Dissertations / Theses on the topic 'Nickel coated carbon fiber'

A new method for pre-impregnating nickel coated carbon fiber with a thermoplastic polymer to make towpreg, similar to a recently developed coating-line by João P. Nunes et al and a new electrically conductive thermoplastic are developed. A melted bath was used to help mitigate health concerns and waste for dispersion of nickel coated carbon fibers (NCF) in low density polyethylene (LDPE). This towpreg was then mixed with more LDPE or a mixture of LDPE and nickel nanostrands (NiNS) to a desired filler volume fraction to test the electrical conductivity of the composite. Some of these mixtures were then injection molded and tested again for conductivity as well as tensile and impact strength and compared to each other and the non-injection molded samples. It was found that mixing NiNS into the polymer in addition to NCF created a more conductive part than with NCF alone, in a couple orders of magnitude. Also, the shorter the NCF were, the greater the contribution of the NiNS to the electrical properties of the NCF filled material. The tensile strength was increased by adding the NCF and NiNS, while the impact strength (toughness) decreased.

Carbon fiber reinforced plastic (CFRP) composites have extensive value in the aerospace, defense, sporting goods, and high performance automobile industries. These composites have huge benefits including high strength to weight ratios and the ability to tailor their properties. A significant issue with carbon fiber composites is the potential for catastrophic fatigue failure. To better understand this fatigue, there is first a huge push to measure strain accurately and in-situ to monitor carbon fiber composites. In this paper, piezoresistive nickel nanostrand (NiNs) nanocomposites were embedded in between layers of carbon fiber composite for real time, in situ strain monitoring. Several different embedding methods have been investigated. These include the direct embedding of a patch of dry NiNs and the embedding of NiNs-polymer matrix nanocomposite patches which are insulated from the surrounding carbon fiber. Also, two different polymer matrix materials were used in the nanocomposite to compare the piezoresistive signal. These nanocomposites are shown to display repeatable piezoresistivity, thus becoming a strain sensor capable of accurately measuring strain real time and in-situ. This patch has compatible mechanical properties to existing advanced composites and shows good resolution to small strain. This method of strain sensing in carbon fiber composites is more easily implemented and used than other strain measurement methods including fiber Bragg grating and acoustic emissions. To show that these embedded strain gages can be used in a variety of carbon fiber components, two different applications were also pursued.

Due to their unique properties, carbon fiber reinforced polymers (CFRP) are becoming ever more prevalent in today's society. Unfortunately, CFRP suffer from a wide range of failure modes and structural health monitoring methods are currently insufficient to predict these failures. It is apparent that self-sensing structural health monitoring could be advantageous to protect consumers from catastrophic failure in CFRP structures. Previous research has shown that embedded nickel nanostrand nanocomposites can be used to instantaneously measure strain in carbon fiber composites, but these methods have been severely limited and can induce high stress concentrations that compromise the structural integrity of the carbon fiber structure. In this research the strain sensor material and the connective circuitry to the sensor are analyzed to improve the practicality of in situ strain sensing of carbon fiber structures. It has been found that the use of nickel nanostrands embedded directly onto carbon fiber as a strain sensor material has no advantages over a carbon fiber strain sensor alone. Additionally, it has been shown that the circuitry to the strain sensor plays a critical role in obtaining a strong, consistent piezoresistive signal that can be related to strain. The use of nickel coated carbon fiber in the circuitry has been evaluated and shown to reduce the noise in a piezoresistive signal while allowing for remote strain sensing from greater distances away from the strain location. The piezoresistive strain sensing utilized in the tested sensor designs relies on electrons tunneling through an insulting barrier between two conductors. This phenomenon is known as quantum tunneling. Two factors - tunneling barrier height and gap distance - affect the probability of quantum tunneling occurring. Thus, to accurately model and predict the piezoresistivity of nanocomposites these two parameters must be known. Through the use of dielectric spectroscopy the gap distance can be determined. Using nanoindenting, the barrier height for various polymers was also determined. The measured values can be used, in future work, to improve the modeling of nickel nanostrand nanocomposite.

碩士
國立虎尾科技大學
機械設計工程系碩士班
105
The results of this paper can make the bearing bear a bigger load,in practical applications can reduce the bearing size. Carbon fibers are made by casting to produce bromide and anodized for surface treatment. These two way and general carbon fibers are coated with nickel and copper,and the fibers are used to strengthen the tin-lead alloy composite. The fibers were brominated for 48 hours by bromine vapor and then desorbed at 200c in air for 12 hours；the other fibers involved electrochemical etching in a dilute sodium hydroxide electrolyte for 3 minutes. The experimental results show that the composites containing coated treated carbon fibres had higher tensile and shear strength than the ones containing coated pristine carbon fibres.Moreover,the composite with coated brominated carbon fibres had better tensile strength and shear strength than the surface treatment. In addition,the study of buckling analysis is mainly to explore the general metal-based composite materials and carbon fiber,tin-lead mixing ratio of the elongated hollow cylinder,the results of the deformation produced by a load compression are compared.

碩士
國立交通大學
機械工程學系
98
Physical properties are tunable by mixing fibers into the base material. Product anisotropy is achieved by controlling fiber alignment during the formation process. The researchers in this study manufactured a rectangular plate with anisotropic physical properties. The plate contained nickel-coated carbon fiber of high electrical conductivity and epoxy resin with a supreme physical property. An electrical and electromagnetic field generator was designed and fabricated to modulate electric and electromagnetic fields during solidification in the casting process. This study investigated fiber alignment of nickel-coated carbon products under the influence of different force fields. In the first section of experiments, the effects of electric and electromagnetic fields on fiber alignment were examined. This study utilized Optical microscopy (OM) to observe alignment of fibers, and penetrative conductivity measurement devices for fiber alignment verification were used. The researchers treated epoxy resin with an electric field to induce fiber alignment. Electric field experiments revealed that, the fibers did not satisfy electrophoresis properties and failed to aggregate and align when no electrical transition and aggregation occurred. The procedure of using the electric field to induce fiber alignment in epoxy resin is not applicable for mass production of virtual products with high electrical conductivity. The results of electromagnetic field experiments demonstrated that nearly all fibers aligned perpendicular to the magnetic field under certain conditions: such as, system magnetic flux density 0.069 Tesla, specimen thickness 2 mm, fiber content 0.5 wt percentage, length 1 mm, and certain resin viscosity. Compared to specimens that did not undergo aligning treatment, the penetrative conductivity (under 200MΩ) increased from 18.75% to 84.37%. The study used the experimental conditions fiber density 0.4, 0.6, and 0.8wtpercentage, length 2mm. The penetrative conductivity decreased while the fiber content increased. Fiber content ranged from 100%, 75%, and 72.9%with changed conductivity from 25, 125, and 250 Ω. The method of inducing fiber alignment with electromagnetic fields is applicable to the manufacture and development of products requiring anisotropic properties under certain levels of enhancement of system magnetic flux density. Research reports on fiber alignment control of nickel-coated carbon and its application in manufacturing fuel cell bipolar plates are nonexistent. The second phase of the experiment focused on whether the procedure of fiber alignment along the penetration direction of the epoxy resin rectangular plate is applicable to fuel cell bipolar plates. The researchers milled the composite and graphite plates to create serpentine flow fields. These two materials were compared for single cell power generation performance. Results showed that the composite of interest qualified under the Department of Energy (DOE) requirements for thermal properties, gas permeability, and corrosion resistance for fuel cell bipolar plates. The maximum power density of the composite bipolar plate was 1% (2.1mW) of the graphite counterpart under the conditions of fiber content 0.4 wt%, length 2 mm, magnetic flux density 0.069 Tesla, and plate dimensions of 63×54×2 mm. The maximum power density results were due to the greater penetrative resistance of the composite bipolar plate. The researchers utilized composite material with a planar conductivity of greater than 200MΩ; therefore, the electricity generated was mainly due to the conductive current provided by the penetrative conductivity of the bipolar plate. The study concludes that the procedure of conductive fiber alignment along with penetrative direction of fuel cell bipolar plates may be used in fuel cell applications.

碩士
逢甲大學
材料科學與工程學系
106
In this research, we change the metal-current-conductor of super-capacitor by PAN-based carbon fiber cloth. Using activated-carbon improves the specific area of electrode, and carbon-black for the conductivity-raising of electrode. Electrical-analysis is conducted under symmetrical full-cell. The parameter of electrode is adjusted by the condition of energy efficiency. Because the slurry of coating is made by blending, the viscosity of slurry will be raised while the NMP content goes down. The ratio of carbon black in slurry also influences the viscosity and uniformity for coating process. The NMP contents are changed from 65 to 90 times of Polyvinylidene fluoride (PVDF) mass for energy efficiency choosing. The 85 times is the best parameter. And the viscosity range is set under 2.45 (Pa.s) based on 70 times for following studies. The change of conductivity and current-tolerance of electrodes can be observed from the ICR and CV analysis. In GCD analysis, the 85CB07 is stable and has 143(F/g) of the capacitance in 1A/g and 3A/g current density. In 5A/g and 7A/g, the 90CB13 is more stable because the higher conductivity value and has the highest capacitance 150(F/g). The 75CB04 and 85CB07 have the better energy retention since the ions diffusion effect. The 85CB07 and 90CB13 are also analyzed by EIS. The equivalent circuit is simulated as reference for understanding difference of parameter and future application. According all analysis and purpose of application, the 85CB07 is the best parameter in this study.

碩士
逢甲大學
紡織工程所
91
ABSTRACT In this study, the carbon fiber reinforced composite materials were used as the substrates for electroless copper plating. The surface of the substrates was ground with different abrasive paper (physical roughness) and/or chemical roughness, and then performed electroless copper plating with different plating bath conditions of pH value. It is hope to find the optimum pretreatment condition that could get higher adhesion strength between the copper film and the composite substrates. In addition, microscope was used to observe the situation of the composite’s roughness and the bonding behavior between composite and copper film. Based on the experimental results, the surface of composite was treatment by chemical etching exhibited higher adhesion strength of 2.63 MPa. The optimum operating conditions for the copper electroless plating have been obtained, including concentrations of copper salt, ethylenediamine tetraacetic acid, formaldehyde solution, and sodium hydroxide of the plating bath. By using the initial rate method, the kinetics of reaction and the activation energy of this study were obtained, shown as the following: Ea= 2588.302 cal/mol

碩士
國立台灣工業技術學院
化學工程技術研究所
85
This article aimed at comparing the catalytic properties of activated carbon and carbon fiber supported nickel catalysts for the carbonylation of methanol. The compared items included the physical properties, the selectivity, and the deactivation of the catalysts. The effect of MeI concentration on the carbonylation was also investigated. The instruments used for the research were BET, chemisorption, EDS of SEM system, TPD, and a reaction system. The results indicated Ni/C catalyst had larger BET surface area and pores volume than Ni/FC. Ni/C had wider pores distribution than Ni/FC. The dispersion of nickel on Ni/C was lower than that on Ni/FC. There were several different sites on Ni/FC for MeOH and MeI adsorption but only one on Ni/C. Ni/FC catalyst could adsorbs more CO than Ni/C catalyst. Ni/FC catalyst''s surface was acidic and contained well dispersed phosphor and sulfur . The conversion of methanol on Ni/FC was higher than that on Ni/C. But the selectivity of AcOMe and AcOH on Ni/FC catalyst is lower than that on Ni/C. The highest activity of Ni/FC and Ni/C catalysts on methanol carbonylation was reached at 300oC.A further increase in the temperature would not increase the activity. The highest catalyst activity was obtained by a feed with 0.1 MeI/MeOH molar ratio. Ni/C and Ni/FC deactivated slightly in the initial two hours on stream, then remained stable for the next 5h in operation.

碩士
國立中山大學
環境工程研究所
93
This study combined photocatalytic technology with activated carbon adsorption to decompose gaseous pollutants. Gaseous pollutants were initially adsorbed and concentrated by activated carbon and could be further decomposed more effectively by photocatalytic technology. This study coated TiO2 on the activated carbon fiber (ACF) by a sol-gel process for conducting the adsorption and decomposition of acetone in a batch reactor. Operating parameters investigated in this study included the initial concentration of acetone (13.6 μM and 27.2 μM), reaction temperature (50℃~70℃), oxygen concentration (0.5%~20%), and water vapor (0 μM~244.9 μM). The incident UV light of 365 nm was irradiated by a 15-watt low-pressure mercury lamp placing above the photocatalytic batch reactor. The ACF coated with TiO2 was placed in the center of the reactor. Acetone was injected into the reactor to conduct photocatalytic tests. Reactants and products were analyzed quantitatively by a gas chromatography with electron capture detector (GC/ECD) and a flame ionization detector followed by a methaneizer (GC/FID-Methaneizer). Results from the photocatalysis tests indicated that, among the commercial TiO2 (Degussa P-25), NO3-/TiO2 and SO42-/TiO2, SO42-/TiO2 had the best photoactivity reduced acetone concentration and reaction time substantially. The end products was mainly CO2 and CO, which resulted in the mineralization ratio above 95%. Results from the operating parameter tests revealed that the increase of the initial acetone concentration enhanced the amount of acetone adsorbed on the ACF, which however did not increase the reaction rate of acetone. Although the increase of reaction temperature could reduce the amount of acetone adsorbed on the ACF, decomposition rate of acetone could be promoted, so as the yield rate and mineralization ratio of products (CO2 and CO). Increasing oxygen concentration did not influence the decomposition significantly except for oxygen concentration lower than 1%. The increase of water vapor would slightly decrease the amount of acetone adsorbed on the ACF, which did not decrease the decomposition of acetone anyway. This study revealed that the decomposition of acetone on TiO2/ACF can enhance the mass transfer of acetone substantially.

碩士
國立高雄應用科技大學
機械與精密工程研究所
104
In this paper, notched long period fiber grating (NLPFG) applicated was applied on CO2 gas measurement and CO2 gas concentration measurement. This NLPFG is fabricated by inductive couple plasma etching (ICP) . The effects of the designed parameter (i.e different fiber diameter and grating period) are studied to explore the characterization of NLPFG. The characterization of NLPFG test show the wavelength of NLPFG produced a red shift with decreases fiber diameter or increases period. In contrast, when increases fiber diameter or decreases period are blue shift. In CO2 gas sensor experiment, the sensor is composed of NLPFG coating with a sol–gel containing indicator dye of thymol blue. This transmission loss of NLPFG CO2 gas sensor increased when this NLPFG CO2 gas sensor absorbed carbon dioxide gas. Different diameters of NLPFG measured carbon dioxide gas. The sensitivity of carbon dioxide gas sensor increased as NLPFG gas sensor of diameter decreased. The fiber of 35 μm and period of 580 μm have a maxima transmission loss of 2.08 dB.The sensitivity in concentration is 0.112dB/%.

碩士
國立雲林科技大學
化學工程與材料工程系碩士班
100
Surface functionalization of PAN-type carbon fiber proceed to eletroless plating copper-nickel in this study, carbon fiber is treated by using various pretreated that include toluene cleaning, high temperature furnace processing, and it divided sulfuric acid and nitric acid in the volume ratio 3: 1 etc. And then, the different proportion of 3-aminopropyl trimethoxysilane (APTS) coupling agents grafted on the carbon fiber. In this paper, we try to use other silane coupling agents that include KBM-503、VTMOS、TEOS and so on. The type of silane coating is hydrolysis-condensation reaction or thionyl acyl chloride. Surface functionalization of carbon fiber is coated a layer of copper by eletroless planting, and finally, eletroless nickel planting is coated on carbon fiber. So, in order to make the conductivity increase and with the magnetic characteristics. Expected by the silane, eliminating the expensive active agent palladium salt on the process, and it can also achieve adhesion between carbon fiber and metal, the traditional electroless plating system of the role of activator and Sensitization can be replaced. In this study, surface modification of the carbon fiber is electroless plated of Cu-Ni, via a series of characterization, such as SEM, EDS and XRD, resistance properties measured, Metallography microscope and so on. After characterization,It is known acid treated carbon fiber is easy to coated by silane coupling agents, even if, copper and nickel-metal can be also restored on the carbon fiber without sensitization activation, after electroless planted on carbon fiber, the electric conductivity is lower than un-treated carbon fiber.

Yes
Nickel coated multi-walled carbon nanotubes (NiMCNTs) are favorable reinforcing nanofillers for modifying cementitious composites due to their preeminent mechanical properties, electrical conductivity, thermal properties and dispersibility. This paper investigates the mechanical properties and compatibility of NiMCNTs filled cementitious composites, having two different types of cement, two water to cement ratios, and two dosages of five types of NiMCNTs. The results show that 0.06 vol.% NiMCNTs with small aspect ratios can significantly enhance the mechanical properties of cementitious composites, while NiMCNTs with large aspect ratios play a better strengthening effect at 0.03 vol.%. The flexural strength/toughness of cementitious composites containing 0.06 vol.% NiMCNTs with an aspect ratio of 200 can be increased by 19.65%/116.78%. Adding 0.03 vol.% NiMCNTs with an aspect ratio of 1000 enhances the compressive strength/toughness of composites by 18.61%/47.44%. Besides, NiMCNTs have preferable compatibility to cementitious composites prepared by P·O 42.5R cement with a water to cement ratio of 0.3. The enhancement mechanism is related to the denser microstructure and effective suppression of microcracks in the cementitious matrix by NiMCNTs with filling, bridging and pull-out effects, as well as the high interface bond strength between NiMCNTs and matrix. A strength prediction model for NiMCNTs reinforced cementitious composites is also established to estimate the mechanical strength of cementitious composites containing NiMCNTs with different aspect ratios/contents, showing a small relative error within ±6%/±13% for predicted flexural/compressive strength values in comparison with the experimental results.
Funding supported from the National Science Foundation of China (51908103 and 51978127), and the Fundamental Research Funds for the Central Universities (DUT21RC(3)039).
The full-text of this article will be released for public view at the end of the publisher embargo on 28 July 2022.

碩士
國立清華大學
材料科學工程學系
106
Transition-metal oxides or hydroxides on nanostructured supports have been regarded as promising electrode materials for high-performance supercapacitors due to their high power density, good energy density, excellent cycle stability, and long lifetime. In this work, a high-performance supercapacitor based on NixCo1-x(OH)2 nanoflakes modified ZnO nanowires (NWs) was developed. The ZnO NWs were synthesized on carbon fiber (CF) by chemical bath deposition, followed by pulse electrodeposition of NixCo1-x(OH)2 nanoflakes on the surface of ZnO NWs. The effects of the electrodeposition conditions along with the precursor variables were systematically investigated. The NixCo1-x(OH)2/ZnO NWs/CF hybrid nanostructure fabricated under the optimal conditions has exhibited a specific capacitance of 880.5 F/g, good rate capability, and cycling stability.

Trabalho Final do Mestrado Integrado em Medicina Dentária apresentado à Faculdade de Medicina
Objetivo: Este estudo pretende avaliar se um revestimento de diamond-like carbon em limas endodônticas mecanizadas de Níquel-Titânio (Hyflex CM, Hyflex EDM and Reciproc Blue) tem um efeito protetor da superfície contra corrosão por contacto com hipoclorito de sódio (NaOCl).Materiais e métodos: Um total de 12 limas foram divididas em 6 grupos: 2 limas Hyflex CM, 2 Hyflex EDM, 2 Reciproc Blue, 2 Hyflex CM com revestimento DLC, 2 Hyflex EDM com revestimento DLC e 2 Reciproc Blue com revestimento DLC. Uma lima de cada grupo foi sujeita a dois protocolos de imersão em NaOCl com análise de superfície através de microscopia eletrónica de varrimento realizada após o primeiro e previamente ao segundo protocolo. A segunda lima do grupo foi mantida tal como fornecida pelo fabricante. No primeiro protocolo de imersão, cada lima foi dinamicamente imersa durante 5 minutos em 4 ml de hipoclorito a 6% e a uma temperatura de 37ºC. De seguida, a lima foi retirada e dinamicamente imersa em água destilada durante 1 minuto, com secagem posterior. Após a análise de superfície, as limas foram sujeitas ao segundo protocolo de imersão, no qual foram imersas em hipoclorito a 6% e retiradas imediatamente a seguir. Posteriormente, foram colocadas num suporte sem qualquer manipulação durante 1 hora, após a qual foram lavadas com água destilada e posterior secagem. Todas as limas foram novamente analisadas através de microscopia eletrónica de varrimento. Adicionalmente, duas limas (Hyflex EDM com e sem revestimento DLC) foram sujeitas a fadiga cíclica num dispositivo especificamente desenvolvido para o efeito.Resultados: A lima Hyflex CM mostrou uma textura de superfície uniforme com marcas de maquinação visíveis, tendo essa textura sido mantida após o revestimento de superfície com DLC. Após o segundo protocolo de imersão, a lima deste sistema com revestimento mostrou perda de DLC na superfície de corte da mesma. Relativamente ao sistema Hyflex EDM, a distinção mais notável foi uma suavização do relevo na porção interna da hélice das limas após o revestimento. A análise de superfície do sistema Reciproc Blue mostrou uma textura de superfície uniforme com máquinas de maquinação, tendo também o relevo da superfície sido mantido após a adição do revestimento de DLC, tendo este também demostrado sinais de resistência aos protocolos de imersão em hipoclorito visto não se ter verificado perdas de material em nenhuma das observações. O teste de resistência à fadiga cíclica revelou sinais de desgaste na aresta de corte da lima do sistema Hyflex EDM sem revestimento e perda significativa de material de revestimento na porção interna da hélice da lima revestida, ainda que a aresta de corte permanecesse mais integra (também esta com perda de material de revestimento).Conclusões: Os resultados do presente estudo sugerem que não se verifica uma diferença apreciável entre limas revestidas e não revestidas com diamond-like carbon no que concerne à resistência à corrosão decorrente do contacto destes instrumentos com hipoclorito de sódio.
Aim: The purpose of this study was to determine if a diamond-like carbon (DLC) coating in NiTi alloy engine-driven endodontic files (Hyflex CM, Hyflex EDM and Reciproc Blue) can protect the surface against sodium hypochlorite (NaOCl) driven corrosion.Materials and Methods: A total of 12 files were split in six groups: 2 Hyflex CM files (size 25, .06 taper, 25 mm), 2 Hyflex EDM files (size 25/~ OneFile, 25mm), 2 Reciproc Blue files, 2 Hyflex CM (size 25, .06 taper, 25 mm) files with DLC coating, 2 Hyflex EDM files (size 25/~ OneFile, 25mm) with DLC coating and 2 Reciproc Blue files with DLC coating. One file from each group was subject to two NaOCl immersion protocols, with surface analysis performed in between through scanning electron microscopy (SEM), and the other was left untouched as received by the company. In the first experimental NaOCl protocol, files were dynamically immersed for 5 minutes in 4 ml of 6% sodium hypochlorite solution at 37 ºC. Subsequently, files were immediately submitted to dynamic immersion in distilled water for 1 minute and air dried. Following SEM, in a second immersion protocol, the previously immersed files were briefly immersed in 4 ml of 6% sodium hypochlorite solution, immediately removed, and left untouched for 1 hour, after which all files were rinsed with distilled water and air dried. All files were observed in SEM. Additionally, two files (Hyflex EDM with and without DLC coating) were submitted to cyclic fatigue in a specifically developed device.Results: Uncoated Hyflex CM file showed a uniform texture with machining grooves, preserved after coating, and loss of DLC coating material on the cutting edge of the instrument after the second immersion protocol, while with the Hyflex EDM system the main noticeable change was in the coated EDM file which revealed a less pronounced texture, with the pits, pores and voids in the inner section of the coil having a smoother relief. Surface analysis of uncoated Reciproc Blue revealed a uniform texture with machining grooves, also preserved by DLC coating, and no signs of failure to resist the immersion protocol in both observations. Cyclic fatigue resistance testing showed signs of wear on the cutting edge of the Hyflex EDM uncoated instrument and extensive loss of coating on the inner section of the coil of the DLC coated file with the edge appearing to be better preserved in the latter.Conclusions: Our findings suggest there’s no difference concerning sodium hypochlorite driven corrosion resistance among files with diamond-like carbon coating or in its original surface.

碩士
國立東華大學
光電工程學系
102
Owing to be provided with broader energy gap (3.37 eV), binding energy (60 meV) and greater photocatalytic activity, zinc oxide is widely applied to photoelectric element related works, the study is to fabricate porous zinc oxide photocatalyst bearing carbon fiber composite material under condition of ultrasonic assisted electrochemical in room temperature, and explore its antibacterial ability and conduct photocatalysis hydrogen generation experiment in self-made biofuel. In part 1, the study mainly adopts two different kinds of precursors of zinc acetate and zinc nitrate under ultrasonic assisted to conduct electrochemical deposition on ZnO photocatalyst materials on carbon fiber surface, attempts to find optimal auxiliary parameters in the process. On basis of XRD analysis, it is identified that the fabricated porous ZnO is provided with stronger diffraction peak as experimental parameter is under condition of 28 kHz, with positions of 32.8 and 34.4 degree in 2 angle, and relative crystal planes are 100 and 002 respectively. In cycling voltammetry analysis, it is found that the porous ZnO fabricated with zinc nitrate as precursor is provided with preferred oxidized electric current, where the maximum oxidized electric current can reach 79.5A under xenon lamp irradiation. In part 2, the study adopts the porous ZnO nano photocatalyst materials that fabricated with optimized parameter in part 1, to conduct experiment of photocatalysis escherichia coli antibacterial. As shown in the experiment results, the efficacy of escherichia coli antibacterial is provided with optimal escherichia coli antibacterial curve in first test, but, in second duplicated test, the antibacterial effect reduced to halve, further, in third test, the antibacterial effect is loss, and it is found in electron microscope images that the reason resulted in antibacterial curve uprising lies in ZnO stripping from carbon fiber substrate. In part 3, the study similarly adopts the porous ZnO nano photocatalyst materials that fabricated with optimized parameter in part 1, to conduct experiment of photocatalysis hydrogen generation. Firstly, it is found in the self-made biomass ethanol study, the self-made biomass ethanol fermenting concentration is affected by irradiated light source of various wavelength in the fermenting process, especially under dark condition, the biomass ethanol fabricated after one purification is able to reach concentration of 50 % above, relatively the concentration of biomass ethanol with red light assisted fermenting reaches only 40 %. And then, the fabricated 52 % biomass ethanol is used as sacrifice reagent to conduct photo-decomposition hydrogen generation experiment, and the hydrogen generation efficiency is about 301 mol hr-1.

碩士
國立臺北科技大學
有機高分子研究所
102
Carbon dioxide (CO2) is known as harmful gas. When the concentration of CO2 is up to 800 ppm indoors, it would make some people feel dizzy and uncomfortable. This study is to fabricate a hollow fiber gas separator system to reduce the CO2 concentration indoors. In this study, a CO2 gas separation system is setup base on the membrane separation via the surface modification of commercial polysulfone (PSF) porous membranes to produce a gas selective layer. Dip coating method is applied to modify the surface of hollow fiber membrane with rich of hydroxyl and amine functional groups to enhance the CO2 gas absorption. Dip coat aqueous solution consists of polyvinyl-alcohol (PVA) and surface been amine modified meso-porous material SBA-15-NH2. The modified membranes were characterized by SEM and XPS analysis. The gas separation results show that at lower input gas pressure, CO2 gas has larger gas permeability (GP) value than nitrogen at room temperature. When applying the dip coat condition of 0.5 wt% PVA and 0.1wt% SBA-15-NH2, the GP values are 1.1 and 0.2 (×10-3, cm3/s．cm2．cm-Hg) for CO2 and nitrogen at gas pressure of 3.75 cmHg respectively and the CO2/N2 gas selectivity ratio is 5.6.

In this thesis work, a systematic quantitative study has been undertaken, on the performance of etched fiber Bragg Grating (FBG) sensors in the investigation of surface molecular adsorption in real-time; it is shown that the limit of detection (LOD) of FBGs etched below 2 microns diameter, is better compared to prominent optical label-free molecular sensing techniques such as Surface Plasmon Resonance (SPR). Novel fiber optic sensors based on FBG and etched FBG with various nano materials (polyelectrolytes, carbon nanotubes, hydrogel, metals and chalcogenides) coated on the surface of the core or cladding, have been proposed for sensing multi parameters such as pH, protein, humidity, gas, strain, temperature, and light etc. Besides being reproducible and repeatable, the proposed methods are fast, compact, and highly sensitive. A novel optical instrument has also been developed to measure angular deviation, binocular deviation and refractive index of glass slabs, and liquids, based on a shadow casting technique. This method uses the deviation in the geometrical shadow cast by a periodic dot pattern trans-illuminated by a distorted light beam from the transparent test specimen relative to a reference pattern.

碩士
大同大學
材料工程學系
86
In this thesis, the carbon fibers are treated by the method of co-deposited techniques, where the PTFE powders are incorporated into the electroless nickel baths with the aid of the surfactants. A various of surfactants are tested to improve the ablility of suspending the PTFE pweders in the bath. The electroless nickel/PTFE carbon carbon fibers (FENCF) by our codeposited technique and the simple electroless nickel carbon fibers (ENCF) are cut into 6 mm length and compounded with ABSm PC/ABS(70/30) and PC/ABS (80/20) by adequate antioxidants and compatibilizer to find the composite with good mechanical properties and EMI shielding effectiveness(SE). The EMI shielding effectiveness of the composites are tested by the method of coaxial tube. 　　As predicted, the experimental results show the compounding of FENCF composites have excellent processibility by the low torque values than that of ENCF composites. For the ABS matrix, the FENCF/ABS composites have better mechanical properties than ENCF/ABS with higher values of tensile strength and Young''s modulus about 2.5 MPa and 250 MPa, respectively. On the other hand, it''s SE is lower than that of ENCF/ABS about 10dB. This investigation also indicate that the compounding of ENCF or FENCF into the PC/ABS matrix do not result in significant difference in their mechanical properties; however, the SE of ENCF''s composites have higher values about 15 dB than that of FENCF''s composites.

As demands for alternative sources of energy increase over the coming decades, water electrolysis will play a larger role in meeting our needs. The oxygen evolution reaction (OER) component of water electrolysis suffers from slow kinetics. An efficient, inexpensive, alternative electrocatalyst is needed. We present here high-activity, low onset potential, stable catalyst materials for OER based on a hierarchical network architecture consisting of Fe and Ni coated on carbon fiber paper (CFP). Several compositions of Fe-Ni electrodes were grown on CFP using a hydrothermal method, which produced an interconnected nanosheet network morphology. The materials were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Electrochemical performance of the catalyst was examined by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The best electrodes showed favorable activity (23 mA/cm², 60 mA/mg), onset potential (1.42 V vs. RHE), and cyclability.
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碩士
國立雲林科技大學
環境與安全衛生工程系
104
Nickel-plated carbon fiber has many advantage: good rigidity, strength, small thermal expansion coefficient and specific gravity, lightweight and has properties of metal, best EMI of shielding efficiency and able to recycled utilization, it is widely used in the aerospace, defense and electronic products. For the preparation of nickel-plated carbon fiber, make the metal coat on carbon fiber with electroless plating, traditionally, it should conduct sensitization, activation process, but carried out sensitization, activation need to use toxic tin chloride and expensive palladium chloride, this study adopt a silane coupling agent APTS (3- aminopropyl trimethoxy silane) with 1,3,5,10,15 and 20 g replace traditional sensitization and activation process, then conduct electroless nickel plating experiment Therefore, in order to replace the traditional post-sensitization, activation, this study used silane coupling agent about 1, 3, 5, 10, 15 and 20 g of APTS ((3- aminopropyl) triethoxy silane) treatment of carbon fiber, and then electroless nickel plating experiments and the analysis by SEM, EDX, FTIR, XRD and TGA. Via SEM, EDX and FTIR results show, APTS really plating carbon fiber surface; The carbon fiber deal with 1g and 3g APTS can be successfully prepared nickel-plated carbon fiber; In XRD analysis showed 2θ = 32.5 ° when an amorphous phase structure NiP2 existence; The TGA analysis can be seen in 1 g APTS-CF / Ni its pyrolysis temperature is higher than after 3 g APTS-CF / Ni, represents 1 g APTS-CF / Ni has better thermal stability.

碩士
中興大學
材料工程學系所
95
The effect of different film thicknesses on the hermetically carbon-coated optical fiber prepared by plasma enhanced chemical vapor deposition method at a fixed hydrogen/acetylene ratio is investigated. Twelve kinds of film thickness are selected as 50, 75, 88, 100, 125, 138, 150, 200, 300, 400, 500, and 600 nm. The microstructure, optical property, mechanical property, surface roughness, water-repellency, surface morphology are analyzed by Raman scattering spectroscopy, Fourier transforms infrared spectrometry, UV/Vis spectrophotometer, residual stress measurement, atomic force microscope, contact angle meter, optical microscope, and scanning electron microscopy, respectively. The hermetic property of carbon-coated optical fibers was examined through the immersion in the liquid nitrogen for one day and thermal stress induced cracks on the surface of carbon coating was observed by optical microscope. Results indicate that if the film thickness increase from 50 nm to 600 nm, the disorder phase in carbon coating structure becomes more conspicuous. If the film thickness is 88 nm, the carbon coating has a compact structure, and the residual stress of carbon coating rises up to a critical value. Moreover, the carbon coating with thickness of 88 nm has a higher water-repellency and a lower surface roughness, and can sustain the thermal loading. Hence, it is found that the carbon coating prepared at the film thickness of 88 nm is the best for hermetic optical fiber coating.

碩士
國立中興大學
材料科學與工程學系所
97
The study used different weight percent conductive paint with silver-coated copper flakes in epoxy on carbon fiber reinforced plastic surface , employ the electric conductivity of paint for copper electroplating in copper sulfate bath to avoid the complex processes and surface defects of electro-less plating on carbon fiber reinforced plastic surface. The result of the experiment , the electric resistance of carbon fiber reinforced plastic tube surface is about 1.279x10-3Ω.㎝ 2 , it can’t plated copper with copper sulfate bath. There is not having continuous electric conduction net and complete electroplate layer of conductive paint while the silver-coated copper flakes less than 20 weight percent in epoxy. There is complete electroplate layer of the conductive paint while the silver-coated copper flakes more than 30 weight percent in epoxy. The electric resistance of conductive paint while the silver-coated copper flakes more than 40 weight percent in epoxy is 10-5Ω.㎝ 2. There is lower electric resistance(70%、1.265 x10-5Ω.㎝ 2),smooth electroplate surface and better combine while the conductive paint having higher weight percent of silver-coated copper flakes in epoxy. The conductive paint of 50 weight percent silver-coated copper flakes in epoxy had better cathode efficiency. The copper electrodeposited on electrics discharge point of conductive paint coated surface while the conductive paint had not enough of electric conduction net. The electroplate layer was fine island crystal and transverse growth by leveling effect. The electric discharge point is uniform distributed over conductive paint while the conductive paint had enough electric conduction net. The copper uniform electrodeposited fine particle or branch crystal on conductive paint surface. The electroplate layer was full covered with conductive paint surface and vertical growth of substructure. The XRD of copper electroplated on conductive paint surface was 100(43.22°)、34(50.32°)、18(74.07°).