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Hollandite cryptomelane, coronadite and alpha-MnO 2 form an isostructural series of the general formula A 2-y B 8-z X 16 , A being large ions such as Ba 2+ , Pb 2+ , and K + , B small and medium-sized ions such as Mn 4+ , Fe 3+ , Mn 2+ , and X in the cases investigated O 2- and OH - ions. The unit cell, which contains…
Abstract The results reported above demonstrate a progressive increase in the force of retraction τ at fixed elongation with increase in the fraction p of the structural units which are cross-linked from ρ=0.10×10 −2 to 3.0×10 −2 . Over this range, τ at 100 per cent elongation increases about thirteenfold. Swelling me…
A microcalorimeter suitable for measuring the energy of easily absorbed nuclear radiations is described. The calorimeter is an isothermal type operating at the temperature of liquid nitrogen and using the rate of vaporization of nitrogen under constant pressure as a measure of the heat input. The calorimeter is fairly…
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 Herman R. Haymond, Kermit H. Larson, Roy D. Maxwell, Warren M. Garrison, Joseph G. Hamilton; Carr…
Because natural cellulose is fundamentally fibrous, degradation—be it caused by chemical agents such as acids and alkalies, by physical agents such as grinding and ultrasonic vibration, or by biological agents such as molds and bacteria—proceeds in a manner which reflects this basic fibrillate structure. The dimension…
Regenerated cellulose film s were immersed in heavy water (99 .58 % D 20 ) at temperatures up t o 52 C for a s long as 100 hours in an attempt to effect a substitution of D for the H in the OH groups of the ccllulose. The intensity of the OH vibration in t he 3-micron region of the spectrum of t he films decreased ver…
Abstract Das System der doppelt‐ternären Salzgemische (K 2 · Na 2 · Mg) (Cl 2 · SO 4 ) im Gleichgewicht der möglichen Salze mit Schmelze stellt das Grenzsystem der wässerigen Salzlösung dar, wobei also Schmelze ohne Wasser an dem Auftreten von Flüssigem beteiligt ist. Das Zustandsbild ist, wie vom Verfasser vor Jahren…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTNT INTO PHLOROGLUCINOLM. L. Kastens and Julius F. KaplanCite this: Ind. Eng. Chem. 1950, 42, 3, 402–413Publication Date (Print):March 1, 1950Publication History Published online1 May 2002Published inissue 1 March 1950https://pubs.acs.org/doi/10.1021/ie50483a009https://doi.o…
The infra-red spectra of thin non-scattering films of NH4Br and ND4Br were obtained at 28°C, −78°C and −190°C. The spectra of both compounds in Phase III are in agreement with the x-ray symmetry, D4h7. The torsional oscillation frequencies occur at 319 cm−1 and 230 cm−1 in NH4Br and ND4Br, respectively. The spectra of…
The infra-red spectra of thin non-scattering films of NH4Cl and ND4Cl were obtained at 28°, −78° and −190°C. A convenient low temperature transmission type cell usable for such films is described. No indication of fine structure due to free rotation of the NH4+ ions was found. Instead, evidence is presented for the ex…
The importance of the reversible thermal expansion of inorganic substances is recognized by metallurgists, glass technologists, and ceramists who deal with manufactured products that are subjected to temperature cycles in service. The temperature interval involved may be small, as in dental porcelain, or large, as in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Inhibition of Foaming. II. A Mechanism for the Rupture of Liquid Films by Anti-foaming Agents.Sydney. RossCite this: J. Phys. Chem. 1950, 54, 3, 429–436Publication Date (Print):March 1, 1950Publication History Published online1 May 2002Published inissue 1 March 1950https…
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