Liposomes are lipid nanoparticles that widely used for drug and gene delivery in solution.  Researchers in the Lenhert group have recently demonstrated that microarrays made of lipids printed onto a surface can be used for determining drug efficacy on cell culture models.  The figure below shows an illustration of the process.  The paper published in the journal Biomaterials (2012) demonstrates a first step toward producing a single high-throughput liposome-based screening microarray plate that can be used in the same way as a standard well plate.