Maike Siemons, PhD

Frankfurt/Rhein-Main Kontaktinformationen
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Berufserfahrung und Ausbildung

  • Procter & Gamble

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Veröffentlichungen

  • Gas Sensing Properties of Volume-Doped CoTiO3 Synthesized via Polyol Method

    Sensors and Actuators B

    Siemons,M. And Simon,U.

    Veröffentlichung anzeigen

  • Reactivity and properties of [-O-BiIII⋯O=Mo-]n chains

    Inorganic chemistry. 45. 9020-31

    A coordination polymer [Cp(O)2Mo-O-Bi(o-tolyl)2]n, II, containing Mo-O-Bi and Mo=O...Bi moieties was investigated with respect to its behavior in contact with OH- and Cp2MoH2 and as potential single source precursor in the polyol method. It turned out that hydroxide as a base breaks up the polymer to yield CpMoO3- and (o-tolyl)2BiOH. The latter polymerizes to give the coordination polymer [(o-tolyl)2BiOH]n, 1. Alternatively, 1 can be prepared by reacting [(o-tolyl)2Bi(hmpa)2]SO3CF3 with…

    A coordination polymer [Cp(O)2Mo-O-Bi(o-tolyl)2]n, II, containing Mo-O-Bi and Mo=O...Bi moieties was investigated with respect to its behavior in contact with OH- and Cp2MoH2 and as potential single source precursor in the polyol method. It turned out that hydroxide as a base breaks up the polymer to yield CpMoO3- and (o-tolyl)2BiOH. The latter polymerizes to give the coordination polymer [(o-tolyl)2BiOH]n, 1. Alternatively, 1 can be prepared by reacting [(o-tolyl)2Bi(hmpa)2]SO3CF3 with NBu4OH/H2O in thf/water. If, however, NBu4OH/MeOH is used in dichloromethane as the solvent, the (o-tolyl)2BiOH formed intermediately undergoes methanolysis, and finally, [(o-tolyl)2BiOMe]n, 3, is isolated. Although 1 and 3 are very similar compounds, their crystal structures differ significantly: while the structure of 1 is dominated by secondary bonding leading to seesaw-type coordination geometries around the Bi centers, the Bi atoms in 3 are coordinated in a distorted tetrahedral fashion, and secondary bonding plays only a minor role. If 1 is dissolved in a nonpolar, nonprotic solvent, condensation reactions occur immediately leading to [(o-tolyl)2BiOBi(o-tolyl)2], 2, which can be obtained on a preparative scale this way. Compound 3 which can be prepared in good yields may prove to be a useful starting material in bismuth chemistry. Here, it was shown to react with molybdocene dihydrides to provide stable Bi-substituted molybdocene monohydrides [(R)Cp2Mo(H)(Bi(o-tolyl)2)] (R = Me 4, R = H 5); compounds of that type were identified in solution before but had so far eluded isolation. Compound 4, whose crystal structure is discussed, also forms when II is treated with methylated molybdocene dihydride. This obviously leads to the formation of Mo-Bi bonds (--> 4), as well as Mo-OH units, which undergo condensation reactions leading to Mo-O-Mo moieties (i.e., [Cp2Mo2O5] is formed as a byproduct)....

  • Advances in high throughput screening of gas sensing materials. Applied Surface Science

    APPL SURF SCI. 254. 669-676

    The workflow of a high throughput screening setup for the rapid identification of new and improved gas sensor materials is presented. The polyol method was applied to prepare nanoparticulate metal oxides as base materials. These materials have been modified by surface and volume doping. Using multielectrode substrates and high throughput impedance spectroscopy (HT-IS) a wide range of materials could be screened on a short time scale. Selected examples reflect the state of the art for applying…

    The workflow of a high throughput screening setup for the rapid identification of new and improved gas sensor materials is presented. The polyol method was applied to prepare nanoparticulate metal oxides as base materials. These materials have been modified by surface and volume doping. Using multielectrode substrates and high throughput impedance spectroscopy (HT-IS) a wide range of materials could be screened on a short time scale. Selected examples reflect the state of the art for applying HT-IS in search of new selective gas sensing materials.

Patente

  • Articles having an aquisition layer with stretch openings and process to make them

    Angemeldet am US 20190328588

    Andere Erfinder:innen
    • Dirk Saevecke
    • Julien Rene Garcia

  • Absorbent articles with multi-pieces acquisition layer

    US 20190328587, EP-B-3560466

    An absorbent article (20) for personal hygiene having a wearer-facing side, a garment-facing side, and a longitudinal axis (80), wherein the absorbent article has a length (L) measured along the longitudinal axis, the article comprising:
    - a liquid permeable topsheet (24) on the wearerfacing side;
    - a liquid impermeable backsheet (25) on the garment-facing side;
    - an absorbent core (28) between the topsheet and the backsheet; and
    - an acquisition layer (52) between the topsheet…

    An absorbent article (20) for personal hygiene having a wearer-facing side, a garment-facing side, and a longitudinal axis (80), wherein the absorbent article has a length (L) measured along the longitudinal axis, the article comprising:
    - a liquid permeable topsheet (24) on the wearerfacing side;
    - a liquid impermeable backsheet (25) on the garment-facing side;
    - an absorbent core (28) between the topsheet and the backsheet; and
    - an acquisition layer (52) between the topsheet and the absorbent core,
    characterized in that the acquisition layer comprises two, three or more discrete pieces (521, 522, 523) of an acquisition material,
    wherein the pieces of acquisition material are longitudinally-orientated stripes,
    wherein at least some or all the stripes have a length as measured in the longitudinal direction which is at least 25% of the length (L) of the article.

    Andere Erfinder:innen
    • Dirk Saevecke
    • Julien Rene Garcia

  • Grafted crosslinked cellulose

    Angemeldet am US 20170066865

    Andere Erfinder:innen
    • Karen Brogan
    • Charles E. Miller
    • Angel Stoyanov
    • Torsten Lindner

  • Grafted crosslinked cellulose

    Angemeldet am US 20170022314

    Andere Erfinder:innen
    • Karen Brogan
    • Charles E. Miller
    • Angel Stoyanov
    • Torsten Lindner

  • Grafted crosslinked cellulose used in absorbent articles

    Angemeldet am US 20170022671

    Andere Erfinder:innen
    • Karen Brogan
    • Charles E. Miller
    • Angel Stoyanov
    • Torsten Lindner

  • Grafted Crosslinked Cellulose

    US 20200087435

    Andere Erfinder:innen
    • Karen Brogan
    • Charles E. Miller
    • Angel Stoyanov
    • Torsten Lindner

  • Grafted Crosslinked cellulose

    US 20210246247

    Andere Erfinder:innen
    • Karen Brogan
    • Charles E. Miller
    • Angel Stoyanov
    • Torsten Lindner

  • Grafted crosslinked Cellulose

    US 10287383

    Andere Erfinder:innen
    • Karen Brogan
    • Charles E. Miller
    • Angel Stoyanov
    • Torsten Lindner

  • Grafted crosslinked cellulose used in absorbent articles

    US 10337150

    Andere Erfinder:innen
    • Karen Brogan
    • Charles E. Miller
    • Angel Stoyanov
    • Torsten Lindner

Auszeichnungen/Preise

  • Borchers-Plakette

    Rektor der RWTH

Sprachen

  • Englisch

    Verhandlungssicher

  • Deutsch

    Muttersprache oder zweisprachig

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