156 results about "EM - Electron microscopy" patented technology

In one aspect, the present invention relates to a microfluidic chamber. In one embodiment, the microfluidic chamber has a first sub-chamber and at least one second sub-chamber. The first sub-chamber has a first window and a second window. Both the first window and the second window are transparent to electrons of certain energies. The second window is positioned substantially parallel and opposite to the first window defining a first volume therebetween. The first window and the second window are separated by a distance that is sufficiently small such that an electron beam that enters from the first window can propagate through the first sub-chamber and exit from the second window. The at least one second sub-chamber is in fluid communication with the first sub-chamber and has a second volume that is greater than the first volume of the first sub-chamber.

The invention discloses a method for preparing gold nano-rods. The method includes the steps: adding chloroauric acid solution and optional gold seed generating regulating agents into CTAB (cetyl trimethyl ammonium bromide) solution, adding silver nitrate solution, weak reducing agents and strong reducing agents into the CTAB solution and reacting at the constant temperature of 25-40 DEG C for 5-30min to obtain reaction liquid A; and adding silver nitrate solution, optional gold nano-rod growth regulating agent solution and water into the reaction liquid A to obtain reaction liquid B, and continuing reaction to obtain the gold nano-rods. The method is simple in process and operation and fine in reproducibility, the diameter of coverage of the prepared gold nano-rods is as small as 5nm to tens of nanometers, LSPR (localized surface plasmon resonance) peak value coverage in the length direction ranges from 630nm to 1010nm, counts in a TEM (transmission electron microscopy) graph indicate that more than 90% of rod products among obtained gold nano-particle products are high in rod yield, and the ratio of an LSPR peak value to a TSPR (transverse surface plasmon resonance) peak value is not lower than 2 in a UV-Vis (ultraviolet visible) absorption spectrogram. Raw materials used in the method are widely and easily obtained, and production cost is low.

A device and method which enable a transmission electron microscope to measure electron diffraction patterns of a sample very precisely are disclosed. The patterns are suitable for structure determination. The electron beam is precessed by means of deflector coils (6) in the transmission electron microscope before the sample (4), in combination with a similar precession of the electron diffraction pattern by means of deflector coils (9) situated after the sample. The electron diffraction pattern is scanned by means of deflector coils (9) situated after the sample.

A standard sample for transmission electron microscopy (TEM) elemental mapping and a TEM elemental mapping method using the same are provided. The standard sample includes a substrate; a first crystalline thin film containing heavy atoms formed on the substrate; a first amorphous thin film having oxides or nitrides containing light atoms and having a thickness of 1-5 nm or 6-10 nm formed on the first crystalline thin film; a second crystalline thin film containing heavy atoms formed on the first amorphous thin film. The standard sample can be used to correct TEM, EDS and EELS mapping results of a multi-layered nanometer-sized thin film and to optimize mapping conditions.

According to the invention, a powder catalytic material Nd<3-x>CoxNbO7 (x being greater than or equal to 0.5 and less than or equal to 1) is prepared by adopting a supercritical hydrosynthesis method and a chemical vapor condensation and deposition method; a composite porous nanometer catalytic material Nd<3-x>CoxNbO7 (x being greater than or equal to 0.5 and less than or equal to 1) -zincosilicate molecular sieve is prepared by adopting an impregnating and baking method; and a novel photoelectrode Nd<3-x>CoxNbO7 (x being greater than or equal to 0.5 and less than or equal to 1) is prepared. The three novel materials are represented: tissue morphology analysis is performed by a transmission electron microscopy, and results show that catalyst particles are irregular in shape, with the average particle size of 150 nm; phase analysis is performed by an X-ray diffractometer, and results show that Nd2CoNbO7 has a single phase, and relatively high crystallinity; the chemical speciation of the surface of the catalyst and the elementary composition of a microcell as well as the structural characteristics of an electronic shell are discussed by an X-ray photoelectron spectroscopy; and a characteristic absorption edge of the Nd2CoNbO7 is determined by a UV-Vis diffuse reflection spectroscopy to obtain the band gap width of the Nd2CoNbO7 which is 2.412 eV. Finally, the catalyst is used for decomposing water to produce hydrogen, and carrying out catalytic degradation on organic pollutants such as microcystic toxins, methylene blue and sulfamethoxazole in a water body under visible light. Experimental results show that the catalyst prepared according to the invention is good in catalytic effect.

A method of preparing a transmission electron microscopy (TEM) sample from a semiconductor structure may include milling a region of the semiconductor structure with a focused ion beam and generating the transmission electron microscopy (TEM) sample. The focused ion beam providing the milling may include a rotation angle relative to the crystallographic axis of the semiconductor structure. A transmission electron microscopy image of a cross-sectional plane of the generated transmission electron microscopy (TEM) sample may be generated using a transmission electron microscope, whereby the transmission electron microscopy image of the cross-sectional plane includes an image projection-free region based on the rotation angle.

A method for preparing a sample includes separating a portion of substrate from a sample, performing focused ion beam milling, and removing additional sample material using an etchant.

The invention discloses a preparation method of nano pesticide carboxymethyl-beta-cyclodextrin-Fe3O4-magnetic nano-diuron, the nano pesticide is a clathrate compound prepared from carboxymethyl-beta-cyclodextrin-Fe3O4-magnetic nanoparticles as a subject and object diuron by Van der Waals force, electrostatic attraction and the like. Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) show that carboxymethyl-beta-cyclodextrin is successfully grafted onto the surface of the Fe3O4 magnetic nanoparticles. Transmission electron microscopy analysis shows that the average particle size of the nano pesticide is 25 nm. The adsorption of the carboxymethyl-beta-cyclodextrin-Fe3O4-magnetic nanoparticles on the diuron is in line with the Langmuir isothermal adsorption curve. The new pesticide is good in water solubility and good in biocompatibility, has a slow release function, improves the pesticide utilization rate, extends pesticide efficacy preserving period, reduces the application amount and frequency, can be recycled, and reduces the harm of the pesticide on the environment.

A powder batch is described comprising single crystal metal-containing particles having a crystal size of less than 50nm as measured by X-ray diffraction and having a weight average particle size of from about 10 nanometers to less than 100 nanometers as measured by transmission electron microscopy and including a continuous or non-continuous coating of a ceramic material. The powder batch is preferably produced by flame spraying.