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About Elements

田中贵金属是贵金属领域的翘楚企业。
支撑社会发展的先进素材和解决方案、
创造了这些的开发故事、技术人员们的心声、以及经营理念和愿景——
Elements是以“探求贵金属的极致”为标语,
为促进实现更加美好的社会和富饶的地球未来传播洞察的网络媒体。

Elements

通过先进素材支撑社会发展
田中贵金属的信息传播媒体

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Tears of Wine and Palladium-coated Copper Wire: The Marangoni Effect

Tears of Wine and Palladium-coated Copper Wire: The Marangoni Effect

Semiconductor Digest March 2024

DODGIE CALPITO and YUMI SHIMADA, Tanaka Kikinzoku International (America),
Inc. TAKESHI KUWAHARA, Tanaka Denshi Kogyo K.K. (Japan)

Mixing of palladium and copper within conventional palladium-coated copper wires is explained by the Marangoni effect. Proprietary dopants can counter this effect.

TEARS OF WINE ARE THE CLEAR LIQUID

rising and eventually falling inside of a glass filled with wine as shown in FIGURE 1. This is caused by water flowing away from evaporating alcohol because of differences in their surface tension. Water, with a higher surface tension, climbs up the glass wall by capillary action away from the alcohol-water mixture in wine. This is known as the Marangoni Effect named after physicist Carlo Giuseppe Matteo Marangoni who studied the reaction of oil on water in the 1860s. An illustration of this effect on mixed materials at the application of heat is shown in FIGURE 2.

In thermosonic wire bonding, the most common method of interconnecting semiconductors, the Marangoni Effect is hypothesized to be the mechanism in the creation of the Free-Air Ball (FAB). The FAB is the spherical end of the wire molten by electric discharge that is then pressed and ultrasonically welded to the device to make the first bond of the interconnection.

Figure 1. Tears of wine flowing down inside a glass of wine blurring a lady's face behind it.
Figure 1. Tears of wine flowing down inside a glass of wine blurring a lady’s face behind it.
Figure 2. The Marangoni Effect explains the flow of component materials
Figure 2. The Marangoni Effect explains the flow of component materials from high-temperature/low-surface tension towards low-temperature/high-surface tension in liquid phase.
Source : https://iss.jaxa.jp/kiboexp/theme/first/marangoni/haikei.html

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