Polymerisation of thiophen derivatives. Part IV. The formation of some 9-thia-1 : 2- and 9-thia-3 : 4-benzofluorene derivatives
W. Davies, F. C. James, S. Middleton and Q. N. Porter, J. Chem. Soc., 1955, 1565 DOI: 10.1039/JR9550001565
Materials Literature
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Mixed liquid crystals. Part II. The effect of structure on the transition temperatures of mixed liquid crystals
J. S. Dave and M. J. S. Dewar, J. Chem. Soc., 1955, 4305 DOI: 10.1039/JR9550004305
Magnetic Fields in Small Ferrite Bodies with Applications to Microwave Cavities Containing Such Bodies
The microwave magnetic field in a small ferrite sphere and thin circular cylinder is found in first approximation. In a circularly polarized exciting field the internal field is again circularly polarized. The ratio of the internal field to the exciting field is 3(µ±α+2)-1 for the sphere and 2(µ±α+1)-1 for the cylinde…
Infra-red spectra of graphitic oxide
D. Hadži and A. Novak, Trans. Faraday Soc., 1955, 51, 1614 DOI: 10.1039/TF9555101614
Über die Beziehungen zwischen der Konstitution und den Eigenschaften von Alkylbenzolsulfonaten mit jeweils einer geraden oder verzweigten Alkylkette bis zu 18 Kohlenstoff‐Atomen I
Abstract Technisch wichtige Eigenschaften definierter, reiner Alkylsulfonate und einiger binärer Gemische wurden eingehend untersucht: Kritische Micellbildungskonzentration, Erniedrigung der Oberflächenspannung, Benetzungs‐, Schaum‐ und Waschvermögen. Die erhaltenen Ergebnisse werden ausführlich diskutiert.
Practical Method for Estimating Surface Tensions of Solutions
Mikio Tamura, Michio Kurata, Hisashi Odani; Practical Method for Estimating Surface Tensions of Solutions, Bulletin of the Chemical Society of Japan, Volum
The Anodic Treatment of Aluminum in Sulfuric Acid Solutions
High purity aluminum was anodized in sulfuric acid solutions at various concentrations (5– 50%), temperatures (10°– 50°C), time periods (2 – 60 min), and current densities (1.7 – 6.2 amp/dm 2 ). The coating weight, metal loss, coating ratio, sealing weight gain, dyed color, density, and coating chemical dissolution ra…
Thermoelectric Behavior of Nickel Oxide
Measurements have been made on the thermoelectric power of several nickel oxide samples containing foreign ions. Using an energy model recently proposed for nickel oxide, the effect of the nature and concentration of additions on the Fermi level, hole concentration, and mobility is derived and discussed. For most of t…
Magnetic Cooling
After a historical introduction the general principles of the magnetic cooling method are outlined. First, the case of the ideal paramagnetic salt is treated, and this is followed by a discussion of the electric and magnetic interaction effects which cause departures from ideal behaviour, and set a lower limit to the…
Ionic Equilibria between Clay and Dilute Salt Solutions
Abstract Theoretical considerations are presented for the evaluation of the free energy change that accompanies an exchange of cations between a clay and a solution. Also, a means is proposed for characterizing the effective concentration of the ionic atmosphere of a substance that exhibits cationic exchange. Results…
Factors Affecting the Formation of Anodic Oxide Coatings in Sulfuric Acid Electrolytes
The amount of sulfate found in anodic coatings formed on pure aluminum anodes in sulfuric acid electrolytes increased as the current density and concentration of acid increased, but decreased as the temperature was raised. Chemical analysis showed that the coatings consisted substantially of Al 2 O 3 and SO 3 with pra…
Mass Spectrometric Study of Gaseous Species in the Si-SiO2 System
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Richard F. Porter, William A. Chupka, Mark G. Ingiiram; Mass Spectrometric Study of Gaseous Speci…
Effect of Porosity on Thermal Stress Fracture
Sintered alumina with from 4 to 50% porosity was prepared by incorporating crushed naphthalene in a casting slip. Thermal stress resistance was determined from the radial temperature difference required to fracture hollow cylinders under steady‐state conditions. Thermal stress resistance decreases with increasing poro…
The Crystallization of Anodic Tantalum Oxide Films in the Presence of a Strong Electric Field
Crystallization of amorphous anodic oxide films on tantalum may be accomplished by holding at temperatures in the neighborhood of room temperature provided a strong electric field is present in the film. This results in crystalline areas consisting of pie‐shaped polycrystalline segments surrounded by coiled‐up cylinde…
Interaction of polydimethylsiloxanes with swelling agents
Abstract The swelling of a crosslinked polydimethylsiloxane in a number of swelling agents has been measured. Values of the solvent‐polymer interaction parameter, χ 1 , have been computed and have been compared with the solubility parameters of the swelling agents and with other data from the literature. The magnitude…
Aging of the Properties of Barium Titanate and Related Ferroelectric Ceramics
Barium titanate ceramics show an aging effect during which the dielectric constant and electromechanical coupling factor decrease while the elastic constants and Q increase. At room temperature, this process takes over a year to stabilize. By heating the ceramic up to 70°C the process is considerably shortened. A comp…
Structure and Properties of the Condensed Phosphates. VII. Hydrolytic Degradation of Pyro- and Tripolyphosphate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Properties of the Condensed Phosphates. VII. Hydrolytic Degradation of Pyro- and TripolyphosphateJ. R. Van Wazer, E. J. Griffith, and J. F. McCulloughCite this: J. Am. Chem. Soc. 1955, 77, 2, 287–291Publication Date (Print):January 1, 1955Publication History Pu…
A Theory of the Kinetics of Formation of Anode Films at High Fields
A theory is presented for the anodic oxidation of metals such as tantalum and aluminum. The theory of Mott and Cabrera has been extended to include effects of space charge on kinetics of the process in the highfield case. The behavior of these systems is shown to depend critically on a dimensionless factor, δ, which i…
The Thermodynamic Stability of Refractory Borides
Reactions between nitrogen gas and metal borides and between graphite and metal borides have been studied to obtain qualitative information on the relative stabilities of the metal boride phases. At high temperatures many borides are inert toward carbon or nitrogen. The most stable borides are found to be those of Ti,…
Some Properties of Ferrites in Connection with Their Chemistry
After an elementary introduction on the origin of magnetism, intended for the reader who is not acquainted with the subject, it is shown how the molecular-field hypothesis can account for the magnetic properties of ferromagnetics and antiferromagnetics, and for the noncompensated antiferromagnetics, with which latter…