Biomedical subjects

Z Ryan Tian

Publications and source records attributed to Z Ryan Tian.

5 recordsLinked to original sources

PubMed2006

Multifunctional, catalytic nanowire membranes and the membrane-based 3D devices.

Making large-scale, multifunctional, paper-like, free-standing membranes (FSM) and the FSM-based 3D macroscopic devices purely from long inorganic functional nanowires is challenging in many nanomaterials systems. Here we report synthesis of long nanowires of the catalytic titanate for direct fabrications of the FSM and the FSM-based 3D devices that are among the first to show unusual potentials in photocatalysis, write-erase-rewrite, microfiltration, and controlled release.

Letter↗

PubMed2006

Site-specific nucleation and growth kinetics in hierarchical nanosyntheses of branched ZnO crystallites.

Here we report a site-specific sequential nucleation and growth route to the systematic building of hierarchical, complex, and oriented ZnO micro/nanostructures in solution nanosynthesis. Structures and morphologies of the products were confirmed by results from X-ray diffraction and scanning electron microscopy studies. The organic structure-directing agents (SDAs), diaminopropane and citrate, are found to play different roles in controlling the evolution of these new morphologies. Through the selective adsorptions of SDAs on different crystal facets of the primary ZnO rods, we have alternated the hierarchical growth of secondary and tertiary new complex nanostructures. Roles of the SDA concentration, nucleation time, and growth kinetics in the solution hierarchical ZnO nanosyntheses have all been systematically investigated.

Journal Article↗

PubMed2006

Hexagonal and prismatic nanowalled ZnO microboxes.

We hereby report hydrothermal syntheses of new microstructures of semiconducting ZnO. Single-crystalline prismatic ZnO microboxes formed by nanowalls and hexagonal hollow microdisks closed by plates with micron-sized inorganic fullerene-like structures have been made in a base-free medium through a one-step hydrothermal synthesis with the help of n-butanol (NB). Structures and morphologies of the products were confirmed by results from powder X-ray diffraction and scanning electron microscopy. NB has been found to play a crucial role in the growth of these hollow structures. It is indicated that these hollow ZnO crystals were grown from redissolution of interiors. These ZnO microboxes exhibit a band emission in the visible range, implying the possession of a high content of defects.

Journal Article↗

PubMed2006

One-pot redox syntheses of heteronanostructures of Ag nanoparticles on MoO3 nanofibers.

A new one-pot redox route has been developed for simultaneous syntheses of Ag nanoparticles on MoO(3) nanofibers. Four different synthetic reactions that have been integrated into the one-pot synthesis include the oxidation of [Na(H(2)O)(2)](0.25)MoO(3) bronze, the reduction of silver ions, and the in situ simultaneous growth of the self-organized Ag nanoparticles and the MoO(3) nanofibers. This new strategy can be generally applicable to grafting various metal nanoparticles on nanofibers for new catalysis-related applications.

Letter↗

PubMed2006

Solid-state transformation from self-assembled nanosheets into ordered nanorods.

ZnO nanostructures, with a rich collection of morphologies and spatial organizations useful in a variety of important applications, have been synthesized mainly via solution- and gas-phase approaches. Here we report a simple calcination to convert self-assembled nanosheets of hydrated ZnO, each about 50 nm thick, to ordered ZnO nanorods (approximately 200 nm in diameter and approximately 4 microm in length) on glass substrates or on ZnO microcrystals through a quick calcination at 400 degrees C in air. This work is among the first using a pure solid-state transformation to convert one ordered precursory nanostructure to another with different morphology and spatial organization. Both the ordered nanorods and the self-assembled nanosheets could be useful in important applications including catalysis, sensing, gas storage, and drug delivery.

Journal Article↗