公开(公告)号：US11714075B2

公开(公告)日：2023-08-01

申请号：US17032614

申请日：2020-09-25

Applicant: Research Triangle Institute

Inventor： David S. Ensor ,  Li Han

IPC: G01N33/00 ,  G01N27/12 ,  G01N27/22

CPC classification number: G01N33/0047 ,  G01N27/127 ,  G01N27/227

Abstract: A chemical sensor and a system and method for sensing a chemical species. The chemical sensor includes a plurality of nanofibers whose electrical impedance varies upon exposure to the chemical species, a substrate supporting and electrically isolating the fibers, a set of electrodes connected to the plurality of fibers at spatially separated points to permit the electrical impedance of the plurality of fibers to be measured, and a membrane encasing the fibers and having a thickness ranging from 50 μm to 5.0 mm. The system includes the chemical sensor, an impedance measuring device coupled to the electrodes and configured to determine an electrical impedance of the plurality of fibers, and an analyzer configured to identify the chemical species based on a change in the electrical impedance.

公开(公告)号：US10767210B2

公开(公告)日：2020-09-08

申请号：US16455067

申请日：2019-06-27

Applicant: Research Triangle Institute

Inventor： David S. Ensor ,  Howard Jerome Walls ,  Karin K. Foarde ,  Susanne Vera Hering ,  Steven Russel Spielman

IPC: C12Q1/24

Abstract: An aerosol collection system and method. The system includes a bio-aerosol delivery device configured to supply bioparticles in a gas stream, a moisture exchange device including a partition member coupled to the gas stream and configured to humidify or dehumidify the bioparticles in the gas stream, and an aerosol collection medium downstream from the moisture exchange device and configured to collect the bioparticles. The method includes delivering bioparticles in a gas stream, humidifying or dehumidifying the bioparticles in the gas stream by transport of water across a partition member and into a vapor phase of the gas stream, and collecting the bioparticles by a collection medium.

公开(公告)号：US20190257737A1

公开(公告)日：2019-08-22

申请号：US16398400

申请日：2019-04-30

Applicant: Research Triangle Institute

Inventor： Anthony Clint Clayton ,  Howard Jerome Walls ,  David S. Ensor ,  Andrei Yurievich Khlystov

IPC: G01N15/14 ,  G01N21/53 ,  G01N15/06 ,  G01N15/02 ,  C12Q3/00 ,  G01N21/64

Abstract: Sample monitoring and flow control systems and methods are disclosed for monitoring of airborne particulates. A system may include a particle collection filter. The system also includes a fluid moving device for moving a sample through the particle collection filter. Further, the system includes a light source configured to direct irradiating light towards the particle collection filter. The system also includes a light detector positioned to receive the irradiating light passing through the particle collection filter and configured to generate a signal representative of an amount of the received light. Further, the system includes a controller configured to receive the signal and to control the fluid moving device based on the amount of the received light.

公开(公告)号：US08847487B2

公开(公告)日：2014-09-30

申请号：US13938754

申请日：2013-07-10

Applicant: Research Triangle Institute

Inventor： James Lynn Davis ,  Anthony L. Andrady ,  David S. Ensor ,  Li Han ,  Howard J. Walls

IPC: F21V8/00 ,  D01D5/00 ,  D04H1/42 ,  D01F11/00 ,  D06M11/52 ,  H01L33/50

CPC classification number: G02B6/0008 ,  C09K11/565 ,  C09K11/883 ,  D01D5/0007 ,  D01F11/00 ,  D04H1/413 ,  D04H1/42 ,  D04H1/4382 ,  D06M11/52 ,  H01L33/501 ,  H01L2924/0002 ,  H01L2924/00

Abstract: A device for stimulable light emission that includes a fiber mat of nanofibers having an average fiber diameter in a range between 100 and 2000 nm, and includes plural stimulable particles disposed in association with the nanofibers. The stimulable particles produce secondary light emission upon receiving primary light at a wavelength λ. The average fiber diameter is comparable in size to the wavelength λ in order to provide scattering sites within the fiber mat for the primary light. Various methods for making suitable luminescent nanofiber mats include: electrospinning a polymer solution including or not including the stimulable particles and forming from the electrospun solution nanofibers having an average fiber diameter between 100 and 2000 nm. Methods, which electrospin without the stimulable particles, introduce the stimulable particles during electrospinning or after electrospinning to the fibers and therefore to the resultant fiber mat.

Abstract translation: 一种可刺激发光的装置，其包括平均纤维直径在100和2000nm之间的纳米纤维的纤维垫，并且包括与纳米纤维相关联地设置的多个可刺激的颗粒。 可接受的颗粒在接收波长为λ的原始光时产生二次发光。 平均纤维直径在尺寸上与波长λ相当，以便为初级光提供纤维垫内的散射部位。 用于制备合适的发光纳米纤维毡的各种方法包括：将包含或不包含可刺激颗粒的聚合物溶液静电纺丝并由平均纤维直径在100和2000nm之间的电纺丝溶液纳米纤维形成。 没有刺激性颗粒的静电纺丝的方法是在静电纺丝过程中或静电纺丝后引入可刺激的颗粒到纤维上，从而导致所得的纤维垫。

公开(公告)号：US20140287230A1

公开(公告)日：2014-09-25

申请号：US14356755

申请日：2012-11-09

Applicant: RESEARCH TRIANGLE INSTITUTE ,  NORTH CAROLINA STATE UNIVERSITY

Inventor： Howard J. Walls ,  David S. Ensor ,  Christopher J. Oldham ,  Gregory N. Parsons

IPC: B01D39/08 ,  D03D1/00 ,  D03D15/00 ,  D04H1/728

CPC classification number: B01D39/08 ,  B01D39/1615 ,  B01D2239/025 ,  B01D2239/0492 ,  C23C16/403 ,  C23C16/4417 ,  C23C16/45555 ,  D03D1/00 ,  D03D15/0061 ,  D04H1/728 ,  Y10T428/268

Abstract: A fiber media and a filter device. The fiber media has a plurality of nanofibers formed of a polymer material, having diameters less than 1 micron, and formed into a fiber mat. A barrier layer is disposed on the nanofibers to prevent dissolution of the nanofibers in the fiber mat upon exposure of the fiber mat to a solvent of the polymer material. The barrier layer coated nanofibers have a maximum strain before breakage of at least 2%. The filter device includes the fiber media and a support attached to the fiber mat.

Abstract translation: 纤维介质和过滤装置。 纤维介质具有由聚合物材料形成的多个纳米纤维，其直径小于1微米，并形成纤维垫。 阻挡层设置在纳米纤维上，以防止纤维垫暴露于聚合物材料的溶剂时纳米纤维在纤维垫中的溶解。 阻隔层涂覆的纳米纤维在断裂之前具有至少2％的最大应变。 过滤装置包括纤维介质和附着到纤维垫的支撑件。