Sodium citrate stabilized Ag NPs under thermal treatment, electron-beam and laser irradiations

Filipczak, Paulina; Borkowski, Michał; Chudobinski, Piotr; Bres, Szymon; Matusiak, Małgorzata; Nowaczyk, Grzegorz; Kozanecki, Marcin

doi:10.1016/j.radphyschem.2018.07.020

Cited by 10 publications

(3 citation statements)

References 41 publications

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“…Moreover, the observed phenomenon is present only in the AgNPs blue sample, not in the AgNPs yellow sample. Also, changes in the structure of AgNPs induced by laser irradiation may be excluded, as an identical UV-vis absorption spectra of the investigated AgNPs dispersions (see Figure S1 in Supporting Information File 1) collected before and after Raman measurements confirmed their stability under the measurement conditions (the photo-and thermal stability of the investigated samples was discussed in [37]).…”

Section: Surface-enhanced Raman Scattering Effect Of Watermentioning

confidence: 79%

Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

Filipczak¹,

Hałagan²,

Ulański³

et al. 2021

Beilstein J. Nanotechnol.

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The resonance Raman effect (RRE) is a phenomenon which results in a strong selective enhancement of Raman signals from the samples. Previous studies showed that the RRE in liquid water directly corresponds to its supramolecular structure. It was also reported that the electric-field-induced orientation of water molecules on the electrode surface results in the surface-enhanced Raman scattering (SERS) effect. In this work, we show the SERS effect for water molecules in the dispersion of silver nanoparticles (AgNPs) without any external electrical field. An enhancement factor was estimated to be (4.8 ± 0.8) × 106 for an excitation wavelength of 514.5 nm and for AgNPs with an average size of 34 ± 14 nm. The temperature experiment results showed a higher enhancement with temperature increase. Performed simulation studies revealed a slowdown of the mobility of the water molecules close to the surface of AgNPs.

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Section: Surface-enhanced Raman Scattering Effect Of Watermentioning

confidence: 79%

Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

Filipczak¹,

Hałagan²,

Ulański³

et al. 2021

Beilstein J. Nanotechnol.

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“…Clearly, the schematic for the preparation process of the XSBR/CA/Ag film is shown in Figure . Here, CA not only helps to disperse Ag + but also acts as a reducing agent for Ag NPs. , Because of the excellent water solubility, CA molecules and Ag + can be dispersed uniformly between the XSBR latex particles, namely, the aqueous phase. As the water evaporates, CA is regenerated from the aqueous phase and dispersed uniformly in the interstitial space between XSBR particles.…”

Section: Resultsmentioning

confidence: 99%

Strengthened, Antibacterial, and Conductive Flexible Film for Humidity and Strain Sensors

Zheng

Lin

et al. 2020

ACS Appl. Mater. Interfaces

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With the development of artificial intelligence, people are not satisfied with the traditional conductive materials and tend to focus on stretchable and flexible electronic systems. Flexible conductive rubbers have great potential applications in wearable strain sensors. However, the rapid propagation of bacteria during the use of wearable sensors may be an ineluctable threat to humans’ health. Herein, a conductive rubber film is fabricated based on carboxylic styrene–butadiene rubber (XSBR), citric acid (CA), and silver nitrate (AgNO3) via a convenient approach, where Ag nanoparticles (Ag NPs) are in situ reduced without sintering at elevated temperatures. The resultant films exhibit many desirable and impressive features, such as strengthened mechanical properties, flexibility, and conductivity. More importantly, the Ag NP flexible conductive films exhibit excellent antibacterial activity against Escherichia coli (Gram-negative bacteria) and Staphylococcus aureus (Gram-positive bacteria), which have potential applications as flexible antibacterial materials to monitor movements of the human body in real time. Also, because of the hygroscopicity of CA, the resistance of our conductive film is sensitive to various humidities, which can be applied in the humidity sensor.

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“…Magnetite nanoparticles were prepared using the procedure reported in (8), in which a chemical coprecipitation method was used with some modification. Trisodium citrate was used as an electrostatic stabilizer to create an electrostatic double layer and reduced the extent of agglomeration 12,13,41 . In a typical experiment, ferric chloride (0.005 mol) and ferrous chloride (0.0025 mol) (molar ratio 2:1) were dissolved in deionized water (50 ml).…”

Section: Synthesis and Coating Of Magnetite Nanoparticlesmentioning

confidence: 99%

Conjugation strategies on functionalized iron oxide nanoparticles as a malaria vaccine delivery system

Al-Abboodi

Alsaady

Banoon

et al. 2021

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Vaccination has been used effectively to protect from infectious diseases and non-infectious diseases such as cancer and allergies. Different forms of particulate arrangements, including nanoparticles, virus-like particles (VLPs), and virosomes, have been built recently depending on the type of pathogen to be targeted. The ability to conjugate the recombinant Plasmodium yoelii, 19-kDa C-terminal fragment of merozoite surface protein 1 (PyMSP119) on the surface of superparamagnetic magnetite nanoparticles (SPIONs) was explored as a new technique of enhancing vaccination against malaria. Different conjugation strategies were performed to correlate the effects of nanoparticle chemistry surfaces to bind later with the malaria protein. (SPIONs) were prepared by chemical coprecipitation method and coated with 3-aminopropyltriethoxysilane (APTS) alone (as a surface coater), or with both APTS and polyethylene glycol (PEG) (as a shield to protect the malaria protein from proteolytic enzymes) by using a modified silanisation method. X-ray powder diffraction (XRD, Philips Model) patterns indicated that the SPIONs were of high purity with an inverse spinal structure. Fourier Transform Infrared Spectroscopy (FTIR) was collected using PerkinElmer Spectrum 100 Series; spectra of uncoated and coated magnetite nanoparticles confirmed that the silane layer had been coated on the surface Fe3O4. The SPIONs were superparamagnetic as investigated by Vibrating Sample Magnetometry (VSM, Princeton Applied Research, model ISS) and relatively stable in aqueous phase at room temperature and could also be quickly recovered from suspension using an external magnet. Introduce the carboxyl groups onto the SPIONs surfaces, resulting in a relatively high protein binding capacity onto the nanoparticle surfaces. The bare particles had a mean size of around 20 nm with a relatively narrow size distribution. 82% of African Green Monkey fibroblast (COS-7) were alive in nanoparticle suspension using the MTT assay method. The quantity of protein explicitly bound to particles was determined using Sodium Dodecyl Sulfate (SDS) - Polyacrylamide Gel Electrophoresis (PAGE). SDS–PAGE. When the conjugation blend was prepared in EDC, there was approximately 100% binding between PyMSP119 and the Fe3O4-COOH particles because no protein band was apparent at the expected molecular weight for PyMSP119 (45 kDa). The current study investigates the theory that the gradual, persistent release of the malaria antigen may stimulate and maintain an elevated level of immune response for an extended period in vivo, which will be the scope of future work.

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Sodium citrate stabilized Ag NPs under thermal treatment, electron-beam and laser irradiations

Cited by 10 publications

References 41 publications

Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

Strengthened, Antibacterial, and Conductive Flexible Film for Humidity and Strain Sensors

Conjugation strategies on functionalized iron oxide nanoparticles as a malaria vaccine delivery system

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