Relevant bibliographies by topics / Nano-Ag

Academic literature on the topic 'Nano-Ag'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Nano-Ag"

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Guo, Chao, Xin Xin Li, and Yin Sheng Dong. "Preparation and Characterization of Silver/Hydroxyapatite Nanoparticles." Advanced Materials Research 311-313 (August 2011): 1746–50. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1746.

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Aggregation problem limits the use of silver nanoparticles (nano-Ag). Liquid chemical reduction method was used to fabricate silver/hydroxyapatite nanoparticles (nano-Ag/HA) by depositing nano-Ag on the surface of hydroxyapatite nanoparticles (nano-HA). The XRD result shows nano-Ag/HA is a hybrid composite of hydroxyapatite and face-centered cubic crystalline silver. The TEM result confirms the size and distribution of nano-Ag are dependent on the mass ratio of deposited nano-Ag and nano-HA, decreasing the mass ratio can obtain nano-Ag with smaller size and less particle aggregation, which can be contributed to the heterogeneous nucleation effect of nano-HA on nano-Ag. Silver/hydroxyapatite/alginate composite dressing was fabricated by spraying nano-Ag/HA onto the surface of the alginate dressing. The test result of disc diffusion method shows the evident antimicrobial activity against Escherichia coli (E. coli) is assigned to nano-Ag/HA, no significant difference can be found between the dressings with 0.01g and 0.02g nano-Ag.
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Nhu, Vo Thi Thu, Nguyen Ngoc Duy, Huynh Nguyen Anh Tuan, Nguyen Pham Tu Ngan, Do Quang Minh, and Nguyen Quoc Hien. "PHOTOCATALYTIC DEGRADATION OF RHODAMINE B USING Ag NANO DOPED TiO2 PREPARED BY -IRRADIATION METHOD." Vietnam Journal of Science and Technology 54, no. 4 (August 18, 2016): 494. http://dx.doi.org/10.15625/0866-708x/54/4/7201.

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Ag nano deposited on TiO2 (Degussa P25) (Ag nano/TiO2) photo-catalyst has been synthesized by g-irradiation method. The characteristics of Ag nano/TiO2 material has been investigated by BET surface area, X-ray diffraction (XRD), transmission electron microscopy (TEM) and the diffuse reflectance spectra (DRS). The photo-catalytic properties of Ag nano/TiO2 for degradation of Rhodamine B in aqueous solution under visible light have been studied. Results indicated that Ag nano/TiO2 photo-catalyst exhibited better photo-catalytic activity compared to that of TiO2 under the same reaction condition. The higher activity of Ag nano/TiO2 is due the enhancement of electron–hole separation effect on the surface of the catalyst. At 1.5% Ag doping content, the Ag nano/ TiO2 photo-catalyst exhibited the highest photo-catalytic activity under visible light.
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Ding, Zikun, Zhichao Wang, Bowen Zhang, Guo-Quan Lu, and Yun-Hui Mei. "A Reliable Way to Improve Electrochemical Migration (ECM) Resistance of Nanosilver Paste as a Bonding Material." Applied Sciences 12, no. 9 (May 9, 2022): 4748. http://dx.doi.org/10.3390/app12094748.

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Electrochemical migration (ECM) of sintered nano-Ag could be a serious reliability concern for power devices with high-density packaging. An anti-ECM nano-Ag-SiOx paste was proposed by doping 0.1wt% SiOx nanoparticles rather than previously used expensive noble metals, e.g., palladium. The ECM lifetime of the sintered nano-Ag-SiOx was 1.5 to 3 times longer than that of the sintered nano-Ag, due to the fact that the SiOx could protect the Ag from oxidation. The thermo-mechanical reliability of the sintered nano-Ag-SiOx was also improved by sintering under 5 MPa assisted pressure. The lesser porosity and smaller grain boundaries of the sintered nano-Ag-SiOx could also be beneficial to retard the silver ECM. In the end, a double-sided semiconductor device was demonstrated to validate the better resistance to the ECM using the sintered nano-Ag-SiOx.
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Nguyen Thi, Kim Lan, Ngoc Duy Nguyen, Thanh Long Vo, Thai Hoang Nguyen, Thu Nhu Vo Thi, and Quoc Hien Nguyen. "Synthesis of Ag nano/TiO₂ material by gamma Co-60 ray irradiation method for dye-sensitized solar cell application." Nuclear Science and Technology 6, no. 1 (September 24, 2021): 37–42. http://dx.doi.org/10.53747/jnst.v6i1.144.

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Silver nano deposited on TiO2 nano (Ag nano/TiO2) materials with different initial Ag+ content (0.1-0.75%, w/w) were synthesized by Co-60 gamma irradiation and used as photoanode of dye-sensitized solar cells. The characteristics of Ag nano/TiO2 were determined by X-ray diffraction (XRD), transmission electron microscope (TEM) and UV-visible spectroscopy (UV-Vis). Bandgap energy values of Ag nano/TiO2 materials were also determined. Ag nano/TiO2 has improved efficiency of solar-to-electrical energy conversion of solar cells. The efficiency of solar cell assembled with Ag nano 0.75%/TiO2 was of 4.71% which increased about 25.6% compared with that of the cell based on TiO2 (3.75%). Preparation of Ag nano/TiO2 material by gamma irradiation is promising method that may be applied on large scale for production of dye-sensitized solar cells and for other applications as well.
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Dong, Zihao, Ran Li, and Yan Gong. "Antibacterial and Freshness-Preserving Mechanisms of Chitosan-Nano-TiO2-Nano-Ag Composite Materials." Coatings 11, no. 8 (July 30, 2021): 914. http://dx.doi.org/10.3390/coatings11080914.

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With chitosan, nano-TiO2 and nano-Ag as raw materials, nano-TiO2 and nano-TiO2-Ag were modified by a surface modifier-sodium laurate. Chitosan (CTS), chitosan-nano-TiO2 (CTS-TiO2), and chitosan-nano-TiO2-nano-Ag (CTS-TiO2-Ag) composite materials and corresponding films were prepared by a solution co-blending method. Then, the antibacterial performances of the above three types of materials against Escherichia coli, Staphylococcus aureus, and Bacillus subtilis were compared. Moreover, potato and strawberry weight loss rates, peroxidase activity, and vitamin C contents after different film coating treatments were measured. Compared with CTS films, the CTS-TiO2-Ag and CTS-TiO2 composite films both showed better physical properties, and both demonstrated higher antibacterial effects, especially for E. coli. Measurement of physiological indices in fruits and vegetables showed that the freshness-preserving effect of CTS-TiO2-Ag coating films was the most significant. In all, the CTS-TiO2-Ag coating films can actively contribute to the storage of fruits and vegetables at room temperature, and better ensure product quality. Thus, such films are meaningful for research and development of new fruit freshness-keeping techniques and materials.
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Khachatryan, Gohar, Karen Khachatryan, Jacek Grzyb, and Maciej Fiedorowicz. "Formation and properties of hyaluronan/nano Ag and hyaluronan-lecithin/nano Ag films." Carbohydrate Polymers 151 (October 2016): 452–57. http://dx.doi.org/10.1016/j.carbpol.2016.05.104.

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Kitchin, Kirk T., Judy A. Richards, Brian L. Robinette, Kathleen A. Wallace, Najwa H. Coates, Benjamin T. Castellon, Eric A. Grulke, Jiahui Kou, and Rajender S. Varma. "Biochemical Effects of Silver Nanomaterials in Human Hepatocellular Carcinoma (HepG2) Cells." Journal of Nanoscience and Nanotechnology 20, no. 9 (September 1, 2020): 5833–58. http://dx.doi.org/10.1166/jnn.2020.17858.

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In dose–response and structure–activity studies, human hepatic HepG2 cells were exposed to between 0.01 and 300 ug/ml of different silver nanomaterials and AgNO3 for 3 days. Treatment chemicals included a custom synthesized rod shaped nano Ag, a glutathione capped nano Ag, polyvinylpyrrolidone (PVP) capped nano Ag (75 nm) from Nanocomposix and AgNO3. Various biochemical parameters were then evaluated to study cytotoxicity, cell growth, hepatic function and oxidative stress. Few indications of cytotoxicity were observed between 0.1 ug/ml and 6 ug/ml of any nano Ag. At 10 ug/ml and above, Ag containing nanomaterials caused a moderate to severe degree of cytotoxicity in HepG2 cells. Lactate dehydrogenase and aspartate transaminase activity alterations were the most sensitive cytotoxicity parameters. Some biochemical parameters were altered by exposures to both nano Ag and AgNO3 (statistically significant increases in alkaline phosphatase, gamma glutamyltranspeptidase, glutathione peroxidase and triglycerides; in contrast both glutathione reductase and HepG2 protein concentration were both decreased). Three parameters were significantly altered by nano Ag but not by AgNO3 (decreases in glucose 6-phosphate dehydrogenase and thioredoxin reductase and increases in catalase). Cytotoxicity per se did not appear to fully explain the patterns of biological responses observed. Some of the observations with the three nano Ag (increases in alkaline phosphatase, catalase, gamma glutamyltranspeptidase, as well as decreases in glucose 6-phosphate dehydrogenase and glutathione reductase) are in the same direction as HepG2 responses to other nanomaterials composed of TiO2, CeO2, SiO2, CuO and Cu. Therefore, these biochemical responses may be due to micropinocytosis of nanomaterials, membrane damage, oxidative stress and/or cytotoxicity. Decreased G6PDH (by all three nano Ag forms) and GRD activity (only nano Ag R did not cause decreases) support and are consistent with the oxidative stress theory of Ag nanomaterial action.
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Cheng, Yuang-Tung, Tsung-Lin Lu, Min-Han Hong, Jyh-Jier Ho, Chau-Chang Chou, Jiajer Ho, and Tung-Po Hsieh. "Evaluation of Transparent ITO/Nano-Ag/ITO Electrode Grown on Flexible Electrochromic Devices by Roll-to-Roll Sputtering Technology." Coatings 12, no. 4 (March 27, 2022): 455. http://dx.doi.org/10.3390/coatings12040455.

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This paper explores the flexible ITO/nano-Ag/ITO multilayer electrodes grown on polyethylene terephthalate (PET) substrates and processed by a continuous roll-to-roll (R2R) sputtering system at room temperature used for flexible electrochromic device (ECD) applications. The effect of the nano-Ag interlayer thickness on the electrical and optical properties of the flexible ITO/nano-Ag/ITO multilayer was thoroughly investigated. By using R2R-sputtered at an Ag DC power of 0.2 kW, we were able to achieve optimal ITO/nano-Ag/ITO multilayer that exhibits a high optical transmittance of 87.19% and the best figure of merit value (30.93 × 10−3 Ω−1). The EC performance and stability of the flexible devices were tested by a cathodic WO3 coloration. Coloring and bleaching tests show that ITO/nano-Ag/ITO multilayers are highly effective conductors, indicating that the R2R sputtering technique is a promising continuous sputtering process in preparing for the fabrication of optical devices and flexible electronics industries.
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Lê, Thị Kim Anh, Đại Vương Lê, Quốc Bảo Võ Văn, Thị Phương Nga Nguyễn, Hữu Thịnh Nguyễn, Thị Quỳnh Anh Nguyễn, and Thị Thảo Hiền Phạm. "ẢNH HƯỞNG CỦA MỘT SỐ YẾU TỐ ĐẾN QUÁ TRÌNH CHẾ TẠO NANO BẠC SỬ DỤNG DỊCH CHIẾT LÁ VỐI LÀM TÁC NHÂN KHỬ." Hue University Journal of Science: Natural Science 131, no. 1A (March 31, 2022): 119–26. http://dx.doi.org/10.26459/hueunijns.v131i1a.6295.

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Trong nghiên cứu này, chúng tôi trình bày phương pháp điều chế dung dịch nano bạc (Ag) từ bạc nitrate (AgNO3) sử dụng dịch chiết lá vối làm tác nhân khử và alginate là chất hoạt động bề mặt. Chúng tôi khảo sát ảnh hưởng của nồng độ AgNO3, tỷ lệ thể tích giữa AgNO3 và dịch chiết lá vối và thời gian phản ứng đến quá trình tạo nano Ag. Điều kiện tối ưu để tổng hợp nano Ag sử dụng dịch chiết lá vối gồm nồng độ AgNO3 4 mM, tỷ lệ thể tích Vdịch chiết /VAgNO3 = 4:100, nồng độ alginate 1%, thời gian phản ứng 45 phút tại nhiệt độ phòng. Dung dịch nano Ag thu được có màu vàng nâu đồng nhất. Kết quả đo TEM, SEM, XRD và FT-IR của các mẫu cho thấy nano Ag đã được tổng hợp thành công; hạt nano có dạng hình cầu, cấu trúc đồng đều với kích thước hạt khoảng 19,0–26,6 nm.
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YEOH, L. M., M. AHMAD, and R. ABD-SHUKOR. "EFFECT OF NANO Ag ADDITION ON THE SUPERCONDUCTING AND TRANSPORT PROPERTIES OF YBa2Cu3O7-δ PREPARED BY SOL-GEL ROUTE." International Journal of Modern Physics B 22, no. 17 (July 10, 2008): 2741–48. http://dx.doi.org/10.1142/s0217979208039836.

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The effect of nano size Ag addition on the YBa 2 Cu 3 O 7-δ (Y-123) system has been investigated. 2–15% weight of nano size Ag was added to the Y-123 system prepared by using the sol-gel-solid-state method. The phase purity was investigated by the powder X-ray diffraction method. Energy Dispersive X-ray Analysis (EDAX) was used to determine the distribution of nano Ag in the samples, and the microstructure was observed using a Scanning Electron Microscope (SEM). The transport critical current density was found to increase with increase in nano Ag content.
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Dissertations / Theses on the topic "Nano-Ag"

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Gunputh, Urvashi Fowdar. "Antibacterial properties of TiO2 nanotubes coated with nano-ZnO and nano-Ag." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/11155.

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TiO2 nanotubes grown on titanium alloy are known to increase the biocompatibility of the alloy when used in dental/orthopaedic implants. Furthermore, their nanotubular structures can act as antibacterial agent carrier and as a scaffold for tissue engineering with the aim of adding antibacterial properties to the implant. This study aims at fabricating an antibacterial and biocompatible nanocomposite coating on Ti-6Al-4V involving nano-ZnO and nano-Ag. Initially, TiO2 nanotubes were self-assembled on the polished surface of medical grade Ti-6Al-4V alloy discs using anodisation. First silver nanoparticles were chemically reduced from silver ammonia using delta-δ-gluconolactone for different duration on the nanotubes to form TiO2-Ag composite coating. Nano HA was added to the latter coating with the aim of reducing toxicity from silver, hence forming TiO2-Ag-HA coating. Secondly, nano-ZnO was thermo-chemically grown on the TiO2 nanotubes using zinc nitrate and hexamethylenetetramine. They were then annealed at 350-550 oC hence forming TiO2-ZnO. HA was grown on the latter coating by a biomimetic method whereby the coated discs were placed in a concentrated simulated body fluid at 37 oC forming TiO2-ZnO-HA. The stability of the 4 coatings, TiO2-Ag, TiO2-Ag-HA, TiO2-ZnO and TiO2-ZnO-HA were assessed using the dialysis method (n=3 each) and then exposed to S.aureus for 24 hours in BHI broth. Their antibacterial properties were assessed using different assays and microscopic imaging with respect to different controls (n=6 each for assays and n=3 for imaging). Their biocompatibility properties were assessed in the presence of primary human osteoblast cells in DMEM media with the help of biochemical assays, molecular gene expression and microscopic imaging (n=3). Both silver and zinc coated nanotubes showed significant level of antibacterial properties with silver coating being more bactericidal than the coating containing zinc. Nonetheless, the zinc oxide coatings were more biocompatible than the silver coating. Nano silver and zinc oxide containing composite coatings were successfully synthesised and tested in the presence of bacteria and human cells. The final conclusion was that nano-silver was still toxic and nano-ZnO coatings were more biocompatible.
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Bachmann, Andreas R. "Gestufte Cu-Oberflächen und Ag-Nano-Streifen atomare und elektronische Struktur /." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=970380801.

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Zhang, Shuai. "Development and evaluation of Ag-PTFE based nano-composite coatings for medical devices." Thesis, University of Dundee, 2016. https://discovery.dundee.ac.uk/en/studentTheses/763804f7-52f4-4fae-bed7-3c58e21e24ad.

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Wesner, Daniel [Verfasser]. "Nano-Bio-Technologie : Nanopartikel, zelluläre Strukturen und Bindungsreaktionen / Daniel Wesner. Fakultät für Physik - AG Biophysik und angewandte Nanowissenschaften." Bielefeld : Universitätsbibliothek Bielefeld, Hochschulschriften, 2012. http://d-nb.info/1022747436/34.

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Veron, Olivier. "Etude des mécanismes de coloration de verres obtenue par échange ionique Ag+/Na+ et précipitation de nano agrégats métalliques." Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00617160.

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L'objectif est d'étudier par la méthode d'échange ionique à l'argent de verres silicatés la coloration induite etla réalisation de guides d'ondes planaires. Deux méthodes de modélisation de l'échange ionique sont présentées pour évaluer les paramètres de l'échange qui sont le coefficient de diffusion, la forme du profil et la mobilité des ions. Cette technique purement thermique permet la réalisation de guides d'onde à gradient d'indice, l'ajout d'un champ électrique permet d'obtenir un profil à saut d'indice. Différentes compositions de verre sont étudiées dans le but de déterminer la variation d'indice induite par la polarisabilité de l'ion argent plus forte que les ions sodium ou lithium initialement présents dans les verres. A la suite de l'échange ionique, un recuit peut être effectué dans le but de précipiter l'argent en nanoparticules métalliques qui possèdent des propriétés d'absorption intéressantes permettant de colorer les verres : la résonance plasmon de surface (RPS). Le mécanisme de formation de ces nanoparticules dépend de la température et de l'effet redox de l'environnement. L'irradiation effectuée par un laser pulsé nanoseconde des verres échangés permet la précipitation locale des nanoagrégats d'argent à la surface des verres. L'irradiation pulsée en régime femtoseconde permet une interaction dans le volume du verre, soit avec des nanoparticules déjà présentes dans le but de modifier la couleur localement, soit avec des verres échangés dans lequel des défauts sont générés pour ensuite favoriser la formation de nanoparticules par recuit. La modélisation de la résonance plasmon de surface effectuée permet d'évaluer le mécanisme de croissance des nanoparticules dans les verres. Les méthodes de caractérisation utilisées sont la microscopie électronique à balayage, la microscopie électronique en transmission, la spectrophotométrie UV/Visible, la photoluminescence et la spectroscopie infrarouge à transformée de Fourier.
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Viefhues, Martina [Verfasser]. "Analysis and preparation of (bio)nanoobjects in nano-microfluidic devices / Martina Viefhues. Fakultät für Physik - AG Biophysik und angewandte Nanowissenschaften." Bielefeld : Universitätsbibliothek Bielefeld, Hochschulschriften, 2013. http://d-nb.info/1029760381/34.

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Medrano, Sandonas Leonardo Rafael. "Influencia del desorden sobre la estructura atómica y las propiedades electrónicas de nano-partículas mono-metálicas de Cu y Ag." Master's thesis, Universidad Nacional Mayor de San Marcos, 2012. https://hdl.handle.net/20.500.12672/12342.

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Estudia la influencia del desorden químico y estructural sobre la estructura atómica y las propiedades electrónicas de un conjunto de nano-partículas mono-metálicas de plata y cobre con un número de átomos constituyentes especiales (números mágicos icosaedrales) que varía de 13 a 5083 átomos. Las nano-partículas son formadas mediante simulaciones de dinámica molecular usando un potencial de Johnson, basado en el método del átomo incrustado, para el cobre y un potencial tight-hinding para la plata. Además, se estudia el efecto del desorden químico en las nano-partículas haciendo variar la energía de sitio del Hamiltoniano electrónico tipo tight-hinding según una distribución uniforme. El desorden estructural fue producido aumentando la velocidad del enfriamiento durante el proceso de formación de la nano-partícula.
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Cuba, Supanta Gustavo. "Influencia de la velocidad de enfriamiento sobre las propiedades estructurales y electrónicas de nano-hilos mono-metálicos de Ag y Cu." Master's thesis, Universidad Nacional Mayor de San Marcos, 2014. https://hdl.handle.net/20.500.12672/5786.

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Estudia la influencia de la velocidad de enfriamiento (cooling rate o freezing) sobre las propiedades estructurales y electrónicas de nano-hilos mono-metálicos de plata y cobre constituidos con un número desde 200 hasta 5880 átomos correspondientes a diámetros de 0.49 a 2.86 nm para la plata y de 0.43 a 2.53 nm para el cobre y una longitud de 16.34 y 14.46 nm respectivamente.
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Acharya, Danda Pani. "Atomic Manipulation and Tunneling Spectroscopy on Metal and Semiconductor Surfaces." View abstract, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3292889.

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Khodja, Walid. "Organisation de nano-matériaux inorganiques au sein de matrices supramoléculaires poreuses recyclables." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30016.

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L'inclusion de nanoparticules métalliques dans des réseaux supramoléculaires poreux a connu un essor très important au cours des dernières années. En effet ces matériaux hybrides combinent les propriétés liées aux réseaux supramoléculaires poreux, telles qu'une importante surface spécifique et une grande modulation chimique des pores, et celles qui sont intrinsèques aux nanoparticules métalliques, comme les propriétés catalytiques ou optiques. De ce fait, ces matériaux composites sont explorés dans les domaines de la catalyse ou de la détection. Les réseaux supramoléculaires poreux regroupent trois grandes familles de structures bien distinctes, selon les interactions qu'elles mettent en œuvre pour maintenir leur intégrité structurale. Nous distinguons en premier les réseaux construits par des liaisons de coordination, appelés MOF (" Metal Organic Framework "). Ces réseaux poreux ont été largement étudiés pour l'incorporation de nanoparticules métalliques avec diverses fonctionnalités à la clé. Les réseaux supramoléculaires obtenus par associations covalentes, nommés COF (" Covalent Organic Framework "), ont été relativement peu exploités pour la croissance in situ de nanoparticules métalliques. Enfin, les architectures supramoléculaires poreuses dont la cohésion structurale est assurée par des interactions faibles telles que la liaison Hydrogène, et qui sont connus sous le sigle HOF (" Hydrogen-bonded Open Framework "), n'ont, à notre connaissance, jamais été mis en œuvre comme support de croissance de nanoparticules métalliques. L'objectif de cette thèse a été donc d'explorer la possibilité d'utiliser les architectures supramoléculaires poreuses fondées sur la liaison Hydrogène, comme matrices pour la croissance contrôlée de nanoparticules de métaux nobles. La première partie de la thèse fut consacrée à l'élaboration de cristaux de dimensions sub-micrométriques d'une architecture poreuse supramoléculaire, développée dans l'équipe et connue sous le pseudonyme SPA-2 (" Supramoléculaire Porous Architecture "), grâce à des conditions opératoires solvo-thermales. Deux raisons ont motivé notre choix pour cette matrice : sa porosité (estimée à 53 %), ainsi que ses canaux décorés par des fonctions pyridyls. La deuxième partie de ces travaux de recherche a conduit à l'obtention du matériau hybride Au@SPA-2. La synthèse de ce matériau procède par une fonctionnalisation des nanocristaux de SPA-2 par des thiocyanates, suivie d'une imprégnation, puis d'une photo-réduction du précurseur moléculaire d'or photosensible (Me2SAuCl). La post-fonctionnalisation du SPA-2 permet une imprégnation efficace en or (5 à 10 % de la masse totale). L'exposition au rayonnement ultraviolet du matériau [Au-SCN]@SPA-2 permet de réduire le complexe d'or, puis de générer des nanoparticules. Pour notre système hybride, il est possible de contrôler la taille des nanoparticules d'or (de 1 à 25 nm) par la durée d'irradiation. Il s'agit de la première synthèse de nanoparticules métalliques au sein d'une matrice supramoléculaire poreuse fondée sur l'interaction Hydrogène, jamais rapportée à ce jour dans la littérature. La troisième partie des travaux a été centrée sur la synthèse du matériau hybride Ag@SPA-2, avec la même stratégie qui a été mise en œuvre pour l'or, à savoir le piégeage d'un précurseur d'argent photosensible (AgNO3) par un anion, ici un chlorure, localisé dans les canaux du SPA-2. Des nanoparticules d'argent sont obtenues dans les canaux de SPA-2 par photo-réduction, sous UV, du matériau AgCl@SPA-2. Les caractérisations de ce matériau hybride mettent en évidence des nanoparticules d'argent distribuées uniformément au sein des nanocristaux octaédriques de SPA-2. La matrice SPA-2 est recyclable. Par simple dissolution dans une eau légèrement acide, il est possible d'isoler les nanoparticules de métaux nobles des briques constitutives du réseau poreux SPA-2. À partir de la solution aqueuse, la matrice SPA-2 initiale est régénérée par cristallisation
The interest for imbedding metallic nanoparticles in porous supramolecular networks has grown considerably in recent years. Indeed, these hybrid materials combine the properties related to porous supramolecular networks, such as a controlled porosity, large specific surface area, versatile chemical modulation; and those that are intrinsic to metal nanoparticles, such as catalytic or optical properties. As a result, these composite materials are explored in the fields of catalysis or detection. Porous supramolecular networks consist in three large families of distinct compounds, according to the interactions that they implement to maintain their structural integrity. We first distinguish the networks built by coordination bonds, called MOF (" Metal Organic Framework "). These porous networks have been widely studied for the incorporation of metal nanoparticles with various functionalities. The supramolecular networks obtained by covalent associations, named COF (" Covalent Organic Framework "), have been relatively little explored for the in situ growth of metallic nanoparticles. Finally, porous supramolecular architectures whose structural cohesion is ensured by weak interactions such as Hydrogen bonds, known by the acronym HOF (" Hydrogen-bonded Open Framework "), have, to the best of our knowledge, never been reported as a growth support for metallic nanoparticles. The aim of this thesis was to explore the possibility of using the porous supramolecular architectures based on hydrogen bonds as matrices for the controlled growth of noble metal nanoparticles. The first part of the thesis was devoted to the development of sub-micrometric crystals of a supramolecular porous architecture developed in the team and known under the pseudonym SPA-2 (" Supramoléculaire Porous Architecture "). Two reasons motivated our choice for this matrix: its porosity (estimated at 53%), as well as its channels decorated by pyridyl functions. The second part of this research led to the conception of the Au@SPA-2 hybrid material. The synthesis of this material proceeds by functionalizing the nanocrystals of SPA-2 with thiocyanates, followed by impregnation, then by a photo-reduction of the photosensitive gold molecular precursor (Me2SAuCl). The post-functionalization of the SPA-2 allows an effective impregnation in gold (5 to 10% of the total mass). The ultraviolet radiation exposure of the [Au-SCN]@SPA-2 material makes it possible to reduce the gold complex and then to generate nanoparticles. For our hybrid system, it is possible to control the size of gold nanoparticles (from 1 to 25 nm) by the duration of irradiation. This is the first synthesis of metallic nanoparticles in a porous supramolecular matrix based on the Hydrogen interactions ever reported. The third part of our research work focused on the synthesis of the Ag@SPA-2 hybrid material, with the same strategy that has been implemented for gold, namely the trapping of a photosensitive silver precursor (AgNO3), by an anion, here a chloride, located in the channels of SPA-2 network. Silver nanoparticles were obtained by photo-reduction, under UV light, of the material AgCl@SPA-2. The characterizations of this hybrid material revealed silver nanoparticles distributed uniformly within SPA-2 crystals. The matrix SPA-2 is recyclable. By simply dissolving the hybrid materials (Au@SPA-2 or Ag@SPA-2) in a slightly acidic aqueous solution, it was possible to isolate the metal nanoparticles from the molecular components of the SPA-2 porous network. From this solution, the initial SPA-2 matrix was regenerated by crystallization
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Book chapters on the topic "Nano-Ag"

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Ghosh, Dhriti Sundar. "Ag/Al:ZnO Nano-Thick Bilayer TEs." In Ultrathin Metal Transparent Electrodes for the Optoelectronics Industry, 59–67. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00348-1_6.

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Hu, Chun. "Solar Photocatalytic Disinfection by Nano-Ag-Based Photocatalyst." In Green Chemistry and Sustainable Technology, 129–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53496-0_6.

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Brinkfeldt, K., J. Simon, K. Romanjek, S. Noel, M. Edwards, J. Räthel, M. Da Silva, and D. Andersson. "Sintered Nano-Ag as Joining Material for Thermoelectric Modules." In Proceedings of the 11th European Conference on Thermoelectrics, 71–82. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07332-3_9.

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Yin, Jie, Yun Zhang, Guang Fu Yin, and Ping Zhang. "Preparation of Nano-Ag Particles and Antibacterial Dope Loaded Silver." In Key Engineering Materials, 2115–17. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.2115.

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Mangalam, Jimmy, and Monika Joshi. "Grafting of Ag Nanoparticles on GO Nano Sheets for Water Purification." In Physics of Semiconductor Devices, 611–13. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03002-9_155.

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Yun, JiEun, and Dong Gun Lee. "Nano-Ag Particles and Pathogenic Microorganisms Antimicrobial Mechanism and its Application." In Essential Oils and Nanotechnology for Treatment of Microbial Diseases, 175–88. Boca Raton, FL : CRC Press/Taylor & Francis Group, 2017.: CRC Press, 2017. http://dx.doi.org/10.1201/9781315209241-8.

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Aufray, Bernard, Bénédicte Ealet, Haik Jamgotchian, Hichem Maradj, Jean-Yves Hoarau, and Jean-Paul Biberian. "Growth of Silicon Nano-ribbons on Ag(110): State of the Art." In Silicene, 183–202. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28344-9_9.

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Hu, Tao, Zongrong Wang, Liwen Tang, Ning Ma, and Piyi Du. "Formation of Silver Nano Particles in Percolative Ag-PbTiO3 Composite Dielectric Thin Film." In Ceramic Transactions Series, 51–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118771402.ch5.

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Yu-qi, Xiao, Wang De-guo, Zhang Si-wei, Guo Yanbao, and Gao Mang-lai. "Fabrication and Nano-Tribological Behaviors of PDDA/Ag NPs Composite Molecular Deposition Films." In Advanced Tribology, 499–502. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03653-8_157.

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Ranjan, Prabhat, Tanmoy Chakraborty, and Ajay Kumar. "Theoretical analysis: Electronic and optical properties of small Cu-Ag nano alloy clusters." In Computational Chemistry Methodology in Structural Biology and Materials Sciences, 259–71. Toronto; New Jersey: Apple Academic Press, 2017.: Apple Academic Press, 2017. http://dx.doi.org/10.1201/9781315207544-9.

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Conference papers on the topic "Nano-Ag"

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Dillu, Venus, and Ravindra K. Sinha. "Ag-GaAs-Ag quantum nano-lenses system for plexcitonic interaction." In International Conference on Fibre Optics and Photonics. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/photonics.2014.t3a.42.

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Xiaobing Dong, Chuanxiang Xu, and Xiuchen Jiang. "Dielectric characteristics of nano-Ag/SP composite." In Proceedings of 2005 International Symposium on Electrical Insulating Materials, 2005. (ISEIM 2005). IEEE, 2005. http://dx.doi.org/10.1109/iseim.2005.193575.

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Zheng, Zhen, Fan Yang, and Chunqing Wang. "Study of interconnection between Ni nano-array and nano-Ag solder." In 2016 17th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2016. http://dx.doi.org/10.1109/icept.2016.7583263.

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Majles Ara, M. H., Z. Dehghani, E. Saievar Iranizad, and S. Salmani. "Nonlinear Responses and Optical Limiting Behavior of Ag Nano-Particles." In 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70174.

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Ag nano-particles have been synthesized and the formation and microstructure of Ag particles, were monitored by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Visible spectrum and z-scan technique. XRD pattern confirmed the cubic structure of the synthesized material. The UV-Visible spectrum of this material shows an absorption peak about 200 nm wavelengths. Optical limiting (OL) property of Ag nano-particles is studied. The nonlinear refractive indices of Ag nano-particles were defined by the z-scan technique using CW He-Ne laser (λ = 632.8 nm) at different incident intensities. The results reveal that the new complex exhibits strong nonlinear optics refraction effect such as self-focusing and the magnitude of n2 was measured in order of 10−7 (cm2/W) with a negative sign.
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Peng, Luohan, and Hong Liang. "Nano Wear of Noble Metals Against Silicon." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44227.

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We study the wear behavior of noble metals against a semiconductor substrate within a highly focused area. The nano-wear was generated on the tip of an atomic force microscope (AFM). The substrate is single crystal silicon. AFM tips were coated with noble metals, gold and silver, so that no complication of oxidation was introduced. The Au-Si and Ag-Si are two eutectic systems. The Au and Si atoms are more compatible compared with that of the Ag and Si system. During nano-wear experiments, the Au or Ag coated AFM tip slid against Si substrate. It was found that the Au tip showed adhesive wear but Ag tip showed abrasive wear. In this paper, we report results obtained in the nanoscale wear.
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Lee, S. W. R., J. C. C. Lo, X. Qiu, and N. Tu. "Solderability and Reliability of Sintered Nano-Ag Bond Pads of Printed Re-Distribution Layer (RDL)." In ASME 2021 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ipack2021-74199.

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Abstract Re-distribution layer (RDL) is one key enabling technology for advance packaging. RDL is usually fabricated in wafer level by photolithography process. An alternative approach for implementing RDL by additive manufacturing (AM) method is proposed in this study. This allows RDL to be fabricated on singulation chip. Nano-silver (nano-Ag) ink is printed on the silicon chip to form routing traces and bond pads. However, the Ag pad may be consumed by solder quickly if the process is not properly controlled. This paper studied the effect of nano-Ag ink sintering condition on the solderability of Ag pad. The solder joint mechanical integrity was evaluated by solder ball shear test. High temperature storage test was also carried out to evaluate the solder joint reliability. Experiment results showed that Ag pad fabricated by AM is SMT compatible. High temperature storage did not cause early failure to the samples. There was not significant change in the Ag3Sn IMC layer thickness and mechanical strength. The finding of the present study will serve as a very useful reference for future practice of forming solder joints on sintered nano-Ag pads.
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Deepa, K., S. Lilly Angel, N. Rajamanickam, K. Jayakumar, and K. Ramachandran. "Structural and dielectric studies on Ag doped nano ZnSnO3." In DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5028639.

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Jo, Y., S. Park, S. Lee, M. Jung, M. Kyum, K. Park, and Y. Kim. "Nano-sized effect on the magnetic properties of Ag." In INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.376193.

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Zhou, Chenfei, Zheng Lv, Xiuzhen Lu, Amos Nkansah, and Johan Liu. "A novel nano-Ag paste with Ag-rGO and its application in GF/Cu laminated structure." In 2022 23rd International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2022. http://dx.doi.org/10.1109/icept56209.2022.9873318.

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Dadiel, Longji, Miryala Muralidhar, and Masato Murakami. "Improved superconducting performance of Ag-added nano-diamond doped MgB2." In Superconductivity and Particle Accelerators 2018, edited by Ryszard S. Romaniuk and Dariusz Bocian. SPIE, 2019. http://dx.doi.org/10.1117/12.2525216.

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Reports on the topic "Nano-Ag"

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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova, and Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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