Replication of anisotropic dispersed particulates and complex continuous templates

Shchepelina, Olga; Kozlovskaya, Veronika; Singamaneni, Srikanth; Kharlampieva, Eugenia; Tsukruk, Vladimir V.

doi:10.1039/c0jm00049c

Cited by 57 publications

(54 citation statements)

References 170 publications

(179 reference statements)

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“…[30] It can be noted also that current studies are useful to further extend the application of a variety of PDT [48] agents, to investigate the stability of molecules, and can be also used for practical applications, particularly those related to controlled permeability changes. [49] Furthermore, the studied phenomena are of use for recent developments in the area of bio-inspired colloidal systems, [44] multicompartment [50,51] and anisotropic constructs, [52,53] and planar polymeric films. [54 -58] The organic molecules reported here can be used for reducing the threshold of activation of microcapsules, [59] although metal nanoparticles [60] as well as carbon nanotubes [61] still remain attractive alternatives because they are used not only for remote release but also for improving mechanical properties of microcapsules.…”

Section: Resultsmentioning

confidence: 99%

Raman imaging and photodegradation study of phthalocyanine containing microcapsules and coated particles

Bratashov

Mašić

Yashchenok

et al. 2011

J Raman Spectroscopy

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We present the results of using Raman molecular imaging and atomic force microscopy (AFM) investigation of the composition, stability, and photodegradation of polyelectrolyte multilayer microcapsules and coated microparticles containing copper-phthalocyanine and iron-phthalocyanine. The influence of laser light on degradation of these phthalocyanine dyes embedded in the walls of polyelectrolyte multilayer capsules and shells of microparticles was studied by both AFM and Raman molecular imaging, but only the latter technique gave information on dynamics of photodegradation. Raman peak assignment was performed according to theoretical calculations. The degradation rate of phthalocyanine dyes is estimated from Raman signal measurements and a model is proposed to account for the degradation rate. Practical applications of our approach are outlined.

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Section: Resultsmentioning

confidence: 99%

Raman imaging and photodegradation study of phthalocyanine containing microcapsules and coated particles

Bratashov

Mašić

Yashchenok

et al. 2011

J Raman Spectroscopy

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“…[5][6][7][8] Successful demonstration of layer-by-layer (LbL) microcapsules ignited intense efforts focused on the construction of a variety of spherical hollow structures. [9][10][11] Recently, significant progress has also been made in fabrication of more complex microcapsules such as multicompartmental capsules for multicomponent delivery. [12] However, to date only rare examples of anisotropic (nonspherical) microcapsules have been demonstrated despite the fact that anisotropic shapes play a critical role in organization of synthetic and natural structures into complex hierarchical assemblies.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Micro‐ and Nano‐Capsules

Shchepelina

Kozlovskaya

Kharlampieva

et al. 2010

Macromol. Rapid Commun.

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In this work, we introduce anisotropically shaped, ultrathin micro- and nano-capsules fabricated by layer-by-layer approach. The original cubic and tetrahedral shapes of the template particles were replicated to produce hollow capsules with well-defined edges. Introducing tannic acid as a component of LbL shells resulted in enhanced chemical stability of these hollow polymer structures under a wide pH range due to high pK(a) value. Computational studies demonstrated increased mechanical stability of the anisotropic capsules under osmotic pressure variation due to sharp edges and vertices acting as a reinforcing frame in contrast to spherical microcapsules that undergo random buckling.

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“…16,18,19 Furthermore, the non-spherical shape of the capsules oen lose aer removing the templates due to high residual stresses or osmotic pressures. 16,18,19 In terms of such challenges, PDA coating is valuable due to its capability to form a conformal coating layer on particulate templates with any kinds of shapes. 5,6,[9][10][11][12] Even so, PDA capsules with an anisotropic shape have barely been reported.…”

Section: 17mentioning

confidence: 99%

Anisotropic polydopamine capsules with an ellipsoidal shape that can tolerate harsh conditions: efficient adsorbents for organic dyes and precursors for ellipsoidal hollow carbon particles

Zhang

et al. 2017

RSC Adv.

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Polymeric capsules often buckle, collapse or even break when being processed in the dried state into other materials under high temperature and pressure due to moderate mechanical rigidity. In the case of nonspherical capsules, to keep their precious anisotropic morphology intact under harsh conditions is even more challenging since the whole surface of such kinds of capsules does not experience the same stress or strain due to the different surface curvatures. In the current work, we reported a strategy to prepare polydopamine (PDA) capsules with an ellipsoidal shape and enhanced mechanical rigidity using polystyrene ellipsoids as the sacrificial anisotropic templates. Bio-inspired oxidation induced selfpolymerization of dopamine can form conformal PDA coatings on polystyrene ellipsoids of various aspect ratios and sizes. Several strategies have been exploited to increase the thickness of the PDA shell, among which, iterating PDA coating produces ellipsoidal PDA capsules with a thick and robust shell.These ellipsoidal PDA capsules can survive carbonization at temperatures as high as 800 C and were directly turned into N-doped carbon capsules with a well-defined ellipsoidal shape, excluding the necessity of removing the sacrificial templates after carbonation. Furthermore, the rigid PDA ellipsoidal capsules are efficient adsorbents for organic dyes in contaminated water and have impressive adsorption efficiencies as high as 200 mg g À1.

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Replication of anisotropic dispersed particulates and complex continuous templates

Cited by 57 publications

References 170 publications

Raman imaging and photodegradation study of phthalocyanine containing microcapsules and coated particles

Raman imaging and photodegradation study of phthalocyanine containing microcapsules and coated particles

Anisotropic Micro‐ and Nano‐Capsules

Anisotropic polydopamine capsules with an ellipsoidal shape that can tolerate harsh conditions: efficient adsorbents for organic dyes and precursors for ellipsoidal hollow carbon particles

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