ICMENS 2018

 

 

Keynote Speakers 


 

 

Keynote Speaker I

 

 

Prof. Jimmy C. M. YU, The Chinese University of Hong Kong, Hong Kong

Speech Title: Carbon Based Photocatalysts from Biomass for Environmental Applications

Abstract: Carbohydrates in biomass can be converted to semiconductive hydrothermal carbonation carbon (HTCC), a material that contains plenty of sp2-hybridization structures. Under solar light illumination, HTCC generates photoexcited electrons, holes and hydroxyl radicals. These species can be used for photocatalytic treatment such as water disinfection and degradation of organic pollutants. HTCC nanosheets can also be prepared from carbohydrates under hydrothermal conditions. The nanosheets are extremely active for photocatalytic disinfection compared to its bulk counterpart. When coupled to a hematite photoanode, the efficiency for water splitting and organic dye degradation can be greatly enhanced. In addition to monosaccharide (glucose), disaccharide (sucrose) and polysaccharide (starch), we have also transformed crops (e.g. rice), plants (e.g. grass), and even agricultural waste (e.g. straw) and animal waste (e.g. cow dung). This conversion of carbohydrates to HTCC may be considered as a “Trash to Treasure” approach.

Biography: Jimmy Yu is Choh-Ming Li Professor of Chemistry at The Chinese University of Hong Kong. He graduated from St. Martin’s College in 1980, and received a PhD from the University of Idaho in 1985. He joined the Department of Chemistry at CUHK in 1995 as an associate professor, and was promoted to professor in 2002. Professor Yu is a leading scientist in the field of photocatalysis. He is a prolific writer who also holds several patents on photocatalytic nanomaterials. Professor Yu is now Head of United College and Associate Director of the Institute of Environment, Energy and Sustainability.

 

 

 

Keynote Speaker II

 

Prof. Richard G. Haverkamp, Massey University, New Zealand

Speech title: Modifying collagen fibril structural arrangement to increase strength

 Professor Richard Haverkamp holds a Personal Chair in Nanotechnology at Massey University in New Zealand and teaches in the School of Engineering and Advanced Technology. His research covers nanostructure and mechanical relationships in collagen materials, nanomaterials for electrochemical processes, and materials from mineral resources. He makes extensive use of a variety of synchrotron techniques, most often at the Australian Synchrotron. He graduated with a PhD from the University of Auckland, New Zealand, and he has held visiting research positions at NTNU, Trondheim, Norway and MIT, Cambridge, USA. He has published about 100 journal papers and received a number of awards including the President’s Medal from the Institute of Professional Engineers NZ, and the Gold Award from the Ministry of Innovation Business and Employment, NZ. He has received research funding from government and industry sources from NZ, US, Norway, Australia, France, Canada, Taiwan and Japan.

 

Keynote Speaker III

 

Prof. C. W. Lim, City University of Hong Kong, Hong Kong

Speech Title: Thermo-Acoustic Radiation of Free-standing Nano-thin Film in Viscous Fluid

 

Abstract: Thermo-acoustic (TA) effect did not attract very much attention in the past.  Morse and Ingard [1] derived the coupled thermo-acoustic governing equations in 1968.  In 2008, Xiao et al. [2] conducted thermo-acoustic experiment for carbon nanotube projectors in air and further in 2010, Aliev et al. [3] extended the work of Xiao [2] underwater.  Hu et al. [4] put forward a theoretical explanation on thermo-acoustic emission of different kinds of sound source without taking the influence of heat capacity into consideration.  Lim et al. [5] derived and presented thermo-acoustic wave generation for free-standing CNT thin film ignoring the viscosity of fluid.

In this talk, further works on thermo-acoustic wave emission and propagation in viscous media are discussed. The fully coupled thermo-acoustic field is obtained for a free-standing nano-thin film in viscous fluid, which has been usually ignored in the previous works on thermo-acoustic interaction.  The influence of heat loss, heat capacity and heat exchange is considered in this investigation.  When a sinusoidal alternating current acts on the thin film, the double frequency effect can be determined easily.  Subsequently, the thermal wave propagation is decoupled from the acoustic effect by improving the order of differential equations. Then, with appropriate simplification an analytical prediction is derived in which the attenuation coefficient and the classic expression are identical.  In addition, the theoretical results agree well with experiment.  Compared with Lim et al. [5], an analytical solution of higher-order accuracy is obtained.  This work may be helpful to the design of the thermo-acoustic projectors that have shown great potentials for new underwater sonars compared with the electro-acoustic ones traditionally induced by membrane vibration.

References

[1] Morse P M and Ingard K U. Theoretical acoustics, Princeton University Press, 1968.

[2]  Xiao L, Chen Z, Feng C, et al. Flexible, Stretchable, Transparent Carbon Nanotube Thin Film Loudspeakers, Nano Letters, 2008, 8(12), 4539-4545.

[3] Aliev A E, et al. Underwater Sound Generation Using Carbon Nanotube Projectors, Nano Let, 2010, 10(7), 2374-2380.

[4] Hu H, Zhu T, Xu J. Model for thermoacoustic emission from solids, Appl. Phys. Let., 2010, 96(21), 214101.

[5] C.W. Lim, L.H. Tong and Y.C. Li, Theory of suspended carbon nanotube thinfilm as a thermal-acoustic source, J. Sound and Vib, 2013, 332(21), 5451-5461.

Biography: Currently a fellow of ASME, ASCE, EMI, HKIE and ISEAM, Ir Professor Lim received a BEng from Univ of Tech. of Malaysia, MEng and PhD from National Univ of Singapore and Nanyang Tech. Univ., respectively.  Prior to joining CityU, he was a post-doctoral research fellow at Dept of Civil Eng, The Univ of Queensland and Dept of Mech Eng, The Univ of HK.  Professor Lim is also a visiting professor at various universities including the Univ of Western Sydney, Dalian Univ of Tech., Huazhong Univ of Science and Tech., etc.  He has expertise in vibration of plate and shell structures, dynamics of smart piezoelectric structures, nanomechanics and symplectic elasticity.  He is one of the editors for JoMMS, Assoc Editor (Asia-Pacific Region) for JVET, Assoc Editor for IJBC, subject editor for AMM, etc. and also on the editorial board of a few other international journals.  He has published one very well-selling title in Engineering Mechanics entitled “Symplectic Elasticity” and co-authored with W.A. Yao and W.X. Zhong from Dalian Univ of Tech., as recorded in April 2010 by the publisher, World Scientific.  He has published more than 250 international journal papers, accumulated more than 3800 independent citations and has an ISI H-index 35.  One of his papers was granted the IJSS 2004-2008 most cited article award.  He was also awarded Top Referees in 2009, Proc. A, The Royal Society.  Professor Lim is also a registered professional engineer in HK.