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Encapsulation of Curcumin Loaded Oil Droplets By Cryotropic Gel Formation from O/W Emulsion

Procedia Food science 2011年 1卷 1973-1979页

作者： Kyuya Nakagawa Nataporn Sowasod Tawatchai Charinpanitkul Apinan Soottitantawat Wiwut Tanthapanichakoon Research Centre for Nano-Micro Science and Engineering University of Hyogo 2167 Shosha Himeji 671-2280 Japan Nanoscience and Technology Program Graduate School Chulalongkorn University Patumwan Bangkok 10330 Thailand Center of Excellence in Particle Technology Chulalongkorn University Patumwan Bangkok 10330 Thailand

Cryogel based encapsulation was attempted to entrap oil phase (containing curcumin) with a ternary system of colloidal chitosan, κ-carrageenan, and carboxy methylcellulose sodium salt (NaCMC). The cryotropic gel formation was investigated by varying the cooling rate during freezing and type of polymer suspension. The microstructure of the resulting curcumin cryogels revealed oil droplets entrapped in the cryogel matrix. The encapsulation yield for two types of suspension was found to vary from 83.89 to 99.37%. Controlled release of the curcumin in an aqueous system could be maintained for 4 days, and the released amount of curcumin was found to vary from 41.1-59.9%. The encapsulation yield as well as the released pattern and amount of curcumin were influenced by the cooling protocol used during freezing. The release patterns were found to be sensitive to the ambient aqueous pH and, interestingly, either a burst release or a first order release was achievable simply by changing the freezing condition. These results suggested that freezing could modify the gel formation of the present cryogel, and the resulting structural modification evidently controlled the oil encapsulation manner. The present ternary system (chitosan, κ- carrageenan, and NaCMC) is an interesting matrix for designing controlled release system in a food system.

关键词： cryogel curcumin chitosan carrageenan carboxymethylcellulose freezing

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Quantum Dots: Ultrasensitive, Biocompatible, Quantum‐Dot‐Embedded Silica nanoparticles for Bioimaging (Adv. Funct. Mater. 9/2012)

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Advanced Functional Materials 2012年第9期22卷

作者： Bong‐Hyun Jun Do Won Hwang Heung Su Jung Jaeho Jang Hyunsoo Kim Homan Kang Taegyu Kang San Kyeong Hyeokjae Lee Dae Hong Jeong Keon Wook Kang Hyewon Youn Dong Soo Lee Yoon‐Sik Lee School of Chemical and Biological Engineering Seoul National University Seoul 151‐747 Korea Department of Nuclear Medicine Seoul National University College of Medicine Seoul 110‐744 Korea Institute of Radiation Medicine Medical Research Center Seoul 110‐744 Korea Nanosquare Inc. ENG BLD39‐122 Seoul National University Seoul 151‐747 Korea WCU Department of Molecular Medicine and Biopharmaceutical Sciences Graduate School of Convergence Science and Technology Seoul National University Seoul 151‐747 Korea Nano Systems Institute and Interdisciplinary Program in Nano‐Science and Technology Seoul National University Seoul 151‐747 Korea Department of Chemistry Education Seoul National University Seoul 151‐747 Korea Cancer Imaging Center Seoul National University Cancer Hospital Cancer Research Institute Seoul National University College of Medicine Seoul 110‐799 Korea

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Dynamics and stability of divacancy defects in graphene

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Physical Review B 2011年第7期84卷 075445-075445页

作者： Youngkuk Kim Jisoon Ihm Euijoon Yoon Gun-Do Lee Department of Physics and Astronomy Seoul National University Seoul 151-747 Republic of Korea Department of Materials Science and Engineering Seoul National University Seoul 151-742 Republic of Korea Department of Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon 433-270 Republic of Korea Department of Materials Science and Engineering WCU Hybrid Materials Program Seoul National University Seoul 151-742 Republic of Korea Energy Semiconductor Research Center Advanced Institutes of Convergence Technology Seoul National University Suwon 443-270 Korea

A divacancy (DV) is one of the most abundant and most important defects in irradiated graphene, which modifies electronic and chemical properties of graphene. In this paper, we present ab initio calculations to study the dynamics and stability of DVs in graphene. Divacancies in graphene have various reconstructed structures, such as triple pentagon-triple heptagon (555-777) and pentagon-octagon-pentagon (5-8-5) patterns. A direct observation of the structural transformations between these reconstructions was recorded in transmission electron microscope images reported by Girit et al. in science 323, 1705 (2009). We clarify the atomic structures of DVs observed in the experiment and investigate the atomic processes and energetics for the observed dynamical motions in great detail. It is found that a series of Stone–Wales-type transformations are responsible for the migration and structural transformations of DVs and that a pentagon-heptagon-heptagon-pentagon (5-7-7-5) defect appearing as an intermediate structure during the dynamical process plays an important role in the transformations of DVs.

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nanotube- and nanorod-Based Dye-Sensitized Solar Cells

Green Energy and Technology

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Green Energy and technology 2011年 33卷 317-350页

作者： Sung, Yung-Eun Kang, Soon Hyung Kim, Jae-Yup School of Chemical Biological Engineering Seoul National University Seoul 151-744 Korea Republic of Department of Chemistry Education Chonnam National University Gwangju 500-757 Korea Republic of School of chemical and Biological Eng. and Interdisciplinary Program in Nano Science and Technology Seoul National University Seoul 151-742 Korea Republic of

ISBN: (纸本)9780857296375

Considerable efforts have been devoted to the design and synthesis of low-dimensional, nanostructured materials due to their morphology-dependent performances. In particular, one-dimensional (1-D) TiO2 nanostructures, including nanorods (NRs), nanowires (NWs), and nanotubes (NTs), have attracted considerable interest due to their unique characteristics. In dye-sensitized solar cell (DSSC) operation, 1-D nanostructure-based photoanodes can contribute to rapid electron transport, ensuring efficient charge collection by the conducting substrate in competition with recombination. Relying on the ordering of 1-D TiO2 nanomaterial, the conversion efficiency of DSSCs was affected because electron collection is determined by trapping/detrapping events at the site of the electron traps, such as defects, surface states, grain boundaries, and self-trapping. This point has promoted research on self-ordered, 1-D photoanodes stretched on a substrate with enhanced electron transport properties due to their desirable features: highly decreased intercrystalline contacts and a structure with a specified directionality. In this literature review, the preparation of various 1-D nanomaterials from disordered to ordered states and their electron dynamics in the application of DSSCs are reviewed.

关键词： Dye-sensitized solar cells

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In Vitro and In Vivo Uncaging and Bioluminescence Imaging by Using Photocaged Upconversion nanoparticles†

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Angewandte Chemie 2012年第13期124卷

作者： Yanmei Yang Qing Shao Renren Deng Chao Wang Xue Teng Kai Cheng Zhen Cheng Ling Huang Zhuang Liu Xiaogang Liu Bengang Xing Division of Chemistry and Biological Chemistry School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 (Singapore) Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 (Singapore) Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Institute of Functional Nano & Soft Materials Soochow University (P. R. China) Division of Biomedical Engineering School of Chemical and Biomedical Engineering Nanyang Technological University (Singapore) Molecular Imaging Program at Stanford (MIPS) Department of Radiology Stanford University Medical Center (USA) Institute of Materials Research and Engineering Agency for Science Technology and Research (A*STAR) 3 Research Link Singapore 117602 (Singapore)

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Innenrücktitelbild: In Vitro and In Vivo Uncaging and Bioluminescence Imaging by Using Photocaged Upconversion nanoparticles (Angew. Chem. 13/2012)

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Angewandte Chemie 2012年第13期124卷

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Inside Back Cover: In Vitro and In Vivo Uncaging and Bioluminescence Imaging by Using Photocaged Upconversion nanoparticles (Angew. Chem. Int. Ed. 13/2012)

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Angewandte Chemie International Edition 2012年第13期51卷

作者： Yanmei Yang Qing Shao Renren Deng Chao Wang Xue Teng Kai Cheng Prof. Zhen Cheng Prof. Ling Huang Prof. Zhuang Liu Prof. Xiaogang Liu Prof. Bengang Xing Division of Chemistry and Biological Chemistry School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 (Singapore) Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 (Singapore) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials Soochow University (P. R. China) Division of Biomedical Engineering School of Chemical and Biomedical Engineering Nanyang Technological University (Singapore) Molecular Imaging Program at Stanford (MIPS) Department of Radiology Stanford University Medical Center (USA) Institute of Materials Research and Engineering Agency for Science Technology and Research (A*STAR) 3 Research Link Singapore 117602 (Singapore) Xiaogang Liu Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 (Singapore) Bengang Xing Division of Chemistry and Biological Chemistry School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 (Singapore)

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Sugar coated stealth carbon nanotubes

Sugar coated stealth carbon nanotubes

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4th IEEE International Conference on nano/Molecular Medicine and Engineering, IEEE nanoMED 2010

作者： Kotagiri, Nalinikanth Kim, Jin-Woo Bio/Nano Technology Laboratory Cell and Molecular Biology Graduate Program University of Arkansas Fayetteville AR United States Bio/Nano Technology Laboratory Institute for Nanoscale Materials Science and Engineering University of Arkansas Fayetteville AR United States

ISBN: (纸本)9781612841533

Single walled carbon nanotubes (SWNT) have shown tremendous promise as agents for diagnostic and therapeutic intervention in vivo. We demonstrate how Dextran sulfate (DS) can render SWNT transparent to macrophages, a vital component of the innate immunity. We also demonstrate a site specific attachment strategy to conjugate antibodies to DS for downstream applications. DS was compared to Polyethylene Glycol (PEG) coated SWNT, a trusted standard for rendering nanoparticles immune to opsonization. © 2010 IEEE.

关键词： Polyethylene glycols

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Synthesis and high lithium electroactivity of rutile TiO2@C nanorods

Synthesis and high lithium electroactivity of rutile TiO2@C ...

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IEEE International nanoelectronics Conference (INEC)

作者： Yongcai Qiu Wei Chen Shihe Yang Nano Science and Technology Program Department of Chemistry Hong Kong University of Science and Technology Hong Kong China

Rutile TiO 2 nanorods were synthesized by surfactant assisted thermal hydrolysis of TiCl 4 in an acidic solution. A uniform thin layer of carbon coating on the TiO 2 nanorods was formed by in-situ reduction of carbon precursor molecules. The resulting TiO 2 @C nanorods were subjected to electrochemical measurements for testing their lithium electroactivity. The TiO 2 @C nanorods show a reversible capacity of ~220 mA h g -1 at C/5 and ~185 mA h g -1 at 1C, which are much better than those with bare TiO 2 nanorods and commercial P25 nanoparticles measured under the same conditions. The significantly enhanced reversible capacity and rate capability evinces the dramatic increase of the average electron conductivity and structural stability of the anode composite material due to the thin carbon coating layer.

关键词： Lithium Coatings Testing nanoparticles Electrons Conductivity Structural engineering Anodes Composite materials nanocomposites

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Distance-dependent variation with the length of dna spacers in fluorescence signals of DNA-CY3-tailored gold nanoparticles deposited on a solid surface

Distance-dependent variation with the length of dna spacers ...

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14th International Conference on Miniaturized Systems for Chemistry and Life sciences 2010, MicroTAS 2010

作者： Obliosca, Judy M. Wang, Pen-Cheng Tseng, Fan-Gang Department of Engineering and System Science National Tsing Hua University Hsinchu 30013 Taiwan Nano Science and Technology Taiwan International Graduate Program Institute of Physics Academia Sinica 128 Academia Rd. Nankang Taipei 115 Taiwan

ISBN: (纸本)9781618390622

We report the distance-dependent fluorescence behavior of Au-DNA conjugates prepared by equilibrating the phos-phine-stabilized gold nanoparticles (AuNPs) of 10-nm size with the designed rigid spacer double-stranded DNA consisting of thiol-modified target and Cy3-labelled complementary probe of different lengths (5 to 20 nm). The products were immobilized onto a MPTMS (3- mercaptopropyltrimethoxysilane)-modified glass substrate and were finally excited with a 532-nm laser source. Fluorescence quenching in both solution and solid platforms was assessed via disulfide bond cleavage between Au and DNA-Cy3 using mercaptoethanol. Successful and effective cleavage revealed by UV-vis absorption and fluorescence profiles was achieved in just only a few minutes.

关键词： Gold nanoparticles

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