Phase Separation Induced by Two Step Temperature Jump.

1992 ◽  
Vol 24 (2) ◽  
pp. 215-218 ◽  
Author(s):  
Mamoru Okada ◽  
Kyu Dae Kwak ◽  
Takuhei Nose
Keyword(s):  
Phase Separation ◽  
Temperature Jump

Growth rate of microdomains during phase separation by a two-step temperature jump

1993 ◽  
Vol 26 (15) ◽  
pp. 4047-4049 ◽  
Author(s):  
Kyu Dae Kwak ◽  
Mamoru Okada ◽  
Tsuneo Chiba ◽  
Takuhei Nose
Keyword(s):  
Growth Rate ◽  
Phase Separation ◽  
Temperature Jump

Structure Pinning During Phase-Separation of Polyamide/Ionomer Blends

1996 ◽  
Vol 461 ◽  
Author(s):  
R. A. Weiss ◽  
Y. Feng ◽  
R. Tucker ◽  
R. Xie ◽  
C. C. Han ◽  
...  
Keyword(s):  
Phase Separation ◽  
Temperature Jump ◽  
Separation Process ◽  
Temperature Dependent ◽  
Sulfonated Polystyrene ◽  
Thermally Induced ◽  
Phase Separation Process ◽  
Phase Separation Kinetics ◽  
Spinodal Region ◽  
Separation Kinetics

ABSTRACTBlends of lightly sulfonated polystyrene and poly(N,N'-dimethylethylene sebacamide) (Li-SPS/mPA) are miscible as a result of strong ion-amide complexation. The blends exhibit LCST phase behavior and an increase of the sulfonation level from 4 to 9.5 mol% raises the critical temperature by 150°C. Phase separation may be thermally induced and isthermodynamically reversible. The phase separation kinetics that occur following a temperature-jump deep into the spinodal region of the phase diagram deviate from conventional Cahn-Hilliard theory and the phase separation process stalls after a couple of hours, essentially pinning the structure at that point. The extent of phase-separation that occurs before pinning is temperature-dependent.

Picosecond dynamics of hydrogen bond rearrangements during phase separation of a triethylamine and water mixture

2014 ◽  
Vol 13 (6) ◽  
pp. 891-897 ◽  
Author(s):  
Shinji Kajimoto ◽  
Nak-Hyun Seong ◽  
Hiroshi Fukumura ◽  
Dana D. Dlott
Keyword(s):  
Hydrogen Bond ◽  
Phase Separation ◽  
Temperature Jump ◽  
Water Mixture ◽  
Bond Scission

A picosecond temperature jump experiment reveals that phase separation in a liquid triethylamine (TEA)–water mixture started from hydrogen bond scission of TEA–water aggregates in TEA-rich regions and then in water-rich regions.

Quaternary structure of Limulus polyphemus hemocyanin

1978 ◽  
Vol 36 (2) ◽  
pp. 176-177
Author(s):  
T. Wichertjes ◽  
E.J. Kwak ◽  
E.F.J. Van Bruggen
Keyword(s):  
Electron Microscopy ◽  
Functional Properties ◽  
Horseshoe Crab ◽  
Temperature Jump ◽  
Quaternary Structure ◽  
Crystallographic Analysis ◽  
Limulus Polyphemus ◽  
Oxygen Binding ◽  
X Ray ◽  
Intact Molecule

Hemocyanin of the horseshoe crab (Limulus polyphemus) has been studied in nany ways. Recently the structure, dissociation and reassembly was studied using electron microscopy of negatively stained specimens as the method of investigation. Crystallization of the protein proved to be possible and X-ray crystallographic analysis was started. Also fluorescence properties of the hemocyanin after dialysis against Tris-glycine buffer + 0.01 M EDTA pH 8.9 (so called “stripped” hemocyanin) and its fractions II and V were studied, as well as functional properties of the fractions by NMR. Finally the temperature-jump method was used for assaying the oxygen binding of the dissociating molecule and of preparations of isolated subunits. Nevertheless very little is known about the structure of the intact molecule. Schutter et al. suggested that the molecule possibly consists of two halves, combined in a staggered way, the halves themselves consisting of four subunits arranged in a square.

Bulk standards for low-temperature biological x-ray microanalysis

1984 ◽  
Vol 42 ◽  
pp. 282-283
Author(s):  
P. Echlin ◽  
M. McKoon ◽  
E.S. Taylor ◽  
C.E. Thomas ◽  
K.L. Maloney ◽  
...  
Keyword(s):  
Phase Separation ◽  
Low Temperature ◽  
Analytical Method ◽  
Salt Solutions ◽  
Absolute Concentration ◽  
Cooling Process ◽  
X Ray ◽  
The Absolute ◽  
Analytical Procedures ◽  
Electrical Conductors

Although sections of frozen salt solutions have been used as standards for x-ray microanalysis, such solutions are less useful when analysed in the bulk form. They are poor thermal and electrical conductors and severe phase separation occurs during the cooling process. Following a suggestion by Whitecross et al we have made up a series of salt solutions containing a small amount of graphite to improve the sample conductivity. In addition, we have incorporated a polymer to ensure the formation of microcrystalline ice and a consequent homogenity of salt dispersion within the frozen matrix. The mixtures have been used to standardize the analytical procedures applied to frozen hydrated bulk specimens based on the peak/background analytical method and to measure the absolute concentration of elements in developing roots.

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