A generalized approach for the fabrication of core/shell heteronanostructures through a simple chemical bath deposition method assisted by the bridging of SiO(2) spacer has been developed and a slow heterogeneous nucleation mechanism identified as the key to the success of this method.

Title of Document: CO-SOLVENT ASSISTED SPRAY PYROLYSIS FOR THE PREPARATION OF METAL MICROPARTILCE. Kai Zhong, Doctor of Philosophy, 2012 Directed By: Professor Sheryl H. Ehrman, Department of Chemical and Biomolecular Engineering Metal and bimetallic particles play an important role in catalytic, medical and electronic applications. Various techniques have been developed for the preparation of ...

Wet deposition is an important source of metals to the sea. The temporal variability of Hg concentrations in precipitation, and the impact of air masses of different origins over the Polish coastal zone were assessed. Samples of precipitation were collected (August 2008-May 2009) at an urbanized coastal station in Poland. Hg analyses were conducted using CVAFS. These were the first measurements...

In this study, ultrasonic-assisted matrix solid-phase dispersion (UA-MSPD) as a new sample preparation method for natural product analysis was developed. Influential parameters of the UA-MSPD method was optimized using oleuropein content of olive leaves as a model analyte. Main parameters of the proposed technique such as ultrasonic time, amplitude and pulse, sorbent material, the ratio of samp...

[1] Aeolian dust input may be a critical source of dissolved iron for phytoplankton growth in some oceanic regions. We used an atmospheric general circulation model (GCM) to simulate dust transport and removal by dry and wet deposition. Model results show extremely low dust concentrations over the equatorial Pacific and Southern Ocean. We find that wet deposition through precipitation scavengin...

Acid deposition is one of the most important environmental issues in East Asia including Japan. The long range transport of acidic species from Asian continent to Japan islands cause large amount of acid deposition especially in winter. These phenomena are strongly affected by the precipitation on the sea, however, it is not easy to get enough information on it. This study aims to develop a sim...

Kilauea Volcano on the Big Island of Hawaii may be an important source of bioavailable phosphorus to the Hawaiian Island Chain. Because it has been hypothesized that these volcanic islands undergo a shift from nitrogen to phosphorus limitation over geologic time, atmospheric phosphorus deposition could play a considerable role in ecosystem processes, especially on the older, more highly weather...

Retention of agricultural sprays on plant surfaces is an important challenge. Bouncing of sprayed pesticide droplets from leaves is a major source of soil and groundwater pollution and pesticide overuse. Here we report a method to increase droplet deposition through in-situ formation of hydrophilic surface defects that can arrest droplets during impact. Defects are created by simultaneously spr...

The renewed interest in plant-derived drugs has led to an increased need for efficient extraction methods. The present investigation was an attempt to evaluate and compare the conventional methods of extraction with non conventional methods of extraction, such as ultrasonic-assisted extraction (UAE) and microwave-assisted extraction (MAE) methods. Pterocarpus marsupium Roxb. has been reported t...