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Archive for the ‘chemistry’ category: Page 157

Aug 19, 2022

New heat-tolerant, high-capacity capacitor created with solid electrolytes borrowed from all-solid-state batteries

Posted by in categories: chemistry, climatology, sustainability, wearables

Capacitors are energy storage devices—consisting of two electrodes and an electrolyte—that are capable of rapid charging and discharging because of charge adsorption and desorption properties at the electrode-electrolyte interface. Because capacitors’ energy storage does not involve chemical reactions, their storage capacity is lower than that of lithium-ion batteries, but they are useful for power leveling for renewable energy that requires repeated charging at high currents, regenerative braking energy for trains and electric or hybrid cars, as well as instantaneous voltage drop compensation devices that prevent equipment failure due to lightning strikes. They are also expected to be used to store energy for wearable devices in the near future.

Most capacitors use a liquid electrolyte with a low boiling point, which can only be used at temperatures below 80℃. Ceramic capacitors that use solid inorganic materials as a dielectric can be used at temperatures above 80℃, but their is much lower than liquid electrolyte capacitors, which limits their use to electronic circuits.

To increase the energy storage of capacitors, it is necessary to have a large contact area at the interface between the electrode and the electrolyte. Making a large contact area is difficult using ; so, the creation of a capacitor with high storage capacity that can also operate at high temperatures has been desired for a long time.

Aug 19, 2022

New Research Shows How Dopamine Plays a Key Role in Consciousness

Posted by in categories: biotech/medical, chemistry, neuroscience

The Brain Chemical Involved in Consciousness

So how do we help these people? The brain is more than just a congregation of different areas. Brain cells also rely on a number of chemicals to communicate with other cells, enabling a number of brain functions. Before our study, there was already some evidence that dopamine, well known for its role in reward, also plays a role in disorders of consciousness.

For example, one study showed that dopamine release in the brain is impaired in minimally conscious patients. Moreover, a number of small-scale studies have shown that patients’ consciousness can improve by giving them drugs that act through dopamine.

Aug 19, 2022

Scientists design new inks for 3D-printable wearable bioelectronics

Posted by in categories: 3D printing, biotech/medical, chemistry, nanotechnology, wearables

Flexible electronics have enabled the design of sensors, actuators, microfluidics and electronics on flexible, conformal and/or stretchable sublayers for wearable, implantable or ingestible applications. However, these devices have very different mechanical and biological properties when compared to human tissue and thus cannot be integrated with the human body.

A team of researchers at Texas A&M University has developed a new class of biomaterial inks that mimic native characteristics of highly conductive , much like skin, which are essential for the ink to be used in 3D printing.

This biomaterial ink leverages a new class of 2D nanomaterials known as molybdenum disulfide (MoS2). The thin-layered structure of MoS2 contains defect centers to make it chemically active and, combined with modified gelatin to obtain a flexible hydrogel, comparable to the structure of Jell-O.

Aug 19, 2022

Shielding Qubits with Chemistry

Posted by in categories: chemistry, quantum physics

The spin state of molecular qubits can be made more stable by changing the chemical environment in which the qubits sit.

Aug 19, 2022

Forever Chemicals No More? PFAS Are Destroyed With New Technique

Posted by in category: chemistry

The harmful molecules are everywhere, but chemists have made progress in developing a method to break them down.

Aug 18, 2022

New supramolecular plastic heals itself in an instant

Posted by in categories: biotech/medical, chemistry

Scientists experimenting with next-generation plastics at Finland’s University of Turku have developed a form of the material with some impressive capabilities, most notably an ability to quickly break down after use. The eco-friendly “supramolecular” plastic is therefore highly recyclable and, with careful tuning of its water content, can be turned into an adhesive or even instantly self-heal when damaged.

The reason conventional plastics persist in the environment for so long is the incredibly strong chemical connections between the monomers within them. These particles link up to form polymers through what are known as covalent bonds, but scientists hope to fashion more environmentally forms of the material based on non-covalent bonds instead.

These weaker connections are better suited to degradation and recycling of the material, but do come at a cost in terms of mechanical performance. We have looked at some interesting examples of these “supramolecular” materials in the form of hybrid polymers for drug delivery, self-assembling plastics and adhesives that work at extreme temperatures.

Aug 17, 2022

Electrons become chiral reagent in polymer synthesis

Posted by in category: chemistry

Chiral polymer made from completely achiral chemicals using only electrons’ angular momentum.

Aug 16, 2022

A simplified view of brain function

Posted by in categories: biotech/medical, chemistry, neuroscience

Source:

#neuroscience #neurotwitter #neurology #science #sciencetwitter #medtwitter #Bioinformatics #biochemistry #biotechnology #anatomy #neuroanatomy

Aug 16, 2022

Has a Superintellect Monkeyed With Our Universe’s Physics?

Posted by in categories: alien life, chemistry, physics

In this second portion of a talk at the Dallas Conference on Science and Faith (2021), philosopher Steve Meyer discusses the ways in which groundbreaking astronomer Fred Hoyle (1915–2001) dealt with the fact that the universe seems fine-tuned for life. Hoyle’s widely cited comment on the subject was “A commonsense interpretation of the facts suggests that a superintellect has monkeyed with physics, as well as chemistry and biology, and that there are no blind forces worth speaking about in nature.” That was an unsettling idea for Hoyle, who was a well-known atheist, and he certainly sought ways around it. How did he fare?

Aug 16, 2022

This Artificial Neuron Uses Dopamine to Communicate With Brain Cells

Posted by in categories: biotech/medical, chemistry, cyborgs, robotics/AI

The chip is an artificial neuron, but nothing like previous chips built to mimic the brain’s electrical signals. Rather, it adopts and adapts the brain’s other communication channel: chemicals.

Called neurotransmitters, these chemicals are the brain’s “natural language,” said Dr. Benhui Hu at Nanjing Medical University in China. An artificial neuron using a chemical language could, in theory, easily tap into neural circuits—to pilot a mouse’s leg, for example, or build an entirely new family of brain-controlled prosthetics or neural implants.

A new study led by Hu and Dr. Xiaodong Chen at Nanyang Technological University, Singapore, took a lengthy stride towards seamlessly connecting artificial and biological neurons into a semi-living circuit. Powered by dopamine, the setup wasn’t a simple one-way call where one component activated another. Rather, the artificial neuron formed a loop with multiple biological counterparts, pulsing out dopamine while receiving feedback to change its own behavior.