公开(公告)号：US09214680B2

公开(公告)日：2015-12-15

申请号：US12224197

申请日：2007-02-24

Applicant: Yan Yushan ,  Zhongwei Chen

Inventor： Yan Yushan ,  Zhongwei Chen

IPC: B01J23/56 ,  H01M4/92 ,  C22C5/04 ,  H01M4/88 ,  H01M8/10

CPC classification number: H01M4/92 ,  C22C5/04 ,  H01M4/8814 ,  H01M4/921 ,  H01M4/928 ,  H01M2008/1095 ,  Y02E60/50 ,  Y02E60/523

Abstract: Electrocatalyst durability has been recently recognized as one of the most important issues that have to be addressed before the commercialization of the proton exchange membrane fuel cells (PEMFCs). The present invention is directed to a new class of cathode catalysts based on supportless platinum nanotubes (PtNTs) and platinum alloy nanotubes, for example, platinum-palladium nanotubes (PtPdNTs), that have remarkable durability and high catalytic activity. Due to their unique combination of dimensions at multiple length scales, the platinum nanotubes of the present invention can provide high platinum surface area due to their nanometer-sized wall thickness, and have the potential to eliminate or alleviate most of the degradation pathways of the commercial carbon supported platinum catalyst (Pt/C) and unsupported platinum-black (PtB) as a result of their micrometer-sized length. The platinum nanotube catalysts of the present invention asymptotically approach a maximum of about twenty percent platinum surface area loss in durability test, while the commercial PtB and Pt/C catalysts lose about fifty-one percent and ninety percent of their initial surface area, respectively. Moreover, the PtNT and PtPdNT catalysts of the present invention show higher mass activity and much higher specific activity than commercial Pt/C and PtB catalysts.

Abstract translation: 电催化剂耐久性最近被认为是在质子交换膜燃料电池（PEMFC）商业化之前必须解决的最重要的问题之一。 本发明涉及一类新型的基于无支撑铂纳米管（PtNTs）和铂合金纳米管（例如铂 - 钯纳米管（PtPdNTs））的阴极催化剂，其具有显着的耐久性和高催化活性。 由于它们在多个长度尺度上的独特的尺寸组合，本发明的铂纳米管由于其纳米尺寸的壁厚可以提供高的铂表面积，并且具有消除或减轻商业的大部分降解途径的潜力 碳负载的铂催化剂（Pt / C）和无支撑的铂黑（PtB），由于其微米尺寸的长度。 本发明的铂纳米管催化剂在耐久性试验中渐近地接近约百分之二十的铂表面积损失，而商业PtB和Pt / C催化剂分别损失其初始表面积的百分之五十一和百分之九十。 此外，本发明的PtNT和PtPdNT催化剂显示比商业Pt / C和PtB催化剂更高的质量活性和更高的比活性。

公开(公告)号：US20090220835A1

公开(公告)日：2009-09-03

申请号：US12224197

申请日：2007-02-24

Applicant: Yan Yushan ,  Zhongwei Chen

Inventor： Yan Yushan ,  Zhongwei Chen

IPC: H01M8/10 ,  H01M4/88

CPC classification number: H01M4/92 ,  C22C5/04 ,  H01M4/8814 ,  H01M4/921 ,  H01M4/928 ,  H01M2008/1095 ,  Y02E60/50 ,  Y02E60/523

Abstract: Electrocatalyst durability has been recently recognized as one of the most important issues that have to be addressed before the commercialization of the proton exchange membrane fuel cells (PEMFCs). The present invention is directed to a new class of cathode catalysts based on supportless platinum nanotubes (PtNTs) and platinum alloy nanotubes, for example, platinum-palladium nanotubes (PtPdNTs), that have remarkable durability and high catalytic activity. Due to their unique combination of dimensions at multiple length scales, the platinum nanotubes of the present invention can provide high platinum surface area due to their nanometer-sized wall thickness, and have the potential to eliminate or alleviate most of the degradation pathways of the commercial carbon supported platinum catalyst (Pt/C) and unsupported platinum-black (PtB) as a result of their micrometer-sized length. The platinum nanotube catalysts of the present invention asymptotically approach a maximum of about twenty percent platinum surface area loss in durability test, while the commercial PtB and Pt/C catalysts lose about fifty-one percent and ninety percent of their initial surface area, respectively. Moreover, the PtNT and PtPdNT catalysts of the present invention show higher mass activity and much higher specific activity than commercial Pt/C and PtB catalysts.

Abstract translation: 电催化剂耐久性最近被认为是在质子交换膜燃料电池（PEMFC）商业化之前必须解决的最重要的问题之一。 本发明涉及一类新型的基于无支撑铂纳米管（PtNTs）和铂合金纳米管（例如铂 - 钯纳米管（PtPdNTs））的阴极催化剂，其具有显着的耐久性和高催化活性。 由于它们在多个长度尺度上的独特的尺寸组合，本发明的铂纳米管由于其纳米尺寸的壁厚可以提供高的铂表面积，并且具有消除或减轻商业的大部分降解途径的潜力 碳负载的铂催化剂（Pt / C）和无支撑的铂黑（PtB），由于其微米尺寸的长度。 本发明的铂纳米管催化剂在耐久性试验中渐近地接近约百分之二十的铂表面积损失，而商业PtB和Pt / C催化剂分别损失其初始表面积的百分之五十一和百分之九十。 此外，本发明的PtNT和PtPdNT催化剂显示比商业Pt / C和PtB催化剂更高的质量活性和更高的比活性。

公开(公告)号：US11328898B2

公开(公告)日：2022-05-10

申请号：US17305514

申请日：2021-07-08

Applicant: Zhongwei Chen ,  Xiaoming Chen ,  Daniel Tang ,  Liang-Fu Fan

Inventor： Zhongwei Chen ,  Xiaoming Chen ,  Daniel Tang ,  Liang-Fu Fan

IPC: H01J37/244 ,  H01J37/28 ,  H01J37/22

Abstract: The present invention provides a digital high-resolution detector for detecting X-ray, UV light or charged particles. In various embodiments, the digital detector comprises an array of CMOS or CCD pixels and a layer of conversion material on top of the array designed for converting incident X-ray, UV light or charged particles into photons for CMOS or CCD sensors to capture. The thin and high-resolution detector of the invention is particularly useful for monitoring and aligning beams in, and optimizing system performance of, an apparatus of charged-particle beam e.g. an electron microscope.

公开(公告)号：US20220108443A1

公开(公告)日：2022-04-07

申请号：US17452999

申请日：2021-10-31

Applicant: Zhongwei Chen ,  Xiaoming Chen ,  Daniel Tang ,  Liang-Fu Fan

Inventor： Zhongwei Chen ,  Xiaoming Chen ,  Daniel Tang ,  Liang-Fu Fan

IPC: G06T7/00 ,  G06T7/50 ,  H01J37/28

Abstract: A rapid and automatic virus imaging and analysis system includes (i) electron optical sub-systems (EOSs), each of which has a large field of view (FOV) and is capable of instant magnification switching for rapidly scanning a virus sample; (ii) sample management sub-systems (SMSs), each of which automatically loads virus samples into one of the EOSs for virus sample scanning and then unloads the virus samples from the EOS after the virus sample scanning is completed; (iii) virus detection and classification sub-systems (VDCSs), each of which automatically detects and classifies a virus based on images from the EOS virus sample scanning; and (iv) a cloud-based collaboration sub-system for analyzing the virus sample scanning images, storing images from the EOS virus sample scanning, and storing and analyzing machine data associated with the EOSs, the SMSs, and the VDCSs.

公开(公告)号：US20160351371A1

公开(公告)日：2016-12-01

申请号：US14940102

申请日：2015-11-12

Applicant: Shuai Li ,  Wei He ,  Zhongwei Chen

Inventor： Shuai Li ,  Wei He ,  Zhongwei Chen

IPC: H01J37/145 ,  H01J37/28 ,  H01J37/21 ,  H01J37/147

CPC classification number: H01J37/145 ,  H01J37/1477 ,  H01J37/21 ,  H01J37/28 ,  H01J2237/0473 ,  H01J2237/2802

Abstract: The present invention provides a scanning transmission electron microscope (STEM). In the STEM, a specimen is sandwiched between a variable axis objective lens and a variable axis collection lens. The axis of the collection lens varies along with the variation of the objective lens axis in a coordinated manner. The STEM of the invention exhibits technical merits such as large scanning field, high image resolution across the entire scanning field, and high throughput, among others.

Abstract translation: 本发明提供扫描透射电子显微镜（STEM）。 在STEM中，将样本夹在可变轴物镜和可变轴收集透镜之间。 收集透镜的轴线随着物镜轴的协调变化而变化。 本发明的STEM具有如扫描场大，整个扫描场的高图像分辨率，高通量等技术优点。

公开(公告)号：US20160322645A1

公开(公告)日：2016-11-03

申请号：US15106222

申请日：2014-12-17

Applicant: Zhongwei Chen ,  Dong Un Lee

Inventor： Zhongwei Chen ,  Dong Un Lee

IPC: H01M4/90 ,  H01M12/08 ,  H01M12/06 ,  H01M4/86 ,  H01M4/88

CPC classification number: H01M4/9016 ,  C25B11/035 ,  H01M4/8615 ,  H01M4/8652 ,  H01M4/8668 ,  H01M4/8673 ,  H01M4/8828 ,  H01M4/8896 ,  H01M12/06 ,  H01M12/08 ,  H01M2004/8689 ,  Y02E60/128

Abstract: A single layer air electrode comprising a porous active catalyst framework. The porous active catalyst framework comprises metallic macroparticles, an active catalyst, a substrate and a binder. The porous active catalyst framework acting as both the active catalyst layer and the gas diffusion layer.

Abstract translation: 包含多孔活性催化剂骨架的单层空气电极。 多孔活性催化剂骨架包括金属大颗粒，活性催化剂，底物和粘合剂。 用作活性催化剂层和气体扩散层的多孔活性催化剂骨架。

公开(公告)号：US20150338316A1

公开(公告)日：2015-11-26

申请号：US14284328

申请日：2014-05-21

Applicant: Zhongwei Chen

Inventor： Zhongwei Chen

IPC: G01N1/06 ,  G01N1/28 ,  B26D7/18

CPC classification number: G01N1/06 ,  B26D7/1845 ,  G01N1/286 ,  G01N2001/061 ,  G01N2001/063 ,  G01N2001/066 ,  G01N2001/2873 ,  Y10T83/0448 ,  Y10T83/0453 ,  Y10T83/2066 ,  Y10T83/2096

Abstract: Provided is a microtomic system and process for the preparation of sections for microscope examination. A cutting edge in the system can cut through a sample block and produce a section one end of which remains attached to the cutting edge. A voltage generator can generate a voltage and apply the voltage between the cutting edge and a section receiver such as a semiconductor chip grid. Through electrostatic force caused by the voltage, another end of the section can anchor to the section receiver. The section is then spread on the receiver. The system is automatable, highly efficient, and does not need liquid to float sample sections, and can therefore maintain the integration of the sample sections.

Abstract translation: 提供了用于制备用于显微镜检查的切片的显微镜系统和方法。 系统中的切割边缘可以切割出样品块，并产生其一端保持附着到切割边缘的部分。 电压发生器可以产生电压并且在切割边缘和诸如半导体芯片格栅之类的部分接收器之间施加电压。 通过由电压引起的静电力，该部分的另一端可以锚定到部分接收器。 然后将该部分扩展到接收器。 该系统是可自动化的，高效率的，并且不需要液体漂浮样品部分，因此可以保持样品部分的整合。

公开(公告)号：US09184024B2

公开(公告)日：2015-11-10

申请号：US13012710

申请日：2011-01-24

Applicant: Zhongwei Chen

Inventor： Zhongwei Chen

IPC: H01J37/09 ,  H01J37/15 ,  H01J37/28

CPC classification number: H01J37/28 ,  H01J37/09 ,  H01J37/15 ,  H01J2237/0453 ,  H01J2237/0458

Abstract: A selectable Coulomb aperture in charged particle system comprises a non-magnetic conductive plate with a plurality of holes therein. The plurality of holes has variant sizes or diameters to select different beam currents of primary beam in the charged particle system. The charged particle system may include a charged particle source for emitting a primary beam, a condenser lens for receiving the primary beam and condensing the primary beam, an objective lens for receiving the primary beam and focusing the primary beam on a surface of a specimen. The selectable Coulomb aperture is positioned between the charged particle source and the condenser lens.

Abstract translation: 带电粒子系统中的可选择的库仑孔径包括其中具有多个孔的非磁性导电板。 多个孔具有不同的尺寸或直径，以在带电粒子系统中选择主波束的不同束流。 带电粒子系统可以包括用于发射主光束的带电粒子源，用于接收主光束并聚光主光束的聚光透镜，用于接收主光束并将主光束聚焦在样本表面上的物镜。 可选择的库仑孔位于带电粒子源和聚光透镜之间。

公开(公告)号：US08592761B2

公开(公告)日：2013-11-26

申请号：US13551947

申请日：2012-07-18

Applicant: Weiming Ren ,  Zhongwei Chen

Inventor： Weiming Ren ,  Zhongwei Chen

IPC: G21K1/08 ,  H01J37/26 ,  H01J37/20

CPC classification number: H01J37/05 ,  H01J37/21 ,  H01J37/28 ,  H01J2237/057 ,  H01J2237/1508 ,  H01J2237/1532

Abstract: The monochromator for reducing energy spread of a primary charged particle beam in charged particle apparatus comprises a beam adjustment element, two Wien-filter type dispersion units and an energy-limit aperture. In the monochromator, a dual proportional-symmetry in deflection dispersion and fundamental trajectory along a straight optical axis is formed, which not only fundamentally avoids incurring off-axis aberrations that actually can not be compensated but also ensures the exit beam have a virtual crossover which is stigmatic, dispersion-free and inside the monochromator. The present invention also provides two ways to build a monochromator into a SEM, in which one is to locate a monochromator between the electron source and the condenser, and another is to locate a monochromator between the beam-limit aperture and the objective. The former provides an additional energy-angle depending filtering, and obtains a smaller effective energy spread.

Abstract translation: 用于减少带电粒子装置中的初级带电粒子束的能量扩散的单色仪包括光束调节元件，两个维恩滤波器型色散单元和能量限制孔径。 在单色仪中，形成了沿着直线光轴的偏转色散和基本轨迹中的双比例对称性，其不仅从根本上避免了实际上不能被补偿的偏轴像差，而且确保出射光束具有虚拟交叉， 是单色的，是无色的，不分​​散的。 本发明还提供了将单色仪构建到SEM中的两种方法，其中一种是在电子源和电容器之间定位单色器，另一种是在光束极限孔径和物镜之间定位单色仪。 前者提供额外的能量角取决于滤波，并获得较小的有效能量扩展。

公开(公告)号：US20130112889A1

公开(公告)日：2013-05-09

申请号：US13292455

申请日：2011-11-09

Applicant: Zhongwei Chen ,  Xuedong Liu ,  Weiming Ren

Inventor： Zhongwei Chen ,  Xuedong Liu ,  Weiming Ren

IPC: H01J3/26

CPC classification number: H01J37/05 ,  H01J49/288 ,  H01J2237/057

Abstract: This invention provides a multi-pole type Wien filter, which acts more purely approaching its fundamentally expected performance. A 12-electrode electric device acts as an electric deflector,or acts as an electric deflector and an electric stigmator together. A cylindrical 4-coil magnetic device with a magnetic core acts as a magnetic deflector. Both can produce a dipole field while only incurring a negligibly-small 3rd order field harmonic. The magnetic core enhances the strength and more preciously regulates the distribution of the magnetic field originally generated by the coils. Then two ways to construct a Wien filter are proposed. One way is based on both of the foregoing electric and magnetic devices, and the other way is based on the foregoing electric device and a conventional magnetic deflector. The astigmatism in each of such Wien filters can be compensated by the electric stigmator of the electric device.

Abstract translation: 本发明提供了一种多极型Wien滤波器，其更加纯粹地接近其根本预期的性能。 12电极电气装置用作电导向器，或者用作电导向器和电极连接器。 具有磁芯的圆柱形4线圈磁性装置用作磁导流器。 两者都可以产生偶极场，同时只产生一个可忽略的小三阶场谐波。 磁芯增强了强度，更加珍贵地调节了最初由线圈产生的磁场的分布。 然后提出构建维恩滤波器的两种方法。 一种方法是基于上述电气和磁性装置两者，另一种方法是基于前述的电气装置和常规的磁导向装置。 每个这样的维恩滤波器中的像散可以通过电气设备的电极来补偿。