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112 results for “Silver nanoparticles”
Bacterial mediated green synthesis of silver nanoparticles and their antibacterial and antifungal activities against drug-resistant pathogens
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Targeted color design of silver-gold alloy nanoparticles
<p>This is the raw data for the manuscript:</p><p>Targeted color design of silver-gold alloy nanoparticles<br><br>Abstract:<br><br>This research article focuses on the targeted color design of silver-gold alloy nanoparticles (NPs), employing a multivariate optimization approach. NP synthesis involves interconnected process parameters, making independent variation challenging. Data-based property-process relationships are established to optimize optical properties effectively. We define a color target, employ a green chemical co-reduction method at room temperature and optimize process parameters accordingly. The CIEL*a*b* color space and Euclidean distances facilitate accurate color matching to establish the property-process relationship. Concurrently, theoretical Mie calculations explore the structure-property relationship across particle sizes, concentrations, and molar gold contents. The theoretically optimal structure agrees very well with experimental particle structures at the property-process relationship's optimum. The data-driven property-process relationship provides valuable insights into the formation mechanism of a complex particle system, sheds light on the role of relevant process parameters and allows to evaluate the practically available property space. Model validation beyond the original grid demonstrates its robustness, yielding colors close to the target. Additionally, Design of Experiments (DoE) methods reduce experimental work by threefold with slight accuracy trade-offs. Our novel methodology for targeted color design demonstrates how data-based methods can be utilized alongside structure-property relationships to unravel property-process relationships in the design of complex nanoparticle systems and paves the way for future developments in targeted property design.</p><p>All data are sorted according to their appearance in the figures of the main manuscript.</p>
Tailoring the reaction pathway for control of size and composition of silver-gold alloy nanoparticles
<p>This is the raw data for the manuscript:</p> <p>Tailoring the reaction pathway for control of size and composition of silver-gold alloy nanoparticles<br><br>Abstract:<br><br>In this work, we focus on tuning both the particle size and chemical composition of bimetallic silver-gold alloy nanoparticles (NPs) by carefully controlling the reaction pathway. NP synthesis involves the control of the supersaturation profile in time and space. For the reaction-controlled case, this supersaturation profile is determined by a network of reactions leading to the build-up of the monomer concentration. Using a variety of characterization tools, we show how the process conditions influence the coupled reactions in the complex formation mechanism of silver-gold alloy NPs. Applying a simple mass balance allows for the independent control of size and chemical composition of these NPs, yielding particles with constant composition and varying size in the range of 20 to 40 nm. A series of constant sizes and varying chemical compositions in the range of 10 % to 100 % molar gold content is also possible. Our new methodology shows an example of how reaction networks can be tailored to achieve targeted NP properties and paves the way for better control in the synthesis of multicomponent NPs.</p> <p> </p> <p>All data are sorted according to their appearance in the figures of the main manuscript.</p>
Decorated cenosphere surface with bioreduced silver nanoparticles for environmental applications
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United Atom Parameters for United Atom Multiscale Modelling Of Bio-Nano Interactions Of Zero-Valent Silver Nanoparticles
<p>Short-range surface adsorption potentials of carbohydrates, lipid fragments, and amino acid side chains in tabulated form.</p> <p>Calculated via AWT-MetaD (Gromacs/Plumed).</p> <p>Force Fields: INTERFACE/CHARMM36.</p> <p>Material: zero-valent silver</p>
Effects of Silver Nanoparticles on C. elegans Locomotion: Control vs. 50 µg/mL Treatment
<p>The effect of silver nanoparticles on the movement and speed of <em>C. elegans</em>, with a comparison between the control group and the treated group was shown in this video. In addition, the accumulation and change in the bodies of nematodes can be seen in the video.</p>
Topical Silver Nanoparticles for Microbial Activity
ClinicalTrials.gov study NCT03752424. IPD Sharing: NO. Countries: 1. Publications: 1.
The Comparative Effects of Using 0.12% Chlorhexidine and Silver Nanoparticles Mouthwashes in Medical Students
ClinicalTrials.gov study NCT06963788. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Evaluation of Silver Nanoparticles for the Prevention of COVID-19
ClinicalTrials.gov study NCT04894409. IPD Sharing: NO. Countries: 1. Publications: 29.
Silver Nanoparticles in Multidrug Resistant Bacteria
ClinicalTrials.gov study NCT04431440. IPD Sharing: UNDECIDED. Countries: 1. Publications: 1.
Comparison of the Efficacy of Calcium Hydroxide With Silver Nanoparticle and Conventional Calcium Hydroxide Intra Canal Medications on Post-Operative Pain in Symptomatic Root Canal Treatment Failure C
ClinicalTrials.gov study NCT04213716. IPD Sharing: NO. Countries: 1. Publications: 24.
Addition of Silver Nanoparticles to a Orthodontic Primer in Preventing Enamel Demineralization Adjacent Brackets
ClinicalTrials.gov study NCT02400957. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Data from: Characterization of self-assembled silver nanoparticle ink based on nanoemulsion method
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Biosynthesis, Characterization and Anti-dengue vector activity of Silver Nanoparticles prepared by Azadirachta indica and Citrullus colocynthis
<p><span>Here, we report biosynthesis of silver nanoparticles (AgNPs) using aqueous extracts of (i) <i>Azadirachta indica</i> leaves and (ii) <i>Citrullus colocynthis</i> fruit and their larvicidal activity against <i>Aedes aegypti.</i> The Uv-Vis spectroscopy absorption peaks occurred in range 412-416 nm for <i>A. indica</i> AgNPs and 416-431nm for <i>C. </i><i>colocynthis</i> AgNPs indicating the silver nature of prepared colloidal samples. The Scanning electron microscopy examination revealed the spherical morphology of both types of NPs with average size of 17±4 nm (<i>A. indica</i> AgNPs) and 26±5 nm (<i>C. </i><i>colocynthis</i> AgNPs). The x-ray diffraction pattern confirmed the face centred cubic (FCC) structure with crystallite size of 11±1 nm (<i>A. indica</i> AgNPs) and 15±1 nm (<i>C. </i><i>colocynthis</i> AgNPs) while characteristic peaks appearing in Fourier transform infrared spectroscopy analysis indicated the attachment of different biomolecules on AgNPs.. The larvicidal activity at different concentrations of synthesized AgNPs (1-20 </span>mg/L<span>) and extracts (0.5 % - 1.5 %) against <i>Aedes aegypti</i> was examined for 24 h. A concentration dependent larvicidal potential of both types of AgNPs was observed. The LC<sub>50 </sub>values were found to be 0.3 mg/L and 1.25 mg/L for <i>C. colocynthis</i> AgNPs and <i>A. indica</i> AgNPs respectively. However, extracts did not exhibit any notable larvicidal activity.</span></p>
Data from: Silver nanoparticles as a medical device in healthcare settings: a five-step approach for candidate screening of coating agents
Silver nanoparticle-based antimicrobials can promote a long lasting bactericidal effect without detrimental toxic side effects. However, there is not a clear and complete protocol to define and relate the properties of the particles (size, shape, surface charge, ionic content) with their specific activity. In this paper, we propose an effective multi-step approach for the identification of a 'purpose-specific active applicability window' to maximize the antimicrobial activity of medical devices containing silver nanoparticles (Ag NPs) (such as surface coaters), minimizing any consequent risk for human health (safety by design strategy). The antimicrobial activity and the cellular toxicity of four types of Ag NPs, differing in their coating composition and concentration have been quantified. Through the implementation of flow-field flow fractionation, Ag NPs have been characterized in terms of metal release, size and shape. The particles are fractionated in the process while being left unmodified, allowing for the identification of biological particle-specific contribution. Toxicity and inflammatory response in vitro have been assessed on human skin models, while antimicrobial activity has been monitored with both non-pathogenic and pathogenic Escherichia coli. The main benefit associated with such approach is the comprehensive assessment of the maximal effectiveness of candidate nanomaterials, while simultaneously indexing their properties against their safety.
Figure 1 in Nitrogen-fixing Cyanothece sp. as a mixotroph and silver nanoparticle synthesizer: a multitasking exceptional cyanobacterium
Figure 1. FTIR spectrum of biogenic silver nanoparticles from unfiltered external solution of Cyanothece sp.
The Datasheet of Synthesis of silver nanoparticles using microwave irradiation from Andaliman fruit (Zanthoxylum acanthopodium DC.) and exploring the potential of antibacterial, antibiofilm, and cell leakage activities
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Data from: Multigenerational exposure to silver ions and silver nanoparticles reveals heightened sensitivity and epigenetic memory in Caenorhabditis elegans
The effects from multigenerational exposures to engineered nanoparticles (ENPs) in their pristine and transformed states are currently unknown despite such exposures being an increasingly common scenario in natural environments. Here, we examine how exposure over 10 generations affects the sensitivity of the nematode Caenorhabditis elegans to pristine and sulfidized Ag ENPs and AgNO3. We also include populations that were initially exposed over six generations but kept unexposed for subsequent four generations to allow recovery from exposure. Toxicity of the different silver forms decreased in the order AgNO3, Ag ENPs and Ag2S ENPs. Continuous exposure to Ag ENPs and AgNO3 caused pronounced sensitization (approx. 10-fold) in the F2 generation, which was sustained until F10. This sensitization was less pronounced for Ag2S ENP exposures, indicating different toxicity mechanisms. Subtle changes in size and lifespan were also measured. In the recovery populations, the sensitivity to Ag ENPs and AgNO3 resulting from the initial multigenerational exposure persisted. Their response sensitivity for all endpoints was most closely related to the last ancestral exposed generation (F5), rather than unexposed controls. The mechanisms of transgenerational transfer of sensitivity are probably organized through the epigenome, and we encourage others to investigate such effects as a priority for mechanistic toxicology.
Caco-2 in vitro model of human gastrointestinal tract for studying the absorption of titanium dioxide and silver nanoparticles from seafood
<p><a href="https://www.sciencedirect.com/topics/chemistry/titanium-dioxide-nanoparticle">Titanium dioxide nanoparticles</a> (TiO<sub>2</sub> NPs) are widely used in industry as a white pigment (paints, paper industry and toothpastes), photocatalysts (environmental decontamination and photovoltaic cells), inorganic UV filter (sunscreens and personal care products) and as a <a href="https://www.sciencedirect.com/topics/chemistry/food-additive">food additive</a> (E171) and antimicrobial food packaging material. <a href="https://www.sciencedirect.com/topics/chemistry/silver-nanoparticle">Silver nanoparticles</a> (Ag NPs) are used in photonics, microelectronics, catalysis and medicine due to their catalytic activity, magnetic and optical polarizability, electrical and <a href="https://www.sciencedirect.com/topics/chemistry/thermal-conductivity">thermal conductivities</a> and enhanced Raman scattering. They also have antibacterial, antifungal and <a href="https://www.sciencedirect.com/topics/chemistry/antiviral-activity">antiviral activities</a>, as well as anti-inflammatory potential. The huge increase in the use of nano-based products, mainly metallic <a href="https://www.sciencedirect.com/topics/chemistry/nanoparticle">NPs</a>, implies the presence of <a href="https://www.sciencedirect.com/topics/chemistry/nanomaterial">nanomaterials</a> in the environment, and hence, the unintentional human ingestion through water or foods (gastrointestinal tract is the main pathway of NPs intake in humans).</p> <p>The presence of TiO<sub>2</sub> NPs and Ag NPs in seafood samples was firstly established using an ultrasound assisted <a href="https://www.sciencedirect.com/topics/chemistry/enzymatic-hydrolysis">enzymatic hydrolysis</a> procedure and sp-ICP-MS analysis. Several clams, cockles, mussels, razor clams, oysters and variegated scallops, which contain TiO<sub>2</sub> NPs and Ag NPs, were subjected to an <em>in vitro</em> digestion process simulating human gastrointestinal digestion in the stomach and in the small and large intestine to determine the bioaccessibility of these NPs. Caco-2 cells were selected as model of human intestinal epithelium for transport studies because of the development of membrane transporters that are responsible for the uptake of chemicals. Parameters as transepithelial electrical resistance (TEER) and permeability of Lucifer Yellow were studied for establishing cell monolayer integrity. TiO<sub>2</sub> NPs and Ag NPs transport as well as total Ti and Ag concentrations passing through the gastrointestinal epithelial barrier model (0–2 h) were assessed by sp-ICP-MS and ICP-MS in several molluscs.</p>
Efficacy of Silver Nanoparticle Gel Versus a Common Antibacterial Hand Gel
ClinicalTrials.gov study NCT00659204. IPD Sharing: NO. Countries: 1. Publications: 0.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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