Facile Synthesis of a Broad Range of Colloidal Nanocrystals by Membrane-Mediated pH Gradient under Ambient Conditions

Author:

Ranjbar Bahadori Shahab1,Hart Ryan1,Mulgaonkar Aditi2,Wang Yunfeng3,Fuentes Samuel1,Hong Yi4ORCID,Cao Ye1,Jiang Jiechao1ORCID,Sun Xiankai2ORCID,Hao Yaowu1

Affiliation:

1. Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, TX 76019, USA

2. Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA

3. Department of Mechanical Engineering, The College of New Jersey, Ewing, NJ 08618, USA

4. Department of Bioengineering, University of Texas at Arlington, Arlington, TX 76019, USA

Abstract

We report a simple synthesis process for a wide variety of ultrasmall nanocrystals. Simply immersing a dialysis bag containing an aqueous solution of a metal salt mixed with citric acid in a NaOH solution reservoir for 10 min, nanocrystals measuring only a few nanometers in size are formed inside the dialysis bag. We demonstrated the synthesis of ultrasmall nanocrystals of Co, Ni, Cu, Ag, Au, Pd, Cu2O, FeO, and CeO2, and found that the gradual change in pH caused by the diffusion of OH− ions through the dialysis membrane played an essential role in the formation of these nanocrystals. This method can be readily adapted for almost all transition metal elements, providing researchers in the fields of catalysis and nanomedicine an easy access to a wide range of ultrasmall metal and oxide nanocrystals.

Funder

National Institutes of Health

Cancer Prevention and Research Institute of Texas

Department of Energy

Dr. Jack Krohmer Professorship funds

National Science Foundation

Faculty Science and Technology Acquisition and Retention (STARs) Program in the University of Texas System

startup funding from the University of Texas at Arlington

Characterization Center for Materials and Biology at UT Arlington

Publisher

MDPI AG

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