Imperial College London


Faculty of EngineeringDepartment of Chemical Engineering

Reader in Particle Technology



+44 (0)20 7594 0784jerry.heng




417AACE ExtensionSouth Kensington Campus






Date Role


Reader in Particle Technology, Department of Chemical Engineering, Imperial College London


EPSRC Manufacturing the Future Early Career Fellow


Senior Lecturer, Department of Chemical Engineering, Imperial College London
2007-2011 Lecturer, Department of Chemical Engineering, Imperial College London
2006 Research Associate, Department of Chemical Engineering, Imperial College London, UK
2002-2006 PhD in Chemical Engineering, "Anisotropic Surface Properties of Crystalline Pharmaceutical Solids" Department of Chemical Engineering, Imperial College London, UK
1998-2002 B.Eng (Hons), Department of Chemical Engineering, Universiti Teknologi Malaysia, Malaysia

Research Interests

Principal areas of research:

  1. Develop approaches to control nucleation and crystallisation of small molecule organic organic solids (polymorphism).
  2. Develop biocrystallisation as a downstream bioseparation for purification and isolation of biopharmaceuticals
  3. Study the role of surface properties in processability and manufacturability of powders, including the effect of processing on powder properties.
  4. Developing methods to experimentally measure powder surface energy heterogeneity and models to determine surface energy distributions. 

Area 1: Approaches to Control Nucleation and Crystallisation of Small Molecules

My research group has demonstrated how the interface can be engineered to control crystallisation of polymorphs. The engineered surfaces we prepare have a combined feature of topography and surface chemistry. In this area of work, a polymorphic occurrence domain concept, TiPOD concept has been proposed to account for the influence of the interactions at the interface on the crystallisation of polymorphs.

Area 2: Biocrystallisation as a Downstream Separation Step

Progress has been made in the upstream production of biopharmaceuticals, though bottlenecks in downstream separations (DSB) of biopharmaceuticals still remains. Crystallisation of proteins, including biopharmaceuticals, has evolved to a stage where it is feasible to develop biocrystallisation as a downstream bioseparation for purification and isolation (increasing titer concentrations). Our work has demonstrated a “selective nucleation” concept, and coupled with flow crystallisation, can allow for the development of continuous biocrystallisation as an alternative to conventional DSB.

Area 3: Surface Properties in Processability and Manufacturability

A crystalline particle is typically assumed to be spherical and isotropic in surface properties. My work has demonstrated the highly facet specific properties of crystalline solids (anisotropic), evidenced experimentally for the first time for pharmaceutical solids. This area of work leads to an insight into the effect of processing (eg milling, crystallisation) on powder properties, the impact on processing (eg seeding, granulation, drying), and on the product performance (dissolution rate, fine particle fraction).

Area 4: Surface Energy Heterogeneity

My research here has developed approaches to determine powder surface energy heterogeneity and thermodynamics models to describe the surface energy site distribution. This gas chromatographic based technique is a more robust approach and provides a more complete description of the powder surface energy.


Surfaces and Particle Engineering Lab

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Scopus Profile

Selected Publications

Journal Articles

Shah UV, Williams DR, Heng JYY, 2012, Selective Crystallization of Proteins Using Engineered Nanonucleants, Crystal Growth & Design, Vol:12, ISSN:1528-7483, Pages:1362-1369

Parambil JV, Schaepertoens M, Williams DR, et al., 2011, Effects of Oscillatory Flow on the Nucleation and Crystallization of Insulin, Crystal Growth & Design, Vol:11, ISSN:1528-7483, Pages:4353-4359

Ho R, Muresan AS, Hebbink GA, et al., 2010, Influence of fines on the surface energy heterogeneity of lactose for pulmonary drug delivery, International Journal of Pharmaceutics, Vol:388, ISSN:0378-5173, Pages:88-94

Ho, R, Wilson, et al., 2009, Crystal Habits and the Variation in Surface Energy Heterogeneity, Crystal Growth & Design, Vol:9, Pages:4907-4911

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