No abstract

No abstract

No abstract

This report covers work (a) on the low temperature 00°C., -30 C., and O 0 C.) stability in Pyrex glass of 0-100% hydrogen peroxide, (b) on the effeot of container surfaces on the stability of such peroxide in th,' 50-70°C. temperature range, an'1 (c) on the mechanism of hydrogen peroxide decomposition.Carefully purified, or commercially stabilized, 90-100% hydrogen peroxide in Pyrex glass at -60 0 C. to O°C. is stable and btorable, with leas than I ppm per day (0,04% per year) decomposition.At higher temperatures (50-70 0 C.), mildly irradiated "Teflon" FEP fluorocarbon as a contalner surface is exceedingly inert to high strength hydrogon peroxide, causing less than one-third the peroxide decompouition of a paseivated aluminum surface, and less than one-half that of passivated Pyrex glass.Studies of the sitea of attaok of hydrogen peroxide on aluminum surfaces are described, together with methods of following the mechanism of decomposition of hydrogen peroxide catalyzed by metillic ions (both oxidizing and reducing) and radiation. This latter work may suggest superior stabilization systems for hydrogen popoxide. The requirements of this contract are stated aa follows: 1,The Contractor shall conduct a research program consisting of the following phases:a# Determine the inherent oulk stability of pure 90 to 100% hydrogen peroxide at temperatures ranging from -60 0 F. to +160*F. in the absence of catalyzing aurfaces oy using solid hydrogen peroxide as the wall. b,Determine the effect of wall surfaces = the bulk stability as secured above oy electron spin resonance and infrared attenuated total refleoda techniques employed on the intefAne. 0.To subject the pure hydrogen peroxide in contaot with a ataole surface, if on@ is found, to radiation to induce Inataoility and thus generate radicals whose interactions with the surface can be determined.The choice and use or the stable surfaco, if found, will be mutually a&rood upon by the procuring aotivity and the contractor before this phase of study oomnenoes.2, Thim program shall be directed toward the gathsririg of information affecting 'he stePoAility of hydrogen peroxide.Smphasia will lie on the reliability and reproducibility or the data attained. S1Section 1(a) experimentation was carried out p'rimtrily at the Virjig Deparcmeit at Wilmington, Delaware, by Dr. J, P. Paris.As a result or the above separation of effort, thit report is divided into two sections, Section I covering work at Niagara Falls, and Section II ooveri'ng work at Wilmington. SUOIMARY Section I 1.Aftor conaideraole engineering study, followed by a few scouting experimonta, it was concluded that determination of the high temperature stability of high strength H 2 0-, surrounded oy a container wall of e'rozen H 2 0 2 , while feasible, •ov'2 not be carried out within the limit of funds allocated to this contract. Suggested extenmion o•f the contract was not approved.w'o engineering studies, one on a "minimum metal container surface" and one on "solid H20 2 container eurfaoe ",are appended as A...

perature-concentration diagram for the system carbon and iron. I'laces in the diagram are found for graphite, tnartensite, cementite, ferrite, and pearlite, while austenite is discussed Of course, few, if any, of the points are known with accuracy ; but the author's scheme is a very plausihle one and will serve as a useful guide to further investigation. even though certain points should prove to need modification. The paper affords another instance of the extreme value of the phase rule, a deliionstration which is the inore necessary wlien we notice that phase rule investigations do not appear as physical chemistry in the 21'. A-urnakoff. Jour. Rtrss. Sot. 31, ' 7~7 i rS99).-The melting-points of a considerable nuniher of sodiuni and potassium amalgams of varying composition as well as those of some alloys or sodiuni with either cadmium, lead or bismuth were determined and compared. Sotliing especially novel is brought out, and the whole paper is of a prelitninary character.