Adrian B. Mann, Associate Professor
Department of Materials Science and Engineering
Department of Biomedical Engineering
D. Phil. Materials
Oxford University, 1996
Nottingham University, 1989
Nottingham University, 1988
Materials Science and Engineering Department
607 Taylor Road
Rutgers - The State University of New Jersey
Piscataway, New Jersey 08854
Google Scholar: Adrian B Mann
The primary theme of my research is understanding the nanomechanical behavior of materials. I am particularly interested in the mechanics of nanocontacts and how mechanical behavior is affected by local variations in structure and chemistry. The studies span a wide range of materials from traditional metals and ceramics to biological tissues and organic crystals.
My background is in the physical sciences and my group uses a wide variety of physical characterization techniques to study nanomaterials. The instruments used include scanning probe microscopes (SPMs), nanoindentation systems, electron microscopes (TEM & SEM) and micro-Raman spectrometers. All of these instruments are available commercially, but frequently modifications and adaptations of the instruments are used to examine specific effects, for instance, the relationship between mechanical deformation and electrical properties or the effects of hydration on surface mechanical properties.
The research activities in my group can be split into the following four areas (follow the links below for relevant publications). In addition to these areas we are becoming increasingly involved in studies of organic crystals used in pharmaceutical and electronic applications:
BONE - nanomechanics, chemistry, structure AND TISSUE
Bone is a nanocomposite consisting of apatite crystals in a protein matrix. The protein is predominantly collagen, but there are many other non-collagenous bone proteins present including osteopontin, osteocalcin and fibrillin 1 & 2. We are examining the role of these proteins in determining the bone’s properties by studying bones from mice with specific single genes removed by genetic manipulation (knockout mouse models) and comparing these to their wildtype, background matched controls. The results show that each of the proteins is important in determining the bone’s properties, but their roles are very different. (publications)
dental tissues and dental materials
The oral cavity is
a hostile environment where large variations in pH and temperature occur
simultaneously with abrasive processes such as mastication
and erosion due to fluid flow. Given these extreme conditions it is amazing that
dental tissues such as enamel are able to survive
without serious damage for as long as 70 years or more, especially given that
dental enamel is not able to regenerate itself.
In our research we have been studying the properties of healthy enamel, carious
lesions and salivary pellicle. The research has
shown the dramatic effect of chemical agents such as tannins, fluorides and
organic acids on the nanomechanics of the tooth’s
Mechanics and geometry of nanoasperity contacts
When two surfaces are first brought into contact the interface between the surfaces consists of a series of individual nanoasperity contacts. The behavior of these nanoasperity contacts under mechanical loading is important in many processes including friction, wear, lubrication, thermal conduction and electrical conduction. We have been performing highly controlled experimental studies of the effects of surface chemistry, surface forces and kinetics on the mechanics and geometry of nanoasperity contacts. The experimental investigations are supported by analytical and numerical modeling. (publications)
Physical properties of nanocomposite ceramics, semiconductors and metals
The mechanical, electrical and thermal properties of many materials are intimately linked to each other and in addition they often show a strong dependence on the material’s structure. We have been studying these properties and their dependence on structure for many years and have identified a number of important phenomena including phase transformations, dislocation nucleation, rapid diffusion based reactions and mechanical failure at interfaces. (publications)
B.Mohanty, A.B.Mann, Chemomechanical effects of long-chain alcohols during nanoindentation, Journal of Materials Research, 27, 222-228 (2012).
J. Macione, N.B.Kavukcuoglu, R.S.A.Nesbitt, A.B.Mann, N.Guzelsu and S.P.Kotha, Hierarchies of damage induced loss of mechanical properties in calcified bone after in vivo fatigue loading of rat ulnae, Journal of the Mechanical Behavior of Biomedical Materials, 4, 841-848 (2011).
B.H.Kear, J.F.Al-Sharab, R.K.Sadangi, S.Deutsch, N.B.Kavukcuoglu, S.D.Tse, A.Mann, O.A.Voronov and C.S.Nordahl, On the Conversion of Bulk Polycrystalline Y2O3 into the Nanocrystalline State, Journal of the American Ceramic Society, 94, 1744-1746 (2011).