title: A new theranostic system based on gold nanocages and phase-change materials with unique features for photoacoustic imaging and controlled release.
abstract: This communication reports a new theranostic system with a combination of capabilities to both enhance the contrast of photoacoustic (PA) imaging and control the release of a chemical or biological effector by high-intensity focused ultrasound (HIFU). The fabrication of this system simply involves filling the hollow interiors of gold nanocages with a phase-change material (PCM) such as 1-tetradecanol that has a melting point of 38-39 °C. The PCM can be premixed and thus loaded with a dye, as well as other chemical or biological effectors. When exposed to direct heating or HIFU, the PCM will melt and escape from the interiors of nanocages through small pores on the surface, concurrently releasing the encapsulated molecules into the surrounding medium. We can control the release profile by varying the power of HIFU, the duration of exposure to HIFU, or both.
authors.affiliation: Department of Biomedical Engineering, Washington University, St. Louis, Missouri 63130, USA.
authors.forename: Geon Dae
authors.initials: GD
authors.lastname: Moon
authors.forename: Sung-Wook
authors.initials: SW
authors.lastname: Choi
authors.forename: Xin
authors.initials: X
authors.lastname: Cai
authors.forename: Weiyang
authors.initials: W
authors.lastname: Li
authors.forename: Eun Chul
authors.initials: EC
authors.lastname: Cho
authors.forename: Unyong
authors.initials: U
authors.lastname: Jeong
authors.forename: Lihong V
authors.initials: LV
authors.lastname: Wang
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D016503:Drug Delivery Systems; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D057054:Molecular Imaging; D010316:Particle Size; D004364:Pharmaceutical Preparations / Q000737:chemistry; D044367:Phase Transition; D013499:Surface Properties; D013696:Temperature
chemical_list: D000438:Alcohols; D004364:Pharmaceutical Preparations; D006046:Gold