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Full-Text Articles in Engineering
Nanoscale Condensation Of Water On Self-Assembled Monolayers, Michael James, Tamim A. Darwish, Simone Ciampi, Sven O. Sylvester, Zhaoming Zhang, Albert Ng, J Justin Gooding, Tracey L. Hanley
Nanoscale Condensation Of Water On Self-Assembled Monolayers, Michael James, Tamim A. Darwish, Simone Ciampi, Sven O. Sylvester, Zhaoming Zhang, Albert Ng, J Justin Gooding, Tracey L. Hanley
Australian Institute for Innovative Materials - Papers
We demonstrate that water is almost universally present on apparently dry self-assembled monolayers, even on those considered almost hydrophobic by conventional methods such as water contact goniometry. The structure and kinetics of nanoscale water adsorption onto these surfaces were investigated using X-ray and neutron reflectometry, as well as atomic force microscopy. Condensation of water on hydrophilic surfaces under ambient conditions formed a dense sub-nanometre surface layer; the thickness of which increased with exponentially limiting kinetics. Tapping mode AFM measurements show the presence of nanosized droplets that covered a small percentage (∼2%) of the total surface area, and which became fewer …
Mesoporous Silicon Photonic Crystal Microparticles: Towards Single-Cell Optical Biosensors, Bin Guan, Astrid I. Magenau, Krisopher A. Kilian, Simone Ciampi, Katharina Gaus, Peter J. Reece, J Justin Gooding
Mesoporous Silicon Photonic Crystal Microparticles: Towards Single-Cell Optical Biosensors, Bin Guan, Astrid I. Magenau, Krisopher A. Kilian, Simone Ciampi, Katharina Gaus, Peter J. Reece, J Justin Gooding
Australian Institute for Innovative Materials - Papers
In this paper we demonstrate the possibility of modifying porous silicon (PSi) particles with surface chemistry and recognition molecules (antibodies) such that these devices could potentially be used for single-cell identification or sensing. This is achieved by modifying PSi Rugate filters via hydrosilylation with surface chemistry that serves firstly, to protect the silicon surfaces from oxidation; secondly, renders the surfaces resistant to nonspecific adsorption of proteins and cells and thirdly, allows further functionality to be added such as the coupling of antibodies. The surface chemistry remained unchanged after sonication of the PSi to form PSi microparticles. The ability to monitor …
Critical Property In Relaxor-Pbtio3 Single Crystals - Shear Piezoelectric Response, Fei Li, Shujun Zhang, Zhuo Xu, Xiaoyong Wei, Thomas R. Shrout
Critical Property In Relaxor-Pbtio3 Single Crystals - Shear Piezoelectric Response, Fei Li, Shujun Zhang, Zhuo Xu, Xiaoyong Wei, Thomas R. Shrout
Australian Institute for Innovative Materials - Papers
The shear piezoelectric behavior in relaxor-PbTiO 3 (PT) single crystals is investigated with regard to the crystal phase. High levels of shear piezoelectric activity, d 15 or d 24 >2000 pC N -1, are observed for single-domain rhombohedral (R), orthorhombic (O), and tetragonal (T) relaxor-PT crystals. The high piezoelectric response is attributed to a flattening of the Gibbs free energy at compositions close to the morphotropic phase boundaries, where polarization rotation is easily accomplished by applying a perpendicular electric field. The shear piezoelectric behavior of perovskite ferroelectric crystals is discussed with respect to ferroelectric-ferroelectric phase transitions and the dc bias …
Direct Observation Of Nodes And Twofold Symmetry In Fese Superconductor, Canli Song, Yi-Lin Wang, Peng Cheng, Yeping Jiang, Wei Li, Tong Zhang, Zhi Li, Ke He, Lili Wang, Jin-Feng Jia, Hsiang-Hsuan Hung, Congjun Wu, Xu-Cun Ma, Xi Chen, Qi-Kun Xue
Direct Observation Of Nodes And Twofold Symmetry In Fese Superconductor, Canli Song, Yi-Lin Wang, Peng Cheng, Yeping Jiang, Wei Li, Tong Zhang, Zhi Li, Ke He, Lili Wang, Jin-Feng Jia, Hsiang-Hsuan Hung, Congjun Wu, Xu-Cun Ma, Xi Chen, Qi-Kun Xue
Australian Institute for Innovative Materials - Papers
We investigated the electron-pairing mechanism in an iron-based superconductor, iron selenide (FeSe), using scanning tunneling microscopy and spectroscopy. Tunneling conductance spectra of stoichiometric FeSe crystalline films in their superconducting state revealed evidence for a gap function with nodal lines. Electron pairing with twofold symmetry was demonstrated by direct imaging of quasiparticle excitations in the vicinity of magnetic vortex cores, Fe adatoms, and Se vacancies. The twofold pairing symmetry was further supported by the observation of striped electronic nanostructures in the slightly Se-doped samples. The anisotropy can be explained in terms of the orbital-dependent reconstruction of electronic structure in FeSe.
In-Field Jc Improvement By Oxygen-Free Pyrene Gas Diffusion Into Highly Dense Mgb2 Superconductor, Minoru Maeda, Jung Ho Kim, Y Zhao, Yoon-Uk Heo, K Takase, Y Kubota, C Moriyoshi, F Yoshida, Y Kuroiwa, S X. Dou
In-Field Jc Improvement By Oxygen-Free Pyrene Gas Diffusion Into Highly Dense Mgb2 Superconductor, Minoru Maeda, Jung Ho Kim, Y Zhao, Yoon-Uk Heo, K Takase, Y Kubota, C Moriyoshi, F Yoshida, Y Kuroiwa, S X. Dou
Australian Institute for Innovative Materials - Papers
Oxygen-free pyrene gas as a carbon (C) dopant was delinked and incorporated into highly dense MgB2 structure via a gas phase diffusion method. The technique offers the advantages that molecular C is homogeneously distributed into MgB2 and substituted at the boron sites without any severe deterioration of grain connectivity. The C substitution causes a significant shrinkage of the a-lattice parameter and an increase in the lattice strain, resulting in high disorder. The introduction of structural disorder as a result of C doping leads to a considerable enhancement of the in-field critical current density (Jc) and upper critical …
Compact-Designed Supercapacitors Using Free-Standing Single-Walled Carbon Nanotube Films, Zhiqiang Niu, Weiya Zhou, Jun Chen, Guoxing Feng, Hong Li, Wenjun Ma, Jinzhu Li, Haibo Dong, Yan Ren, Duan Zhao, Sishen Xie
Compact-Designed Supercapacitors Using Free-Standing Single-Walled Carbon Nanotube Films, Zhiqiang Niu, Weiya Zhou, Jun Chen, Guoxing Feng, Hong Li, Wenjun Ma, Jinzhu Li, Haibo Dong, Yan Ren, Duan Zhao, Sishen Xie
Australian Institute for Innovative Materials - Papers
We reported the realization of assembling compact-designed supercapacitors using large-scaled freestanding and flexible single-walled carbon nanotube (SWCNT) films as both anode and cathode. A prototype of the processing procedures was developed to obtain the uniform spreading of the SWCNT films onto the separators serving as both electrodes and charge collectors without metallic current collectors, leading to a simplified and lightweight architecture. The area of SWCNT film on a separator can be scaled up and its thickness can be extended. High energy and power densities (43.7 Wh kg-1 and 197.3 kW kg-1, respectively) were achieved from the prepared …
Sinteractive Anodic Powders Improve Densification And Electrochemical Properties Of Bazr0.8y0.2o3-O Electrolyte Films For Anode-Supported Solid Oxide Fuel Cells, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa
Sinteractive Anodic Powders Improve Densification And Electrochemical Properties Of Bazr0.8y0.2o3-O Electrolyte Films For Anode-Supported Solid Oxide Fuel Cells, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa
Australian Institute for Innovative Materials - Papers
The difficult sintering of BaZr0.8Y0.2O3-δ(BZY20) powders makes the fabrication of anode-supported BZY20 electrolyte films complex. Dense BZY20 membranes were successfully fabricated on anode substrates made of sinteractive NiO-BZY20 powders, prepared by a combustion method. With respect to traditional anode substrates made of powders prepared by mechanical mixing, the anode substrates made of the wet-chemically synthesized composite NiO–BZY20 powders significantly promoted the densification of BZY20 membranes: dense BZY20 films were obtained after co-pressing and co-firing at 1300°C, a much lower temperature than those usually needed for densifying BZY20 membranes. Improved electrochemical performance was …
Bazr(0.8)Y(0.2)O(3-Delta)-Nio Composite Anodic Powders For Proton-Conducting Sofcs Prepared By A Combustion Method, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa
Bazr(0.8)Y(0.2)O(3-Delta)-Nio Composite Anodic Powders For Proton-Conducting Sofcs Prepared By A Combustion Method, Lei Bi, Emiliana Fabbri, Ziqi Sun, Enrico Traversa
Australian Institute for Innovative Materials - Papers
BaZr0.8Y0.2O3-∂ (BZY)-NiO composite powders with different BZY-NiO weight ratios were prepared by a combustion method as anodes for proton-conducting solid oxide fuel cells (SOFCs). After heating to 1100°C for 6 h, the composite powders were made of a well-dispersed mixture of two phases, BZY and NiO. Chemical stability tests showed that the BZY-NiO anodic powders had good stability against CO2, whereas comparative tests under the same conditions showed degradation for BaCe0.7Zr0.1Y0.2O3-∂- NiO, which is at present the most used anode material for proton-conducting …
Position Preference And Diffusion Path Of An Oxygen Ion In Apatite-Type Lanthanum Silicate La9.33si6o26: A Density Functional Study, Ting Liao, Taizo Sasaki, Shigeru Suehara, Ziqi Sun
Position Preference And Diffusion Path Of An Oxygen Ion In Apatite-Type Lanthanum Silicate La9.33si6o26: A Density Functional Study, Ting Liao, Taizo Sasaki, Shigeru Suehara, Ziqi Sun
Australian Institute for Innovative Materials - Papers
Using density functional theory, we investigated the position preference and diffusion mechanisms of interstitial oxygen ions in lanthanum silicate La9.33Si6O26, which is an apatite-structured oxide and a promising candidate electrolyte material for solid oxide fuel cells. The reported lanthanum vacancies were explicitly taken into account by theoretically determining their arrangement with a supercell model. The most stable structures and the formation energies of oxygen interstitials were determined for each charged state. It was found that the double-negatively charged state is stable over a wide range of the Fermi level, and that the excess oxygen …
Domain Wall Conductivity In Oxygen Deficient Multiferroic Ymno3 Single Crystals, Yi Du, Xiaolin Wang, Dapeng Chen, S X. Dou, Z. Cheng, Michael J. Higgins, Gordon G. Wallace, Jiazhao Wang
Domain Wall Conductivity In Oxygen Deficient Multiferroic Ymno3 Single Crystals, Yi Du, Xiaolin Wang, Dapeng Chen, S X. Dou, Z. Cheng, Michael J. Higgins, Gordon G. Wallace, Jiazhao Wang
Australian Institute for Innovative Materials - Papers
The transport properties of domain walls in oxygen deficient multiferroic YMnO3 single crystals have been probed using conductive atomic force microscopy and piezoresponse force microscopy. Domain walls exhibit significantly enhanced conductance after being poled in electric fields, possibly induced by oxygen vacancy ordering at domain walls. The electronic conduction can be understood by the Schottky emission and Fowler-Nordheim tunnelling mechanisms. Our results show that the domain wall conductance can be modulated through band structure engineering by manipulating ordered oxygen vacancies in the poling fields.
Fabrication, Magnetic, And Ferroelectric Properties Of Multiferroic Bifeo3 Hollow Nanoparticles, Yi Du, Z. Cheng, S X. Dou, Darren J. Attard, Xiaolin Wang
Fabrication, Magnetic, And Ferroelectric Properties Of Multiferroic Bifeo3 Hollow Nanoparticles, Yi Du, Z. Cheng, S X. Dou, Darren J. Attard, Xiaolin Wang
Australian Institute for Innovative Materials - Papers
Hollow BiFeO3nanoparticles were synthesized by an electrospray route for the first time. The phase purity and structure have been investigated by x-ray diffraction and Raman spectroscopy. Transmission and scanning electron microscope investigations revealed that the as-obtained BiFeO3 hollow spheres were polycrystalline, with a shell thickness of 35 nm. The formation mechanism can be possibly explained by Ostwald ripening. Raman spectra have verified decreased vibrational frequencies in BiFeO3nanoparticles. These hollow and core-shell multiferroicnanoparticles exhibit significantly enhanced ferromagnetism from 5 to 600 K due to a broken spiral spin structure. The ferroelectricity of hollow BiFeO3 particles …
Dye-Sensitized Cualo2 Photocathodes For Tandem Solar Cell Applications, Andrew Nattestad, Xiaoli Zhang, Udo Bach, Yi-Bing Cheng
Dye-Sensitized Cualo2 Photocathodes For Tandem Solar Cell Applications, Andrew Nattestad, Xiaoli Zhang, Udo Bach, Yi-Bing Cheng
Australian Institute for Innovative Materials - Papers
Dye-sensitized solar cells (DSCs) using the p-type semiconductor CuAlO2, in conjunction with a highly effective hole injecting dye and an iodide-triiodide-based electrolyte have been produced, demonstrating photocathodic behavior. An improved open-circuit voltage (VOC) of 333 mV was observed, compared to analogous devices using NiO, which can be explained by the CuAlO2 valence-band energy, which is lower on the vacuum scale than that of NiO. Incident photon-to-charge-carrier efficiency response confirms that the observed photocurrent is generated by the dye.
Chitosan Adhesive Films For Photochemical Tissue Bonding, Antonio Lauto, Damia Mawad, Matthew Barton, Sabine C. Piller, Leonardo Longo
Chitosan Adhesive Films For Photochemical Tissue Bonding, Antonio Lauto, Damia Mawad, Matthew Barton, Sabine C. Piller, Leonardo Longo
Australian Institute for Innovative Materials - Papers
Photochemical tissue bonding (PTB) is a promising sutureless technique for tissue repair. PTB is often achieved by applying a solution of rose bengal (RB) between two tissue edges, which are irradiated by a green laser to crosslink collagen fibers with minimal heat production. In this study, RB has been incorporated in chitosan films to create a novel tissue adhesive that is laser-activated. Materials and Methods. Adhesive films, based on chitosan and containing ∼0.1wt% RB were manufactured and bonded to calf intestine by a solid state laser (wavelength =532nm, Fluence ∼110J/cm2, spot size ∼5 mm). A single-column tensiometer, interfaced with a …
A Highly Ordered Titania Nanotube Array As A Supercapacitor Electrode, Maryam Salari, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Hua-Kun Liu
A Highly Ordered Titania Nanotube Array As A Supercapacitor Electrode, Maryam Salari, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
We report the synthesis of self-organized titania nanotubes and nanocrystalline titania powders employing an alternative and novel approach. Integrating these nanostructures in a binder-free working electrode improved the capacitance up to 911 uF cm-2, which is around one to two orders of magnitude higher than the conventional electric double layer capacitors.
Control Of Biodegradation Of A Mg Alloy In Simulated Body Fluid, Yafei Zhang, Maria Forsyth, Bruce Hinton, Gordon G. Wallace
Control Of Biodegradation Of A Mg Alloy In Simulated Body Fluid, Yafei Zhang, Maria Forsyth, Bruce Hinton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Mg alloy AZ31 is an attractive candidate for coronary artery stents, as it possesses excellent biocompatibility in human body and good mechanical properties. However, AZ31 magnesium alloys generally have poor corrosion resistance in the body environment. This paper reports on the early stages of an investigation into the corrosion mechanism and the morphology of corrosion of AZ31 in simulated body fluid (SBF), The investigation will also consider ways of improving corrosion resistance of this alloy in SBF through the use of ionic liquids. The results to date have shown that AZ31 suffers severe localized pitting corrosion in SBF. The pits …
Phase Diagram Of Vortex Matter Of Type-Ii Superconductors, Xuebin Xu, H Fangohr, Shichao Ding, F Zhou, X. N. Xu, Z H. Wang, M Gu, Dongqi Shi, S X. Dou
Phase Diagram Of Vortex Matter Of Type-Ii Superconductors, Xuebin Xu, H Fangohr, Shichao Ding, F Zhou, X. N. Xu, Z H. Wang, M Gu, Dongqi Shi, S X. Dou
Australian Institute for Innovative Materials - Papers
We propose a model to construct the phase diagram for type-II superconductors through molecular-dynamics simulation. In this model, the Abrikosov vortices interact with long-range repulsion and short-range attraction. We are able to obtain the phase diagrams consisting of the vortex lattice, the intermediate-mixed phase (IMP), and the disordered vortex phase in the B-T , B-κ, and B-q planes, where B is induction, κ is the Ginzburg-Landau parameter, and q is the relative strength of the attraction to repulsion interactions between vortices. The IMP is in the form of a superlattice of either vortex bubbles or parallel vortex stripes, agreeing excellently …
5-Chloro-1-Phenyl-1h-Pyrazol-4-Amine, A Korzanski, Pawel W. Wagner, Maciej Kubicki
5-Chloro-1-Phenyl-1h-Pyrazol-4-Amine, A Korzanski, Pawel W. Wagner, Maciej Kubicki
Australian Institute for Innovative Materials - Papers
No abstract provided.
Ammonium Octahydrotriborate (Nh4b3h8): New Synthesis, Structure, And Hydrolytic Hydrogen Release, Zhenguo Huang, Xuenian Chen, Teshome Yisgedu, Edward A. Meyers, Sheldon Shore, J C. Zhao
Ammonium Octahydrotriborate (Nh4b3h8): New Synthesis, Structure, And Hydrolytic Hydrogen Release, Zhenguo Huang, Xuenian Chen, Teshome Yisgedu, Edward A. Meyers, Sheldon Shore, J C. Zhao
Australian Institute for Innovative Materials - Papers
A metathesis reaction between unsolvated NaB3H8 and NH4Cl provides a simple and high-yield synthesis of NH4B3H8. Structure determination through X-ray single crystal diffraction analysis reveals weak N—Hδ+- - -Hδ-—B interaction in NH4B3H8 and strong N—Hδ+—Hδ-—B interaction in NH4B3H8·18-crown-6·THF adduct. Pyrolysis of NH4B3H8 leads to the formation of hydrogen gas with appreciable amounts of other volatile boranes below 160°C. Hydrolysis experiments show that …
High-Capacity Hydrogen Release Through Hydrolysis Of Nab3h8, Zhenguo Huang, Xuenian Chen, Teshome Yisgedu, J C. Zhao, Sheldon Shore
High-Capacity Hydrogen Release Through Hydrolysis Of Nab3h8, Zhenguo Huang, Xuenian Chen, Teshome Yisgedu, J C. Zhao, Sheldon Shore
Australian Institute for Innovative Materials - Papers
NaB3H8 has advantages over NaBH4 and NH3BH3, two most widely studied chemical hydrides for hydrogen storage via hydrolysis. NaB3H8 has an extraordinary high solubility in water and thus possesses a high theoretical capacity of 10.5 wt% H via hydrolysis, in contrast to 7.5 wt% for NaBH4 and 5.1 wt% for NH3BH3. NaB3H8 is reasonably stable in water which makes it unnecessary to add corrosive NaOH as a stabilizer as the case for NaBH4. Furthermore, hydrolysis of NaB3H8 can be catalyzed by a Co-based catalyst with fast kinetics that is comparable to Ru-based catalysts. Therefore, cost-effective hydrolysis of NaB3H8 is possible …
Show Us Your (Carbon Nanotube Artificial) Muscles!, Geoffrey M. Spinks
Show Us Your (Carbon Nanotube Artificial) Muscles!, Geoffrey M. Spinks
Australian Institute for Innovative Materials - Papers
The idea of doctors deploying miniscule robots in your body to diagnose and treat medical conditions is closer to reality today with the development of artificial muscles small and strong enough to push such tiny "nano-bots" along.
Dithienothiophene (Dtt)-Based Dyes For Dye-Sensitized Solar Cells: Synthesis Of 2,6-Dibromo-Dtt, Tae-Hyuk Kwon, Vanessa Armel, Andrew Nattestad, Douglas R. Macfarlane, Udo Bach, Samuel J. Lind, Keith C. Gordon, Weihua Tang, David J. Jones, Andrew Holmes
Dithienothiophene (Dtt)-Based Dyes For Dye-Sensitized Solar Cells: Synthesis Of 2,6-Dibromo-Dtt, Tae-Hyuk Kwon, Vanessa Armel, Andrew Nattestad, Douglas R. Macfarlane, Udo Bach, Samuel J. Lind, Keith C. Gordon, Weihua Tang, David J. Jones, Andrew Holmes
Australian Institute for Innovative Materials - Papers
A one-pot synthesis of 2,6-dibromodithieno[3,2-b;2′,3′-d]thiophene (dibromo-DTT, 4) was developed. A key step was bromodecarboxylation of DTT-2,6-dicarboxylic acid, obtained by saponification of the diester 1. The donor-acceptor dye DAHTDTT (13), based on a central 2,6-bis[2′-(3′-hexylthienyl)]dithieno[3,2-b;2′,3′-d]thiophene core (9), was prepared and incorporated in a dye-sensitized solar cell (DSC), which exhibited an energy conversion efficiency of 7.3% with Voc of 697 mV, Jsc of 14.4 mA/cm2, and ff of 0.73 at 1 sun.
Oxidative Acetylenic Coupling Reactions As A Surface Chemistry Tool, Simone Ciampi, Michael James, Nadim A. Darwish, Erwann Luais, Bin Guan, Jason Brian Harper, J Justin Gooding
Oxidative Acetylenic Coupling Reactions As A Surface Chemistry Tool, Simone Ciampi, Michael James, Nadim A. Darwish, Erwann Luais, Bin Guan, Jason Brian Harper, J Justin Gooding
Australian Institute for Innovative Materials - Papers
A novel method to prepare redox monolayers on silicon electrodes has been developed that employs CuI-catalyzed oxidative acetylenic coupling reactions for molecular electronic type applications. As the first case study, ethynylferrocene was covalently immobilized onto an acetylene-terminated monolayer on a Si(100) surface to give a 1,3-diyne (CC-CC-) linked redox assembly. The derivatization process requires no protection/de-protection steps, nor activation procedures. The effect of the conjugated diyne linkage on the rate of electron transfer between tethered ferrocenyl units and the silicon electrode is benchmarked against well-established "click" products (i.e. 1,2,3-triazole linkage). The surfaces, after each step, are characterized thoroughly using X-ray …
The Molecular Level Modification Of Surfaces: From Self-Assembled Monolayers To Complex Molecular Assemblies, J Justin Gooding, Simone Ciampi
The Molecular Level Modification Of Surfaces: From Self-Assembled Monolayers To Complex Molecular Assemblies, J Justin Gooding, Simone Ciampi
Australian Institute for Innovative Materials - Papers
The modification of surfaces with self-assembled monolayers (SAMs) containing multiple different molecules, or containing molecules with multiple different functional components, or both, has become increasingly popular over the last two decades. This explosion of interest is primarily related to the ability to control the modification of interfaces with something approaching molecular level control and to the ability to characterise the molecular constructs by which the surface is modified. Over this time the level of sophistication of molecular constructs, and the level of knowledge related to how to fabricate molecular constructs on surfaces have advanced enormously. This critical review aims to …
Molecular-Beam Epitaxy And Robust Superconductivity Of Stoichiometric Fese Crystalline Films On Bilayer Graphene, Canli Song, Yi-Lin Wang, Yeping Jiang, Zhi Li, Lili Wang, Ke He, Xi Chen, Xu-Cun Ma, Qi-Kun Xue
Molecular-Beam Epitaxy And Robust Superconductivity Of Stoichiometric Fese Crystalline Films On Bilayer Graphene, Canli Song, Yi-Lin Wang, Yeping Jiang, Zhi Li, Lili Wang, Ke He, Xi Chen, Xu-Cun Ma, Qi-Kun Xue
Australian Institute for Innovative Materials - Papers
We report on molecular beam epitaxy growth of stoichiometric and superconducting FeSe crystalline thin films on double-layer graphene. Layer-by-layer growth of high-quality films has been achieved in a well-controlled manner by using Se-rich condition, which allow us to investigate the thickness-dependent superconductivity of FeSe. In situ low-temperature scanning tunneling spectra reveal that the local superconducting gap in the quasiparticle density of states is visible down to two triple layers for the minimum measurement temperature of 2.2 K, and that the transition temperature Tc scales inversely with film thickness.
Block-Copolymer-Assisted Synthesis Of Hydroxyapatite Nanoparticles With High Surface Area And Uniform Size, Yu Huang, Masataka Imura, Yoshihiro Nemoto, Chao Hung Cheng, Yusuke Yamauchi
Block-Copolymer-Assisted Synthesis Of Hydroxyapatite Nanoparticles With High Surface Area And Uniform Size, Yu Huang, Masataka Imura, Yoshihiro Nemoto, Chao Hung Cheng, Yusuke Yamauchi
Australian Institute for Innovative Materials - Papers
We report the synthesis of hydroxyapatite nanoparticles (HANPs) by the coprecipitation method using calcium D-gluconate and potassium hydrogen phosphate as the sources of calcium and phosphate ions, respectively, and the triblock copolymer F127 as a stabilizer. The HANPs were characterized using scanning electron microscopy, x-ray diffraction, and nitrogen adsorption/desorption isotherms. Removal of F127 by solvent extraction or calcination alters the structure of HANPs. The solvent-extracted HANPs were single crystals with their 〈001〉 axis oriented along the rod axis of the HANP, whereas the calcined HANPs contained two crystal phases that resulted in a spherical morphology. The calcined HANPs had much …
Electromechanical Properties Of Pb (In1/2nb1/2) O3-Pb (Mg1/3nb2/3) O3-Pbtio3 Single Crystals, Fei Li, Shujun Zhang, Dabin Lin, Jun Luo, Zhuo Xu, Xiaoyong Wei, Thomas R. Shrout
Electromechanical Properties Of Pb (In1/2nb1/2) O3-Pb (Mg1/3nb2/3) O3-Pbtio3 Single Crystals, Fei Li, Shujun Zhang, Dabin Lin, Jun Luo, Zhuo Xu, Xiaoyong Wei, Thomas R. Shrout
Australian Institute for Innovative Materials - Papers
The Pb (In1/2Nb1/2) O3–Pb (Mg1/3Nb2/3) O3–PbTiO3 (PIN-PMN-PT) crystals were studied as function of phase and orientation. The properties, including the Curie temperature TC, ferroelectric-ferroelectric phase transition temperature TR/O-T, coercive field, and piezoelectric/dielectric responses, were systematically investigated with respect to the composition of PIN-PMN-PT crystals. The Curie temperature TC was found to increase from 160 to 220 °C with ferroelectric-ferroelectric phase transition temperature TR-T and TO-T being in the range of 120–105 °C and 105–50 °C, respectively. The piezoelectric activity of …