Stay updated with breaking news from Ollision toronto. Get real-time updates on events, politics, business, and more. Visit us for reliable news and exclusive interviews.
Hypothesis: Naturally extracted polysaccharides, such as guar gum, are promising candidates for environmentally friendly flotation reagents. It is hypothesized that the kinetics of collision of sub- to millimeter gas bubbles with a hydrophobic graphite surface, and the stability of thin liquid film formed between the bubble and surface is affected by an adsorbed layer of guar gum. Experiments: A combination of gravimetric (quartz crystal microbalance with dissipation) and imaging (atomic force microscopy) techniques was used to investigate the adsorption of guar gum on graphite surface, while high-speed camera imaging allowed for direct observation of the bubble collision process with guar gum-modified graphite surfaces with millisecond resolution. Findings: Atomic force microscope topography images revealed a guar gum concentration-dependent interconnected network of guar gum molecules adsorbed at graphite surface. These adsorbed molecules at low surface coverage, changed the wettability of the graphite surface, resulting in a film drainage time longer by an order of magnitude, while at higher surface coverage successfully prevented bubble attachment to the graphite surface. Most importantly, the adsorbed layer changed the strength of the bubble's bouncing off the graphite surface. This enhanced bubble bouncing can be correlated with the film drainage time and used to predict a successful bubble-particle attachment.
Maryland Transportation Secretary Paul Wiedefeld said Tuesday morning that eight people were on the Francis Scott Key Bridge in Baltimore when a container ship rammed into one of its supports, causing the bridge to collapse into the frigid Patapsco River below.
A witness told investigators that they saw a hatchback reverse into a parked SUV. They also saw the driver and passenger switch seats in the hatchback before fleeing.
Japanese investigators have determined that a collision during a nighttime drill caused the deadly crash last month of two Japanese navy SH-60K Seahawk helicopters, the country's defense minister said Thursday. Kihara ruled out mechanical failure of the SH-60K Seahawks from the Maritime Self Defense Force and announced that the exercises, which were halted following the crash, would resume on Friday.