Magnetic Bio/Nanoreactor with Multilayer Shells of Glucose Oxidase and Inorganic Nanoparticles

Fang, Ming; Grant, Patrick S.; McShane, Michael J.; Sukhorukov, Gleb B.; Golub, Vladimir; Lvov, Yuri

doi:10.1021/la025731m

Cited by 134 publications

(100 citation statements)

References 23 publications

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“…Structures of similar architecture have been obtained by templating water-in-oil emulsions [31,32]. Multilayer shells consisting of alternating positive and negative polyelectrolytes and/or nanoparticles have also been prepared by using layer-by-layer assembly techniques, with the final hollow shells being obtained by removal of the central, sacrificial colloidal particles [33,34]. Loxley and Vincent [35] developed a new way of preparing polymeric capsules with liquid cores based on a phase separation of the polymer within the templated emulsion.…”

Section: Colloidosomesmentioning

confidence: 99%

Two-dimensional matter: order, curvature and defects

Bowick

Giomi

2009

Advances in Physics

329

458

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Many systems in nature and the synthetic world involve ordered arrangements of units on two-dimensional surfaces. We review here the fundamental role payed by both the topology of the underlying surface and its Gaussian curvature. Topology dictates certain broad features of the defect structure of the ground state but curvature-driven energetics controls the detailed structured of ordered phases. Among the surprises are the appearance in the ground state of structures that would normally be thermal excitations and thus prohibited at zero temperature. Examples include excess dislocations in the form of grain boundary scars for spherical crystals above a minimal system size, dislocation unbinding for toroidal hexatics, interstitial fractionalization in spherical crystals and the appearance of well-separated disclinations for toroidal crystals. Much of the analysis leads to universal predictions that do not depend on the details of the microscopic interactions that lead to order in the first place. These predictions are subject to test by the many experimental soft and hard matter systems that lead to curved ordered structures such as colloidal particles self-assembling on droplets of one liquid in a second liquid. The defects themselves may be functionalized to create ligands with directional bonding. Thus nano to meso scale superatoms may be designed with specific valency for use in building supermolecules and novel bulk materials. Parameters such as particle number, geometrical aspect ratios and anisotropy of elastic moduli permit the tuning of the precise architecture of the superatoms and associated supermolecules. Thus the field has tremendous potential from both a fundamental and materials science/supramolecular chemistry viewpoint. Contents

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Section: Colloidosomesmentioning

confidence: 99%

Two-dimensional matter: order, curvature and defects

Bowick

Giomi

2009

Advances in Physics

329

458

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“…33 The frequency change of the resonator with the number of polyelectrolyte and nanoparticle layers is presented in Fig. 2.…”

Section: Qcm Study Of the Planar Nanocomposite Films By Lbl Adsorptionmentioning

confidence: 99%

Magnetic/gold nanoparticle functionalized biocompatible microcapsules with sensitivity to laser irradiation

Gorin

Портнов

Inozemtseva

et al. 2008

Phys. Chem. Chem. Phys.

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123

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Nanocomposite microcapsules with both gold and magnetite nanoparticles in the shell were prepared in a layer-by-layer procedure using biocompatible polyelectrolytes and nanoparticles. The process of a nanocomposite multilayer formation was investigated using a quartz crystal microbalance (QCM). In addition, nanocomposite microcapsules were characterized by atomic force microscopy (AFM), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX). It is found that the amount of adsorbed nanoparticles is similar for nanoparticles of various sizes, while the concentration of gold nanoparticles in the shell is higher for smaller nanoparticles. Adsorption of gold nanoparticles is found to be more effective than adsorption of magnetic nanoparticles. Multifunctionality of microcapsules is manifested by dual: magnetic and optical responses. Iron oxide nanoparticles embedded in the microcapsule shell allowed for control over capsules positioning by external magnetic fields. Furthermore, the nanocomposite microcapsules could be opened by laser irradiation; these results are of interest for medical and biological applications.

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“…Additionally, it was found that the introduction of magnetic nanoparticles enhances the effectiveness of the nanoreactor and also combines the benefits of magnetic properties with high surface area. 33 Also, QCM measurements with energy dissipation have been employed to track the adsorption of TiO 2 nanoparticles onto silica in order to evaluate its contamination potential in natural water sub-surface environments. The authors found that water characteristics (e.g.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of cobalt ferrite nanoparticles within layer-by-layer films: a kinetic study carried out using quartz crystal microbalance

Alcantara

Paterno

Afonso

et al. 2011

Phys. Chem. Chem. Phys.

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The paper reports on the successful use of the quartz crystal microbalance technique to assess accurate kinetics and equilibrium parameters regarding the investigation of in situ adsorption of nanosized cobalt ferrite particles (CoFe 2 O 4 -10.5 nm-diameter) onto two different surfaces. Firstly, a single layer of nanoparticles was deposited onto the surface provided by the gold-coated quartz resonator functionalized with sodium 3-mercapto propanesulfonate (3-MPS). Secondly, the layer-by-layer (LbL) technique was used to build multilayers in which the CoFe 2 O 4 nanoparticle-based layer alternates with the sodium sulfonated polystyrene (PSS) layer. The adsorption experiments were conducted by modulating the number of adsorbed CoFe 2 O 4 /PSS bilayers (n) and/or by changing the CoFe 2 O 4 nanoparticle concentration while suspended as a stable colloidal dispersion. Adsorption of CoFe 2 O 4 nanoparticles onto the 3-MPS-functionalized surface follows perfectly a first order kinetic process in a wide range (two orders of magnitude) of nanoparticle concentrations. These data were used to assess the equilibrium constant and the adsorption free energy. Alternatively, the Langmuir adsorption constant was obtained while analyzing the isotherm data at the equilibrium. Adsorption of CoFe 2 O 4 nanoparticles while growing multilayers of CoFe 2 O 4 /PSS was conducted using colloidal suspensions with CoFe 2 O 4 concentration in the range of 10 À8 to 10 À6 (moles of cobalt ferrite per litre) and for different numbers of cycles n = 1, 3, 5, and 10. We found the adsorption of CoFe 2 O 4 nanoparticles within the CoFe 2 O 4 /PSS bilayers perfectly following a first order kinetic process, with the characteristic rate constant growing with the increase of CoFe 2 O 4 nanoparticle concentration and decreasing with the rise of the number of LbL cycles (n). Additionally, atomic force microscopy was employed for assessing the LbL film roughness and thickness. We found the film thickness increasing from about 20 to 120 nm while shifting from 3 to 10 CoFe 2 O 4 /PSS bilayers, using the 8.9 Â 10 À6 (moles of cobalt ferrite per litre) suspension.

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Magnetic Bio/Nanoreactor with Multilayer Shells of Glucose Oxidase and Inorganic Nanoparticles

Cited by 134 publications

References 23 publications

Two-dimensional matter: order, curvature and defects

Two-dimensional matter: order, curvature and defects

Magnetic/gold nanoparticle functionalized biocompatible microcapsules with sensitivity to laser irradiation

Adsorption of cobalt ferrite nanoparticles within layer-by-layer films: a kinetic study carried out using quartz crystal microbalance

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