Browsing by Issue Date, starting with "2017-03-07"

Now showing 1 - 20 of 14317

Estimating Percent Crystallinity of Polyethylene as a Function of Temperature by Raman Spectroscopy Multivariate Curve Resolution by Alternating Least Squares
(2017-03-07)
Samuel, Ashok Zachariah
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Lai, Bo-Han
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Lan, Shih-Ting
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Ando, Masahiro
;
Wang, Chien-Lung
We have recently demonstrated a methodology to estimate the percent crystallinity (PC) of polymers directly with Raman spectroscopy and multivariate curve resolution (MCR) by alternating least-squares (ALS). In the MCR-ALS methodology, the Raman spectrum of a semicrystalline polymer is separated into two constituent components (crystalline and molten/amorphous) and their corresponding concentrations. The methodology necessitates that the Raman spectrum at any temperature be a linear combination of two MCR spectral components (one molten and one crystalline). This is true in the case of simple systems such as crystalline pendant alkyl domains in polymers (Samuel et al. Anal. Chem. 2016, 88, 4644). However, in the case of main chain polymer crystals (e.g., polyethylene), the situation can be complicated owing to several molecular changes in the lattice in addition to conformational reorganizations during melting. Under this circumstance, a simple two-state model may not be adequate and we describe the modifications required to treat such systems, keeping the basic principles of the proposed methodology unchanged. A comparative study with wide-angle X-ray scattering (WAXS) and Raman spectroscopy is also performed to substantiate our findings. In addition to estimating percent crystallinity (PC), our methodology is capable of revealing additional information, such as interchain interactions in crystal lattice, that in principle will help distinguishing polymorphic transformations, subtle changes in lamellar lattice dimensions, and other phase changes in polymers.
Probing Skin for Metabolites and Topical Drugs with Hydrogel Micropatches
(2017-03-07)
Dutkiewicz, Ewelina P.
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Chiu, Hsien-Yi
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Urban, Pawel L.
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應用化學系
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應用化學系分子科學碩博班
Sampling the skin surface is a convenient way to obtain biological specimens bearing clinically relevant information. Hydrogel micropatches enable noninvasive collection of skin excretion specimens, which can subsequently be subjected to rapid mass spectrometric analysis providing insights into the skin metabolome.
Enhanced thermoelectricity of three-dimensionally mesostructured BixSb2-xTe3 nanoassemblies: from micro-scaled open gaps to isolated sealed mesopores
(2017-03-07)
Chen, Tsung-Han
;
Lin, Ping-Yu
;
Chang, Hsiu-Cheng
;
Chen, Chun-Hua
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材料科學與工程學系
We describe an innovative interfacial design concept and nanostructuring of novel BixSb2-xTe3 (BST) nanoassembled films comprising unique air-solid interfaces from micro-scaled open gaps to isolated sealed mesopores, and high-quality solid-solid ones including the coherent grain boundaries and specific twins, utilizing pulsed laser deposition (PLD), for potentially activating multiple thermoelectric enhancing mechanisms. The unusual mesopore embedded BST films exhibit the highest power factor of similar to 33 mu W cm(-1) K-2, which is comparable to or higher than the previously reported values for BST, and the corresponding relatively low thermal diffusivity in contrast to that for dense pore-less BST films evidently reveals the crucial role of the three-dimensionally and densely arranged air-solid interfaces in significantly arising the phonon scattering.
Luminance enhancement in quantum dot light-emitting diodes fabricated with Field's metal as the cathode
(2017-03-08)
Basilio, Carlos
;
Oliva, Jorge
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Lopez-Luke, Tzarara
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Pu, Ying-Chih
;
Zhang, Jin Z.
This work reports the fabrication and characterization of blue-green quantum dot light-emitting diodes (QD-LEDs) by using core/shell/shell Cd1-xZnxSe/ZnSe/ZnS quantum dots. Poly [(9,9-bis(3'-(N, N-dimethylamino) propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN) was introduced in order to enhance the electron injection and also acted as a protecting layer during the deposition of the cathode (a Field's metal sheet) on the organic/inorganic active layers at low temperature (63 degrees C). This procedure permitted us to eliminate the process of thermal evaporation for the deposition of metallic cathodes, which is typically used in the fabrication of OLEDs. The performance of devices made with an aluminum cathode was compared with that of devices which employed Field's metal (FM) as the cathode. We found that the luminance and efficiency of devices with FM was similar to 70% higher with respect to those that employed aluminum as the cathode and their consumption of current was similar up to 13 V. We also demonstrated that the simultaneous presence of 1,2-ethanedethiol (EDT) and PFN enhanced the luminance in our devices and improved the current injection in QD-LEDs. Hence, the architecture for QD-LEDs presented in this work could be useful for the fabrication of low-cost luminescent devices.
USE OF KNOWN COMPOUNDS AS D-AMINO ACID OXIDASE INHIBITORS
(2017-03-08)
TSENG, Yufeng, Jane
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LIU, Yu-Li
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SUN, Chung-Ming
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HWU, Hai-Gwo
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LIU, Chih-Min
Highly Sensitive Aluminum-Based Biosensors using Tailorable Fano Resonances in Capped Nanostructures
(2017-03-08)
Lee, Kuang-Li
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Hsu, Hsuan-Yeh
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You, Meng-Lin
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Chang, Chia-Chun
;
Pan, Ming-Yang
Metallic nanostructure-based surface plasmon sensors are capable of real-time, label-free, and multiplexed detections for chemical and biomedical applications. Recently, the studies of aluminum-based biosensors have attracted a large attention because aluminum is a more cost-effective metal and relatively stable. However, the intrinsic properties of aluminum, having a large imaginary part of the dielectric function and a longer evanescent length, limit its sensing capability. Here we show that capped aluminum nanoslits fabricated on plastic films using hot embossing lithography can provide tailorable Fano resonances. Changing height of nanostructures and deposited metal film thickness modulated the transmission spectrum, which varied from Wood's anomaly-dominant resonance, asymmetric Fano profile to surface plasmon-dominant resonance. For biolayer detections, the maximum surface sensitivity occurred at the dip of asymmetric Fano profile. The optimal Fano factor was close to -1.3. The wavelength and intensity sensitivities for surface thickness were up to 2.58 nm/nm and 90%/nm, respectively. The limit of detection (LOD) of thickness reached 0.018 nm. We attributed the enhanced surface sensitivity for capped aluminum nanoslits to a reduced evanescent length and sharp slope of the asymmetric Fano profile. The protein-protein interaction experiments verified the high sensitivity of capped nanostructures. The LOD was down to 236 fg/mL.
Plasmon-induced photoelectrochemical biosensor for in situ real-time measurement of biotin-streptavidin binding kinetics under visible light irradiation
(2017-03-08)
Guo, Jingchun
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Oshikiri, Tomoya
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Ueno, Kosei
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Shi, Xu
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Misawa, Hiroaki
We developed a localized surface plasmon-induced visible light-responsive photoelectrochemical (PEC) biosensor using a titanium dioxide (TiO2) photoelectrode loaded with gold nanoislands (AuNIs) for in situ real-time measurement of biotin-streptavidin association. As a proof of concept, self-assembled thiol-terminated biotin molecules bound on a AuNls/TiO2 photoelectrode were successfully utilized to explore the photocurrent response to streptavidin-modified gold nanoparticle (STA-AuNP) solutions. This plasmon-induced PEC biosensor is simple and easy to miniaturize. Additionally, the PEC biosensor achieves highly sensitive measurements under only visible light irradiation and prevents the UV-induced damage of samples. Furthermore, a novel approach has been proposed to realize the real-time monitoring of biotin-STA binding affinities and kinetics by analyzing the PEC sensing characteristics. This PEC biosensor and novel analysis method could provide a new approach for the specific electrical detection and real-time kinetic measurements for clinical diagnostics and drug development. (C) 2016 The Authors. Published by Elsevier B.V.
PLANTING BASEPLATE ASSEMBLY
(2017-03-09)
Jehng-Jung KAO
;
Chao-Han LEE
A planting baseplate assembly comprises a base, a water storage device, and a diversion element. The base includes a base body; a drain hole penetrating the upper and lower surfaces of the base body, wherein a connection member extends downward from the lower surface of the base body; a plurality of water guiding trenches mutually intersecting on the upper surface of the base body and interconnecting with the drain holes for water drainage; and a plurality of overflow holes disposed in and penetrated the water guiding trenches for water drainage. The water storage device includes a storage body and a connection neck to fix with the connection member. The diversion element is inserted through the drain hole and extended to the water storage device. The planting baseplate assembly is easy to assemble, favorable to environmental protection, and applicable to green roofs and various planting apparatuses.
Flow Dehydration and Hydrogenation of Allylic Alcohols: Application to the Waste-Free Synthesis of Pristane
(2017-03-10)
Furuta, Akihiro
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Hirobe, Yuki
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Fukuyama, Takahide
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Ryu, Ilhyong
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Manabe, Yoshiyuki
Hydroxy-substituted sulfonic acid functionalized silica (HO-SAS) in combination with THF containing a small amount of water as a solvent proved to be a reliable system for the dehydration of allylic alcohols. This process generally caused dehydration within 1 min through a column reactor charged with HO-SAS. The flow dehydration was sequenced by flow hydrogenation, which resulted in the synthesis of pristane. A scalable flow synthesis of pristane was successfully performed and afforded 10 g of pristane after an operation of 2 h. We also performed dehydration and hydrogenation by using a mixed column of HO-SAS and 10 % Pd/C.
思覺失調　汙名抹掉
(2017-03-12)
林宥成
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Department of Communication and Technology
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傳播與科技學系
思覺失調就是以前所謂的精神分裂，應該深入理解此類常見的精神疾病，不應給予歧視與汙名化。
簡繁爭辯　孰能勝出
(2017-03-12)
何家沂
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Department of Communication and Technology
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傳播與科技學系
簡述簡體字與繁體字的爭論緣由，以及保存繁體字的意識興起。
明日教育　讓人才贏在未來
(2017-03-12)
韓舒容
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Department of Communication and Technology
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傳播與科技學系
放眼世界、立眼台灣，在教育趨勢中，掌握未來教育的核心價值。
台灣電視劇　現狀與困境
(2017-03-12)
李瑞彥
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Department of Communication and Technology
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傳播與科技學系
探討台灣電視劇重視電視收視率，而有可能忽略網路族群，其中會存在的誤差。
平凡卻不簡單　勇敢逐夢
(2017-03-12)
林孟盈
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Department of Communication and Technology
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傳播與科技學系
評論2016年秋季日劇《校對女王》。
零安樂上路　是否從此安樂
(2017-03-12)
陳昱彣
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Department of Communication and Technology
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傳播與科技學系
介紹2017年2月上路的「動物零安樂死」。
影視文創　台灣民俗品牌力
(2017-03-12)
何書馨
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Department of Communication and Technology
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傳播與科技學系
對於台灣宗教信仰的底蘊多采多姿，結合傳統民俗的流行影視與創意產業，將是打造台灣文化品牌的重要力量。
虛擬工業　遊戲開發知多少
(2017-03-12)
何肇耕
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Department of Communication and Technology
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傳播與科技學系
遊戲開發是遊戲產業最重要的部分，開發一款遊戲的過程可說是千辛萬苦。
隧道崩塌　顯露赤裸人性
(2017-03-12)
范晨星
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Department of Communication and Technology
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傳播與科技學系
探討韓國電影「失控隧道」，天災人禍中漸漸崩塌的，除了隧道，更是人心。
毛利語　母語復甦典範
(2017-03-12)
王韋翔
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Department of Communication and Technology
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傳播與科技學系
世界上有許多語言面臨消失的危機，從毛利人的案例，看見語言復甦與保存。
饒富韻味　舌尖舞動
(2017-03-12)
王羽廷
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Department of Communication and Technology
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傳播與科技學系
簡介饒舌音樂。