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2.165 Aktuelle Fachpublikationen zum Thema temperature

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Reversible Sol-Gel Transitions of Aqueous Dispersions of Silica Nanoparticles Grafted with Diblock Copolymer Brushes Composed of a Thermosensitive Inner Block and a Charged Outer Block

29.07.2015 | Bin Zhao; Roger A. E. Wright; Bin Hu; Daniel M Henn, Soft Matter, 2015

We report in this article that aqueous dispersions of thermosensitive diblock copolymer brush-grafted 17 nm silica nanoparticles (hairy NPs) can undergo in situ, reversible sol-gel transitions in response to temperature changes. The brushes consisted of a thermosensitive poly(methoxydi(ethylene ...

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Catalytic etching of monolayer graphene at low temperature via carbon oxidation

28.07.2015 | Jun Eun Jin; Jae-Hyun Lee; Jun Hee Choi; Ho-Kyun Jang; Junhong Na; Dongmok Whang; Do-Hyun Kim; Gyu Tae Kim, Physical Chemistry Chemical Physics, 2015

In this work, an easy method to etch monolayer graphene is shown by using catalytic oxidation in the presence of ZnO nanoparticles (NPs). The catalytic etching of monolayer graphene, which was transferred to the channel of field-effect transistors (FETs), was performed at low temperature by ...

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Semiconducting Polymer Nanoparticles with Persistent Near‐infrared Luminescence for In Vivo Optical Imaging

23.07.2015 | Mikael Palner, Kanyi Pu, Shirley Shao, Jianghong Rao, Angewandte Chemie International Edition, 2015

Abstract Materials with persistent luminescence are attractive for in vivo optical imaging since they have a long lifetime that allows the separation of excitation of fluorophores and image acquisition for time‐delay imaging, thus eliminating tissue autofluorescence associated with ...

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Properties of near‐surface layer of 64Zn+ ion hot‐implanted Si

22.07.2015 | Vladimir Privezentsev, Vaclav Kulikauskas, Eduard Steinman, Alexey Tereshchenko, Anatoly Bazhenov, Nataliya Tabachko ..., physica status solidi (c), 2015

Abstract We have investigated nanoparticles (NPs) formation in Si by 64Zn+ ion implantation at substrate temperature of 350 °C. Hot implantation was chosen to avoid amorphization of Si near‐surface layer. In as‐implanted samples the Zn crystal NPs were created. Then the samples were ...

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Materials, Vol. 8, Pages 4593-4607: Engineering of Iron-Based Magnetic Activated Carbon Fabrics for Environmental Remediation

22.07.2015 | Haham, Hai ; Grinblat, Judith ; Sougrati, Moulay-Tahar ; Stievano, Lorenzo ; Margel, Shlomo, Materials, 2015

Magnetic Fe3O4, Fe and Fe/Pd nanoparticles embedded within the pores of activated carbon fabrics (ACF) were prepared by impregnation of the ACF in iron acetylacetanoate (Fe(acac)3) ethanol solution, followed by thermal decomposition of the embedded iron precursor at 200, 400 and 600 °C in an ...

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A New Insight into Growth Mechanism and Kinetics of Mesoporous Silica Nanoparticles by in Situ Small Angle X-ray Scattering

22.07.2015 | Zhifeng Yi; Ludovic F. Dumée; Christopher J. Garvey; Chunfang Feng; Fenghua She; James E. Rookes; Stephen Mudie; Dav ..., Langmuir, 2015

The growth mechanism and kinetics of mesoporous silica nanoparticles (MSNs) were investigated for the first time by using a synchrotron time-resolved small-angle X-ray scattering (SAXS) analysis. The synchrotron SAXS offers unsurpassed time resolution and the ability to detect structural changes ...

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Hydrogen Spillover between Single Gold Nanorods and Metal Oxide Supports: A Surface Plasmon Spectroscopy Study

20.07.2015 | Sean S. E. Collins; Michela Cittadini; Carlos Pecharromán; Alessandro Martucci; Paul Mulvaney, ACS Nano, 2015

We used dark field spectroscopy to monitor the dissociation of hydrogen on single gold nanoparticles embedded in metal oxide supports. Individual gold nanorods were monitored in real time to reveal the peak position, the full width at half-maximum, and the relative intensity of the surface ...

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Cu Vacancies Boost Cation Exchange Reactions in Copper Selenide Nanocrystals

20.07.2015 | Vladimir Lesnyak; Rosaria Brescia; Gabriele C. Messina; Liberato Manna, Journal of the American Chemical Society, 2015

We have investigated cation exchange reactions in copper selenide nanocrystals using two different divalent ions as guest cations (Zn2+ and Cd2+) and comparing the reactivity of close to stoichiometric (that is, Cu2Se) nanocrystals with that of nonstoichiometric (Cu2–xSe) nanocrystals, to gain ...

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Materials, Vol. 8, Pages 4332-4343: Nano Sensing and Energy Conversion Using Surface Plasmon Resonance (SPR)

16.07.2015 | Kim, Iltai (Isaac); Kihm, Kenneth David, Materials, 2015

Nanophotonic technique has been attracting much attention in applications of nano-bio-chemical sensing and energy conversion of solar energy harvesting and enhanced energy transfer. One approach for nano-bio-chemical sensing is surface plasmon resonance (SPR) imaging, which can detect the ...

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Kinetics and thermodynamics of diquat removal from water using magnetic graphene oxide nanocomposite

15.07.2015 | Yongmei Hao, Zhongkai Wang, Jiajia Gou, Zhongming Wang, The Canadian Journal of Chemical Engineering, 2015

Abstract The graphene oxide nanocomposite (GO‐Fe3O4) was synthesized by a simple and low‐cost method. This nanocomposite was characterized by XRD, TEM, FT‐IR, TGA, and VSM. Spherical Fe3O4 nanoparticles with an average size of 10 nm were uniformly applied to the surface of graphene oxide ...

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