Galinstan

Galinstan is a brand name for a eutectic alloy composed of gallium, indium, and tin which melts at −19 °C (−2 °F) and is thus liquid at room temperature.[1] More loosely, galinstan is also used as a common name for various similar alloys which typically melt at +11 °C (52 °F).

Galinstan is composed of 68.5% Ga, 21.5% In, and 10.0% Sn (by weight).[2]

Due to the low toxicity and low reactivity of its component metals, in many applications, galinstan has replaced the toxic liquid mercury or the reactive NaK (sodium–potassium alloy).

Name

The name "Galinstan" is a portmanteau of gallium, indium, and stannum (Latin for "tin").

The brand name "Galinstan" is a registered trademark of the German company Geratherm Medical AG.

Physical properties
Galinstan from a broken thermometer, easily wetting a piece of glass

Galinstan tends to wet and adhere to many materials, including glass, which limits its use compared to mercury.

Uses

The non-toxic galinstan replaces mercury in thermometers; the tube interior must be coated with gallium oxide to prevent it from wetting the glass.

Galinstan has higher reflectivity and lower density than mercury. In astronomy, it can replace mercury in liquid-mirror telescopes.[9]

Metals or alloys like galinstan that are liquids at room temperature are often used by overclockers and enthusiasts as a thermal interface for computer hardware cooling, where their higher thermal conductivity compared to thermal pastes and thermal epoxys can allow slightly higher clock speeds and CPU processing power achieved in demonstrations and competitive overclocking. Two examples are Thermal Grizzly Conductonaut and Coolaboratory Liquid Ultra, with thermal conductivities of 73 and 38.4 W/mK respectively.[10][11] They must be carefully applied, unlike ordinary thermal compounds which require little finesse and are without significant risk if a mistake occurs during application, if the application was done sloppily, or accidentally applied to components such as aluminum heatsinks which are quite common and are completely and extensively destroyed by gallium. In August 2020, Sony Interactive Entertainment patented a galinstan-based thermal interface solution suitable for mass production,[12] for use on the PlayStation 5.

Galinstan is difficult to use for cooling fission-based nuclear reactors, because indium has a high absorption cross section for thermal neutrons, efficiently absorbing them and inhibiting the fission reaction. Conversely, it is being investigated as a possible coolant for fusion reactors. Its nonreactivity makes it safer than other liquid metals, such as lithium and mercury.[13]

X-ray equipment

Extremely high-intensity sources of 9.25 keV X-rays (gallium K-alpha line) for X-ray phase microscopy of fixed tissue (such as mouse brain), from a focal spot about 10 μm × 10 μm, and 3-D voxels of about one cubic micrometer, may be obtained with an X-ray source that uses a liquid-metal galinstan anode.[14] The metal flows from a nozzle downward at a high speed, and the high-intensity electron source is focused upon it. The rapid flow of metal carries current, but the physical flow prevents a great deal of anode heating (due to forced-convective heat removal), and the high boiling point of galinstan inhibits vaporization of the anode.[15]

See also

References
  1. Surmann, P; Zeyat, H (Nov 2005). "Voltammetric analysis using a self-renewable non-mercury electrode". Analytical and Bioanalytical Chemistry. 383 (6): 1009–1013. doi:10.1007/s00216-005-0069-7. PMID 16228199.
  2. Liu, Jing (2018-07-14). "Ch 5 Preparations and Characterizations of Functional Liquid Metal Materials". Liquid metal biomaterials : principles and applications. Yi, Liting. Singapore. p. 96. ISBN 9789811056079. OCLC 1044746336.
  3. ZHANG (2019). "Characterization of Triboelectric Nanogenerators". Flexible and stretchable triboelectric nanogenerator devices – toward self-powered ... systems. WILEY. p. 70. ISBN 978-3527345724. OCLC 1031449827.
  4. "Experimental Investigations of Electromagnetic Instabilities of Free Surfaces in a Liquid Metal Drop" (PDF). International Scientific Colloquium Modelling for Electromagnetic Processing, Hannover. March 24–26, 2003. Retrieved 2009-08-08.
  5. Liu, Tingyi; Kim, Chang-Jin "CJ" (2012). "Characterization of Nontoxic Liquid-Metal Alloy Galinstan for Applications in Microdevices". Journal of Microelectromechanical Systems. 21 (2): 448. CiteSeerX 10.1.1.703.4444. doi:10.1109/JMEMS.2011.2174421.
  6. Jeong, Seung Hee; Hagman, Anton; Hjort, Klas; Jobs, Magnus; Sundqvist, Johan; Wu, Zhigang (2012). "Liquid alloy printing of microfluidic stretchable electronics". Lab on a Chip. 12 (22): 4657–64. doi:10.1039/c2lc40628d. ISSN 1473-0197. PMID 23038427.
  7. Handschuh-Wang, Stephan; Chen, Yuzhen; Zhu, Lifei; Zhou, Xuechang (2018-06-20). "Analysis and Transformations of Room-Temperature Liquid Metal Interfaces – A Closer Look through Interfacial Tension". ChemPhysChem. 19 (13): 1584–1592. doi:10.1002/cphc.201800559. ISSN 1439-4235.
  8. Hodes, Marc; Zhang, Rui; Steigerwalt Lam, Lisa; Wilcoxon, Ross; Lower, Nate (2014). "On the Potential of Galinstan-Based Minichannel and Minigap Cooling". IEEE Transactions on Components, Packaging and Manufacturing Technology. 4 (1): 46–56. doi:10.1109/tcpmt.2013.2274699. ISSN 2156-3950.
  9. Minerals Yearbook Metals and Minerals 2010 Volume I. Government Printing Office. 2010. p. 48.4. Extract of page 48.4
  10. "Thermal Grizzly High Performance Cooling Solutions – Conductonaut". Thermal Grizzly. Retrieved 2019-12-18.
  11. Wallossek 2013-10-21T06:00:01Z, Igor. "Thermal Paste Comparison, Part Two: 39 Products Get Tested". Tom's Hardware. Retrieved 2019-12-18.
  12. "WIPO Patentscope: "WO2020162417 - Electronic apparatus, semiconductor device, insulating sheet, and method for manufacturing semiconductor device". Retrieved 2020-10-24.
  13. Lee C. Cadwallader (2003). "Gallium Safety in the Laboratory" (preprint). Cite journal requires |journal= (help)
  14. Hemberg, O.; Otendal, M.; Hertz, H. M. (2003). "Liquid-metal-jet anode electron-impact x-ray source". Appl. Phys. Lett. 83: 1483. doi:10.1063/1.1602157.
  15. Töpperwien, M.; et al. (2017). "Three-dimensional mouse brain cytoarchitecture revealed by laboratory-based x-ray phase-contrast tomography". Sci. Rep. 7: 42847. doi:10.1038/srep42847.

Sources
  • Scharmann, F.; Cherkashinin, G.; Breternitz, V.; Knedlik, Ch.; Hartung, G.; Weber, Th.; Schaefer, J. A. (2004). "Viscosity effect on GaInSn studied by XPS". Surface and Interface Analysis. 36 (8): 981. doi:10.1002/sia.1817.
  • Dickey, Michael D.; Chiechi, Ryan C.; Larsen, Ryan J.; Weiss, Emily A.; Weitz, David A.; Whitesides, George M. (2008). "Eutectic Gallium-Indium (EGaIn): A Liquid Metal Alloy for the Formation of Stable Structures in Microchannels at Room Temperature". Advanced Functional Materials. 18 (7): 1097. doi:10.1002/adfm.200701216.
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