sodium carboxymethylcellulose, NaCMC, in aqueous solution was investigated by rheological measurements and X-ray photoelectron spectroscopy (XPS). Rheological properties of NaCMC aqueous solutions containing Al2(SO4)3 were investigated using a cone-plate type rheometer. When NaCMC concentration was 0.5 wt %, shear stress of the solution slightly decreased with increasing concentration of Al2(SO4)3. On the other hand, when NaCMC concentration was 5 wt %, the shear stress increased with increasing Al2(SO4)3 concentration. In this case, both dynamic storage and loss moduli also increased. These results suggest that the addition of Al2(SO4)3 increased crosslinking density and caused heterogeneous aggregation of NaCMC. This was confirmed by the fact that diluted Al2(SO4)3-containing NaCMC solution was separated to microgel-like particle and homogeneous solution. XPS revealed that aluminum ion was concentrated in the microgel-like particle. From these results, dispersion state of NaCMC in aqueous solution containing Al2(SO4)3 was modeled as microgel-like particle containing concentrated aluminum ions are suspended in the network of NaCMC chains.抄録全体を表示PDF形式でダウンロード (463K)
- |<
- <
- 1
- >
- >|