@article {2405, title = {Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles}, journal = {Geophysical Research Letters}, volume = {36}, year = {2009}, note = {ISI Document Delivery No.: 401YZTimes Cited: 17Cited Reference Count: 28Eastwood, Michael L. Cremel, Sebastien Wheeler, Michael Murray, Benjamin J. Girard, Eric Bertram, Allan K.}, month = {Jan}, pages = {5}, type = {Article}, abstract = {The onset conditions for ice nucleation on H2SO4 coated, (NH4)(2)SO4 coated, and uncoated kaolinite particles at temperatures ranging from 233 to 246 K were studied. We define the onset conditions as the relative humidity and temperature at which the first ice nucleation event was observed. Uncoated particles were excellent ice nuclei; the onset relative humidity with respect to ice (RHi) was below 110\% at all temperatures studied, consistent with previous measurements. H2SO4 coatings, however, drastically altered the ice nucleating ability of kaolinite particles, increasing the RHi required for ice nucleation by approximately 30\%, similar to the recent measurements by Mohler et al. [2008b]. (NH4)(2)SO4 coated particles were poor ice nuclei at 245 K, but effective ice nuclei at 236 K. The differences between H2SO4 and (NH4)(2)SO4 coatings may be explained by the deliquescence and efflorescence properties of (NH4)(2)SO4. These results support the idea that emissions of SO2 and NH3 may influence the ice nucleating properties of mineral dust particles. Citation: Eastwood, M. L., S. Cremel, M. Wheeler, B. J. Murray, E. Girard, and A. K. Bertram (2009), Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles, Geophys. Res. Lett., 36, L02811, doi: 10.1029/2008GL035997.}, keywords = {AEROSOLS, AQUEOUS-SOLUTIONS, crystallization, GOETHITE, MINERAL DUST, NUCLEI, TEMPERATURES}, isbn = {0094-8276}, url = {://000262981800002}, author = {Eastwood, M. L. and Cremel, S. and Wheeler, M. and Murray, B. J. and Girard, E. and Bertram, A. K.} } @article {2539, title = {Very slow expansion of an ultracold plasma formed in a seeded supersonic molecular beam of NO}, journal = {Physical Review A}, volume = {79}, number = {6}, year = {2009}, note = {ISI Document Delivery No.: 466XZTimes Cited: 2Cited Reference Count: 35Morrison, J. P. Rennick, C. J. Grant, E. R.}, month = {Jun}, pages = {7}, type = {Article}, abstract = {The double-resonant laser excitation of nitric oxide, cooled to 1 K in a seeded supersonic molecular beam, yields a gas of approximate to 10(12) molecules per cubic centimeter in a single selected Rydberg state. This population evolves to produce prompt free electrons, and a durable cold plasma of electrons and intact NO+ ions. This plasma travels with the molecular beam through a field-free region to encounter a grid. The atomic weight of the expansion gas controls the beam velocity and hence the flight time from the interaction region to the grid. Monitoring electron production as the plasma traverses this grid measures its longitudinal width as a function of flight time. Comparing these widths to the width of the laser beam that defines the initial size of the illuminated volume allows us to gauge the rate of expansion of the plasma. We find that the plasma created from the evolution of a Rydberg gas of NO expands at a small but measurable rate, and that this rate of expansion accords with the Vlasov equations for an initial electron temperature of T-e approximate to 7 K.}, keywords = {3-BODY RECOMBINATION, COMPOUNDS, ELECTRONS, GASES, laser cooling, molecular beams, molecule-photon collisions, NEUTRAL PLASMAS, NITROGEN, Photoexcitation, PLASMA, plasma collision processes, positive ions, RATES, RYDBERG ATOMS, Rydberg states, STATES, TEMPERATURE, TEMPERATURES, VACUUM, Vlasov equation}, isbn = {1050-2947}, url = {://000267700100086}, author = {Morrison, J. P. and Rennick, C. J. and Grant, E. R.} } @article {332, title = {A differential vapor-pressure equipment for investigations of biopolymer interactions}, journal = {Journal of Biochemical and Biophysical Methods}, volume = {50}, number = {2-3}, year = {2002}, note = {ISI Document Delivery No.: 510CETimes Cited: 7Cited Reference Count: 47}, month = {Jan}, pages = {269-288}, type = {Article}, abstract = {The design and performance of an equipment for the measurement of vapor pressures over liquid or solid samples is presented. The equilibrium pressure difference, DeltaP, between a sample and a reference of known vapor pressure is recorded as a function of composition and/or temperature. Through the use of high-accuracy capacitance manometers and a leak-tight system of stainless steel pipes, below-scaled valves and metal-gasket fittings, DeltaP can be measured with a resolution of about 0.5 mubar (0.05 Pa) in some applications. This sensitivity level, along with other features of the equipment, particularly a "gas-phase titration" routine for changing the cell composition, makes it effective for the investigations of several types of biopolymer interactions. These include isothermal studies of net affinities such as the adsorption of water to proteins or membranes, the preferential interaction of biopolymers with the components of a mixed solvent. the partitioning of solutes between a membrane and the aqueous bulk and the weak. specific binding of ligands to macromolecules. Furthermore, a temperature-scanning mode allows real-time elucidation of such interactions at thermally induced conformational changes in biopolymers. Selected examples of these applications are presented and discussed. (C) 2002 Elsevier Science B.V. All rights reserved.}, keywords = {25-DEGREES-C, ALCOHOLS, BINDING, BOVINE SERUM-ALBUMIN, CALORIMETER, differential, hydration, LIQUID-EQUILIBRIA, preferential interaction, static vapor pressure, temperature scanning, TEMPERATURES, THERMODYNAMICS, titration, WATER, weak binding}, isbn = {0165-022X}, url = {://000173190500016}, author = {Andersen, K. B. and Koga,Yoshikata and Westh, P.} } @article {3723, title = {Normalized fluctuations, H2O vs n-hexane: Site-correlated percolation}, journal = {Journal of Chemical Physics}, volume = {105}, number = {5}, year = {1996}, note = {ISI Document Delivery No.: UZ525Times Cited: 20Cited Reference Count: 49}, month = {Aug}, pages = {2028-2033}, type = {Article}, abstract = {Entropy, volume and the cross fluctuations were normalized to the average volume of a coarse grain with a fixed number of molecules, within which the local and instantaneous value of interest is evaluated. Comparisons were made between liquid H2O and n-hexane in the range from -10 degrees C to 120 degrees C and from 0.1 MPa to 500 MPa. The difference between H2O and n-hexane in temperature and pressure dependencies of these normalized fluctuations was explained in terms of the site-correlated percolation theory for H2O. In particular, the temperature increase was confirmed to reduce the hydrogen bond probability, while the pressure appeared to have little effect on the hydrogen bond probability. According to the Le Chatelier principle, however, the putative formation of {\textquoteright}{\textquoteright}ice-like{\textquoteright}{\textquoteright} patches at low temperatures due to the site-correlated percolation requirement is retarded by pressure increases. Thus, only in the limited region of low pressure (<300 MPa) and temperature (<60 degrees C), the fluctuating ice-like patches are considered to persist. (C) 1996 American Institute of Physics.}, keywords = {2 KINDS, AQUEOUS 2-BUTOXYETHANOL, density, H-BONDS, HEAVY-WATER, LIQUID WATER, mixing, MOLECULAR-DYNAMICS, pressure, SCHEME, TEMPERATURES}, isbn = {0021-9606}, url = {://A1996UZ52500029}, author = {Koga,Yoshikata and Westh, P. and Sawamura, S. and Taniguchi, Y.} } @article {3078, title = {MIXING SCHEMES AND LIQUID-SOLID PHASE-DIAGRAM IN THE WATER-RICH REGION OF AQUEOUS 2-BUTOXYETHANOL}, journal = {Bulletin of the Chemical Society of Japan}, volume = {67}, number = {9}, year = {1994}, note = {ISI Document Delivery No.: PM797Times Cited: 11Cited Reference Count: 28}, month = {Sep}, pages = {2393-2397}, type = {Article}, abstract = {Liquid-solid phase diagram was determined in the water-rich region of aqueous 2-butoxyethanol. A solid addition compound was suggested with the composition x(BE)add = 0.0260, which melts incongruently at 269.5 K. The mixing scheme boundary separating two regions in the single liquid phase domain (Chem. Phys. Lett., 217, 245 (1994) was found to cross the incongruent melting point of the above solid addition compound.}, keywords = {BEHAVIOR, COEFFICIENTS, LIGHT-SCATTERING, MIXTURES, PARTIAL MOLAR ENTHALPIES, TEMPERATURES, TRANSITION, VOLUMES}, isbn = {0009-2673}, url = {://A1994PM79700008}, author = {Koga,Yoshikata and Tanaka, T. and Atake, T. and Westh, P. and Hvidt, A.} }