Layered Nanostructures of Delaminated Anatase:  Nanosheets and Nanotubes

Mogilevsky, Gregory; Chen, Qiang; Kulkarni, Harsha; Kleinhammes, Alfred; Mullins, W. M.; Wu, Yue

doi:10.1021/jp076899p

Cited by 62 publications

(82 citation statements)

References 42 publications

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“…As shown in Fig. 1(a), most of the diffraction peaks of TiO 2 nanotubes can be readily indexed to anatase phase of TiO 2 , which is in accordance with the report of Gregory Mogilevsky et al [15,16]. As they reported, the samples were composed of sheets containing a few layers and shared the same intrinsic structure-stacking arrangement perpendicular to the layers and the same order within layers.…”

Section: Characterization Methodssupporting

confidence: 88%

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Synthesis and luminescent properties of TiO2:Eu3+ nanotubes

Zhang

et al. 2011

Powder Technology

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Section: Characterization Methodssupporting

confidence: 88%

“…It can be seen that the XRD pattern of Eu 3+ -doped TiO 2 nanocrystals reveals a pure typical anatase phase of TiO 2 , which is different from that of the TiO 2 :Eu 3+ nanotubes. The difference between the two XRD patterns results from the different structures [15,16]. Fig.…”

Section: Characterization Methodsmentioning

confidence: 98%

Synthesis and luminescent properties of TiO2:Eu3+ nanotubes

Zhang

et al. 2011

Powder Technology

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“…The broad peak at 2θ ) 10.2°in both cases corresponds to a distance of 0.87 nm which can be attributed to the wall separation in TiO 2 nanotubes. 15,16 This is also reflected in the TEM image (Figure 2b) which shows a wall separation of 0.86 nm. Formation of metastable TiO 2 (B) phase is well accounted for as TiO 2 (B) usually forms during the dehydration of the intermediate layered or tunnel-structured hydrogen titanate at low calcination temperature.…”

Section: Methodsmentioning

confidence: 61%

High Lithium Storage in Mixed Crystallographic Phase Nanotubes of Titania and Carbon-Titania

Das

Bhattacharyya

2009

J. Phys. Chem. C

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Morphology and electrochemical performance of mixed crystallographic phase titania nanotubes for prospective application as anode in rechargeable lithium ion batteries are discussed. Hydrothermally grown nanotubes of titania (TiO 2 ) and carbon-titania (C-TiO 2 ) comprise a mixture of both anatase and TiO 2 (B) crystallographic phases. The first cycle capacity (at current rate ) 10 mAg -1 ) for bare TiO 2 nanotubes was 355 mAhg -1 (approximately 1.06 Li), which is higher than both the theoretical capacity (335 mAhg -1 ) and the reported values for pure anatase and TiO 2 (B) nanotubes. Higher capacity is attributed to a combination of the presence of mixed crystallographic phases of titania and trivial size effects. The surface area of bare TiO 2 nanotubes was very high at 340 m 2 g -1 . C-TiO 2 nanotubes showed a slightly lower first-cycle specific capacity of 307 mAhg -1 , but the irreversible capacity loss in the first cycle decreased by half compared to bare TiO 2 nanotubes. The C-TiO 2 nanotubes also showed a better rate capability, that is, higher capacities compared to bare TiO 2 nanotubes in the current range 0.1-2 Ag -1 . Enhanced rate capability in the case of C-TiO 2 is attributed to the efficient percolation of electrons as well as to the decrease in the anatase phase.

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“…For example, the 2-h LC50 of the nematode Caenorhabditis elegans was found to be 25 mg L À1 under the exposure of ZnO-NPs (60-100 nm) and natural sunlight, whereas same concentrations of ZnO-NPs induced no adverse effects under laboratory lighting or dark conditions [40]. In contrast, no significant growth inhibition was induced in the green algae Pseudokirchneriella subcapitata when exposed to UV pre-irradiated ZnO-NPs (<100 nm) under visible, UVA and UVB irradiation conditions at a concentration range between 0.05 and 0.3 mg ZnO-NP L À1 [41]. Most documented studies on photoinduced toxicity of ZnO-NPs were conducted with bacteria and freshwater species [34,40]; the photocatalytic activity of ZnO-NPs Ecotoxicity of Zinc Oxide Nanoparticles in the Marine Environment is less known in marine species.…”

Section: The Generation Of Rosmentioning

confidence: 91%

Electrohydrodynamic Forming

2016

Encyclopedia of Nanotechnology

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SynonymsEnvironmental toxicology; Nano-ecotoxicology; Toxicity of metal and metal oxide nanoparticles on Prokaryotes (bacteria), unicellular and invertebrate Eukaryotes DefinitionA toxic product is a chemical compound that harms the environment by affecting the biological organisms. Due to their novel properties, nanoparticles (NPs) cannot be considered as other organic and inorganic xenobiotics in the environment, e.g., pesticides, HAPs and PCBs dissolved metals, or also medicines. NPs have a mass, a charge, and above all a surface area. They are subject to phenomena of classical and quantum physics. Their reactivity means that their surface atoms are labile, easily change their redox state, and highly reactive with respect to compounds in the environment. Considering the huge range of applications using NPs, it seems reasonable to expect their dissemination in the environment at each step in their life cycle, from design through production to use and disposal of finished products. To date, the data available show that NPs can cross biological membranes and distribute themselves within different compartments of living organisms, or can also induce a remote toxicity. Consequently, there is a need to elucidate how the NPs can lead to adverse effects on organisms in their natural environment, considering not only their effects on target organs and life traits, but also their fate and transfers within the food webs ( Fig. 1) (Box 1). Box 1: Ecosystem and Food ChainsAn ecosystem is the basic functional unit in ecology, as it includes both organisms and their abiotic environments (Fig. 1). It represents the highest level of ecological integration based on energy and biomass transfers. It is defined as a specific unit of all the organisms occupying a given area that interacts with the physical environment producing distinct trophic structure, biotic diversity, and material cycling. OverviewThe number of available publications (Fig. 2) dealing with the environmental impacts of NPs (called nano-ecotoxicology [1]) is presented in Fig. 2. Studies regarding algae, protozoa, and invertebrates are more recent (since 2006) than the ones regarding bacteria (which started in the 1980s) (ISI Web of Knowledge source) (Box 2). As a consequence, researches on bactericidal effects are more advanced (already at the scale of biofilms and the microbial community Ecotoxicity of Inorganic Nanoparticles: From Unicellular Organisms to Invertebrates structures), while for the other models nanoecotoxicology is still in its infancy (at the individual scale). About 30 species of invertebrates are studied regarding the three main ecosystemic domains: freshwater, marine, and terrestrial. For each domain, the Crustacean Cladocera Daphniidae (freshwater), the Mollusks Bivalvia Mytilidae, and Annelids Polychaetes (marine) are the most studied invertebrates, while the terrestrial (earthworms and isopods) examples are scarce.Considering the three-domain system that divides cellular life into archaea, bacteria, and eukaryote domains (based on diff...

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Layered Nanostructures of Delaminated Anatase: Nanosheets and Nanotubes

Cited by 62 publications

References 42 publications

Synthesis and luminescent properties of TiO2:Eu3+ nanotubes

Synthesis and luminescent properties of TiO2:Eu3+ nanotubes

High Lithium Storage in Mixed Crystallographic Phase Nanotubes of Titania and Carbon-Titania

Electrohydrodynamic Forming

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