1113 results about "Transmission electron microscopy" patented technology

Provided is a magnetic tape in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes ferromagnetic hexagonal ferrite powder and an abrasive, a percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 μm×6.3 μm of the surface of the magnetic layer by plane observation using a scanning electron microscope, with respect to the total area of the region is equal to or greater than 0.02% and less than 0.06%, and a tilt cos 0 of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.

The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic support, in which the total thickness of the magnetic tape is equal to or smaller than 5.30 μm, the magnetic layer includes a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.

The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.

It is an object of the invention to provide a curable resin composition excellent in mechanical strength, heat resistance, moisture resistance, flexibility, resistance to thermal cycles, resistance to solder reflow, dimensional stability, and the like after curing and providing high adhesion reliability and conduction reliability and an adhesive epoxy resin paste, an adhesive epoxy resin sheet, a conductive connection paste, and a conductive connection sheet using the curable resin composition, and an electronic component joined body. The invention relates to a curable resin composition, which contains an epoxy resin, a solid polymer having a functional group to react with the epoxy group and a curing agent for an epoxy resin, no phase separation structure being observed in a matrix of a resin when a cured product is dyed with a heavy metal and observed with a transmission electron microscope.

A method for providing an anhydrous route for the synthesis of amine capped coinage-metal (copper, silver, and gold) nanoparticles (NPs) using the coinage-metal mesityl (mesityl=C₆H₂(CH₃)₃-2,4,6) derivatives. In this method, a solution of (Cu(C₆H₂(CH₃)₃)₅, (Ag(C₆H₂(CH₃)₃)₄, or (Au(C₆H₂(CH₃)₃)₅ is dissolved in a coordinating solvent, such as a primary, secondary, or tertiary amine; primary, secondary, or tertiary phosphine, or alkyl thiol, to produce a mesityl precursor solution. This solution is subsequently injected into an organic solvent that is heated to a temperature greater than approximately 100° C. After washing with an organic solvent, such as an alcohol (including methanol, ethanol, propanol, and higher molecular-weight alcohols), oxide free coinage NP are prepared that could be extracted with a solvent, such as an aromatic solvent (including, for example, toluene, benzene, and pyridine) or an alkane (including, for example, pentane, hexane, and heptane). Characterization by UV-Vis spectroscopy and transmission electron microscopy showed that the NPs were approximately 9.2±2.3 nm in size for Cu°, (no surface oxide present), approximately 8.5±1.1 nm Ag° spheres, and approximately 8–80 nm for Au°.

Sample preparation apparatus and method includes a wafer stage platform with an optical microscope and integrated pattern recognition to automatically address specific locations on the wafer sample of interest. A laser attaches to the optical microscope to mill a set pattern around the area of interest. A precision micro-manipulator engages the sample support structure, extracts the structure, and places the structure in a TEM holder or holder tip. The holder or holder tip can then be placed inside a FIB for final thinning, followed by direct transfer into the TEM.

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.

An aggregate of carbon nanotubes satisfying all of the following requirements (1) to (3):

• (1) the volume resistivity is from 1×10⁻⁵ Ω·cm to 5×10⁻³ Ω·cm;
• (2) at least 50 out of 100 carbon nanotubes are double-walled carbon nanotubes in observation by a transmission electron microscope; and
• (3) the weight loss from 200° C. to 400° C. in thermogravimetry at a temperature rise of 10° C./min is from 5% to 20%.

A device and method for fabricating a device holder for use with a standard holder body of a transmission electron microscope for use with in situ microscopy of both static and dynamic mechanisms. One or more electrical contact fingers is disposed between a baseplate and a frame, with a MEMS device making contact with the electrical contact fingers. A connector is provided to matingly engage the transmission electron microscope and the device holder to couple the device holder to the transmission electron microscope. Once clamped between the baseplate and frame, the electrical contact fingers may be separated from the template.

A transmission electron microscope (TEM) micro-grid includes a metallic grid and a carbon nanotube film structure covered thereon. A method for making a TEM micro-grid includes the steps of: (a) providing an array of carbon nanotubes, quite suitably, providing a super-aligned array of carbon nanotubes; (b) drawing a carbon nanotube film from the array of carbon nanotubes; (c) covering the carbon nanotube film on a metallic grid, and treating the carbon nanotube film and the metallic grid with an organic solvent.

The invention discloses a method for preparing a transmission electron microscope sample. The method comprises the following steps of: providing a sample with length, width and thickness, wherein at least one elongation structure or multi-layer stack structure along the thickness direction is formed in a region to be observed of the sample; marking the region to be observed of the sample; grinding the sample along a direction which is perpendicular to the elongation direction of the elongation structure or the stacking direction of the stack structure until the mark is exposed; forming a concave pit on the two sides of the region to be observed on a grinding surface respectively; thinning the sample part of the marked region along the concave pit to a specific thickness; and separating and taking the thinned sample part at the region to be observed out. By the method, the preparation efficiency and the observation effect are improved, a protective cover is further assembled on the surface of the sample during the preparation, the sample is prevented from being damaged during the grinding, and the problem that the sample at the region to be observed can easily fall off and bounce out after the preparation is finished is also prevented.

The present invention relates to a transmission electron microscope grid including graphene sheet-carbon nanotube film composite. The graphene sheet-carbon nanotube film composite structure includes at least one carbon nanotube film structure and at least one graphene sheet. The carbon nanotube film structure includes at least one pore. The pore is covered by the graphene sheet.

A toner suitable for use in electrophotography, etc., is composed of toner particles each containing a binder resin, a colorant and a wax component. Each toner particle has such a microtexture as to provide a cross section as observed through a transmission electron microscope (TEM) exhibiting a matrix of the binder resin, a particle of the wax enclosed with the matrix; and the binder resin dispersed in a particulate form in the wax particle, and the toner particles have a residual monomer content of at most 500 ppm by weight of the toner particles. The colorant may also be dispersed in the wax particle enclosed within the matrix of the binder resin.

In the type of scanning transmission electron microscopes carrying an aberration corrector, a method of assuring more simplified and manipulatable adjustment of the corrector and a scanning transmission electron microscope having that function are provided. A Ronchigram image is acquired using a spherical standard specimen and parameters necessary for the adjustment are acquired from the thus obtained Ronchigram.

A method for making transmission electron microscope gird is provided. An array of carbon nanotubes is provided and drawing a carbon nanotube film from the array of carbon nanotubes. A substrate has a plurality of spaced metal girds attached on the substrate. The metal girds are covered with the carbon nanotube film and treating the carbon nanotube film and the metal girds with organic solvent. A transmission electron microscope (TEM) grid is obtained by removing remaining CNT film.

The invention relates to a method for preparing a graphene-based titanium dioxide composite photocatalyst by radiation of electron beams, belonging to the technical fields of radiation chemistry and photocatalyst preparation. The method comprises the following steps: firstly, preparing graphene by the prior art, then adding the graphene powder into a titanium tetrafluoride solution, and dispersingthe graphene powder with ultrasonic waves to obtain a suspension; then putting the suspension in an electron beam generating device to be radiated by a certain dose of electron beams, the irradiationdose of which is 70-280KGy; after sealing, putting the suspension in an oven of 60 DEG C for reaction for 20 hours; and finally, obtaining the graphene-based titanium dioxide composite photocatalystby washing and drying. The inspection proves that the graphene-based titanium dioxide composite photocatalyst prepared by the method of the invention has higher photocatalytic activity. In addition, by inspecting with a transmission electron microscope (TEM), titanium dioxide crystals which are densely and evenly loaded on the graphene matrix can be seen.

A confocal scanning transmission electron microscope which includes an electron illumination device providing an incident electron beam propagating in a direction defining a propagation axis, and a precision specimen scanning stage positioned along the propagation axis and movable in at least one direction transverse to the propagation axis. The precision specimen scanning stage is configured for positioning a specimen relative to the incident electron beam. A projector lens receives a transmitted electron beam transmitted through at least part of the specimen and focuses this transmitted beam onto an image plane, where the transmitted beam results from the specimen being illuminated by the incident electron beam. A detection system is placed approximately in the image plane.

A preferred method for transmission electron microscopy includes a step of generating a microscopy signal. The microscopy signal is then detected with an active pixel detector that includes a plurality of pixels. Each of the pixels includes at least one photodiode. Each pixel integrates an incident signal over a collection time period. Using a massibel parallel on chip analog to digital conversion, very fast read out times can be achieved, e.g., many frames per second. In a preferred embodiment, the read out time permits there to be a single electron event recorded per pixel, indicating either a single electron or the lack thereof. This permits simple accumulation of the pixel counts for each pixel in read-out and storage electronics.

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.