A5024398640- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Plasmonic and Surface Plasmon Research
- Polymer Surface Interaction Studies
- Orbital Angular Momentum in Optics
- 3D Printing in Biomedical Research
- Photonic and Optical Devices
- Pickering emulsions and particle stabilization
- Microfluidic and Bio-sensing Technologies
- Near-Field Optical Microscopy
- Supramolecular Self-Assembly in Materials
- Nanocluster Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Fiber Laser Technologies
- Electrowetting and Microfluidic Technologies
- Electrospun Nanofibers in Biomedical Applications
- Solar and Space Plasma Dynamics
- Bone Tissue Engineering Materials
- Nanoparticle-Based Drug Delivery
- Modular Robots and Swarm Intelligence
- Advanced biosensing and bioanalysis techniques
- Metamaterials and Metasurfaces Applications
- Origins and Evolution of Life
- Conducting polymers and applications
- Photonic Crystals and Applications
California Institute of Technology
2019-2023
University of Michigan
2008-2019
BioSurfaces (United States)
2015-2019
University of California, Los Angeles
2003
Chiral nanostructures from metals and semiconductors attract wide interest as components for polarization-enabled optoelectronic devices. Similarly to other fields of nanotechnology, graphene-based materials can greatly enrich physical chemical phenomena associated with optical electronic properties chiral facilitate their applications in biology well areas. Here, we report that covalent attachment l/d-cysteine moieties the edges graphene quantum dots (GQDs) leads helical buckling due...
Complex chiral particles Synthetic colloids are usually smooth, but nature can produce micrometer-scale with intricate structure and shape, such as the coccoliths produced by algae. Jiang et al. controlled self-assembly of gold–cysteine nanoplatelets into a variety chiral, hierarchically organized colloidal changing fraction cysteine nucleation temperature. Organic cations created electrostatic repulsions that favored edge assembly nanoplatelets, which in turn could create surfaces bearing...
Zinc oxide nanoparticles cause marked up-regulation of pyrimidine biosynthesis and sugar metabolism but consistent down-regulation amino acid synthesis in MRSA, suggesting a previously unrecognized mechanism action.
Interconnectivity of components in three-dimensional networks (3DNs) is essential for stress transfer hydrogels, aerogels, and composites. Entanglement nanoscale the network relies on weak short-range intermolecular interactions. The intrinsic stiffness rod-like geometry limit cohesive energy physical crosslinks 3DN materials. Nature realizes networked gels differently using with extensive branching. Branched aramid nanofibers (BANFs) mimicking polymeric biological were synthesized to...
This paper describes a simple microfluidic sorting system that can perform size profiling and continuous mass-dependent separation of particles through combined use gravity (1 g) hydrodynamic flows capable rapidly amplifying sedimentation-based between particles. Operation the device relies on two transport processes: (i) initial focusing in microchannel oriented parallel to (ii) subsequent sample where positional difference with different mass generated by sedimentation is further amplified...
6-Mercaptopurine and its riboside derivatives are some of the most widely utilized anti-leukemic anti-inflammatory drugs. Their short biological half-life severe side effects limit their use. A new delivery method for these drugs based on 4−5 nm gold nanoparticles can potentially resolve issues. We have found substantial enhancement antiproliferative effect against K-562 leukemia cells Au bearing 6-mercaptopurine-9-β-d-ribofuranoside compared to same drug in typically administered free form....
A systematic approach has been followed in the development of a high-efficiency hybrid photovoltaic device that combination poly(3-hexylthiophene) (P3HT), [6,6]-phenyl C61-butyric acid methyl ester (PCBM), and silver nanowires (Ag NWs) active layer using bulk heterojunction concept. The is modified by utilizing binary solvent system for blending. In addition, evaporation process after spin-coating changed an Ag NWs incorporated to improve performance device. Hybrid devices were fabricated...
The intra- and extracellular positioning of plasmonic nanoparticles (NPs) can dramatically alter their curative/diagnostic abilities medical outcomes. However, the inability common spectroscopic identifiers to register events transmembrane transport denies intracellular vs. localization even for cell cultures. Here we show that chiroptical activity DNA-bridged NP dimers allows one follow process internalization particles by mammalian cells distinguish extra- vs intra-cellular localizations...
Concave nanoparticles (NPs) with complex angled and non‐Platonic geometries have unique optical, magnetic, catalytic, biological properties originating from the singularities of electrical field in apexes craters. Preparation such particles a uniform size/shape core–shell morphology represents significant challenge, largely because poor knowledge their formation mechanism. Here, this challenge is addressed study mechanism presented for case spiky morphologies that led us to conclusion NPs...
Biological compounds often provide clues to advance material designs. Replicating their molecular structure and functional motifs in artificial materials offers a blueprint for unprecedented functionalities. Here, we report flexible biomimetic thermal sensing (BTS) polymer that is designed emulate the ion transport dynamics of plant cell wall component, pectin. Using simple yet versatile synthetic procedure, engineer physicochemical properties by inserting elastic fragments block copolymer...
Chiral nanostructures exhibit strong coupling to the spin angular momentum of incident photons. The integration metal with semiconductor nanoparticles (NPs) form hybrid plasmon–exciton nanoscale assemblies can potentially lead plasmon-induced optical activity and unusual chiroptical properties states. Here we investigate such effects in supraparticles (SPs) spontaneously formed from gold nanorods (NRs) chiral CdTe NPs. geometry this new type self-limited superstructures depends on molar...
view Abstract Citations (79) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Lifetime of Solar Granules. Bahng, J. ; Schwarzschild, M. A time sequence high-definition photographs the solar granulation was obtained on Stratoscope flight August 17,1959 The correlation function in for photospheric intensity variations has been determined from these photographs. found to be well represented by a simple exponential decay with constant 6 27 minutes....
This work is the first demonstration of electrical modulation surface energy to reversibly switch dynamic high-speed gas-liquid two-phase microfluidic flow patterns. Manipulation systems with continuous flows complex and interesting due multiple types forces that need be considered. Here, distinct stable patterns are formed through a multipronged approach: both tension generated by chemistry as well viscous inertial produced fluid employed. The novel fluidic actuation mechanism provides...
Hedgehog particles (HPs) replicating the spiky geometry of pollen grains revealed surprisingly high dispersion stability regardless whether their hydrophobicity/hydrophilicity matches that media or not. This property designated as omnidispersibility is attributed to drastic reduction van der Waals interactions between coated with stiff nanoscale spikes compared same dimensions smooth surfaces. One may hypothesize but it remains unknown, however, HPs modified polymers nanoparticles (NPs)...
Understanding transport of carbon nanotubes (CNTs) and other nanocarriers within tissues is essential for biomedical imaging drug delivery using these carriers. Compared to traditional cell cultures in animal studies, three-dimensional tissue replicas approach the complexity actual organs enable high temporal spatial resolution carrier permeation. We investigated diffusional CNTs highly uniform spheroids hepatocellular carcinoma found that apparent diffusion coefficients are anomalously...
Supraparticles are micelle-like self-limited assemblies from inorganic nanoparticles (NPs), whose size and morphology determined by the equilibrium between short-range attraction long-range repulsion forces. They can be spontaneously assembled a variety of nanoscale components that are, in majority cases, same NPs. Hybrid supraparticles made biological possible but hardly known. We report here self-assembly hybrid bioinorganic supraparticles, prepared iron disulfide, cadmium telluride, zinc...
The comparative evaluation of different 3D matrices—Matrigel, Puramatrix, and inverted colloidal crystal (ICC) scaffolds—provides a perspective for studying the pathology potential cures many blood bone marrow diseases, further proves significance cultures with direct cell–cell contacts in vitro mimicry human stem cell niche.
Supraparticles are coordinated assemblies of discrete nanoscale building blocks into complex and hierarchical colloidal superstructures. Holistic optical responses in such not observed an individual block or their bulk counterparts. Furthermore, subwavelength dimensions the unit enable engraving metamaterials within supraparticle, which thus far has been beyond current pool engineering. This can lead to effective features a platform with ability tune electromagnetic these particles. Here, we...