RAN最新文献

{"title":"Photocatalytic Activity of Er-TiO2 Nanocomposite","authors":"E. Wyrzykowska, A. Mikołajczyk, Joanna Nadolna, T. Puzyn","doi":"10.11159/ICNMS17.106","DOIUrl":"https://doi.org/10.11159/ICNMS17.106","url":null,"abstract":"Extended Abstract One of the directions in the evolution of the environmental friendly technologies is developing efficient methods of contaminant disposal. Particularly, researchers pay attention to the semiconductor-based heterogeneous photocatalysis that plays a crucial role in degradation of impurities in the presence of TiO2 nanomaterials. At present, the methods based on photodegradation are widely used during purifications of water streams and wastewater, as well as to remove volatile substances from the atmosphere. This approach uses commonly available resources of solar radiation and simultaneously does not require additional chemicals during purification, what is a huge advantage over any other conventional methods. The photocatalytic property of TiO2 is closely related with the band gap energy. When the semiconductor (TiO2) is exposure on the solar radiation, the photon hv with the energy equal or greater than the band gap of TiO2 (~3.2 eV) creates electron-hole pair – the valence electron is excited and promoted to conduction band, while the positive hole is formed on the valence band. This metastable state can be recombine and release the energy as a heat or in reaction with surrounding electron donors/acceptors (causing their degradation at the same time) or as a result of interactions with the surrounding double layer of the particle. The minimum energy to performed electron–hole pair (~3.2 eV) corresponds to the photon energy at a wavelength of λ>388 nm, what is 3-5% of solar radiation. The main drawback of application of TiO2 NPs as environmentally benign treatment technology for a variety of pollutants is that it can only be excited by ultraviolet light. Thus, an extension of its absorption wavelength range to the visible region (vis) is desirable to use the main part of solar spectrum. One of the most promising approach for extension of the spectral sensitivity is to influence electronic properties of TiO2 by some structure modifications. In this way, it is possible to get an efficient photocatalyst activated of UV, Vis and NIR radiation. Reactivity of TiO2 in visible light (λ> 400 nm) can be achieved by: (i) transition metal ions doping (e.g. Cr, Mn, Mo, Nb, V, Fe, Ru, Au), (ii) non-metals doping (e.g. N, S, B, F, I), (iii) reduced form of TiO2-x, or (iv) doping with semiconductors, which have lower band gap energy. Recently, researchers provide potentials for TiO2 photocatalysts modified lanthanides, for example holmium atom [1]. The modified titanium dioxide nanomaterial can form the basis for the new generation semiconductor. The aim of the project is to develop the TiO2-based semiconductor having photocatalytic activity under visible (λ>380 nm) and NIR (λ>780 nm) radiation. This study has demonstrated application of the plane-wave-based Vienna ab-initio simulation package (VASP) to obtain predictive knowledge on structural features of RE-TiO2 nanoparticles (RE rare earth metal) that may govern their photocatalytic activity","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88430719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Redox Property of Cu-Fe Based Oxygen Carriers Promoted with MnO2","authors":"Yong Han Jeong, N. Park, T. Lee, S. Ryu, Misook Kang, J. Baek, H. Ryu","doi":"10.11159/ICNNFC17.113","DOIUrl":"https://doi.org/10.11159/ICNNFC17.113","url":null,"abstract":"Yong Han Jeong, No-Kuk Park, Tae Jin Lee, Si Ok Ryu, Misook Kang, Jeom-In Baek, Ho-Jung Ryu School of Chemical Engineering, Yeungnam University 280, Daehak-Ro, Gyeongsan, Korea madmovie0@gmail.com; nokukpark@ynu.ac.kr; soryu@ynu.ac.kr; tjlee@ynu.ac.kr School of Chemistry, Yeungnam University mskang@ynu.ac.kr Korea Electric Power Research Institute 105, Munji-Ro, Yuseong-Gu, Daejeon, Korea jibaek@kepco.co.kr Korea Institute Energy Research 152, Gajeong-Ro, Yuseong-Gu, Daejeon, Korea hjryu@kier.re.kr","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86778609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inorganic Ligand-Capped Colloidal Nanocrystals for Electronic Device Application","authors":"Jaeyoung Jang","doi":"10.11159/icnnfc17.135","DOIUrl":"https://doi.org/10.11159/icnnfc17.135","url":null,"abstract":"Extended Abstract Colloidal nanocrystals can combine the advantages of crystalline inorganic semiconductors with the size-tunable electronic structure and inexpensive solution-based device fabrication.[1] They are of great interest due to these unique advantages for use in electronic and optoelectronic devices such as field-effect transistors (FETs), photovoltaic cells, and light-emitting diodes.[1-8] Efficient charge transport is crucial for high performance of nanocrystal-based electronic and optoelectronic devices.[2,3] Many practical implementations of nanocrystals are hindered by the poor electronic coupling in close-packed nanocrystal films, caused by the presence of bulky organic surface ligands. In this study, to address this fundamental problem, various types of inorganic surface ligands are introduced.[2,4,5] By using optimized inorganic surface ligands, nanocrystal solids are prepared exhibiting band-like charge transport, high photoconductivity and tunable doping level.[6] For example, we explore the temperature-dependent Hall effect of inorganically capped InAs nanocrystals. In addition, a solution-based “soldering” process is introduced to fabricate ultrahigh electron mobility (>300 cm 2 /Vs) nanocrystal solids using colloidal nanocrystals with molecular “solders”.[7,8] The high-mobility FETs were fabrcated by spin-coating a solution of Cd2Se3 2-capped CdSe nanocrystals, followed by thermal annealing. Finally, we expand the application of the NC soldering process to core−shell NCs consisting of a III−V InAs core and a CdSe shell with composition-matched Cd2Se3 2− molecular solders. Soldering CdSe shells forms nanoheterostructured material that combines high electron mobility and near-IR photoresponse.","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78412104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Fabrication Process for Nanopatterns Shrinkage with Variable Sizes for Large Area","authors":"S. Si, Lars Dittrich, M. Hoffmann","doi":"10.11159/ICNNFC17.129","DOIUrl":"https://doi.org/10.11159/ICNNFC17.129","url":null,"abstract":"In this paper, a cost efficient process chain is designed to shrink periodic nanopatterns to tunable feature sizes. The feature size of the final patterns can be controlled and adjusted. 100 mm full wafers featuring square holes with 130 nm, 160 nm, 190 nm and 220 nm feature sizes are fabricated from the original wafer containing circular holes with a diameter of 350 nm. The fabrication chain involves well-known technologies such as etching and soft UV nanoimprint lithography (UV-NIL). Based on a single original master, an intermediate template is fabricated featuring an inversed pyramid pattern using soft UV-NIL and subsequent wet chemical etch. By utilizing the slope of the inversed pyramid structures, the mask on the final substrate can be opened featuring tunable dimensions. Cryogenic etching based on SF6/O2 chemistry enables the creation of the final shrunk nanopatterns with smooth and vertical profile. The fabrication cycles involve only short imprinting and etch processes coping without costly electron beam writings. Therefore, the original microand nanostructure wafer can be shrunk into nanopatterns with tunable feature sizes at a constant pitch in a cost effective manner. The generated periodic nanopatterns can be adopted to the fields of NIL templates, photonic crystals, optics, energy conversion and","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82147324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interference of Silver Nanoparticles with Tumor Necrosis Factor Action in Epithelial Cells","authors":"Grądzka Iwona, Sikorska Katarzyna, Brzóska Kamil","doi":"10.11159/icnb17.116","DOIUrl":"https://doi.org/10.11159/icnb17.116","url":null,"abstract":"Extended Abstract Silver nanoparticles (AgNPs), due to their antibacterial properties are widely used as additives to textiles, cosmetics, food packaging, surgical instruments or wound dressings. Being present in so many consumer goods, AgNPs are able to penetrate the human body via multiple paths [1]. The formation of reactive oxygen species (ROS) is believed to be the main mechanism of AgNPs action in a cell. ROS can launch both pro-survival and death signaling pathways depending on the level of oxidative stress induced [2]. Recently, we showed that AgNPs are able to activate NF-κB signaling pathway and expression of genes related to inflammatory and stress response [3]. Similar program is activated by tumor necrosis factor (TNF) – a major pro-inflammatory cytokine [4]. Our objective was to assess the possible interference of AgNPs (20 nm, BSA coated) with cellular response to TNF in two human cell lines: A549 lung adenocarcinoma and HepG2 liver hepatocellular carcinoma. Both types of cells absorbed AgNPs added to the medium as shown cytometrically by using side-scattered light. During 24-hour incubation, the effect of TNF and AgNPs on growth retardation and the incidence of cell death was additive and HepG2 cells were more sensitive to the agents studied. Analysis of the cell cycle discovered G1 arrest after TNF and S and G2/M arrest under AgNPs influence in both cell lines, whereas the combined treatment resulted in G1 and S accumulation in A549 and G2/M accumulation in HepG2 cells. Over a longer incubation period (7-12 days), in the clonogenicity test, the effect of TNF and AgNPs on the cell survival was synergistic. The effect of the selected signaling pathways inhibitors was tested using neutral red viability 24-hour assay. Surprisingly, the use of IKK II and IKK VII the inhi pathway – led to the increase of the cell viability in both cell lines treated with TNF, AgNPs or both agents simultaneously. Apart from end cellular effects, the expression of genes involved in the anti-oxidative defense and inflammatory response was analyzed by using real-time PCR. It was shown that the expression of heme oxygenase 1 (HMOX1), the protein induced by oxidative stress, was greatly enhanced in TNF and AgNPs treated cells compared to that observed after TNF alone. Similarly, AgNPs augmented the expression of pro-inflammatory cytokines CSF3 and IL-10. On the contrary, the expression of toll-like receptors TLR3 and TLR7, important for virus pathogen recognition, was significantly hampered by the addition of AgNPs. The presented results indicate that AgNPs change the final cellular result of TNF action and disrupt the cellular homeostasis, that can contribute to the development of malignancy or autoimmune diseases at the level of the organism. Therefore, an extended study is needed to provide more information about the nature and specificity of the functional interactions between TNF and AgNPs in cells. This work was supported by the grant 2014/13/D/NZ7/002","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80516638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical Cell Disruption Using Hierarchical Micro-Nano Structures on Nanoporous Alumina Filter","authors":"Yong Hun Lee, E. Han, Y. Park, B. Kim, Y. Seo","doi":"10.11159/ICNNFC17.111","DOIUrl":"https://doi.org/10.11159/ICNNFC17.111","url":null,"abstract":"Extended Abstract Cell disruption is essential process in molecular biology and biomedical engineering for investigation of DNA, RNA, virus and protein in cell. Generally, there are some methods for cell disruption or cell lysis such as chemical, electrical and mechanical method. [1, 2] Chemical cell lysis is method that dissolve cell envelope and nucleus using cell lysis buffer and lysate from this process contains lysis buffer which couldn’t know the composition. Electrical and mechanical cell disruption methods required external equipment and shows low cell disruption efficiency. Especially, mechanical cell disruption is easy and quick method and studied using microstructures for increment of cell disruption efficiency. [3, 4] However, most of microstructures such as microchannel or microblade has critical dimension around 3μm and cell could through-out by deformation of its body. [5, 6] In this study, we presents the mechanical cell disruption using hierarchical micro-nano structures on nanoporous alumina filter. Hierarchical micro-nano structures on nanoporous alumina filter was fabricated aluminium wet etching process and multi-step anodic aluminium oxidation process. Pure aluminium sheet (5N, 1mm thickness) was mechanical and electro-polished for mirror-like surface. Next, aluminium sheet was dipped in aluminium etchant of CuCl2 base for fabrication of micro-structures. During aluminium etching process, micro-structures were formed by chipping off a grain boundary of aluminium. Multi-step anodic aluminium oxidation process was carried out for fabrication of nano-structures and filter body. Aluminium that formed micro-structures on surface was anodized twice in 0.3M phosphoric acid aqueous solution of -5°C under 180V. Formed nanoporous alumina structure was expanded by wet etching process for forming of spike-like nanostructure shape in 0.1M phosphoric acid aqueous solution of 35°C. 3 rd anodic aluminium oxidation process was carried out for fabrication of filter body under same condition mentioned above for 40hours. Finally, aluminium was removed and barrier layer of nanoporous alumina was opened by wet etching process. For mechanical cell disruption, NIH3T3 fibroblast cells (1 ×10 6 cells/ml) in PBS (phosphate buffered saline) were injected through hierarchical micro-nano structures on nanoporous alumina filter which assembled with commercial filter holder by air pressure (5bar). Cell disruption efficiency was evaluated by quantification of DNA and protein in lysate. Concentration of DNA and protein were quantified using DNA isolation kit (DNeasy, Quiagen) and Bradford assay, respectively. According to results, 5.1 ± 1.3 μg/ml of DNA and 46 ± 11 μg/ml of protein were detected from lysate. In cell disruption process using hierarchical micro-nano structure on nanoporous alumina filter, cell envelope and nucleus were teared by micro-structures and un-teared nucleus by micro-structure was disrupted by nano-structures. This results shows cell ","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80585860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cu(II)-Imprinted Nanoparticles for Real Time Detection of Cu(II) Ions","authors":"M. Andaç, Nihan Aydoğan, Monireh Bakhshpour, A. Denizli","doi":"10.11159/ICNEI17.106","DOIUrl":"https://doi.org/10.11159/ICNEI17.106","url":null,"abstract":"","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73374612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Theoretical-Experimental Comparison of CdSe Quantum Dot Optical Properties","authors":"I. Oliva, Sandra Alvarenga, C. Rudamas","doi":"10.11159/ICNMS17.105","DOIUrl":"https://doi.org/10.11159/ICNMS17.105","url":null,"abstract":"In this work, we have studied the optical properties of CdSe quantum dots (QDs) with different sizes. Using the SIESTA code and the Kramers-Kronig relations, we have computed the imaginary part of the dielectric constant and the density of states (DOS). The absorption spectra are compared to experimental results from samples fabricated using the thermal decomposition method and a good agreement was obtained. The experimental band edge absorption could be associated to a specific optical transition in our QDs. A well defined second absorption band has been observed in our theoretical results. The energy maximum of these bands follow the expected quantum size effect. However, we do not observed the increase of the energy difference between them, reported by other authors. The reducing of absorption band intensity when the quantum dot size increases, has been seen. Preliminary density of states calculations, also reported in this work, allowed the association of Cdor Se-character to the energy states in our samples.","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72537383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth of ZnO Nanorod Film on Glass Substrate by Nitric Acid Assisted Aqueous Solution Deposition","authors":"Ming-kwei Lee, Mu Wang, Hao Wang, Chang-Chin Tsai, Cheng-Yu Kung, Chiamin Yang, Huan-Chi Lung","doi":"10.11159/ICNNFC17.121","DOIUrl":"https://doi.org/10.11159/ICNNFC17.121","url":null,"abstract":"In this paper, the growth of ZnO nanorod film transformed from ZnO nanorod array on glass substrate was investigated. ZnO seed layer was first prepared on substrate by RF sputtering. Zinc nitrate and hexamethylenetetramine were used as precursors for the growth of ZnO nanorod array on glass substrate at 50 o C. The aqueous solution was assisted with the incorporation of nitric acid to increase the growth rate and the grain size of ZnO nanorod. With the growth time, ZnO nanorod film is gradually transformed from ZnO nanorod array.","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90192658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polyamide Nanofiber Composites for Organic Pollutant Removal and Chemical Warfare Protection","authors":"Junho Chung, Daeyeon Won, Junhyung Lee, Changkyun Kim, S. Kwak","doi":"10.11159/ICNEI17.109","DOIUrl":"https://doi.org/10.11159/ICNEI17.109","url":null,"abstract":"Extended Abstract Polymer nanofiber composites for the treatment of hazardous compounds are of considerable scientific and technological interest. In this study, polyamide nanofiber for organic pollutant removal and chemical warfare protection is discussed. The effect of position of functional materials in nanofiber matrix on the photocatalytic activity was studied by comparing the Ag-TiO2-decorated nylon nanofiber composite (AT-sur-NF) and Ag-TiO2-embedded nylon nanofiber composite (AT-in-NF) [1]. We find that AT-sur-NF shows better photocatalytic activity compared to the photocatalytic activity of AT-in-NF. Based on these results, nylon and meta-aramid nanofibers decorated by various functional nanomaterials were fabricated. The electrospun meta-aramid nanofiber composites exhibit poor chemical stability because of the salt molecules remaining between meta-aramid chains [2]. The chemical stability of meta-aramid nanofiber composites were improved by removing salt molecules during washing and additional thermal treatment. The polyamide nanofiber composites were stacked to enhance mechanical properties and resistivity to chemical warfare agents (CWAs). By controlling the stacking of polyamide nanofiber composites, thickness, weight density, and cool/warm feeling are optimized. In addition, the assemblies exhibit enough resistivity to CWAs while still maintain water vapor transmission to allow evaporation of sweat on the skin. Further study on the thermal properties and microstructure of nylon nanofibers reveals that the chains rigidity and thermal stability increase with decreasing diameter of nylon nanofibers.","PeriodicalId":31009,"journal":{"name":"RAN","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89921339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}