# US 2023/0264147 A1 · Nanoparticle filtration membrane and the manufacturing method thereof

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- Number: US 2023/0264147 A1
- Document ID: US20230264147A1
- Status: Published application
- Kind: A1
- Application number: 18/169,899
- Filed: 2023-02-16
- Published: 2023-08-24
- Earliest claimed: 2022-02-22
- Assignees: Cabomba LLC
- Applicants: Cabomba LLC
- Inventors: Suman Sinha Ray; Kumar Natesaiyer; Sumit Sinha Ray; Terry Rosenstiel
- Web page: https://patentgrep.com/patent/US20230264147A1

## CPC

- B01D 61/027: {Nanofiltration}
- B01D 67/00042: {by deposition of fibres, nanofibres or nanofibrils}
- B01D 67/0027: {by stretching}
- B01D 69/02: characterised by their properties
- D01D 5/0069: {characterised by the spinning section, e.g. capillary tube, protrusion or pin}
- D01D 5/14: with flowing liquid {or gaseous} stretching media {, e.g. solution-blowing}
- B01D 61/145: {Ultrafiltration}
- B01D 2323/35: Use of magnetic or electrical fields
- B01D 2323/39: Electrospinning
- B01D 2325/04: Characteristic thickness
- D01D 5/0084: {Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses}
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS

## Abstract

The present innovation relates to novel and versatile nanomembrane to be used in filtration system and manufacturing method to produce it. The filter membrane may result in significant reduction in energy demand and higher capture efficiency. The filter membrane may have one or multiple nanomembrane part of overall filtration system. The manufacturing uses a combined electric and air flow field to produce the nanomembrane, which may be included as in-line module in standard filter manufacturing process. The method of nanomembrane production is optimized by machine learning-based optimization protocol based on physics-based modeling via feedback control.

## Claims

### Claim 1

A filtration system for filtration of fluid, both air and/or liquid, the filter system comprising:
single or plurality of nanomembranes being included in the filter design, where the nanomembranes being sandwiched between traditional filtration components and/or nanomembrane coating on traditional filter components, wherein the resultant filtration system can be cut, formed and shaped into a variety of shapes and/or the filter can have 3D hierarchical design to start with and the nanomembrane can be added as an addendum.

### Claim 2 (depends on 1)

The nanomembranes of claim 1, consists of nanofibers, which can be of any materials but primarily polymeric or polymer derived in nature, have diameter ≤ 100 nm and thickness of each nanomembrane may not exceed 500 nm.

### Claim 3 (depends on 1)

The nanomembranes of claim 1, will result in higher capture efficiency, at least 20-50%, especially nanoparticles with diameter ≤ 400 nm.

### Claim 4 (depends on 1)

The nanomembranes of claim 1, may allow higher volumetric porosity of the overall filter system resulting in significantly lower energy demand.

### Claim 5 (depends on 1)

The nanomembrane of claim 1, may not require any further treatment to adhere to the filter system owing to its superior van der Waals force in its original polymeric form. However, a polymer derived material namely, copolymer, ceramic etc. may require further treatment.

### Claim 6 (depends on 1)

A method of making nanomembrane-based filter of claim 1, wherein method comprises of producing stream of polymer jet resulting in polymer nanofibers of diameter ≤ 100 nm using a combined stretching force of high electric field (~1-5 kV/cm) and high velocity air flow field (subsonic and supersonic) getting collected on collector membrane, wherein single or plurality of polymer jet issuing methods comprising of cylindrical rotor submerged in polymer bath with or without exterior patterns and/or series of sharp objects (e.g.- needles) submerged in polymer bath and/or polymer jet issuing head with patterned opening or needles or oscillating stoppers capable of closing and opening slot issuing polymer jets against or in the direction of gravity utilizing polymer jet instabilities to drive attenuation polymer jets to diameter ≤ 100 nm.

### Claim 7 (depends on 6)

The method of claim 6 gets enhanced by physics-based computer vision and AI/ML/edge computing methodology, whereby process specific output is optimized based on input and environmental parameters.