We have developed a new photocatalyst thin film that has strong antibacterial action in visible light. In this study the radiofrequency (RF) sputter technique was used to deposit a defective titanium dioxide (TiO(x), x < 2) photocatalyst thin film (120 nm thickness) on glass and steel substrates. In the ultraviolet (UV)-visible spectrum analysis, the defective TiO(x) thin film was found to generate the red shift effect. To determine whether the defective TiO(x) thin film has antibacterial ability under visible light, we designed a series of experiments according to the Japanese Industrial Standards (JIS) Committee standard for testing antibacterial performance and for exploring the impact of surface roughness of substrate. Our results show that the antibacterial performance rate against Escherichia coli could reach 99.99% in visible light. We also proved that the coating technology can be applied effectively to surfaces with different degrees of roughness. It is suitable for protecting both human health and the natural environment.

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Stationare Phasen. Teil 39: Spurenanalyse von RDX in HMX mit einer neuen stationaren Phase von Copoly(vinylthiazo1-vinylimidazol) mittels HPLC Es wird eine Hochdruckfliissigkeitsanalysenmethode (HPLC) f i r RDX und HMX mit einer neuen stationken Phase, dem Copoly(vinylthiazol-vinylimidazol) beschrieben. Die Elutionszeiten ftir RDX und HMX mit dieser stationaren Phase bei Verwendung von Methanol/ Wasser (im Verhaltnis 60/40 bis 90/10) als mobile Phase ergeben sich zu HMX RDX, was sehr verschieden ist von einer handelsublichen RP-I 8 Phase. Die chromatographische Selektivitat (a-Werte) zwischen RDX und HMX liegt bei 2,40 bis 2,55. Dieser Vorteil kann z.B. wahrend der Herstellung von HMX ausgenutzt werden zum Nachweis geringer Verunreinigungen bis zu I ppm RDX in HMX. Phases stationnaires. 39kme partie: analyse de traees de RDX dans du HMX avec une nouvelle phase stationnaire de Copoly(viny1thiazole-vinylimidazole) au moyen de la HPLC On dicrit une methode d'analyse en phase liquide a haute pression (HPLC) pour le RDX et le HMX avec une nouvelle phase stationnaire, le copoly(vinylthiazo1e-vinylimidazole). Les temps d'elution pour le RDX et le HMX avec cette phase stationnaire en utilisant du methanol/ eau (proportion 60/40 a 90/10) en tant que phase mobile donnent HMX > RDX, ce qui est tris different d'une phase RP-I 8 de type commercial. La selectivite chromatographique (valeurs a) entre RDX et HMX est de I'ordre de 2,40 a 2,55. Cet avantage peut Stre utilisk, lors de la synthise de HMX p. ex., pour detecter la presence de petites impuretes d'env. 1 ppm de RDX dans le HMX. SummaryA method for the HPLC analysis of RDX and HMX on a novel copoly(vinylthiazo1e-vinylimidazole) stationary phase [P(Th-Im) phase] is described. Special elution order of RDX and HMX on this phase using methanol/water (60/40 -90/10) as mobile phase is HMX > RDX, which is quite different from those on a commercial RP-18 phase. The chromatographic selectivities (a-values) between RDX and HMX are 2.40-2.55. This advantage can be used to identify the limited impurity of ca. lppm RDX in HMX during the manufacture of HMX.

A method for preparing a new polar substituted triazine stationary phase is described. The structure of the triazine phase on silica was characterized by elemental analysis, and by FfIR, solid state Ff_l3C NMR, and 29Si NMR spectral analysis. The chromatographic properties of this packing material have been evaluated by using a number of different solutes, and the properties compared with those of a commercial stationary phase RP-.l8.II is found that this triazine phase has weak z-doaor ligands on the silica surface.

Better peak shapes and complete separation of amino-3,5-dinitro derivatives by (5)-yV-(2-naphthyl)alanine derived chiral stationary phase (CSP) is achieved by adding a trace amount of acetic acid in the mobile phase. This method provides an indication of its broad applicability on direct separation of a series of aminocontaining enantiomers on CSP. In addition, the reversed elution order was obtained on its enatiomeric CSP.