wyg\u0142osi wyk\u0142ad w j\u0119zyku angielskim pt.<\/p>\n
Temperature of Maximum Density for Water and Aqueous Solutions<\/b><\/h2>\n
\nWater is the most important liquid from the human perspective. Surprisingly, the physical behavior of water strongly departs from other liquids, showing an unusual behavior in many of its properties. The maximum of density, which for pure water is achieved at around 4 C at the atmospheric pressure, is the most widely known among these physical anomalies. At present, it is an accepted that this maximum comes from a competition between two forms of water: one characterized by a highly ordered hydrogen-bonded structure, less dense and prevalent at low temperature, and the other one, less structured, denser, and prevalent at high temperature. The addition of solutes distorts the hydrogen bonded structure of water, modifing the location of the temperature of maximum density (TMD) – an experimental fact noted as far back as XIX century [1]. The amount of the variation in the TMD depends on the solute concentration and also on its chemical nature. Usually, TMD goes to lower temperatures, decreasing as solute concentrations increases. However, some chemicals, mainly short chain alcohols, slightly
\nincrease the TMD. A significant amount of new experimental works have been carried out
\nrecently [2-4], allowing to see a wider perspective.
\nDuring the seminar we shall review the recent results comprising a variety of inorganic and organic solvents and the effect of pressure over the TMD. <\/p>\n
Acknowledgment
\nThe author acknowledges financial support from the Spanish Ministry of Science and Innovation under Grant No. PID2020-115722GB-C22.<\/p>\n
References
\n1. M. C. Despretz, Ann. Chim. Phys. 70 (1839) 49-81.
\n2. J. Troncoso, Fluid Phase Equilibr. 549 (2021) 113191.
\n3. D. Gonz\u00e1lez-Salgado, et al., J. Chem. Phys. 156 (2022) 154502.
\n4. F. G\u00e1mez, et al., J. Mol. Liq. 377 (2023) 121433<\/p>\n
Streszczenie po polsku w ogromnym skr\u00f3cie:
\nWoda jest p\u0142ynem o najwi\u0119kszym znaczeniu dla ludzko\u015bci. Jej w\u0142asno\u015bci fizyczne, a w szczeg\u00f3lno\u015bci temperatura najwi\u0119kszej g\u0119sto\u015bci (TMD) znacznie odbiegaj\u0105 od pozosta\u0142ych cieczy. Pod normalnym ci\u015bnieniem najwi\u0119ksza g\u0119sto\u015b\u0107 osi\u0105gana jest oko\u0142o temperatury 4 stopni C. Rozpuszczanie w wodzie substancji mo\u017ce zar\u00f3wno TMD obni\u017ca\u0107 jak i podwy\u017csza\u0107 [1] (np. alkohole o kr\u00f3tkim \u0142a\u0144cuchu w\u0119glowym), za co odpowiedzialne s\u0105 g\u0142\u00f3wnie wi\u0105zania wodorowe. Badania przeprowadzone w ostatnim okresie [2-4] pozwoli\u0142y jednak zrozumienie tego zjawiska w znacznie szerszej perspektywie, kt\u00f3ra przedstawiona zostanie czasie seminarium.<\/p>\n
Konwersatorium odb\u0119dzie si\u0119 hybrydowo we wtorek 9.05.2025 r. <\/b>o godz. 1600<\/sup> w sali P\/0\/05, w budynku SMCEBI w Chorzowie oraz poprzez platform\u0119 Teams. Szczeg\u00f3\u0142y podamy wkr\u00f3tce. Link do transmisji: Teams <\/a>.<\/p>\n \n <\/center><\/p>\n","protected":false},"excerpt":{"rendered":" Polskie Towarzystwo Fizyczne Oddzia\u0142 w Katowicach zaprasza na seminarium naukowe, na kt\u00f3rym: dr Jacobo Troncoso \u00a0Departamento de F\u00edsica Aplicada, Universidad de Vigo wyg\u0142osi wyk\u0142ad w j\u0119zyku angielskim pt. Temperature of Maximum Density for Water and Aqueous Solutions Water is the most important liquid from the human perspective. Surprisingly, the physical behavior of water strongly departs … Czytaj dalej 9.05.2023 – Seminarium naukowe PTF – dr Jacobo Troncoso (U. de Vigo, Hiszpania)<\/span>
\nDo transmisji w Teams mo\u017cna si\u0119 b\u0119dzie \u0142\u0105czy\u0107 od godz. 15:30.
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