Ferromagnetism in Linear Chains

1983 ◽  
pp. 143-191 ◽  
Author(s):  
R. D. Willett ◽  
R. M. Gaura ◽  
C. P. Landee
Keyword(s):  
Linear Chains

Electrogeneration of Conducting Poly(α-tetrathiophene). Effect of Solution Stirring and Detection of Linear Oligomers

2003 ◽  
Vol 68 (7) ◽  
pp. 1326-1344 ◽  
Author(s):  
Francesc Estrany ◽  
Ramon Oliver ◽  
Esther García ◽  
Esther Gualba ◽  
Pere-Lluís Cabot ◽  
...  
Keyword(s):  
Ion Pairs ◽  
Polymer Chains ◽  
Polymerization Process ◽  
Anodic Process ◽  
Cathodic Peak ◽  
Linear Chains ◽  
Monomer Solution ◽  
Ir Analysis ◽  
Microscopy Images ◽  
Tof Ms

The anodic oxidation of α-tetrathiophene on Pt was studied in a 1.0 mM monomer solution in 0.1 M LiClO4 in 45:35:20 acetonitrile/ethanol/DMF. Three consecutive oxidation peaks were detected by cyclic voltammetry, along with a cathodic peak related to the reduction of electroactive polarons formed during the first anodic process. Uniform, adherent, insoluble and black polymer films were obtained by chronoamperometry at 1.000 V vs Ag|AgCl corresponding to the first oxidation-polymerization process. Stirring of monomer solution promotes the production of polymer, favoring the oxidation of polymer chains with the incorporation of more doping ClO4- ions and ion pairs of Li+ClO4- in their monomeric units. The conductivity of the polymer obtained under stirring was three orders of magnitude higher than that synthesized from a quiescent solution. The scanning electron microscopy images also showed much more uniform films under stirring. This behavior points to the existence of less crosslinking in the polymer and the production of longer linear chains when the solution is stirred. IR analysis of these materials confirmed the formation of crosslinked chains with predominance of β-β linkages. Short linear oligomers such as the dimer, trimer and tetramer were detected in all polymers by MALDI-TOF-MS, thus showing a radical polycondensation as initial electropolymerization mechanism. A larger proportion of linear oligomers is formed under solution stirring.

scholarly journals Binding Interactions of Peptide Aptamers

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 6055
Author(s):  
Roger R. C. New ◽  
Tam T. T. Bui ◽  
Michal Bogus
Keyword(s):  
Amino Acid ◽  
Binding Site ◽  
Cyclic Peptides ◽  
Binding Interactions ◽  
Peptide Aptamers ◽  
Linear Peptide ◽  
Signalling Molecules ◽  
Antibody Binding Site ◽  
Linear Chains ◽  
Protein Receptors

Peptide aptamers are short amino acid chains that are capable of binding specifically to ligands in the same way as their much larger counterparts, antibodies. Ligands of therapeutic interest that can be targeted are other peptide chains or loops located on the surface of protein receptors (e.g., GCPR), which take part in cell-to-cell communications either directly or via the intermediary of hormones or signalling molecules. To confer on aptamers the same sort of conformational rigidity that characterises an antibody binding site, aptamers are often constructed in the form of cyclic peptides, on the assumption that this will encourage stronger binding interactions than would occur if the aptamers were simply linear chains. However, no formal studies have been conducted to confirm the hypothesis that linear peptides will engage in stronger binding interactions with cyclic peptides than with other linear peptides. In this study, the interaction of a model cyclic decamer with a series of linear peptide constructs was compared with that of a linear peptide with the same sequence, showing that the cyclic configuration does confer benefits by increasing the strength of binding.

Behavior of free linear chains of polystyrene in a network of methyl methacrylate in toluene

1993 ◽  
Vol 26 (22) ◽  
pp. 6092-6099 ◽  
Author(s):  
Jyotsana Lal ◽  
Jacques Bastide ◽  
Rama Bansil ◽  
Francois Boue
Keyword(s):  
Methyl Methacrylate ◽  
Linear Chains

Lubricant Removal, Degradation, and Recovery on Particulate Magnetic Recording Media

1992 ◽  
Vol 114 (1) ◽  
pp. 61-67 ◽  
Author(s):  
V. J. Novotny ◽  
T. E. Karis ◽  
N. W. Johnson
Keyword(s):  
Bulk Viscosity ◽  
Magnetic Recording ◽  
Photoelectron Spectroscopy ◽  
Removal Rate ◽  
Lateral Diffusion ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Removal Rates ◽  
Linear Chains ◽  
Mechanical Durability

Lubrication of particulate magnetic recording media improves their mechanical durability in sliding and flying by several orders of magnitude compared with unlubricated media. Lubricant removal, degradation, and recovery were studied using microslit scanning Fourier transform infrared spectroscopy and microspot scanning X-ray photoelectron spectroscopy. These techniques measure the total and surface lubricant amounts in the porous film, respectively. Lubricant dynamics were compared for two physisorbed polyperfluoroalkylether lubricants of similar molecular weight but different molecular structure—Y with a CF3 side group and Z with linear chains. The bulk viscosity of Y was about ten times higher than the viscosity of Z. In sliding, the lubricant removal rate of Y was significantly higher than that of Z while in flying the removal rates were reversed. Removal rates in sliding were orders of magnitude higher than those in flying. Effective lateral diffusion coefficients estimated from the rate of lubricant reflow back to the depleted tracks were close to inversely proportional to the bulk viscosity. During sliding and flying both lubricants degraded as evidenced by chemically altered lubricant detected on the surfaces after dissolution of undegraded lubricant.

Magic Monatomic Linear Chains for Mn Nanowire Self-Assembly on Si(001)

2010 ◽  
Vol 105 (11) ◽  
Author(s):  
Jian-Tao Wang ◽  
Changfeng Chen ◽  
Enge Wang ◽  
Yoshiyuki Kawazoe
Keyword(s):  
Self Assembly ◽  
Linear Chains

Adaptation of macrocyclization equilibrium theory to the formation of intramolecular excimers in end-labeled linear chains

1990 ◽  
Vol 23 (3) ◽  
pp. 867-870
Author(s):  
Abraham Pannikottu ◽  
Wayne L. Mattice
Keyword(s):  
Equilibrium Theory ◽  
Linear Chains

Superdelocalizabilities of Linear Chains

1997 ◽  
Vol 70 (6) ◽  
pp. 1307-1310 ◽  
Author(s):  
Makoto Isihara
Keyword(s):  
Linear Chains
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