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Two differently sized latexes are synthesized by emulsion polymerization and mixed with a sonicated single wall carbon nanotube (SWCNT) dispersion to prepare a 3% SWCNT composite mixture. The mixture is spin coated at various spin speed rates and times over a glass substrate in order to make a thin transparent conductive layer. The weight fraction of the 30 nm relative to 70 nm sized p(MMA-co-t-BA) latex particles is varied, while the amount of SWCNTs is kept constant. We find a maximum in the electrical conductivity upto 370 S/m, depending on the solid content and spin speed and time, when the coating is prepared at 3-5% of the smaller latex particles. We also find a more than two fold increase in conductivity measuring parallel to the radius of spin coating relative to perpendicular to that. Atomic Force Microscopy (AFM) points at the existence of lanes of latex particles in the spin coated thin layer, while large area Transmission Electron Microscopy (TEM) shows that the SWCNTs are aligned over a spin coated grid fixed on the same samples. The conductivity pattern on the surface is extracted by correlated data and translated into the direction of the SWCNTs in the thin layer.
This article was published in the following journal.
Name: Langmuir : the ACS journal of surfaces and colloids
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A milky, product excreted from the latex canals of a variety of plant species that contain cauotchouc. Latex is composed of 25-35% caoutchouc, 60-75% water, 2% protein, 2% resin, 1.5% sugar & 1% ash. RUBBER is made by the removal of water from latex.(From Concise Encyclopedia Biochemistry and Molecular Biology, 3rd ed). Hevein proteins are responsible for LATEX HYPERSENSITIVITY. Latexes are used as inert vehicles to carry antibodies or antigens in LATEX FIXATION TESTS.
A technique for detecting short-lived reactive FREE RADICALS in biological systems by providing a nitrone or nitrose compound for an addition reaction to occur which produces an ELECTRON SPIN RESONANCE SPECTROSCOPY-detectable aminoxyl radical. In spin trapping, the compound trapping the radical is called the spin trap and the addition product of the radical is identified as the spin adduct. (Free Rad Res Comm 1990;9(3-6):163)
Molecules which contain an atom or a group of atoms exhibiting an unpaired electron spin that can be detected by electron spin resonance spectroscopy and can be bonded to another molecule. (McGraw-Hill Dictionary of Chemical and Technical Terms, 4th ed)
Strongly cationic polymer that binds to certain proteins; used as a marker in immunology, to precipitate and purify enzymes and lipids. Synonyms: aziridine polymer; Epamine; Epomine; ethylenimine polymer; Montrek; PEI; Polymin(e).
Hearing loss due to damage or impairment of both the conductive elements (HEARING LOSS, CONDUCTIVE) and the sensorineural elements (HEARING LOSS, SENSORINEURAL) of the ear.