University of Rhode Island Scientists Put Plastics Research Under the Microscope—Literally

Microplastics prepared to be analyzed by scanning electron microscopy. Photo by Beau Jones

written by CHRIS BARRETT ’08 for URI’s Momentum: Research & Innovation Magazine, Spring 2021

When plastics break apart, the material leaves a trail of pieces often visible only with specialized equipment. That’s where the University’s core facilities and their researchers step in with equipment and expertise. To understand the role of plastics in our world, imaging equipment housed within the University of Rhode Island’s (URI) core facilities analyze plastic particles so small that it would be like finding a single drop of water in an Olympic sized pool.

Scientists leverage that data to trace plastics pollution in waterways to its source, to understand how plastic particles harm animals, as well as to develop nanoplastics that deliver life-saving medicines into our bodies. “People are looking at microplastics in a lot of different areas; they are popping up everywhere and we don’t know if they’re good, bad or neutral,” said Rhode Island Consortium of Nanoscience and Nanotechnology Director Irene Andreu.

Yet, looking at micro and nanoplastics poses significant challenges. Plastics comprise a wide variety of polymers with additives to change their texture, rigidity and color. When plastics break apart, the material leaves a trail of pieces often visible only with specialized equipment. That’s where the University’s core facilities and their researchers step in with equipment and expertise.

From Pollution to Product: URI Textiles Expert Izabela Ciesielska-Wrobel Works to Weave Plastics into Cloth

She remembers how she felt as she absorbed the enormity of the situation: storm-size gyres of plastics debris swirling upon the world’s oceans. “Terrified,” says Izabela Ciesielska-Wrobel, an assistant professor of the URI College of Business specializing in Textiles, Fashion Merchandising and Design. “It broke my heart.”

So she dealt with it the only way she could – she decided that as a scientist, she needed to start working on a solution, via an area she knows like the back of her hand: textile technology and manufacturing. “I started to think of the plastics problem in terms of what I know, and that’s how it started for me,” says Ciesielska-Wrobel, whose academic career has focused her studies on knitting, weaving, spinning, and non-woven technologies.

A native of Poland, Ciesielska-Wrobel secured her Ph.D. in 2007 by studying how people’s bodies register different fabrics, documenting, for example, the effects that certain textiles can have on body temperature and movement ability. She spent an initial research stint in textile product development in the private sector in Virginia, and was able to achieve textile research funding from the U.S. Department of Energy and the Department of Defense.

She then arrived at URI, and started to pursue in depth her study of ocean plastics. At the core, she says, she felt that textiles technology could play an expanded role in solving this pressing pollution problem. “We already know how plastic PET bottles can be made into fabrics,” she says, “but what if we could use more of other kinds of plastics, and what if we could use these plastics to make other kinds of textiles, for many uses?”

One of her chief interests with this work – she wants to be able to transform plastic waste into filaments, then yarns material, and finally cloth – is to make a durable enough product that could be a base for longer lasting clothes and other household and business items. “We need to be thinking about sustainability,” she says. “We should be thinking about items that last, instead of items that are thrown away and cause more problems.”

But, she indicates, that something easier said than done, as business models today often reflect a dependence on throw-away products. “Wrap2Wear” is the name she has given her in-process technology textiles, and she spends time talking with other scientists, business experts, entrepreneurs, and textile companies to build interest in, and support for, these efforts. And she shares her work with her students, and sees great potential in the next generation to take on ocean plastics and similar problems of the day. “It’s very exciting,” says Ciesielska-Wrobel. “I love working with students, and they have many ideas about this kind of solution to ocean plastics.”

Ultimately, the problem of ocean plastics is a large one – and one that will require expertise from many knowledge arenas to solve. “We have had our wake up call. For me, being able to apply what I know from my work with textiles is the way that I feel I can be most helpful,” says Ciesielska-Wrobel. “But we can all do something. We all have a role to play with this.”

Professor Elizabeth Mendenhall: Propelling Policy for Ocean Plastics

Dr. Elizabeth Mendenhall is an Assistant Professor of Marine Affairs and Political Science at URI. Photo credit: Beau Jones.

Elizabeth Mendenhall article lays out “A research agenda to propel policy development” regarding ocean plastics. According to Mendenhall, although the phenomenon of marine plastic debris is now widely recognized as a problem for the international community, significant gaps in understanding still inhibit the creation and implementation of effective policy responses. This paper reviews the state of scientific knowledge about the causes and consequences of marine plastic debris, including its sources, pathways, composition, location, and impacts on ecosystems and human activities. Much remains unknown about the large scale impacts of plastic debris on ecosystem functions and human health, among other information gaps. Mendenhall suggests that additional scientific research about the nature, extent, and harms of marine plastic debris could increase the political salience of the problem, and produce urgent and focused attention on the formulation of solutions. She also notes that while many policy responses have been proposed, and even pursued, additional research could assist in the prioritization of the most cost-effective strategies. Finally, Mendenhall offers that the research agenda outlined would support a more detailed and comprehensive assessment of the nature of the problem of marine plastic debris, and inform the creation and implementation of effective solutions.

Read the paper

Surface Science for Plastics Solutions

Postdoctrocal student Animesh Pan (left) and summer undergraduate research fellow Natalie Paik from the Rhode Island School of Design (right) present on their project developing a process for artificially weathering commercial plastics and breaking them down mechanically into micro and nano particles for further studies.

Geoff Bothun, professor of Chemical Engineering and his team were awarded $423k National Science Foundation’s Chemical, Bioengineering, Environmental and Transport Systems grant for the project

“The concentration of small plastic particles in the sea surface microlayer can be much higher than in the underlying water. This is due in part to the transformation of the particles as naturally occurring molecules adsorb onto their surfaces and make them more prone to reside near the air/water interface. There is a significant amount of life that resides near or within the sea surface microlayer and it’s really important that we understand the factors that cause particles to accumulate there,” explains Bothun

Accumulation and transformation of micro- and nano-plastics within the sea surface microlayer. A critical natural component of oceans and a point of initial exposure to plastic pollution are sea surface microlayers, which are ubiquitous globally and are comprised of natural molecules, particulate matter, and microorganisms.

These microlayers act as an “ocean skin” that influences the exchange of mass and heat between the seawater and the atmosphere. They are also a site of microplastic and nanoplastic accumulation. This project will study how microplastics and nanoplastics interact with model sea surface microlayers, how these interactions cause them to accumulate and transform at the sea surface, and to what extent microplastics and nanoplastics will alter the properties of sea surface microlayers.

The goal is to provide fundamental insight into interfacial and colloidal properties leading to microplastic and nanoplastic accumulation that can contribute broadly to determining environmental risks of plastic pollution and to devising strategies for remediation.