scholarly journals Interactions between surfaces with adsorbed polymers: poor solvent. 2. Calculations and comparison with experiment

1986 ◽  
Vol 19 (5) ◽  
pp. 1374-1381 ◽  
Author(s):  
Kevin Ingersent ◽  
Jacob Klein ◽  
Philip Pincus
Keyword(s):  
Comparison With Experiment ◽  
Adsorbed Polymers ◽  
Poor Solvent

Forces between surfaces with adsorbed polymers. 3. Θ solvent. Calculations and comparison with experiment

1990 ◽  
Vol 23 (2) ◽  
pp. 548-560 ◽  
Author(s):  
Kevin Ingersent ◽  
Jacob Klein ◽  
Philip Pincus
Keyword(s):  
Comparison With Experiment ◽  
Adsorbed Polymers

The Volume Fraction Profile of Terminally Adsorbed Polymers

1991 ◽  
Vol 248 ◽  
Author(s):  
R. J. Composto ◽  
T. Mansfield ◽  
G. Beaucage ◽  
R. S. Stein ◽  
D. R. Iyengar ◽  
...  
Keyword(s):  
Concentration Profile ◽  
Volume Fraction ◽  
Neutron Reflectivity ◽  
Similar Molecular Weight ◽  
Parabolic Profile ◽  
Grafting Density ◽  
Tethered Chains ◽  
Adsorbed Polymers ◽  
Unperturbed Dimension ◽  
Poor Solvent

AbstractWe have used neutron reflectivity to measure the concentration profile of carboxylic acid-terminated polystyrene at the liquid/solid interface. Two isotopic systems were studied: (1) deuterated polystyrene (DPS) in cyclohexane and (2) polystyrene (PS) in deuterated cyclohexane. Although measured at 24°C (a poor solvent condition), the high grafting density of PS tethered chains causes the chains to weakly stretch to 3-5 times its unperturbed dimension. Although of similar molecular weight, the height of the DPS layer is about 50% higher than that of the PS. In both systems, the volume fraction of polymer near the wall is ∼ 0.60. For the DPS system, reflectivity profiles can be simulated using a parabolic profile with a depletion layer at the silicon-liquid interface. However, in the PS system, no depletion is observed. Here, the shape. of the PS concentration profile is parabolic with a rounded tail.

Dynamic light scattering from gels in a poor solvent

1978 ◽  
Vol 39 (9) ◽  
pp. 955-960 ◽  
Author(s):  
E. Geissler ◽  
A.M. Hecht
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Poor Solvent

Alignment of Rigid-Rod Polypeptide Chains by Solvent Quenching

2003 ◽  
Vol 771 ◽  
Author(s):  
Yuli Wang ◽  
Ying Chih Chang
Keyword(s):  
Tilt Angle ◽  
Rigid Rod ◽  
Polypeptide Chains ◽  
Poor Solvent

AbstractWe introduce a simple “solvent quenching” approach to align the rigid-rod à-helical poly(α-benzyl-L-glutamate) (PBLG) chains in the surface-grafted monolayer. By sequentially treating with a good solvent and a poor solvent, a unidirectionally aligned PBLG monolayer with an average tilt angle as small as 3° is obtained.

SPALLATION YIELDS FROM HIGH ENERGY PROTON BOMBARDMENT OF HEAVY ELEMENTS

1957 ◽  
Vol 35 (1) ◽  
pp. 21-37 ◽  
Author(s):  
J. D. Jackson
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Heavy Elements ◽  
Collective Effects ◽  
Comparison With Experiment ◽  
Energy Proton ◽  
Stringent Test ◽  
Neutron Evaporation ◽  
Nuclear Processes ◽  
Mev Protons

The Monte Carlo calculations of McManus and Sharp (unpublished) for the prompt nuclear processes occurring upon bombardment of heavy elements by 400 Mev. protons are combined with a description of the subsequent neutron evaporation to determine spallation cross sections for comparison with experiment. The model employed is a schematic one which suppresses the detailed characteristics of individual nuclei, but gives the over-all behavior to be expected. Many-particle and collective effects such as alpha particle emission and fission are ignored. The computed cross sections are presented in a variety of different graphical forms which illustrate quantitatively the qualitative picture of high energy reactions first given by Serber (1947). The calculations are in general agreement with existing data when fission is not an important effect, but the agreement does not imply a very stringent test of the various features of the model.

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