Here is a recent work on the Poisson's ratio of carbon nanotube sheet [1]. From the experimental results, the researchers found that the Poisson's ratio could change from 0.06 to -0.20 as the content of MWNTs increasing from 0~100%. The interesting zero Poisson's ratio and auxetic materials were thus found.  

Ref. [1] Sign Change of Poisson's Ratio for Carbon Nanotube Sheets. Science 25 April 2008: 504-507

Ying Li

Department of Engineering Mechanics, Tsinghua University

Many studies on the thin film/substrate structure and its failure mechanism were reported in recent years. The direct experimental results of thin film/substrate structure by scanning electron microscopy (SEM) presents an intriguing problem:there exists a buckling failure mechanism at the lateral edge of metal film under pure bending. The qualitative theoretical analysis has been done on such buckling failure of thin film/substrate structure. The experimental results and theoretical analysis are helpful to understand the extrinsic stresses or deformations that are induced by external physical effects. Accepted by Appl. Phys. Lett.

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我国著名力学家、中国力学学会原常务理事、甘肃省力学学会原理事长、甘肃省政协原常委
、甘肃省科协原常委、兰州大学力学专业和学科的创始人、兰州大学力学系首任主任、名誉
主任叶开沅先生因病医治无效，于2007年10月20日15时30分在北京不幸逝世，享年82岁。
　　叶开沅，男，汉族，1926年5月19日出生于浙江省衢州市。1938年至1943年，在浙江省
立衢州中学学习。1944年，到北京灯市口育英中学学习。1945年考入北京大学土木工程系，
旋即转入燕京大学数学系学习。1946年，进入唐山工程学院学习，1947年转入清华大学电机