METHOD OF PREPARING CERIUM DIOXIDE NANOPARTICLES

    公开(公告)号:CA2662782A1

    公开(公告)日:2008-03-13

    申请号:CA2662782

    申请日:2007-09-04

    Abstract: A method of making cerium dioxide nanoparticles includes: a) providing an aqueous reaction mixture having a source of cerous ion, a source of hydroxi de ion, a nanoparticle stabilizer, and an oxidant at an initial temperature no higher than about 2O°C; b) mechanically shearing the mixture and causing it to pass through a perforated screen, thereby forming a suspension of ceri um hydroxide nanoparticles; and c) raising the initial temperature to achiev e oxidation of cerous ion to eerie ion and thereby form cerium dioxide nanop articles having a mean diameter in the range of about 1 nm to about 15 nm. T he cerium dioxide nanoparticles may be formed in a continuous process.

    ADITIVOS DE COMBUSTIBLE QUE CONTIENEN NANOPARTÍCULAS DE DIÓXIDO DE CERIO CON DISEÑO DE RED.

    公开(公告)号:MX2011006461A

    公开(公告)日:2011-11-18

    申请号:MX2011006461

    申请日:2008-12-17

    Abstract: Un proceso para hacer nanopartículas de dióxido de cerio que contienen al menos un material de transición (M) que comprende (a) proporcionar una mezcla de reacción acuosa que contiene una fuente de ión ceroso, una fuente de uno o más iones metálicos de transición (M), una fuente de ión de hidróxido, al menos un estabilizador de nanopartículas, y un oxidante a una temperatura inicial en un rango de alrededor de 200C alrededor de 950C; (b) cortar mecánicamente la mezcla y provocar que pase a través de una pantalla perforada, formando así una suspensión homogéneamente distribuída de nanopartículas de hidróxido de cerio; y (c) proporcionar condiciones de temperatura efectivas para lograr la oxidación de ión ceroso a ión cérico, formando así una corriente de producto que contiene nanopartículas de dióxido de cerio que contienen metal de transición, Ce1-xMxO2, en donde "x" tiene un valor de alrededor de 0.3 a alrededor de 0.8. Las nanopartículas así obtenidas, tienen una estructura de fluorita cúbica, una media de diámetro hidrodinámico en un rango de alrededor de 1 nm a alrededor de 10nm, y un diámetro geométrico menor a alrededor de 4 nm. Las nanopartículas cristalinas de dióxido de cerio que contienen metal de transición pueden usarse para preparar una dispersión de las partículas en un medio no polar.

    METHOD OF PREPARING CERIUM DIOXIDE NANOPARTICLES

    公开(公告)号:CA2662782C

    公开(公告)日:2015-05-12

    申请号:CA2662782

    申请日:2007-09-04

    Abstract: A method of making cerium dioxide nanoparticles includes: a) providing an aqueous reaction mixture having a source of cerous ion, a source of hydroxide ion, a nanoparticle stabilizer, and an oxidant at an initial temperature no higher than about 2O°C; b) mechanically shearing the mixture and causing it to pass through a perforated screen, thereby forming a suspension of cerium hydroxide nanoparticles; and c) raising the initial temperature to achieve oxidation of cerous ion to eerie ion and thereby form cerium dioxide nanoparticles having a mean diameter in the range of about 1 nm to about 15 nm. The cerium dioxide nanoparticles may be formed in a continuous process.

    METHOD OF CONDITIONING AN INTERNAL COMBUSTION ENGINE

    公开(公告)号:CA2662769A1

    公开(公告)日:2008-03-13

    申请号:CA2662769

    申请日:2007-09-04

    Inventor: REED KENNETH J

    Abstract: A method of Improving the efficiency of a diesel engine provided with a s ource of diesel fuel includes the steps of: a) adding to the diesel fuel a r everse-micellar composition having an aqueous first disperse phase that incl udes a free radical initiator and a first continuous phase that includes a f irst hydrocarbon liquid, a first surfactant, and optionally a co-surfactant, thereby producing a modified diesel fuel; and b) operating the engine, ther eby combusting the modified diesel fuel. The efficiency of a diesel engine p rovided with a source of diesel fuel and a source of lubricating oil can als o be improved by modifying the lubricating oil by the addition of a stabiliz ed nanoparticulate composition of cerium dioxide. The efficiency of a diesel engine can also be improved by adding to the diesel fuel a reverse-micellar composition that includes an aqueous disperse phase containing boric acid o r a borate salt.

    CERIUM DIOXIDE NANOPARTICLE-CONTAINING FUEL ADDITIVE

    公开(公告)号:CA2662765A1

    公开(公告)日:2008-03-13

    申请号:CA2662765

    申请日:2007-09-04

    Inventor: REED KENNETH J

    Abstract: A fuel additive composition includes: a) a reverse-micellar composition h aving an aqueous disperse phase that includes cerium dioxide nanoparticles i n a continuous phase that includes a hydrocarbon liquid, a surfactant, and o ptionally a co-surfactant and b) a reverse micellar composition having an aq ueous disperse phase that includes a cetane improver effective for improving engine power during fuel combustion. A method of making a cerium-containing fuel additive includes the steps of: a) providing a mixture of a nonpolar s olvent, a surfactant, and a co-surfactant; and b) combining the mixture with an aqueous suspension of stabilized cerium dioxide nanoparticles.

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