Chung-Kwei Lin

Taipei Medical University | TMU · School of Dental Technology

Preparing electrospun fibers by applying a potential difference between a polymeric solution and a contacting substrate is increasingly attracting attention in tissue engineering applications. Among the numerous polymers, polycaprolactone (PCL) bioscaffold has been widely investigated due to its biocompatibility and biodegradability. Bioactive powd...

Carburized steel shafts are commonly used in industry due to their good wear resistance and fatigue life. If the surface of carburized shafts exhibits an undesired tensile stress, shot peening treatment may be required to alter the stress condition on the surface. In the present study, the effects of shot peening pressure (3–5 kg/cm2), time (32–64...

Barium zirconate (BaZrO3, BZO), which exhibits superior mechanical, thermal, and chemical stability, has been widely used in many applications. In dentistry, BZO is used as a radiopacifier in mineral trioxide aggregates (MTAs) for endodontic filling applications. In the present study, BZO was prepared using the sol–gel process, followed by calcinat...

Barium titanate (BaTiO3, BTO), conventionally used for dielectric and ferroelectric applications, has been assessed for biomedical applications, such as its utilization as a radiopacifier in mineral trioxide aggregates (MTA) for endodontic treatment. In the present study, BTO powders were prepared using the sol-gel process, followed by calcination...

Global energy sources are limited, and energy requirements are ever-increasing due to the demand for developments in human life and technology. The environmentally friendly direct formic acid fuel cell (DFAFC) is an attractive electronic device due to its clean energy. In a DFAFC, an anodic catalyst plays an important role concerning the oxidation...

The one-pot process, which combines the polymerization of polyaniline (i.e., PANI) with subsequent reduction of iron nanowire (i.e., Fe NW) under a magnetic field, was developed to produce Fe@PANI core–shell nanowires. The synthesized nanowires with various PANI additions (0–30 wt.%) were characterized and used as microwave absorbers. Epoxy composi...

Mesoporous bioactive glass (MBG) possesses a high specific surface area and excellent biocompatibility making it a promising biomaterial. In the present study, poly(methyl methacrylate) (PMMA) was coated on MBG to obtain a [email protected] core-shell structure to further expand the potential applications of MBG. Changes in the MMA to MBG ratio, po...

Mineral trioxide aggregates (MTA) have been widely used in endodontic treatments, but after some time, patients suffer tooth discoloration due to the use of bismuth oxide (Bi2O3) as a radiopacifier. Replacement of Bi2O3 with high energy ball-milled single (zirconia ZrO2; hafnia, HfO2; or tantalum pentoxide, Ta2O5) or binary oxide powder was attempt...

Among the various phases of bismuth oxide, the high temperature metastable face-centered cubic δ phase attracts great attention due to its unique properties. It can be used as an ionic conductor or an endodontic radiopacifying material. However, no reports concerning tantalum and bismuth binary oxide prepared by high energy ball milling and serving...

Supercapacitive properties of Co/ZnCo oxide composite with a core-shell nanostructure (Co3O4/ZnCo2O4) prepared directly onto a nickel foam substrate by a two-step hydrothermal method were investigated. The synthesized core-shell structure consisted of some ~40-100 nm in thick flaky ZnCo2O4 deposits coated onto the surface of Co3O4 nanorods measurin...

Mineral trioxide aggregate (MTA) is well known as an effective root canal filling material for endodontics therapy. Within MTA, bismuth oxide (Bi2O3) serving as the radiopacifier still has biocompatibility concerns due to its mild cytotoxicity. In the present study, we tried to modify the Bi2O3 radiopacifier by doping hafnium ions via the sol-gel p...

Mesoporous bioactive glass (MBG) has a high specific surface area, promoting the reaction area, thereby improving the bioactivity; thus, MBG is currently gaining popularity in the biomaterial field. Spray pyrolysis (SP) is a one-pot process that has the advantages of shorter process time and better particle bioactivity, therefore, MBG was prepared...

Poly(aryl–ether–ketone) materials (PAEKs) are gaining interest in everyday dental practices because of their natural properties. This study aims to analyze the bonding performance of PAEKs to a denture acrylic. Testing materials were pretreated by grinding, sandblasting, and priming prior to polymerization with the denture acrylic. The surface morp...

Mineral trioxide aggregates (MTA) have been developed as a dental root repair material for a range of endodontics procedures. They contain a small amount of bismuth oxide (Bi2O3) as a radiopacifier to differentiate adjacent bone tissue on radiographs for endodontic surgery. However, the addition of Bi2O3 to MTA will increase porosity and lead to th...

Zirconia materials are widely used in digital dentistry due to their excellent properties. Although zirconia prostheses are typically prepared using computer-aided design and manufacturing, additive manufacturing technology can also be used. Both digital methods, however, may result in a large amount of residue zirconia. In the present study, solve...

Tremendous efforts have been made on the development of unique electrochemical capacitors or pseudocapacitors due to the overgrowing electrical energy demand. Here, the authors report a new and simple strategy for fabricating hybrid MnOx-coated ZnO nanorod arrays. First, the vertically aligned ZnO nanorods were prepared by chemical bath deposition...

MoO3/V2O5 hybrid nanobilayers are successfully prepared by the sol–gel method with a spin- coating technique followed by heat -treatment at 350 °C in order to achieve a good crystallinity. The composition, morphology, and microstructure of the nanobilayers are characterized by a scanning electron microscope (SEM) and X-ray diffractometer (XRD) that...

Microstructure of Iron (Fe) Nanowires Synthesized by Chemical Reduction of Different Fe Ionic Precursors - Volume 25 Supplement - Sz-Chian Liou, Wen-An Chiou, Yubing Zhou, Xu-Xiang Cai, Mao-Yuan Chen, Yuh-Jing Chiou, Hong-Ming Lin, Chung-Kwei Lin

High-temperature face-centered cubic bismuth oxide phase is a material of great interest given its unique properties. In the present study, α-Bi2O3 and tantalum powders were used as the starting powders for the formation of high-temperature bismuth oxide phase via mechanochemical synthesis by high energy ball milling. (Bi2O3)80(Ta)20 and (Bi2O3)95(...

In the present study, spherical composite powder was successfully prepared via spray drying process using polymethyl methacrylate (PMMA) and hexagonal boron nitride (h-BN) powders. The pristine and as-prepared composite powders were examined using scanning electron microscopy, a particle size analyzer, oil absorption, and specific surface area anal...

A low operating temperature CO (carbon monoxide) sensor was fabricated from a nanometer-scale SnO2 (tin oxide) powder. The SnO2 nanoparticles in a size range 10–20 nm were synthesized as a function of surfactant (tri-n-octylamine, TOA) addition (0–1.5 mol%) via a simple thermal decomposition method. The resulting SnO2 nanoparticles were first scree...

Calcium phosphate ceramics used in dentistry and orthopedics are some of the most valuable biomaterials, owing to their excellent osteoconduction, osteoinduction, and osseointegration. Osteoconduction and osteoinduction are critical targets for bone regeneration, and osseointegration is essential for any dental implantations. In this study, a hydro...

Bismuth oxide (Bi2O3) is an effective additive used to enhance radiography resolution for dental materials. However, there are potential concerns regarding its biocompatibility and connection to tissue discoloration. In the present study, we modified the radiopacity properties of Bi2O3 with zirconium oxide (ZrO2) using a sol-gel process and investi...

In this study, a photoresist template with well-defined contact hole array was fabricated, to which radio frequency magnetron sputtering process was then applied to deposit an alloyed Zr55Cu30Al10Ni5 target, and finally resulted in ordered metallic glass nanotube (MGNT) arrays after removal of the photoresist template. The thickness of the MGNT wal...

In this study, Bi2O3 powders were modified into ZrO2-doped Bi2O3 powders by adding zirconium oxide through precipitation processes. The radiopacity and physical properties of as-synthesized and heat-treated products were investigated. The products were primarily composed of a mixture of β-Bi7.38Zr0.62O12.31 and α-Bi2O3 obtained below 700 °C, then t...

In the present study, a manganese (Mn) oxide deposited hierarchical cobalt (Co) oxide structure was prepared as a supercapacitor electrode by a two-step hydrothermal process. A Co-oxide hierarchical structure was first prepared as a template on a graphite substrate by hydrothermal and post heat treatment (calcination) processes. Subsequently, the M...

Among new energy systems, fuel cells are electrochemical devices transforming chemical energy directly into electrical energy. In our previous works, MWCNTs (the multi walled carbon nanotubes) supported palladium anodic electrocatalysts for DFAFCs (direct formic acid fuel cells) have been studied. MWCNTs can be modified by appropriate oxides, for e...

Silver nanocrystals combined with bioactive glass are promising nanocomposites in the field of biomedical engineering, due to their bioactivity and antimicrobial properties. The aim of this work is to devise a fast protocol that combines synchrotron X-ray reduced silver nanoparticles with spray pyrolyzed mesoporous bioactive glass. By using this me...

Due to its excellent bioactivity, bioactive glass (BG) is suitable for use as bone graft substitutes in biomedical applications. In this study, carbon nanotubes (CNT-COOH) served as templates for depositing bioactive glass based on 60SiO2–36CaO–4P2O5 wt% were synthesized via the sol–gel process. The BG and BG/CNT-COOH composites were treated at 300...

For the direct formic acid fuel cells, anodic Pd catalyst has attracted considerable attention recently. In order to enhance the catalytic ability, conductivity, and prevent from the catalyst poisoning, the synthesis of Au-Pd solid solution phase decorated on Ir or Ru doped CeO2 modified MWCNTs substrate by polyol and synchrotron X-ray irradiation...

In this study, the dicalcium phosphate dehydrate (DCPD)/carboxymethyl hexanoyl chitosan (CHC) hybrid coating layer with sequential release of BMP-2 and TGF-β1 was deposited onto Ti6Al4V substrate by electrochemical co-precipitation method. Different concentrations of amphiphatic chitosan derivative (carboxymethyl hexanoyl chitosan, CHC), BMP-2 and...

In this study, the supercapacitive performances of manganese oxide films were investigated by adding different carbon nanomaterials, including carbon nanocapsules (CNC), multiwalled carbon nanotubes (MWCNTs) and multi-layered graphene. The manganese oxide films were prepared with manganese acetate precursor by sol–gel method, and the post-treatment...

In this study, γ-Al2O3 particles were dispersed in p-type Bi0.4Sb1.6Te3 through mechanical alloying to form γ-Al2O3/Bi0.4Sb1.6Te3 composite powders. The composite powders were consolidated using vacuum hot pressing to produce nano- and microstructured composites. Thermoelectric (TE) measurements indicated that adding an optimal amount of γ-Al2O3 na...

We demonstrate that the combination of x-ray irradiation and capping by polyethylene glycol (PEG) produces excellent flexibility in controlling the structure of Au-Pd nanoparticles while preserving their catalytic performance. We specifically adopted two different fabrication methods: co-reduction and seed-assisted reduction. In both cases, precurs...

The catalytic properties of Pd trigger a strong interest on the related catalysis by Au-Pd nanoparticles. However, the analysis of such phenomena was complicated so far by the presence of capping. Using x-ray irradiation, we could produce uncapped Au-Pd nanoparticles and study their catalytic features, finding in particular their relation to the Pd...

Nano-crystalline Fe3O4 powders were added to form manganese oxide/iron oxide composite film electrode in order to combine the excellent capacitance characteristics of manganese oxide and iron oxide. Due to the addition of Fe3O4, the crack film formation increases the contact area of electrolyte and electrode and the surface and electronic conductiv...

This study utilized electroless nickel (EN) and cathodic arc evaporation (CAE) technologies to deposit protective coatings onto ductile iron. Polarization corrosion tests were performed in 3.5 wt.% sodium chloride, and also erosion tests were carried out by using Al2O3 particles (∼177 μm in size and Mohr 7 scale) of about 5 g. Surface morphologies...

In the present study, the spray drying process was used to prepare spherical composite powders from TiO2/mica and h-BN powders. The starting and the as-prepared powders were examined by X-ray diffraction, scanning electron microscopy, particle size analyzer, spectrophotometer, and oil absorption analysis. Particle size distribution, crystalline pha...

In the present study, TiO2/mica and hexagonal boron nitride powders were used as the starting materials to prepare composite powders by mechanical mixing and spray drying. The starting powders, as-prepared powders, and nano-TiO2 were examined by scanning electron microscopy, particle-size analysis, and X-ray diffraction to reveal the powder morphol...

This work presents large-scale dye-sensitized solar cells and methods for their manufacture. A dye-sensitized solar cell device contains a photosensitive dye adsorbed on a large surface of the anode, and a transparent conductive cathode disposed opposite the anode, wherein platinum nano-catalytic particles adhere to its surface, and an electrolytic...

This study evaluates the radiopacity and cytotoxicity of Portland cements containing a radiopacifier of bismuth oxide (Bi2O3) with yttria-stabilized zirconia (YSZ) dopant. Various radiopacifier powders of Bi2O3 with 0%, 15%, 30%, and 100% YSZ dopant were prepared by solid-state reaction at 700°C for 12 hours and characterized by x-ray diffraction....

Bioactive glasses (BGs) have been applied for bone transplant surgery, dentistry, and drug delivery due to their high reactive surface areas and excellent bioactive properties. Spray pyrolysis (SP) has been employed to fabricate BG in order to overcome the disadvantages of common techniques such as the conventional glass method (low purity and high...

The effect of microstructure on the optical and electrochemical properties of nanostructured tungsten oxide films was evaluated as a function of annealing temperature. The films using block copolymer as the template were prepared from peroxotungstic acid (PTA) by spin-coating onto the substrate and post-annealed at 250–400 °C to form tungsten oxide...

Tungsten films on ITO glass were anodized into a porous amorphous WO3 film morphology at 60 V. The follow-up acidic treatment of the anodized WO3 films in H2SO4 solution transformed the morphology into plate-like WO3 center dot 2H(2)O. Glancing incident X-ray diffraction and Raman scattering spectra indicated that the growth of plate-like WO3 cente...

SUS 430 ferritic stainless steel shows poor performance in corrosion resistance when compared with austenitic stainless steels, thus the material has limited actual application. In this study, SUS 430 stainless steel was selected as the experimental substrate, and a PVD method, cathodic arc deposition, was used to deposit single-layered TiN, CrN an...

Pristine and surfactant F-127 added tungsten oxide films have been prepared successfully by sol–gel method using PTA as the precursor sol. After annealing at 300 °C, amorphous WO3 films with or without F-127 additions were prepared. The F-127-added tungsten oxide films exhibit porous microstructure, which are affected by the amount of F-127 additio...

Manganese oxide electrodes possessing pseudo-capacitance behaviors were successfully made with a simple sol-gel method. The experimental results showed that the specific capacitance was 101.2 F/g for pure manganese oxide films after annealing at 300 °C. However, the specific capacitance increased to 232.3 F/g with iron acetate (1.0 mol% Fe) additio...

Anodic aluminum oxide (AAO) templates with diameters of 200–500 nm were generated by anodizing a commercial aluminum (Al) substrate (99.7%) in 1 vol% phosphoric acid (H3PO4), with an applied voltage of 195 V. Titania and tungsten oxide nanotubes (NTs) were successfully grown on AAO template by the sol–gel process. Thermal gravimetric analyzer (TGA)...

High values of magnetic permeability and dielectric permittivity of polymer composite containing flake-shaped iron particles were prepared by the mechanical milling of two batches of iron powders [Fe(A) and Fe(B)] under controlled conditions. The frequency-dependent complex permittivity (ε'-jε") and permeability (μ'-jμ") of resin composites with 40...

This study experimentally investigates the ability of Bi2O3/P3HT heterojunction thin films to improve the power-conversion efficiency of InGaN-based photovoltaic (PV) devices. InGaN-based PV devices combined with Bi2O3/P3HT heterojunctions were prepared using the pulsed laser deposition method. The Bi2O3/P3HT heterojunction creates carriers that co...

Tungsten oxide (WO3) films prepared by annealing electrochemically anodized metallic tungsten (W) films deposited by radio-frequency sputtering were characterized. Tungsten oxide films of various morphology, crystallinity, and porosity can be prepared by carefully altering the anodization time (20–50 min) and annealing temperature (450–550 °C). The...

Zinc oxide (ZnO) has recently been reported to exhibit electrochemical supercapacitive properties. We demonstrate, for the first time, a nanocrystalline (<10 nm) composite powder electrochemical supercapacitor in which ZnO-added manganese oxide is used as the active electrode material. The ZnO-added (≤10 at%) manganese oxide powders were prepared f...

Hierarchical thin-film photocatalysts exhibiting surface roughness at two length scales were prepared by the consecutive formation of ZnO microstripes and ZnO nanorod-array. ZnO stripes with microscale roughness were fabricated after removing the ink-jet printed ribs. Then, nanoscale roughness was achieved by the growth of ZnO nanorods on the surfa...

In the present study, ZnO-doped manganese (Mn) oxide coatings were prepared as a function of ZnO content (≤ 40 at.%) by sol–gel process. After post heat treatment at 300 °C, the influences of ZnO on the microstructural characteristics and pseudocapacitive performance of the Mn-oxide films were investigated. The structural analyses identified the so...

Manganese oxide electrodes with promising behavior were prepared successfully by sol–gel process. Manganese oxide films were also modified with the addition of submicron-crystalline iron powders. Effects of post heat treatment and iron submicron-powder addition on the material characteristics and electrochemical capacitance of the manganese oxide e...

This paper discussed fabrication of TiO2 and BaTiO3 nanotubes by sol-gel method and used anodic aluminum oxide (AAO) as template. The mechanical properties of TiO2 or BaTiO3NTs are not great, so a longer tube can crack easily, leading to the peeling off of the NTs film from the Ti substrate. Therefore, we propose to use AAO as a template, followed...

Vanadium-based oxides are prepared on graphite substrates by an anodic deposition technique. The plating bath is 0.2 M VOSO4 solution with NaCH3COO addition. A scanning electron microscope and an X-ray diffractometer are used to characterize the deposits; the analyses indicate that the porous Na-doped V2O5 electrodes with a nano-crystalline nature...

Despite the fact that polystyrene (PS) spheres have been developed as polymeric carriers or matrices for various biomedical applications, the synthesis of PS spheres is time-consuming. This work describes the fabrication of a uniform PS sphere, coated with silver nanoparticles (Ag-PS), by simultaneous photoinduced polymerization and reduction fabri...

Electrochromic WO3 films are prepared by the electron-beam evaporation method. The as-deposited films are amorphous in structure. The optical transmittance spectra show 13.4% decay of optical modulation after 20 electrochemical cycles. The degradation behaviour of the WO3 films is also observed in electrochemical step potential measurements. X-ray...

Surface modified iron nanowire nanoparticles were prepared via reduction of iron salts (FeCl3· 6H2O) under an applied magnetic field. To minimize the surface oxidation, dextran (0.05 and 0.25 wt. %) was added during the process and formed a thin passive layer over iron nanowires with alcohol and acetone used to wash iron nanowires. The complex perm...

In the present study, titania-doped (Ti-doped) W18O49 nanorods have been prepared using a modified plasma arc gas condensation technique. Characterizations by field-emission gun scanning electron microscopy, X-ray powder diffraction, high-resolution transmission electron microscopy and high-resolution X-ray photoelectron spectroscopy indicate that...

In the present study, iron/iron oxide (with a ratio of 4/1, 1/1, and 1/4) composite particles were prepared by precipitation. The morphology and phase composition were examined by scanning electron microscopy and X-ray diffraction techniques. The as-prepared composite particles were mixed with epoxy resin to prepare microwave absorbers and the corr...

The correlations between the structures and gas-sensing properties of porous thin-film gas sensors made of packed hollow spheres are investigated. For this purpose, hollow polymeric spheres were used as templates. Double-shell hollow spheres were prepared by encapsulating the polymeric hollow spheres with TiO2 shells. Solid polymeric spheres were u...

In this study, tungsten oxide films were prepared by sol–gel technique. Various amounts of multiwalled carbon nanotubes (MWCNTs) were added during sol–gel process to obtain hybrid WO3/MWCNT films. The original and hybrid films were characterized by thermogravimetric analysis, X-ray diffraction analysis, and scanning electron microscopy analysis, wh...

In the present study, high-yield W18O49@TiO2 core–shell nanoparticles were prepared by modified plasma arc gas condensation without any catalysts or substrates. All the as-prepared samples were characterized by FEG-SEM, XRD, FEG-STEM, and HAADF analytic techniques. The results of the structural analysis show that the as-prepared nanoparticles prese...

Various tungsten oxide-based nanomaterials have been prepared by a modified plasma arc gas condensation technique without the use of catalysts or substrates. These products could be obtained by controlling the processing parameters during experiment. All the as-obtained samples were characterized by field emission gun scanning electron microscopy,...

CrTiAlN films were deposited on AISI 304 stainless steel by cathodic arc evaporation under a systematic variation of the substrate bias voltage. The effects of substrate bias on the coating morphology and mechanical properties, such as structure, composition, adhesion, hardness and Young's modulus, were studied in details using field emission scann...

Nowadays human are exposed to an environment filling with electromagnetic waves over a wide frequency range. The electromagnetic properties of microwave absorbing materials plays an important role in the performance of civilian electromagnetic interference (EMI) shielding at low frequency range and military stealth technology at high frequency one....

A356 is a heat treatable Al?Si?Mg hypoeutectic alloy with a normal composition of 7?wt?%Si and ?0·3?wt?%Mg which has widespread applications in the aerospace and automotive industries. The influence of the rare earth metals La and Ce on the microstructures and mechanical properties of A356 alloy has been investigated. The findings indicate that the...

Iron nanowires and nanoparticles are fabricated via the reduction of iron salts (FeCl3•6H2O) with or without a parallel magnetic field, respectively. Polyvinyl pyrrolidone was added during the reduction process and formed a thin passive layer to minimize the oxidation. The as-obtained iron nanomaterials were then used as magnetic fillers, added to...

The dielectric and magnetic properties of manganese oxide-coated Fe3O4 nanoparticles (NPs) were measured by the transmission/reflection method in 2-18 GHz. MnOx-coated Fe3O4 NPs were prepared by sol-gel method followed by heat-treating at 300, 400, and 500 °C, respectively. The heat-treated powders were then used as magnetic fillers and added to an...

TiN and CrN single layer thin films along with TiN/CrN multilayer thin film, which has an average layer thickness of 4nm were deposited on WC substrates by a commercially used unbalanced DC magnetron sputtering. The microstructure and mechanical properties of the as-deposited films were investigated. The TiN/CrN multilayer thin film has a single ph...

Selective growth of ZnO nanorod arrays with well-defined areas was developed to fabricate the NO2 gas sensor. The seed solution was ink-jet printed on the interdigitated electrodes. Then, vertically aligned ZnO nanorods were grown on the patterned seed layer by the hydrothermal approach. The influences of seed-solution properties and the ink-jet pr...

Transparent thin films of Ga-doped ZnO (GZO), with Ga dopant levels that varied from 0 to 7at.%, were deposited onto alkali-free glass substrates by a sol–gel process. Each spin-coated film was preheated at 300°C for 10min, and then annealed at 500°C for 1h under air ambiance. The effects of Ga dopant concentrations on crystallinity levels, microst...

In the present study, hybrid manganese oxide films with additions of multiwalled carbon nanotubes (MWCNTs) were prepared by sol–gel process. Manganese acetate was used as the precursors and MWCNTs were added during the process. The effects of MWCNT addition and post heat treatment on the material characteristics and pseudocapacitive performance of...