Journal articles: '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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Huynh, Luan Nguyen Thanh, Cuong Chi Huynh, Nhan Thuc Chi Ha, Vinh Quang Lam, and Hieu Van Le. "Synthesis and study on mechanical properties of the polypropylene/TiO2 - nano Ag composite for antibacterial application." Science and Technology Development Journal 18, no. 1 (March 31, 2015): 70–80. http://dx.doi.org/10.32508/stdj.v18i1.1036.

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In this study, PP/TiO2 – nano Ag composite were successfully prepared by melt mixing method. The composites TiO2 – nano Ag and PP/TiO2 – nano Ag with different silver content were characterized by scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Xray diffraction (XRD) and IR spectrum to investigate their morphology and chemical compositions. It was found that the silver nanoparticles in TiO2 matrix were uniformly distributed and strongly attached to the polypropylene matrix and the average particle size of TiO2 – nano Ag was from 30 to 60 nm. As the result, the antibacterial property was obtained via microorganism test by showing the elimination of more than 99 % of E. coli bacteria. And UV protection behavior was also observed by UV-Vis characterization. In the other hand, the mechanical properties of polypropyleneTiO2-nano Ag composite were noticeably improved as compared to the neat polypropylene.

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Xia, Chun-feng, Jiang Wu, and Wei Wang. "Design and Study of Mountaineering Wear Based on Nano Antibacterial Technology and Prediction Model." International Journal of Healthcare Information Systems and Informatics 17, no. 1 (January 1, 2022): 1–16. http://dx.doi.org/10.4018/ijhisi.315631.

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In order to improve function of mountaineering wear to promote the development of outer mountaineering wear industry, nano antibacterial technology is applied to make mountaineering wear. Firstly, the antibacterial properties of nano materials are discussed. Secondly, the antibacterial performance experiment of nano Ag ion is design, and experimental results show that the antibacterial performance of nano Ag ion, and nano Ag ion has better antibacterial effect on staphylococcus aureus, Escherichia coli, and candida albicans. Thirdly, the antibacterial performance prediction model of nano materials is constructed based on wavelet neural network, and then the training algorithm is designed. Finally, the prediction simulation analysis of antibacterial performance of nano Ag ion in moutaineering wear is carried out, results show that the wavelet neural network has good prediction effect, prediction results from wavelet neural network are agreed with real values, therefore the wavelet neural network has higher prediction precision.

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Đỗ, Thị Huế, Thị Thu Hương Trần, and Khắc Khôi Trần. "CỘNG HƯỞNG PLASMON BỀ MẶT ĐỊNH XỨ CỦA CẤU TRÚC LÕI/ VỎ AuR/Ag VỚI BỀ DÀY LỚP VỎ Ag THAY ĐỔI." SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 7, no. 21 (July 29, 2021): 30–36. http://dx.doi.org/10.51453/2354-1431/2021/455.

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Bài báo này trình bày việc chế tạo các hạt nano cấu trúc lõi/vỏ AuR/Ag với lõi là thanh nano vàng, vỏ là lớp nano bạc theo phương pháp hóa khử. Công việc này gồm hai quá trình độc lập bao gồm việc tổng hợp và khảo sát đặc tính quang của các thanh nano vàng, sau đó sử dụng các thanh nano vàng làm hạt lõi cho giai đoạn tiếp theo để hình thành cấu trúc lõi/vỏ AuR/Ag. Sử dụng phổ hấp thụ UV-VIS nghiên cứu tính chất quang của các cấu trúc lõi/vỏ AuR/Ag, đồng thời khảo sát ảnh hưởng của nồng độ Ag+ đến sự hình thành và tính chất quang của phức hệ AuR/Ag. Kết quả cho thấy tính chất quang của AuR/Ag phụ thuộc mạnh vào lượng tiền chất hình thành lớp vỏ là ion Ag+. Khi lượng Ag+ càng lớn thì lớp vỏ bạc càng dày, các đỉnh cộng hưởng plasmon của thanh dịch về phía sóng ngắn và động thời xuất hiện đỉnh cộng hưởng tại bước sóng 353 nm với sự đóng góp của các điện tử của lớp vỏ bạc dao động theo chiều ngang của thanh.

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Zhao, Xiaoyu, Wei Xu, Xiuxia Tang, Jiahong Wen, and Yaxin Wang. "Design of Ag/TiO2/Ag Composite Nano-Array Structure with Adjustable SERS-Activity." Materials 15, no. 20 (October 19, 2022): 7311. http://dx.doi.org/10.3390/ma15207311.

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How to fabricate large area controllable surface-enhanced Raman scattering (SERS) active nanostructure substrates has always been one of the important issues in the development of nanostructure devices. In this paper, nano-etching technology and magnetron sputtering technology are combined to prepare nanostructure substrate with evolvable structure, and Ag/TiO2/Ag composites are introduced into the evolvable composite structure. The activity of SERS is further enhanced by the combination of TiO2 and Ag and the electron transfer characteristics of TiO2 itself. Deposition, plasma etching, and transfer are carried out on self-assembled 200 nm polystyrene (PS) colloidal sphere arrays. Due to the shadow effect between colloidal spheres and the size of metal particles introduced by deposition, a series of Ag/TiO2/Ag nanostructure arrays with adjustable nanostructure substrates such as nano-cap (NC), nano cap-star (NCS), and nano particle-disk (NPD) can be obtained. These nanoarrays with rough surfaces and different evolutionary structures can uninterruptedly regulate optical plasmon resonance and reconstruct SERS hotspots over a large range, which has potential application value in surface science, chemical detection, nanometer photonics, and so on.

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Liu, Yang, Jingxin Sang, Hao Liu, Haiqin Xu, Shuguang Zhao, Jiatong Sun, Ju Hwan Lee, Hae-Chang Jeong, and Dae-Shik Seo. "Decreasing the Residual DC Voltage by Neutralizing the Charged Mobile Ions in Liquid Crystals." Crystals 9, no. 4 (March 27, 2019): 181. http://dx.doi.org/10.3390/cryst9040181.

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The decrease of the residual direct current (DC) voltage (Vrdc) of the anti-parallel liquid crystal (LC) cell using silver (Ag)-doped Polyimide (Ag-d-PI) alignment layers is presented in this manuscript. A series of Ag/PI composite thin layers are prepared by spurting or doping PI thin layers with Ag nano-particles, and Ag/PI composite thin layers are highly transparent and resistive. LC are homogeneously aligned between 2.0 mg/ml Ag-d-PI alignment layers, and the Vrdc of the cell that assembled with Ag-d-PI alignment layers decreases about 82%. The decrease of Vrdc is attributed to the trapping and neutralizing of mobile ions by Ag nano-particles. Regardless of the effect of Ag nano-particles on the conductivity of Ag-d-PI alignment layers, the voltage holding ratio (VHR) of the cells is maintained surprisingly. The experiment results reveal a simple design for a low Vrdc LC cell.

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Li, Yan, Zhiping Xu, Hongying Qi, Zheng Zhu, Sisi Chen, and Guiqin Zhang. "Observation and Nursing of the Curative Effect of Ag/TiO2 Nanomaterials on Bacterial Vaginosis and Trichomonal Vaginitis." Journal of Nanoscience and Nanotechnology 20, no. 12 (December 1, 2020): 7419–24. http://dx.doi.org/10.1166/jnn.2020.18624.

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This study investigated the effect of nano-Ag/TiO2 composite antibacterial agent on bacterial vaginosis and trichomonas vaginitis. Bacterial vaginosis and trichomonas vaginitis were treated with nano-Ag/TiO2 composite antibacterial agent (composite treatment group) and ornidazole suppository (traditional treatment group). Vaginal secretions from both treatment groups were analyzed to determine the effectiveness of the methods. The effective rate of the nano-Ag/TiO2 composite antibacterial agent was 97.0% for bacterial vaginosis and 94.4% for trichomonas vaginitis. The traditional treatment method, ornidazole suppository, showed an effective rate of 79.5% for bacterial vaginitis and 88.9% for trichomonas vaginitis. Therefore, the nano-Ag/TiO2 composite antibacterial agent was determined to be an effective treatment method for bacterial vaginosis and trichomonas vaginitis.

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Liu, Jiaxin, Yun Mou, Yueming Huang, Jiuzhou Zhao, Yang Peng, and Mingxiang Chen. "Effects of Bonding Materials on Optical–Thermal Performances and High-Temperature Reliability of High-Power LED." Micromachines 13, no. 6 (June 17, 2022): 958. http://dx.doi.org/10.3390/mi13060958.

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The die-bonding layer between chips and substrate determinates the heat conduction efficiency of high-power LED. Sn-based solder, AuSn20 eutectic, and nano-Ag paste were widely applied to LED interconnection. In this paper, the optical–thermal performances and high-temperature reliability of LED with these bonding materials have systematically compared and studied. The thermal conductivity, electrical resistivity, and mechanical property of these bonding materials were characterized. The LED module packaged with nano-Ag has a minimum working temperature of 21.5 °C. The total thermal resistance of LED packaged with nano-Ag, Au80Sn20, and SAC305 is 4.82, 7.84, and 8.75 K/W, respectively, which is 4.72, 6.14, and 7.84 K/W higher after aging for 500 h. Meanwhile, the junction temperature change of these LEDs increases from 2.33, 3.76, and 4.25 °C to 4.34, 4.81, and 6.41 °C after aging, respectively. The thermal resistance of the nano-Ag, Au80Sn20 and SAC305 layer after aging is 1.5%, 65.7%, and 151.5% higher than before aging, respectively. After aging, the LED bonded with nano-Ag has the better optical performances in spectral intensity and light output power, which indicates its excellent heat dissipation can improve the light efficiency. These results demonstrate the nano-Ag bonding material could enhance the optical-thermal performances and high-temperature reliability of high-power LED.

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Dai, Gaopeng, Suqin Liu, Ying Liang, and Ke Liu. "Fabrication of a nano-sized Ag2CO3/reduced graphene oxide photocatalyst with enhanced visible-light photocatalytic activity and stability." RSC Adv. 4, no. 65 (2014): 34226–31. http://dx.doi.org/10.1039/c4ra04792c.

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Nano-sized Ag₂CO₃/RGO photocatalysts were fabricated by a facile chemical precipitation approach in DMF solvent. The Ag₂CO₃/RGO nanocomposites exhibited higher photocatalytic activity and stability than the pure nano-sized Ag₂CO₃.

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Chen, Ming, DaMeng Wang, and XiangDong Liu. "Direct synthesis of size-tailored bimetallic Ag/Au nano-spheres and nano-chains with controllable compositions by laser ablation of silver plate in HAuCl4 solution." RSC Advances 6, no. 12 (2016): 9549–53. http://dx.doi.org/10.1039/c5ra24578h.

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Bimetallic Ag/Au nano-spheres and nano-chains with controllable structures fabricated by laser ablation of Ag in HAuCl₄ solution without any potential toxic surfactants or adding extra reductants.

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Guo, Xiu Hua, Ke Xing Song, Shu Hua Liang, Qing Wang, and Yong Peng Wang. "Effect of Electrical Current on Wear Rate of Nano-Al₂O_3p/Cu Composite." Advanced Materials Research 97-101 (March 2010): 717–23. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.717.

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The nano-Al2O3p/Cu composite performed in this paper was prepared by internal oxidation. The nano-Al2O3p/Cu composite wire and the Cu-Ag alloy wire were slid against a copper-based powder metallurgy strip under unlubricated conditions. The wear behavior of nano-Al2O3p/Cu composite and Cu-Ag alloy were researched under different currents from 0~50A and sliding distance from 0~72Km. Worn surfaces of the nano-Al2O3p/Cu composite were analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). The results indicate that the nano-Al2O3p/Cu composite surface is dispersed with Al2O3 particles having a size of 10~20nm; the wear rate of both 0.60Al2O3p/Cu (containing 0.60wt.% Al2O3) composite and Cu-Ag alloy increases with the increasing electrical current and sliding distance, which increases abruptly at the beginning and smoothly subsequently; The wear rate of Cu-Ag alloy is 2-5 times that of 0.60Al2O3p/Cu composite without electrical current; The wear rate of Cu-Ag alloy is 5-10 times that of 0.60Al2O3p/Cu composite with electrical current of 30A-50A; The sensitivity of electrical current on the Cu-Ag alloy is more apparently than that on 0.60Al2O3p/Cu composite. Adhesive, abrasive, and electrical erosion wear are the dominant mechanisms during the electrical sliding processes.

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Thai, Sheau-Fung, Carlton P. Jones, Brian L. Robinette, Hongzu Ren, Beena Vallanat, Anna A. Fisher, and Kirk T. Kitchin. "Effects of Silver Nanoparticles and Silver Nitrate on mRNA and microRNA Expression in Human Hepatocellular Carcinoma Cells (HepG2)." Journal of Nanoscience and Nanotechnology 21, no. 11 (November 1, 2021): 5414–28. http://dx.doi.org/10.1166/jnn.2021.19481.

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In order to understand toxicity of nano silver, human hepatocellular carcinoma (HepG2) cells were treated either with silver nitrate (AgNO3) or with nano silver capped with glutathione (Ag-S) at various concentration. Differentially expressed genelists for mRNA and microRNA were obtained through Illumina RNA sequencing and DEseq data analyses. Both treatments showed non-linear dose response relationships for mRNA and microRNA. Gene expression analysis showed signaling pathways common to both nano Ag-S and AgNO3, such as cell cycle regulation, DNA damage response and cancer related pathways. But, nano Ag-S caused signaling pathway changes that were not altered by AgNO3 such as NRF2-mediated oxidative stress response inflammation, cell membrane signaling, and cell proliferation. Nano Ag-S also affected p53 signaling, survival, apoptosis, tissue repair, lipid synthesis, angiogenesis, liver fibrosis and tumor development. Several of the pathways affected by nano Ag-S are hypothesized as major contributors to nanotoxicity. MicroRNA target filter analysis revealed additional affected pathways that were not reflected in the mRNA expression response alone, including DNA damage signaling, genomic stability, ROS, cell cycle, ubiquitination, DNA methylation, cell proliferation and fibrosis for AgNO3; and cell cycle regulation, P53 signaling, cell proliferation, survival, apoptosis, tissue repair and so on for nano Ag-S. These pathways may be mediated by microRNA repression of protein translation.Our study clearly showed that the addition of microRNA profiling increased the numbers of signaling pathways discovered that affected by the treatments on HepG2 cells and gave US a better picture of the effects of these reagents in the cells.

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Mo, Fan, Qixing Zhou, and Yuqing He. "Nano–Ag: Environmental applications and perspectives." Science of The Total Environment 829 (July 2022): 154644. http://dx.doi.org/10.1016/j.scitotenv.2022.154644.

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Barani, Hossein, Majid Montazer, Tayebeh Toliyat, and Nasrin Samadi. "Synthesis of Ag-liposome nano composites." Journal of Liposome Research 20, no. 4 (February 4, 2010): 323–29. http://dx.doi.org/10.3109/08982100903544177.

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Yao, Lirong, Xiaojuan Li, Guangyu Zhang, Shanqing Xu, Dehong Cheng, and Yanhua Lu. "Preparation of Ag-containing ACF and its Application for Dye Removal." Journal of Engineered Fibers and Fabrics 12, no. 3 (September 2017): 155892501701200. http://dx.doi.org/10.1177/155892501701200305.

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Silver containing activated carbon fiber (Ag/ACF) has excellent adsorption properties for removing dyes. Silver particles are loaded onto ACF after carbonization and activation at present, and the fibers have low washing resistance and impurities are introduced onto ACF. In this research, pre-treatment techniques were used. Nano-silver solution with a particle size about 10 nm was prepared by using β-cyclodextrin as a stabilizer and reducer, and then the nano-silver solution was used as pretreatment liquid for modifying viscose fiber. Nano-silver particles with functional groups have high activity and can be readily adsorbed on the surface of viscose fibers. Ag/ACF was successfully prepared by carbonizing and activating the Ag-containing viscose fiber. The number and content of nano-silver particles on the surface of ACF was controlled by changing the concentration of nano-silver solution. The results show that the Ag/ACF have a high washing resistance and more efficiently remove methyl orange (MO) and methylene blue (MB) than ACF.

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Naskar, Atanu, Sohee Lee, Yunhee Lee, Semi Kim, and Kwang-sun Kim. "A New Nano-Platform of Erythromycin Combined with Ag Nano-Particle ZnO Nano-Structure against Methicillin-Resistant Staphylococcus aureus." Pharmaceutics 12, no. 9 (September 2, 2020): 841. http://dx.doi.org/10.3390/pharmaceutics12090841.

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Nano-particles have been combined with antibiotics in recent studies to overcome multidrug-resistant bacteria. Here, we synthesized a nano-material in which Ag nano-particles were assembled with a ZnO nano-structure to form an Ag-ZnO (AZO) nano-composite at low temperature. This material was combined with erythromycin (Ery), an antibiotic effective towards gram-positive bacteria, using three different approaches (AZO + Ery (AZE) [centrifuged (AZE1), used separately after 1-h gap (AZE2), without centrifugation (AZE3)]) to prepare a nano-antibiotic against clinical isolates of methicillin-resistant Staphylococcus aureus (MRSA). X-ray diffraction analysis and transmission electron microscopy confirmed the presence of Ag nano-particles and ZnO nano-structure. The elemental and chemical state of the elements present in the AZO nano-composite were assessed by X-ray photoelectron spectroscopy. The antibacterial activity of AZE samples against both Escherichia coli and S. aureus strains including MRSA was evaluated in antibacterial and morphological analyses. The AZE3 sample showed greater antibacterial activity than the other samples and was comparable to erythromycin. AZE3 was ~20-fold less prone to developing bacterial resistance following multiple exposures to bacteria compared to erythromycin alone. The AZE3 nano-composite showed good biocompatibility with 293 human embryonic kidney cells. Our newly synthesized nano-platform antibiotics may be useful against multidrug-resistant gram-positive bacteria.

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Scarpelli, Beatriz Brandão, Marília Franco Punhagui, Márcio Grama Hoeppner, Ricardo Sergio Couto de Almeida, Felipe Augusto Juliani, Ricardo Danil Guiraldo, and Sandrine Bittencourt Berger. "In Vitro Evaluation of the Remineralizing Potential and Antimicrobial Activity of a Cariostatic Agent with Silver Nanoparticles." Brazilian Dental Journal 28, no. 6 (December 2017): 738–43. http://dx.doi.org/10.1590/0103-6440201701365.

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Abstract Cariostatic treatment has been shown to successfully arrest caries. However, it blackens the carious tooth structure. This study evaluated the effects of an experimental cariostatic agent with silver nanoparticles (Ag-Nano) using microhardness (MH) and microbiological tests. The cariostatic agents tested were: Saforide®, Cariestop®, Ancarie® and Ag-Nano. Sixty-six samples from deciduous enamel were submitted to initial (after pH cycling to obtain initial caries-like lesion) and final (after cariostatic application) MH testing and %MH values were calculated. After longitudinal sectioning, internal (I) MH was evaluated. Strains of Streptococcus mutans, Escherichia coli, and Enterococcus faecalis in brain-heart infusion culture were treated with the cariostatic agents. Agar diffusion tests (ADTs) were performed and minimum inhibitory concentrations were determined. The statistical tests used were: Kruskal-Wallis and Dunn (%MD; ADT; MIC) and ANOVA followed by Tukey’s test (I-MH) (p<0.05). The %MH of Saforide® was significantly greater than that of Ag-Nano (p<0.05). Internal MH showed progressive improvement in the enamel remineralization for all cariostatic tested. In ADTs showed greater inhibition of S. mutans, E. faecalis, and E. coli by Saforide® than by Ancarie® and Ag-Nano. Ag-Nano was able to inhibit 100% microorganism growth at a lower concentration than required for the other agents. It was concluded that Ag-Nano treatment promoted remineralization of deciduous tooth enamel with initial caries-like lesion and bactericidal activity.

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Nguyen, Thi-Hiep, Young-Hee Kim, Ho-Yeon Song, and Byong-Taek Lee. "Nano Ag loaded PVA nano-fibrous mats for skin applications." Journal of Biomedical Materials Research Part B: Applied Biomaterials 96B, no. 2 (November 17, 2010): 225–33. http://dx.doi.org/10.1002/jbm.b.31756.

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Ren, Keming, Tang Ye, Yong Zhang, and Abasifreke Ebong. "The Role of Nano-crystallites on Conduction Mechanisms of Current Through Ag Gridlines of Si Solar Cells." MRS Advances 4, no. 5-6 (2019): 311–18. http://dx.doi.org/10.1557/adv.2019.67.

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ABSTRACTIn order to understand the impact of nano-crystallites on current transport mechanisms in screen-printed c-Si solar cells with lowly-doped emitter, Te-glass based Ag pastes with different transition temperatures (Tg) were used. The Te-glass with lower Tg showed lower Rc than the one with higher Tg due to the formation of nano-crystallites in the glass layer. These nano-crystallites enhance the conductivity of the glass and lead to higher fill factor (FF). The nature of these nano-crystallites was first identified by the Raman spectrometry and the peaks at 76 cm-1, 119 cm-1 and 145 cm-1 were corresponding to Ag2Te and PbTe. The conductive-AFM further confirmed the high conductivity of these nano-crystallites without pyramidal Ag crystallites, which means the current transporting from Si emitter to Ag gridlines is mainly through the nano-crystallites in the glass.

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Łozicki, Andrzej, Tomasz Niemiec, Robert Pietrasik, Sylwester Pawęta, Anna Rygało-Galewska, and Klara Zglińska. "The Effect of Ag Nanoparticles and Multimicrobial Preparation as Factors Stabilizing the Microbiological Homeostasis of Feed Tables for Cornu aspersum (Müller) Snails on Snail Growth and Quality Parameters of Carcasses and Shells." Animals 10, no. 12 (December 1, 2020): 2260. http://dx.doi.org/10.3390/ani10122260.

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The aim of this research was to evaluate the effect of Ag nanoparticles (nano-Ag) used in the paint covering feed tables or a multimicrobial preparation applied to feed tables on the microbiological composition of the feed table environment, the growth and mortality of snails, and selected parameters for assessing the quality of carcasses and snail shells. The research was carried out in a farm of Cornu aspersum (Müller) snails. In the control (K) group, paint without nano-Ag was used. In two other groups (N-Ag and N-Ag + effective microorganisms (EM)), the feed tables were covered with the same paint as in the control group but with the addition of 100 mg/L of nano-Ag it (N-Ag group). Additionally, multimicrobial preparation (EM Bokashi®) at a concentration of 10% was spread on the tables in the N-Ag + EM group. In the last group (EM), the feed tables were covered with paint without nano-Ag, and only multimicrobial preparation was applied at a concentration of 10%. During the tests, the body weight of snails was measured three times, and swab samples were taken from the feed tables for the examination of microbiological composition. At the end of the experiment, the snails were killed, and the weight of the carcass and the size of the shell were measured. The content of Ag and the degree of lipid oxidation (thiobarbituric acid reactive substances (TBARS)) in the carcasses were analyzed, and the content of Ca and the crushing strength of the shells were determined. In the N-Ag and N-Ag + EM groups, a significant reduction in the total number of bacteria, fecal streptococci, and Escherichia coli was found, while there was also a reduction in mold and fungi in the N-Ag + EM and EM groups. In the K and EM groups, the mortality of animals was higher than in the nano-Ag groups. In subsequent weight checks, the highest body weight was found in the EM group and the lowest in the N-Ag and N-Ag + EM groups. In addition, the carcass weight and shell size in the N-Ag group was significantly lower compared to the K and EM groups. In the N-Ag and N-Ag + EM groups, a higher Ag content in the carcasses and a greater degree of lipid peroxidation were found. The Ca content of the shells was the highest in the N-Ag group, and the hardness of shells was the highest in the N-Ag and N-Ag + EM groups.

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Anjum, Q., N. Nasir, S. A. Cheema, M. Imran, A. R. Rahman, Z. Tanveer, N. Amin, and Y. N. Anjam. "Multiscale modeling investigation into the thermal conductivity dynamics of graphene-silver nano-composites: a molecular dynamic study." Digest Journal of Nanomaterials and Biostructures 17, no. 2 (April 2022): 557–68. http://dx.doi.org/10.15251/djnb.2022.172.557.

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This research primarily aims at the in-depth exploration of thermal conductivity dynamics of Graphene-Silver (C-Ag) nano-composites on various parametric fronts. The parametric settings and resultant experimental states are mimicked by the rigorous launch of molecular dynamic (MD) simulations with Green-Kubo multiscale modeling approach. The enumeration of thermal conductivity of C-Ag nano-composites is instigated along with three orientations that is C-Ag (1 0 0), C-Ag (1 1 0) and C-Ag (1 1 1). Further, the conductive subtleties are expounded with respect to numerous factors of practical concerns such as, temperature, length of composite, composite width and number of Ag layers.

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Mahdi, Farouk, and Omar Mahmood. "Effect of Adding Nano Ag on Mechanical and Physical Properties of Cu–10% Fe Prepared by Powder Metallurgy Technique." Tikrit Journal of Engineering Sciences 28, no. 1 (March 10, 2020): 13–20. http://dx.doi.org/10.25130/tjes.28.1.02.

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Copper-matrix composites have received a lot of attention and are used widely in various applications, such as electronics, machinery, automobile, military and aerospace; because of their remarkable electrical conductivity, high thermal conductivity and excellent mechanical properties. Among these are copper-iron composites which found many engineering applications due to the role of Fe in enhancing the mechanical properties of these composites beside its low cost. However, Fe addition reduces electrical and thermal conductivity therefore, binary Cu-Fe composites are not suitable for applications where these properties are the main requirement. Many studies have been done to enhance these properties by the addition of alloying elements. The present work aims to study the effect of adding Nano Ag on mechanical and physical properties of Cu-10 wt% Fe composites prepared by powder metallurgy technique. The results showed the effectiveness of Nano Ag in enhancing both mechanical and physical properties of Cu-10 wt% Fe composite. It is found that bulk density, electrical conductivity, and thermal conductivity have been increased by 1.19%, 46%, and 46% respectively on adding 5% Nano Ag. Hardness and compression strength have been increased by 17.3% and 32.8% respectively by adding 4% Nano Ag, while wear rate was reduced by 13.4% by adding 4% Nano Ag.

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Lee, Juwon, Yoon Shon, Younghae Kwon, Ji-Hoon Kyhm, Deuk Young Kim, Joon Hyun Kang, Chang-Soo Park, Kyoung Su Lee, and Eun Kyu Kim. "Effects of Thermal Annealing on Optical and Microscopic Ferromagnetic Properties in InZnP:Ag Nano-Rods." Nanomaterials 12, no. 23 (November 25, 2022): 4200. http://dx.doi.org/10.3390/nano12234200.

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InZnP:Ag nano-rods fabricated by the ion milling method were thermally annealed in the 250~350 °C temperature range and investigated the optimum thermal annealing conditions to further understand the mutual correlation between the optical properties and the microscopic magnetic properties. The formation of InZnP:Ag nano-rods was determined from transmission electron microscopy (TEM), total reflectivity and Raman scattering analyses. The downward shifts of peak position for LO and TO modes in the Raman spectrum are indicative of the production of Ag ion-induced strain during the annealing process of the InZnP:Ag nano-rod samples. The appearance of two emission peaks of both (A0 X) and (e, Ag) in the PL spectrum indicated that acceptor states by Ag diffusion are visible due to the effective incorporation of Ag-creating acceptor states. The binding energy between the acceptor and the exciton measured as a function of temperature was found to be 21.2 meV for the sample annealed at 300 °C. The noticeable MFM image contrast and the clear change in the MFM phase with the scanning distance indicate the formation of the ferromagnetic spin coupling interaction on the surface of InZnP:Ag nano-rods by Ag diffusion. This study suggests that the InZnP:Ag nano-rods should be a potential candidate for the application of spintronic devices.

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Dimitrijevic, R., O. Cvetkovic, Z. Miodragovic, M. Simic, D. Manojlovic, and V. Jovic. "SEM/EDX and XRD characterization of silver nanocrystalline thin film prepared from organometallic solution precursor." Journal of Mining and Metallurgy, Section B: Metallurgy 49, no. 1 (2013): 91–95. http://dx.doi.org/10.2298/jmmb120111041d.

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The Ag nano-structured thin films prepared on flat glass substrates have been studied. The ball-like silver nanoparticles have been synthesized in large quantity by using a modified method of hydrolytic decomposition of silver complexes with amino types ligands formed in ethanol aqueous solution. SEM analysis revealed that Ag nanoparticles are all sphere shaped with bimodal size (40 and 70 nm) distribution. The results of XRD powder pattern examination show that Ag nanoparticles are pure phase, well crystallized. The unit cell dimensions measured on synthesized Ag nano films show small but frequent contraction in comparison to Ag metal standard.

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Zahornyi, M. M., O. P. Yavorovsky, V. M. Riabovol, N. I. Tyschenko, T. F. Lobunets, T. V. Tomila, O. V. Shirokov, A. V. Ragulya, and Ye M. Anisimov. "Morphological, spectral and toxicological features of new composite material of titanium nanodioxide with nanosilver for use in medicine and biology." Medicni perspektivi 27, no. 1 (March 30, 2022): 152–59. http://dx.doi.org/10.26641/2307-0404.2022.1.254381.

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The results of this study indicate that titanium dioxide nanoparticles (nano-TiO2) possess adsorptive, photocatalytic, bactericidal, virucidal and fungicidal properties, which are used in antibacterial coating, for air and water disinfection. In parallel with studies of the physicochemical characteristics of titanium dioxide, its toxicological assessment was carried out to prevent possible harmful effects on humans and the biosphere objects, followed by an assessment of the nano-TiO2 hazard class. To enhance these useful properties of nano-TiO2, nanopowders of titanium dioxide and a composite of titanium dioxide were synthesized with a silver (nano-TiO2 /Ag) by way of chemical precipitation of metatitanic acid adding silver nitrate to the composite at 500-600°C. It was stated that the synthesized nanostructures have the following characteristics: anatase crystal structure of TiO2 (anatase, rutile, brookite – natural crystalline modifications of TiO2), the size of Ag nanoparticles is 35-40 nm, TiO2 – 13-20 nm. Nanocomposite has surface defects of the crystal lattice (oxygen vacancies, impurities, excess electrons or holes), silver nanoparticles are localized on the surface of anatase TiO2, which increases adsorptive, photocatalytic, biological and specifically antibacterial properties of the composite material nano-TiO2/Ag. According to the parameters of acute intraperitoneal toxicity, the studied nanocomposite anatase nano-TiO2/Ag was classified as a moderately dangerous substance (material). Nano-TiO2 and TiO2/Ag nanocomposites do not cause local irritation to the skin, yet have a mildly irritating effect on the mucous membrane of the eye, and are also characterized by a weak sensitization effect.

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Jia, Mingxi, Wenjing Zhang, Taojin He, Meng Shu, Jing Deng, Jianhui Wang, Wen Li, et al. "Evaluation of the Genotoxic and Oxidative Damage Potential of Silver Nanoparticles in Human NCM460 and HCT116 Cells." International Journal of Molecular Sciences 21, no. 5 (February 27, 2020): 1618. http://dx.doi.org/10.3390/ijms21051618.

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Nano Ag has excellent antibacterial properties and is widely used in various antibacterial materials, such as antibacterial medicine and medical devices, food packaging materials and antibacterial textiles. Despite the many benefits of nano-Ag, more and more research indicates that it may have potential biotoxic effects. Studies have shown that people who ingest nanoparticles by mouth have the highest uptake in the intestinal tract, and that the colon area is the most vulnerable to damage and causes the disease. In this study, we examined the toxic effects of different concentrations of Ag-NPs on normal human colon cells (NCM460) and human colon cancer cells (HCT116). As the concentration of nanoparticles increased, the activity of the two colon cells decreased and intracellular reactive oxygen species (ROS) increased. RT-qPCR and Western-blot analyses showed that Ag NPs can promote the increase in P38 protein phosphorylation levels in two colon cells and promote the expression of P53 and Bax. The analysis also showed that Ag NPs can promote the down-regulation of Bcl-2, leading to an increased Bax/Bcl-2 ratio and activation of P21, further accelerating cell death. This study showed that a low concentration of nano Ag has no obvious toxic effect on colon cells, while nano Ag with concentrations higher than 15 μg/mL will cause oxidative damage to colon cells.

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Sankara Reddy, B., S. Venkatramana Reddy, R. P. Vijaya Lakshmi, and N. Koteeswara Reddy. "Preparation and Characterization of Ag and Co Doped ZnO Nano Particles." Advanced Materials Research 584 (October 2012): 248–52. http://dx.doi.org/10.4028/www.scientific.net/amr.584.248.

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Pure ZnO and Ag, Co doped ZnO nano particles [Zn1-xAgxCoyO, where x = 0.00 and 0.05, y = 0.05] were synthesized by chemical co precipitation method without use of surfactant. All the prepared samples calcinated in 1 hour at 500oC, after that the morphology of the samples were evaluated by Scanning Electron Microscope (SEM). The X- ray diffraction (XRD) results indicated that the synthesized co-doped ZnO nano crystals had the pure hexagonal structure without any significant change in the structure affected by Ag and Co substitution. Dopant elements Ag and Co are present in the ZnO host material and conformed by Energy Dispersive Analysis of X-ray Spectra (EDAX). The incorporation of Ag+ in the place of Zn2+ has made a considerable decrease in the size of nano crystals as compared to pure ZnO nano particles (It is to be noted that Co should be kept constant at 5 mol %). Blue emission was observed by Photo Luminescence (PL) Spectra.

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Yuan, Qinlin, Hang Xu, Shaokang Wang, Zhewen Yang, Wenke Zhang, and Qinggao Ma. "Preparation of Silver and Copper Co-impregnated Nano-ZnO Immobilized on Mesoporous SiO2 and its Photocatalytic Performance." Nature Environment and Pollution Technology 21, no. 2 (June 1, 2022): 659–67. http://dx.doi.org/10.46488/nept.2022.v21i02.025.

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To improve light usage, Ag and Cu were co-impregnated with nano-ZnO, and the mesoporous silica gel (meso-SiO2) was chosen as the carrier. The sol-gel method was used to successfully construct a composite photocatalyst with 3 percent Ag/0.1 percent Cu/nano-ZnO/meso-SiO2. For the evaluation of the photocatalytic activity of the as-prepared catalysts, Reactive Black 5 was used as a simulated organic pollutant in aqueous. The results revealed that uniform spherical nano-ZnO particles with a diameter of 10 nm were attached to the surface and mesopore of meso-SiO2. The average pore width and specific surface area of this composite were 7.06 nm and 305 m2.g-1, respectively. The optimal amount of loaded Ag and Cu were 3% and 0.1%, respectively, which resulted in around 100% removal of Reactive Black 5 after 280 min UV-light irradiation. The degradation process followed pseudo-first-order kinetics. Ag and Cu-loaded nano-ZnO/SiO2 could be advantageous for suppressing the recombination of photo-generated holes and electrons, thus improving the degradation efficiency. The constant of degradation rate and adsorption equilibrium of 3%Ag/0.1%Cu/nano-ZnO/meso-SiO2 were 0.049 min–1 and 2.14 L.g-1, respectively. After three reuses, the Ag/Cu/ZnO/meso-SiO2 photocatalyst remained very stable during the photocatalytic process with no loss of photocatalytic activity. According to the GC-MS results, a probable degradation mechanism was estimated.

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Li, Lin, Yi Li, Jia Shen Li, Lei Yao, Arthur F. T. Mak, Frank Ko, and Ling Qin. "Antibacterial and Nontoxic Nano Silver PLLA Composites for Tissue Engineering." Advanced Materials Research 47-50 (June 2008): 849–52. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.849.

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Poly-L-Lactide (PLLA) composites were prepared with nano silver particles with the weight ratios of nano silver particles to PLLA (Ag/PLLA) at 0.5%, 2.5%, 5%, 7.5% and 10% (w/w). In vitro cytotoxicity tests were conducted firstly to evaluate the cytotoxicity of the composites. The results indicated that PLLA, 0.5%, 2.5% and 5% Ag/PLLA composites were nontoxic to cells, while 7.5% and 10% Ag/PLLA composites were significantly toxic to cells. Cell proliferation experiments and antibacterial tests were also performed. 5% Ag/PLLA was found the best for cell proliferation with obvious antibacterial property. Thus, Ag/PLLA can be used as nontoxic scaffolds for tissue engineering with antibacterial property.

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Co, Thien Thanh, Khanh Kim Nguyen, and Hoang Van Nguyen. "SYNTHESIS OF NANO Ag CATALYST EMBEDED VANADIUM PHOSPHORUS OXIDE FOR OXIDATION OF STYRENE TO BENZALDEHYDE BY HYDROGEN PEROXIDE." Vietnam Journal of Science and Technology 58, no. 6 (December 15, 2020): 709. http://dx.doi.org/10.15625/2525-2518/58/6/15119.

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In this work, nano silver catalyst loaded on vanadium phosphorus oxide (Ag/VPO) for oxidation of styrene to benzaldehyde was synthesized by impregnating method including impregnating of VPO substrate with colloid solution of nano silvers. VPO substrate was prepared by microwave-assisted reaction of vanadium and phosphorus precursors. Meanwhile, nano Ag/PVP was prepared in solution using NaBH4 as reducing agent and polyvinylpyrrolidone (PVP) as protecting agent and spherical-shaped nano particles with mean diameter of about 7.5 nm determined by transmission electron microscopy (TEM) was obtained.

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Tseng, Kuo-Hsiung, Chih-Ju Chou, To-Cheng Liu, Der-Chi Tien, Chun Yung Chang, and Leszek Stobinski. "Relationship between Ag nanoparticles and Ag ions prepared by arc discharge method." Nanotechnology Reviews 7, no. 1 (February 23, 2018): 1–9. http://dx.doi.org/10.1515/ntrev-2017-0167.

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AbstractThis study used the submerged arc discharge method (SADM) to produce metal fluid containing nanoparticles and submicron particles, whereby the energy focused by an electric arc was used to disintegrate silver (Ag) metal in deionized water (DW). No additional chemical substances were required throughout the process, which enabled production to be fast and straightforward. This study proposed using colorimetry to define the interrelation between concentration and nano Ag as well as the Ag ions (Ag+) within a nano silver colloid (NSC) of a specific dilution factor, involving ultraviolet-visible (UV-Vis) spectroscopy and the measuring of electrical conductivity. The results showed that Ag+activity increased under various dilution conditions, displaying an upward trend in activity with an increase in the dilution factor. The absorption values of Ag+and nanoparticles increased over time, and the Ag+activity increased by up to a factor of two after its dilution. Therefore, the Ag+and nanoparticles demonstrated an interdependence between each other.

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Chen, Sihai, Guangyu Fan, Xue Yan, Chris LaBarbera, Lee Kresge, and Ning-Cheng Lee. "PRESSURELESS SINTERING OF NANO- AG PASTE WITH LOW POROSITY FOR DIE ATTACH." International Symposium on Microelectronics 2014, no. 1 (October 1, 2014): 000092–98. http://dx.doi.org/10.4071/isom-ta35.

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A novel nano-Ag sintering paste C has been developed for a pressureless sintering process under air. Paste C was sintered at 250°C (C1) and 280°C (C2), respectively; C1 showed a slightly higher porosity but higher shear strength after aging at 250°C for 840 hours. Both C1 and C2 exhibited a microstructure much more stable than the control solder 92.5Pb/5Sn/2.5Ag, which suffered both IMC spalling after thermal aging and voiding. Ag migration toward the DBC to form a dense layer of AgCuNi(Au) was observed for all nano-Ag pastes that were studied, with C1 and C2 being more moderate in the migration rate. The Ag migration could be attributed to the tendency of Ag to form an alloy with Au, with abundant Ni and Cu at the DBC side, and appeared to be affected by the chemistry of nano-Ag paste. A liquid to liquid thermal shock test from −45°C to 240°C was attempted, and was considered too harsh for the die/DBC system employed in this study.

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Sharma, Shikha, and Fehmeeda Khatoon. "Bio-Synthesis and Characterization of CS–Ag Nano Hydrogel for Antibacterial Application." Advanced Science, Engineering and Medicine 12, no. 4 (April 1, 2020): 542–47. http://dx.doi.org/10.1166/asem.2020.2543.

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An environmental technique of herbal mediated blend of Ag nanoparticles is a substantial stage in the ground of nanotechnology. Chitosan (CS) is a polymer which is biocompatible and antibacterial. In this work, we have synthesized CS–Ag Nano hydrogel which is form with chitosan-based hydrogel merged in the herbal synthesized Ag nanoparticles. These green synthesized Ag-nanoparticles made from Polygonum bistorta plant leaves and described with the assistance of UV-vis spectrophotometer, and Dynamic Light Scattering (DLS). In this work our main focus to synthesized CS–Ag Nano hydrogel. These hydrogel was described by Fourier transform infrared (FTIR) spectroscopic method, X-ray diffraction (XRD) method, and contact angle. Nanoparticle size distribution was within 1 to 100 nm by DLS and the optimum wavelength was noted in 400 to 450 nm by UV-vis spectroscopic readings. A good antibacterial behavior has been displayed by these synthesized CS–Ag Nano hydrogel films against both E. coli (gram –ve) and S. aureus (gram +ve) with the maximum 7 mm inhibition zone.

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Jacob, Jasmine, T. Augustine Arul Prasad, B. Scholastica Mary Vithiya, Bindhu Thomas, and R. Vasanthi. "Evaluation of Cu-Ag Bimetallic Nanoalloys as Antibacterial, Antidiabetic, Anticancerous Drug Biosynthesized from Curcuma aromatica." Asian Journal of Chemistry 34, no. 5 (2022): 1183–88. http://dx.doi.org/10.14233/ajchem.2022.23651.

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Drug resistant strains are formed due to unsuitable uses of antibiotics and insufficient check of infections. In present years, due to the extensive antimicrobial properties, metallic nanoparticles and metallo-pharmaceutics are highly proposed. Therefore, the synthesis of bimetallic nanoparticles are exploring towards the evolution of more productive amalgamative antimicrobials composed of combined metals. In this study, the green synthesis of Cu-Ag bimetallic nano-alloys using aqueous extract from the leaves of Curcuma aromatica is carried out. Synthesized Cu-Ag nano-alloys were characterized by UV-visible spectroscopy, scanning electron microscope (FE-SEM), transmission electron microscope (TEM-EDAX), cyclic voltammogram (CV). The characterization studies reveals that the biosynthesis produced core-shell Cu-Ag nano-alloys with spherical shape and average diameter size of 15 nm. The synthesized Cu-Ag nanoalloys exhibited antibacterial activity against both Gram-positive and Gram-negative bacteria. The antidiabetic potential of Cu-Ag nanoalloys shows an effective inhibition against α-glucosidase. Anticancerous activity of Cu-Ag nanoalloys indicates its greater efficacy in destroying cancer cells. The biosynthesis of Cu-Ag nanoalloys can be employed in medical and industrial fields on a large scale with cost reductive method.

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Jin, Zheng Wei, Jian Qing Wang, Shuo Wang, and Mei Xu. "Preparation of Cellulose/Ag⁺ Antibacterial Composites Films by NMMO-Technology." Advanced Materials Research 174 (December 2010): 458–61. http://dx.doi.org/10.4028/www.scientific.net/amr.174.458.

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By using hardwood pulp as natural cellulose resource, nano-TiO2/Ag+ and meso-SiO2/Ag+ as inorganic antibacterial agents, the cellulose/Ag+ antibacterial composites films were prepared to improve the elongation and antibacterial ability through NMMO-technology. The elongation at break of the cellulose composites films and the antibacterial ability on the Bacteria of S.aureus as a function of the content of the inorganic antibacterial agents were studied. The investigations suggest that the elongation at break of the cellulose composites films increases at first and then decreases, when the inorganic antibacterial agents’ concentration in the film increases. The elongation at break of the cellulose composites films reaches their maximums, which are improved to 69.8% and 64.1% for nano-TiO2/Ag+ and meso-SiO2/Ag+, respectively. With increasing concentration of the inorganic antibacterial agents, the antibacterial ability on the bacteria of S.aureus increases. It was also found that when the concentration of the inorganic antibacterial agents in the composites films was adjusted from 0.5 wt.% to 2.0 wt.%, the antibacterial abilities vary from 90.7% to 98.5% by incorporating nano-TiO2/Ag+ from 89.2% to 96.9% by incorporating meso-SiO2/Ag+, respectively.

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Kim, Joo-Young, Soo-In Kim, Kyu-Young Lee, Hyeong-Keun Kim, Jae-Hyeok Jun, Yun-Jong Jeong, Mu-Chan Kim, Jong-Rim Lee, and Chang-Woo Lee. "Nano-size Study of Surface-modified Ag Anode for OLEDs." Journal of the Korean Vacuum Society 21, no. 1 (January 30, 2012): 12–16. http://dx.doi.org/10.5757/jkvs.2012.21.1.12.

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Ahmad, Zahoor, Maryam Maqsood, Mazher Mehmood, Mirza Jameel Ahmad, and Muhammad Aziz Choudhary. "Synthesis and Characterization of Pure and Nano-Ag Impregnated Chitosan Beads and Determination of Catalytic Activities of Nano-Ag." Bulletin of Chemical Reaction Engineering & Catalysis 12, no. 1 (April 30, 2017): 127. http://dx.doi.org/10.9767/bcrec.12.1.860.127-135.

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The synthesis of nano-Ag impregnated porous Chitosan beads, in crosslinked and uncrosslinked forms, was aimed to investigate their catalytic potential in reducing nitro group into amino by NaBH4. The material was found unique concerning the synthesis of well-defined Ag NPs and subsequently adsorbing them on its surface. The crosslinked and uncrosslinked chitosan beads were separately analyzed for the loading of Ag and its effect over the microstructures of the substrate. BET was used to explore the porous nature and pore size distributions of beads. At each stage, SEM coupled with EDX, FT-IR, and inductively coupled plasma (ICP) were employed to characterize the material. The catalytic activities of nano-Ag in crosslinked and uncrosslinked beads were determined by the reduction of 4-Nitrophenol (4-NP) into 4-aminophenol (4-AP) by NaBH4; which is least effective for such reduction. The catalytic activities were monitored by UV-Vis spectrophotometer. The results demonstrated the nano-Ag as a reliable and active catalyst which made NaBH4 quite capable for the nitro reduction. Moreover, the catalytic activities of crosslinked chitosan substrate were found more reproducible as compared to the uncrosslinked substrate. Copyright © 2017 BCREC GROUP. All rights reservedReceived: 7th December 2016; Revised: 19th December 2016; Accepted: 21st December 2016How to Cite: Ahmad, Z., Maqsood, M., Mehmood, M., Ahmad, M.J., Choudhary, M.A. (2017). Synthesis and Characterization of Pure and Nano-Ag Impregnated Chitosan Beads and Determination of Catalytic Activities of Nano-Ag. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (1): 127-135 (doi:10.9767/bcrec.12.1.860.127-135)Permalink/DOI: http://dx.doi.org/10.9767/bcrec.12.1.860.127-135

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Dinh, Nguyen Nang, Lam Minh Long, Hoang Thi Thu, Huynh tran My Hoa, and Tran Quang Trung. "Synthesis and Characterization of Ag/PEDOT:PSS Films Used for NH\(_3\) Selective Sensing." Communications in Physics 26, no. 2 (September 12, 2016): 173. http://dx.doi.org/10.15625/0868-3166/26/2/8518.

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Nano-Ag/PEDOT-PSS films were prepared by spin-coating technique. SEM surface morphology, Raman spectra and gas sensing of methanol, humidity and NH3 were studied. The obtained results showed that the resistance of Ag/PEDOT:PSS sheets exposed to gases related to the generation of electrons from the gases adsorption that eliminated holes as the major carriers in PEDOT:PSS. For NH3 gas the largest change of the resistance of Ag/PEDOT:PSS was observed. The less sensitivity of humidity and ethanol sensing was explained due to less dedoping reaction between H2O and ethanol vapor with Ag/PEDOT:PSS, respectively. This suggests a potential application of the nano-Ag/PEDOT-PSS sensors for the selective monitoring NH3 gas in environment.

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Kim, Jae Myung, Su Yong Lee, Hyon Chol Kang, and Do Young Noh. "Direct nano-scale patterning of Ag films using hard X-ray induced oxidation." Journal of Synchrotron Radiation 22, no. 1 (January 1, 2015): 156–60. http://dx.doi.org/10.1107/s1600577514023534.

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The morphological change of silver nano-particles (AgNPs) exposed to an intense synchrotron X-ray beam was investigated for the purpose of direct nano-scale patterning of metal thin films. AgNPs irradiated by hard X-rays in oxygen ambient were oxidized and migrated out of the illuminated region. The observed X-ray induced oxidation was utilized to fabricate nano-scale metal line patterns using sectioned WSi2/Si multilayers as masks. Lines with a width as small as 21 nm were successfully fabricated on Ag films on silicon nitride. Au/Ag nano-lines were also fabricated using the proposed method.

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Sultan, Khalid Faisal, Hosham Salim Anead, and Ameer Abed Jaddoa. "Energetic and Exergetic Assessment of the Cooling Efficiency of Automobile Radiator Using Mono and Hybrid Nanofluids." International Journal of Heat and Technology 39, no. 4 (August 31, 2021): 1321–27. http://dx.doi.org/10.18280/ijht.390431.

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In this paper, for two separate half-breed Nano liquids, Ag (25nm) + refined water and Ag (50nm) + Zn (50nm)-refined water tentatively considered at the vehicle radiator, the execution of restricted convection. Four distinct cross-breed Nano liquid concentrations in the range of 2-6 vol %. The increase of half breed nanoparticles into the refined water as a base liquid was organized by percentage. Within the range of 20 l/min-60 l /min, the coolant flow rate is altered. Inside the warm trade, Crossover Nano coolants show colossal change compared to the refined water. Ag-refined water cross breed Nano liquid's warm exchange execution was found to be much better than Ag + Zn-refined water half breed Nano coolant. In addition, with the rise in the concentration of half breed nanoparticle and half breed Nano fluid velocity, the Nusselt number is found to expand. In the advancement of the warm exchange rate, Mono and hybrid nanofluid forms play a very important role in enhancing the heat transfer and refrigeration of car radiators. With an increase in concentration of half-breed nanoparticles for the primary form about 44 percent warm exchange transition, expansion of 6 vol percent crossover nanoparticles were achieved with the rate of warm exchange. In comparison to the current form of cross breed nanoparticles, with an expansion of 6 percent vol concentration, 22 percent extended. The exergy in flow, exergy destruction and exergy efficiency of mono nanofluid (Ag +Dw) are greater than hybrid nanofluid (Ag + Zn + Dw) and distilled water. The exergy inflow, exergy destruction, and exergy efficiency as the concentration of nanoparticles increases for the two forms of mono and hybrid nanofluid. The values parameters of the mono nanofluid (Ag + Dw) such as exergy in flow, exergy destruction and exergy efficiency at 6 vol% were 572 W, 460 W, 72% respectively while in hybrid nanofluids (Ag + Zn + Dw) were 420W, 282W, 51%. The use of mono and hybrid nanofluid as a working fluid results in higher efficiency of heat transfer, which promotes the performance of the car engine and decreases fuel consumption.

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Chavan, D. N., G. E. Patil, D. D. Kajale, V. B. Gaikwad, P. K. Khanna, and G. H. Jain. "Nano Ag-DopedIn2O3Thick Film: A Low-TemperatureH2SGas Sensor." Journal of Sensors 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/824215.

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Thick films of AR grade In2O3were prepared by standard screen-printing technique. The gas sensing performances of thick films were tested for various gases. It showed maximum sensitivity to ethanol vapour at 350°C for 80 ppm concentration. To improve the sensitivity and selectivity of the film towards a particular gas, In2O3sensors were surface-modified by dipping them in a solution of 2% nanosilver for different intervals of time. Obtained results indicated that spherical nano-Ag grains are highly dispersed on the surface of In2O3sensor. The surface area of the nano-Ag/ In2O3sensor is several times larger than that of pure In2O3sensor. In comparison with pure In2O3sensor, all of the nano-Ag-doped sensors showed better sensing performance in respect of response, selectivity, and optimum operating temperature. The surface-modified (30 min) In2O3sensor showed larger sensitivity to H2S gas (10 ppm) at 100°C. Nano silver on the surface of the film shifts the reactivity of film from ethanol vapour to H2S gas. A systematic study of gas sensing performance of the sensor indicates the key role played by the nano silver species on the surface. The sensitivity, selectivity, response, and recovery time of the sensor were measured and presented.

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Journal articles on the topic 'Nano-Ag'

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