Polyelectrolyte-Stabilised Magnetic-Plasmonic Nanocomposites

Stafford, Shelley; Garnier, Coralie; Gun’ko, Yurii K.

doi:10.3390/nano8121044

Cited by 4 publications

(4 citation statements)

References 28 publications

(34 reference statements)

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“…All of these prove that PSS is successfully attached to the surface of nanoparticles. Moreover, the high zeta potential confirmed that the stability and dispersion of the nanoparticles were maintained due to the mutual repulsion between PGMNPs with high negative charge [38,39].…”

Section: Characterization Of Gmnpsmentioning

confidence: 97%

“…1(a), GMNPs are functionalized with CTAB surfactants, next modified with PSS, and the modified GMNPs (PGMNPs) are conjugated with anti-digoxin antibody by physical adsorption. PSS has a very strong negative charge, so the steric hindrance and electrostatic repulsion between nanoparticles, and its corresponding monodispersity and stability can be effectively enhanced when PSS is coated on the surface [38,39].…”

Section: Assembly and Modification Of Gmnpsmentioning

confidence: 99%

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Super-assembly of integrated gold magnetic assay with loop-mediated isothermal amplification for point-of-care testing

et al. 2022

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With the increasing global threat of various diseases and infections, it is essential to develop a fast, low-cost, and easy-to-use point-of-care testing (POCT) system for inspections at all levels of medical institutions and self-examination at home. In this work, gold magnetic nanoparticles (GMNPs) are used as the key material, and a rapid visual detection method is designed through integrating loop-mediated isothermal amplification (LAMP) and lateral flow assay (LFA) biosensor for detecting a variety of analytes which includes whole blood, buccal swabs, and DNA. It is worth to note that the proposed method does not need DNA extraction. Furthermore, uracil DNA glycosylase (UDG) is employed to eliminate carrier contamination for preventing false positive results. The whole detection process can be finished within 25 min. The accuracy of detection is measured by assessing the polymorphisms of the methylenetetrahydrofolate reductase (MTHFR) C677T. The detection limit of the newly developed extraction-free detection system for MTHFR C677T is 0.16 ng/μL. A preliminary clinical study of the proposed method is carried out by analyzing 600 clinical samples (including 200 whole blood samples, 100 buccal swabs, and 300 genomic DNA samples). The results indicate that the proposed method is 100% consistent with the sequencing results which provides a new choice for POCT and shows a broad application prospect in all levels of medical clinics and at home. Electronic Supplementary Material Supplementary material (details for MTHFR C677T primer sequences, the cell count results of samples at different dilution ratios, genotyping results and frequency samples, a Hardy—Weinberg equilibrium test, the sensitivity of the system, detection results of multiple samples, and optimization of the system) is available in the online version of this article at 10.1007/s12274-022-4692-9.

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Section: Characterization Of Gmnpsmentioning

confidence: 97%

Section: Assembly and Modification Of Gmnpsmentioning

confidence: 99%

Super-assembly of integrated gold magnetic assay with loop-mediated isothermal amplification for point-of-care testing

et al. 2022

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“…PSS, a polyelectrolyte, played a pivotal role in this process. Initially, it accommodates silver ions (Ag + ) through electrostatic interactions during the synthesis phase and after the reduction of silver ions, PSS can stabilize the nanoparticles through various possible mechanisms, such as steric effects and potentially chemical bonding interactions (CHONG et al, 2020;STAFFORD;GARNIER;GUN'KO, 2018). The UV-Vis spectra (Fig.…”

Section: Synthesis and Characterization Of Ag-pss Nanohybridmentioning

confidence: 99%

Green synthesis of Ag-Poly (styrene sulfonate) nanoparticles and their application in cotton fabric

Matsushita,

Gaudêncio,

Garcia

2023

Cuad. Ed. Desar.

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This paper presents a method for the controlled reduction of silver chloride (AgCl) by D-(+)-Maltose in the presence of poly(sodium 4-styrenesulfonate) (PSS). PSS, acting as a polyelectrolyte, plays a crucial role in the process by accommodating silver ions (Ag+) through electrostatic interactions during synthesis and stabilizing the resulting silver nanoparticles (AgNPs). UV-Vis spectra revealed distinct absorption bands characteristic of AgNPs, with the Ag-PSS ratio affecting the size and distribution of nanoparticles. Dynamic light scattering (DLS) and zeta potential measurements confirmed the relationship between silver concentration and nanoparticle uniformity. Layer-by-Layer (LbL) deposition of Ag-PSS nanohybrids on cotton fabric surfaces, offering a unique approach for fabric modification. Energy-Dispersive X-ray Spectroscopy (EDS) analysis demonstrated a consistent increase in silver content with an increase in bilayers. Scanning Electron Microscopy (SEM) revealed enhanced fiber roughness, indicating effective nanohybrid deposition. Elemental mapping showcased uniform elemental distribution across the fiber surface, underscoring the precision of the LbL technique. In conclusion, this study presents an effective method for achieving uniform surface modification of cotton fibers through LbL deposition of Ag-PSS nanohybrids.

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“…The MNP coated with ionizable polymers, the so-called polyelectrolytes, has attracted great attentions recently [9,10]. In polar solvents such as water, their ionizable groups can dissociate, resulting in the formation of charges on the polymer chains and the release of counterions in solution.…”

Section: Introductionmentioning

confidence: 99%

Fine-Tuning the Degree of Negative Charge and Carboxylate Grafting Density of Polymer-Coated Magnetite Nanoparticle

2023

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The surface of magnetite nanoparticle (MNP) was modified with poly(acrylic acid)(PAA)-poly(ethylene glycol) methyl methacrylate (PEGMA) (co)polymer to obtain water dispersible MNP with pH sensitive surfaces via atom transfer radical polymerization (ATRP) of tert-butyl acrylate (t-BA), followed by the t-BA group deprotection. Molar compositions of the (co)polymer were systematically varied, namely 100:0, 75:25, 50:50 and 25:75 of P(t-BA)/PEGMA, respectively, such that the grafting density of carboxylate groups on the MNP surface after the deprotection can be fine-tuned. Transmission electron microscopy (TEM) indicated that the MNP were spherical (ca.5-12 nm in diameter) with some nanoclustering observed. The roles of PAA and PEGMA affecting the hydrodynamic size and zeta potential of the nanocomposites observed via photocorrelation spectroscopy (PCS) were discussed. The percentages of the polymeric composition in the nanocomposites in each step of the reaction were determined via thermogravimetric analysis (TGA) and their magnetic properties were studied via vibrating sample magnetometry (VSM). These novel nanocomposites with pH sensitive surface and magnetically guidable properties might be advantageous for further conjugations either by covalent or ionic bonding with bioentities. HIGHLIGHTS Magnetite nanoparticle (MNP) coated poly(acrylic acid)(PAA)-poly(ethylene glycol) methyl methacrylate (PEGMA) (co)polymer were fabricated via ATRP The ratio of t-BA to PEGMA used in the copolymerization was studied The nanocomposites showed pH sensitive surface and magnetically guidable properties GRAPHICAL ABSTRACT

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Polyelectrolyte-Stabilised Magnetic-Plasmonic Nanocomposites

Cited by 4 publications

References 28 publications

Super-assembly of integrated gold magnetic assay with loop-mediated isothermal amplification for point-of-care testing

Super-assembly of integrated gold magnetic assay with loop-mediated isothermal amplification for point-of-care testing

Green synthesis of Ag-Poly (styrene sulfonate) nanoparticles and their application in cotton fabric

Fine-Tuning the Degree of Negative Charge and Carboxylate Grafting Density of Polymer-Coated Magnetite Nanoparticle

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