Thermosensitive ternary core–shell nanocomposites of polystyrene, poly(N-isopropylacrylamide) and polyaniline

Vretik, L. O.; Noskov, Yu. V.; Ogurtsov, N.A.; Николаева, О. А.; Shevchenko, A. V.; Marynin, Andriy; Kharchuk, M.S.; Chepurna, Oksana; Ohulchanskyy, Tymish Y.; Pud, A. A.

doi:10.1007/s13204-020-01424-9

Cited by 10 publications

(14 citation statements)

References 48 publications

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“…From these micrographs, it is observed that the CSA(PANi) particles are spherical shaped (≤1 μm) before addition of HEMs and aggregate to form agglomerates on addition of HEMs (≥2 μm). Similar nature in agglomeration is also observed for some functionalized PANi in the literature 31,32 …”

Section: Resultssupporting

confidence: 86%

“…Similar nature in agglomeration is also observed for some functionalized PANi in the literature. 31,32 2.4 | FTIR spectroscopy Figure 3 showed the FTIR spectra of the samples in pellet form. Seven major vibrational peaks (1588, 1492, 1304, 1248, 1122, 824, 618 cm −1 ) are observed in the fingerprint region.…”

Section: Field Emission Scanning Electron Microscopymentioning

confidence: 99%

“…33 The peak observed at 1122 cm −1 is assigned to vibrations of the charged polymer (-N + =) structure namely, a hole (Q = NH + − B) or polaron (radical cation; B − NH +• − B). 16,32 The peak at 824 cm −1 is due to C-H out-of-plane bending of two adjacent hydrogen atoms at 1,4-disubstituted benzene unit. 34 The peak observed at 618 cm −1 in the spectra is due to hydrogen sulfate counter ions.…”

Section: Field Emission Scanning Electron Microscopymentioning

confidence: 99%

See 2 more Smart Citations

Understanding of mechanistic perspective in sensing of energetic nitro compounds through spectroscopic and electrochemical studies

Ture

Patil

Yelamaggad

et al. 2021

J of Applied Polymer Sci

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Understanding the probable mechanism of detection plays a significant role in selecting a particular fluorophore for the detection of the complicated and low volatile analyte namely, nitroaromatic and non‐aromatic high energy materials (HEMs) in the development of detection devices when compared with the existing techniques. The fluorescence quenching employing conducting polymers‐based response of HEMs have attained great significance in recent times. Amongst all conducting polymers, functionalized polyaniline can act as a fluorophore in quenching studies. This report also reveals the importance of studying electrochemical methods associated with the changes observed in the oxidation potential and its resemblance with fluorescence quenching study in establishing the probable mechanism associated with the sensing study of HEMs (viz., RDX, PETN, CL‐20 and RDX: CL‐20 Cocrystal). FTIR and resonance Raman characterization helped us to understand the interaction between nitro groups present in HEMs with benzenoid unit or polaronic or bipolaronic nitrogen of camphor sulfonic acid doped polyaniline (CSA[PANi]). Employing Stern Volmer plot, the efficiency of quenching and quenching mechanisms of complex structure formed between the fluorophore and HEMs is understood.

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Section: Resultssupporting

confidence: 86%

Section: Field Emission Scanning Electron Microscopymentioning

confidence: 99%

Section: Field Emission Scanning Electron Microscopymentioning

confidence: 99%

See 1 more Smart Citation

Understanding of mechanistic perspective in sensing of energetic nitro compounds through spectroscopic and electrochemical studies

Ture

Patil

Yelamaggad

et al. 2021

J of Applied Polymer Sci

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“…Synthesis of the Latex of the Binary PS@PNIPAM Nanoparticles: First, the core PS nanoparticles containing 10 wt.% of PNIPAM were prepared through miniemulsion polymerization route. [20,62,63] In particular, 0.2 g of NIPAM, 0.01 g of NaH 2 PO 4 × H 2 O, and 0.2 g of SDS were dissolved in 90 g of H 2 O at room temperature. This solution was heated to 50 °C and 1.8 g of styrene was slowly added dropwise over 20 min with a syringe under continuous stirring (1200 rpm) using a magnetic stirrer.…”

Section: Methodsmentioning

confidence: 99%

“…A similar effect was observed for polyaniline (PANI) or poly(N-methylaniline) in the PNIPAM-based macrosized hydrogels, [51,52] or in the PS@PNIPAM-PANI latexes. [20] However, the reversibility of the temperature transitions of the NC5 and NC7 ternary latexes is complicated by an appearance of the hysteresis in the nanoparticle size recovery under cooling. In particular, unlike the binary PS@PNIPAM latex, NC5 and NC7 show the hysteresis, which is slightly enhanced by increasing the PEDOT content in the PNIPAM shells (Figure 8b-d), which may be associated with some deceleration in relaxation of the intermolecular interactions between the PNIPAM and doped PEDOT units discussed above.…”

Section: Dls Measurementsmentioning

confidence: 99%

Dual Stimuli‐Responsive Ternary Core‐Shell Polystyrene@Pnipam‐Pedot Latexes

Vretik,

Noskov,

Chepurna

et al. 2023

Part & Part Syst Charact

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The ability of stimuli‐responsive materials to respond to external stimuli depends on their intra‐ and intermolecular interactions, which, in turn, are governed by changes in the material composition. Here, the importance of these factors for new heat and light‐sensitive latexes of core‐shell nanoparticles is reported with the polystyrene core, the poly(N‐isopropylacrylamide) (PNIPAM) shell containing doped poly(3,4‐ethylenedioxythiophene) (PEDOT). It is found that hydrogen bonding, C═O─π aromatic, hydrophilic‐hydrophobic interactions in the shell cause conformational changes in PNIPAM similar to those occurring in the PNIPAM coil‐globule transition. Depending on the EDOT:PS@PNIPAM feed ratio and the PEDOT content in PNIPAM shells, these interactions and changes affect nanoparticle sizes and are responsible for shifting the lower critical solution temperature (LCST) of PNIPAM in the shell from 32.1 to 33.9 °C. The core‐shell morphology of nanoparticles is maintained only for latexes with EDOT feed to ≈9 wt.%. At the higher EDOT content, PNIPAM shells are destroyed. Synthesized PS@PNIPAM‐PEDOT latexes demonstrate temperature‐dependent behavior and produce a photothermal effect under NIR irradiation, which allows for a rise of their temperature above LCST. This dual stimuli (heat and light) responsiveness suggests an important possibility for these latexes to be used for drug or diagnostic agent delivery.

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Optimizing synthesis and application of an enhanced oil recovery agent: stability assessment of the optimized nanostructured PNIPAM/PS core–shell polymer using a developed DLVO-based model

Mohammadipour,

Amiri,

Dashti

et al. 2024

Colloid Polym Sci

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To improve the efficiency of hydrophilic polymers in oil reservoirs, a method encapsulates the polymer within a protective shell, safeguarding the core polymer and enabling controlled release in demanding, high-temperature conditions. Poly(N-isopropylacrylamide) nanoparticles are encapsulated with Poly styrene shells through emulsion polymerization in this study.Varying the amounts of shell monmer and crosslinking agents resulted thick, sphere-shaped shells with homogeneous morphology, which protects the core polymer and enabling controlled release. Structural and morphological properties are characterized using Fourier-transform infrared spectroscopy (FTIR), Proton nuclear magnetic resonance (H 1 NMR), Dynamic Light Scattering (DLS), and Scanning electron microscope (SEM) imaging. Increasing the styrene amounts lead to larger particles, while higher crosslinker amounts result in a narrower size distribution. Thermal testing indicates heat resistance up to 300°C, suitable for EOR applications. Rheological tests determine an optimal 30-day release for the PNIPAM core, with the CS polymer showing increased viscosity under harsh conditions. DLVO theory and experimental results demonstrate good stability and energy barriers at room temperature, but decreased stability and increased agglomeration at higher temperatures. Thickening the styrene shell leads to particle agglomeration and unsuitable stability. The study confirms the effectiveness of the model in analyzing CS colloidal latex systems.

show abstract

Thermosensitive ternary core–shell nanocomposites of polystyrene, poly(N-isopropylacrylamide) and polyaniline

Cited by 10 publications

References 48 publications

Understanding of mechanistic perspective in sensing of energetic nitro compounds through spectroscopic and electrochemical studies

Understanding of mechanistic perspective in sensing of energetic nitro compounds through spectroscopic and electrochemical studies

Dual Stimuli‐Responsive Ternary Core‐Shell Polystyrene@Pnipam‐Pedot Latexes

Optimizing synthesis and application of an enhanced oil recovery agent: stability assessment of the optimized nanostructured PNIPAM/PS core–shell polymer using a developed DLVO-based model

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