The study of unique bubble/drop dynamics in hydrophobically modified alkali-soluble emulsion polymer solutions

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560180
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: The University of Tokushima
• Principal Investigator: OHTA MITSUHIRO 徳島大学, ソシオテクノサイエンス研究部, 教授 (00281866)
• Co-Investigator(Kenkyū-buntansha): IWATA Shuichi 名古屋工業大学, 大学院工学研究科, 准教授 (00293738)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 弾性特性 / 気泡運動 / 気泡形状 / マイクロ構造

Outline of Final Research Achievements

The motion of single bubbles freely rising hydrophobically modified alkali-soluble emulsion polymer (HASE) solutions are experimentally examined. In this study, HASE solutions with several different concentrations are prepared and the bubble rising motion in these HASE solutions are considered. The motion of bubbles with very unique shapes is observed, even though the profile of rheological properties doesn’t have special characteristics. The rising bubble in HASE solutions is quite different from bubbles with a cusped shape in water-soluble associative polymer solutions.
From a microscopic view, it is observed that fish backbone-type micro structures are formed at the unique shapes depending on physical properties and conditions. These microstructures are seldom visible to the naked eye. It is hypothesized that the mechanisms behind the formation of these microscopic structures are closely tied to the HASE elastic effect.

Free Research Field

流体工学