Manganese dioxide shows potential in micromotorsNovember 14, 2017
Manganese dioxide could make the preparation of micromotors increasingly cost-effective, opening up new avenues for their use, according to a new study from the University of Eastern Finland.
Synthetic micromotors are tiny particles with dimensions less than the diameter of a human hair. Micromotors can undergo an autonomous motion in liquid environments, which can be driven by various means such as a chemical fuel, ultrasound, light or magnetic field. Fuel-driven micromotors are often catalytic in nature, which causes the transformation of a chemical fuel into reaction products that lead to a self-propulsion of the particles. Micromotors may find use in the future, for example, in targeted drug delivery, specific catalysis or chemical sensing of harmful substances.
Platinum is the most widely explored catalytic material for the preparation of micromotors. It efficiently decomposes hydrogen peroxide into oxygen gas and water. However, platinum is an extremely rare chemical element and also suffers from serious limitations, such as drastically reduced catalytic efficiency in salt-rich environments and complete inactivation in the presence of sulphur containing compounds. Manganese dioxide is an alternate inorganic material that can decompose hydrogen peroxide similar to platinum. Manganese dioxide is also cheap and available in large quantities. Thus, it is a very potential new material for the preparation of catalytic micromotors, but has been scarcely explored to date.
In the study, a variety of manganese dioxide based micromotors were synthesized and characterized in terms of their motion behaviour in solution. Based on the results, the prepared micromotors exhibited a remarkable propulsion efficiency even in the presence of very low fuel concentrations. To demonstrate their potential for practical applications, the micromotors were used for the removal of organic dyes from water. The dye removal process was based on a unique effect that combined catalytic degradation and adsorptive bubble separation processes. The dye removal efficiency was over 90% in just one hour of reaction time without external mixing. In addition, manganese dioxide was used as a simple means for protecting the conventional platinum-based micromotors from sulphur toxicity.
Self-propelling micromotors may offer new opportunities to deliver drugs precisely to the tumour, with minimal adverse effects to the healthy tissues. Micromotors also possess an enormous potential to convert water pollutants into non-toxic or less-toxic products, even at difficult to reach areas and remote field locations, where external means of mixing to speed up the processes are not viable. Manganese dioxide micromotors, which can undergo a fast motion for a sufficient period of time in the presence of a low concentration of hydrogen peroxide, are expected to find diverse applications for active drug delivery and water remediation.
For further information, please contact: Muhammad Safdar, Early Stage Researcher, email@example.com, +358449149542
Do Minh, T.; Safdar, M.; Jänis, J. Protection of Platinum-Based Micromotors from Thiol Toxicity by Using Manganese Oxide, Chem. Eur. J. 2017, 23, 8134-8136. 10.1002/chem.201700788
University of Eastern Finland
Related Water Articles:
Researchers at the University of Pittsburgh's Swanson School of Engineering have found that the unusual properties of graphane -- a two-dimensional polymer of carbon and hydrogen -- could form a type of anhydrous 'bucket brigade' that transports protons without the need for water, potentially leading to the development of more efficient hydrogen fuel cells for vehicles and other energy systems.
When water comes in for a landing on the common catalyst titanium oxide, it splits into hydroxyls just under half the time.
Through a five-year, $500,000 CAREEER Award from the National Science Foundation, a civil and environmental engineering research group at the University of Pittsburgh's Swanson School of Engineering will be developing new DNA sequencing methods to directly measure viral loads in water and better indicate potential threats to human health.
When escaping from attacking predators, different water strider species adjust their jump performance to their mass and morphology in order to jump off the water as fast and soon as possible without breaking of the water surface.
There are two types of liquid water, according to research carried out by an international scientific collaboration.
Stomach MRI images combined with functional fMRI of the brain activity have provided scientists new insight into how the brain listens to the stomach during eating.
A new study led by scientists at the University of Miami Rosenstiel School of Marine and Atmospheric Science found that shallow-reef corals are more closely related to their shallow-water counterparts over a thousand miles away than they are to deep-water corals on the same reef.
Researchers found that very low water pressure was an acceptable, low-cost alternative for washing out open fractures, and that the reoperation rate was higher in the group that used soap.
A University of Texas at Arlington environmental engineer is creating an integrated decision support tool for optimal operation of water supply systems that will allow water providers to make better decisions about when to turn on pumps to transfer water from one reservoir system to another and when to release water downstream from the reservoirs.
Scientists at UCL have identified a new and potentially faster way of moving molecules across the surfaces of certain materials.
Related Water Reading:
Your Body's Many Cries for Water
by F. Batmanghelidj (Author), M.D. (Author)
New Edition! This is the third edition of Dr. F. Batmanghelidj' classic water book! THis book, based on a pioneering physician's twenty years of clinical and scientific research into the role of water in the body, explains a breakthrough discovery that Unintentional Chronic Dehydration(UCD) produces stress, chronic pains and many painful degenerational diseases. Dry mouth is not the only sign of dehydration; waiting to get thirsty is wrong. You will learn the different signals of thirst when your body is calling for water. Simply adjusting your water intake - yes, water! Natural, pure water!-... View Details
How to Read Water: Clues and Patterns from Puddles to the Sea
by Tristan Gooley (Author)
A New York Times Bestseller
A Forbes Top 10 Conservation and Environment Book of 2016
Read the sea like a Viking and interpret ponds like a Polynesian—with a little help from the “natural navigator”!
In his eye-opening books The Lost Art of Reading Nature’s Signs and The Natural Navigator, Tristan Gooley helped readers reconnect with nature by finding direction from the trees, stars, clouds, and more. Now, he turns his attention to our most abundant—yet perhaps least understood—resource.
... View Details
The North Water: A Novel
by Ian McGuire (Author)
The North Water View Details
Water: Up, Down, and All Around (Amazing Science)
by Natalie M. Rosinsky (Author), Matthew John (Illustrator)
Describes the water cycle and the importance of water, explaining evaporation and condensation, dew and frost, and the three states of water. View Details
Water: The Epic Struggle for Wealth, Power, and Civilization
by Steven Solomon (Author)
Far more than oil, the control of water wealth throughout history has been pivotal to the rise and fall of great powers, the achievements of civilization, the transformations of society's vital habitats, and the quality of ordinary daily lives. Today, freshwater scarcity is one of the twenty-first century's decisive, looming challenges, driving new political, economic, and environmental realities across the globe.
In Water, Steven Solomon offers the first-ever narrative portrait of the power struggles, personalities, and breakthroughs that have shaped humanity from... View Details
Water (Why Living Things Need)
by Daniel Nunn (Author)
This book explores the concept of water, and why living things – i.e., animals, humans and plants – need it. View Details
Water: A Comprehensive Guide for Brewers (Brewing Elements)
by John Palmer (Author), Colin Kaminski (Author)
Water is arguably the most critical and least understood of the foundation elements in brewing beer. Water: A Comprehensive Guide for Brewers, third in Brewers Publications’ Brewing Elements series, takes the mystery out of water’s role in the brewing process. The book leads brewers through the chemistry and treatment of brewing water, from an overview of water sources, to adjusting water for different beer styles, and different brewery processes, to wastewater treatment. The discussions include how to read water reports, understanding flavor contributions, residual alkalinity, malt... View Details
Dark Water Rising
by Marian Hale (Author)
I looked and saw water rushing in from Galveston Bay on one side and from the gulf on the other. The two seas met in the middle of Broadway, swirling over the wooden paving blocks, and I couldn’t help but shudder at the sight. All of Galveston appeared to be under water.
Galveston, Texas, may be the booming city of the brand-new twentieth century, but to Seth, it is the end of a dream. He longs to be a carpenter like his father, but his family has moved to Galveston so he can go to a good school. Still, the last few weeks of summer might not be so bad. Seth has a real job as a... View Details
Water: For Health, for Healing, for Life: You're Not Sick, You're Thirsty!
by F. Batmanghelidj (Author)
Asthma, allergies, arthritis, hypertension, depression, headaches, diabetes, obesity, and MS. These are just some of the conditions and diseases that are caused by persistent dehydration. But there is a miracle solution that is readily available, all natural, and free: water. View Details
Flour Water Salt Yeast: The Fundamentals of Artisan Bread and Pizza
by Ken Forkish (Author)
From Portland's most acclaimed and beloved baker comes this must-have baking guide, featuring recipes for world-class breads and pizzas and a variety of schedules suited for the home baker.
There are few things more satisfying than biting into a freshly made, crispy-on-the-outside, soft-and-supple-on-the-inside slice of perfectly baked bread. For Portland-based baker Ken Forkish, well-made bread is more than just a pleasure—it is a passion that has led him to create some of the best and most critically lauded breads and pizzas in the country.
In Flour Water Salt... View Details