Switchable graphene nanoribbon flips its twist direction using a chiral solvent
Researchers at Nagoya University have synthesized a helical graphene nanoribbon (GNR) whose handedness can be switched on demand. The team built what they call a poly[4]helicene nanoribbon, a ladder-type polymer made entirely of [4]helicene subunits, and showed that dissolving it in a chiral solvent locks the ribbon into a single, uniform spiral direction, right- or left-handed depending on which mirror-image form of the solvent is used.
Helical GNRs have drawn interest as a route to chiral carbon materials for optical and electronic devices, but achieving a controllable, switchable twist has been an unsolved problem. [4]Helicene, a four-ring helicene unit, was considered too configurationally unstable for this purpose, since it flips its own handedness too quickly to hold a fixed twist on its own. The team took the opposite approach: rather than avoiding this instability, they built a long ladder-polymer chain entirely out of [4]helicene units, fusing them together through quantitative intramolecular multifold cyclization of a nonhelical precursor polymer. Because each subunit is mechanically coupled to its neighbors along the rigid, constrained framework, the helicity inversions of adjacent units became correlated, producing long, interconverting sequences of right- (P) and left- (M) handed [4]helicene subunits rather than random, uncorrelated flipping.
Source: https://www.graphene-info.com/switchable-graphene-nanoribbon-flips-its-twist-direction-using-chiral-solvent
Anyone can join.
Anyone can contribute.
Anyone can become informed about their world.
"United We Stand" Click Here To Create Your Personal Citizen Journalist Account Today, Be Sure To Invite Your Friends.
Before It’s News® is a community of individuals who report on what’s going on around them, from all around the world. Anyone can join. Anyone can contribute. Anyone can become informed about their world. "United We Stand" Click Here To Create Your Personal Citizen Journalist Account Today, Be Sure To Invite Your Friends.
LION'S MANE PRODUCT
Try Our Lion’s Mane WHOLE MIND Nootropic Blend 60 Capsules
Mushrooms are having a moment. One fabulous fungus in particular, lion’s mane, may help improve memory, depression and anxiety symptoms. They are also an excellent source of nutrients that show promise as a therapy for dementia, and other neurodegenerative diseases. If you’re living with anxiety or depression, you may be curious about all the therapy options out there — including the natural ones.Our Lion’s Mane WHOLE MIND Nootropic Blend has been formulated to utilize the potency of Lion’s mane but also include the benefits of four other Highly Beneficial Mushrooms. Synergistically, they work together to Build your health through improving cognitive function and immunity regardless of your age. Our Nootropic not only improves your Cognitive Function and Activates your Immune System, but it benefits growth of Essential Gut Flora, further enhancing your Vitality.
Our Formula includes: Lion’s Mane Mushrooms which Increase Brain Power through nerve growth, lessen anxiety, reduce depression, and improve concentration. Its an excellent adaptogen, promotes sleep and improves immunity. Shiitake Mushrooms which Fight cancer cells and infectious disease, boost the immune system, promotes brain function, and serves as a source of B vitamins. Maitake Mushrooms which regulate blood sugar levels of diabetics, reduce hypertension and boosts the immune system. Reishi Mushrooms which Fight inflammation, liver disease, fatigue, tumor growth and cancer. They Improve skin disorders and soothes digestive problems, stomach ulcers and leaky gut syndrome. Chaga Mushrooms which have anti-aging effects, boost immune function, improve stamina and athletic performance, even act as a natural aphrodisiac, fighting diabetes and improving liver function. Try Our Lion’s Mane WHOLE MIND Nootropic Blend 60 Capsules Today. Be 100% Satisfied or Receive a Full Money Back Guarantee. Order Yours Today by Following This Link.
| Visits: | 1,831,013,543 |
| Stories: | 8,699,065 |
Whistler Blowers, Insiders
