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Articles 3571 - 3581 of 3581

Full-Text Articles in Materials Chemistry

A Study Of The Cooling Curve Of Several Waxes And Various Binary Mixtures Of These Waxes, Casimir A. Smyk May 1933

A Study Of The Cooling Curve Of Several Waxes And Various Binary Mixtures Of These Waxes, Casimir A. Smyk

Bachelors’ Theses

A cooling curve may be defined as a graphic representation of the relationship which exists in the elapse of time and temperature of a substance surrounded by a medium of a temperature lower than itself. There is no heat added to the substance and the only heat taken away from the substance is by means of the surrounding medium. It is time plotted against temperature. Time on the x-axis and temperature on the y-axis. Many methods have been mentioned for the determination of purity and identification of a wax. But the methods are not standardized because of the length and …

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Wax Analysis With Special Reference To Montan, Spermaceti, And Chinese Insect Wax, Margaret M. Plonsker, Margaret E. Seippel Jan 1933

Wax Analysis With Special Reference To Montan, Spermaceti, And Chinese Insect Wax, Margaret M. Plonsker, Margaret E. Seippel

Bachelors’ Theses

The presentation of this thesis under joint authorship finds its justification in the fact that much of the experimental work, though performed individually, is of such a nature as to warrant a unified description. In this way the reader is afforded a better representation and clearer conception of the problem, and a substantial guide for further investigation. Though much work has been done in the field of wax analysis, little is known of the higher fatty acids and alcohols of many of the waxes. Their isolation has been infrequent, and few if any of their derivatives have been formed. It …

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The Electrodeposition Of Chromium And Iron Alloy, Duane J. Windau May 1932

The Electrodeposition Of Chromium And Iron Alloy, Duane J. Windau

Bachelors’ Theses

The plating of stainless steel, or more correctly, the plating of iron chromium alloys is among the recent projects undertaken by the steel industry to improve its products. Publications on this industrial endeavor are few, although undoubtedly there is considerable work going on. The reason for the sudden interest in stainless steel may be traced to the interesting and valuable properties of chromium steels and especially the stainless steels. However, articles made entirely of stainless steel are expensive and therefore cheaper substitutes have been considered, names the plating of a base metal with chrom-iron alloys. This project will be of …

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Substitution Of Hydrofluoric Acid For Sulphuric Acid In Chromium Plating, Leonard Schulze May 1931

Substitution Of Hydrofluoric Acid For Sulphuric Acid In Chromium Plating, Leonard Schulze

Bachelors’ Theses

Chromium plating or the electrodeposition of chromium from chromic acid baths has been an accomplished fact for almost a century. However, it has not been until the last few years that considerable attributive information has been published to make the mechanism of the process sufficiently understood to permit its commercial operation.1 Most of the scientific information published on chromium plating thus far is general there being very little specific information revealed as yet. Material, as shall be referred to occasionally, may be read about its early successful applications stressing the unusual properties, advantages, interests, and activities but very little …

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A Study Of The Plating Prohibitive Properties Of Various Separators, Bruno J. Pozorski May 1931

A Study Of The Plating Prohibitive Properties Of Various Separators, Bruno J. Pozorski

Bachelors’ Theses

The problem of this thesis is to study the plating prohibitive properties of the various materials commonly used in the manufacturing of separators, and to indicate which material would be most serviceable and feasible in a separator. At one time positives and negatives were kept not more than 0.25 inches apart, with the idea of reducing the intervening layers of electrolyte, and, therefore, the internal resistance of the cell, as much as possible. It was, however, found that the output could actually be increased by putting the plates at greater distances, the fact being that the larger bulk of solution …

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Hardness And Porosity In Chromium Plating, Waldemar Wick May 1931

Hardness And Porosity In Chromium Plating, Waldemar Wick

Bachelors’ Theses

In recent years chromium plating has been subjected to much research due to its ever-increasing demand. The results of these investigations have demonstrated the valuable properties of this plate. Of its many advantageous properties, hardness is one of the outstanding ones, but its application in industry is as yet not fully realized. This being due to the fact that it is difficult to produce a plate that is uniform and does not chip. Many chemists have investigated the porosity of the chromium plate in order to produce a coating that could be used for protective purposes, but there seems to …

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The Electro-Deposition Of The Binary System Copper-Cadmium., Allen Stratton Smith 1906-1966 Jan 1931

The Electro-Deposition Of The Binary System Copper-Cadmium., Allen Stratton Smith 1906-1966

Electronic Theses and Dissertations

No abstract provided.

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A Study Of Gel Formation In Kerosene In Contact With Sodium, Jerome M. Weller May 1930

A Study Of Gel Formation In Kerosene In Contact With Sodium, Jerome M. Weller

Bachelors’ Theses

The origin of the problem to be considered in this paper is traced to the observations of John R. Koob, Ph.D., Head of the Chemistry Department of Marquette University. It was his experience to note that the kerosene, in a bottle, containing cut sodium for the organic laboratory, had solidified to a gel, resembling Vaseline in appearance.

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The Study Of The Effects Of Different Metallic Soaps On The Water Content Of Water-In-Gasoline Emulsions, Lynn D. Wilson May 1930

The Study Of The Effects Of Different Metallic Soaps On The Water Content Of Water-In-Gasoline Emulsions, Lynn D. Wilson

Bachelors’ Theses

The study of emulsions and emulsification is of very great theoretical and practical interest. From the standpoint of pure science it throws much light on the problems of surface tension, surface concentration, absorption, surface films, electrical double layers. Brownian movement, and the general theory of disperse systems and colloids. It is also of importance in biological science, e.g., the adsorption of fats and the permeability of membranes. When industrial and applied science are considered, it is remarkable how many subjects of interest and importance are dependent on a knowledge of the formation, behavior, and stability of emulsions. In this connection, …

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A Critical Examination Of The Kjeldahl Method For The Determination Of Nitrogen, Edward F. Danforth Jan 1914

A Critical Examination Of The Kjeldahl Method For The Determination Of Nitrogen, Edward F. Danforth

Archived Theses and Dissertations

No abstract provided.

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The Commercial Preparation Of Ammonium Nitrate From Ammonium Sulfate And Sodium Nitrate, Carl Emil Lauer Jan 1914

The Commercial Preparation Of Ammonium Nitrate From Ammonium Sulfate And Sodium Nitrate, Carl Emil Lauer

Archived Theses and Dissertations

No abstract provided.

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