Dr. Daniel Lee Sargeant

Metropolregion Basel Kontaktinformationen
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Experienced program leader / project manager in delivering amazing customer experiences…

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Bescheinigungen und Zertifikate

Ehrenamt

Veröffentlichungen

  • Ammonium Bis(ethylhexyl) Phosphate:  A New Surfactant for Microemulsions

    Langmuir

    The ammonium salt of the metal ion extractant bis(ethylhexyl) hydrogen phosphate (HDEHP) has been found to stabilize water-in-oil (w/o) microemulsions over a wide range of ω (=[H2O]/[NH4DEHP]) and temperature. Such extensive solubilization has not been observed for Gp I, II, or III metal salts of HDEHP. In the absence of added water, SANS measurements show the formation of rod-shaped reversed micelles which progressively decrease in length as water is added in the range ω < 5. At constant ω…

    The ammonium salt of the metal ion extractant bis(ethylhexyl) hydrogen phosphate (HDEHP) has been found to stabilize water-in-oil (w/o) microemulsions over a wide range of ω (=[H2O]/[NH4DEHP]) and temperature. Such extensive solubilization has not been observed for Gp I, II, or III metal salts of HDEHP. In the absence of added water, SANS measurements show the formation of rod-shaped reversed micelles which progressively decrease in length as water is added in the range ω < 5. At constant ω the rod length increases with surfactant concentration. For ω > 5 spherical droplet w/o microemulsions are formed with the droplet size increasing in proportion to ω. Analysis of SANS data gives the head group area of NH4DEHP in the surfactant layer of larger spherical microemulsion droplets as 63 ± 3 Å2.

    Andere Autor:innen
    • Brian Robinson
    • Gabriel Welsh
    • David Steytler

  • Lamellar Aggregates in the L2 Phase of a Nonionic Silicone Surfactant (L77-OH)

    Langmuir

    The ternary phase diagram for the silicone-based, nonionic surfactant L77-OH, water, and cyclohexane shows a narrow L2 region in the oil-rich corner. At 25-degrees-C the maximum water solubilization, as determined by the water-to-surfactant molar ratio, w(max), is 22.0. Since this is close to the estimated hydration number of the surfactant hydrophilic EO groups, reversed micellar aggregates, rather than water-in-oil microemulsion droplets, are believed to be present. Analysis of the SANS…

    The ternary phase diagram for the silicone-based, nonionic surfactant L77-OH, water, and cyclohexane shows a narrow L2 region in the oil-rich corner. At 25-degrees-C the maximum water solubilization, as determined by the water-to-surfactant molar ratio, w(max), is 22.0. Since this is close to the estimated hydration number of the surfactant hydrophilic EO groups, reversed micellar aggregates, rather than water-in-oil microemulsion droplets, are believed to be present. Analysis of the SANS profiles from the dilute (phi < 0.05) L2 phase indicates that discrete lamellar aggregates are present at all w values. The SANS data are quantitatively fitted using a disk form factor P(Q) which determines the bilayer thickness (t) and allows an estimation of the lateral dimension through the disk radius (r). At low water content (w approximately 5.0) the value of t suggests that the EO chains are in an interdigitated (or coiled) configuration. It was found that t increases with w until at w(max) the EO chain is apparently fully extended. The radius also increases with w from 77 angstrom (w = 3.4) to larger dimensions (> 100 angstrom) which cannot accurately be measured using the available Q-range. Further support for a reversed bilayer structure in the L2 phase is obtained from studies of binary L77-OH/water mixtures. Polarizing microscopy shows the phase to be lamellar (L(alpha)). A similar layer thickness in the binary and ternary phases at the same w is found by SANS.

    Andere Autor:innen
    • David Steytler
    • Brian Robinson
    • Julian Eastoe
    • Richard Heenan
    Veröffentlichung anzeigen

Projekte

  • run71.com - Online business selling running shoes

    –

    With a keen passion for running, and noticing the very high price of running shoes in Switzerland, I decided to create an online store selling running shoes to the Swiss market at very competitive prices.

    I took a multi-channel approach to my sales and promotion, and used eBay, Search Engine Optimization, Google Analytics and Google Advertising to build up business and customer base of more than 850 in Switzerland. Weekends were often spent promoting the store at races and triathlon…

    With a keen passion for running, and noticing the very high price of running shoes in Switzerland, I decided to create an online store selling running shoes to the Swiss market at very competitive prices.

    I took a multi-channel approach to my sales and promotion, and used eBay, Search Engine Optimization, Google Analytics and Google Advertising to build up business and customer base of more than 850 in Switzerland. Weekends were often spent promoting the store at races and triathlon events.

    In 2010, www.run71.com was the largest online reseller of Asics running shoes in Switerland.

    Market de-regulation and increased competition from new distributors (e.g. Zalando) led me to close the business at the end of 2012 due to lack of resources to stay ahead of the competition.

Auszeichnungen/Preise

  • Purple Star Award

    eBay

Sprachen

  • German

    Fließend

  • English

    Muttersprache oder zweisprachig

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