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Meet the team

The group on a typical cloudy Birmingham morning!

Dr Steve (Stephen) Fielden

Steve is originally from Bury, Greater Manchester. He completed a MChem from the University of Oxford in 2015. His Part II project was undertaken in the group of Prof. Véronique Gouverneur FRS. He then completed a PhD with Prof. David Leigh FRS at the University of Manchester. He researched the synthesis and application of mechanically interlocked molecules, including rotaxanes, catenanes and knots. After a postdoctoral position in the same group, Steve moved to the group of Prof. Rachel O'Reilly FRS at the University of Birmingham in 2021 to research polymer nanotechnology.

 

Steve held a Leverhulme Early Career Fellowship from 2021-2025. Steve now holds a Royal Society Dorothy Hodgkin Fellowship, which allowed him to launch the Fielden Research Group in February 2025. Steve has also been awarded an ERC Starting Grant, which started in February 2026.

In his spare time, Steve likes to drink whisky, build Brio train sets with his sons, and play with Rufus (his badly behaved poochon dog).​​​​

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Dr James Barclay - Postdoc

Hi, I’m James! Originally from Southwest England, I grew up in Salisbury. I completed my MChem at the University of Southampton, with a brief stint at the University of Twente in the Netherlands, where I developed droplet based microfluidic systems for chemical analysis. I then moved to Durham University for my PhD studies in 2018, working under Dr Matthew Kitching, where I investigated compartmentalisation of chemical reactivity using stimulus responsive droplets. In 2023, I started a PDRA at Durham, working under Professors Clare Mahon and Andrew Beeby, developing new analytical tools to optimise the effectiveness of detergent formulations. In 2026, took up a position in the Fielden Group, where I will be investigating Ostwald ripening and its use in developing dynamic nanoemulsions. Outside of work, I enjoy cooking, going on walks, and spending time with my cat.

Dr David Gutiérrez-Armayor

Hey, I’m David, from Asturias, Spain! I obtained my BSc. in Chemistry in the University of Oviedo, close to my home, focusing on the synthesis of new MOFs for sensing applications with Prof. García-Alonso. From there, I moved to Donostia, to obtain a MSc. in Nanoscience, where I worked with Dr. Malo de Molina in the synthesis and characterisation through scattering techniques of protein-based single chain nanoparticles. Shortly after, I ended up in Germany, at the Technical University of Munich, under the supervision of Prof. Costa, working on the fabrication of LEDs based on chemically modified fluorescent proteins. And now I am here! With Steve, we hope to devise new strategies to control Ostwald ripening, making use of light as our stimulus. Chances are, if I am not in the lab, I am either rowing, cycling, or obsessing about trains and other transit systems.

Dan Espanhol - PhD student

Hi, I’m Dan - originally from Portugal, but I've grown up mainly in South West London. My undergraduate and Master's studies were completed at the University of Oxford (MChem), where I was a student at Teddy Hall. My Master’s research focused on designing and developing stimuli-responsive, Boolean logic-gated polymeric and liposomal nanoparticles for use as MRI contrast agents. Outside the lab, I enjoy hiking, sports, and the occasional pub quiz.

Qiuxia Tan - PhD student

I’m Qiuxia Tan from China. I graduated from Central South University. My previous research was focussed around tumour photodynamic therapy technology. During my free time I love playing badminton, listening to music, or just sleeping. If you want to play mahjong, come with me!

Kester Arden Armitage - PhD student

Hi, I’m Kester from Sheffield! I completed my undergraduate and master’s degrees at Durham University, where I had the opportunity to work with Dr. Mark Fox on the synthesis of complex carboracycles – specifically molecules featuring meta-carborane. It was a fascinating and technically challenging project, often involving weeks of tricky separation work. I’m now excited to take on new challenges and explore different areas of chemistry. Outside the lab, I love playing guitar, writing and recording music, and diving into all kinds of genres – any album recommendations are appreciated!

Past members:

Brendan O'Connor (MSci, 2025-2026)
Hattie Barrington (MSci, 2023-2024)

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