Nanodiamonds are grown under conditions where diamond-like organic seed molecules do not decompose. This permits engineered growth of fluorescent nanodiamonds wherein a custom designed seed molecule can be incorporated at the center of a nanodiamond. By substituting atoms at particular locations in the seed molecule it is possible to achieve complex multi-atom diamond color centers or even to engineer complete quantum registers. In addition, it is possible to grow ultra-small nanodiamonds, wherein each nanodiamond, no matter how small, can have at least one bright and photostable fluorescent emitter.

Disclosed herein is an apparatus and method for growing a diamond. The apparatus for growing a diamond comprises: a reaction cell that is configured to grow the diamond therein; a main heater including a main heating surface that is arranged along a first inner surface of the reaction cell; and a sub-heater including a sub-heating surface that is arranged along a second inner surface of the reaction cell, the second inner surface being non-parallel with the first inner surface.

The invention relates to a multi-chamber with ultra-high-pressure or hydraulic motor compressors or motor pumps for compressing gas or liquid at ultra-high pressure, formed by several different-sized concentric chambers, wherein each chamber contains smaller chambers, there being installed between the chambers motors or pumps that enable fluid to be introduced into the inner chambers at increasingly greater pressure.

A high-temperature, high-pressure (HTHP) press is provided having a plurality of press bases. In one embodiment, the press includes eight or more press bases arranged in one of an octahedral, a dodecahedral or an icosahedral geometry. The press bases may include, or be coupled with, anvils configured to converge on a central region. An octahedral, a dodecahedral or an icosahedral reaction cell may be positioned at the central region for pressing by the converging anvils. In one embodiment, the reaction cell may include an opening, such as a through-hole, extending from a first face of the reaction cell to a second, opposite face of the reaction cell. One or more canisters containing materials to be sintered may be disposed in the opening to be subjected to a HTHP process.

Nanodiamonds are grown under conditions where diamond-like organic seed molecules do not decompose. This permits engineered growth of fluorescent nanodiamonds wherein a custom designed seed molecule can be incorporated at the center of a nanodiamond. By substituting atoms at particular locations in the seed molecule it is possible to achieve complex multi-atom diamond color centers or even to engineer complete quantum registers. In addition, it is possible to grow ultra-small nanodiamonds, wherein each nanodiamond, no matter how small, can have at least one bright and photostable fluorescent emitter.

The invention relates to a method for obtaining synthetic diamonds from sucrose, and to a device for carrying out said method, the method comprising: introducing sucrose or a solution of water and sucrose into a hermetic capsule without air, which is surrounded by an external container that keeps the volume of the capsule constant during the entire process; increasing the pressure inside the capsule by breaking down the sucrose inside the capsule, either by increasing the temperature or by combining the sucrose with sulfuric acid, until the carbon resulting from said pressure conditions of the capsule is transformed into diamond; and controlling the pressure generated inside the capsule, using containing means that apply pressure externally around the container of the capsule. In addition, extra carbon is added, increasing the dimensions of the diamond.

A device (1) for generating high pressures in solid and liquid media is described. The device (1) includes a lower shell-shaped body half (2) and an upper shell-shaped body half (3). The device (1) further includes a lower elastic membrane (6) and an upper elastic membrane (7), which are each inserted into the lower body half (2) and into the upper body half (3), respectively. The respective body half (2, 3) and the respective membrane (6, 7) inserted into it each surround a pressure chamber (62, 73). The device (1) furthermore includes an opening and a channel (14) in the lower body half (2), in order to attach an oil line from an oil pump to the device and to pump the oil into the pressure chamber between the lower body half (2) and the elastic membrane (6) inserted into it. The pressure chambers (62, 73) in the lower body half (2) and in the upper body half (3) communicate by means of a line. The device (1) is distinguished in that the line connects the pressure chambers (62, 73) in the lower body half (2) and the upper body half (3) permanently with one another in both the open and the closed state of the device. The device is furthermore distinguished in that it includes a pipeline, which is embodied in the form of a helical spring line (17) and extends outside the lower shell-shaped body half (2) and the upper shell-shaped body half (3).

Methods of forming polycrystalline diamond compacts include employing field assisted sintering techniques with high temperature and high pressure sintering techniques. For example, a particle mixture that includes diamond particles may be sintered by subjecting the particle mixture to a high temperature and high pressure sintering cycle, and pulsing direct electrical current through the particle mixture during at least a portion of the high temperature and high pressure sintering cycle. The polycrystalline diamond compacts may be used to form cutting elements for earth-boring tools. Sintering systems are configured to perform such sintering processes.

A high-pressure pump comprising an elongated casing and a hollow interior formed along a central axis thereof. At least one partition may be axially fixed within the elongated casing such that it divides the hollow interior. First and second pressure differential devices may be disposed on opposite sides of the at least one partition and each have a rotary shaft extending there through. A first rotary shaft extending through the first pressure differential device may be axially fixed by the at least one partition and rotationally fixed to a second rotary shaft extending through the second pressure differential device. The high-pressure pump may be driven by a servomotor and used in a high-pressure press.

A container assembly for use in a high-pressure press having a central pressure cell and a method of sealing a central pressure cell. The container assembly includes a container that receives a sample to be pressed, and a gasket distinct from the container, the gasket meeting the container at an interface. The container and the gasket are dimensioned to locate the interface within the central pressure cell.