US 12,440,924 B2
Laser-based high-throughput surface nano-structuring (NHSN) process
Hongtao Ding, Coralville, IA (US); Qinghua Wang, Iowa City, IA (US); Avik Samanta, Iowa City, IA (US); and Ninggang Shen, Iowa City, IA (US)
Assigned to University of Iowa Research Foundation, Iowa City, IA (US)
Filed by University of Iowa Research Foundation, Iowa City, IA (US)
Filed on Feb. 12, 2021, as Appl. No. 17/175,223.
Application 17/175,223 is a division of application No. 16/107,496, filed on Aug. 21, 2018, abandoned.
Claims priority of provisional application 62/547,999, filed on Aug. 21, 2017.
Prior Publication US 2021/0237201 A1, Aug. 5, 2021
Int. Cl. B23K 26/352 (2014.01); B05D 5/08 (2006.01); B05D 1/18 (2006.01); B05D 3/06 (2006.01); B05D 3/12 (2006.01); B05D 7/14 (2006.01)
CPC B23K 26/355 (2018.08) [B05D 5/08 (2013.01); B05D 1/18 (2013.01); B05D 3/06 (2013.01); B05D 3/12 (2013.01); B05D 7/14 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of making a nanostructured metal surface, the method comprising:
treating at least a portion of a first major surface of a metal piece along a laser scan path of a laser at a laser scanning time of at least about 0.25 seconds/in2, to obtain a treated metal surface along the laser scan path, the treated metal surface having random micro- and nanoscale structures along the laser scan path;
wherein:
the at least one portion of the first major surface of the metal piece is scanned in a zig-zag pattern;
an X-spacing defines the distance between two sequential laser scan lines in the pattern, along the laser scan path;
a Y-spacing defines the spacing between two sequential laser shots along a scanning direction along the laser scan path; and
an overlap ratio of 50% exists in both the x-spacing and the Y-spacing;
and wherein: the treated metal surface has a reflectance within a visible spectrum, within an IR-A spectrum, and within an IR-B spectrum; and
wherein the treated metal surface has at least one of a water contact angle when exposed to water of at least 120° and a spectral reflectance of less than 25% within the visible spectrum.