Sentences with phrase «hydrogen bonds for»

This particular discovery originated in prior work at Rochester that demonstrated quantum dots could be excellent catalysts for creating hydrogen - hydrogen bonds for solar fuel applications.

White's group is working on catalysts that can modify a wider range of amino acids, particularly those with electron - rich aromatic functionality, which compete with the carbon - hydrogen bonds for oxidation using the current catalyst.

Not exact matches

BY AFFECTING the way molecules bind to each other, hydrogen bonds are responsible for water's high boiling point, ice's propensity to float and DNA's signature double helix.

In principle, the wave function, denoted by Greek letter psi, can be used to reveal these energy levels for any given atom or molecule, although in practice this has only been done for the very simplest — the hydrogen atom and molecule (made of two hydrogen atoms bonded together).

VHTR plants could even produce hydrogen for fuel using high - temperature steam electrolysis, which breaks apart the bonds of water molecules; this process is 50 percent more energy - efficient than existing hydrogen production methods.

For complex reasons involving the atomic bonding properties of hydrogen, that configuration isn't conducive to electrolysis.

For example, in water (H2O) the sole oxygen atom is bound to two hydrogen atoms, and the two bonds constantly change in length.

So researchers are looking for materials that can stabilise hydrogen by weakly bonding with it.

Providing hydrogen for the process is expensive, and as oils get more sour, higher pressures and more stable catalysts are needed to break the sulfur bonds.

This lack of oxygen enables them to maintain their hydrogen - carbon bonds, a necessary ingredient for the production of oil and gas.

This technology bonds hydrogen molecules within a carrier oil, eliminating the need for expensive pressure storage solutions or refrigeration units for liquid hydrogen.

For example, instead of stealing an electron from double - bonded carbons or a nearby propagating chain, the carbon atom with the free radical sometimes steals an entire hydrogen atom from another chain end.

For example, questions such as «What happens to the rest of the bonds in a chain of carbon rings if you pinch a hydrogen atom off the end?»

For example, the hydrogen bonds that connect water molecules to one another are non-covalent, breaking and reforming constantly to give rise to the fluid properties of water.

«Most self - healing polymers form hydrogen bonds or metal - ligand coordination, but these aren't suitable for ionic conductors,» Wang says.

The scientists were now able for the first time to empirically observe how the acetone molecules linked tightly to the chloroform molecules via hydrogen bonding.

The researchers compared the effect of two different substrates on the growth of the phosphorene nanoflake — a copper substrate, commonly used for growing graphene, which bonds with the phosphorene through strong chemical processes, and a hexagonal hydrogen boron nitride (h - BN) substrate that couples with the phosphorene via weak van der Waals bonds.

Water, for example, with one oxygen and two hydrogen atoms, can form two hydrogen bonds per molecule.

«It opens the doors to using hydrogen bonds to make surfaces hydrophilic, or attracted to water, and to (template) these surfaces for the selective absorption of other molecules possessing fundamental similarities to water,» Mavrikakis says.

As a result, hydrogen has been a testing ground for theories of the chemical bond since the birth of quantum mechanics a century ago.

It is fully implemented with Leontis and Westhof's (RNA (2001) 7, 499 - 512), convention for the edge - to - edge hydrogen bonding interactions.

Aspirin, for example, contains just 21 atoms (nine carbons, eight hydrogens and four oxygens) bonded together to form a particular shape.

Among the areas of research that inspire Dr. Cui are: the development of new technologies to further the development of electric transportation; creating new battery chemistry for grid - scale storage at ultra-low cost; and harnessing low - cost technologies for the development of catalysts for efficient carbon dioxide reduction and conversion into highly valuable products and inert carbon - hydrogen bond activation.

National University of Singapore (NUS) chemists have developed a light enhanced, nickel catalysed method for carbon - hydrogen (C - H) bond functionalisat...

Thus, we designed and synthesized new molecular architectures based on the 3D Janus tecton concept, suitable for self - assembly on surface by supramolecular interactions such as coordination, halogen bond or hydrogen bond.3 Here we present two different model pyridyl end - capped molecules: the pedestal P1, and the naked pillar NP pedestal incorporating a cyclophane core.

For example, on the rhodium catalysts, the team's calculations showed that the carbon - carbon and carbon - hydrogen bond scissions are competitive, regardless of the rhodium particle size.

We report on the use of the hydrogen bond acceptor properties of some phosphorus - containing functional groups for the assembly of a series of [2] rotaxanes.

The chemical bonds in hydrogen gas, for example, could power fuel cells, internal combustion engines or generators.

For hydrogen in Earth's early history to have arrived and stayed put in great enough amounts to bond with the oxygen in Earth's atmosphere, it must have been attached to a «carrier» — another atom that bound it into a molecule.

The dotted lines represent distances for the formation of hydrogen bonds.

For instance, the calcium hydride molecular ion (made of one calcium ion and one hydrogen ion bonded together) used by NIST in their experiments has 100 possible rotational states.

He is noted for gaining acceptance for the theme of weak hydrogen bonding among chemists and crystallographers.

This type of bonding alone, however, was not sufficient for stability; when the hydrogen molecules were removed from the cage, the H2S molecule framework collapsed.

It has also been suggested for serine proteases and other enzymes that binding interactions away from the site of chemical transformation position the substrate such that active site hydrogen bonds are prevented from achieving their optimal length in the ground state.

For example, the hydrogen bonding interaction between the phenolic — OH and the o - methoxy groups in curcumin influences the O - H bond energy and H atom abstraction by free radicals, thus making it a better scavenger of free radicals compared to other curcuminoids such as BDMC.

The powerpoint covers: Boiling point, Solubility and Volatility linked to hydrogen bonding of alcohols Graph drawing task to illustrate BP of alcohols vs alkanes Classifying alcohols into primary, secondary and tertiary alcohols Snap plenary task for alcohols.

For instance, Schoenmann explains, microscopic particulates in the air will form hydrogen bonds with a painting's surface so that «no amount of water or scrubbing will be able to remove that dirt.

Instead of listing the 118 chemical elements by their atomic numbers from # 1, hydrogen to # 118, oganesson, it shows 20 calendar years» worth of investment returns (1998 through 2017 for the recently published 2018 edition) for 10 different asset classes, including both U.S. and international stocks as well as domestic bonds.

Reaching the high pressures required for the normally weaker hydrogen bonds to break water apart requires a very small sample.