Posted in | News | Nanomaterials | Nanoanalysis

Green Chemistry Unlocks Diverse Gold Nanoparticles

Researchers from Flinders University's Nanotechnology Department collaborated with international scientists to develop the size and shape of gold nanoparticles from different VFD processing parameters and concentrations of gold chloride solution, as published in a recent article in Small Science.

Ph.D. candidate Badriah Alotaibi with a gold chloride solution and the vortex fluidic device used in the research experiments
Ph.D. candidate Badriah Alotaibi with a gold chloride solution and the vortex fluidic device used in the research experiments. Image Credit: Flinders University

Researchers made this startling discovery by modifying the water flow in the innovative vortex fluidic device. They created a variety of distinct kinds of gold nanoparticles without the use of hazardous chemicals.

The discovery of a contact electrification reaction in the device’s water, which produced hydrogen and hydrogen peroxide, resulted from the green chemistry lab work on the creation of nanogold.

Through this research, we have discovered a new phenomenon in the vortex fluidic device. The photo-contact electrificiation process at the solid-liquid interface which could be used in other chemical and biological reactions.

Ms Badriah Alotaibi Ph.D., Study Lead, Flinders University

Alotaibi continued, “We also have achieved synthesis of pure, pristine gold nanoparticles in water in the VFD, without the use of chemicals commonly used – and thus minimizing waste. This method is significant for the formation of nanomaterials in general because it is a green process, quick, scalable, and yields nanoparticles with new properties.”

Various applications, including drug delivery, catalysis, sensing, and electronics, depend on the size and shape of gold nanoparticles because of their unique physical, chemical, and optical characteristics.

The vortex fluidic device, developed 10 years ago by Colin Raston, a Professor at Flinders University and senior author, consists of a quickly rotating tube that is open at one end and uses jet feeds to deliver liquids. Particles can be synthesized to specifications using the device by applying light externally and rotating at different speeds.

Researchers around the world are now finding the continuous flow, thin film fluidic device useful in exploring and optimizing more sustainable nano-scale processing techniques. In this latest experiment, we hypothesize that the high shear regimes of the VFD led to the quantum mechanical effect known as contact electrification, which is another exciting development.

Colin Raston, Professor and Study Senior Author, Flinders University

Professor Raston said, “This discovery is a paradigm shift in how to make materials in a controlled way using water, with no other chemicals required, which contributes to a more sustainable future.”

The Australian National Fabrication Facility (ANFF), the Australian Microscopy and Microanalysis Research Facility (AMMRF), the College of Science and Engineering mechanical workshop at Flinders University, and the Australia Research Council funded the study.

Immiscible Liquids - Green Chemistry Solutions

Video Credit: Flinders University.

Journal Reference:

Alotaibi, M. B., et al. (2024) Nanogold Foundry Involving High‐Shear‐Mediated Photo contact Electrification in Water. Small Science.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.