* Corresponding authors

^a The Forest Products Laboratory, US Forest Service, Madison, WI, USA

^b Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
E-mail: [email protected]
Fax: 1-765-496-8299
Tel: 1-765-496-3397

^c School of Materials Engineering, Purdue University, West Lafayette, IN, USA
E-mail: [email protected]
Fax: 1-765-496-1204
Tel: 1-765-496-2294

^d School of Mechanical Engineering, Purdue University, West Lafayette, IN, USA

^e Department of Wood Science and Engineering, Oregon State University, OR, USA

^f Department of Forestry, Oregon State University, OR, USA