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Articles de revues sur le sujet « Silver Nanoparticle Aggregates »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Wang, Wei, Manman Yang, Zongyuan Wang, Jinmao Yan et Changjun Liu. « Silver nanoparticle aggregates by room temperature electron reduction : preparation and characterization ». RSC Adv. 4, no 108 (2014) : 63079–84. http://dx.doi.org/10.1039/c4ra11803k.

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Bayram, Serene S., Klas Lindfors et Amy Szuchmacher Blum. « Tunable longitudinal modes in extended silver nanoparticle assemblies ». Beilstein Journal of Nanotechnology 7 (26 août 2016) : 1219–28. http://dx.doi.org/10.3762/bjnano.7.113.

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Nanostructured materials with tunable properties are of great interest for a wide range of applications. The self-assembly of simple nanoparticle building blocks could provide an inexpensive means to achieve this goal. Here, we generate extended anisotropic silver nanoparticle assemblies in solution using controlled amounts of one of three inexpensive, widely available, and environmentally benign short ditopic ligands: cysteamine, dithiothreitol and cysteine in aqueous solution. The self-assembly of our extended structures is enforced by hydrogen bonding. Varying the ligand concentration modulates the extent and density of these unprecedented anisotropic structures. Our results show a correlation between the chain nature of the assembly and the generation of spectral anisotropy. Deuterating the ligand further enhances the anisotropic signal by triggering more compact aggregates and reveals the importance of solvent interactions in assembly size and morphology. Spectral and morphological evolutions of the AgNPs assemblies are followed via UV–visible spectroscopy and transmission electron microscopy (TEM). Spectroscopic measurements are compared to calculations of the absorption spectra of randomly assembled silver chains and aggregates based on the discrete dipole approximation. The models support the experimental findings and reveal the importance of aggregate size and shape as well as particle polarizability in the plasmon coupling between nanoparticles.
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3

Heck, Christian, Yuya Kanehira, Janina Kneipp et Ilko Bald. « Amorphous Carbon Generation as a Photocatalytic Reaction on DNA-Assembled Gold and Silver Nanostructures ». Molecules 24, no 12 (24 juin 2019) : 2324. http://dx.doi.org/10.3390/molecules24122324.

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Background signals from in situ-formed amorphous carbon, despite not being fully understood, are known to be a common issue in few-molecule surface-enhanced Raman scattering (SERS). Here, discrete gold and silver nanoparticle aggregates assembled by DNA origami were used to study the conditions for the formation of amorphous carbon during SERS measurements. Gold and silver dimers were exposed to laser light of varied power densities and wavelengths. Amorphous carbon prevalently formed on silver aggregates and at high power densities. Time-resolved measurements enabled us to follow the formation of amorphous carbon. Silver nanolenses consisting of three differently-sized silver nanoparticles were used to follow the generation of amorphous carbon at the single-nanostructure level. This allowed observation of the many sharp peaks that constitute the broad amorphous carbon signal found in ensemble measurements. In conclusion, we highlight strategies to prevent amorphous carbon formation, especially for DNA-assembled SERS substrates.
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Chen, Shao-Feng, et Hongyin Zhang. « Stability and sedimentation of silver nanoparticles in the presence of monovalent, divalent and trivalent electrolyte solutions ». Water Science and Technology 70, no 2 (24 mai 2014) : 361–66. http://dx.doi.org/10.2166/wst.2014.238.

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The present study seeks to elucidate the effect of different electrolytes on the stability of citrate-coated silver nanoparticles synthesized by the reduction of the Ag(NH3)2+ complex via Tollens’ method. Time-resolved dynamic light scattering technique was used to measure the aggregation behavior of the nanoparticles over a range of electrolyte (NaCl, CaCl2, and AlCl3) concentrations. From the aggregation kinetic data, the critical coagulation concentration values were calculated as 0.11, 1.7 × 10−3, and 5.06 × 10−6M for NaCl, CaCl2, and AlCl3, respectively. Supernatant of the nanoparticle suspension in presence of the three electrolytes was collected and measured using inductively coupled plasma mass spectrometry to quantify the sedimentation. It was found that the silver nanoparticle aggregates settled rapidly in the slow aggregation and fast aggregation regimes. Their sedimentation followed a nanoparticle size-dependent manner.
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Diehn, Sabrina, Helmut Schlaad et Janina Kneipp. « Multivariate Imaging for Fast Evaluation of In Situ Dark Field Microscopy Hyperspectral Data ». Molecules 27, no 16 (12 août 2022) : 5146. http://dx.doi.org/10.3390/molecules27165146.

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Dark field scattering microscopy can create large hyperspectral data sets that contain a wealth of information on the properties and the molecular environment of noble metal nanoparticles. For a quick screening of samples of microscopic dimensions that contain many different types of plasmonic nanostructures, we propose a multivariate analysis of data sets of thousands to several hundreds of thousands of scattering spectra. By using non-negative matrix factorization for decomposing the spectra, components are identified that represent individual plasmon resonances and relative contributions of these resonances to particular microscopic focal volumes in the mapping data sets. Using data from silver and gold nanoparticles in the presence of different molecules, including gold nanoparticle-protein agglomerates or silver nanoparticles forming aggregates in the presence of acrylamide, plasmonic properties are observed that differ from those of the original nanoparticles. For the case of acrylamide, we show that the plasmon resonances of the silver nanoparticles are ideally suited to support surface enhanced Raman scattering (SERS) and the two-photon excited process of surface enhanced hyper Raman scattering (SEHRS). Both vibrational tools give complementary information on the in situ formed polyacrylamide and the molecular composition at the nanoparticle surface.
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6

Quadrini, Fabrizio, Denise Bellisario, Loredana Santo et Giovanni Matteo Tedde. « Anti-Bacterial Nanocomposites by Silver Nano-Coating Fragmentation ». Materials Science Forum 879 (novembre 2016) : 1540–45. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1540.

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Silver nanocomposites are of great interest for several fields, ranging from packaging to biomedical applications, because of their known antibacterial properties. However, their use is strongly limited by technological issues: synthesis methods of silver nanoparticles are still difficult to control in terms of size, shape and aggregation. Moreover separation of nanoparticle aggregates should occur during part manufacturing by mixing with the polymer base but this process is also troublesome. In the present study, a new process to fabricate silver nanocomposites with antibacterial properties is presented. Silver nanofilms are deposited by radio frequency (RF) sputtering on polypropylene (PP) substrates. Consequently PP coated substrates are cut and inserted in a small-scale polymer mixer to produce the nanocomposite in a single step, without the need of producing nanoparticles. In fact, nanoparticles originate by the fragmentation of the nanocoating. Microscopic observations of nanocomposites revealed silver nanoclusters of different sizes. Their antibacterial activity has been verified in accordance to ISO 22196. The antibacterial activity of the nanocomposite was detected for the Escherichia coli and Staphylococcus aureus bacteria.
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7

Murthy, Jsr, Venkata Kumar T et Narayana Rao V. « COUROUPITA GUIANENSIS LEAF CALLUS EXTRACT MEDIATED SYNTHESIS AND ANTIBACTERIAL ACTIVITY OF SILVER NANOPARTICLES. » Asian Journal of Pharmaceutical and Clinical Research 10, no 5 (1 mai 2017) : 126. http://dx.doi.org/10.22159/ajpcr.2017.v10i5.17066.

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Objective: Synthesis of varied sized and morphologically distinct silver nanoparticles (AgNPs) using callus/callus extract, and their promising antibacterial and cytotoxicity was reported from very few plant systems. Here, we investigated silver nanoparticle synthetic potential of Couroupita guianensis leaf callus extract and their antibacterial activity.Methods: synthesis of callus mediated silver nanoparticles and characterisation of physical, chemical, and antibacterial activity of AgNPs.Results: Callus extract rapidly reduced silver ions and stabilized nanoparticles have displayed characteristic maximum UV absorbance at 410 nm. SEM and AFM images revealed their spherical morphology and size variation, which is ranged from 30.38 nm to 88.32 nm and were in small aggregates. Capping of AgNPs by the phenolic compounds and proteins revealed from FTIR spectral peaks. Silver nanoparticles displayed significantly high antimicrobial activity against both Gram positive and negative bacterial strains compared to silver ions and gentamicin. This enhanced antimicrobial activity of AgNPs may due their small size leading to efficient molecular contact with cell surface, and uptake and interaction with vital biomolecules.Conclusions: Stable AgNPs were synthesized through reduction and capping of silver ions by polyphenols and proteins present in callus extract. Theenhanced antimicrobial activity of AgNPs may due to their small size leading to efficient molecular contact with the cell surface, penetration, andinteraction, and inactivation of vital biomolecules.KEY WORDS: Couroupita guianensis, callus extract, Silver nanoparticles (AgNPs), antibacterial activity
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Kim, Hyunmin, Eunjoo Kim, Eunsook Choi, Chul Su Baek, Bokyung Song, Chang-Hee Cho et Sang Won Jeong. « Label-free C-reactive protein SERS detection with silver nanoparticle aggregates ». RSC Advances 5, no 44 (2015) : 34720–29. http://dx.doi.org/10.1039/c5ra00040h.

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Gill, Ron, Lijin Tian, Walter R. C. Somerville, Eric C. Le Ru, Herbert van Amerongen et Vinod Subramaniam. « Silver Nanoparticle Aggregates as Highly Efficient Plasmonic Antennas for Fluorescence Enhancement ». Journal of Physical Chemistry C 116, no 31 (août 2012) : 16687–93. http://dx.doi.org/10.1021/jp305720q.

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Gill, Ron, Lijin Tian, Herbert van Amerongen et Vinod Subramaniam. « Emission enhancement and lifetime modification of phosphorescence on silver nanoparticle aggregates ». Physical Chemistry Chemical Physics 15, no 38 (2013) : 15734. http://dx.doi.org/10.1039/c3cp50407g.

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11

Li, Hui, Ziyin Sun, Wenying Zhong, Nan Hao, Danke Xu et Hong-Yuan Chen. « Ultrasensitive Electrochemical Detection For DNA Arrays Based on Silver Nanoparticle Aggregates ». Analytical Chemistry 82, no 13 (juillet 2010) : 5477–83. http://dx.doi.org/10.1021/ac101193e.

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Furtaw, Michael D., Jon P. Anderson, Lyle R. Middendorf et Gregory R. Bashford. « Near-Infrared, Surface-Enhanced Fluorescence Using Silver Nanoparticle Aggregates in Solution ». Plasmonics 9, no 1 (7 juillet 2013) : 27–34. http://dx.doi.org/10.1007/s11468-013-9594-y.

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Csete, Mária, Anikó Szalai, Edit Csapó, László Tóth, Anikó Somogyi et Imre Dékány. « Collective Plasmonic Resonances on Arrays of Cysteine-Functionalized Silver Nanoparticle Aggregates ». Journal of Physical Chemistry C 118, no 31 (25 juillet 2014) : 17940–55. http://dx.doi.org/10.1021/jp503465r.

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Wypij, Magdalena, Magdalena Świecimska, Hanna Dahm, Mahendra Rai et Patrycja Golinska. « Controllable biosynthesis of silver nanoparticles using actinobacterial strains ». Green Processing and Synthesis 8, no 1 (28 janvier 2019) : 207–14. http://dx.doi.org/10.1515/gps-2018-0070.

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Abstract We report the effect of various parameters, namely substrate concentration, time, pH and temperature, on the biosynthesis of silver nanoparticles (AgNPs) by using the extract of actinobacterial strains, which were isolated from the sediments of Lonar Crater Lake in India. It was found that the formation of AgNPs and its morphology depended on synthesis conditions. Visual observation of the reaction mixture, ultraviolet-vis spectroscopic analysis and mass of synthesized AgNPs indicated that 25°C, pH 7 and 3 days of incubation time were optimal for its efficient synthesis. The transmission electron microscopy (TEM) analysis revealed aggregation and irregular shape of AgNPs both at acidic pH and below 25°C. It was found that alkaline pH and temperature higher than optimal fostered the formation of nanoparticle aggregates. Based on the obtained results, it was concluded that the efficiency of biological synthesis by using actinobacteria as well as the size and shape of fabricated nanoparticles can be manipulated by controlled conditions of synthesis process. The use of desired nanoparticles increases its potential for medical applications.
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15

Liu, Cuicui, Xiaoli Zhang, Limei Li, Jingcheng Cui, Yu-e. Shi, Le Wang et Jinhua Zhan. « Silver nanoparticle aggregates on metal fibers for solid phase microextraction–surface enhanced Raman spectroscopy detection of polycyclic aromatic hydrocarbons ». Analyst 140, no 13 (2015) : 4668–75. http://dx.doi.org/10.1039/c5an00590f.

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Sun, Lanlan, Dongxu Zhao, Meng Ding, ZhiKun Xu, Zhenzhong Zhang, Binghui Li et Dezhen Shen. « Controllable Synthesis of Silver Nanoparticle Aggregates for Surface-Enhanced Raman Scattering Studies ». Journal of Physical Chemistry C 115, no 33 (25 août 2011) : 16295–304. http://dx.doi.org/10.1021/jp205545g.

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Fu, Yunsheng, Xianglei Yu, Li Liu, Xianjie Tang, Junpeng Li et Guoyou Gan. « Study on Low-Temperature Conductive Silver Pastes Containing Bi-Based Glass for MgTiO3 Electronic Power Devices ». Micromachines 14, no 9 (25 août 2023) : 1663. http://dx.doi.org/10.3390/mi14091663.

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Low-temperature lead-free silver pastes deserve thorough investigation for sustainable development and application of MgTiO3 ceramics in electronic devices. In this study, a series of Bi2O3-B2O3-ZnO-SiO2-Al2O3-CaO glasses with suitable softening temperatures were prepared via melt quenching using a type of micrometer silver powder formed by silver nanoparticle aggregates. The composite pastes containing silver powder, Bi2O3 glass powder and an organic vehicle were then screen-printed. The effects of glass powder concentration and sintering temperature on the microstructure of the surface interface were also investigated. The results showed that the silver paste for microwave dielectric ceramic filters (MgTiO3) possessed good electrical conductivity (2.28 mΩ/□) and high adhesion (43.46 N/mm2) after medium temperature (670 °C) sintering. Thus, this glass powder has great application potential in non-toxic lead-free silver pastes for metallization of MgTiO3 substrates.
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18

Gouyau, Jimmy, Raphaël E. Duval, Ariane Boudier et Emmanuel Lamouroux. « Investigation of Nanoparticle Metallic Core Antibacterial Activity : Gold and Silver Nanoparticles against Escherichia coli and Staphylococcus aureus ». International Journal of Molecular Sciences 22, no 4 (14 février 2021) : 1905. http://dx.doi.org/10.3390/ijms22041905.

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Multidrug-resistant (MDR) bacteria constitute a global health issue. Over the past ten years, interest in nanoparticles, particularly metallic ones, has grown as potential antibacterial candidates. However, as there is no consensus about the procedure to characterize the metallic nanoparticles (MNPs; i.e., metallic aggregates) and evaluate their antibacterial activity, it is impossible to conclude about their real effectiveness as a new antibacterial agent. To give part of the answer to this question, 12 nm gold and silver nanoparticles have been prepared by a chemical approach. After their characterization by transmission electronic microscopy (TEM), Dynamic Light Scattering (DLS), and UltraViolet-visible (UV-vis) spectroscopy, their surface accessibility was tested through the catalytic reduction of the 4-nitrophenol, and their stability in bacterial culture medium was studied. Finally, the antibacterial activities of 12 nm gold and silver nanoparticles facing Staphylococcus aureus and Escherichia coli have been evaluated using the broth microdilution method. The results show that gold nanoparticles have a weak antibacterial activity (i.e., slight inhibition of bacterial growth) against the two bacteria tested. In contrast, silver nanoparticles have no activity on S. aureus but demonstrate a high antibacterial activity against Escherichia coli, with a minimum inhibitory concentration of 128 µmol/L. This high antibacterial activity is also maintained against two MDR-E. coli strains.
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Zhang, Zhiliang, et Yongqiang Wen. « Controllable aggregates of silver nanoparticle induced by methanol for surface-enhanced Raman scattering ». Applied Physics Letters 101, no 17 (22 octobre 2012) : 173109. http://dx.doi.org/10.1063/1.4764024.

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Szalai, Anikó, Áron Sipos, Edit Csapó, László Tóth, Mária Csete et Imre Dékány. « Comparative Study of Plasmonic Properties of Cysteine-Functionalized Gold and Silver Nanoparticle Aggregates ». Plasmonics 8, no 1 (23 août 2012) : 53–62. http://dx.doi.org/10.1007/s11468-012-9420-y.

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Lizoń, Anna, Magdalena Wytrwal-Sarna, Marta Gajewska et Ryszard Drożdż. « Silver Nanoparticle-Based Assay for the Detection of Immunoglobulin Free Light Chains ». Materials 12, no 18 (15 septembre 2019) : 2981. http://dx.doi.org/10.3390/ma12182981.

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There is a wide spectrum of malignant diseases that are connected with the clonal proliferation of plasma cells, which cause the production of complete immunoglobulins or their fragments (heavy or light immunoglobulin chains). These proteins may accumulate in tissues, leading to end organ damage. The quantitative determination of immunoglobulin free light chains (FLCs) is considered to be the gold standard in the detection and treatment of multiple myeloma (MM) and amyloid light-chain (AL) amyloidosis. In this study, a silver nanoparticle-based diagnostic tool for the quantitation of FLCs is presented. The optimal test conditions were achieved when a metal nanoparticle (MNP) was covered with 10 particles of an antibody and conjugated by 5–50 protein antigen particles (FLCs). The formation of the second antigen protein corona was accompanied by noticeable changes in the surface plasmon resonance spectra of the silver nanoparticles (AgNPs), which coincided with an increase of the hydrodynamic diameter and increase in the zeta potential, as demonstrated by dynamic light scattering (DLS). A decrease of repulsion forces and the formation of antigen–antibody bridges resulted in the agglutination of AgNPs, as demonstrated by transmission electron microscopy and the direct formation of AgNP aggregates. Antigen-conjugated AgNPs clusters were also found by direct observation using green laser light scattering. The parameters of the specific immunochemical aggregation process consistent with the sizes of AgNPs and the protein particles that coat them were confirmed by four physical methods, yielding complementary data concerning a clinically useful AgNPs aggregation test.
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Huang, Ying-Ying, Sulbha K. Sharma, Tianhong Dai, Hoon Chung, Anastasia Yaroslavsky, Maria Garcia-Diaz, Julie Chang, Long Y. Chiang et Michael R. Hamblin. « Can nanotechnology potentiate photodynamic therapy ? » Nanotechnology Reviews 1, no 2 (1 mars 2012) : 111–46. http://dx.doi.org/10.1515/ntrev-2011-0005.

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AbstractPhotodynamic therapy (PDT) uses the combination of nontoxic dyes and harmless visible light to produce reactive oxygen species that can kill cancer cells and infectious microorganisms. Due to the tendency of most photosensitizers (PS) to be poorly soluble and to form nonphotoactive aggregates, drug-delivery vehicles have become of high importance. The nanotechnology revolution has provided many examples of nanoscale drug-delivery platforms that have been applied to PDT. These include liposomes, lipoplexes, nanoemulsions, micelles, polymer nanoparticles (degradable and nondegradable), and silica nanoparticles. In some cases (fullerenes and quantum dots), the actual nanoparticle itself is the PS. Targeting ligands such as antibodies and peptides can be used to increase specificity. Gold and silver nanoparticles can provide plasmonic enhancement of PDT. Two-photon excitation or optical upconversion can be used instead of one-photon excitation to increase tissue penetration at longer wavelengths. Finally, after sections on in vivo studies and nanotoxicology, we attempt to answer the title question, “can nanotechnology potentiate PDT?”
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Liu, Yun, Xiao-lan Wang, Meng-qing Wei, Hui Wang, Yu-peng Tian, Sheng-li Li, Zhao-ming Xue, Jia-xiang Yang et Lin Kong. « Enhanced two-photon absorption property of silver nanoparticle aggregates induced by a thioether derivative ». Optical Materials 62 (décembre 2016) : 485–93. http://dx.doi.org/10.1016/j.optmat.2016.10.029.

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Ewald, M., JM Gunn et M. Dantus. « Two-Photon Induced Emission From Silver Nanoparticle Aggregates on Thin Films and in Solution ». Microscopy and Microanalysis 12, S02 (31 juillet 2006) : 632–33. http://dx.doi.org/10.1017/s1431927606067195.

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Kim, Joon Heon, Jung Su Park et Min-Gon Kim. « Time-dependent change of Hyper-Rayleigh Scattering from silver nanoparticle aggregates induced by salt ». Chemical Physics Letters 600 (avril 2014) : 15–20. http://dx.doi.org/10.1016/j.cplett.2014.03.055.

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Cong, Yang, Jun Fu, Zexin Zhang, Ziyong Cheng, Rubo Xing, Jian Li et Yanchun Han. « Fabrication of arrays of silver nanoparticle aggregates by microcontact printing and block copolymer nanoreactors ». Journal of Applied Polymer Science 100, no 4 (2006) : 2737–43. http://dx.doi.org/10.1002/app.23063.

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Xu, Teng, et Virginia A. Davis. « Rheology and Shear-Induced Textures of Silver Nanowire Lyotropic Liquid Crystals ». Journal of Nanomaterials 2015 (2015) : 1–9. http://dx.doi.org/10.1155/2015/939587.

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We report the rheological and microstructural shear response of a mixture of polyvinylpyrrolidone (PVP) coated silver nanowires and nanoparticle aggregates (Ag) dispersed in ethylene glycol (EG) or water (H2O). Biphasic and liquid crystalline dispersions exhibited rheological characteristics similar to those of lyotropic liquid crystalline polymers (LCPs). The viscosity versus concentration curve for Ag-EG dispersions showed a viscosity minimum at a silver concentration between 2.2 vol.% and 2.9 vol.%; this is indicative of the transition to an entirely liquid crystalline phase. The rheology results were consistent with optical microscopy observations that at 2.9 vol.% the sample was entirely birefringent; this is another indication of liquid crystalline phase formation. Shear had a significant effect on the microstructure of the dispersions and dried coatings. Depending on the shear rate, worm or shear banding Structures were observed.
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Karvonen, L., Y. Chen, A. Säynätjoki, K. Taiviola, A. Tervonen et S. Honkanen. « SERS-active silver nanoparticle aggregates produced in high-iron float glass by ion exchange process ». Optical Materials 34, no 1 (novembre 2011) : 1–5. http://dx.doi.org/10.1016/j.optmat.2011.06.021.

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Kim, Hyun-A., Byung-Tae Lee, So-Young Na, Kyoung-Woong Kim, James F. Ranville, Soon-Oh Kim, Eunhye Jo et Ig-Chun Eom. « Characterization of silver nanoparticle aggregates using single particle-inductively coupled plasma-mass spectrometry (spICP-MS) ». Chemosphere 171 (mars 2017) : 468–75. http://dx.doi.org/10.1016/j.chemosphere.2016.12.063.

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Sardar, Subrata, Md Anas, Sanhita Maity, Sampa Pal, Hasan Parvej, Shahnaz Begum, Ramkrishna Dalui, Nayim Sepay et Umesh Chandra Halder. « Silver nanoparticle modulates the aggregation of beta-lactoglobulin and induces to form rod-like aggregates ». International Journal of Biological Macromolecules 125 (mars 2019) : 596–604. http://dx.doi.org/10.1016/j.ijbiomac.2018.12.039.

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Sun, Lili, Changshun Wang, Yujia Pan, Tianyu Chen et Ziyao Lv. « Enhanced trans‐to‐cis photoisomerization quantum yield of azobenzene spatially confined in silver nanoparticle aggregates ». Journal of Raman Spectroscopy 51, no 5 (5 février 2020) : 756–63. http://dx.doi.org/10.1002/jrs.5847.

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Jiang, Xiaohong, Min Yang, Yanjing Meng, Wei Jiang et Jinhua Zhan. « Cysteamine-Modified Silver Nanoparticle Aggregates for Quantitative SERS Sensing of Pentachlorophenol with a Portable Raman Spectrometer ». ACS Applied Materials & ; Interfaces 5, no 15 (16 juillet 2013) : 6902–8. http://dx.doi.org/10.1021/am401718p.

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Barbara, Aude, Fabien Dubois, Alain Ibanez, Lukas M. Eng et Pascal Quémerais. « SERS Correlation Spectroscopy of Silver Aggregates in Colloidal Suspension : Quantitative Sizing Down to a Single Nanoparticle ». Journal of Physical Chemistry C 118, no 31 (18 juillet 2014) : 17922–31. http://dx.doi.org/10.1021/jp5024444.

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Olson, Jacob E., Adam S. Braegelman, Lei Zou, Matthew J. Webber et Jon P. Camden. « Capture of Phenylalanine and Phenylalanine-Terminated Peptides Using a Supramolecular Macrocycle for Surface-Enhanced Raman Scattering Detection ». Applied Spectroscopy 74, no 11 (8 octobre 2020) : 1374–83. http://dx.doi.org/10.1177/0003702820937333.

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The cucurbit[n]uril (CB[ n]) family of macrocycles are known to bind a variety of small molecules with high affinity. These motifs thus have promise in an ever-growing list of trace detection methods. Surface-enhanced Raman scattering (SERS) detection schemes employing CB[ n] motifs exhibit increased sensitivity due to selective concentration of the analyte at the nanoparticle surface, coupled with the ability of CB[ n] to facilitate the formation of well-defined electromagnetic hot spots. Herein, we report a CB[7] SERS assay for quantification of phenylalanine (Phe) and further demonstrate its utility for detecting peptides with an N-terminal Phe. The CB[7]–guest interaction improves the sensitivity 5–25-fold over direct detection of Phe using citrate-capped silver nanoparticle aggregates, enabling use of a portable Raman system. We further illustrate detection of insulin via binding of CB[7] to the N-terminal Phe residue on its B-chain, suggesting a general strategy for detecting Phe-terminated peptides of clinically relevant biomolecules.
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Merkl, Padryk, Shuzhi Zhou, Apostolos Zaganiaris, Mariam Shahata, Athina Eleftheraki, Thomas Thersleff et Georgios A. Sotiriou. « Plasmonic Coupling in Silver Nanoparticle Aggregates and Their Polymer Composite Films for Near-Infrared Photothermal Biofilm Eradication ». ACS Applied Nano Materials 4, no 5 (5 mai 2021) : 5330–39. http://dx.doi.org/10.1021/acsanm.1c00668.

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Pilot, Roberto, et Michele Massari. « Silver nanoparticle aggregates : Wavelength dependence of their SERS properties in the first transparency window of biological tissues ». Chemical Physics Impact 2 (juin 2021) : 100014. http://dx.doi.org/10.1016/j.chphi.2021.100014.

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Karpov, S. V., V. S. Gerasimov, A. S. Grachev, I. L. Isaev, O. P. Podavalova et V. V. Slabko. « Experimental manifestations of the correlation between the local structure of silver nanoparticle aggregates and their absorption spectra ». Colloid Journal 69, no 2 (avril 2007) : 170–79. http://dx.doi.org/10.1134/s1061933x07020056.

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Sun, Lanlan, Yonghai Song, Li Wang, Cunlan Guo, Yujing Sun, Zhelin Liu et Zhuang Li. « Ethanol-Induced Formation of Silver Nanoparticle Aggregates for Highly Active SERS Substrates and Application in DNA Detection ». Journal of Physical Chemistry C 112, no 5 (février 2008) : 1415–22. http://dx.doi.org/10.1021/jp075550z.

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Xia, Ning, Lin Liu, Yong Chang, Yuanqiang Hao et Xiaojin Wang. « 4-Mercaptophenylboronic acid-induced in situ formation of silver nanoparticle aggregates as labels on an electrode surface ». Electrochemistry Communications 74 (janvier 2017) : 28–32. http://dx.doi.org/10.1016/j.elecom.2016.11.013.

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Talekar, Sachin, Gandhali Joshi, Radhika Chougle, Basavaraj Nainegali, Shashikant Desai, Asavari Joshi, Shashikant Kambale et al. « Preparation of stable cross-linked enzyme aggregates (CLEAs) of NADH-dependent nitrate reductase and its use for silver nanoparticle synthesis from silver nitrate ». Catalysis Communications 53 (août 2014) : 62–66. http://dx.doi.org/10.1016/j.catcom.2014.05.003.

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Azadikhah, Dariush, Ahmad Mohamadi Yalsuyi, Shubhajit Saha, Nimai Chandra Saha et Caterina Faggio. « Biochemical and Pathophysiological Responses in Capoeta capoeta under Lethal and Sub-Lethal Exposures of Silver Nanoparticles ». Water 15, no 3 (2 février 2023) : 585. http://dx.doi.org/10.3390/w15030585.

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The increasing use of nano-based products raises concerns regarding potential risks related to their manufacturing, transportation, waste disposal, and management operations. We used the riverine carp, Capoeta capoeta, as an aquatic animal model to demonstrate the acute toxicity of silver nanoparticles (Ag-NPs). This study focuses on acute toxicity first, and then integrates the findings through histopathology, hematological, and biochemical testing of lethal and sub-lethal Ag-NPs exposures. Red blood corpuscles (RBC), white blood corpuscles (WBC), hematocrit, and total serum glucose levels were significantly lower in Ag-NPs-exposed fish than in control fish. Total serum protein, triglycerides, cholesterol, and albumin were all significantly greater in exposed fish. This research focused on the impacts of Ag-NPs on gills and liver tissue, and it was found that the level of injury escalated as the concentration of Ag NPs increased. Epithelial lifting of secondary lamellas (ELSL), epithelial hypertrophy (EH) of secondary lamellae (SL), leukocyte infiltration (LI), and bottom hyperplasia (BH) were all detected in Ag-NPs-exposed fish. In Ag-NPs-treated liver cross-sections of Capoeta capoeta, macrophage aggregates (MA), fatty liver (FL), sinusoid dilatation (SD), and necrosis (N) were identified. Ag-NPs dosages, according to biomarker representations, elicit stress-specific biochemical and physiological effects, compromising the general overall health status of aquatic animals. The gradients of toxic responses across exposure concentrations and portrayals of disrupted fish health with increasing silver nanoparticle exposure time indicate a reduced physiological ability for surviving in the wild.
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Jiang, Jiachao, Xin Wang, Yuanyuan Zhang, Jiageng Zhang, Xiujun Gu, Shilong He, Shuo Duan, Jianli Ma, Lizhang Wang et Ping Luo. « The Aggregation and Dissolution of Citrate−Coated AgNPs in High Ammonia Nitrogen Wastewater and Sludge from UASB−Anammox Reactor ». International Journal of Environmental Research and Public Health 19, no 15 (2 août 2022) : 9502. http://dx.doi.org/10.3390/ijerph19159502.

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Silver nanoparticles (AgNPs) are released into the sewage pipes and ultimately wastewater treatment plants during manufacturing, use, and end–life disposal. AgNPs in wastewater treatment plants aggregate or dissolve, and may affect the microbial community and subsequent pollutant removal efficiency. This study aims to quantitatively investigate the fate of AgNPs in synthetic high ammonia nitrogen wastewater (SW) and sludge from an up–flow anaerobic sludge blanket (UASB) anammox reactor using a nanoparticle tracking analysis (NTA), dynamic light scattering (DLS), transmission electron microscope (TEM), and atomic absorption spectroscopy (AAS). Results showed that 18.1 mM NH4+, 2.11 mM Mg2+ in SW caused less negative zeta potential (ζ−potential, −18.4 vs. −37.4 mV), aggregation (388.8 vs. 21.5 nm), and settlement (80%) of citrate−coated AgNPs (cit−AgNPs) in 220 min. The presence of 18.5 mM Cl− in SW formed AgCl2−, AgCl(aq) and eventually promoted the dissolution (9.3%) of cit−AgNPs. Further exposure of SW−diluted AgNPs to sludge (42 mg L−1 humic acid) and induced a more negative ζ−potential (−22.2 vs. −18.4 mV) and smaller aggregates (313.4 vs. 388.8 nm) due to the steric and hindrance effect. The promoted Ag dissolution (34.4% vs. 9.3%) was also observed after the addition of sludge and the possible reason may be the production of Ag(NH3)2+ by the coexistence of HA from sludge and NH4+ from SW. These findings on the fate of AgNPs can be used to explain why AgNPs had limited effects on the sludge−retained bacteria which are responsible for the anammox process.
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Jin, Furui, Hui Li et Danke Xu. « Enzyme-free fluorescence microarray for determination of hepatitis B virus DNA based on silver nanoparticle aggregates-assisted signal amplification ». Analytica Chimica Acta 1077 (octobre 2019) : 297–304. http://dx.doi.org/10.1016/j.aca.2019.05.066.

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Jiang, Xiaohong, Yongchao Lai, Min Yang, Heng Yang, Wei Jiang et Jinhua Zhan. « Silver nanoparticle aggregates on copper foil for reliable quantitative SERS analysis of polycyclic aromatic hydrocarbons with a portable Raman spectrometer ». Analyst 137, no 17 (2012) : 3995. http://dx.doi.org/10.1039/c2an35713e.

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Kirstein, Stefan, Hans von Berlepsch et Christoph Böttcher. « Photo-induced reduction of Noble metal ions to metal nanoparticles on tubular J-aggregates ». International Journal of Photoenergy 2006 (2006) : 1–7. http://dx.doi.org/10.1155/ijp/2006/47917.

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Palladium and silver nanoparticles are formed on the surface of tubular J-aggregates of an amphiphilic tetrachlorobenzimidacarbocyanine dye by reduction of the respective metal cations in aqueous solution. Upon addition of the palladium complex Na2PdCl4to the aggregate solution, the absorption spectrum shows significant changes which is explained by partial destruction of the aggregates. Cryogenic transmission electron microscopy (cryo-TEM) images show that the tubular J-aggregates are randomly covered by well-separated Pd nanoparticles of approximately 1–3 nm size. Larger particles and higher particle density along the aggregates are obtained when an auxiliary reducing agent is added to the solution. The presence of the metallic particles leads to efficient fluorescence quenching giving clear evidence for super quenching. In similar experiments using AgNO3, silver nanoparticles are grown which are larger in size but less dense distributed along the aggregates. At least in the case of the silver particles, the spontaneous formation of metal nanoparticles is assumed to be initiated by a photo-induced electron transfer process (PET).
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Abdelmoneim, Dina, Gemma Porter, Warwick Duncan, Khoon Lim, Richard Easingwood, Tim Woodfield et Dawn Coates. « Three-Dimensional Evaluation of the Cytotoxicity and Antibacterial Properties of Alpha Lipoic Acid-Capped Silver Nanoparticle Constructs for Oral Applications ». Nanomaterials 13, no 4 (12 février 2023) : 705. http://dx.doi.org/10.3390/nano13040705.

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There is a need to develop bifunctional scaffolds that provide antibacterial protection while encouraging host cell attachment/proliferation. This study evaluates HyStem®-C, and photo-cross-linked GelMA hydrogels for encapsulation and stabilisation of silver nanoparticles (AgNPs). We studied the behaviour of AgNPs and matrix interactions within both hydrogel systems. The cell viability of encapsulated human gingival fibroblasts (HGFs) was determined by Prestoblue® assay and live/dead staining. The release of AgNPs was monitored by inductively coupled plasma–mass spectroscopy. The antibacterial properties of the GelMA-AgNP constructs were determined using disc diffusion. Even distribution of AgNPs in GelMA induced a significant decrease in cell viability (p < 0.0001), whereas AgNP aggregates did not induce cytotoxicity in HyStem®-C. AgNPs doses ≥ 0.5 µg/mL in GelMA were significantly toxic to the HGFs (p < 0.0001). The release of AgNPs from GelMA after 48 h was 20% w/w for 0.1 µg/mL and 51% for 100 µg/mL of AgNPs. At ≥5 µg/mL, a significant intra-construct bactericidal effect was observed. The disc diffusion assay shows that GelMA-incorporated AgNPs were found to be effective against both Escherichia coli and Staphylococcus aureus at 50 and 100 µg/mL, respectively. Visible photo-cross-linked GelMA stably incorporated AgNPs to provide an antimicrobial regenerative construct for oral applications.
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Li, Xiaoyue, Xiaotong Wang, Jiaxin Liu, Miaomiao Dai, Qianjun Zhang, Yang Li et Jian-An Huang. « Surface-enhanced Raman spectroscopy detection of organic molecules and in situ monitoring of organic reactions by ion-induced silver nanoparticle clusters ». Physical Chemistry Chemical Physics 24, no 5 (2022) : 2826–31. http://dx.doi.org/10.1039/d1cp04857k.

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In this work, we approach the problems by introducing calcium ions to aggregate silver nanoparticles to form stable hot spots and acetone to promote uniform distribution of organic molecules on the nanoparticle surface.
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Setua, Palash, Rajib Pramanik, Souravi Sarkar, Chiranjib Ghatak, S. K. Das et Nilmoni Sarkar. « Synthesis of Silver Nanoparticle Inside the Nonaqueous Ethylene Glycol Reverse Micelle and a Comparative Study to Show the Effect of the Nanoparticle on the Reverse Micellar Aggregates through Solvation Dynamics and Rotational Relaxation Measurements ». Journal of Physical Chemistry B 114, no 22 (10 juin 2010) : 7557–64. http://dx.doi.org/10.1021/jp1008048.

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Neimash, V. B., H. D. Kupianskyi, I. V. Olkhovyk, V. I. Styopkin, P. M. Lytvynchuk, V. Yu Povarchuk, I. S. Roguts’kyi, Yu A. Furmanov et S. M. Titarenko. « Formation of Silver Nanoparticles in PVA-PEG Hydrogel under Electron Irradiation ». Ukrainian Journal of Physics 64, no 1 (30 janvier 2019) : 41. http://dx.doi.org/10.15407/ujpe64.1.41.

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The formation of silver nanoparticles in a hydrogel on the basis of polyvinyl alcohol and polyethylene glycol at its crosslinking under the electron irradiation has been studied using the optical spectroscopy and scanning electron microscopy methods. The growth of nanoparticles 40–70 nm in size and their clustering into aggregates about a few hundred nanometers in diameter are demonstrated. The total concentration of nanoparticles and their size correlate with the concentration of ionic silver in the initial solution and the electron irradiation dose. The formation of nanoparticles is interpreted as a result of the radiation-induced chemical reduction of silver in the solution that is spatially confined in the cells of a 3D microstructure in the crosslinked hydrogel. The radiation-crosslinked hydrogel demonstrates an antiseptic effect for 7 of 8 tested microorganisms at silver concentrations of 0.001–0.003 wt.%, which is at least an order of magnitude lower than effective concentrations of ionic and colloidal silvers.
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Chumachenko, V., N. Kutsevol, Iu Harahuts, D. Soloviov, L. Bulavin, O. Yeshchenko, A. Naumenko, O. Nadtoka et A. Marinin. « Temperature Driven Transformation in Dextran-Graft-PNIPAM/Embedded Silver Nanoparticle Hybrid System ». International Journal of Polymer Science 2019 (12 juin 2019) : 1–7. http://dx.doi.org/10.1155/2019/3765614.

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During the last decade, stimuli-responsible polymers based on poly(N-isopropylacrylamide) having conformational transition in the range of physiological temperature have been discussed as novel drug delivery nanosystems. A star-like copolymer with a dextran core and grafted poly(N-isopropylacrylamide) arms (D-g-PNIPAM) was synthesized, characterized, and used as a matrix for silver sol preparation. The comparative study of the behavior of individual D-g-PNIPAM and the nanohybrid system D-g-PNIPAM/silver nanoparticles has been done in the temperature range near the lower critical solution temperature (LCST). The methods of Dynamic Light Scattering, small angle X-ray scattering, and UV-VIS absorption spectroscopy have been used. The existence of single nanoparticles and aggregated nanoparticles located in a limited polymer macromolecular volume was established. The increase of the temperature leads to slight aggregation of the silver nanoparticles at the LCST transition. Single nanoparticles do not aggregate with the temperature increase. The thermally induced collapse of end-grafted poly(N-isopropylacrylamide) chains above the LCST do not affect significantly the size characteristics of silver nanoparticles incorporated into the polymer matrix.
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