Perfect Orientation Ordered in-Situ One-Dimensional Self-Assembly of Mn-Doped PbSe Nanocrystals

2004 ◽  
Vol 126 (45) ◽  
pp. 14816-14821 ◽  
Author(s):  
Weigang Lu ◽  
Puxian Gao ◽  
Wen Bin Jian ◽  
Zhong Lin Wang ◽  
Jiye Fang
Keyword(s):  
Self Assembly ◽  
One Dimensional ◽  
Mn Doped

scholarly journals Hybrid One-Dimensional Nanostructures: One-Pot Preparation of Nanoparticle Chains via Directed Self-Assembly of in Situ Synthesized Discrete Au Nanoparticles

Langmuir ◽  
2012 ◽  
Vol 28 (14) ◽  
pp. 5947-5955 ◽  
Author(s):  
Marie V. Walter ◽  
Nicolas Cheval ◽  
Olimpia Liszka ◽  
Michael Malkoch ◽  
Amir Fahmi
Keyword(s):  
Self Assembly ◽  
Au Nanoparticles ◽  
One Pot ◽  
One Dimensional ◽  
Nanoparticle Chains ◽  
One Dimensional Nanostructures

Hierarchic self-assembling of silver nanoparticles in solution

2012 ◽  
Vol 1 (1) ◽  
pp. 57-78 ◽  
Author(s):  
Lorenza Suber ◽  
Gaetano Campi
Keyword(s):  
Silver Nanoparticles ◽  
Self Assembly ◽  
Time Resolved ◽  
One Dimensional ◽  
X Ray ◽  
Self Assembling ◽  
X Ray Scattering ◽  
Complex Forms ◽  
2D And 3D

AbstractFacile chemical synthesis and understanding of the formation mechanism of silver nanoparticles, ordered on the microscale on one-dimensional (1D), 2D or in 3D structures of complex forms is challenging for advanced applications, in electronics, optoelectronics, and medicine, to mention a few. Significant results obtained in the comprehension of assembling mechanisms in solutions of silver nanoparticles in 1D, 2D, and 3D organic-inorganic mesostructures are surveyed together with details on their preparation and characterization. Emphasis will be placed on very recent results obtained in our laboratories on self-assembly of silver nanoparticles in 1D microstructures and hierarchic ordering in 3D flower-like mesostructures monitored and studied by in situ and time-resolved small angle X-ray scattering (SAXS) measurements.

scholarly journals Investigation of Self-Assembly and Charge-Transport Property of One-dimensional PDI8-CN2 Nanowires by Solvent-Vapor Annealing

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 438 ◽  
Author(s):  
Haixiao Xu ◽  
Jianqun Jin ◽  
Jing Zhang ◽  
Peng Sheng ◽  
Yu Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
High Performance ◽  
Solvent Vapor ◽  
One Dimensional ◽  
Force Microscopy ◽  
Atomic Force ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing ◽  
Microscopy Characterization

One-dimensional (1D) nanowires have attracted great interest, while air-stable n-type 1D nanowires still remain scarce. Herein, we present solvent-vapor annealing (SVA) made nanowires based on perylene tetracarboxylic diimide (PDI) derivative. It was found that the spin-coated thin films reorganized into nanowires distributed all over the substrate, as a result of the following solvent-vapor annealing effect. Cooperating with the atomic force microscopy and fluorescence microscopy characterization, the PDI8-CN2 molecules were supposed to conduct a long-range and entire transport to form the 1D nanowires through the SVA process, which may guarantee its potential morphology tailoring ability. In addition, the nanowire-based transistors displayed air stable electron mobility reaching to 0.15 cm2 V−1 s−1, attributing to effective in situ reassembly. Owing to the broader application of organic small-molecule nanowires, this work opens up an attractive approach for exploring new high-performance micro- and nanoelectronics.

In situ etching-induced self-assembly of metal cluster decorated one-dimensional semiconductors for solar-powered water splitting: unraveling cooperative synergy by photoelectrochemical investigations

Nanoscale ◽  
2017 ◽  
Vol 9 (43) ◽  
pp. 17118-17132 ◽  
Author(s):  
Fang-Xing Xiao ◽  
Bin Liu
Keyword(s):  
Water Splitting ◽  
Self Assembly ◽  
Gold Cluster ◽  
Metal Cluster ◽  
Nanowire Array ◽  
Zno Nanowire ◽  
One Dimensional ◽  
Assembly Strategy ◽  
Solar Powered

A facile, green, simple yet efficient in situ etching-induced self-assembly strategy has been developed to construct gold cluster-enwrapped ZnO nanowire array heterostructures for solar-powered water splitting.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

Probing the Dynamic Self-Assembly Behaviour of Photoswitchable Wormlike Micelles in Real Time

2018 ◽  
Author(s):  
Elaine A. Kelly ◽  
Judith E. Houston ◽  
Rachel Evans
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Self Assembly ◽  
Uv Light ◽  
Wormlike Micelles ◽  
Tetraethylene Glycol ◽  
Light Illumination ◽  
First Time ◽  
Dependent Processes

Understanding the dynamic self-assembly behaviour of azobenzene photosurfactants (AzoPS) is crucial to advance their use in controlled release applications such as<i></i>drug delivery and micellar catalysis. Currently, their behaviour in the equilibrium <i>cis-</i>and <i>trans</i>-photostationary states is more widely understood than during the photoisomerisation process itself. Here, we investigate the time-dependent self-assembly of the different photoisomers of a model neutral AzoPS, <a>tetraethylene glycol mono(4′,4-octyloxy,octyl-azobenzene) </a>(C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>) using small-angle neutron scattering (SANS). We show that the incorporation of <i>in-situ</i>UV-Vis absorption spectroscopy with SANS allows the scattering profile, and hence micelle shape, to be correlated with the extent of photoisomerisation in real-time. It was observed that C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>could switch between wormlike micelles (<i>trans</i>native state) and fractal aggregates (under UV light), with changes in the self-assembled structure arising concurrently with changes in the absorption spectrum. Wormlike micelles could be recovered within 60 seconds of blue light illumination. To the best of our knowledge, this is the first time the degree of AzoPS photoisomerisation has been tracked <i>in</i><i>-situ</i>through combined UV-Vis absorption spectroscopy-SANS measurements. This technique could be widely used to gain mechanistic and kinetic insights into light-dependent processes that are reliant on self-assembly.

In situ Time-Resolved Small-Angle X-ray Scattering Reveals the Formation Kinetics of Polyelectrolyte Complex Micelles

2019 ◽  
Author(s):  
Hao Wu ◽  
Jeffrey Ting ◽  
Siqi Meng ◽  
Matthew Tirrell
Keyword(s):  
Small Angle ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Polyelectrolyte Complex ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering

We have directly observed the <i>in situ</i> self-assembly kinetics of polyelectrolyte complex (PEC) micelles by synchrotron time-resolved small-angle X-ray scattering, equipped with a stopped-flow device that provides millisecond temporal resolution. This work has elucidated one general kinetic pathway for the process of PEC micelle formation, which provides useful physical insights for increasing our fundamental understanding of complexation and self-assembly dynamics driven by electrostatic interactions that occur on ultrafast timescales.

scholarly journals Development of In Situ Self-Assembly Nanoparticles to Encapsulate Lopinavir and Ritonavir for Long-Acting Subcutaneous Injection

Pharmaceutics ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 904
Author(s):  
Irin Tanaudommongkon ◽  
Asama Tanaudommongkon ◽  
Xiaowei Dong
Keyword(s):  
Sustained Release ◽  
Trough Concentration ◽  
Self Assembly ◽  
Subcutaneous Injection ◽  
Drug Loading ◽  
Entrapment Efficiency ◽  
Long Acting

Most antiretroviral medications for human immunodeficiency virus treatment and prevention require high levels of patient adherence, such that medications need to be administered daily without missing doses. Here, a long-acting subcutaneous injection of lopinavir (LPV) in combination with ritonavir (RTV) using in situ self-assembly nanoparticles (ISNPs) was developed to potentially overcome adherence barriers. The ISNP approach can improve the pharmacokinetic profiles of the drugs. The ISNPs were characterized in terms of particle size, drug entrapment efficiency, drug loading, in vitro release study, and in vivo pharmacokinetic study. LPV/RTV ISNPs were 167.8 nm in size, with a polydispersity index of less than 0.35. The entrapment efficiency was over 98% for both LPV and RTV, with drug loadings of 25% LPV and 6.3% RTV. A slow release rate of LPV was observed at about 20% on day 5, followed by a sustained release beyond 14 days. RTV released faster than LPV in the first 5 days and slower than LPV thereafter. LPV trough concentration remained above 160 ng/mL and RTV trough concentration was above 50 ng/mL after 6 days with one subcutaneous injection. Overall, the ISNP-based LPV/RTV injection showed sustained release profiles in both in vitro and in vivo studies.

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