caa a22 4500 467949182 CHVBK 20180405193740.0 cr unu---uuuuu 170328e20050201xx s 000 0 eng 10.1023/B:CELL.0000049352.60007.76 doi (NATIONALLICENCE)springer-10.1023/B:CELL.0000049352.60007.76 (NATIONALLICENCE)springer-10.1007/s10570-004-4369-4 Novel visualization studies of lignocellulosic oxidation chemistry by application of C-near edge X-ray absorption fine structure spectroscopy [Elektronische Daten] [Douglas Mancosky, Lucian Lucia, Hiroki Nanko, Sue Wirick, Alan Rudie, Robert Braun] The research presented herein is the first attempt to probe the chemical nature of lignocellulosic samples by the application of carbon near edge X-ray absorption fine structure spectroscopy (C-NEXAFS). C-NEXAFS is a soft X-ray technique that principally provides selective interrogation of discrete atomic moieties using photoelectrons of variable energies. The X1A beam line of the National Synchrotron Light Source was employed for the specific purpose of observing carboxylic acid moieties that display a signature absorption band centered at 289eV. This study caps a larger effort to support the mechanistic basis for lignocellulosic fiber chemical degradation induced by the disproportionation of hydrogen peroxide during fiber bleaching trials. It is shown that fibers that have been bleached with a hydrogen peroxide phase without removal of resident pendant metals (Mn, Cu, Fe) sustain significant macroscopic damage likely via classical Fenton-type radical reactions, as evidenced by a tensile reduction by over 30%. We present X-ray absorption spectra obtained using a scanning transmission X-ray microscope (STXM) at the end of a 2.5GeV electron synchrotron that provided 1s→π* contrast-enhanced micrographs illustrating a random distribution of acid functionalities that were principally located on fiber surfaces. Control studies using non-bleached fibers demonstrated that very little signature carboxylic acid absorption patterns were present in the fibers, suggesting that these groups are an incriminating fingerprint for macroscopic fiber strength damage during non-radical suppressed bleaching trials. Kluwer Academic Publishers, 2005 Carboxylic acid functionalities nationallicence Hydrogen peroxide bleached pulp nationallicence X-ray absorption spectroscopy nationallicence Mancosky Douglas Hydro Dynamics, 8 Redmond Court, 30165, Rome, GA, USA aut Lucia Lucian Department of Wood and Paper Science, North Carolina State University, 3108 Biltmore Hall, Campus Box 8005, 27695-8005, Raleigh, NC, USA aut Nanko Hiroki Hydro Dynamics, 8 Redmond Court, 30165, Rome, GA, USA aut Wirick Sue Department of Physics, SUNY at Stony Brook, 11794, Stony Brook, NY, USA aut Rudie Alan USDA Forest Products Laboratory, One Gifford Pinchot Drive, 53726-2398, Madison, WI, USA aut Braun Robert Evans Phi Analytical, Eden Prarie, MN, USA aut Cellulose Kluwer Academic Publishers 12/1(2005-02-01), 35-41 0969-0239 12:1<35 2005 12 10570 https://doi.org/10.1023/B:CELL.0000049352.60007.76 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/B:CELL.0000049352.60007.76 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mancosky Douglas Hydro Dynamics, 8 Redmond Court, 30165, Rome, GA, USA aut NATIONALLICENCE 700 1- Lucia Lucian Department of Wood and Paper Science, North Carolina State University, 3108 Biltmore Hall, Campus Box 8005, 27695-8005, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Nanko Hiroki Hydro Dynamics, 8 Redmond Court, 30165, Rome, GA, USA aut NATIONALLICENCE 700 1- Wirick Sue Department of Physics, SUNY at Stony Brook, 11794, Stony Brook, NY, USA aut NATIONALLICENCE 700 1- Rudie Alan USDA Forest Products Laboratory, One Gifford Pinchot Drive, 53726-2398, Madison, WI, USA aut NATIONALLICENCE 700 1- Braun Robert Evans Phi Analytical, Eden Prarie, MN, USA aut NATIONALLICENCE 773 0- Cellulose Kluwer Academic Publishers 12/1(2005-02-01), 35-41 0969-0239 12:1<35 2005 12 10570 NATIONALLICENCE 856 40 https://doi.org/10.1007/s10570-004-4369-4 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer