scholarly journals Operando laser scattering: probing the evolution of local pH gradients on complex electrode architectures

2021 ◽  
Author(s):  
Vitali Grozovski ◽  
Pavel Moreno-Garcia ◽  
Elea Karst ◽  
María de Jesús Gálvez-Vázquez ◽  
Alexander Fluegel ◽  
...  
Keyword(s):  
Self Assembly ◽  
Ph Sensing ◽  
Laser Scattering ◽  
Ph Gradients ◽  
Non Invasive ◽  
Diffusion Layers ◽  
Real Time Visualization ◽  
Precipitation Phenomena ◽  
Solid Liquid ◽  
Local Ph

Abstract Self-assembly, complexation, agglomeration and precipitation phenomena relevant to biological, electrocatalytic and technological processes are strongly influenced by changes of the local pH at the solid-liquid interfaces where they occur. Understanding proton dynamics in the diffusion layers generated by these processes is of prime importance to improve their diagnosis and enable modelling and better control over them. Here we introduce a non-invasive pH-sensing approach that is based on the Tyndall effect enhancement modulated by pH-controlled agglomeration events. Using metal electrodeposition for advanced semiconductor wiring technology as a test vehicle, we demonstrate that our proposed strategy simultaneously provides real-time visualization of the pH dynamics and pH-guided reactivity with high spatial resolution without physically or chemically influencing the investigated surfaces. We suggest that its applicability can be universally extended to other relevant nanoaggregation/decomplexation processes occurring at light-addressable interfaces provided the probed colloids are smaller than the wavelength of visible light.

Microaligned collagen matrices by hydrodynamic focusing: controlling the pH-induced self-assembly

2005 ◽  
Vol 898 ◽  
Author(s):  
Sarah Köester ◽  
Jennie B Leach ◽  
Thomas Pfohl ◽  
Joyce Y Wong
Keyword(s):  
Self Assembly ◽  
Type I Collagen ◽  
Polarized Light ◽  
Type I ◽  
Hydrodynamic Focusing ◽  
Microfluidic Mixing ◽  
Ph Gradients ◽  
The Hierarchical Structure ◽  
Local Ph

AbstractThe hierarchical structure of type I collagen fibrils is a key contributor to the mechanical properties of the extracellular matrix (ECM). It is known that the process of in vitro fibrillogenesis strongly depends on the pH of the collagen solution. To date, there are few methods available for precisely controlling and investigating the dependence of collagen fibril assembly on the local pH. The objective of this work was to create highly defined pH gradients to systematically determine the effects of local pH on microscale collagen fibrillogenesis and alignment. We use a microfluidic mixing device to create a diffusion controlled pH gradient, which in turn initiates the self-assembly and concurrent flow-alignment of soluble collagen. Finite element method simulations of the hydrodynamic and diffusive phenomena are used to calculate the local concentrations of the components involved in the reaction. We develop a model to analytically calculate the local pH in the microfluidic device from these concentrations. A comparison with the experimental results from polarized light microscopy are in good agreement with the simulations.

scholarly journals Constructing Large 2D Lattices Out of DNA-Tiles

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1502
Author(s):  
Johannes M. Parikka ◽  
Karolina Sokołowska ◽  
Nemanja Markešević ◽  
J. Jussi Toppari
Keyword(s):  
Self Assembly ◽  
Dna Nanotechnology ◽  
Building Blocks ◽  
High Yield ◽  
Dna Nanostructures ◽  
Liquid Interfaces ◽  
Basic Principles ◽  
Dna Tiles ◽  
One Step ◽  
Solid Liquid

The predictable nature of deoxyribonucleic acid (DNA) interactions enables assembly of DNA into almost any arbitrary shape with programmable features of nanometer precision. The recent progress of DNA nanotechnology has allowed production of an even wider gamut of possible shapes with high-yield and error-free assembly processes. Most of these structures are, however, limited in size to a nanometer scale. To overcome this limitation, a plethora of studies has been carried out to form larger structures using DNA assemblies as building blocks or tiles. Therefore, DNA tiles have become one of the most widely used building blocks for engineering large, intricate structures with nanometer precision. To create even larger assemblies with highly organized patterns, scientists have developed a variety of structural design principles and assembly methods. This review first summarizes currently available DNA tile toolboxes and the basic principles of lattice formation and hierarchical self-assembly using DNA tiles. Special emphasis is given to the forces involved in the assembly process in liquid-liquid and at solid-liquid interfaces, and how to master them to reach the optimum balance between the involved interactions for successful self-assembly. In addition, we focus on the recent approaches that have shown great potential for the controlled immobilization and positioning of DNA nanostructures on different surfaces. The ability to position DNA objects in a controllable manner on technologically relevant surfaces is one step forward towards the integration of DNA-based materials into nanoelectronic and sensor devices.

Dynamically resolved self-assembly of S-layer proteins on solid surfaces

2018 ◽  
Vol 54 (73) ◽  
pp. 10264-10267 ◽  
Author(s):  
Bart Stel ◽  
Fernando Cometto ◽  
Behzad Rad ◽  
James J. De Yoreo ◽  
Magalí Lingenfelder
Keyword(s):  
Self Assembly ◽  
Spatial Scales ◽  
Liquid Interface ◽  
Solid Surfaces ◽  
Solid Liquid Interface ◽  
Solid Liquid

Kinetic pathway in S-layer self-assembly at the solid–liquid interface across time (second to hours) and spatial scales (nm to microns).

Self-Assembly, Dynamics, and Polymorphism of hIAPP(20–29) Aggregates at Solid–Liquid Interfaces

Langmuir ◽  
2016 ◽  
Vol 33 (1) ◽  
pp. 372-381 ◽  
Author(s):  
Roozbeh Hajiraissi ◽  
Ignacio Giner ◽  
Guido Grundmeier ◽  
Adrian Keller
Keyword(s):  
Self Assembly ◽  
Liquid Interfaces ◽  
Solid Liquid

Photoluminescent organic polymer nanofilms formed in water through a self-assembly formation mechanism

2019 ◽  
Vol 7 (11) ◽  
pp. 3286-3293 ◽  
Author(s):  
Baoxi Feng ◽  
Zhen Xu ◽  
Jiayu Wang ◽  
Fei Feng ◽  
Lin Wang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Real Time ◽  
Formation Mechanism ◽  
Self Assembly ◽  
Organic Polymer ◽  
Assembly Mechanism ◽  
Real Time Visualization ◽  
Dynamics Simulations

A self-assembly mechanism is demonstrated for the formation of polymer nanofilms based on real-time visualization and molecular dynamics simulations.

Silica-coated bismuth sulfide nanorods as multimodal contrast agents for a non-invasive visualization of the gastrointestinal tract

Nanoscale ◽  
2015 ◽  
Vol 7 (29) ◽  
pp. 12581-12591 ◽  
Author(s):  
Xiaopeng Zheng ◽  
Junxin Shi ◽  
Yang Bu ◽  
Gan Tian ◽  
Xiao Zhang ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Contrast Agents ◽  
Real Time ◽  
Bismuth Sulfide ◽  
Non Invasive ◽  
Real Time Visualization

In this paper we have prepared Bi2S3@SiO2 nanorods designed as binary contrast agents for a non-invasive and real-time visualization of the gastrointestinal tract.

Chiral Expression at the Solid−Liquid Interface: A Joint Experimental and Theoretical Study of the Self-Assembly of Chiral Porphyrins on Graphite

Langmuir ◽  
2008 ◽  
Vol 24 (17) ◽  
pp. 9566-9574 ◽  
Author(s):  
Mathieu Linares ◽  
Patrizia Iavicoli ◽  
Krystallia Psychogyiopoulou ◽  
David Beljonne ◽  
Steven De Feyter ◽  
...  
Keyword(s):  
Self Assembly ◽  
Theoretical Study ◽  
Liquid Interface ◽  
The Self ◽  
Solid Liquid Interface ◽  
Solid Liquid

Potential- and concentration-dependent self-assembly structures at solid/liquid interfaces

Nanoscale ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 3438-3443 ◽  
Author(s):  
Zhen-Feng Cai ◽  
Hui-Juan Yan ◽  
Dong Wang ◽  
Li-Jun Wan
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Scanning Tunneling ◽  
Liquid Interfaces ◽  
Tunneling Microscopy ◽  
Controlled Assembly ◽  
Electrochemical Scanning Tunneling Microscopy ◽  
Solid Liquid

We report the potential and concentration controlled assembly of an alkyl-substituted benzo[1,2-b:4,5-b′]dithiophene (DDBDT) on an Au(111) electrode byin situelectrochemical scanning tunneling microscopy (ECSTM).

A single-step multi-level supramolecular system for cancer sonotheranostics

2019 ◽  
Vol 4 (1) ◽  
pp. 190-195 ◽  
Author(s):  
Huirong Lin ◽  
Shuang Li ◽  
Junqing Wang ◽  
Chengchao Chu ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Single Step ◽  
Supramolecular System ◽  
Therapeutic Effects ◽  
Invasive Approach ◽  
Non Invasive ◽  
Ionic Crosslinking ◽  
Critical Issues ◽  
Multi Level

A multi-level supramolecular system produced by single-step Fe3+-mediated ionic crosslinking self-assembly can overcome the critical issues of current sonodynamic therapy (SDT) and address the need to monitor therapeutic effects in vivo with a non-invasive approach.

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