Tube Formation in Reverse Silica Gardens

详细信息    查看全文

• 作者：Jason J. Pagano ; Tamá ; s Bá ; nsá ; gi ; Jr. ; Oliver Steinbock
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：July 5, 2007
• 年：2007
• 卷：111
• 期：26
• 页码：9324 - 9329
• 全文大小：279K
• 年卷期：v.111,no.26(July 5, 2007)
• ISSN：1932-7455

文摘

The flow injection of sodium silicate solution into a large reservoir of lighter cupric sulfate solution createssingle, downward growing precipitation tubes. These hollow structures have diameters in the range of 0.8-2.4 mm and can grow several centimeters in length. Four distinct growth regimes are observed, and theirstability in terms of flow rate and cupric sulfate concentration is investigated. Three of these growth regimesresemble behavior reported earlier for the injection of cupric sulfate into silicate solution. However the "reverse"conditions studied here reveal one distinctly different regime in which tube growth is limited by repetitivefracturing. The lengths of the broken-off tube segments and the times between subsequent break-off eventscan be described by log-normal distributions.