TITLE

Viscoelastic model of phase separation: From polymer solutions to colloidal suspensions

AUTHOR(S)
Tanaka, Hajime
PUB. DATE
June 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 519 Issue 1, p52
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We recently found a new type of phase separation in condensed matter, which we call "viscoelastic phase separation", for dynamically asymmetric mixtures such as polymer solutions and polymer mixtures whose components have very different T[sub g]. Conceptually it is rather easy to accept that viscoelastic effects play a key role in polymeric systems, since polymer itself is viscoelastic matter. Here we argue that it is the interaction network of the slow component of a mixture that is the physical origin of viscoelasticity responsible for viscoelastic phase separation and the viscoelastic nature of the component itself is not its primary cause. This idea naturally leads to the conclusion that phase separation of colloidal suspensions should also belong to viscoelastic phase separation, even though colloidal particles themselves are not viscoelastic matter. It is known that a transient gel is formed upon phase separation of colloidal suspensions and emulsions. We view this fact as a fingerprint of the formation of the interaction network of the slower component (colloidal particles) of a mixture. We discuss the basic physical origin of viscoelastic phase separation, focusing on the formation of a transient gel in the initial stage of of phase separation. The possible mechanism of the collapsing of colloidal gel under gravity is also suggested.
ACCESSION #
5664996

 

Related Articles

  • Heterogeneous percolation-to-cluster transition in phase separation of an off-critical polymer. Takeno, Hiroyuki; Nakamura, Eiji; Hashimoto, Takeji // Journal of Chemical Physics;2/15/1999, Vol. 110 Issue 7, p3612 

    Investigates the phase separation kinetics of an oft-critical polymer mixture involving precolation-to-cluster transition by time-resolved light scattering and by transmission optical and electron microscopies. Process involving splitting of a single peak in the light scattering profiles.

  • Scaling and Crossover to Tricriticality in Polymer Solutions. Anisimov, M. A.; Agayan, V. A.; Gorodetskii, E. E. // JETP Letters;12/10/2000, Vol. 72 Issue 11, p578 

    We propose a scaling description of phase separation of polymer solutions. The scaling incorporates three universal limiting regimes: the Ising limit asymptotically close to the critical point of phase separation, the �ideal gas� limit for the pure solvent phase, and the tricritical...

  • Study of intra-and intermolecular interactions of ferrocene and its derivatives. Domracheva-L’vova, L. G.; Domrachev, G. A.; Nava, E. Huipe; Karyakin, N. // Doklady Physical Chemistry;Oct2008, Vol. 422 Issue 2, p265 

    The article presents a study on the molecular dynamics (MD) of ferrocenes in the gas and condensed phases. It examines the nature and function of temperature dependences for ferrocene (F), acetylferrocene (AF), 1,1'-diacetylferrocene (DAF), and 1,1'-diethylferrocene (DEF) using the MD method. It...

  • Multiple-phase behavior and its microscopic implication for 4-acrylamidosalicylic acid gel. Annaka, Masahiko; Shibayama, Mitsuhiro; Ikkai, Fumiyoshi; Sugiyama, Masaaki; Hara, Kazuhiro; Nakahira, Takayuki; Tanaka, Toyoichi // Journal of Chemical Physics;4/15/2001, Vol. 114 Issue 15 

    Poly(4-acrylamidosalicylic acid) gels exhibited multiple-phase behavior depending on their histories in the parameter space of pH and temperature. Four different phases, denoted as phase091 (as-prepared), phase244 (swollen at high pH), phase064 (heat-treated), and phase233 (swollen at high pH...

  • High-pressure light scattering apparatus to study pressure-induced phase separation in polymer solutions Yan Xiong; Xiong, Yan; Kiran, Erdogan // Review of Scientific Instruments;Mar98, Vol. 69 Issue 3, p1463 

    Examines the use of high-pressure light scattering apparatus to study the kinetics of phase separation in polymer solutions. Importance of monitoring the scattered light intensities at different angles; Determination of thermodynamic phase boundaries in polymer solutions; Dependence of pressure...

  • Wave interactions in buckling: Self-organization of a metal surface on a structured polymer layer. Joon Kwon, S.; Yoo, Pil J.; Lee, Hong H. // Applied Physics Letters;5/31/2004, Vol. 84 Issue 22, p4487 

    We report on self-organized metal surface patterns that result when a thin bilayer of a metal on a periodically corrugated polymer layer is annealed. A theoretical basis is provided for the self-organization that is verified by experiment. The wave number of the surface pattern is determined by...

  • Temperature-dependent light intensity controlled optical switching in azobenzene polymers. Ivanov, M.; Ilieva, D.; Minchev, G.; Petrova, Ts.; Dragostinova, V.; Todorov, T.; Nikolova, L. // Applied Physics Letters;5/2/2005, Vol. 86 Issue 18, p181902 

    We have investigated the dependence of the photoinduced birefringence in a low-molecular azopolymer on the exciting light intensity at elevated temperatures. We have found that in the temperature range 44–56 °C the stationary photobirefringence is higher for a low pump intensity(1 mW)...

  • Elimination of instabilities in phase shift curves in phase-modulation atomic force microscopy in constant-amplitude mode. Sugawara, Yasuhiro; Kobayashi, Naritaka; Kawakami, Masayo; Li, Yan Jun; Naitoh, Yoshitaka; Kageshima, Masami // Applied Physics Letters;5/7/2007, Vol. 90 Issue 19, p194104 

    The authors propose phase-modulation atomic force microscopy (PM-AFM) in constant-amplitude mode using automatic gain control to prevent the instabilities of cantilever dynamics. Under the condition that the driving frequency is set to the resonant frequency of the cantilever, phase shift curve...

  • A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90° twisted cell. Lin, Yi-Hsin; Chen, Ming-Syuan; Lin, Wei-Chih; Tsou, Yu-Shih // Journal of Applied Physics;7/15/2012, Vol. 112 Issue 2, p024505 

    A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90° twisted cell (T-PNLC) is demonstrated. T-PNLC consists of three layers. Liquid crystal (LC) directors in the two layers near glass substrates are orthogonal to each other and those two...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics