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Alumina nanoparticles

Fig. 4.56. Schematic diagram of a SERS-active substrate and the measurement arrangement. Alumina nanoparticles are deposited on a glass surface and produce the required roughness. A thin silver layer is evaporated on to the nanoparticles and serves for the enhancement. Organic molecules adsorbed on the silver surface can be detected by irradiation with a laser and collecting the Raman scattered light. Fig. 4.56. Schematic diagram of a SERS-active substrate and the measurement arrangement. Alumina nanoparticles are deposited on a glass surface and produce the required roughness. A thin silver layer is evaporated on to the nanoparticles and serves for the enhancement. Organic molecules adsorbed on the silver surface can be detected by irradiation with a laser and collecting the Raman scattered light.
Fig. 14.3 Zeta-potential of halloysite, and silica and alumina nanoparticles (for comparison). Fig. 14.3 Zeta-potential of halloysite, and silica and alumina nanoparticles (for comparison).
Yamamoto TA, Seino S, Katsura M, Okitsu K, Oshima R, Nagata Y (1999) Hydrogen gas evolution from alumina nanoparticles dispersed in water irradiated with gamma ray. Nanostructured Mater 12 1045... [Pg.113]

Reaction of the sandwich-type POM [(Fc(0H2)2)j(A-a-PW9034)2 9 with a colloidal suspension of silica/alumina nanopartides ((Si/A102)Cl) resulted in the production of a novel supported POM catalyst [146-148]. In this case, about 58 POM molecules per cationic silica/alumina nanoparticle were electrostatically stabilized on the surface. The aerobic oxidation of 2-chloroethyl ethyl sulfide (mustard simulant) to the corresponding harmless sulfoxide proceeded efficiently in the presence of the heterogeneous catalyst and the catalytic activity of the heterogeneous catalyst was much higher than that of the parent POM. In addition, this catalytic activity was much enhanced when binary cupric triflate and nitrate [Cu(OTf)2/Cu(N03)2 = 1.5] were also present [148],... [Pg.206]

Ferrocene was one of the earliest mediators used [10] but is somewhat hydrophobic so derivatives of the molecule are often employed [39-43]. Ferricyanide can also be used, and the use of MWCNT with this mediator was shown to enhance its effectiveness [33]. Other groups have studied a wide diversity of novel mediator systems such as poly(vinylferrocene-co-acrylamide) dispersed within an alumina nanoparticle membrane [34], ruthenium [35] and osmium [36,37] complexes, and the phenazine pigment pyocyanin, which is produced by the bacteria Pseudomonas aeruginosa [38]. [Pg.503]

Transfer 1.0 g of fumed alumina nanoparticles to a 100-mL round-bottom flask. [Pg.456]

Eremenko, B.V. et al.. Stability of suspensions of alumina nanoparticles in aqueous solutions of electrolytes. Colloid J., 58, 436, 1996. [Pg.937]

ZACHEIS, G. A., GRAY, K. A., KAMAT, P. V., Radiation-Induced Catalysis on Oxide Surfaces Degradation of Hexachlorobenzene on y-Irradiated Alumina Nanoparticles , J. Phys. Chem. B 1999,103, 2142-2150. [Pg.13]

X. Zhang, M. Honkanen, E. Levanen and T. Mantyla, Transition Alumina Nanoparticles and Nanorods from Boehmite Nanoflakes, J. Cryst. Growth 310, 3674-79 (2008). [Pg.77]

On 5 November 2008, the EPA announced that it was promulgating SNUR under the TSCA for two nanomaterials, siloxane-modified silica nanoparticles and siloxane-modified alumina nanoparticles, that were subject to PMN [15]. It is likely that PMN were required for these substances because they were new substances in the traditional sense and not because they were nano-sized versions of existing chemicals. [Pg.110]

Information provided in the PMN indicated that the siloxane-modified silica nanoparticles and siloxane-modified alumina nanoparticles would be used as additives. Based on test data and the substances physical properties, the EPA determined that there are concerns for lung effects from inhalation and systemic effects from dermal exposure. The PMN indicate worker inhalation exposure to the alumina nanoparticles was expected to be minimal inhalation exposure to the silica nanoparticles was not expected, and dermal exposure to both materials was also not expected. The EPA stated ... [Pg.111]

Fed. Reg. 29982, 29991 (June 24, 2009) (covering the multiwalled carbon nanotube that was the subject of PMN number P-08-177 and the single walled nanotube that was the subject of PMN P-08-328) and 73 Fed. Reg. 65743, 65751-2 (Nov. 5, 2008) (covering a siloxane modified silica nanoparticle and a siloxane modified alumina nanoparticle). [Pg.23]

One of the two nanoparticles that was the subject of the November 2008 SNUR is a siloxane modified silica nanoparticle, and the other is a siloxane modified alumina nanoparticle. EPA explained in the SNUR that it was concerned about dermal and inhalation exposures for new uses that were not described in the PMNs filed for those substances. It suggested that a ninety-day inhalation toxicity test would help characterize the human health effects for each substance. The SNURs for these two substances say that it would be a significant new use to use either substance without specified personal protective equipment, for any use other than the uses specified in the PMNs for those substances, and to manufacture, process or use them in powder form. The preamble to the SNUR says that the PMNs do not claim confidentiality for use of these substances as additives, but the PMN for one of these substance clearly limits the kind of additive for which it was intended, but everything except the word additive is claimed as confidential. Therefore, any other entity that intends to manufacture, import, or process any nanoparticles described by the generic names for these substances should submit a bona fide letter to determine their exact chemical compositions and the specifics of what uses are significant new uses. [Pg.439]

Z. Guo, T. Pereira, O. Choi, Y. Wang, and H.T. Hahn, Surface functionalized alumina nanoparticle filled polymer nanocomposites with enhanced mechanical properties, J. Mater. Chem., 16, 2800-2808 (2006). [Pg.525]

D.E. Tollman, K.L. Levine, C. Siripirom, V.G. Gelling, G.P. Bierwagen, and S.G. Croll, Nanocomposite of pol3 pyrrole and alumina nanoparticles as a coating filler for the corrosion protection of aluminium alloy 2024-T3 Appl Surf. Set, 254, 5452-5459 (2008). [Pg.679]

FIGURE 3 Size distribution of dispersions of the pure oxides Zr02 and AI2O3 in water. Note the improvement of the size distribution of Zr02 coated with a thin layer of AI2O3. The alumina nanoparticles can be dispersed to the size of the dry as prepared powder. SOURCE Mbller, 2000. [Pg.87]

Du X, Zhao S, Liu Y, Li J, Chen W, Cui Y (2014) Facile synthesis of monodisperse alpha-alumina nanoparticles via an isolation-medium-assisted calcination method. Appl Phys A-Mater Sci Process 116 1963-1969... [Pg.181]

Kathirvel P, Chandrasekaran J, Manoharan D, Kumar S (2014) Preparation and characterization of alpha alumina nanoparticles by in-flight oxidation of flame synthesis. J Alloy Compd 590 341-345... [Pg.190]

Figure 5. Stabilization of alumina nanoparticles with PEG chains via gaUol linkers (a), with block copolymer chains (b), or electrostatic stabilization (c) left schematic, right obtained particle size distributions at various salt concentrations. Reprinted fiom Ref [58] copyright 2007 American Chemical Society. Figure 5. Stabilization of alumina nanoparticles with PEG chains via gaUol linkers (a), with block copolymer chains (b), or electrostatic stabilization (c) left schematic, right obtained particle size distributions at various salt concentrations. Reprinted fiom Ref [58] copyright 2007 American Chemical Society.
Figure 6. Interparticle total energy potential for alumina nanoparticles stabilized with various fatty acids in decaline (a... particle radius). Reprinted from ref [53] with kind permission of Elsevier. Figure 6. Interparticle total energy potential for alumina nanoparticles stabilized with various fatty acids in decaline (a... particle radius). Reprinted from ref [53] with kind permission of Elsevier.
PPy AI.O3 A1 alloy 2024T3 Painting EiS in DHS The coating impedance increases when the Alumina nanoparticles content increases. [51]... [Pg.560]

Oesterling E, Chopra N, Gavalas V, Arzuaga X, Lim EJ, Sultana R, et al. Alumina nanoparticles induce expression of endothelial cell adhesion molecules. Toxicol Lett 2008 178 160-6. [Pg.194]

There is an improvement in strength by 15% and modulus by 40% for the alumina nanoparticle concentration of 10 vol% by retaining its strain at failure compared to the neat epoxy [79]. The addition of nanofillers may not increase the brittleness of the epoxy since the nanoparticles being fine in size (50-500 nm), which may not act as stress raiser. Instead they induce some mechanism that allows the deformation process rather than constraining the matrix. [Pg.317]


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See also in sourсe #XX -- [ Pg.216 ]

See also in sourсe #XX -- [ Pg.20 ]




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Nanoparticles, alumina, nucleation

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