Nanostructure and method for producing same

Patent metadata

Field	Value
Publication number	US-12139796-B2
Application number	US-202017624363-A
Country	US
Kind code	B2
Filing date	Jul 2, 2020
Priority date	Jul 3, 2019
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

A nanostructure is made of a plurality of nanocrystals on at least one surface or surface region of a titanium body. A method for generating such nanostructure is by means of hydrothermal oxidation. Thereby, the nanocrystals have a basic tetragonal-pyramidal shape, at least in some regions. The area density of the nanocrystals is between 40 and 400 per μm 2 , wherein the area density decreases with increasing crystal height. The average spacing of 50 to 160 nm of adjacent nanocrystals is obtained at a nanocrystal height of 23 to 100 nm. This provides a titanium-based, bactericidal and hydrophilic nanostructure for implant surfaces and, at the same time, a corresponding manufacturing method with which the size and distribution of the nanocrystals forming a nanostructure that facilitates healing can be determined.

First claim

The invention claimed is:

1. A nanostructure ( 20 ) made of a plurality of nanocrystals on at least one surface ( 39 ) or surface region of a titanium body ( 10 ),
wherein the nanocrystals ( 40 ) have a tetragonal-pyramidal basic shape, at least in some regions,
wherein an area density of the nanocrystals ( 40 ) per μm 2 is between 40 and 400, wherein the area density decreases with increasing crystal size, and
wherein an average spacing between adjacent nanocrystals ( 40 ) at a height of 23 to 100 nm is 50 to 160 nm.

2. The nanostructure according to claim 1 ,
wherein at least 60% of the nanocrystals ( 40 ) have a square, quadrilateral, rectangular, rhombic, parallelogram-shaped, trapezoidal, or kite-shaped base surface ( 41 ).

3. The nanostructure according to claim 2 ,
wherein the nanocrystals ( 40 ) have a pyramid angle ( 51 ) of 16 to 46 angular degrees.

4. The nanostructure according to claim 2 ,
wherein the nanocrystals ( 40 ) have a base width ( 45 ) of 50 to 150 nm.

5. The nanostructure according to claim 2 ,
wherein a tip region of the nanocrystals ( 40 ) has, at a height corresponding to 85 to 95% of the total nanocrystal height ( 46 ), a circumference that is parallel to the base surface ( 12 ) and has a diameter of 10 to 50 nm, against which at least two nanocrystal edges ( 42 ) abut.

6. The nanostructure according to claim 2 ,
wherein an angle of inclination ( 53 ) of the nanocrystals ( 40 ) lying between a normal direction ( 32 ) of the base surface ( 12 ) and a center line ( 52 ) of the individual nanocrystal ( 40 ) is less than 30 angular degrees.

7. The nanostructure according to claim 1 ,
wherein the area density of the nanocrystals refers to the nanocrystals ( 40 ) whose total height ( 46 ) is greater than 0.3 times the maximum roughness profile height ( 48 ).

8. A method for generating a nanostructure ( 20 ) made of tetragonal-pyramidal nanocrystals on at least one surface ( 39 ) or surface region of a titanium body ( 10 ) by means of hydrothermal oxidation to form an oxide layer, comprising:
exposing an initial surface ( 12 ) for nanostructure generation to a 160 to 374.12° C. hot vapor pressure atmosphere for a vapor pressure exposure time from 1 to 100 h,
wherein a vapor-forming medium is demineralized water, and
wherein a nanocrystal area density and a nanocrystal size along with a color of the oxide layer of the nanostructure ( 20 ) are each a function of the vapor pressure exposure time.

9. The method according to claim 8 ,
wherein in that the demineralized water contains a hydrogen absorbing additive.

Assignees

• Karlsruher Inst Technologie
• Spindler Bruno

Inventors

• Spindler Bruno
• Doll Patrick
• Ahrens Ralf
• Guber Andreas

Classifications

• C01P2004/30

  extending in three dimensions · CPC title

• C01P2002/60

  Compounds characterised by their crystallite size · CPC title

• C01G23/04

  Oxides; Hydroxides · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title