The dynamics of two-dimensional rigid circles filled with chiral active particles are investigated by employing the overdamped Langevin dynamics simulations. Unidirectional rotation of rigid circles is observed, and t...The dynamics of two-dimensional rigid circles filled with chiral active particles are investigated by employing the overdamped Langevin dynamics simulations. Unidirectional rotation of rigid circles is observed, and the rotational angular velocity（ω） relies mainly on the length（l）, the number（nB）, and tilt angle（γ） of boards, and the angular velocity（ω）and area fraction（ρ） of chiral active particles. There are optimum values for these parameters at which the average angular velocity of circle reaches its maximum. The center-of-mass mean square displacement for circles drops by about two orders of magnitude for large angular velocity ω of chiral active particles with oscillations in the short-time regime. Our work demonstrates that nanofabricated objects with suitable designs immersed in a bath of chiral active particles can extract and rectify energy in a unidirectional motion.展开更多
Enantiomeric discrimination plays a crucial role in various scientific domains,including analytical chemistry,chemical biology,pharmaceuticals,and pesticide research.A variety of theoretical frameworks and chiroptical...Enantiomeric discrimination plays a crucial role in various scientific domains,including analytical chemistry,chemical biology,pharmaceuticals,and pesticide research.A variety of theoretical frameworks and chiroptical spectroscopic methods,including optical rotation and circular dichroism,have been devised to identify and quantify enantiomers.Generally,circularly polarized light is utilized to determine the absolute configuration and composition of enantiomers.However,these techniques are not suitable for racemic mixtures or substances with minimal optical activity.Herein,we propose that ultraviolet-visible-absorption chiral anisotropy(UV-Vis-ChA)of chiral nanostructured Au particles(CNAPs)can be utilized for enantiomeric discrimination,using amino acids as a model system.The CNAPs,synthesized via a seed-mediated method using chiral glutathione as the symmetry-breaking agent,exhibit a helical nanocubic structure.Upon the addition of amino acid enantiomers to the CNAPs solution,the decrease in the UV-Vis absorbance of CNAPs solution,with varying rates,was induced by enantiomers with different enantiomeric excess(ee)values.The rate constant of absorbance decrease(k_(Δ))was proportional to the ee values,regardless of polarity,size,or chromophore type.It is speculated that the UV-Vis-ChA results from the selective aggregation of CNAPs due to the formation of coordination bonds with enantiomers which is driven by their spin polarizations.This work provides a cost-effective,broad-spectrum,and quantitative approach to enantiomeric discrimination.展开更多
The enantiospecific detection of the chirality of substances at the nanoscale has attracted significant attention due to its importance in materials science,chemistry,and biology.This study presents,to our knowledge,a...The enantiospecific detection of the chirality of substances at the nanoscale has attracted significant attention due to its importance in materials science,chemistry,and biology.This study presents,to our knowledge,a novel method for chirality detection based on transverse optical torque(OT),which leverages the transverse rotation of achiral particles induced by the transfer of chirality from the chiral particle within interference fields formed by the incident light without spin angular momentum(SAM).We demonstrate,both numerically and analytically,that by modulating the chirality of the chiral particle within a dimer system,it is possible to achieve the transfer of local SAM to the gold particle,thereby generating a transverse OT perpendicular to the light propagation direction.Furthermore,by adjusting the orientation of linear polarization in the excitation field,the respective contributions of electric and magnetic responses to the chirality-transfer-induced transverse OT can be exclusively observed separately,providing deeper insights into the underlying physical mechanisms.More importantly,the transverse OT exhibits an approximately linear dependence on the chirality parameter of the chiral particle,enabling enantiospecific detection of nanosamples.By replacing gold nanoparticles with suitable highrefractive-index dielectric materials such as germanium,the induced transverse magnetic dipolar OT can be further enhanced by more than two orders of magnitude,significantly improving the sensitivity of chirality detection and making it possible to detect weak chiral signals with exceptional precision.This work broadens the application scope of OTs in chirality detection and highlights the potential of chirality transfer mechanisms for advanced optical manipulation and the identification and analysis of chiral substances.展开更多
The chiral geometry of multiple chiral doublet bands with identical configuration is discussed for different triaxial deformation parameters γ in the particle rotor model with πh11/2×γh11/2^-1.The energy spect...The chiral geometry of multiple chiral doublet bands with identical configuration is discussed for different triaxial deformation parameters γ in the particle rotor model with πh11/2×γh11/2^-1.The energy spectra,electromagnetic transition probabilities B（M1） and B（E2）,angular momenta,and K-distributions are studied.It is demonstrated that the chirality still remains not only in the yrast and yrare bands,but also in the two higher excited bands whenγ deviates from 30°.The chiral geometry relies significantly on γ,and the chiral geometry of the two higher excited partner bands is not as good as that of the yrast and yrare doublet bands.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.21674096 and 21873082)
文摘The dynamics of two-dimensional rigid circles filled with chiral active particles are investigated by employing the overdamped Langevin dynamics simulations. Unidirectional rotation of rigid circles is observed, and the rotational angular velocity（ω） relies mainly on the length（l）, the number（nB）, and tilt angle（γ） of boards, and the angular velocity（ω）and area fraction（ρ） of chiral active particles. There are optimum values for these parameters at which the average angular velocity of circle reaches its maximum. The center-of-mass mean square displacement for circles drops by about two orders of magnitude for large angular velocity ω of chiral active particles with oscillations in the short-time regime. Our work demonstrates that nanofabricated objects with suitable designs immersed in a bath of chiral active particles can extract and rectify energy in a unidirectional motion.
基金supported by the National Key R&D Program of China(No.2021YFA1200301,S.A.C.)the National Natural Science Foundation of China(No.21931008,S.A.C.)the Shanghai Pilot Program for Basic Research-Shanghai Jiao Tong University(No.21TQ1400219).
文摘Enantiomeric discrimination plays a crucial role in various scientific domains,including analytical chemistry,chemical biology,pharmaceuticals,and pesticide research.A variety of theoretical frameworks and chiroptical spectroscopic methods,including optical rotation and circular dichroism,have been devised to identify and quantify enantiomers.Generally,circularly polarized light is utilized to determine the absolute configuration and composition of enantiomers.However,these techniques are not suitable for racemic mixtures or substances with minimal optical activity.Herein,we propose that ultraviolet-visible-absorption chiral anisotropy(UV-Vis-ChA)of chiral nanostructured Au particles(CNAPs)can be utilized for enantiomeric discrimination,using amino acids as a model system.The CNAPs,synthesized via a seed-mediated method using chiral glutathione as the symmetry-breaking agent,exhibit a helical nanocubic structure.Upon the addition of amino acid enantiomers to the CNAPs solution,the decrease in the UV-Vis absorbance of CNAPs solution,with varying rates,was induced by enantiomers with different enantiomeric excess(ee)values.The rate constant of absorbance decrease(k_(Δ))was proportional to the ee values,regardless of polarity,size,or chromophore type.It is speculated that the UV-Vis-ChA results from the selective aggregation of CNAPs due to the formation of coordination bonds with enantiomers which is driven by their spin polarizations.This work provides a cost-effective,broad-spectrum,and quantitative approach to enantiomeric discrimination.
基金National Natural Science Foundation of China(12274074,12134013,12174076)Natural Science Foundation of Jiangsu Province(BK20242024)+1 种基金Natural Science Foundation of Guangxi(2023GXNSFFA026002)Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX24_0381)。
文摘The enantiospecific detection of the chirality of substances at the nanoscale has attracted significant attention due to its importance in materials science,chemistry,and biology.This study presents,to our knowledge,a novel method for chirality detection based on transverse optical torque(OT),which leverages the transverse rotation of achiral particles induced by the transfer of chirality from the chiral particle within interference fields formed by the incident light without spin angular momentum(SAM).We demonstrate,both numerically and analytically,that by modulating the chirality of the chiral particle within a dimer system,it is possible to achieve the transfer of local SAM to the gold particle,thereby generating a transverse OT perpendicular to the light propagation direction.Furthermore,by adjusting the orientation of linear polarization in the excitation field,the respective contributions of electric and magnetic responses to the chirality-transfer-induced transverse OT can be exclusively observed separately,providing deeper insights into the underlying physical mechanisms.More importantly,the transverse OT exhibits an approximately linear dependence on the chirality parameter of the chiral particle,enabling enantiospecific detection of nanosamples.By replacing gold nanoparticles with suitable highrefractive-index dielectric materials such as germanium,the induced transverse magnetic dipolar OT can be further enhanced by more than two orders of magnitude,significantly improving the sensitivity of chirality detection and making it possible to detect weak chiral signals with exceptional precision.This work broadens the application scope of OTs in chirality detection and highlights the potential of chirality transfer mechanisms for advanced optical manipulation and the identification and analysis of chiral substances.
基金Supported by Plan Project of Beijing College Students' Scientific Research and Entrepreneurial Action,Major State 973 Program of China(2013CB834400)National Natural Science Foundation of China(11175002,11335002,11375015,11461141002)+2 种基金National Fund for Fostering Talents of Basic Science(NFFTBS)(J1103206)Research Fund for Doctoral Program of Higher Education(20110001110087)China Postdoctoral Science Foundation(2015M580007)
文摘The chiral geometry of multiple chiral doublet bands with identical configuration is discussed for different triaxial deformation parameters γ in the particle rotor model with πh11/2×γh11/2^-1.The energy spectra,electromagnetic transition probabilities B（M1） and B（E2）,angular momenta,and K-distributions are studied.It is demonstrated that the chirality still remains not only in the yrast and yrare bands,but also in the two higher excited bands whenγ deviates from 30°.The chiral geometry relies significantly on γ,and the chiral geometry of the two higher excited partner bands is not as good as that of the yrast and yrare doublet bands.
