Browsing by Issue Date, starting with "2017-04-21"

Now showing 1 - 20 of 14046

Directed motion from particle size oscillations inside an asymmetric channel
(2017-04-21)
Makhnovskii, Yurii A.
;
Sheu, Sheh-Yi
;
Yang, Dah-Yen
;
Lin, Sheng Hsien
;
應用化學系
The motion of a spherical Brownian particle in an asymmetric periodic channel is considered. Under an external periodic stimulus, the particle switches between two states with different particle radius, every half-period. Using Brownian dynamics simulations, we show that the particle size oscillation, combined with the asymmetry of the channel, induces a drift along the channel axis, directed towards the steeper wall of the channel. The oscillation of the particle size is accompanied by a time variation of the space accessible to the particle and by an oscillation of its diffusion coefficient. The former underlies the drift inducing mechanism of purely entropic nature. The latter, combined with the former, leads to a significant amplification of the effect. The drift velocity vanishes when interconversion between the states occurs either very slow or very fast, having a maximum in between. The position and magnitude of the maximum are discussed by providing an analytical approach based on intuitively appealing assumptions. Published by AIP Publishing.
Zwitterionic polymer brush grafting on anodic aluminum oxide membranes by surface-initiated atom transfer radical polymerization
(2017-04-21)
Chu, Chien-Wei
;
Higaki, Yuji
;
Cheng, Chao-Hung
;
Cheng, Ming-Hsiang
;
Chang, Chun-Wei
A feasible processing of zwitterionic polymer-grafted anodic aluminum oxide (AAO) membranes by surface-initiated atom transfer radical polymerization (SI-ATRP) and the geometric effect on the polymer chain growth in the confined nanopores were investigated. A zwitterionic poly(3-(N-2-methacryloyloxyethyl-N,N-dimethyl)ammonatopropanesulfonate) (PMAPS) brush was produced on an AAO membrane via introduction of an initiator with a phosphonate group and subsequent SI-ATRP. The PMAPS-grafted AAO membranes were characterized by water droplet contact angle measurement, size exclusion chromatography (SEC), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), thermo-gravimetric analysis (TGA), and laser Raman micro-spectroscopy. The linear relationship between the grafting yield (Y) of the PMAPS brush and number-average molecular weight (M-n) of the unbound PMAPS indicates that there is no significant geometric effect on the chain growth under the spatial confinement inside the nanopores with diameters of similar to 200 nm. The PMAPS brushes were diminished near the center section along the nanopores because the monomer supply was retarded. The capability of the PMAPS-grafted AAO membranes for inorganic nanoparticle immobilization was also demonstrated using gold nanoparticles (AuNPs) through ion-exchange and reduction processes.
Synthesis and side-chain isomeric effect of 4,9-/5,10-dialkylated-beta-angular-shaped naphthodithiophenes-based donor-acceptor copolymers for polymer solar cells and field-effect transistors
(2017-04-21)
Chiou, De-Yang
;
Cao, Fong-Yi
;
Hsu, Jhih-Yang
;
Tsai, Che-En
;
Lai, Yu-Ying
A systematic methodology is developed to construct the angular-shaped beta-form naphthodithiophene (beta-aNDT) core with regiospecific substitution of two alkyl groups at its 4,9-or 5,10-positions via the base-induced double 6 pi-cyclization of dithienyldieneyne precursors, leading to the two isomeric 4,9-beta-aNDT and 5,10-beta-aNDT monomers. It is found that a more curved geometry of the beta-aNDT units intrinsically increases the solubility and thus the solution-processability of the resultant polymers. Therefore, beta-aNDT units are ideal for polymerization with an acceptor-containing monomer without the need for any solubilizing aliphatic side chains, which are considered the insulating portion that jeopardizes charge transport. Based on this consideration, the 4,9- and 5,10-dialkylated beta-aNDT monomers are polymerized with the non-alkylated DTFBT acceptor to afford two P4,9-beta NDTDTFBT and P5,10-beta NDTDTFBT copolymers for head-to-head comparison of the 4,9-inner/5,10-outer isomeric alkylation effect. It is found that 4,9-beta aNDT adopts a twisted conjugated structure due to the intramolecular steric repulsion between the inner branched side chains and the beta-hydrogens on the thiophene rings. The slightly twisted 4,9-beta-aNDT moiety allows P4,9-beta NDTDTFBT to have higher solubility upon polymerization and thus a higher molecular weight, which eventually induces a higher ordered packing structure in the thin film compared to P5,10-beta NDTDTFBT. As a result, P4,9-beta NDTDTFBT exhibits a higher OFET mobility of 0.18 cm(2) V-1 s(-1), and the P4,9-beta NDTDTFBT: PC71BM-based solar cell device also achieves a higher PCE of 7.23%, which is even better than the corresponding P4,9-alpha NDTDTFBT-based device.
實驗教育　另一個學習基地
(2017-04-23)
韓舒容
;
Department of Communication and Technology
;
傳播與科技學系
介紹什麼是實驗教育和目前實驗教育概況。
拒絕貪婪　阻止血腥盜獵
(2017-04-23)
張博倫
;
Department of Communication and Technology
;
傳播與科技學系
在世界的許多角落依然存在著盜獵，動物們面臨滅絕危機。
各國熱門遊戲與冷知識
(2017-04-23)
魏若芸
;
Department of Communication and Technology
;
傳播與科技學系
整理各國的熱門遊戲與有趣的冷知識。
3U生活圈
(2017-04-23)
曾婕茵
;
Department of Communication and Technology
;
傳播與科技學系
台北市政府於今年二月推動「3U」計畫，聯合其他縣市整合YouBike、U-Motor及U-Car等運具，以共享經濟創造3U生活圈。
遊戲類型知多少
(2017-04-23)
邱琨皓
;
Department of Communication and Technology
;
傳播與科技學系
線上遊戲的類型有很多，而最令人著迷的則有角色扮演、策略推塔以及競技射擊類型。
台灣女性時裝史　百年風尚
(2017-04-23)
陳昶安
;
Department of Communication and Technology
;
傳播與科技學系
本表以雜誌排版形式濃縮近一百年來台灣女性的服飾風格流變及軌跡。
無性無愛？遲緩兒與性犯罪
(2017-04-23)
范瑀真
;
Department of Communication and Technology
;
傳播與科技學系
直視驚悚推理劇「姜老師，你談過戀愛嗎？」當中，遲緩兒角色陳威政的性犯罪行為。
編織創意　獨立遊戲
(2017-04-23)
何肇耕
;
Department of Communication and Technology
;
傳播與科技學系
開發遊戲並不只是知名遊戲公司的專利，眾志成城的背後實際上有一大群人正奮力築著屬於自己的夢想之城。
室內儲煤倉著手空汙防制
(2017-04-23)
張芳語
;
Department of Communication and Technology
;
傳播與科技學系
簡述台電未來將建設的室內儲煤倉，可減少火力發電廠的儲煤飛入空氣。
我看醫學生
(2017-04-23)
陳奕璇
;
Department of Communication and Technology
;
傳播與科技學系
醫學生的心境旁人難以揣測，用人／物的旁觀角度一窺醫學生的生活。
擁抱靈魂的天使　張艾如
(2017-04-23)
林宥成
;
Department of Communication and Technology
;
傳播與科技學系
臨床心理師張艾如，用著屬於他的溫暖與理解，滋潤每個曾受過傷的靈魂。
台灣電商　行動新主流
(2017-04-23)
彭書耘
;
Department of Communication and Technology
;
傳播與科技學系
行動裝置購物掀起一波巨大革命，台灣在此浪潮的何處？
零安樂死　流浪動物雙面刃
(2017-04-23)
劉以寧
;
Department of Communication and Technology
;
傳播與科技學系
已實施將近二十個年頭的「動物保護法」的新法條正式生效，也就是俗稱的「流浪動物零安樂死政策」，使得臺灣成為全球第二個推動零撲殺措施的國家。
每天一萬步？冷知識大解析
(2017-04-23)
王廷瑄
;
Department of Communication and Technology
;
傳播與科技學系
每天要走一萬步的口號是怎麼來的？介紹關於走路的小知識與健教APP遊戲推薦。
推廣客家新音樂　獎勵比賽
(2017-04-23)
鄧涵文
;
Department of Communication and Technology
;
傳播與科技學系
為推廣客家流行音樂，客家委員會與地方客家事務局推動政策，並舉辦徵選，提供平台讓新生代創作人發揮，也讓更多人知道客家音樂不只有山歌。
行者　空緩美學的剛柔並濟
(2017-04-23)
凃湘羚
;
Department of Communication and Technology
;
傳播與科技學系
「行者」，記錄無垢舞蹈劇團編舞家林麗珍的創作歷程。
就是字　教育與設計並進
(2017-04-23)
何家沂
;
Department of Communication and Technology
;
傳播與科技學系
介紹造字團隊就是字的理念和字型產業的現況