scholarly journals “Concentration-in-Control” self-assembly concept at the liquid–solid interface challenged

2021 ◽  
Author(s):  
Gangamallaiah Velpula ◽  
Cristina Martin ◽  
Brent Daelemans ◽  
Gunther Hennrich ◽  
Mark Van der Auweraer ◽  
...  
Keyword(s):  
Self Assembly ◽  
Solute Concentration ◽  
High Density ◽  
Molecular Network ◽  
Low Density ◽  
Solid Interface ◽  
Self Assembled

Surprise! against expectations, increasing (decreasing) the solute concentration leads to the formation of a low-density (high-density) self-assembled molecular network at the liquid–solid interface.

scholarly journals Hierarchical two-dimensional molecular assembly through dynamic combination of conformational states at the liquid/solid interface

2020 ◽  
Vol 11 (34) ◽  
pp. 9254-9261
Author(s):  
Matsuhiro Maeda ◽  
Ruri Nakayama ◽  
Steven De Feyter ◽  
Yoshito Tobe ◽  
Kazukuni Tahara
Keyword(s):  
Building Blocks ◽  
Molecular Assembly ◽  
Molecular Network ◽  
Two Dimensional ◽  
Conformational States ◽  
Solid Interface ◽  
Promising Strategy ◽  
Self Assembled

Self-sorting of multiple building blocks for correctly positioning molecules through orthogonal recognition is a promising strategy for construction of a hierarchical self-assembled molecular network (SAMN) on a surface.

scholarly journals Trapping a pentagonal molecule in a self-assembled molecular network: an alkoxylated isosceles triangular molecule does the job

2020 ◽  
Vol 56 (40) ◽  
pp. 5401-5404 ◽  
Author(s):  
Masaru Anzai ◽  
Masahiko Iyoda ◽  
Steven De Feyter ◽  
Yoshito Tobe ◽  
Kazukuni Tahara
Keyword(s):  
Self Assembly ◽  
Molecular Network ◽  
Self Assembled

We herein report a unique example of on-surface adaptive self-assembly.

Side chain position, length and odd/even effects on the 2D self-assembly of mono-substituted anthraquinone derivatives at the liquid/solid interface

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 93337-93346 ◽  
Author(s):  
Yi Hu ◽  
Kai Miao ◽  
Bao Zha ◽  
Xinrui Miao ◽  
Li Xu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Side Chain ◽  
Side Chains ◽  
Solid Interface ◽  
Anthraquinone Derivatives ◽  
Self Assembled

This work provides efficient methods for regulating self-assembled structures by changing the position, length and odd/even properties of the side chains.

Quantitative Detection with Surface Enhanced Raman Scattering (SERS) Using Self-Assembled Gold Nanoparticle Cluster Arrays

2013 ◽  
Vol 66 (9) ◽  
pp. 1034 ◽  
Author(s):  
Sanghamitra Dinda ◽  
Fung Ling Yap ◽  
Vignesh Suresh ◽  
Raju Kumar Gupta ◽  
Debajyoti Das ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Self Assembly ◽  
High Sensitivity ◽  
Surface Enhanced Raman Spectroscopy ◽  
High Density ◽  
Quantitative Detection ◽  
Surface Enhanced ◽  
Nanoparticle Clusters ◽  
Surface Enhanced Raman ◽  
Self Assembled

We analysed sensitivity of high-density arrays of self-assembled gold nanoparticle clusters towards trace analyte detection and quantitative determination by surface enhanced Raman spectroscopy (SERS) employing an aromatic thiol as probe molecule. Periodic nanoscale arrays of gold nanoparticle clusters consisting of an average of 18 nanoparticles per cluster, and exhibiting mean inter-particle and inter-cluster separations below 10 nm were prepared using electrostatic self-assembly on block copolymer templates. The concentration dependent scaling of SERS intensities and the lowest detection limits on the cluster arrays on silicon substrate was probed using 1-naphthalenethiol (NT) as test molecule. The substrates show a detection limit of 10 nM along with high sensitivity to changes in NT concentration, which we attribute to high density of hot-spots uniformly organised across the surface. The capability for facile realisation of such arrays without a clean room environment or expensive tools makes the approach suitable for adoption for economic and high-performing SERS sensors.

Molecular tuning of amino acids to form two-dimensional molecular networks driven by conformational preorganization

2016 ◽  
Vol 52 (97) ◽  
pp. 14055-14058 ◽  
Author(s):  
Young-Sang Youn ◽  
Aram Jeon ◽  
Do Hwan Kim ◽  
Hee-Seung Lee ◽  
Sehun Kim
Keyword(s):  
Amino Acids ◽  
Dft Calculations ◽  
Self Assembly ◽  
Intramolecular Interaction ◽  
The Self ◽  
Molecular Network ◽  
Molecular Networks ◽  
Two Dimensional ◽  
Self Assembled ◽  
Self Association

We investigated the self-assembly of rationally designed γ-Phe on Au(111) using STM with DFT calculations. In contrast to α-Phe, γ-Phe self-assembled into 2D molecular network. The better self-association was attributed to conformational preorganization through intramolecular interaction.

Quantitative defect studies in semiconductor TEM samples prepared by low angle ion milling

1995 ◽  
Vol 53 ◽  
pp. 512-513
Author(s):  
L. Mulestagno ◽  
J.C. Holzer ◽  
P. Fraundorf
Keyword(s):  
Sample Preparation ◽  
Milling Time ◽  
High Density ◽  
Low Density ◽  
Ion Milling ◽  
High Quality ◽  
Variable Angle ◽  
Major Disadvantage ◽  
Induced Defects

Due to the wealth of information, both analytical and structural that can be obtained from it TEM always has been a favorite tool for the analysis of process-induced defects in semiconductor wafers. The only major disadvantage has always been, that the volume under study in the TEM is relatively small, making it difficult to locate low density defects, and sample preparation is a somewhat lengthy procedure. This problem has been somewhat alleviated by the availability of efficient low angle milling.Using a PIPS® variable angle ion -mill, manufactured by Gatan, we have been consistently obtaining planar specimens with a high quality thin area in excess of 5 × 104 μm2 in about half an hour (milling time), which has made it possible to locate defects at lower densities, or, for defects of relatively high density, obtain information which is statistically more significant (table 1).

Scanning Electron Microscopic and Electrophoretic Observations on Barium Sulphate Used to Adsorb Clotting Factors

1975 ◽  
Vol 33 (02) ◽  
pp. 256-270
Author(s):  
R. M Howell ◽  
S. L. M Deacon
Keyword(s):  
Electron Microscopy ◽  
Factor Xa ◽  
Barium Sulphate ◽  
High Density ◽  
Low Density ◽  
Factor X ◽  
Clotting Factors ◽  
Electron Microscopic ◽  
Complementary Techniques ◽  
Scanning Electron

SummaryElectron microscopy and particle electrophoresis were found to be complementary techniques with which to complete the physical data from an earlier study on barium sulphates used to adsorb clotting factors from serum. The differences revealed by scanning electron microscopy (S. E. M.) in the physical shape of low and high density grades of barium sulphate particles appear to be of greater significance than charge as expressed by electrophoretic mobility, in determining whether or not precursor or preformed factor Xa is eluted.This conclusion was based on the finding that at pH values close to 7, where the adsorption from serum occurs, all samples with the exception of natural barytes were uncharged. However as the high-density, or soil-grade, was found by S. E. M. to consist of large solid crystals it was suggested that this shape might induce activation of factor X as a result of partial denaturation and consequent unfolding of the adsorbed protein. In contrast, uptake of protein into the centre of the porous aggregates revealed by S. E. M. pictures of low-density or X-ray grade barium sulphate may afford protection against denaturation and exposure of the enzyme site.The porous nature of particles of low-density barium sulphate compared with the solid crystalline forms of other grades accounts not only for its lower bulk density but also for its greater surface/gram ratio which is reflected by an ability to adsorb more protein from serum.Neither technique produced evidence from any of the samples to indicate the presence of stabilising agents sometimes used to coat particles in barium meals.

Nanoscale Self-Assembly Using Ion and Electron Beam Techniques: A Rapid Review

MRS Advances ◽  
2020 ◽  
Vol 5 (64) ◽  
pp. 3507-3520
Author(s):  
Chunhui Dai ◽  
Kriti Agarwal ◽  
Jeong-Hyun Cho
Keyword(s):  
Electron Beam ◽  
Self Assembly ◽  
Ion Beam ◽  
Three Dimensional ◽  
The Self ◽  
Stress Generation ◽  
Rapid Review ◽  
High Yield ◽  
3D Nanostructures ◽  
Self Assembled

AbstractNanoscale self-assembly, as a technique to transform two-dimensional (2D) planar patterns into three-dimensional (3D) nanoscale architectures, has achieved tremendous success in the past decade. However, an assembly process at nanoscale is easily affected by small unavoidable variations in sample conditions and reaction environment, resulting in a low yield. Recently, in-situ monitored self-assembly based on ion and electron irradiation has stood out as a promising candidate to overcome this limitation. The usage of ion and electron beam allows stress generation and real-time observation simultaneously, which significantly enhances the controllability of self-assembly. This enables the realization of various complex 3D nanostructures with a high yield. The additional dimension of the self-assembled 3D nanostructures opens the possibility to explore novel properties that cannot be demonstrated in 2D planar patterns. Here, we present a rapid review on the recent achievements and challenges in nanoscale self-assembly using electron and ion beam techniques, followed by a discussion of the novel optical properties achieved in the self-assembled 3D nanostructures.

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