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Dive into the research topics where W. Geoffrey Chan is active.

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Featured researches published by W. Geoffrey Chan.


Journal of Analytical and Applied Pyrolysis | 2003

Physical characterization of the cigarette coal: part 1—smolder burn

Vicki L Baliga; Donald E. Miser; Ramesh K. Sharma; Michael E. Thurston; W. Geoffrey Chan; Mohammad R. Hajaligol

Abstract The morphology of the coal from the smoldering cigarette was characterized using light microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), inductively coupled plasma spectroscopy, and image analysis. The coal of the smoked cigarette was divided into four regions: the char positioned at and behind the char line of the cigarette paper, the coal base located just in front of the char line, the coal tip located in front of the coal base, and the ash that surrounded the exterior surface of the coal cone. The morphology of the char behind the coal consisted of tobacco shreds that transitioned from yellow to brown to black with changes in morphology from minimal surface damage to cuticle separation. The blackened area of the coal base contained shreds that exhibited vesicle formation to carbonized shells to inorganic encrustation of the shreds, all of which are characteristic morphologies of pyrolysis. Shreds within the coal tip region exhibited morphologies similar to those found in the coal base as well as progressive cell wall degradation through etching, morphology that is characteristic of oxidative pyrolysis. Shred structures from the ash region consisted of inorganic replicas of the tobacco shreds to materials that consisted of melts of inorganic components. Some of the potassium, sulfur, and sodium from the tobacco migrated into the gas stream.


Fuel | 2004

Characterization of chars from pyrolysis of lignin

Ramesh K. Sharma; Jan B. Wooten; Vicki L Baliga; Xuehao Lin; W. Geoffrey Chan; Mohammad R. Hajaligol


Journal of Analytical and Applied Pyrolysis | 2003

Low temperature mechanism for the formation of polycyclic aromatic hydrocarbons from the pyrolysis of cellulose

Thomas E. McGrath; W. Geoffrey Chan; Mohammad R. Hajaligol


Journal of Analytical and Applied Pyrolysis | 2003

Formation of low molecular weight heterocycles and polycyclic aromatic compounds (PACs) in the pyrolysis of α-amino acids

Ramesh K. Sharma; W. Geoffrey Chan; Jeffrey I. Seeman; Mohammad R. Hajaligol


Food and Chemical Toxicology | 2007

Formation of polycyclic aromatic hydrocarbons from tobacco: the link between low temperature residual solid (char) and PAH formation.

Thomas E. McGrath; Jan B. Wooten; W. Geoffrey Chan; Mohammad R. Hajaligol


Journal of Analytical and Applied Pyrolysis | 2004

On the role of peptides in the pyrolysis of amino acids

Ramesh K. Sharma; W. Geoffrey Chan; Jia Wang; Bruce E. Waymack; Jan B. Wooten; Jeffrey I. Seeman; Mohammad R. Hajaligol


Carbon | 2004

HRTEM investigation of some commercially available furnace carbon blacks

Weizhong Zhu; Donald E. Miser; W. Geoffrey Chan; Mohammad R. Hajaligol


Journal of Analytical and Applied Pyrolysis | 2006

Product compositions from pyrolysis of some aliphatic α-amino acids

Ramesh K. Sharma; W. Geoffrey Chan; Mohammad R. Hajaligol


Carbon | 2004

Characterization of combustion fullerene soot, C60, and mixed fullerene

Weizhong Zhu; Donald E. Miser; W. Geoffrey Chan; Mohammad R. Hajaligol


Applied Catalysis B-environmental | 2005

Catalytic cracking of catechols and hydroquinones in the presence of nano-particle iron oxide

Eun-Jae Shin; Donald E. Miser; W. Geoffrey Chan; Mohammad R. Hajaligol

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