Yuan Huang

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Name: 黄远

Organization: Tianjin University

Department: Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering

Title:

TOPICS

Polymer

Stimuli Responsive Polymers PH Responsive Polymers Stimuli Responsive Polymers PH Responsive Polymers

Chemicals
References

Tribological behavior of three-dimensional braided carbon fiber reinforced polyetheretherketone composites

Co-reporter:Xiaowen Qiu;Fang He;Junjiao Li;Lixia Chen

Polymer Composites 2015 Volume 36( Issue 12) pp:2174-2183

Publication Date(Web):

DOI:10.1002/pc.23128

Three-dimensional (3D) braided carbon fiber reinforced polyetheretherketone (denoted as CF_3D/PEEK) composites with various fiber volume fractions were prepared via hybrid woven plus vacuum heat-pressing technology and their tribological behaviors against steel counterpart with different normal loads at dry sliding were investigated. Contrast tribological tests with different lubricants (deionized water and sea water) and counterparts made from different materials (epoxy resin, PEEK) were also conducted. The results showed that the incorporation of 3D braided carbon fiber can greatly improve the tribological properties of PEEK over a certain range of carbon fiber volume fraction (V_f) and an optimum fiber loading of ∼54% exists. The friction coefficient of the CF_3D/PEEK composites decreased from 0.195 to 0.173, while the specific wear rate increased from 1.48 × 10⁻⁷ to 1.78 × 10⁻⁷ mm³ Nm⁻¹ with the normal load increasing from 50 to 150 N. Abrasive mechanism was dominated when the composites sliding with GCr15 steel counterpart under dry and aqueous lubrication conditions. Deionized water and sea water lubricants both significantly reduced the wear of the CF_3D/PEEK composites. When sliding with neat PEEK counterpart, the CF_3D/PEEK composites possess lower friction coefficient than those against epoxy resin and GCr15 steel counterparts. In general, CF_3D/PEEK composites possess excellent tribological properties and comprehensive mechanical performance, which makes it become a potential candidate for special heat-resisting tribological components. POLYM. COMPOS., 36:2174–2183, 2015. © 2014 Society of Plastics Engineers

Controlled delivery of dexamethasone from TiO2 film with nanoporous structure on Ti–25Nb–3Mo–2Sn–3Zr biomedical alloy without polymeric carrier

Co-reporter:Yan Zhang, Fang He, Zuwen Sun, Lijun Li, Yuan Huang

Materials Letters 2014 Volume 128() pp:384-387

Publication Date(Web):1 August 2014

DOI:10.1016/j.matlet.2014.04.149

•Nanoporous TiO2 film on TLM alloy was first fabricated by two-step anodization.•Nanoporous TiO2 film shows excellent properties for drug release application.•Nanoporous TiO2 film has longer drug release duration than similar researches reported before.•Drug loading and release mechanism were explained in this paper.Nanoporous structured TiO2 film on TLM alloy was first fabricated by two-step anodization and used as drug carriers. The nanoporous structured TiO2 film with a thickness of 470 nm was self-organized in electrolyte at a voltage of 30 V, and it possesses higher porosity, smoother surface and better adhesion with TLM alloy matrix compared with TiO2 nanotube prepared by one-step anodization. At the same time, it has better hydrophily than TLM alloy matrix. Dexamethasone (DXM) was successfully loaded onto the nanoporous film via a vacuum assisted method, and drug loading amount can be adjusted easily. The nanoporous structured film loaded with DXM has presented excellent sustained drug release effect, and kept intact microstructure after drug release in vitro test, indicating that TLM alloy coated with nanoporous TiO2 film has potential application in polymer-free drug eluting stents.

Self-organizing evolution of anodized oxide films on Ti-25Nb-3Mo-2Sn-3Zr alloy and hydrophilicity

Co-reporter:Fang He 何芳;Lijun Li 李立军;Lixia Chen 陈利霞

Transactions of Tianjin University 2014 Volume 20( Issue 2) pp:97-102

Publication Date(Web):2014 April

DOI:10.1007/s12209-014-2259-x

In the present work, hierarchical nanostructured titanium dioxide (TiO2) films were fabricated on Ti-25Nb-3Mo-2Sn-3Zr (TLM) alloy for biomedical applications via one-step anodization process in ethylene glycolbased electrolyte containing 0.5wt% NH4F. The nanostructured TiO2 films exhibited three distinct types depending on the anodization time: top irregular nanopores (INP)/beneath regular nanopores (RNP), top INP/middle regular nanotubes (RNT)/bottom RNP and top RNT with underlying RNP. The evolution of the nanostructured TiO2 films with anodization time demonstrated that self-organizing nanopores formed at the very beginning and individual nanotubes originated from underlying nanopore dissolution. Furthermore, a mod`ified two-stage self-organizing mechanism was introduced to illustrate the growth of the nanostructured TiO2 films. Compared with TLM titanium alloy matrix, the TiO2 films with special nano-structure hold better hydrophilicity and higher specific surface area, which lays the foundation for their biomedical applications.