V2O5 nanowires with an intrinsic iodination activity leading to the formation of self-assembled melanin-like biopolymers

Natálio, Filipe; André, Rute; Pihan, Sascha A.; Humanes, Madalena; Wever, Ron; Tremel, Wolfgang

doi:10.1039/c1jm11811k

Cited by 21 publications

(27 citation statements)

References 62 publications

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“…The annealing step leads to catechol oxidation and ultimately to the enhanced cross‐linking of the catechol‐polymer/TiO 2 composite. UV–vis spectra showed a broad peak at 320 nm in addition to the peak of nonoxidized catechol around 280 nm, indicating oxidative cross‐linking of the polymer (Figure S9, Supporting Information) …”

Section: Resultsmentioning

confidence: 99%

“…The protein‐based adhesives encountered in the marine mussel Mytilus edulis give an important hint into the strength of the polymer/TiO 2 composite . The catechol groups of the adhesive foot proteins act as “glue” which is responsible for the solidification via metal coordination or oxidative chemical cross‐linking with catechols of neighboring the polymer chains . Catechols are easily oxidized to the quinones at higher temperature (>90 °C) that can undergo a Michael‐type addition with the catechol groups .…”

Section: Resultsmentioning

confidence: 99%

“…This is indicated by ample reports on the adhesive proteins isolated from the marine mussel Mytilus edulis . The DOPA‐polymer self‐polymerizes (similar as mussel proteins) into long‐chain polymers by oxidative chemical cross‐linking, which greatly improves mechanical strength. We demonstrate in this contribution that blending these DOPA‐polymers with a dense, ordered multilayer matrix of metal oxide NPs leads to a nanocomposite with high mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

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High‐Performance TiO₂ Nanoparticle/DOPA‐Polymer Composites

Liaqat

Tahir

Schechtel

et al. 2015

Macromol. Rapid Commun.

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Many natural materials are complex composites whose mechanical properties are often outstanding considering the weak constituents from which they are assembled. Nacre, made of inorganic (CaCO3 ) and organic constituents, is a textbook example because of its strength and toughness, which are related to its hierarchical structure and its well-defined organic-inorganic interface. Emulating the construction principles of nacre using simple inorganic materials and polymers is essential for understanding how chemical composition and structure determine biomaterial functions. A hard multilayered nanocomposite is assembled based on alternating layers of TiO2 nanoparticles and a 3-hydroxy-tyramine (DOPA) substituted polymer (DOPA-polymer), strongly cemented together by chelation through infiltration of the polymer into the TiO2 mesocrystal. With a Young's modulus of 17.5 ± 2.5 GPa and a hardness of 1.1 ± 0.3 GPa the resulting material exhibits high resistance against elastic as well as plastic deformation. A key feature leading to the high strength is the strong adhesion of the DOPA-polymer to the TiO2 nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High‐Performance TiO₂ Nanoparticle/DOPA‐Polymer Composites

Liaqat

Tahir

Schechtel

et al. 2015

Macromol. Rapid Commun.

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“…Watt et al as well as Bothma found that the diameters of sepia melanin granules which are roughly spherical were 100 nm upwards [24,25]. The diameter of the aggregated spherical granules constituting sepia melanin was reported to be about 150 nm [26].…”

Section: Sem Micrographsmentioning

confidence: 99%

Morphological and Chemical Composition Characterization of Commercial Sepia Melanin

Mbonyiryivuze¹,

Nuru²,

Ngom³

et al. 2015

AJN

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Melanins are difficult to characterize because of their intractable chemical properties and the heterogeneity in their structural features. Melanin pigments, in fact, are composed of many different types of monomeric units that are connected through strong carbon-carbon bonds. Its high insolubility and undefined chemical entities are two obstacles in its complete characterization. The morphological characterization and particle size distribution for sepia melanin by Scanning Electron Microscopy (SEM) on surface structure and Transmission Electron Microscopy (TEM) to confirm the morphology obtained from SEM was done. Both results show that Sepia melanin is formed by many aggregates agglomerated together. These aggregates are formed also by small spherical granules with different size distributions that have been determined using image-J software. The small granule diameter obtained from different TEM and SEM micrographs were 100-200nm. EDS reveals that C and O were the most abundant in sepia melanin with concentration average concentrations of about 57% and 24% respectively. The major compositions of sepia melanin are C, O, Na, Cl, while the minor are Mg, Ca, K, S and N. From TEM micrograph at high resolution, it was possible to measure the distance between polymers layers of sepia melanin using image-J software and it was 0.323 nm = 3.23 A.

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“…This reduces pulverization issues associated with bulk materials and consequently improves cycle life. 2 Vanadium oxides and their derivative compounds have attracted special attention because of their outstanding physical and chemical properties and potential applications in various areas, such as catalysts, [25][26][27][28][29][30] sensors [31][32][33][34][35][36][37][38] and electrodes. [39][40][41][42][43][44][45][46][47] The magnetic and optical properties of vanadium oxide nanotubes (VONTs) have also been thoroughly investigated.…”

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confidence: 99%

Polycrystalline Vanadium Oxide Nanorods: Growth, Structure and Improved Electrochemical Response as a Li-Ion Battery Cathode Material

McNulty

Buckley

O’Dwyer

2014

J. Electrochem. Soc.

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Thermally removing amine molecules that serve as chemical templates for vanadium oxide nanotubes is demonstrated to significantly improve the performance when tested as a cathode material in Li-ion battery cells. Capacity fading issues associated with blocked intercalation sites on the (010) faces of layered vanadium oxide that form the nanotubes are prevented. Thermal treatment of the nanotubes up to 600 • C is shown to cause a specific conversion from nanotubes to polycrystalline nanorods and removal of the organic template. The conversion process was monitored by thermogravimetric analysis, X-ray diffraction, transmission electron microscopy and infra-red spectroscopy. In a potential window of 4.0-1.2 V drawing 30 μA (C/30), the nanorods show improved specific capacities of ∼280 mAh g −1 with a modest 6% capacity fade compared to ∼8 mAh g −1 with 62% capacity fade for the VONTs. The improvements in specific capacity and cycling performance are due to the successful removal of amine molecules and conversion to nanorods containing nanoscale crystals. The cathode material also demonstrated enhanced energy densities (∼700 W h kg −1 ) compared to composites of the same overall weight, without conductive carbon additives or polymeric binders. In recent years there has been a significant increase in the desire and need to improve the performance and cycle life of commercial rechargeable lithium ion batteries.1-6 The advent of smart phones and tablet devices has highlighted the limitations of current generation lithium ion batteries. Rechargeable lithium ion batteries still hold great promise for use in powering electric and hybrid electric vehicles and continue to be crucial in medical and handheld portable devices. 7However it is vital that factors such as power and energy density, coulometric efficiency and rate performance are improved upon in order to meet demands for improved performance in advanced Liion batteries (∼400 Wh/kg). 1,4,[7][8][9] It is no surprise that nanostructured materials are attracting significant attention because of their novel properties and their potential applications in a wide range of devices such as biological and gas sensors, 10-18 field effect transistors 19,20 and as electrode materials for next generation high energy density batteries. 21-23 Nanostructured cathode electrodes offer improved energy storage capacity and charge-discharge kinetics, as well as better cyclic stabilities.24 This is, in part, due to the increased surface area in direct contact with the electrolyte, and better electronic and ionic conductivity, and shorter distances for cation diffusion as compared with bulk materials. 25 Nanostructured electrodes are also able to better accommodate volume changes associated with cyclic intercalation and deintercalation of lithium ions into and from the host lattice. This reduces pulverization issues associated with bulk materials and consequently improves cycle life. 62 Nanostructures such as vanadium oxide nanotubes (VONTs) and nanorods are particularly attractive in prin...

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V2O5 nanowires with an intrinsic iodination activity leading to the formation of self-assembled melanin-like biopolymers

Cited by 21 publications

References 62 publications

High‐Performance TiO₂ Nanoparticle/DOPA‐Polymer Composites

High‐Performance TiO₂ Nanoparticle/DOPA‐Polymer Composites

Morphological and Chemical Composition Characterization of Commercial Sepia Melanin

Polycrystalline Vanadium Oxide Nanorods: Growth, Structure and Improved Electrochemical Response as a Li-Ion Battery Cathode Material

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V2O5 nanowires with an intrinsic iodination activity leading to the formation of self-assembled melanin-like biopolymers

Cited by 21 publications

References 62 publications

High‐Performance TiO2 Nanoparticle/DOPA‐Polymer Composites

High‐Performance TiO2 Nanoparticle/DOPA‐Polymer Composites

Morphological and Chemical Composition Characterization of Commercial Sepia Melanin

Polycrystalline Vanadium Oxide Nanorods: Growth, Structure and Improved Electrochemical Response as a Li-Ion Battery Cathode Material

Contact Info

Product

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High‐Performance TiO₂ Nanoparticle/DOPA‐Polymer Composites

High‐Performance TiO₂ Nanoparticle/DOPA‐Polymer Composites