Gerald J. Diebold

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Name: Diebold, Gerald

Organization: Department of Nuclear Medicine and Radiobiology University of Sherbrooke Sherbrooke , USA

Department: Department of Nuclear Medicine and Radiobiology University of Sherbrooke Sherbrooke

Title: Professor(PhD)

Chemicals
References

Comparison of Ultrasonic Distillation to Sparging of Liquid Mixtures

Co-reporter:Hye Yun Jung, Han Jung Park, Joseph M. Calo, and Gerald J. Diebold

Analytical Chemistry 2010 Volume 82(Issue 24) pp:10090

Publication Date(Web):November 12, 2010

DOI:10.1021/ac102057g

The application of intense ultrasound to a liquid−gas interface results in the formation of an ultrasonic fountain and generates both mist and vapor from the liquid. Here, the composition of the vapor and aerosol above an ultrasonic fountain is determined as a function of irradiation time and compared with the results of sparging for five different solutions. The experimental apparatus for determining the efficiency of separation consists of a glass vessel containing a piezoelectric transducer driven at either 1.65 or 2.40 MHz. Dry nitrogen is passed over the ultrasonic fountain to remove the vapor and aerosol. The composition of the liquid solutions are recorded as a function of irradiation time using gas chromatography, refractive index measurement, nuclear magnetic resonance, or spectrophotometry. Data are presented for ethanol−water and ethyl acetate−ethanol solutions, cobalt chloride in water, colloidal silica, and colloidal gold. The experiments show that ultrasonic distillation produces separations that are somewhat less complete than what is obtained using sparging.

Introduction of Bulky Perfluoroalkyl Groups at the Periphery of Zinc Perfluorophthalocyanine: Chemical, Structural, Electronic, and Preliminary Photophysical and Biological Effects

Co-reporter:Barbara A. Bench;Andrew Beveridge;Wesley M. Sharman Dr.;Johan E. van Lier Dr.;Sergiu M. Gorun Dr.

Angewandte Chemie International Edition 2002 Volume 41(Issue 5) pp:

Publication Date(Web):7 MAR 2002

DOI:10.1002/1521-3773(20020301)41:5<747::AID-ANIE747>3.0.CO;2-J

A higher anticancer activity is observed in photodynamic tests with the first sterically bulky (nonplanar) perhalogenated zinc phthalocyanine (Pc), [F₆₄PcZn(acetone)₂] (see structure: F green, N blue, O red, C gray) in comparison with planar zinc perfluorophthalocyanine. The perfluoroisopropyl substituents enhance the solubility, stabilize axial ligands (such as the coordinated acetone molecules in the structure shown), narrow the HOMO–LUMO gap, shift redox potentials, and increase the lifetime of the excited triplet state of the new complex.

Introduction of Bulky Perfluoroalkyl Groups at the Periphery of Zinc Perfluorophthalocyanine: Chemical, Structural, Electronic, and Preliminary Photophysical and Biological Effects

Co-reporter:Barbara A. Bench;Andrew Beveridge;Wesley M. Sharman Dr.;Johan E. van Lier Dr.;Sergiu M. Gorun Dr.

Angewandte Chemie 2002 Volume 114(Issue 5) pp:

Publication Date(Web):7 MAR 2002

DOI:10.1002/1521-3757(20020301)114:5<773::AID-ANGE773>3.0.CO;2-3

Hohe Antitumor-Aktivität zeigt das erste sterisch gehinderte (nichtplanare), perhalogenierte Zink-Phthalocyanin (Pc), [F₆₄PcZn(Aceton)₂], im Vergleich zu planarem Zinkperfluorphthalocyanin (siehe Struktur: F grün, N blau, O rot, C grau). Die Perfluorisopropyl-Substituenten erhöhen die Löslichkeit, stabilisieren die axialen Liganden (wie die koordinierten Acetonmoleküle in der abgebildeten Struktur), verkleinern die HOMO-LUMO-Lücke, verändern die Redoxpotentiale und verlängern die Lebenszeit des angeregten Triplettzustandes des neuen Komplexes.

Laser-Induced “Regeneration” of Colloidal Particles: The Effects of Thermal Inertia on the Chemical Reactivity of Laser-Heated Particles

Co-reporter:Thomas E. McGrath;Andrew C. Beveridge

Angewandte Chemie International Edition 1999 Volume 38(Issue 22) pp:

Publication Date(Web):9 NOV 1999

DOI:10.1002/(SICI)1521-3773(19991115)38:22<3353::AID-ANIE3353>3.0.CO;2-J

A size reduction of the suspended particles is observed upon irradiation of colloidal metal solutions by a high-power, pulsed laser, resulting in dramatic changes in their optical properties. The mechanism of change involves rapid production of ions as a consequence of laser heating, followed by diffusion and chemical reduction on a long time scale to form new colloidal particles. The process, by which large particles are differentially consumed relative to small ones, depends on the “thermal inertia” of the particles, which governs the temperature of the particles and hence their reactivity.