Carbon nanoparticles (CNPs) (6-18 nm in size) were prepared by refluxing corn stalk soot in nitric acid. The obtained acid-oxidized CNPs are soluble in water due to the existence of carboxylic and hydroxyl groups. (13)C NMR measurement shows the CNPs are mainly of sp(2) and sp(3) carbon structure different from CNPs obtained from candle soot and natural gas soot. Furthermore, these CNPs exhibit...

INTRODUCTION Recent laboratory studies and model results indicated a possible effect of soot surface reactions on the nitrogen partitioning in the troposphere [Kalberer et al., 1996; Hauglustaine et al., 1997; Rogaski et al., 1997] and on the stratospheric [Lary et al., 1997] and tropospheric ozone concentrations [Bekki et al., 1997]. However, the model predictions are still speculative because...

Carbon black or soot is a carbon rich material which is widely used as a modifier and filler. Usually carbon black is produced via thermal decomposition of heavy <span style="font-size: 10pt; color: #0...

Title of Document: PROBING ATMOSPHERIC AEROSOL AND GAS PROPERTIES WITH PHOTOACOUSTIC SPECTROSCOPY Pedro Antonio Bueno, Jr., Doctor of Philosophy, 2011 Directed By: Professor, Michael R. Zachariah, Department of Mechanical Engineering and Chemistry Professor, Russell R. Dickerson, Department of Atmospheric and Oceanic Science and Chemistry Absorption by atmospheric aerosols is the wild card for ...

This paper examines the incremental global climate response of black carbon (BC), the main component of soot, due to absorption and scattering by BC inclusions within cloud and precipitation particles. Modeled soot is emitted as an externally mixed aerosol particle. It evolves to an internal mixture through condensation, hydration, dissolution, dissociation, crystallization, aqueous chemistry, ...

Experimental difficulties in following the soot formation and oxidation processes in the environment of diesel engines are recognised in the high values of the in-chamber temperature and pressure and the presence of extremely reactive intermediate species. At present, optical techniques have overwhelmed lacks typical of both local in-cylinder and totalcylinder samplings, which allow a high temp...

Thirty-nine brain-dead donors were studied during a 5-month period between April and August 1988. The age of the donors ranged from 12 to 42 years (mean 24.1 years); 26 were male (66.7%). The causes of brain death among the donors consisted of closed head irijury in 21 (53.8%), gun-shot in 9 (23.1%), subarachnoid hemorrhage in 5 (12.8%), and others in 4 donors (10.3%). The allografts were store...

Ash deposition on heat transfer surfaces is still a significant problem in coal-fired power plant utility boilers. The effective ways to deal with this problem are accurate on-line monitoring of ash fouling and soot-blowing. In this paper, an online ash fouling monitoring model based on dynamic mass and energy balance method is developed and key variables analysis technique is introduced to stu...

In this work, several nanostructured ceria catalysts were prepared by means of a hydrothermal procedure, in which the synthesis conditions (i.e., temperature and pH values) were varied. CeO2 samples of different shapes and structural properties were obtained, namely cubes, rods, cube and nanorod mixtures, and other polyhedra. The prepared materials were tested using four probe catalytic reactio...

We determined the carbon structures in condensed soot samples of variable C/H ratio by using both scanning and transmission electronmicroscopy.We identified several types of carbon structures. All the samples are formedmainly by “chainlike aggregates” of amorphous grains. A small amount of more ordered forms of carbon is also detected. A “poorly graphitized carbon” is formed on a pre-existing a...