Biocompatible Magnetite Nanoparticles Trapped at the Air/Water Interface

Stefaniu, Cristina; Chanana, Munish; Wang, Dayang; Новиков, Д. В.; Brezesinski, Gerald; Möhwald, Helmuth

doi:10.1002/cphc.201000783

Cited by 26 publications

(34 citation statements)

References 44 publications

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“…The authors showed that nanoparticles had robust colloidal stability and excellent biocompatibility. Plus, the aggregation‐disaggregation of the NPs was reversible and adjustable by temperature control 193–195. In a further study, it was shown that nanoparticles thus functionalized had a good balance of interchangeable hydrophobic and hydrophilic characters that might explain their ability to cross cell membranes 196…”

Section: Micro‐/nanoscopic Surface Functionalizationmentioning

confidence: 97%

Catechol‐Based Biomimetic Functional Materials

Saiz‐Poseu²,

et al. 2012

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Abstract.Catechols are found in nature taking part in a remarkably broad scope of biochemical processes and functions. Though not exclusively, such versatility may be traced back to several properties uniquely found together in the o -dihydroxyaryl chemical function; namely, its ability to establish reversible equilibria at moderate redox potentials and pHs and to irreversibly cross-link through complex oxidation mechanisms; its excellent chelating properties, greatly exemplifi ed by, but by no means exclusive, to the binding of Fe 3 + ; and the diverse modes of interaction of the vicinal hydroxyl groups with all kinds of surfaces of remarkably different chemical and physical nature. Thanks to this diversity, catechols can be found either as simple molecular systems, forming part of supramolacular structures, coordinated to different metal ions or as macromolecules mostly arising from polymerization mechanisms through covalent bonds. Such versatility has allowed catechols to participate in several natural processes and functions that range from the adhesive properties of marine organisms to the storage of some transition metal ions. As a result of such an astonishing range of functionalities, catechol-based systems have in recent years been subject to intense research, aimed at mimicking these natural systems in order to develop new functional materials and coatings. A comprehensive review of these studies is discussed in this paper.

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Section: Micro‐/nanoscopic Surface Functionalizationmentioning

confidence: 97%

Catechol‐Based Biomimetic Functional Materials

Saiz‐Poseu²,

et al. 2012

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“…Iron (hydr) oxide particles dispersed in the aqueous subphase may adsorb and accumulate on various soft films at air/aqueous subphase interfaces [13][14][15][16][17]. To determine the amount and structure of iron aggregates at Langmuir monolayers on molecular length scales, we employed X-ray reflectivity [18][19][20][21][22][23], fluorescence spectroscopy [24][25][26][27][28][29] and grazing incidence X-ray diffraction (GIXD) techniques, using synchrotron radiation.…”

Section: Introductionmentioning

confidence: 99%

Amorphous iron-(hydr) oxide networks at liquid/vapor interfaces: In situ X-ray scattering and spectroscopy studies

Wang

Pleasants

et al. 2012

Journal of Colloid and Interface Science

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“…The NPs occupy this free surface until the maximum surface pressure is reached, as previously reported for their adsorption at the bare air-water interface. 6,7 The fact that the NPs occupy 10% of the interface in the mixed monolayer was proved by in situ TRXF measurements. Thus, as depicted in Fig.…”

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confidence: 98%

Polymer-capped magnetite nanoparticles change the 2D structure of DPPC model membranes

2012

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The interaction of biocompatible and stimuli-responsive Fe 3 O 4 nanoparticles (NPs) with DPPC model membranes was studied at the air-water interface. The pure NPs, pure DPPC and mixed DPPC-NP Langmuir layers have been characterized in situ by compression-expansion isotherms, infrared reflection-absorption spectrometry (IRRAS), grazing incidence X-ray diffraction (GIXD), total reflection X-ray fluorescence (TRXF), Brewster angle microscopy, and by atomic force microscopy after transfer onto a solid support. When dispersed in aqueous solution, the NPs are able to penetrate the phospholipid monolayer and to occupy a certain part of the interface defined by their own surface activity. The study reveals a largely phase separated system which actually masks an important interplay between the two compounds. Detailed GIXD measurements prove that the NPs are able to change the DPPC monolayer structure in a highly cooperative way by inducing a tighter in-plane packing. As IRRAS additionally supports, the effective size of the phospholipid polar head group is reduced due to partial dehydration and reorientation. The most surprising observation is the rigidification of the DPPC-NPs composite in a large range of surface pressures. Above the critical pressure, the phase separated NPs are squeezed out but the ones interacting with the DPPC molecules stay in the layer up to much higher lateral pressures. The interactions between NPs and DPPC stabilize the NPs at the interface. Only at very high pressures, all NPs are squeezed out. The amount of NPs in the monolayer has been quantified by TRXF. The desorption process is kinetically hindered.

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Biocompatible Magnetite Nanoparticles Trapped at the Air/Water Interface

Cited by 26 publications

References 44 publications

Catechol‐Based Biomimetic Functional Materials

Catechol‐Based Biomimetic Functional Materials

Amorphous iron-(hydr) oxide networks at liquid/vapor interfaces: In situ X-ray scattering and spectroscopy studies

Polymer-capped magnetite nanoparticles change the 2D structure of DPPC model membranes

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