Temperature sensitive hydrogels cross-linked by magnetic LAPONITE® RD®: effects of particle magnetization

Lebovka, Nikolaï; Samchenko, Yu. M.; Kernosenko, L.; Poltoratska, Tetiana; Пасмурцева, Н.; Mamyshev, Igor E.; Gigiberiya, Vladimir A.

doi:10.1039/d0ma00687d

Cited by 4 publications

(2 citation statements)

References 51 publications

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“…It was stated that this situation is related to the polymer/water interfacial tension. In the study of Lebovka et al, 37 it was observed that the laponite particles are covered by magnetite nanoparticles due to the differences in surface charges, causing the formation of large magnetic particle clusters. Finally, we can say that the increase in particle size of magnetic latexes (LAMP‐2/3/4/5) compared to latex without MNPs (LAMP‐1) indicates that clay/Fe 3 O 4 nanoparticles are encapsulated in polymer particles 27,38 .…”

Section: Resultsmentioning

confidence: 99%

Laponite/magnetite nanoparticles including waterborne latexes and effect of conditions for stable composite latexes

Kartaloğlu,

Delibaş

2023

Polymer Composites

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Recent studies have emphasized that the inclusion of magnetic nanoparticles (MNPs) in the polymer structure with the mini‐emulsion technique is the most ideal technique in terms of controlling their physical (size, shape, etc.) and chemical (surface chemistry, etc.) properties. In this study, MNPs were modified with clay (laponite) and made compatible with polymers. Then, clay‐modified MNPs (laponite/magnetite, LAM) were incorporated into acrylic polymers by semibatch mini‐emulsion polymerization in an oil phase containing monomer, initiator, and hydrophobic substance. The contribution of clay content to the functionality of MNPs and the properties of polymer nanoparticles containing LAM were investigated. The structures of the synthesized nanoparticles and polymeric materials were elucidated by Fourier transform infrared spectroscopy and X‐Ray Diffraction (XRD) analyses. The morphology of the latexes was clarified by atomic force microscope (AFM) and field emission scanning electron microscope (FESEM) Scanning transmission electron microscopy (STEM) analyses, and the atomic percentage values were determined by FESEM‐EDAX detector analysis. Thermal properties were determined by differential scanning calorimetry and thermogravimetric analysis, and strength endurance was determined by a tensile test. The results showed that LAM could be successfully incorporated into the polymer structure without precipitation by mini‐emulsion polymerization, and this technique is suitable for the preparation of nanocapsules. Moreover, it was determined that MNPs increased particle sizes and viscosity of the latexes. Also, increase in surface roughness with enhanced nanoparticle concentration was observed from the AFM images. The composite latex with 2% LAM showed the greatest increase in mechanical characteristics.Highlights LAM nanoparticle Synthesis was carried out. Stable nanocomposite of LAM nanoparticle in latexes was achieved via mini‐emulsion polymerization. LAM successfully incorporated to the acrylic latexes without precipitation. Properties of the acrylic latexes were improved by incorporation of LAM.

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Section: Resultsmentioning

confidence: 99%

Laponite/magnetite nanoparticles including waterborne latexes and effect of conditions for stable composite latexes

Kartaloğlu,

Delibaş

2023

Polymer Composites

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“…Modification of Lap particles also resulted in changing of a three-dimensional spatial network in hydrogels. For example, the use of magnetically modified Lap as a physical cross-linking agent allowed us to synthesize magnetic thermosensitive hydrogel nanocomposites with improved mechanical properties and swelling ability, controllable temperature-induced drug release, and demonstrated promise as a nanoplatform for targeted contactless drug delivery under application of weak magnetic fields . Biocompatible and magneto-responsive Lap-based hydrogels with tunable properties were prepared.…”

Section: Introductionmentioning

confidence: 99%

Cross-Linked Hydrogels Based on PolyNIPAAm and Acid-Activated Laponite RD: Swelling and Tunable Thermosensitivity

et al. 2022

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The effects of acid activation of Laponite RD (Lap) on the structure and properties of activated Lap nanoparticles (aLap) and the properties of polyNIPAA m hydrogels physically cross-linked by aLap have been studied. The acid activation of Lap by the sulfuric acid was done using the concentration of sulfuric acid within the interval C a = 0.525−14.58% for 10 h. For slightly activated samples (C a ≤ 1.25 wt %), the significant increase of the specific surface area (by ≈1.56 times) was accompanied with a significant decrease in both the values of the specific heat of immersion in water and n-decane. However, the hydrophilic properties of all samples S 0 −S 5 were still observed. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) data, Fourier transform infrared (FTIR) spectra, and X-ray diffraction (XRD) patterns demonstrated that the acid activation resulted in the destruction of the crystal lattice of Lap, leaching of magnesium and lithium, and formation of the amorphous phases. Moreover, the acid activation significantly affected aggregation and negative surface charges of the aLap faces in aqueous suspension. The effects of aLap on the swelling properties and cooperativity in the phase transitions of polyNIPAA m hydrogels cross-linked by aLap are also discussed. It was demonstrated that an increase in C a resulted in a significant increase in the equilibrium degree of swelling of the hydrogels and a decrease in the hydrogel phase-transition temperature from the swollen phase to the shrunken phase.

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Biomedical Applications of Laponite®-Based Nanomaterials and Formulations

Samoylenko

Korotych

Manilo

et al. 2021

Springer Proceedings in Physics

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Temperature sensitive hydrogels cross-linked by magnetic LAPONITE® RD®: effects of particle magnetization

Abstract: The work discusses the synthesis and the properties of magnetite modified Laponite® RD platelets (Lap). Magnetized Lap (mLap) nanoparticles were synthesized by a co-precipitation method with different weight ratios X=...

Cited by 4 publications

References 51 publications

Laponite/magnetite nanoparticles including waterborne latexes and effect of conditions for stable composite latexes

Laponite/magnetite nanoparticles including waterborne latexes and effect of conditions for stable composite latexes

Cross-Linked Hydrogels Based on PolyNIPAAm and Acid-Activated Laponite RD: Swelling and Tunable Thermosensitivity

Biomedical Applications of Laponite®-Based Nanomaterials and Formulations

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