@article {2198, title = {Inhibition of solute crystallisation in aqueous H+-NH4+-SO42{\textendash}H2O droplets}, journal = {Physical Chemistry Chemical Physics}, volume = {10}, number = {22}, year = {2008}, note = {ISI Document Delivery No.: 304MXTimes Cited: 7Cited Reference Count: 68Murray, Benjamin J. Bertram, Allan K.}, pages = {3287-3301}, type = {Article}, abstract = {Ice clouds in the Earth{\textquoteright}s upper troposphere can form via homogeneous nucleation of ice in aqueous droplets. In this study we investigate the crystallisation, or lack of crystallisation, of the solute phase and ice in aqueous (NH4)(3)H(SO4)(2)/H2O and NH4HSO4/H2O droplets. This is done using in situ X-ray diffraction of emulsified solution droplets mounted on a cold stage. From the diffraction patterns we are able to identify the phases of crystalline solute and ice that form after homogeneous freezing in micrometer sized droplets. An important finding from this study is that crystallisation of the solute does not always occur, even when crystallisation is strongly thermodynamically favoured. The nucleation and growth of solute phase crystals becomes inhibited since the viscosity of the aqueous brine most likely increases dramatically as the brine concentration increases and temperature decreases. If ice nucleates below a threshold freezing temperature, the brine appears to rapidly become so viscous that solute crystallisation is inhibited. This threshold temperature is 192 K and 180 K, in ( NH4) 3H( SO4) 2 and NH4HSO4, respectively. We also speculate that the formation of cubic ice within a highly viscous brine blocks the solvent mediated cubic to hexagonal phase transformation, thus stabilising the metastable cubic ice in the most concentrated solution droplets.}, keywords = {CUBIC ICE, GLASS-TRANSITION, H2SO4/NH3/H2O AEROSOL-PARTICLES, HOMOGENEOUS ICE NUCLEATION, LIQUID WATER, LOW-TEMPERATURES, NH4HSO4, PHASE-TRANSITIONS, solutions, SULFURIC-ACID, SUPERCOOLED WATER}, isbn = {1463-9076}, url = {://000256114700013}, author = {Murray, B. J. and Bertram, A. K.} } @article {3786, title = {Remarks on the forces between macroscopic particles in solution}, journal = {Berichte Der Bunsen-Gesellschaft-Physical Chemistry Chemical Physics}, volume = {100}, number = {6}, year = {1996}, note = {ISI Document Delivery No.: UW575Times Cited: 21Cited Reference Count: 221st International Symposium on Polyelectrolytes/Discussion Meeting of Deutsche-Bunsen-Gesellschaft-fur-Physikalische-Chemie on Polyelectrolytes in Solution and at InterfacesSEP 18-22, 1995POTSDAM, GERMANYDeut Bunsen Gesell Phys chem}, month = {Jun}, pages = {885-888}, type = {Proceedings Paper}, abstract = {Some interesting aspects of the forces acting between macroscopic objects (spheres and plates) immersed in solution are discussed. These include attractive forces between like-charged objects in primitive model electrolyte solutions, van der Waals forces in molecular solvents, and strong attractive interactions related to cavitation or separation-induced evaporation of liquids between inert or {\textquoteright}{\textquoteright}solvophobic{\textquoteright}{\textquoteright} walls.}, keywords = {ATTRACTION, COLLOIDAL PARTICLES, ELECTRICAL DOUBLE-LAYER, ELECTROLYTE SOLUTION, FLUIDS, HYDROPHOBIC SURFACES, HYPERNETTED-CHAIN APPROXIMATION, LENNARD-JONES, molecular interactions, MONTE-CARLO, solutions, SYMMETRICAL POISSON-BOLTZMANN}, isbn = {0005-9021}, url = {://A1996UW57500032}, author = {Patey, G. N.} } @article {6889, title = {QUANTUM PHENOMENA AND SOLVENT EFFECTS ON ADDITION OF HYDROGEN ISOTOPES TO BENZENE AND TO DIMETHYLBUTADIENE}, journal = {Berichte Der Bunsen-Gesellschaft-Physical Chemistry Chemical Physics}, volume = {94}, number = {11}, year = {1990}, note = {ISI Document Delivery No.: EU906Times Cited: 18Cited Reference Count: 4189TH GENERAL ASSEMBLY OF THE DEUTSCHE-BUNSEN-GESELLSCHAFT-FUR-PHYSIKALISCHE-CHEMIE ( ON THE 65TH BIRTHDAY OF THEODOR ACKERMANN ) : CHEMICAL ELEMENTAL REACTIONSMAY 24-26, 1990TUBINGEN, FED REP GERDEUT BUNSEN GESELL PHYS CHEM}, month = {Nov}, pages = {1224-1230}, type = {Proceedings Paper}, abstract = {Rate constants have been measured for the reaction of the light hydrogen isotope muonium with benzene and 2,3-dimethylbutadiene-1,3 in the gas phase and in several solvents. Comparison with H atom data reveals (1) appreciable kinetic isotope effects, (2) a strong contribution of tunnelling for the activated reaction with benzene, (3) encounter controlled reaction for Mu addition to the diene, (4) a mass dependence of the diffusion constant of hydrogen isotopes in solution, and (5) an enhancement of the rate constant in solution over that in the gas phase by a factor, except for water, of the inverse Ostwald solubility coefficient for hydrogen. The isotope-dependent reduction of the solvent effect in water is tentatively ascribed to the dynamics of the clathrate-like structure when the hydrogen atom reacts.}, keywords = {ATOM, DIFFUSION, electron, ELEMENTARY REACTIONS, GASES, ISOTOPE EFFECTS, KINETICS, LIQUIDS, muonium, radicals, RATE CONSTANTS, solutions, WATER}, isbn = {0005-9021}, url = {://A1990EU90600008}, author = {Roduner, E. and Louwrier, P. W. F. and Brinkman, G. A. and Garner, D. M. and Reid, I. D. and Arseneau, D. J. and Senba, M. and Fleming, Donald G.} }