Amphiphilic nanosheets and methods of making the same

Patent metadata

Field	Value
Publication number	US-9586983-B2
Application number	US-201514624974-A
Country	US
Kind code	B2
Filing date	Feb 18, 2015
Priority date	Mar 21, 2012
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

In some embodiments, the present invention provides amphiphilic nanosheets that comprise lamellar crystals with at least two regions: a first hydrophilic region, and a second hydrophobic region. In some embodiments, the amphiphilic nanosheets of the present invention also comprise a plurality of functional groups that are appended to the lamellar crystals. In some embodiments, the functional groups are hydrophobic functional groups that are appended to the second region of the lamellar crystals. In some embodiments, the lamellar crystals comprise α-zirconium phosphates. Additional embodiments of the present invention pertain to methods of making the aforementioned amphiphilic nanosheets. Such methods generally comprise appending one or more functional groups to a stack of lamellar crystals; and exfoliating the stack of lamellar crystals for form the amphiphilic nanosheets.

First claim

What is claimed is:

1. An amphiphilic nanosheet comprising:
lamellar crystals; and
a plurality of functional groups appended to the lamellar crystals,
wherein the lamellar crystals are stacked into layered compounds and exfoliated into layers, wherein the nanosheet comprises at least two regions, a first region and a second region, wherein the first region is hydrophilic, and wherein the second region is hydrophobic, wherein the functional groups comprise octadecyl isocyanate.

2. The amphiphilic nanosheet of claim 1 , wherein the lamellar crystals are selected from the group consisting of clays, zirconium phosphates, titanium phosphates, hafnium phosphates, silicon phosphates, germanium phosphates, tin (IV) phosphates, lead (IV) phosphates, niobates, titanates, organic crystals, graphites, graphenes, polyhydroxybutyric acids, and combinations thereof.

3. The amphiphilic nanosheet of claim 1 , wherein the lamellar crystals comprise α-zirconium phosphates.

4. The amphiphilic nanosheet of claim 1 , wherein the nanosheet has a thickness ranging from about 0.5 nm to about 5 nm.

5. The amphiphilic nanosheet of claim 1 , wherein the nanosheet has a diameter ranging from about 10 nm to about 10 μM.

6. The amphiphilic nanosheet of claim 1 , wherein the nanosheet has a surface area ranging from about 1 m 2 g −1 to about 200 m 2 g −1 .

7. The amphiphilic nanosheet of claim 1 , wherein the nanosheet has an aspect ratio ranging from about 3500 to about 10.

8. The amphiphilic nanosheet of claim 1 , wherein the functional groups are hydrophobic.

9. The amphiphilic nanosheet of claim 1 , wherein the functional groups are appended to at least one surface of the lamellar crystals.

10. The amphiphilic nanosheet of claim 1 , wherein the functional groups are appended to at least one edge of the lamellar crystals.

11. The amphiphilic nanosheet of claim 1 , wherein the appended functional groups are further chemically reacted.

12. The amphiphilic nanosheet of claim 1 , wherein the nanosheet is capable of self-assembly.

Assignees

• Texas A & M Univ Sys

Inventors

• Cheng Zhengdong
• Mejia Andres F
• Diaz Agustin
• Clearfield Abraham
• Mannan Mahboobul S
• Chang Ya-Wen

Classifications

• C01P2002/88

  by thermal analysis data, e.g. TGA, DTA, DSC · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01B33/26

  Aluminium-containing silicates {, i.e. silico-aluminates} · CPC title

• C01P2002/82

  by IR- or Raman-data · CPC title