A novel shape-controlled synthesis of bifunctional organic polymeric nanoparticles

Doğan, Fati̇h; Temizkan, Kevser; Kaya, İsmet

doi:10.1016/j.polymer.2015.06.007

Cited by 15 publications

(6 citation statements)

References 44 publications

(32 reference statements)

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“…In the I 2 doping process, the electron‐withdrawing I 2 contact with electron‐discharging nitrogen and aromatic π system forms a charge transfer complex between them. This increases the number of polarons (=CH−N + −) and I 3 − counter ions in the oligoesters system [66] . The coordination mode of I 2 with phenyl ring and nitrogens are shown in SI.22.…”

Section: Resultsmentioning

confidence: 98%

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection

et al. 2023

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Azine‐based monomer and its three oligoesters were synthesized, characterized with IR, UV, GC‐MS, GPC, 1H NMR, 13C{1H} NMR, 31P NMR and applied to chemosensor applications. In the chemosensor study, fluorophores show selective and sensitive responses with Fe2+ ions in the DMF/H2O solution (1 : 1, pH: 7.4, fluorophore: 5 μM). The quenching of fluorescence intensity with the addition of Fe2+ ion gives the correlation coefficient (R2) value above 0.99286, exhibiting good binding stoichiometry nature of fluorophores with Fe2+ than the oligoesters. The high detecting capability of oligoesters is further ascertained by its higher LOD than the monomer (5.05×10−7). The binding constant values of fluorophores obtained from the Benesi‐Hildebrand plot show that the oligoesters have a higher binding ability (1.0012–1.0025 M−1) with Fe2+ ion than the monomer (1.0011 M−1). The conductivity nature of the oligoester gradually increased with the contact time of iodine. After 96hr of iodine doping, EMDAP exhibits higher conductivity (1.98×10−3 Scm−1) than the other oligoesters due to higher electron‐density nitrogen atoms in the structure. The EMDOP shows high dielectric constant value because of its π‐π interaction, loosely attached π electrons and high dipole moment values. All these experimental results are validated with the theoretical (DFT) approach by optimizing the structure of the fluorophore with B3LYP/6‐311++G(d,p) level basis set. The DFT approach also explains the mechanism of fluorescence quenching and the exact binding sites of fluorophores with Fe2+ ions.

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Section: Resultsmentioning

confidence: 98%

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection

et al. 2023

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“…When the electron pulling I 2 coordinate with the electron emitting nitrogen produces polarons and I 3 − counter ions in the oligoester structure. This is due to the formation of charge transfer complex by azine nitrogen and aromatic π e − system of oligoesters with dopant I 2 [74] . The mode of I 2 coordination with nitrogens of oligoesters and phenyl rings are shown in SI 20.…”

Section: Resultsmentioning

confidence: 98%

“…This is due to the formation of charge transfer complex by azine nitrogen and aromatic π e À system of oligoesters with dopant I 2 . [74] The mode of I 2 coordination with nitrogens of oligoesters and phenyl rings are shown in SI 20. This polarons increases the electron mobility in oligoester chain and enhances the electrical conductivity.…”

Section: Conductivitymentioning

confidence: 99%

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.

et al. 2023

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A novel azine monomer and its oligomeric esters were synthesized and applied to chemosensor applications. Among the series of metal ions, the fluorophores show selective and sensitive “turn off” response towards Ag+ ions. The stoichiometry and binding constant are calculated using the Stern‐Volmer equation and Benesi‐Hildebrand plots, respectively. The fluorophore‘s capability for quantitative analysis of Ag+ ions was studied. The quenching mechanism LMCT and PET behind the “turn off” response was confirmed. The conductivity nature of iodine doped and undoped oligoesters was studied. The dielectric behaviour of oligoesters was also studied to determine the possibility of oligoesters in making passive components such as capacitors and resistors. All the results obtained from chemosensor and electrical studies were validated using a theoretical (DFT) analysis using B3LYP/6–311++G(d,p) level basis set.

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“…The diameter of the particles could be controlled from a couple of tens of nanometers to the sub-micrometer range by changing the reaction solvent, monomer concentration, and monomer ratio. Compared with previously reported carbon-based nanoparticles, ,,− the black nanoparticles presented in this paper have several advantages: (1) the nanoparticles can be prepared in a short amount of time by the simple method of one-pot microwave irradiation; (2) the obtained nanoparticles are a monodispersed spherical shape, and the size is controllable from a couple of tens of nanometers to the sub-micrometer range; (3) the nanoparticles can be carbonized (blackened) in a solvent at a comparably lower temperature; (4) the polymer particles could be dispersed in various solvents such as water, N , N -dimethylformamide, methanol, ethanol, THF, and chloroform without any additives or surface treatments; and (5) the nanoparticles exhibit selective reflectivity for near-infrared light.…”

Section: Discussionmentioning

confidence: 99%

Monodisperse Surface-Charge-Controlled Black Nanoparticles for Near-Infrared Shielding

Hano

Takafuji

Noguchi

et al. 2019

ACS Appl. Nano Mater.

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A simple and quick preparation of black polymer nanoparticles by the microwave-assisted polymerization of 1,5-dihydroxynaphthalene and 1,3,5-trimethyl-1,3,5-triazinane under high temperature and pressure was demonstrated. The average diameter of the nanoparticles ranged from 20 to 700 nm, depending on the preparation conditions such as reaction solvent, monomer concentrations, and monomer ratio in the seed mixture. The surface charge of the nanoparticles was also determined by the monomer ratio used in the seed mixture. The nanoparticles could be dispersed in polar solvents such as water, methanol, and ethanol, probably because the phenolic hydroxyl groups and primary/secondary amine groups remained on the surface of the nanoparticles. The reflectance spectroscopic measurements from 200 to 2200 nm showed that the nanoparticles expressed selective reflectivity of NIR wavelengths. The absorption and reflectance properties could be tuned by microwave-assisted wet calcination of the nanoparticles. The particles were initially dark green, but when the particles were heated at 250 °C for 10 min in ethylene glycol, they absorbed light in the UV–visible region (reflectance was less than 3% from 200 to 750 nm), indicating the color of the particles had become perfectly black. Reflection in the NIR region from 1250 to 2150 nm, however, remained more than 50% after calcination. The calcinated nanoparticles could be dispersed in water, and the surface charge was positive at lower pH and negative at higher pH. The isoelectric point shifted slightly from 5.3 to 4.4 after wet calcination at 250 °C. The amount of nitrogen in the nanoparticles decreased remarkably after calcination; therefore, the phenolic hydroxyl groups must have remained on the surface of the calcinated nanoparticles preferentially to the amine groups. These black nanoparticles with selective reflectance in the NIR region could be applied to black heat-shielding materials such as paints for buildings and automobiles.

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A novel shape-controlled synthesis of bifunctional organic polymeric nanoparticles

Cited by 15 publications

References 44 publications

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.

Monodisperse Surface-Charge-Controlled Black Nanoparticles for Near-Infrared Shielding

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A novel shape-controlled synthesis of bifunctional organic polymeric nanoparticles

Cited by 15 publications

References 44 publications

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe2+ ion detection

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe2+ ion detection

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag+ Ion Detection and Their Theoretical Investigations.

Monodisperse Surface-Charge-Controlled Black Nanoparticles for Near-Infrared Shielding

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Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.