Janus particles,in which two distinct compositions are integrated,have attracted considerable interest for their potential multi-functionalities and synergistic effects.Although seed-mediated growth appears to be a su...Janus particles,in which two distinct compositions are integrated,have attracted considerable interest for their potential multi-functionalities and synergistic effects.Although seed-mediated growth appears to be a suitable strategy that meets the stringent specifications for obtaining Janus particles,it is inapplicable to guide the growth of two crystalline components with different crystal structures.Herein,the formation of Janus particles via phase segregation is proposed.As proof-of-concept,promising photon conversion materials,ScF_(3)and lanthanide(Ln)fluorides,with great differences in structure,were chosen to build a series of Janus particles.Interestingly,using heavy(Lu,Yb,Dy and Tb)and light(Pr,Nd,Sm,Eu and Gd)lanthanides,ScF_(3)-LiLnF_(4)and ScF_(3)-LnF_(3)were formed,respectively.Time-dependent reaction studies indicate that phase segregation paves the way for the formation of these Janus nanoparticles(NPs),and this speculation is further confirmed by in situ transmission electron microscopy observations.These investigations provide new insights for the synthesis of heterostructured materials.展开更多
Parvovirus B19,a small,single-stranded DNA virus,occurs worldwide in sporadic cases or within clustered outbreaks.There are three genotypes within the Erythroparvovirus genus.Parvovirus B19 genotype 1 is the predomina...Parvovirus B19,a small,single-stranded DNA virus,occurs worldwide in sporadic cases or within clustered outbreaks.There are three genotypes within the Erythroparvovirus genus.Parvovirus B19 genotype 1 is the predominant one,while genotypes 2 and 3 are found much less frequently.1 The main route of transmission is via respiratory particles.It shows a variety of clinical presentations in immunocompetent patients.Most of them report non-specific symptoms whereas 25%of them will be asymptomatic.展开更多
To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]tha...To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]that“...the behavior of large and complex aggregates of elementary particles,it turns out,is not to be understood in terms of a simple extrapolation of the properties of a few particles.Instead,at each level of complexity entirely new properties appear...”.The concept“More is Different”emphasized the significance of emergence in complex systems,where emergent behaviors and properties that cannot be found from the individual parts.Professor Anderson’s own research in condensed matter physics also reflects the importance of emergence and complexity science.He was most concerned about how complex phenomena emerge from simple systems[2,3].展开更多
基金supported by NSFC(No.21425101,21371011,21331001,21590791)MOST of China(2014CB643800,2017YFA0205101).
文摘Janus particles,in which two distinct compositions are integrated,have attracted considerable interest for their potential multi-functionalities and synergistic effects.Although seed-mediated growth appears to be a suitable strategy that meets the stringent specifications for obtaining Janus particles,it is inapplicable to guide the growth of two crystalline components with different crystal structures.Herein,the formation of Janus particles via phase segregation is proposed.As proof-of-concept,promising photon conversion materials,ScF_(3)and lanthanide(Ln)fluorides,with great differences in structure,were chosen to build a series of Janus particles.Interestingly,using heavy(Lu,Yb,Dy and Tb)and light(Pr,Nd,Sm,Eu and Gd)lanthanides,ScF_(3)-LiLnF_(4)and ScF_(3)-LnF_(3)were formed,respectively.Time-dependent reaction studies indicate that phase segregation paves the way for the formation of these Janus nanoparticles(NPs),and this speculation is further confirmed by in situ transmission electron microscopy observations.These investigations provide new insights for the synthesis of heterostructured materials.
文摘Parvovirus B19,a small,single-stranded DNA virus,occurs worldwide in sporadic cases or within clustered outbreaks.There are three genotypes within the Erythroparvovirus genus.Parvovirus B19 genotype 1 is the predominant one,while genotypes 2 and 3 are found much less frequently.1 The main route of transmission is via respiratory particles.It shows a variety of clinical presentations in immunocompetent patients.Most of them report non-specific symptoms whereas 25%of them will be asymptomatic.
文摘To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]that“...the behavior of large and complex aggregates of elementary particles,it turns out,is not to be understood in terms of a simple extrapolation of the properties of a few particles.Instead,at each level of complexity entirely new properties appear...”.The concept“More is Different”emphasized the significance of emergence in complex systems,where emergent behaviors and properties that cannot be found from the individual parts.Professor Anderson’s own research in condensed matter physics also reflects the importance of emergence and complexity science.He was most concerned about how complex phenomena emerge from simple systems[2,3].
