Synthesis of nano-bowls with a Janus template

Mo, Alexander H.; Landon, Preston B.; Emerson, Chris D.; Zhang, Chen; Anzenberg, Paula; Akkiraju, Siddhartha; Lal, Ratnesh

doi:10.1039/c4nr05153j

Cited by 22 publications

(30 citation statements)

References 33 publications

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“…8,11,12,25−29 Recently, we used a sol−gel method to form a composite particle consisting of a silica shell partially encapsulating a carboxylated polystyrene (cPS) core. 30 This morphology has also been demonstrated in Janus particles with gold 6 and iron oxide 7 cores. The common factor in all of these Janus particles is the presence of the carboxylate surface.…”

Section: ■ Introductionmentioning

confidence: 83%

Asymmetric Colloidal Janus Particle Formation Is Core-Size-Dependent

Landon

Printz

et al. 2015

Langmuir

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Colloidal particles with asymmetric surface chemistry (Janus particles) have unique bifunctional properties. The size of these particles is an important determinant for their applications in diverse fields from drug delivery to chemical catalysis. The size of Janus particles, with a core surface coated with carboxylate and a partially encapsulating silica shell, depends upon several factors, including the core size and the concentration of carboxylate coating. The role of the carboxylate coating on the Janus particle size is well-understood; however, the role of the core size is not well defined. The role of the carboxylated polystyrene (cPS) core size on the cPS-silica Janus particle morphology (its size and shape) was examined by testing two different silica sizes and five different cPS core sizes. Results from electron microscopy (EM) and dynamic light scattering (DLS) analysis indicate that the composite cPS-silica particle acquires two distinct shapes: (i) when the size of the cPS core is much smaller than the non-cPS silica (b-SiO2) sphere, partially encapsulated Janus particles are formed, and (ii) when the cPS core is larger than or equal to the b-SiO2 sphere, a raspberry-like structure rather than a Janus particle is formed. The cPS-silica Janus particles of ∼100-500 nm size were obtained when the size of the cPS core was much smaller than the non-cPS silica (b-SiO2) sphere. These scalable nanoscale Janus particles will have wide application in a multifunctional delivery platform and catalysis.

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Section: ■ Introductionmentioning

confidence: 83%

Asymmetric Colloidal Janus Particle Formation Is Core-Size-Dependent

Landon

Printz

et al. 2015

Langmuir

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“…Nanobowls are a class of novel asymmetric structures. , The bowl-shaped architecture with hollow interiors and openings on their surface possess a large surface area, which render their favorable applications in catalysis, supercapacitors, and drug delivery . A number of synthetic strategies toward bowl-shaped structures have been developed, such as the self-assembly from amphiphilic block copolymers, − aggregation from molecular motor induced by solvent mixing, and synergy supramolecular forces between the side chains of polymers .…”

Section: Introductionmentioning

confidence: 99%

Water-Soluble Fluorescent Nanobowls Constructed by Multiple Supramolecular Assembly

Huang

Hang

et al. 2020

Macromolecules

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Ordering and orientation of conjugated polymers (CPs) into well-defined supramolecular structures render the exploration of new properties of the assemblies. However, the fabrication of an asymmetric structure such as a bowl-shaped nanostructure by self-assembly from rigid CPs is still a major challenge because of their extremely rigid molecular backbones. Here, amphiphilic diblock copolymer [polystyrene-b-poly(acrylic acid), PS-b-PAA] and small molecule (phenylboronic acid, PBA) were employed as additives into the CPs to guide the formation of fully water-soluble bowl-shaped vesicles driven by the synergy of π–π stacking interactions, hydrophobic interactions, and hydrogen-bonding interactions between the three components. The size of the openings and interior holes of the nanobowls can be precisely controlled by varying the amount of PBA. This assembly strategy may open an avenue for the construction of a series of CP-based bowl-shaped vesicles. Furthermore, the water-soluble fluorescent nanobowls may act as a useful platform for drug delivery and chemical sensing applications.

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“…The coatings are separated spatially in well-defined manners, allowing both components to interact with the surrounding environment. For example, Lal and co-workers fabricated a dumbbell-like structure composed of polystyrene and silica and used it as a template for preparing silica nanobowls . Minko and co-workers applied biodegradable dumbbell-structured nanoparticles for local pulmonary delivery of hydrophilic and hydrophobic molecules to the lungs .…”

Section: Introductionmentioning

confidence: 99%

“…For example, Lal and co-workers fabricated a dumbbell-like structure composed of polystyrene and silica and used it as a template for preparing silica nanobowls. 6 Minko and co-workers applied biodegradable dumbbell-structured nanoparticles for local pulmonary delivery of hydrophilic and hydrophobic molecules to the lungs. 7 Glaser and co-workers demonstrated that dumbbellstructured nanoparticles composed of gold and iron oxide can reduce the interfacial tension at the oil/water interface significantly.…”

Section: Introductionmentioning

confidence: 99%

Dumbbell-Like Silica Coated Gold Nanorods and Their Plasmonic Properties

et al. 2019

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Silica coated gold nanorods (GNRs@SiO 2 ) with dumbbell-like morphology allowing dual functionalization in an individual nanostructure have attracted great attention for applications such as sensing and biological imaging. We report a detailed study on the feasibility of controlling the morphology of silica coating on GNRs. The morphology of the silica shell can be either cylindrical or dumbbell shaped. With constant GNR concentration, the ratio of hexadecyltrimethylammonium bromide (CTAB) and tetraethylorthosilicate (TEOS) concentrations is the key to determine the amount of available TEOS for silica deposition on the GNR since the TEOS will diffuse toward the surface of GNRs. The effect of morphologies on surface-enhanced Raman scattering (SERS) performance was also investigated, and we found that the dumbbell morphology of silica coated gold nanorods has the most significant SERS enhancement. Our study is significant in terms of the capability to control the dumbbell morphology of silica coated gold nanorods, which can eventually broaden the application of these plasmonic nanomaterials.

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Synthesis of nano-bowls with a Janus template

Cited by 22 publications

References 33 publications

Asymmetric Colloidal Janus Particle Formation Is Core-Size-Dependent

Asymmetric Colloidal Janus Particle Formation Is Core-Size-Dependent

Water-Soluble Fluorescent Nanobowls Constructed by Multiple Supramolecular Assembly

Dumbbell-Like Silica Coated Gold Nanorods and Their Plasmonic Properties

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