Facile synthesis of copper antimonite

Copper antimonite, CuSb2O4, is a candidate oxidant for use in time delays for mining detonators. A facile process for the synthesis of copper antimonite comprises the reaction of antimony trioxide with copper-ammonia complex with excess ammonia at reflux conditions (ca. 65 C) for about 1 h. Thereafter the reaction is driven to completion by driving off the ammonia by distillation. A well-crystallized product with a cuboid crystal habit approximately 4 mm in size is obtained.AEL Mining Services, the THRIP program of the Department of Trade and Industry and the National Research Foundation of South Africahttp://www.tandfonline.com/loi/gcec202015-10-31hb201

Suppressing H2 evolution by silicon powder dispersions

Silicon dispersions in water are used to produce pyrotechnic time delay compositions. The propensity of the silicon to react with water and to produce hazardous hydrogen gas must be suppressed. To this end, the effect of surface modifications and medium pH on the rate of corrosion of silicon was studied at ambient temperature. It was found that the rate of hydrogen evolution increased with increasing pH. Silanes proved to be more effective silicon corrosion inhibitors than alcohols, with vinyl tris (2-methoxyethoxy) silane producing the best results. Differential thermal analysis (DTA) studies were performed using a near-stoichiometric amount of lead chromate as oxidant. Comparable combustion behavior was observed when both the fuel and the oxidant powders were either uncoated or silane modified. Mixtures of neat oxidant with silane-coated silicon showed poor burn behavior and this was attributed to poor particle–particle mixing due to the mismatch in surface energies.The THRIP programme of the Department of Trade and Industry and the National Research Foundation as well as AELhttp://tandfonline.com/loi/uegm20ai201

e-Mobility : South African freeway management

Paper presented at the 24th Annual Southern African Transport Conference 11 - 13 July 2005 "Transport challenges for 2010", CSIR International Convention Centre, Pretoria, South Africa.This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: [email protected] URL: http://www.doctech.co.z

FACILE SYNTHESIS OF COPPER ANTIMONITE

Copper antimonite, CuSb2O4, is a candidate oxidant for use in time delays for mining detonators. A facile process for the synthesis of copper antimonite comprises the reaction of antimony trioxide with copper-ammonia complex with excess ammonia at reflux conditions (ca. 65 C) for about 1 h. Thereafter the reaction is driven to completion by driving off the ammonia by distillation. A well-crystallized product with a cuboid crystal habit approximately 4 mm in size is obtained.AEL Mining Services, the THRIP program of the Department of Trade and Industry and the National Research Foundation of South Africahttp://www.tandfonline.com/loi/gcec202015-10-31hb201