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Synergy in two-dimensional materials, membranes research clear in professor's new work

Date:
October 10, 2018
Source:
Vanderbilt University
Summary:
Two-dimensional materials and membranes were once separate fields, but synergistic opportunities are resulting in exciting new developments at their intersection.
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Where researchers who worked with two-dimensional materials and those who worked with membranes were once separate, synergistic opportunities are resulting in exciting new developments, a Vanderbilt University chemical and biomolecular engineering professor has both opined and proven.

In a review published earlier this year in Advanced Materials, Assistant Professor of Chemical and Biomolecular Engineering Piran Kidambi and his team explored new interest in using materials only one atom thick for membrane applications. They explained the landscape on how the technology evolved and advanced and how the field is ripe for collaborations. Their technology road map suggested that research on two-dimensional materials and membranes were once separate fields, but synergistic opportunities are resulting in exciting new developments at their intersection.

Kidambi and his team more recently applied that overlap in their own work to address some of the most critical challenges in membrane research: achieving high flow-through membranes without compromising filtration performance.

The team initially focused on developing methods to directly form nanoscale holes into an atomically thin material. The team dialed down the temperature during graphene and found this resulted in nanoscale holes -- missing carbon atoms from the two-dimensional layer of them bonded in a hexagonal lattice.

"It reminded me of decreasing the temperature while baking a chocolate cake to get a different texture," Kidambi said.

However, the atomically thin graphene with nanoscales holes needed to be supported to form a membrane. The team turned to conventional polymer membrane manufacturing techniques and decided to spread a thin polymer layer on the nanoporous graphene and dipped the stack into a water bath.

The dip transformed the polymer to a porous support layer with graphene on the top, effectively forming an atomically thin membrane.

"Continuing on with the baking analogy, this was like dough transforming into porous bread -- the support polymer layer."

The team used these atomically thin membranes to demonstrate separation of salt and small molecules from small proteins.

"Most commercial membranes achieve separation at small size ranges by making a dense polymer layer that is several microns thick with tortuous pores," Kidambi said. "Diffusion across these layers is very slow. Here, we make membranes that are one atom thick and show much higher permeance -- up to 100 times greater than the state-of-the-art commercial dialysis membranes -- specifically in the low molecular weight cut-off range.

"We think these membranes could offer transformative advances for small molecule separation, fine chemical purification, buffer exchange and a number of other processes including lab-scale dialysis."


Story Source:

Materials provided by Vanderbilt University. Original written by Heidi Hall. Note: Content may be edited for style and length.


Journal References:

  1. Piran R. Kidambi Giang D. Nguyen Sui Zhang Qu Chen Jing Kong Jamie Warner An‐Ping Li Rohit Karnik. Facile Fabrication of Large‐Area Atomically Thin Membranes by Direct Synthesis of Graphene with Nanoscale Porosity. Advanced Materials, 2018; DOI: 10.1002/adma.201804977
  2. Liudmyla Prozorovska, Piran R. Kidambi. State-of-the-Art and Future Prospects for Atomically Thin Membranes from 2D Materials. Advanced Materials, 2018; 1801179 DOI: 10.1002/adma.201801179

Cite This Page:

Vanderbilt University. "Synergy in two-dimensional materials, membranes research clear in professor's new work." ScienceDaily. ScienceDaily, 10 October 2018. <www.sciencedaily.com/releases/2018/10/181010093620.htm>.
Vanderbilt University. (2018, October 10). Synergy in two-dimensional materials, membranes research clear in professor's new work. ScienceDaily. Retrieved April 25, 2024 from www.sciencedaily.com/releases/2018/10/181010093620.htm
Vanderbilt University. "Synergy in two-dimensional materials, membranes research clear in professor's new work." ScienceDaily. www.sciencedaily.com/releases/2018/10/181010093620.htm (accessed April 25, 2024).

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