Photoionization of Nanosized Aerosol Gold Agglomerates and Their Deposition To Form Nanoscale Islands on Substrates

Byeon, Jeong Hoon; Roberts, Jeffrey T.

doi:10.1021/la501410z

Cited by 7 publications

(6 citation statements)

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“…Au photoionization in a flowing drop (FD) by irradiation with a photon energy (6.2 eV) higher than the Au work function (5.1 eV) shifted the Au surface into an active state for electrostatic conjugation with bioactive molecules in an FD. The electron loss from the primary Au particles in AGs renders them positively charged and induces rearrangements of the gap spaces in primary particles via repulsive forces between the positively charged surfaces . Suspended bioactive molecules (containing negatively charged functional groups) near the primary particles were incorporated into the gap spaces and electrostatically conjugated with the Au surfaces ( Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…The electron loss from the primary Au particles in AGs renders them positively charged and induces rearrangements of the gap spaces in primary particles via repulsive forces between the positively charged surfaces. [19] Suspended bioactive molecules (containing negatively charged functional groups) near the primary particles were incorporated into the gap spaces [20] and electrostatically conjugated with the Au surfaces (Figure 1). Briefly, Au AGs were produced via spark ablation between two pure Au rods, and a Triton X-100 (T) and doxorubicin (D) mixture was chosen as the bioactive molecule to test the feasibility of the FD reaction as an on-demand manufacturing platform.…”

Section: Introductionmentioning

confidence: 99%

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Photoinduced Rapid Transformation from Au Nanoagglomerates to Drug‐Conjugated Au Nanovesicles

2017

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Gold (Au) agglomerates (AGs) are reassembled using Triton X‐100 (T) and doxorubicin (D) dissolved in ethanol under 185 nm photoirradiation to form TAuD nanovesicles (NVs) under ambient gas flow conditions. The positively charged Au particles are then electrostatically conjugated with the anionic chains of TD components via a flowing drop (FD) reaction. Photoirradiation of the droplets in a tubular reactor continues the photophysicochemical reactions, resulting in the reassembly of Au AGs and TD into TAuD NVs. The fabricated NVs are electrostatically collected onto a polished aluminum rod in a single‐pass configuration. The dispersion of NVs is employed for bioassays to confirm uptake by cells and accumulation in tumors. The chemo‐photothermal activity is determined both in vitro and in vivo. Different combinations of components are also used to fabricate NVs using the FD reaction, and these NVs are suitable for gene delivery as well. This newly designed gaseous single‐pass process results in the reassembly of Au AGs for incorporation with TD without the need of batch wet chemical reactions, modifications, separations, or purifications. Thus, this process offers an efficient platform for preparing biofunctional Au nanostructures that requires neither complex physicochemical steps nor special storage techniques.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoinduced Rapid Transformation from Au Nanoagglomerates to Drug‐Conjugated Au Nanovesicles

2017

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“…High-magnification images show localized lattice structures with d-spacings of 0.34 nm and 0.22 nm, respectively, corresponding to the (021) and (002) planes of BP, indicating that the BP NSs retained a puckered hexagonal structure. These images also revealed darker spots (1-5 nm, N = 200) on a BP NS, associated with the lattice fringes of Au (d-spacing = 0.23 nm) and Sn (dspacing = 0.29 nm), which can be ascribed to the (111) plane of face-centered-cubic Au and the (200) plane of tetragonal Sn, respectively 22,23 . The XPS spectra (Fig.…”

Section: Resultsmentioning

confidence: 95%

A batch-by-batch free route for the continuous production of black phosphorus nanosheets for targeted combination cancer therapy

Poudel

Hwang

et al. 2018

NPG Asia Mater

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Although 2D materials such as graphenes, chalcogenides, and black phosphorus (BP) have been intensively studied for a wide range of future technological applications, the multiple harsh reactions and post-treatments required to produce exfoliated nanosheets (NSs) represent challenging barriers to their realization. In the present study, a batchby-batch free route to produce BP NSs was demonstrated, and the NSs were employed as base materials for the chemo-phototherapy of breast cancer. Specifically, a single-pass catalytic conversion of an all-in-one precursor (red P, Au-Sn, and iodine) in a heated tubular reactor (at a 650°C wall temperature for 15.5 s) continuously produced crumpled BP NSs, and the NS-laden gas stream was passed through an activated carbon-packed tube to remove the reacted gases. Subsequently, doxorubicin (D), poly-L-lysine (L), and hyaluronic acid (H) were incorporated without further purification of these NSs to form BP-DLH, which was then employed in both in vitro and in vivo chemophototherapies. The biocompatibility and near-infrared-induced photothermal activity of BP NSs facilitate targeted delivery to CD44-overexpressing breast cancer cells to assist in the therapeutic efficacy of D.

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“…To the best of our knowledge this island type dispersion for nickel nanoparticles has not been reported up to date in the literature. Although, Suzuki et al, [32] and Byeon et al, [33] have used the term metallic islands or nanoscaled islands for silver and gold nanoparticles deposited on a silicon substrate, the form of the nickel island deposited in the polyethylene matrix is completely different from those reported by these authors. Comparing the samples with the lower amount of metallic nanoparticles (Ni-Pe4 and Ni-Ch4 (M:AA= 0.125:1), it is possible to observe some differences between the composites.…”

Section: Resultsmentioning

confidence: 95%

Nickel nanocomposites: magnetic and catalytic properties

et al. 2015

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Artículo de publicación ISISin acceso a texto completoIn this study, we are reporting the synthesis and characterization of nanocomposites obtained from the direct reduction of nickel(II) salts on matrices of polyethylene (Pe) and chitosan (Ch) in the presence of serine under solvothermal conditions. Using different molar ratios between the metal salt (M) and the amino acid (AA), eight nanocomposites were prepared, Ni-Pe1; Ni-Pe2; Ni-Pe3; Ni-Pe4 and Ni-Ch1; Ni-Ch2; Ni-Ch3; Ni-Ch4 (M : AA = 1 : 1, (1); 0.5 : 1, (2); 0.25 : 1, (3) and 0.125 : 1, (4)). The synthesized composites were characterized by X-ray powder diffraction techniques; in all the cases, the peaks associated to the matrix (Pe or Ch) and three peaks at 2 theta values of 44.5 degrees, 51.9 degrees, 76.4 degrees were identified, which correspond to the Miller indices (111), (200), (220). These indices are characteristic of a face centred cubic Ni- 0 phase. The SEM images of the composites show that the use of an organic matrix changes the size and distribution of the metallic particles because in all the cases a homogenous dispersion of Ni-0-NPs on the matrix surfaces is observed. While the spherical shape observed for isolated Ni-0-NPs is retained on the matrices, the size of the metallic particles is smaller than 100 nm with less size variability, as compared with the isolated Ni-0-NPs. All the composites have a weak ferromagnetic behaviour with similar hysteresis loops, presenting H-c values ranging from 120 to 226 Oe and reaching saturation at approximately 3 kOe. Preliminary catalytic properties for hydrogen transfer reaction were also investigated, showing that the composites exhibit an important activity in the transformation of acetophenone to 1- phenylethanol.Financiamiento Basal FB0807 Laboratorio de Caracterizacao Magnetica LMCMM-UFSC Departamento de Fisica and Centro de Microscopia Electronica CME-UFSC Universidade Federal do Santa Catarina CONICYT 21110032 FONDEQUIP/PPMS/EQM130086 Proyecto Basal CEDENN

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Photoionization of Nanosized Aerosol Gold Agglomerates and Their Deposition To Form Nanoscale Islands on Substrates

Cited by 7 publications

References 45 publications

Photoinduced Rapid Transformation from Au Nanoagglomerates to Drug‐Conjugated Au Nanovesicles

Photoinduced Rapid Transformation from Au Nanoagglomerates to Drug‐Conjugated Au Nanovesicles

A batch-by-batch free route for the continuous production of black phosphorus nanosheets for targeted combination cancer therapy

Nickel nanocomposites: magnetic and catalytic properties

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