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Matsui H.,University of Tokyo | Furuta S.,Tomoe Work Co. | Hasebe T.,Central Customs Laboratory | Tabata H.,University of Tokyo
ACS Applied Materials and Interfaces | Year: 2016

This paper describes infrared plasmonic responses in three-dimensional (3D) assembled films of In2O3:Sn nanoparticles (NPs). The introduction of surface modifications to NPs can facilitate the production of electric-field interactions between NPs due to the creation of narrow crevices in the NP interfaces. In particular, the electric-field interactions along the in-plane and out-of-plane directions in the 3D assembled NP films allow for resonant splitting of plasmon excitations to the quadrupole and dipole modes, thereby realizing selective high reflections in the near- and mid-infrared range, respectively. The origins of these plasmonic properties were revealed from electric-field distributions calculated by electrodynamic simulations that agreed well with experimental results. The interparticle gaps and their derived plasmon couplings play an important role in producing high reflective performances in assembled NP films. These 3D assemblies of NPs can be further extended to produce large-size flexible films with high infrared reflectance, which simultaneously exhibit microwave transmittance essential for telecommunications. This study provides important insights for harnessing infrared optical responses using plasmonic technology for the fabrication of infrared thermal-shielding applications. © 2016 American Chemical Society. Source

Tudorache M.,University of Bucharest | Negoi A.,University of Bucharest | Tudora B.,Central Customs Laboratory | Parvulescu V.I.,University of Bucharest
Applied Catalysis B: Environmental | Year: 2014

In this work, the conversion of waste glycerol from biodiesel production to glycerol carbonate (GlyC) as added-value product has been investigated. The transformation of waste glycerol to GlyC has been achieved taking the advantage of dimethyl carbonate (DMC) reaction with glycerol catalyzed by heterogeneous lipase biocatalyst under solvent-free conditions. The biocatalyst design was the lipase enzyme anchored on magnetic nano-particle surface via covalent binding. Waste glycerol with different matrixes according to the feedstock patterns (e.g. soybean, sunflower, rape, corn, olive, palm, and residual oil) has been tested for GlyC bio-synthesis. Content of MeOH, H2O, metals and salts from sample matrix (e.g. waste glycerol) was characterized using gravimetric and energy dispersive X-ray fluorescence (EDXRF) spectrometry techniques. Impurities effects of the waste glycerol on the performance of the biocatalytic process and also different strategies to avoid them were investigated. © 2013 Elsevier B.V. Source

Matsui H.,University of Tokyo | Badalawa W.,University of Tokyo | Hasebe T.,Central Customs Laboratory | Furuta S.,Tomoe Works Co. | And 4 more authors.
Applied Physics Letters | Year: 2014

Near-infrared Er photoluminescence (PL) is markedly modified using a plasmonic In2O3: Sn nanoparticle (NP) sheet. Modeling and optical measurements reveal the presence of different electric fields (E-field) in the NP sheet. The local E-field excited at the interface between the NP sheet and Er-emitting layer of ZnO contributes significantly towards the spectral modifications of Er PL due to matching with the photon energy of Er PL. We also determine the critical temperature for Er PL modifications, which is related to the energy transfer efficiency between Er transition dipoles in ZnO and the plasmon modes on the NP sheet. © 2014 AIP Publishing LLC. Source

Yoshimura S.,Yokohama Customs Laboratory | Akasaki T.,Central Customs Laboratory | Ishikawa T.,Yokohama Customs Laboratory | Ofuji M.,Yokohama Customs Laboratory | And 3 more authors.
International Sugar Journal | Year: 2014

Increased environmental and health concern about lead compounds is making it difficult to purchase basic lead acetate and will not therefore allow analysts to use the current ICUMSA method GS1/2/3-1 for much longer. In order to seek an environment-friendly alternative, we compared the existing method with a possible replacement which is lead-free, including the transition to a tentative ICUMSA method GS1/2/3-2 (Near Infra-Red polarimetirc method). Sixteen non-lead chemical compounds and one lead-free deproteinizing agent (a combination of a zinc sulfate solution and a barium hydroxide solution) were tested for clarifying raw cane sugars from Australia, Thailand and Philippine for polarization analysis. Findings indicated that a combined pre-treatment with a lead-free deproteinizing agent followed by a celite filtration was effective for clarifying raw sugars. The polarization values analyzed using the lead-free pre-treatment method were nearly equal to those by the ICUMSA method GS1/2/3-1 (the difference: ±0.04 (AVE ±0.00); n=11) with no statistical significance at the 95% confidence level. The robustness (%RSD < 0.01; r ≤ 0.10) of the lead-free polarization analysis method was evaluated by a repeatability test with five duplicates of five different samples. Therefore, the pre-treatment method developed in this study is effective to replace the current ICUMSA method GS1/2/3-1 to its lead-free version with a minor modification but without diminishing the accepted robustness for an ICUMSA official method. To validate this method further, it is proposed that the method be tested on raw sugars from other parts of the world including those with a relatively high average polarization value. Source

Kadokura M.,Japan National Food Research Institute | Kadokura M.,Food and Agricultural Materials Inspection Center | Homura Y.,Food and Agricultural Materials Inspection Center | Watanabe H.,Central Customs Laboratory | And 4 more authors.
Nippon Shokuhin Kagaku Kogaku Kaishi | Year: 2010

Imported pumpkins (Cucurbita maxima), mostly from New Zealand and Mexico, account for two-fifth of the pumpkins distributed in Japan. As correct labeling of geographic origin is also required for pumpkins grown in Japan, we examined techniques to determine the geographic origin of pumpkins using 113 lots : 49 from Japan, 33 from Mexico and 31 from New Zealand. From each lot, seeds were collected from 10 pumpkins and pulverized. Approximately 1-2 g of test seed material was digested with nitric acid in a microwave digestor. Twenty-three elements (Mg, P, K, Ca, V, Mn, Co, Ni, Cu, Zn, Rb, Sr, Y, Mo, Cd, Cs, Ba, La, Ce, Nd, Sm, Gd and T1) were analyzed by ICP-AES and ICP-MS. Linear discriminant analysis (LDA) was applied to two models to discriminate the geographic origin between Japan and Mexico (J-M) and between Japan and New Zealand (J-N). Using the established J-M LDA model using 6 elements (P, Ni, Zn, Rb, Sr and Mo) on 38 samples, 89% were correctly determined. Using the established J-N LDA model with 8 elements (P, K, Ca, Ni, Zn, Rb, Sr and Ba) correctly assigned the location of 87% of 39 samples. This technique was evaluated by three laboratories. Source

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