نتایج جستجو برای: chirality

تعداد نتایج: 12872  

Journal: :Science 2018
Hanyu Zhu Jun Yi Ming-Yang Li Jun Xiao Lifa Zhang Chih-Wen Yang Robert A Kaindl Lain-Jong Li Yuan Wang Xiang Zhang

Chirality reveals symmetry breaking of the fundamental interaction of elementary particles. In condensed matter, for example, the chirality of electrons governs many unconventional transport phenomena such as the quantum Hall effect. Here we show that phonons can exhibit intrinsic chirality in monolayer tungsten diselenide. The broken inversion symmetry of the lattice lifts the degeneracy of cl...

Journal: :The Journal of chemical physics 2014
Bing-Wei Li Mei-Chun Cai Hong Zhang Alexander V Panfilov Hans Dierckx

Chirality is one of the most fundamental properties of many physical, chemical, and biological systems. However, the mechanisms underlying the onset and control of chiral symmetry are largely understudied. We investigate possibility of chirality control in a chemical excitable system (the Belousov-Zhabotinsky reaction) by application of a chiral (rotating) electric field using the Oregonator mo...

2012
Elisa Frezza Silvia Pieraccini Stefania Mazzini Alberta Ferrarini Gian Piero Spada

The chirality transfer in liquid crystals induced by two helical perylenequinones (namely, the natural compounds cercosporin and phleichrome) was investigated by integrating measurements of helical twisting power with a conformational analysis by DFT calculations and with the prediction of their twisting ability by the surface-chirality method. The two quasi-enantiomeric derivatives induce oppo...

2017
Dong Yang Pengfei Duan Li Zhang Minghua Liu

Transfer of both chirality and energy information plays an important role in biological systems. Here we show a chiral donor π-gelator and assembled it with an achiral π-acceptor to see how chirality and energy can be transferred in a composite donor-acceptor system. It is found that the individual chiral gelator can self-assemble into nanohelix. In the presence of the achiral acceptor, the sel...

2017
Maria A. Castriciano Denis Gentili Andrea Romeo Massimiliano Cavallini Luigi Monsù Scolaro

Chirality is one of the most intriguing properties of matter related to a molecule's lack of mirror symmetry. The transmission of chirality from the molecular level up to the macroscopic scale has major implications in life sciences but it is also relevant for many chemical applications ranging from catalysis to spintronic. These technological applications require an accurate control of morphol...

2017
Ashish B. George Kirill S. Korolev

Short Abstract: Is it better to be leftor right-handed? The answer depends on whether the goal is making a handshake or winning a boxing match. The need for coordination favors the handedness of the majority, but being different could also provide an advantage. The same rules could apply to microbial colonies and cancer tumors. Like humans, cells often have handedness (chirality) that reflects ...

2015
FRANCESCO SOLOMBRINO

We study the discrete-to-continuum limit of the helical XY S -spin system on the lattice Z . We scale the interaction parameters in order to reduce the model to a spin chain in the vicinity of the Landau-Lifschitz point and we prove that at the same energy scaling under which the S -model presents scalar chirality transitions, the cost of every vectorial chirality transition is now zero. In add...

Journal: :Chemical communications 2012
Bilu Liu Wencai Ren Shisheng Li Chang Liu Hui-Ming Cheng

Chirality-controlled synthesis of single-walled carbon nanotubes (SWCNTs) is a prerequisite for their practical applications in electronic and optoelectronic devices. We report here a novel bimetallic CoPt catalyst for the selective growth of high quality SWCNTs with a narrow chirality distribution at relatively high temperatures of 800 °C and 850 °C using atmospheric pressure alcohol chemical ...

Journal: :Optics express 2014
Daniel Lin Jer-Shing Huang

We present a new design of plasmonic nanoantenna with slant gap for optical chirality engineering. At resonance, the slant gap provides highly enhanced electric field parallel to external magnetic field with a phase delay of π/2, resulting in enhanced optical chirality. We show by numerical simulations that upon linearly polarized excitation our nanoantenna can generate near field with enhanced...

Journal: :Organic & biomolecular chemistry 2017
Yuka Amako Shigeru Arai Atsushi Nishida

The transfer of axial chirality of allenes is beginning to be exploited as a powerful method for creating central chirality, particularly through the use of transition metal catalysis. In this communication, the transfer of axial chirality of chiral allenes via nickel-catalysed hydrocyanation is achieved through both regio- and face-selective hydronickelation as well as regioselective reductive...

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