# US 10,870,927 B2 · Digital electrospinning array

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- Number: US 10,870,927 B2
- Document ID: US10870927B2
- Status: Granted
- Kind: B2
- Application number: 15/656,772
- Filed: 2017-07-21
- Published: 2019-01-24
- Granted: 2020-12-22
- Earliest claimed: 2017-07-21
- Assignees: Palo Alto Research Center Incorporated
- Applicants: Palo Alto Research Center Incorporated
- Inventors: David Mathew Johnson
- Web page: https://patentgrep.com/patent/US10870927B2

## CPC

- D01D 4/025: {Melt-blowing or solution-blowing dies}
- D01D 5/0069: {characterised by the spinning section, e.g. capillary tube, protrusion or pin}
- D04C 1/02: made from particular materials
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D04C: BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE (machines for making soles from strips of material A43D29/00; cane working B27J1/00)

## Abstract

An electrospinning system for weaving nanofibers may include a digital array of addressable nozzles electrowetted with a liquid nanofiber source material. Each nozzle in the array may include an individually controllable actuator and electrode for modulating the flowrate and charge of the liquid nanofiber source material. Through selectively applying pressure and voltage to individual nozzles, the location of the nanofiber relative to the array may be controlled through digital signals alone, without having to physically move any component of the electrospinning system. By simultaneously controlling the path of multiple nanofibers within the array, new and complex weaving patterns for braids may be achieved with enhanced strength and other properties at a scale previously unattainable.

## Claims

### Claim 1

A system for weaving electrospun nanofibers, the system comprising:
an array of individually addressable electrospinning nozzles, the array wettable by liquid nanofiber material, each nozzle having:
an orifice for forming a meniscus of the liquid nanofiber material at the nozzle;
an electrode for selectively applying voltage at the nozzle to modulate an electrostatic charge of the liquid nanofiber material;
an actuator for selectively controlling pressure at the nozzle, the actuator responsive to electrical control signals; and
a channel in communication with the nozzle and in communication with the orifice for feeding liquid nanofiber material to form the electrospun nanofibers; and
a controller in communication with the electrodes and actuators for each nozzle to selectively and digitally apply and modulate the voltages to individually control the electrostatic charge at each nozzle to allow a fiber of the liquid nanofiber material to move between nozzles while being created and the controller to selectively control the actuator at each nozzle with signals separate from the signals to the electrodes to control the electrostatic charge.

### Claim 2 (depends on 1)

The system of claim 1, further comprising a counter-electrode facing the array of addressable electrospinning nozzles.

### Claim 3 (depends on 1)

The system of claim 1, further comprising a memory for storing addresses and weaving patterns.

### Claim 4 (depends on 1)

The system of claim 1, further comprising a sensor to detect electrospun nanofibers within the array.

### Claim 5 (depends on 1)

The system of claim 1, wherein the electrospinning nozzles are laid out as a rectangular grid within the array.

### Claim 6 (depends on 1)

The system of claim 1, wherein the electrospinning nozzles have a diameter of about 0.1 to 100 microns.

### Claim 7 (depends on 6)

The system of claim 6, wherein the electrospinning nozzles have a diameter of about 10 microns.

### Claim 8 (depends on 1)

The system of claim 1, wherein the electrospinning nozzles have a diameter and the electrospinning nozzles are spaced apart within the array a distance in a range of 2 to 4 diameters.

### Claim 9 (depends on 1)

The system of claim 1, wherein the electrospun nanofibers have travelled along paths relative to the array according to a weaving pattern to form a woven nanobraid.

### Claim 10 (depends on 1)

The system of claim 1, wherein the actuator comprises a piezoelectric element.

### Claim 11 (depends on 10)

The system of claim 10, wherein the piezoelectric element comprises a membrane.