Abstract:
A moving bed filtration process for the production of sphere based crystals is disclosed. Sphere based crystals having an opal-like structure or an inverse opal-like structure can be produced in accordance with the invention.
Abstract:
Provided herein are methods for forming one or more silicon nanostructures, such as silicon nanotubes, and a silica-containing glass substrate. As a result of the process used to prepare the silicon nanostructures, the silica-containing glass substrate comprises one or more nanopillars and the one or more silicon nanostructures extend from the nanopillars of the silica-containing glass substrate. The silicon nanostructures include nanotubes and optionally nanowires. A further aspect is a method for preparing silicon nanostructures on a silica-containing glass substrate. The method includes providing one or more metal nanoparticles on a silica-containing glass substrate and then performing reactive ion etching of the silica-containing glass substrate under conditions that are suitable for the formation of one or more silicon nanostructures.
Abstract:
A crystal is grown by the solvothermal method while causing a solvent and a given amount of a substance different in critical density from the solvent to be present in the reactor. Thus, the position in which a crystal precipitates is regulated and the yield of the crystal is improved. Furthermore, impurities are prevented from coming into the crystal to enable the crystal to have a heightened purity. The process for crystal production comprises using a solvent in a supercritical and/or subcritical state and a raw material to grow a crystal in a reactor, and is characterized in that a substance (X) which satisfies the following relationship (1) and differs in critical density from the solvent by at least 25% is caused to be present in the reactor and the amount of the substance (X) is regulated to thereby regulate the position in which crystal precipitation occurs. (solubility of raw material in substance (X))/(solubility of raw material in solvent) × 100 = 20 (1)
Abstract:
A method for etching an article containing a crystal while immersing it in an acid liquid at an etching rate higher than the crystal growth rate of the article. An article processed by the etching method is also disclosed. The etching rate is calculated by performing a preliminary etching step where the article is immersed in an acid liquid, and the etching time for which the etching is conducted is determined from the calculated etching rate. The article is immersed in the acid liquid for the determined time to perform the etching step. The etching rate is higher than the crystal growth rate of the article.
Abstract:
Crystals having a modified regular tetrahedron shape are provided. Crystals preferably have four substantially identical triangular faces that define four truncated vertices and six chamfered edges. The six chamfered edges can have an average length of l , and an average width of w , and 8 l/ w 9.5.
Abstract translation:提供具有改进的正四面体形状的晶体。 晶体优选具有四个基本相同的三角形面,其限定四个截顶和六个倒角边。 六个倒角边缘的平均长度可以为l,平均宽度为w和8.5u / l 9.5。
Abstract:
Die Erfindung betrifft eine Vorrichtung (2) zur hydrothermalen Herstellung von Quarzkristallen (3), umfassend einen Autoklav (2.1), welcher einen Innenraum (I) zur Aufnahme einer alkalischen Lösung (L), einen in einem unteren Bereich in dem Innenraum (I) angeordneten Aufnahmebereich (AB) zur Aufnahme von Quarzrohmaterial (QRM) und einen oberhalb des Aufnahmebereichs (AB) angeordneten Keimbereich (KB) aufweist, wobei innerhalb des Keimbereichs (KB) zumindest ein als Keimplatte ausgebildetes Keimelement (2.2 bis 2.13) zur Anlagerung von Quarz mittels mehrerer Halteelemente (2.14) angeordnet ist. Erfindungsgemäß sind jeweils zwei aus jeweils einem Profilelement gebildete Halteelemente (2.14) zur Halterung einer Keimplatte vorgesehen, wobei die Profilelemente an sich gegenüberliegenden Längsseiten der Keimplatte angeordnet sind und jedes Profilelement eine Nut (2.14.1) zur vollständigen Aufnahme eines seitlichen Randbereichs der jeweiligen Längsseite der Keimplatte aufweist. Die Erfindung betrifft weiterhin ein Verfahren zur hydrothermalen Herstellung von Quarzkristallen (3), ein Verfahren zur Herstellung von Quarzsand und ein Verfahren zur Herstellung von Quarzglas.
Abstract:
A synthetic diamond body and method of making the synthetic diamond body are provided. The synthetic diamond body having a low stress and free of cracks may comprise a first single crystal partial volume having the first crystallographic orientation and a one or more of other single crystal partial volumes, wherein the first partial volume occupies less than about 100% of the total volume of synthetic diamond wafer, and each other single crystal partial volume has its own crystallographic orientation; and each other single crystal partial volume comprises a plurality of single crystal volumes all having about the same crystallographic orientation, wherein the crystallographic orientation of each partial volume is fixed against the first crystallographic orientation by a geometrical operation.
Abstract:
La présente invention est relative à un procédé de préparation de couches de quartz-α épitaxiées sur substrat solide, au matériau obtenu selon ce procédé, et à ses diverses applications, notamment dans le domaine de l'électronique.