摘要:
An electrochromic element useful in an electrochromic glass or mirror device and a process for making such element. The element is a five-layered structure including an electrolyte ion conducting layer interposed between first and second inorganic electrochromic layers which are interposed between a pair of conductive electrodes. The second inorganic electrochromic layer is amorphous. The first and second inorganic electrochromic layers are different and are capable of exhibiting color-forming properties complementary to one another upon the incorporation of at least one H, Li, Na, K, Ag, Cu or Tl ion. The electrolyte ion conducting layer may be a copolymer of ethylene oxide, butylene oxide or methyl glycidyl ether, and optionally a small amount of allyl glycidyl ether, along with an ionizable salt, or may be a polyurethane gel formed by reacting the copolymer with triisocyanate, along with an ionizable salt. The second inorganic electrochromic layer comprises a transition element chalconide or halide which exhibits a color change when shifting between the +2 and +3 valence states or between the +3 and +4 valence states. The second inorganic electrochromic layer may be produced by an electrochemical process, a chemical process, a physical process or by a solid state process. The electrochromic element may also comprise a plurality of five-layer structures in tandem, each pair separated by a substrate. The electrochromic element of the invention is also useful as a supercapacitor.
摘要:
The invention relates to the use of a compound of formula KMgF3 to trap metals present in the form of fluorides and/or of oxyfluorides in a gaseous or liquid phase.It also relates to a compound of formula KMgF3 which has a surface specific area at least equal to 30 m2/g and at most equal to 150 m2/g and also to its methods of preparation.The invention notably finds application in the nuclear industry, in which it can advantageously be used to purify uranium hexafluoride (UF6) present in a gaseous or liquid stream, with regard to metal impurities which are also present in this stream.
摘要:
A method for converting UO3 and/or U3O8 into hydrated UO4 of formula UO4.nH2O wherein n is 2 or 4, comprising the following successive steps: a) preparing an aqueous suspension of a UO3 powder and/or a U3O8 powder; b) adding hydrogen peroxide H2O2 to the aqueous suspension of a UO3 and/or U3O8 powder, converting the UO3 and/or U3O8 into hydrated UO4 and precipitating, crystallizing the hydrated UO4 in the suspension; g) recovering the precipitate, crystals of UO4 hydrate; h) optionally, washing the recovered UO4 hydrate precipitate, crystal(s); i) optionally, repeating step d); j) optionally, drying the precipitate, the crystals; wherein the addition of H2O2 to the aqueous suspension is carried out so that the suspension contains a stoichiometric excess of H2O2 relatively to the stoichiometry of the reaction from UO3: UO3+nH2O+H2O2→UO4.nH2O+H2O (1) or of the reaction from U3O8 UO2.67+1.33H2O2+nH2O→UO4.nH2O+H2O (2) and the pH of the suspension is maintained in steps a) and b) at a value comprised between 2 and 3.
摘要翻译:将UO 3和/或U 3 O 8转化为式UO·4H 2 O的水合UO 4的方法,其中n为2或4,包括以下连续步骤:a)制备UO 3粉末和/或U 3 O 8粉末的水性悬浮液; b)向UO 3和/或U 3 O 8粉末的水性悬浮液中加入过氧化氢H 2 O 2,将UO 3和/或U 3 O 8转化为水合UO 4并沉淀,使悬浮液中的水合UO4结晶; g)回收沉淀物,UO4水合物晶体; h)任选地,洗涤回收的UO4水合物沉淀物,晶体; i)任选地,重复步骤d); j)任选地,干燥沉淀物,晶体; 其中向含水悬浮液中加入H 2 O 2使得悬浮液相对于来自UO 3 :OO 3 + n H 2 O + H 2 O 2→UO 4·n H 2 O + H 2 O(1)的反应的化学计量比,含有化学计量过量的H 2 O 2 来自U3O8 UO2.67 + 1.33H2O2 + nH2O-> UO4·nH2O + H2O(2)的反应,并且悬浮液的pH在步骤a)和b)中保持在2和3之间的值。
摘要:
A method for testing a seal of a part that includes an electrolyte of an electrochemical cell, the method including: forming a closed cavity delimited by a first outer surface of the part including the electrolyte to be tested; contacting a second outer surface of the part, opposite the first surface, with a first fluid; circulating a second fluid, separate from the first fluid, through the closed cavity between an inlet and an outlet of this cavity; and analyzing the fluid extracted via the outlet of the cavity, to detect possible presence of the first fluid.
摘要:
Thin film coatings for solid state storage batteries and electrochromic energy conservation devices are now formed on low temperature glass and plastic substrates by an ion-assisted RF deposition process. The attachment of such coated glass or plastic substrates to existing windows in situ allows ordinary plate glass windows in homes, office buildings and factories to be converted to "smart-windows" resulting in a substantial savings in heating and air conditioning costs.
摘要:
A method for converting UO3 and/or U3O8 into hydrated UO4 of formula UO4.nH2O wherein n is 2 or 4, comprising the following successive steps: a) preparing an aqueous suspension of a UO3 powder and/or a U3O8 powder; b) adding hydrogen peroxide H2O2 to the aqueous suspension of a UO3 and/or U3O8 powder, converting the UO3 and/or U3O8 into hydrated UO4 and precipitating, crystallizing the hydrated UO4 in the suspension; c) recovering the precipitate, crystals of UO4 hydrate; d) optionally, washing the recovered UO4 hydrate precipitate, crystal(s); e) optionally, repeating step d); f) optionally, drying the precipitate, the crystals; wherein the addition of H2O2 to the aqueous suspension is carried out so that the suspension contains a stoichiometric excess of H2O2 relatively to the stoichiometry of the reaction from UO3: UO3+nH2O+H2O2→UO4.nH2O+H2O (1) or of the reaction from U3O8 UO2.67+1.33H2O2+nH2O→UO4.nH2O+1.33H2O (2), and the pH of the suspension is maintained in steps a) and b) at a value comprised between 2 and 3.
摘要翻译:将UO 3和/或U 3 O 8转化为式UO·4H 2 O的水合UO 4的方法,其中n为2或4,包括以下连续步骤:a)制备UO 3粉末和/或U 3 O 8粉末的水性悬浮液; b)向UO 3和/或U 3 O 8粉末的水性悬浮液中加入过氧化氢H 2 O 2,将UO 3和/或U 3 O 8转化为水合UO 4并沉淀,使悬浮液中的水合UO4结晶; c)回收沉淀物,UO4水合物晶体; d)任选地,洗涤回收的UO4水合物沉淀物,晶体; e)任选地,重复步骤d); f)任选地,干燥沉淀物,晶体; 其中向含水悬浮液中加入H 2 O 2使得悬浮液相对于来自UO 3 :OO 3 + nH 2 O + H 2 O 2→UO 4·n H 2 O + H 2 O(1)或反应的反应的化学计量比含有化学计量过量的H 2 O 2 从U3O8 UO2.67 + 1.33H2O2 + nH2O→UO4·nH2O + 1.33H2O(2),并且悬浮液的pH在步骤a)和b)中保持在2和3之间的值。
摘要:
The invention relates to a coating for protecting materials against reactions with atmosphere at high temperatures. The coating according to the invention comprises a mixture of zirconium diboride and colloidal silica, advantageously with various additives such as silicon carbide. The coating according to the invention can, for example, efficiently protect carbon and graphite up to 1350.degree. C.
摘要:
An agent for trapping the radioactivity of the fission products which appear in a nuclear fuel based on sintered uraniferous oxides in the course of irradiation characterized in that it comprises a stable oxygenated compound, a combination of at least two metallic oxides and at least one oxide of a non-radioactive isotope of the radioactive fission product or products whose radioactivity is to be trapped.
摘要:
A nuclear fuel element comprising sintered pellets based on uraniferous oxide which are surrounded by a metallic sheath and permitting trapping of the fission products which appear in the course of irradiation characterized in that the pellets contain or are coated with or that the sheath is internally coated with an agent for trapping said fission products based on mixed metallic oxide comprising SiO.sub.2 and one at least of the oxides ZrO.sub.2 or CeO.sub.2.
摘要:
A method for testing a seal of a part that includes an electrolyte of an electrochemical cell, the method including: forming a closed cavity delimited by a first outer surface of the part including the electrolyte to be tested; contacting a second outer surface of the part, opposite the first surface, with a first fluid; circulating a second fluid, separate from the first fluid, through the closed cavity between an inlet and an outlet of this cavity; and analyzing the fluid extracted via the outlet of the cavity, to detect possible presence of the first fluid.