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公开(公告)号：US20250043623A1
公开(公告)日：2025-02-06
申请号：US18921396
申请日：2024-10-21
Applicant: KENT STATE UNIVERSITY
Inventor： Yingfei JIANG , Deng-Ke YANG , Yunho SHIN
Abstract: A dual-mode switchable liquid-crystal window can control both radiant energy flow and privacy. The modes are selected by using different voltage frequencies. A dichroic dye is doped to enable modulation of transmission of the window. In the absence of an applied voltage, the window is transparent without haze. When a high-frequency (e.g., 1 kHz) voltage is applied, the liquid crystal and doped dye molecules inside the window reorient uniformly under dielectric interactions. The material becomes optically absorbing. The transmittance decreases, but the haze does not change. In this mode, the window can control radiant energy flow through the window. When a low-frequency (50 Hz) voltage is applied, the liquid crystal and doped dye molecules are switched into a micron-sized polydomain structure under flexoelectric interactions. The material becomes optically scattering and absorbing. The scenery behind the window is blocked. In this mode, privacy can be controlled. This dual-mode switchable window is suitable for architectural and automobile windows.
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2.发明公开公开(公告)号：US20240176141A1
公开(公告)日：2024-05-30
申请号：US18519643
申请日：2023-11-27
Applicant: KENT STATE UNIVERSITY
Inventor： Fenglin Xi , Philip Bos , Hsien-Hui Cheng , Lu Lu
CPC classification number: G02B27/0103 , G02B27/0179 , G02B27/1006 , G02B2027/0187
Abstract: An optical combiner includes first, second, and third polarization volume holograms (PVHs) configured to deflect light of a first color, a second color, and a third color, respectively. The optical combiner further includes a first polarization interference filter (PIF) configured to switch light of the first color from a polarization that is not deflected by the first PVH to a polarization that is deflected by the first PVH. The optical combiner may further include a second PIF configured to switch light of the second color from a polarization that is not deflected by the second PVH to a polarization that is deflected by the second PVH. The optical combiner may further include a third PIF configured to switch light of the third color from a polarization that is not deflected by the third PVH to a polarization that is deflected by the third PVH.
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公开(公告)号：US20230399889A1
公开(公告)日：2023-12-14
申请号：US18034714
申请日：2021-11-01
Applicant: KENT STATE UNIVERSITY
Inventor： Yingfei JIANG , Deng-Ke YANG , Yunho SHIN
CPC classification number: E06B9/24 , G02F1/13712 , G02F1/13737 , G02F2202/043 , E06B2009/2464
Abstract: A dual-mode switchable liquid-crystal window can control both radiant energy flow and privacy. The modes are selected by using different voltage frequencies. A dichroic dye is doped to enable modulation of transmission of the window. In the absence of an applied voltage, the window is transparent without haze. When a high-frequency (e.g., 1 kHz) voltage is applied, the liquid crystal and doped dye molecules inside the window reorient uniformly under dielectric interactions. The material becomes optically absorbing. The transmittance decreases, but the haze does not change. In this mode, the window can control radiant energy flow through the window. When a low-frequency (50 Hz) voltage is applied, the liquid crystal and doped dye molecules are switched into a micron-sized polydomain structure under flexoelectric interactions. The material becomes optically scattering and absorbing. The scenery behind the window is blocked. In this mode, privacy can be controlled. This dual-mode switchable window is suitable for architectural and automobile windows.
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公开(公告)号：US11814563B2
公开(公告)日：2023-11-14
申请号：US17299777
申请日：2019-12-06
Applicant: Zymergen Inc. , Kent State University
Inventor： Adam Safir , Shilpa Naresh Raja , Arjan Zoombelt , Robert J. Twieg , Pawan Nepal , Ashani Wedige-Fernando , Peter Palffy-Muhoray
IPC: C09K19/58
CPC classification number: C09K19/588
Abstract: The disclosure discusses chiral dopants for liquid-crystalline materials. Chiral dopants can be bioreachable compounds, i.e. compounds produced from microbes through fermentation. Chiral dopants can also include bioreachable materials that are further modified by chemical synthetic steps. Chiral dopants as discussed herein can include biomolecules such as glycyrrhetinic acid (1), S-naringenin (2), shikimic acid (3), alpha-phellandrene (4), betulin (5), malic acid (6), valencene (7), or nootkatone (8), and any stereoisomers or chemically modified derivatives thereof. The disclosure further shows optical properties of such compounds in a liquid-crystalline material.
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公开(公告)号：US20230203378A1
公开(公告)日：2023-06-29
申请号：US17928265
申请日：2021-06-04
Applicant: Zymergen Inc. , Kent State University
Inventor： Shilpa Naresh Raja , Arjan Zoombelt , Adam Safir , Peter Palffy-Muhoray , Robert J. Twieg , Hiroshi Yokoyama , Tianyi Guo , Pawan Nepal
CPC classification number: C09K19/586 , C09K19/0208 , G02F1/13 , C09K2219/03 , C09K2323/031
Abstract: The present disclosure relates to formulations having one, two, or more chiral dopants, as well as materials and methods including such formulations. In particular instances, the formulation can include an achiral host, such as a nematic substance.
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Patent Agency Ranking
公开(公告)号：US11643333B2
公开(公告)日：2023-05-09
申请号：US16658481
申请日：2019-10-21
Applicant: KENT STATE UNIVERSITY
Inventor： Mietek Jaroniec , Alexandre A. S. Goncalves
CPC classification number: C01F7/021 , B01J21/04 , B01J23/72 , B01J23/75 , B01J23/755 , B01J37/04 , B01J37/088 , C01F7/441 , C01P2006/12 , C01P2006/14
Abstract: Sintering is an important issue in creating crystalline metal oxides with high porosity and surface area, especially in the case of high-temperature materials such as metal aluminates. Herein we report a rationally designed synthesis of metal aluminates that diminishes the surface area loss due to sintering. Metal aluminate (e.g. MeAl2O4or MeAlO3−Me=Mg, Mn, Fe, Ni, Co, Cu, La, or Ce; or mixture thereof) supported on γ-Al2O3 with ultralarge mesopores (up to 30 nm) was synthesized through microwave-assisted peptization of boehmite nanoparticles and their self-assembly in the presence of a triblock copolymer (Pluronic P123) and metal nitrates, followed by co-condensation and thermal treatment. The resulting materials showed the surface area up to about 410 m2·g−1, porosity up to about 2.5 cm3·g−1, and very good thermal stability. The observed enhancement in their thermomechanical resistance is associated with the faster formation of the metal aluminate phases. The nanometer scale path diffusion and highly defective interface of γ-alumina facilitate the counter diffusion of MeX+ and Al3+ species and further formation of the metal aluminate phase.
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公开(公告)号：US11586075B2
公开(公告)日：2023-02-21
申请号：US16484218
申请日：2018-02-07
Applicant: Kent State University
Inventor： Qi-Huo Wei , Hao Yu , Yubing Guo , Miao Jiang , Oleg D. Lavrentovich
IPC: G02F1/1337 , B82Y20/00 , B82Y40/00 , C09K19/56 , G02F1/1523
Abstract: A method for aligning molecular orientations of liquid crystals and/or polymeric materials into spatially variant patterns uses metamasks. When non-polarized or circularly polarized light is transmitted through or reflected by the metamasks, spatially varied polarization direction and intensity patterns of light can be generated. By projecting the optical patterns of the metamasks onto substrates coated with photoalignment materials, spatially variant molecular orientations encoded in the polarization and intensity patterns are induced in the photoalignment materials, and transfer into the liquid crystals. Possible designs for the metamask use nanostructures of metallic materials (e.g., rectangular nanocuboids of metallic materials arrayed on a transparent substrate).
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公开(公告)号：US11378477B2
公开(公告)日：2022-07-05
申请号：US16650021
申请日：2018-09-25
Applicant: Kent State University
Inventor： Mykhailo Pevnyi , Tianyi Guo , Fred Minkowski , Vincent Hetherington , Hiroshi Yokoyama , Peter Palffy-Muhoray
Abstract: An apparatus for measuring normal and shear stress at a surface. The apparatus includes a substrate; and a plurality of sensing units on the substrate. Each sensing unit includes a mechanical transducer having a receiving surface and a sensing surface; and a plurality of normal force sensors between the sensing surface and the substrate.
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公开(公告)号：US10962840B2
公开(公告)日：2021-03-30
申请号：US16650037
申请日：2018-09-25
Applicant: Kent State University
Inventor： Hiroshi Yokoyama , Mengfei Wang
IPC: G02F1/1337 , G02B13/24
Abstract: A photoalignment method includes photoaligning a first liquid crystal cell and using the photoaligned first liquid crystal cell as a mask in the photoalignment of a second liquid crystal cell. The method may increase spatial dynamic range or decrease pitch.
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公开(公告)号：US10803121B2
公开(公告)日：2020-10-13
申请号：US15167992
申请日：2016-05-28
Applicant: GraphSQL, Inc. , Kent State University
Inventor： Ruoming Jin , Adam Anthony , Ming Lin , Nicholas Tietz
IPC: G06F16/901 , G06F16/245 , G06F16/28 , G06N5/02
Abstract: Systems and methods for generating real-time, personalized recommendations are disclosed. In one embodiment, a method operates upon an electronic data collection organized as a network of vertices and edge connections between the vertices. The method provides the recommendations includes iteratively traversing across edges that satisfy search criteria to a new set of vertices and filtering each new set of vertices to satisfy the search criteria. At the conclusion of the traversing and filtering, a final set of vertices represents the recommended entities. In some embodiments, a control vector describes a sequence of relationships between a requester and the items to be recommended. The method can assign scores to candidate recommendations and select the recommendations having the highest scores. Advantageously, the method provides flexibility and rapid execution of recommendation queries without the need to precompute intermediate results.
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