Thermal history-based etching

Patent metadata

Field	Value
Publication number	US-10155688-B2
Application number	US-201715794824-A
Country	US
Kind code	B2
Filing date	Oct 26, 2017
Priority date	Mar 28, 2014
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

A method for adjusting an etchability of a first borosilicate glass by heating the first borosilicate glass; combining the first borosilicate glass with a second borosilicate glass to form a composite; and etching the composite with an etchant. A material having a protrusive phase and a recessive phase, where the protrusive phase protrudes from the recessive phase to form a plurality of nanoscale surface features, and where the protrusive phase and the recessive phase have the same composition.

First claim

What is claimed is:

1. A method comprising:
combining a first borosilicate glass with a second borosilicate glass to form a preform bundle;
adjusting a first etchability of the first borosilicate glass and a second etchability of the second borosilicate glass by heating and drawing the preform bundle one or more times to produce a fiber;
etching the fiber with an etchant to create a plurality of nanoscale surface features of from 1-2000 nm;
wherein the adjusting step comprises passing the preform bundle through a furnace at a temperature of from 800 to 900 degrees Celsius at a rate of from 0.5 to 3 mm/min, with a residence time of from 20 to 40 minutes.

2. The method according to claim 1 , wherein the dimensions of the preform bundle is from 1-2 inches thick; and from 1 to 1.5 meters in length.

3. The method according to claim 1 , further the adjusting step further comprises pulling the preform bundle out of the furnace at a rate of from 2-8 m/min to produce the fiber having a thickness of 0.5 to 1 mm.

4. The method according to claim 1 , wherein the first borosilicate glass comprises a plurality of rods, wherein the second borosilicate glass comprises a plurality of tubes.

5. The method according to claim 4 , wherein one or more of the plurality of rods are disposed within a central portion of the one or more of the plurality of tubes.

6. The method according to claim 4 , wherein one or more of the plurality of rods are encircled by a plurality of the plurality of tubes.

7. The method according to claim 1 , further comprising cutting the fiber into a plurality of fiber lengths each having a length of from 500 to 700 mm.

8. The method according to claim 7 , further comprising bundling the plurality of fiber lengths into a fiber bundle prior to etching.

9. The method according to claim 8 , further comprising slicing the fiber bundle to form a wafer prior to etching.

Assignees

• Ut Battelle Llc

Inventors

• Simpson John T

Classifications

• C03C3/089

  containing boron · CPC title

• C03B37/028

  Drawing fibre bundles, e.g. for making fibre bundles of multifibres {, image fibres; (drawing multicore or photonic crystal fibres C03B37/027)} · CPC title

• C03B37/01214

  for making preforms of multifibres, fibre bundles other than multiple core preforms · CPC title

• C03B2201/10

  doped with boron (C03B2201/14 takes precedence) · CPC title

• Y10T428/24355

  Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.] · CPC title