摘要:
The present invention is in the field of nanoparticles, their preparation and their use as pinning centers in superconductors. In particular the present invention relates to nanoparticles comprising an oxide of Sr, Ba, Y, La, Ti, Zr, Hf, Nb, or Ta, wherein the nanoparticles have a weight average diameter of 1 to 30 nm and wherein an organic compound of general formula (I), (II) or (III) or an organic compound containing at least two carboxylic acid groups on the surface of the nanoparticles (I) (II) (III) wherein a is 0 to 5, b and c are independent of each other 1 to 14, n is 1 to 5, f is 0 to 5, p and q are independent of each other 1 to 14, and e and f are independent of each other 0 to 12.
摘要:
A process for preparing a meseporous material, e.g., transition metal oxide, sulfide, selenide or telluride, Lanthanide metal oxide, sulfide, selenide or telluride, a post-transition metal oxide, sulfide, selenide or telluride and metalloid oxide, sulfide, selenide or telluride. The process comprises providing an acidic mixture comprising a metal precursor, an interface modifier, a hydrotropic or lyotropic ion precursor, and a surfactant; and heating the acidic mixture at a temperature and for a period of time sufficient to form the mesoporous material, A mesoporous material, prepared by the above process. A method of controlling nano-sized wall crystallinity and mesoporosity in mesoporous materials. The method comprises providing an acidic mixture comprising a metal precursor, an interface modifier, a hydrotropic or lyotropic ion precursor, and a surfactant; and heating the acidic mixture at a temperature and for a period of time sufficient to control.nano-sized wall crystallinity and mesoporosity in the mesoporous material. Mesoporous materials and a method of tuning structural properties of mesoporous materials.
摘要:
A high dielectric constant (k ≥ 40), low leakage current (≤ 10 -6 A/cm 2 at 0.6 nm or lower equivalent oxide thickness) non-crystalline metal oxide is described, including an oxide of two or more compatible metals selected from the group consisting of bismuth, tantalum, niobium, barium, strontium, calcium, magnesium, titanium, zirconium, hafnium, tin, and lanthanide series metals. Metal oxides of such type may be formed with relative proportions of constituent metals being varied along a thickness of such oxides, to enhance their stability. The metal oxide may be readily made by a disclosed atomic layer deposition process, to provide a metal oxide dielectric material that is usefully employed in DRAM and other microelectronic devices.
摘要翻译:描述了高介电常数(k≥40),低漏电流(0.6nm以下的等于10-6A / cm 2或更低的等效氧化物厚度)非结晶金属氧化物,其包括两种或更多种相容金属的氧化物,其选自 由铋,钽,铌,钡,锶,钙,镁,钛,锆,铪,锡和镧系金属组成的组。 可以形成这种类型的金属氧化物,其中组成金属的相对比例沿着这种氧化物的厚度变化,以增强它们的稳定性。 金属氧化物可以通过公开的原子层沉积方法容易地制成,以提供可用于DRAM和其它微电子器件的金属氧化物介电材料。
摘要:
본 발명은 산화인듐 및 산화탄탈륨을 포함하는 것을 특징으로 하는 투명도전막에 관한 것이다. 상기 투명도전막은 도펀트로 4족, 5족, 6족, 7족, 8족, 9족, 10족, 11족, 12족, 13족, 14족 및 15족으로 이루어진 군에서 선택되는 1종 또는 2종 이상의 원소의 산화물을 추가적으로 포함할 수 있다. 본 발명에 따른 투명도전막은 저온 열처리 공정에서도 결정화되고, 저온에서 저저항 특성을 가져 전기전도도가 우수하고 열안정성이 우수하다.
摘要:
The invention provides a process for exfoliating a 3-dimenisonal layered material to produce a 2-dimensional material, said process comprising the steps of mixing the layered material in a water-surfactant solution to provide a mixture wherein the material and atomic structural properties of the layered material in the mixture are not altered; applying energy, for example ultrasound, to said mixture; and applying a force, for example centrifugal force, to said mixture. The invention provides a fast, simple and high yielding process for separating 3-dimensional layered materials into individual 2-dimensional layers or flakes, which do not re-aggregate, without utilising hazardous solvents.
摘要:
A process for treating a feedstock comprising tantalum- and/or niobium- containing compounds is provided. The process includes contacting the feedstock with a gaseous fluorinating agent, thereby to fluorinate tantalum and/or niobium present in the feedstock compounds. The resultant fluorinated tantalum and/or niobium compounds are recovered.
摘要:
The current invention relates to a method of making metal oxide nanoparticles comprising the reaction of - at least one metal oxide precursor (P) containing at least one metal (M) with - at least one monofunctional alcohol (A) wherein the hydroxy group is bound to a secondary, tertiary or alpha-unsaturated carbon atom - in the presence of at least one aliphatic compound (F) according to the formula Y 1 -R 1 -X-R 2 -Y 2 , wherein - R 1 and R 2 each are the same or different and independently selected from aliphatic groups with from 1 to 20 carbon atoms, - Y 1 and Y 2 each are the same or different and independently selected from OH, NH 2 and SH, and - X is selected from the group consisting of chemical bond, -O-, -S-, -NR 3 -, and CR 4 R 5 , wherein R 3 , R 4 and R 5 each are the same or different and represent a hydrogen atom or an aliphatic group with from 1 to 20 carbon atoms which optionally carries functional groups selected from OH, NH 2 and SH. This invention also relates to metal oxide nanoparticles, to a method of making dispersions of said nanoparticles and to dispersions containing them.
摘要:
A process for the preparation of a niobium compound of formula (I): DaNbßE?O-3-d (I) wherein D is an alkali metal (e.g. Li, Na, K, Rb, Cs and/or Fr), alkaline earth metal (such as Ba, Ca, Mg and/or Sr), La and/or Bi and may be present as a mixture of two or more metals; E is Ta, Sb and/or Fe and may be present as a mixture of two or more metals; a is a positive number ß is a positive number ? is zero or a positive number d is a number 0 = d = 0.5; and wherein the formula (I) has the perovskite or tungsten bronze structure; comprising spray pyrolising a solution, for example an aqueous solution, comprising metal (D) ions, Nb ions and if present, metal (E) ions.
摘要:
A composition and method for coatings (120) applied to articles (100), are disclosed. A composition can be applied onto a surface of an object, the composition comprising a polymer and a metal alkoxide precursor. A metal oxide is formed from the metal oxide precursor by a process comprising hydrolyzing the metal oxide precursor followed by heating the coated article. The coated articles comprise medical devices including medical implants.