scholarly journals Self-Assembled Hierarchical CuxO@C18H36O2 Nanoflakes for Superior Fenton-like Catalysis over a Wide Range of pH

ACS Omega ◽  
2021 ◽  
Author(s):  
Ratul Rehman ◽  
Sudip Kumar Lahiri ◽  
Ashraful Islam ◽  
Peng Wei ◽  
Yue Xu
Keyword(s):  
Wide Range ◽  
Self Assembled

scholarly journals In Vitro Cellular Uptake Studies of Self-Assembled Fluorinated Nanoparticles Labelled with Antibodies

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1906
Author(s):  
Mona Atabakhshi-Kashi ◽  
Mónica Carril ◽  
Hossein Mahdavi ◽  
Wolfgang J. Parak ◽  
Carolina Carrillo-Carrion ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Cellular Uptake ◽  
Hydrophobic Interactions ◽  
Intrinsic Properties ◽  
Wide Range ◽  
Self Assembled ◽  
Uptake Studies ◽  
Targeting Ability ◽  
Fluorinated Nanoparticles

Nanoparticles (NPs) functionalized with antibodies (Abs) on their surface are used in a wide range of bioapplications. Whereas the attachment of antibodies to single NPs to trigger the internalization in cells via receptor-mediated endocytosis has been widely studied, the conjugation of antibodies to larger NP assemblies has been much less explored. Taking into account that NP assemblies may be advantageous for some specific applications, the possibility of incorporating targeting ligands is quite important. Herein, we performed the effective conjugation of antibodies onto a fluorescent NP assembly, which consisted of fluorinated Quantum Dots (QD) self-assembled through fluorine–fluorine hydrophobic interactions. Cellular uptake studies by confocal microscopy and flow cytometry revealed that the NP assembly underwent the same uptake procedure as individual NPs; that is, the antibodies retained their targeting ability once attached to the nanoassembly, and the NP assembly preserved its intrinsic properties (i.e., fluorescence in the case of QD nanoassembly).

Co-assembly of helical β3-peptides: a self-assembled analogue of a statistical copolymer

2017 ◽  
Vol 89 (12) ◽  
pp. 1809-1816 ◽  
Author(s):  
Claire Buchanan ◽  
Christopher J. Garvey ◽  
Patrick Perlmutter ◽  
Adam Mechler
Keyword(s):  
Amino Acids ◽  
Physical Properties ◽  
Self Assembly ◽  
Unnatural Amino Acids ◽  
The Self ◽  
Microscopy Imaging ◽  
Wide Range ◽  
Self Assembled ◽  
Unnatural Peptides ◽  
Natural Amino Acids

AbstractUnnatural peptide self-assembly offers the means to design hierarchical nanostructures of controlled geometries, chemical function and physical properties. N-acyl β3 peptides, where all residues are unnatural amino acids, are able to form helical fibrous structures by a head-to-tail assembly of helical monomers, extending the helix via a three point supramolecular hydrogen bonding motif. These helical nanorods were shown to be stable under a wide range of physical conditions, offering a self-assembled analogue of polymeric fibres. Hitherto the self-assembly has only been demonstrated between identical monomers; however the self-assembly motif is sequence-independent, offering the possibility of hetero-assembly of different peptide monomers. Here we present a proof of principle study of head-to-tail co-assembly of two different helical unnatural peptides Ac-β3[WELWEL] and Ac-β3[LIA], where the letters denote the β3 analogues of natural amino acids. By atomic force microscopy imaging it was demonstrated that the homo-assembly and co-assembly of these peptides yield characteristically different structures. Synchrotron small angle X-ray scattering experiments have confirmed the presence of the fibres in the solution and the averaged diameters from modelled data correlate well to the results of AFM imaging. Hence, there is evidence of co-assembly of the fibrous superstructures; given that different monomers may be used to introduce variations into chemical and physical properties, the results demonstrate a self-assembled analogue of a statistical co-polymer that can be used in designing complex functional nanomaterials.

1.55 Micron Emission from InAs/InP Self-Assembled Quantum Dots

1999 ◽  
Vol 571 ◽  
Author(s):  
Ray Murray ◽  
Caroline Bryan ◽  
Chris Button ◽  
D. Spikes ◽  
G. Hill
Keyword(s):  
Quantum Dots ◽  
Quantum Well ◽  
Room Temperature ◽  
Chemical Vapour ◽  
Organic Chemical ◽  
Wide Range ◽  
Metal Organic ◽  
Self Assembled ◽  
Multi Quantum Well

ABSTRACTSelf-assembled InAs/InP and InAs/InGaAsP quantum dots (QDs) grown by metal-organic chemical vapour epitaxy (MOVPE) exhibit emission at 1.5–1.6 μm at room temperature. P-I-N diodes incorporating a single InAs/InGaAsP QD layer exhibit strong electroluminescence over a wide range of input currents and emit significantly more light per layer than a InGaAs/InGaAsP multi-quantum well device.

scholarly journals Peptide Nanomaterials for Drug Delivery Applications

2020 ◽  
Vol 21 (4) ◽  
pp. 401-412 ◽  
Author(s):  
Sreekanth Pentlavalli ◽  
Sophie Coulter ◽  
Garry Laverty
Keyword(s):  
Drug Delivery ◽  
Self Assembly ◽  
Diverse Range ◽  
Drug Molecules ◽  
Sustained Drug Delivery ◽  
Self Assembling ◽  
Wide Range ◽  
Methods Of Synthesis ◽  
Self Assembled

Self-assembled peptides have been shown to form well-defined nanostructures which display outstanding characteristics for many biomedical applications and especially in controlled drug delivery. Such biomaterials are becoming increasingly popular due to routine, standardized methods of synthesis, high biocompatibility, biodegradability and ease of upscale. Moreover, one can modify the structure at the molecular level to form various nanostructures with a wide range of applications in the field of medicine. Through environmental modifications such as changes in pH and ionic strength and the introduction of enzymes or light, it is possible to trigger self-assembly and design a host of different self-assembled nanostructures. The resulting nanostructures include nanotubes, nanofibers, hydrogels and nanovesicles which all display a diverse range of physico-chemical and mechanical properties. Depending on their design, peptide self-assembling nanostructures can be manufactured with improved biocompatibility and in vivo stability and the ability to encapsulate drugs with the capacity for sustained drug delivery. These molecules can act as carriers for drug molecules to ferry cargo intracellularly and respond to stimuli changes for both hydrophilic and hydrophobic drugs. This review explores the types of self-assembling nanostructures, the effects of external stimuli on and the mechanisms behind the assembly process, and applications for such technology in drug delivery.

scholarly journals Assembling Magnetic Nanoparticles on Nanomechanical Resonators for Torque Magnetometry

2020 ◽  
Vol 21 (3) ◽  
pp. 984
Author(s):  
Tayyaba Firdous ◽  
David K. Potter
Keyword(s):  
Single Layer ◽  
Silicon On Insulator ◽  
Magnetic Actuation ◽  
Nanoparticle Arrays ◽  
Magnetic Torque ◽  
Nanomechanical Resonators ◽  
Torque Magnetometry ◽  
Wide Range ◽  
Geometrical Shapes ◽  
Self Assembled

We report a highly compliant process for patterning nanoparticle arrays on micro- and nanomechanical devices. The distinctive step involves the single layer self-assembled nanoparticles on top of released nanomechanical devices. We demonstrate the process by fabricating sizable arrays of nanomechanical devices on silicon-on-insulator substrates, acting as nanomechanical torque magnetometers. Later, the nanoparticles were self-assembled in geometrical shapes on top of the devices by a unique combination of top-down and bottom-up methods. The self-assembled array of nanoparticles successfully showed a magnetic torque signal by magnetic actuation of the magnetometer. This patterning process can be generalized for any shape and for a wide range of nanoparticles on the nanomechanical resonators.

In Situ Second Harmonic Generation Measurements of the Growth of Nonlinear Optical Ionically Self-Assembled Monolayers

2000 ◽  
Vol 660 ◽  
Author(s):  
C. Brands ◽  
P.J. Neyman ◽  
M.T. Guzy ◽  
S. Shah ◽  
K.E. Van Cott ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Self Assembled Monolayers ◽  
Optical Polymer ◽  
Wide Range ◽  
Assembled Monolayers ◽  
Self Assembled

ABSTRACTIonically self-assembled monolayers (ISAMs) have recently been shown to spontaneously exhibit a polar ordering that gives rise to a substantial second order nonlinear optical (NLO) response. Here, the deposition of ISAMs has been studied in situ via second harmonic generation (SHG). We show that the adsorption and ordering of a noncentrosymmetric nonlinear optical polymer is constant over a wide range of concentrations. Upon immersion in the NLO-active polyelectrolyte solution, the SHG rises sharply over the first minute. Immersion in the NLO-inactive partner polyelectrolyte leads to a reduction in the SHG signal. Furthermore, when the film is removed from the NLO-active solution and allowed to dry, the SHG increases rapidly as the water evaporates. These studies provide greater understanding of the processes by which noncentrosymmetric order is formed in ISAM films and allows design of improved self- assembled nonlinear optical materials.

scholarly journals A priori calculations of the free energy of formation from solution of polymorphic self-assembled monolayers

2015 ◽  
Vol 112 (45) ◽  
pp. E6101-E6110 ◽  
Author(s):  
Jeffrey R. Reimers ◽  
Dwi Panduwinata ◽  
Johan Visser ◽  
Yiing Chin ◽  
Chunguang Tang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Density Functional ◽  
A Priori ◽  
Pyrolytic Graphite ◽  
Density Functional Theory Calculations ◽  
Self Assembled Monolayer ◽  
Atomic Structures ◽  
Wide Range ◽  
Entropy Effects ◽  
Self Assembled

Modern quantum chemical electronic structure methods typically applied to localized chemical bonding are developed to predict atomic structures and free energies for meso-tetraalkylporphyrin self-assembled monolayer (SAM) polymorph formation from organic solution on highly ordered pyrolytic graphite surfaces. Large polymorph-dependent dispersion-induced substrate−molecule interactions (e.g., −100 kcal mol−1 to −150 kcal mol−1 for tetratrisdecylporphyrin) are found to drive SAM formation, opposed nearly completely by large polymorph-dependent dispersion-induced solvent interactions (70–110 kcal mol−1) and entropy effects (25–40 kcal mol−1 at 298 K) favoring dissolution. Dielectric continuum models of the solvent are used, facilitating consideration of many possible SAM polymorphs, along with quantum mechanical/molecular mechanical and dispersion-corrected density functional theory calculations. These predict and interpret newly measured and existing high-resolution scanning tunnelling microscopy images of SAM structure, rationalizing polymorph formation conditions. A wide range of molecular condensed matter properties at room temperature now appear suitable for prediction and analysis using electronic structure calculations.

Templated Crystallization of Calcite on Patterned Self-Assembled Monolayers

2000 ◽  
Vol 620 ◽  
Author(s):  
Joanna Aizenberg
Keyword(s):  
Functional Groups ◽  
Crystallographic Orientation ◽  
Crystallization Process ◽  
Inorganic Materials ◽  
Fine Tuning ◽  
Self Assembled Monolayers ◽  
Experimental Conditions ◽  
Wide Range ◽  
Assembled Monolayers ◽  
Self Assembled

ABSTRACTMicropatterned self-assembled monolayers (SAMs) that serve as substrates for nucleation provide a way of controlling various aspects of the crystallization process with a previously unreachable precision. We focus on crystallization of calcite (CaCO3) on SAMs of HS(CH2)nX (X = CO2H, CH3, SO3H, OH, N(CH3)3Cl) supported on Ag and Au. Fine-tuning of the crystallographic orientation of the forming crystals has been achieved by using different functional groups and metal substrates. By patterning SAMs with microregions having different nucleating activities and proper geometry, it is possible to confine crystallization to well defined, spatially delineated sites. This method provides means to fabricate arbitrarily patterned calcitic arrays with controlled density of nucleation, crystallographic orientation, and crystal sizes. The experimental conditions and the mechanisms discussed can be applied to the templated nucleation of a wide range of inorganic materials.

scholarly journals Generic phase diagram of binary superlattices

2016 ◽  
Vol 113 (37) ◽  
pp. 10269-10274 ◽  
Author(s):  
Alexei V. Tkachenko
Keyword(s):  
Phase Diagram ◽  
Phase Behavior ◽  
Hard Spheres ◽  
General Procedure ◽  
Particle Size Ratio ◽  
System Composition ◽  
Wide Range ◽  
Self Assembled ◽  
Model Features ◽  
2D And 3D

Emergence of a large variety of self-assembled superlattices is a dramatic recent trend in the fields of nanoparticle and colloidal sciences. Motivated by this development, we propose a model that combines simplicity with a remarkably rich phase behavior applicable to a wide range of such self-assembled systems. Those systems include nanoparticle and colloidal assemblies driven by DNA-mediated interactions, electrostatics, and possibly, controlled drying. In our model, a binary system of large and small hard spheres (L and S, respectively) interacts via selective short-range (“sticky”) attraction. In its simplest version, this binary sticky sphere model features attraction only between S and L particles. We show that, in the limit when this attraction is sufficiently strong compared with kT, the problem becomes purely geometrical: the thermodynamically preferred state should maximize the number of LS contacts. A general procedure for constructing the phase diagram as a function of system composition f and particle size ratio r is outlined. In this way, the global phase behavior can be calculated very efficiently for a given set of plausible candidate phases. Furthermore, the geometric nature of the problem enables us to generate those candidate phases through a well-defined and intuitive construction. We calculate the phase diagrams for both 2D and 3D systems and compare the results with existing experiments. Most of the 3D superlattices observed to date are featured in our phase diagram, whereas several more are predicted for future discovery.

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