Nanocapsules with “invisible” walls

Dergunov, Sergey A.; Miksa, Beata; Ganus, Bill; Lindner, Ernő; Pinkhassik, Eugene

doi:10.1039/b918845b

Cited by 50 publications

(95 citation statements)

References 19 publications

(6 reference statements)

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“…Aqueous dispersions of nanocapsules are stabilized by sodium dodecyl sulfate (SDS). Transmission and scanning electron microscopy (TEM and SEM) images showed spherical structures (Figure c, d, e) similar to previously reported liposome‐ and surfactant‐templated nanocapsules ,,. GNPs were well‐distributed in hollow nanocapsules.…”

Section: Figuresupporting

confidence: 86%

“…The nanocapsules used here are prepared by directed assembly using bilayers of surfactant vesicles as templates . We have recently shown that polymer nanocapsules with nanometer‐thin walls revealed unusual properties, for example, ultra‐fast transport of ions while ensuring the long‐term retention of molecules larger than pores . Due to the small thickness of the walls, these hollow capsules have high payload capacity.…”

Section: Figurementioning

confidence: 99%

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Tuning Optical Properties of Encapsulated Clusters of Gold Nanoparticles through Stimuli‐Triggered Controlled Aggregation

Dergunov

Kim

Shmakov

et al. 2016

Chemistry A European J

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Gold nanoparticles entrapped in the hollow polymer nanocapsules undergo pH-mediated controlled aggregation. Encapsulated clusters of nanoparticles show absorbance at higher wavelengths compared with individual nanoparticles. The size of the aggregates is controlled by the number of nanoparticles entrapped in individual nanocapsules. Such controlled aggregation may permit small biocompatible nanoparticles exhibit desirable properties for biomedical applications that are typically characteristic of large nanoparticles.

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Section: Figuresupporting

confidence: 86%

Section: Figurementioning

confidence: 99%

Tuning Optical Properties of Encapsulated Clusters of Gold Nanoparticles through Stimuli‐Triggered Controlled Aggregation

Dergunov

Kim

Shmakov

et al. 2016

Chemistry A European J

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“…To address these conflicting requirements the indicator dyes can be encapsulated into porous nanocapsules [37]. The~0.8 nm thin walls of the nanocapsules do not slow the mass transport of hydronium ions [38] but the nanocapsules themselves have almost no mobility inside of a gel, i.e., no leaching of the dye and no drift in the sensor signal is expected.…”

Section: Discussionmentioning

confidence: 99%

Ion‐Selective Optodes in a Sampling Capillary for Tear Fluid Analysis

Lindner¹,

Bordelon²,

Kim³

et al. 2011

Electroanalysis

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Plasticized PVC membrane-based potassium or sodium ion-selective optodes were incorporated into sampling capillaries in combination with sol-gel-based hydrogen ion-selective optodes for the sampling and analysis of minute tear fluid samples. The performance characteristic of the K + /pH and Na + /pH sensor arrays were optimized for an adequate dynamic response range, sensitivity, stability, and response time. The precision and accuracy of the combined sampling/measurement system was evaluated both in stopped flow and continuous flow modes using aqueous standard solutions. By using a two point calibration protocol, with pH standards bracketing the sample, the pH of 20 mL pooled human tear samples could be determined with a precision less than AE 0.03 pH units. Errors in the pH measurements have a significant influence on the attainable precision and accuracy of the ion-exchange-based K + and Na + optodes. Nevertheless, the results of the quantitative assessment of the K + and Na + concentrations in "check" standards and pooled human tear fluid samples were within AE 5 % of the nominal values or of the results of the determinations with atomic absorption spectrophotometry. Cationic surfactants in artificial tear drops were found to interfere with the K + and Na + optode responses. No interference was detected in the presence of anionic and nonionic surfactants.

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“…To gain insights into the kinetics of transport through the shells of bilayertemplated NCs, the rates of protonation and deprotonation of encapsulated pH-sensitive dyes were investigated using stopped flow technique coupled with absorbance and fluorescence spectroscopy [56]. In these experiments, an aqueous suspension of surfactant-stabilized NCs containing pyranine or bromophenol blue was rapidly mixed with a base or an acid followed by measuring fluorescence increase for the deprotonated form of pyranine or absorbance decrease for the protonated form of bromophenol blue.…”

Section: Synthesis and Characterization Of Nanocapsulesmentioning

confidence: 99%