4,863 results match your criteria silver layer


Electrochemical Reduction of CO Toward C Valuables on [email protected] Core-Shell Tandem Catalyst with Tunable Shell Thickness.

Small 2021 Aug 3:e2102293. Epub 2021 Aug 3.

Key Laboratory of Flexible Electronics (KLOFE)Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing, 210009, China.

Electrochemical CO reduction reaction (CO RR) is critical to converting CO to high-value multicarbon chemicals. However, the Cu-based catalysts as the only option to reduce CO into C products suffer from poor selectivity and low activity. Tandem catalysis for CO reduction is an efficient strategy to overcome such problems. Read More

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Deep-Sintered Copper Tracks for Thermal Oxidation Resistance Using Large Pulsed Electron Beam.

ACS Omega 2021 Jul 13;6(29):19134-19143. Epub 2021 Jul 13.

School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea.

Thermal oxidation resistance is an important property in printed electronics for sustaining electrical conductivity for long time and/or under harsh environments such as high temperature. This study reports the fabrication of copper nanoparticles (CuNPs)-based conductive tracks using large pulsed electron beam (LPEB) by irradiation on CuNPs to be sintered. With an acceleration voltage of 11 kV, the LPEB irradiation induced deep-sintering of CuNPs so that the sintered CuNPs exhibited bulk-like electrical conductivity. Read More

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Comparison of the possible histopathological changes of the rat neonatal cerebellum induced by toxic and nontoxic doses of biological silver nanoparticles with chemical silver nanoparticles.

Brain Behav 2021 Aug 1. Epub 2021 Aug 1.

Department of Medical Sciences, Shahrood Branch, Islamic Azad University, Shahrood, Iran.

Introduction: Today, due to the increasing application of silver nanoparticles in medical products, it is necessary to pay attention to the user's safety. There are three methods, namely, chemical, physical, and biological, used for the production of nanoparticles. Although the first two methods might introduce health hazards, the latter is hypothetically safe. Read More

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Stretchable and Sensitive Silver Nanowire-Hydrogel Strain Sensors for Proprioceptive Actuation.

ACS Appl Mater Interfaces 2021 Jul 29. Epub 2021 Jul 29.

Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583.

Safer human-robot interactions mandate the adoption of proprioceptive actuation. Strain sensors can detect the deformation of tools and devices in unstructured and capricious environments. However, such sensor integration in surgical/clinical settings is challenging due to confined spaces, structural complexity, and performance losses of tools and devices. Read More

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An all-in-one magnetic SERS nanosensor for ratiometric detection of Escherichia coli in foods.

Anal Bioanal Chem 2021 Jul 29. Epub 2021 Jul 29.

Chongqing Key Laboratory of Catalysis and Functional Organic Molecule, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, China.

An all-in-one nanosensor was developed for the magnetic enrichment and ratiometric surface-enhanced Raman scattering (SERS) detection of Escherichia coli (E. coli). The all-in-one nanosensor was constructed through the chemical integration of four components into a single nanoparticle, which include a manganese ferrite nanoparticle serving as the magnetic core, a thin silver shell as the SERS substrate, a self-assembled layer of 4-mercaptobenzoic acid (MBA) molecules as the SERS internal standard, and a MBA-conjugated layer of aptamer sequences as the capture probe of E. Read More

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MoS nanosheets/silver nanoparticles anchored onto textile fabric as "dip catalyst" for synergistic p-nitrophenol hydrogenation.

Environ Sci Pollut Res Int 2021 Jul 27. Epub 2021 Jul 27.

Laboratory of Applied Organic Chemistry, Faculty of Science and Techniques, Sidi Mohamed Ben Abdellah University, 2202, Fes, Morocco.

Attaining a synergistic merge between the performance of homogenous catalysts and the recyclability of heterogeneous catalysts remains until now a concerning issue. The main challenge is to design efficient, low-cost catalyst with outstanding reusability, facile recovery, and ease of retrieval and monitoring between the reuses. Despite the vast efforts in the development of silver nanoparticle-based catalyst for the reaction of hydrogenation of 4-nitrophenol, the aforementioned criteria are infrequently found in a chosen system. Read More

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Pluronic-loaded Silver Nanoparticles/Photosensitizers Nanohybrids: Influence of the Polymer Chain Length on Metal-Enhanced Photophysical Properties.

Photochem Photobiol 2021 Jul 26. Epub 2021 Jul 26.

Laboratory of Hybrid Materials, Department of Chemistry, Federal University of São Paulo, Diadema, São Paulo, Brazil.

Silver nanoparticles (AgNPs) are incredibly versatile nanostructures that more recently have been exploited to create advanced optoelectronic materials due enhancement of local magnetic field after its irradiation. However, the use of AgNPs as nanoantennas to amplify photophysical properties of close photosensitizer (PS) molecules in photodynamic therapy is still underexplored. The reason for that is the difficulty to control crucial parameters such as silver-PS distance in aqueous solution. Read More

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Enhancing Singlet Oxygen Photocatalysis with Plasmonic Nanoparticles.

ACS Appl Mater Interfaces 2021 Jul 26. Epub 2021 Jul 26.

Centre for Green Chemistry and Catalysis, Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada.

Photocatalysts able to trigger the production of singlet oxygen species are the topic of intense research efforts in organic synthesis. Yet, challenges still exist in improving their activity and optimizing their use. Herein, we exploited the benefits of plasmonic nanoparticles to boost the activity of such photocatalysts via an antenna effect in the visible range. Read More

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A rational design of multimodal asymmetric nanoshells as efficient tunable absorbers within the biological optical window.

Sci Rep 2021 Jul 23;11(1):15115. Epub 2021 Jul 23.

Department of Physics, Sharif University of Technology, Tehran, Iran.

In this work, the optical properties of asymmetric nanoshells with different geometries are comprehensively investigated in the quasi-static regime by applying the dipolar model and effective medium theory. The plasmonic behaviors of these nanostructures are explained by the plasmon hybridization model. Asymmetric hybrid nanoshells, composed of off-center core or nanorod core surrounded by a spherical metallic shell layer possess highly geometrically tunable optical resonances in the near-infrared regime. Read More

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Antibacterial Properties of a Honeycomb-like Pattern with Cellulose Acetate and Silver Nanoparticles.

Materials (Basel) 2021 Jul 20;14(14). Epub 2021 Jul 20.

Department of Solid State Engineering, University of Chemistry and Technology Prague, Technická 3, 166 28 Prague, Czech Republic.

This study involved the preparation and characterization of structures with a honeycomb-like pattern (HCP) formed using the phase separation method using a solution mixture of chloroform and methanol together with cellulose acetate. Fluorinated ethylene propylene modified by plasma treatment was used as a suitable substrate for the formation of the HCP structures. Further, we modified the HCP structures using silver sputtering (discontinuous Ag nanoparticles) or by adding Ag nanoparticles in PEG into the cellulose acetate solution. Read More

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Novel Insights into Inkjet Printed Silver Nanowires Flexible Transparent Conductive Films.

Int J Mol Sci 2021 Jul 19;22(14). Epub 2021 Jul 19.

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.

Silver nanowire (AgNWs) inks for inkjet printing were prepared and the effects of the solvent system, wetting agent, AgNWs suspension on the viscosity, surface tension, contact angle between ink droplet and poly(ethylene) terephthalate (PET) surface, and pH value of AgNWs ink were discussed. Further, AgNWs flexible transparent conductive films were fabricated by using inkjet printing process on the PET substrate, and the effects of the number printing layer, heat treatment temperature, drop frequency, and number of nozzle on the microstructures and photoelectric properties of AgNWs films were investigated in detail. The experimental results demonstrated that the 14-layer AgNWs printed film heated at 60 °C and 70 °C had an average sheet resistance of 13 Ω∙sq and 23 Ω∙sq and average transparency of 81. Read More

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Pinhole-Free Shell-Isolated Nanoparticle Enhanced Raman Spectroscopy for Interference-Free Probing of Electrochemical Reactions.

J Phys Chem Lett 2021 Jul 22;12(29):7046-7052. Epub 2021 Jul 22.

Electrodics and Electrocatalysis Division (EEC), CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi 630003, Tamil Nadu, India.

Investigating the behavior of analytes at the electrode surface is crucial in understanding the electrochemical and electrocatalytic reactions. Although Surface Enhanced Raman Scattering (SERS) is sensitive to minor chemical changes in the analyte, it is not widely used to study the reaction mechanisms on nonplasmonic surfaces because of the interference from plasmonic SERS substrates. In this study, we have investigated the redox reaction of Nile Blue A on a glassy carbon surface using pinhole-free silica-coated silver nanoparticles for Raman signal enhancement. Read More

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Physicochemical aspects of design of ultrathin films based on chitosan, pectin, and their silver nanocomposites with antiadhesive and bactericidal potential.

J Biomed Mater Res A 2021 Jul 22. Epub 2021 Jul 22.

Laboratory of micro- and nanostructured systems, Institute of chemistry of new materials National academy of sciences of Belarus, 36 F. Skaryna str, Minsk, 220141, Belarus.

Implant-related infection is one of the serious problems in regenerative medicine. Promising approach to overcome the problems caused by bacterial growth on the medical implants is their modification by bioactive coatings. A versatile technique for designing multilayer films with tailored characteristics at the nanometer scale is layer-by-layer assembly. Read More

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In vivo corneal confocal microscopy and optical coherence tomography on eyes of participants with type 2 diabetes mellitus and obese participants without diabetes.

Graefes Arch Clin Exp Ophthalmol 2021 Jul 20. Epub 2021 Jul 20.

Department of Ophthalmology, University of Pécs, Medical School, Akác u. 1, Pécs, 7623, Hungary.

Purposes: To examine corneal nerve and retinal nerve characteristics of participants with type 2 diabetes mellitus (T2DM) compared with obese participants without diabetes to discover potential nerve vulnerabilities.

Methods: All participants underwent a complete medical examination including a physical examination and blood sample tests. The ophthalmologic examination included best-corrected visual acuity, intraocular pressure, Schirmer test, tear film breakup time, slit-lamp examination, dilated fundus photography, in vivo corneal confocal microscopy (IVCCM), and optical coherence tomography (OCT). Read More

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Fabrication and Application of Photocatalytic Composites and Water Treatment Facility Based on 3D Printing Technology.

Polymers (Basel) 2021 Jul 1;13(13). Epub 2021 Jul 1.

Biomass 3D Printing Materials Research Center, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.

Currently, the degradation of organic pollutants in wastewater by photocatalytic technology has attracted great attention. In this study, a new type of 3D printing material with photocatalytic activity was first prepared to print a water treatment equipment, and then a layer of silver-loaded TiO was coated on the equipment to further improve the catalytic degradation performance. The composite filaments with a diameter of 1. Read More

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Unilateral Silver-Loaded Silk Fibroin Difunctional Membranes as Antibacterial Wound Dressings.

ACS Omega 2021 Jul 30;6(27):17555-17565. Epub 2021 Jun 30.

Department of Periodontology, School and Hospital of Stomatology, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong 250012, China.

Silk fibroin (SF) has been widely used as wound dressings due to its good biocompatibility. To enhance the antibacterial properties of the dressings, silver (Ag) is often added. However, an overdose of Ag may cause cytotoxicity and inhibit wound healing. Read More

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Comparison of Antibacterial Mode of Action of Silver Ions and Silver Nanoformulations With Different Physico-Chemical Properties: Experimental and Computational Studies.

Front Microbiol 2021 1;12:659614. Epub 2021 Jul 1.

Department of Microbiology, Faculty of Biological Sciences, University of Wrocław, Wrocław, Poland.

The aim of this study was to compare the antibacterial mode of action of silver ions (Ag) and selected silver nanoformulations against strains ( J53, BW25113 and its derivatives: Δ A, Δ C, Δ F, Δ R, ompRG596AcusSG1130A, cusSG1130A). In this research we used various experimental methods and techniques such as determination of the minimal inhibitory concentration, flow cytometry, scanning electron microscopy, circular dichroism as well as computational methods of theoretical chemistry. Thanks to the processing of bacteria and silver samples (ions and nanoformulations), we were able to determine the bacterial sensitivity to silver samples, detect reactive oxygen species (ROS) in the bacterial cells, visualize the interaction of silver samples with the bacterial cells, and identify their interactions with proteins. Read More

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Six-Month Long Degradation Tests of Biodegradable Twinning-Induced Plasticity Steels Alloyed with Ag for Stent Applications.

ACS Biomater Sci Eng 2021 Jul 16. Epub 2021 Jul 16.

Laboratory for Biomaterials and Bioengineering, Canada Research Chair I in Biomaterials and Bioengineering for the Innovation in Surgery, Department of Min-Met-Materials Engineering, Research Center of CHU de Quebec, Division of Regenerative Medicine, Laval University, Quebec City, Quebec G1V 0A6, Canada.

Twinning-induced plasticity (TWIP) Fe-Mn-C steels are biodegradable metals with far superior mechanical properties to any biodegradable metal, including Mg alloys, used in commercially available devices. For this reason, the use of Fe-Mn-C alloys to produce thinner and thinner implants can be exploited for overcoming the device size limitations that biodegradable stents still present. However, Fe-Mn steels are known to form a phosphate layer on their surface over long implantation times in animals, preventing device degradation in the required timeframe. Read More

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Plasmonic nanodiscs on vanadium dioxide thin films for tunable luminescence enhancement.

Opt Express 2021 Jul;29(14):22288-22298

We propose an alternative method to dynamically tune luminescence enhancement in the near infrared spectral range using noble metal nanostructures on top of phase change material vanadium dioxide (VO) thin films. The VO phase change is used to tune the nanodisc plasmon resonance providing a luminescence modification mechanism. We employ a model to calculate the emission of quantum emitters, such as dye molecules, in hybrid systems comprising single silver (Ag) nanodiscs on top of a thin layer of VO. Read More

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Near-infrared sensitivity improvement by plasmonic diffraction for a silicon image sensor with deep trench isolation filled with highly reflective metal.

Opt Express 2021 Jul;29(14):21313-21319

We propose a plasmonic diffraction structure combined with deep trench isolation (DTI) filled with highly reflective metal to enhance the near-infrared (NIR) sensitivity of image sensors. The plasmonic diffraction structure has a silver grating on the light-illuminated surface of a typical silicon backside-illuminated CMOS image sensor. The structural parameters of the silver grating were investigated through simulations, and the mechanism of the NIR sensitivity enhancement was clarified. Read More

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Silver Nanowire-Based Printable Electrothermochromic Ink for Flexible Touch-Display Applications.

ACS Appl Mater Interfaces 2021 Jul 15;13(29):34550-34560. Epub 2021 Jul 15.

Electronic Materials and Thin Films Lab, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India.

Flexible, lightweight, low-power, and low-cost displays are an active area of interest in the electronics community. In this work, we have developed a composite electrothermochromic material consisting of silver nanowires (Ag NWs) and thermochromic powders, which exhibits reversible color (phase) change during biasing due to Joule heating. A wide variety of color combinations are possible with suitable thermochromic material selection. Read More

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Hydraulic flow direction alters impacts of AgNPs on pollutant removal and silver spatial distribution in vertical flow constructed wetlands.

Environ Sci Pollut Res Int 2021 Jul 14. Epub 2021 Jul 14.

Department of Municipal Engineering, School of Civil Engineering, Southeast University, No. 2 Southeast University Road, Nanjing Jiangsu Province, 211189, China.

This study investigated the effects of AgNPs on pollutant removals in constructed wetlands (CWs) with different flow patterns and spatial distributions of silver. Before exposure to AgNPs, upward flow constructed wetland (UCW) had better nitrogen removal than down-flow CW (DCW). And 0. Read More

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Rapid Antibacterial Effects of Silk Fabric Constructed through Enzymatic Grafting of Modified PEI and AgNP Deposition.

ACS Appl Mater Interfaces 2021 Jul 12;13(28):33505-33515. Epub 2021 Jul 12.

Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, Wuxi 214122, China.

Enzymatic antibacterial finishing is an eco-friendly alternative to develop functional silk-based materials. However, the low accessibility of tyrosine residues distributed in fibroin chains restricts the laccase-mediated functionalization of silk fibers (SF). To address this issue, a highly reactive -hydroxyphenylacetic acid-modified polyethyleneimine (mPEI) was enzymatically grafted onto fibroin using laccase, aiming at constructing an antibacterial matrix of mPEI on the fiber surface. Read More

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Preparation and characterization of silver orthophosphate photocatalytic coating on glass substrate.

Sci Rep 2021 Jul 7;11(1):13968. Epub 2021 Jul 7.

Department of Applied Chemistry and Biochemistry, Fukushima College, National Institute of Technology, Nagao 30, Kamiarakawa, Taira, Iwaki, Fukushima, 970-8034, Japan.

The photocatalytic activity of silver orthophosphate AgPO has been studied and shown to have a high photo-oxidation capability. However, there is few reported example of a simple method to prepare AgPO coatings on various substrates. In this study a novel and simple method to immobilize AgPO on the surface of glass substrates has been developed. Read More

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Lab-on-fiber sensing system based on responsive Fabry-Perot optical resonance cavities prepared throughconstruction strategy.

Nanotechnology 2021 Jul 22;32(41). Epub 2021 Jul 22.

College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China.

For decades, lab-on-fiber (LOF) sensing systems have become an emerging optical sensing platform due to the features of small size and light weight. Herein, a simple and efficientconstruction strategy was reported for the preparation of LOF sensing platform based on the integration of responsive Fabry-Perot optical resonance cavity on optical fibers. The responsive Fabry-Perot optical resonance cavity with thermal poly(N-isopropylacrylamide) polymer brush layer sandwiched by two silver layers was constructed on the end surface of the optical fiber through combiningsurface-initiated polymerization and metal film deposition techniques. Read More

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Interpenetrating polysaccharide-based hydrogel: A dynamically responsive versatile medium for precisely controlled synthesis of nanometals.

Mater Sci Eng C Mater Biol Appl 2021 Aug 27;127:112211. Epub 2021 May 27.

Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials &Application, Key Laboratory of Textile Fiber & Product, Ministry of Education, Wuhan Textile University, Wuhan 430200, China. Electronic address:

Herein, we reported an interpenetrating polysaccharide-based hydrogel in which carboxymethyl chitosan (CMC) chains were physically dispersed throughout the thermoplastic elastomer gel network has been developed as a versatile platform for precisely controlled synthesis of nanometals. Results indicated the interpenetrated CMC chains could serve as multifunctional fillers for metal ions adsorption and stabilization while the thermally reconfigurable agarose (Agar) gel medium provides three-dimensional semi-solid framework for entrapping and recollecting of the fabricated nanometals. Specifically, the CMC chains were found to strongly coordinate with silver ions as a dynamically responsive metal-biopolymer complex within the bulk gel network as confirmed by the enhanced mechanical properties and regulated shape memory performances. Read More

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Therapeutic effect of autologous concentrated growth factor on lower-extremity chronic refractory wounds: A case report.

World J Clin Cases 2021 Jun;9(18):4797-4802

Department of Burn and Plastic Surgery, Shenzhen Longhua District Central Hospital, Shenzhen 518110, Guangdong Province, China.

Background: Management of chronic refractory wounds is one of the toughest clinical challenges for surgeons. Because of poor blood supply, less tissue coverage, and easy exposure, the lower leg is a common site for chronic refractory wounds. The current therapeutic regimens often lead to prolonged hospital stay and higher healthcare costs. Read More

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Reduced Self-Aggregation and Improved Stability of Silica-Coated FeO/Ag SERS-Active Nanotags Functionalized With 2-Mercaptoethanesulfonate.

Front Chem 2021 16;9:697595. Epub 2021 Jun 16.

Faculty of Chemistry, University of Warsaw, Warsaw, Poland.

Nanocomposites combining magnetic and plasmonic properties are very attractive within the field of surface-enhanced Raman scattering (SERS) spectroscopy. Applications presented so far take advantage of not only the cooperation of both components but also synergy (enhanced properties), leading to multi-approach analysis. While many methods were proposed to synthesize such plasmonic-magnetic nanoparticles, the issue of their collective magnetic behavior, inducing irreversible self-aggregation, has not been addressed yet. Read More

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A Novel Self-Assembly Strategy for the Fabrication of Nano-Hybrid Satellite Materials with Plasmonically Enhanced Catalytic Activity.

Nanomaterials (Basel) 2021 Jun 16;11(6). Epub 2021 Jun 16.

Surface Science Research Centre, Department of Chemistry, University of Liverpool, Liverpool L69 3BX, UK.

The generation of hydrogen from water using light is currently one of the most promising alternative energy sources for humankind but faces significant barriers for large-scale applications due to the low efficiency of existing photo-catalysts. In this work we propose a new route to fabricate nano-hybrid materials able to deliver enhanced photo-catalytic hydrogen evolution, combining within the same nanostructure, a plasmonic antenna nanoparticle and semiconductor quantum dots (QDs). For each stage of our fabrication process we probed the chemical composition of the materials with nanometric spatial resolution, allowing us to demonstrate that the final product is composed of a silver nanoparticle (AgNP) plasmonic core, surrounded by satellite Pt decorated CdS QDs ([email protected]), separated by a spacer layer of SiO with well-controlled thickness. Read More

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Stability of Metronidazole and Its Complexes with Silver(I) Salts under Various Stress Conditions.

Molecules 2021 Jun 11;26(12). Epub 2021 Jun 11.

Department of Bioinorganic Chemistry, Chair of Medicinal Chemistry, Faculty of Pharmacy, Medical University of Lodz, Muszyńskiego 1, 90-151 Łódź, Poland.

Metronidazole is a drug widely used in the prevention and treatment of bacterial infections. Due to its possibility of the formation of stable metal complexes, it was decided to broaden its activity spectrum by introducing the silver(I) coordination compounds i.e. Read More

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