Numerous peptides derived from naturally occurring proteins or de novo designed have been found to self-assemble into various nanostructures.These well-defined nanostructures have shown great potential for a variety o...Numerous peptides derived from naturally occurring proteins or de novo designed have been found to self-assemble into various nanostructures.These well-defined nanostructures have shown great potential for a variety of biomedical and biotechnological applications.In particular,surfactant-like peptides(SLPs)have distinctive advantages in their length,aggregating ability,and water solubility.In this article,we report recent advances in the mechanistic understanding of the self-assembly principles of SLPs and in their applications,most of which have been made in our laboratory.Hydrogen bonding between peptide backbones,hydrophobic interaction between hydrophobic side chains,and electrostatic repulsion between charged head groups all have roles in mediating the self-assembly of SLPs;the final self-assembled nanostructures are therefore dependent on their interplay.SLPs have shown diverse applications ranging from membrane protein stabilization and antimicrobial/anticancer agents to nanofabrication and biomineralization.Future advances in the self-assembly of SLPs will hinge on their large-scale production,the design of new functional SLPs with targeted properties,and the exploitation of new or improved applications.展开更多
Superhydrophobic and superhydrophilic surfaces have been extensively inves- tigated due to their importance for industrial applications. It has been reported, however, that superhydrophobic surfaces are very sensitive...Superhydrophobic and superhydrophilic surfaces have been extensively inves- tigated due to their importance for industrial applications. It has been reported, however, that superhydrophobic surfaces are very sensitive to heat, ultraviolet （UV） light, and electric potential, which interfere with their long-term durability. In this study, we introduce a novel approach to achieve robust superhydrophobic thin films by designing architecture-defined complex nanostructures. A family of ZnO hollow microspheres with controlled constituent architectures in the morphologies of 1D nanowire networks, 2D nanosheet stacks, and 3D mesoporous nanoball blocks, respectively, was synthesized via a two-step self-assembly approach, where the oligomers or the constituent nanostructures with specially designed structures are first formed from surfactant templates, and then further assembled into complex morphologies by the addition of a second co-surfactant. The thin films composed of two-step synthesized ZnO hollow microspheres with different architectures presented superhydrophobicities with contact angles of 150°-155°, superior to the contact angle of 103° for one-step synthesized ZnO hollow microspheres with smooth and solid surfaces. Moreover, the robust superhydrophobicity was further improved by perfluorinated silane surface modification. The perfluorinated silane treated ZnO hollow microsphere thin films maintained excellent hydrophobicity even after 75 h of UV irradiation. The realization of environmentally durable promising solution for their long-term irradiations. superhydrophobic surfaces provides a service under UV or strong solar light展开更多
The synthesis and self-assembly of tetragonal phase-containing L10-Fe55Pt45 nanorods with high coercive field is described. The experimental procedure resulted in a tetragonal/cubic phase ratio close to 1：1 for the a...The synthesis and self-assembly of tetragonal phase-containing L10-Fe55Pt45 nanorods with high coercive field is described. The experimental procedure resulted in a tetragonal/cubic phase ratio close to 1：1 for the as-synthesized nanoparticles. Using different surfactant/solvent proportions in the process allowed control of particle morphology from nanospheres to nanowires. Monodisperse nanorods with lengths of 60 ＋ 5 nm and diameters of 2-3 nm were self-assembled in a perpendicular oriented array onto a substrate surface using hexadecylamine as organic spacer. Magnetic alignment and properties assigned, respectively, to the shape anisotropy and the tetragonal phase suggest that the self-assembled materials are a strong candidate to solve the problem of random magnetic alignment observed in FePt nanospheres leading to applications in ultrahigh magnetic recording （UHMR） systems capable of achieving a performance of the order of terabits/in2.展开更多
基金supported by the National Natural Science Foundation of China(21373270,21033005)the Natural Science Foundation of Shandong Province(JQ201105).the support of the Program for New Century Excellent Talents in University(NCET-11-0735)
文摘Numerous peptides derived from naturally occurring proteins or de novo designed have been found to self-assemble into various nanostructures.These well-defined nanostructures have shown great potential for a variety of biomedical and biotechnological applications.In particular,surfactant-like peptides(SLPs)have distinctive advantages in their length,aggregating ability,and water solubility.In this article,we report recent advances in the mechanistic understanding of the self-assembly principles of SLPs and in their applications,most of which have been made in our laboratory.Hydrogen bonding between peptide backbones,hydrophobic interaction between hydrophobic side chains,and electrostatic repulsion between charged head groups all have roles in mediating the self-assembly of SLPs;the final self-assembled nanostructures are therefore dependent on their interplay.SLPs have shown diverse applications ranging from membrane protein stabilization and antimicrobial/anticancer agents to nanofabrication and biomineralization.Future advances in the self-assembly of SLPs will hinge on their large-scale production,the design of new functional SLPs with targeted properties,and the exploitation of new or improved applications.
基金Acknowledgements This work was supported by the Australian Research Council （ARC） Discovery Project No. DP1096546. ZQS was supported by an ARC Postdoctoral （APD） Research Fellowship and a University of Wollongong （UOW） Vice-chancellor＇s Research Fellowship. TL acknowledges the support of a University of Queensland （UQ） Postdoctoral Fellowship. KSL and LJ appreciate the financial support of the National Natural Science Foundation of China （Nos. 21273016, 21001013, and 20974113）, the National Basic Research Program of China （No. 2013CB933003）, the Program for New Century Excellent Talents in Universities, Beijing Natural Science Foundation （No. 2122035）, and the Key Research Program of the Chinese Academy of Sciences （No. KJZDEW-M01）.
文摘Superhydrophobic and superhydrophilic surfaces have been extensively inves- tigated due to their importance for industrial applications. It has been reported, however, that superhydrophobic surfaces are very sensitive to heat, ultraviolet （UV） light, and electric potential, which interfere with their long-term durability. In this study, we introduce a novel approach to achieve robust superhydrophobic thin films by designing architecture-defined complex nanostructures. A family of ZnO hollow microspheres with controlled constituent architectures in the morphologies of 1D nanowire networks, 2D nanosheet stacks, and 3D mesoporous nanoball blocks, respectively, was synthesized via a two-step self-assembly approach, where the oligomers or the constituent nanostructures with specially designed structures are first formed from surfactant templates, and then further assembled into complex morphologies by the addition of a second co-surfactant. The thin films composed of two-step synthesized ZnO hollow microspheres with different architectures presented superhydrophobicities with contact angles of 150°-155°, superior to the contact angle of 103° for one-step synthesized ZnO hollow microspheres with smooth and solid surfaces. Moreover, the robust superhydrophobicity was further improved by perfluorinated silane surface modification. The perfluorinated silane treated ZnO hollow microsphere thin films maintained excellent hydrophobicity even after 75 h of UV irradiation. The realization of environmentally durable promising solution for their long-term irradiations. superhydrophobic surfaces provides a service under UV or strong solar light
文摘The synthesis and self-assembly of tetragonal phase-containing L10-Fe55Pt45 nanorods with high coercive field is described. The experimental procedure resulted in a tetragonal/cubic phase ratio close to 1：1 for the as-synthesized nanoparticles. Using different surfactant/solvent proportions in the process allowed control of particle morphology from nanospheres to nanowires. Monodisperse nanorods with lengths of 60 ＋ 5 nm and diameters of 2-3 nm were self-assembled in a perpendicular oriented array onto a substrate surface using hexadecylamine as organic spacer. Magnetic alignment and properties assigned, respectively, to the shape anisotropy and the tetragonal phase suggest that the self-assembled materials are a strong candidate to solve the problem of random magnetic alignment observed in FePt nanospheres leading to applications in ultrahigh magnetic recording （UHMR） systems capable of achieving a performance of the order of terabits/in2.
