Self-assembly of gold nanowire networks into gold foams: production, ultrastructure and applications

2017 ◽  
Vol 4 (6) ◽  
pp. 1033-1041 ◽  
Author(s):  
A. Jakhmola ◽  
M. Celentano ◽  
R. Vecchione ◽  
A. Manikas ◽  
E. Battista ◽  
...  
Keyword(s):  
Nanostructured Materials ◽  
Self Assembly ◽  
Fine Tuning ◽  
Gold Nanowire ◽  
Green Nanotechnology ◽  
Nanowire Networks

Fine-tuning the shape of nanostructured materials through easy and sustainable methods is a challenging task for green nanotechnology.

Investigation of Au SAMs Photoclick Derivatization by PM-IRRAS

2019 ◽  
Author(s):  
Mark Workentin ◽  
François Lagugné-Labarthet ◽  
Sidney Legge
Keyword(s):  
Cell Adhesion ◽  
Self Assembly ◽  
Materials Science ◽  
Fibroblast Cell ◽  
Fine Tuning ◽  
Chemical System ◽  
Infrared Reflection ◽  
Assembled Monolayers ◽  
One Step ◽  
High Degree

In this work we present a clean one-step process for modifying headgroups of self-assembled monolayers (SAMs) on gold using photo-enabled click chemistry. A thiolated, cyclopropenone-caged strained alkyne precursor was first functionalized onto a flat gold substrate through self-assembly. Exposure of the cyclopropenone SAM to UV-A light initiated the efficient photochemical decarbonylation of the cyclopropenone moiety, revealing the strained alkyne capable of undergoing the interfacial strain-promoted alkyne-azide cycloaddition (SPAAC). Irradiated SAMs were derivatized with a series of model azides with varied hydrophobicity to demonstrate the generality of this chemical system for the modification and fine-tuning of the surface chemistry on gold substrates. SAMs were characterized at each step with polarization-modulation infrared reflection-absorption spectroscopy (PM-IRRAS) to confirm successful functionalization and reactivity. Furthermore, to showcase the compatibility of this approach with biochemical applications, cyclopropenone SAMs were irradiated and modified with azide-bearing cell adhesion peptides to promote human fibroblast cell adhesion, then imaged by live cell fluorescence microscopy. Thus, the “photoclick” methodology reported here represents an improved, versatile, catalyst-free protocol that allows for a high degree of control over the modification of material surfaces, with applicability in materials science as well as biochemistry.<br>

scholarly journals Kinetic Constraints in the Specific Interaction between Phosphorylated Ubiquitin and Proteasomal Shuttle Factors

Biomolecules ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1008
Author(s):  
Ling-Yun Qin ◽  
Zhou Gong ◽  
Kan Liu ◽  
Xu Dong ◽  
Chun Tang
Keyword(s):  
Exchange Rate ◽  
Self Assembly ◽  
Solution Structure ◽  
Specific Interaction ◽  
Dissociation Rate ◽  
Fine Tuning ◽  
Binding Mechanism ◽  
Kinetics Analysis ◽  
Kinetic Constraint ◽  
Thermodynamic Basis

Ubiquitin (Ub) specifically interacts with the Ub-associating domain (UBA) in a proteasomal shuttle factor, while the latter is involved in either proteasomal targeting or self-assembly coacervation. PINK1 phosphorylates Ub at S65 and makes Ub alternate between C-terminally relaxed (pUbRL) and retracted conformations (pUbRT). Using NMR spectroscopy, we show that pUbRL but not pUbRT preferentially interacts with the UBA from two proteasomal shuttle factors Ubqln2 and Rad23A. Yet discriminatorily, Ubqln2-UBA binds to pUb more tightly than Rad23A does and selectively enriches pUbRL upon complex formation. Further, we determine the solution structure of the complex between Ubqln2-UBA and pUbRL and uncover the thermodynamic basis for the stronger interaction. NMR kinetics analysis at different timescales further suggests an indued-fit binding mechanism for pUb-UBA interaction. Notably, at a relatively low saturation level, the dissociation rate of the UBA-pUbRL complex is comparable with the exchange rate between pUbRL and pUbRT. Thus, a kinetic constraint would dictate the interaction between Ub and UBA, thus fine-tuning the functional state of the proteasomal shuttle factors.

Self-Assembly of Organocatalysts: Fine-Tuning Organocatalytic Reactions.

ChemInform ◽  
2007 ◽  
Vol 38 (18) ◽  
Author(s):  
Matthew L. Clarke ◽  
Jose A. Fuentes
Keyword(s):  
Self Assembly ◽  
Fine Tuning ◽  
Organocatalytic Reactions

scholarly journals Towards supramolecular nanostructured materials: control of the self-assembly of ionic bent-core amphiphiles

2020 ◽  
Vol 8 (6) ◽  
pp. 1998-2007 ◽  
Author(s):  
Martín Castillo-Vallés ◽  
Miguel Cano ◽  
Ana Bermejo-Sanz ◽  
Nélida Gimeno ◽  
M. Blanca Ros
Keyword(s):  
Nanostructured Materials ◽  
Self Assembly ◽  
Molecular Design ◽  
The Self ◽  
Bottom Up

Bottom-up self-assembly: the formation of mesophases and nanostructures in solution from ionic bent-core dendrimers has been systematically studied by molecular design.

Spinning Hierarchical Gold Nanowire Microfibers by Shear Alignment and Intermolecular Self-Assembly

ACS Nano ◽  
2017 ◽  
Vol 11 (5) ◽  
pp. 4934-4942 ◽  
Author(s):  
Beate Reiser ◽  
Dominik Gerstner ◽  
Lola Gonzalez-Garcia ◽  
Johannes H. M. Maurer ◽  
Ioannis Kanelidis ◽  
...  
Keyword(s):  
Self Assembly ◽  
Gold Nanowire ◽  
Shear Alignment

Templated Gold Nanowire Self-Assembly on Carbon Substrates

2001 ◽  
Vol 13 (23) ◽  
pp. 1800-1803 ◽  
Author(s):  
T. O. Hutchinson ◽  
Y.-P. Liu ◽  
C. Kiely ◽  
C. J. Kiely ◽  
M. Brust
Keyword(s):  
Self Assembly ◽  
Gold Nanowire ◽  
Carbon Substrates

From supramolecular chemistry to nanotechnology: Assembly of 3D nanostructures

2009 ◽  
Vol 81 (12) ◽  
pp. 2225-2233 ◽  
Author(s):  
Xing Yi Ling ◽  
David N. Reinhoudt ◽  
Jurriaan Huskens
Keyword(s):  
Supramolecular Chemistry ◽  
Self Assembly ◽  
Supramolecular Assembly ◽  
Fine Tuning ◽  
Nanoparticle Assembly ◽  
Layer By Layer ◽  
Surface Binding ◽  
Free Standing ◽  
Functionalized Nanoparticles ◽  
Assembled Monolayers

Fabricating well-defined and stable nanoparticle crystals in a controlled fashion receives growing attention in nanotechnology. The order and packing symmetry within a nanoparticle crystal is of utmost importance for the development of materials with unique optical and electronic properties. To generate stable and ordered 3D nanoparticle structures, nanotechnology is combined with supramolecular chemistry to control the self-assembly of 2D and 3D receptor-functionalized nanoparticles. This review focuses on the use of molecular recognition chemistry to establish stable, ordered, and functional nanoparticle structures. The host–guest complexation of β-cyclodextrin (CD) and its guest molecules (e.g., adamantane and ferrocene) are applied to assist the nanoparticle assembly. Direct adsorption of supramolecular guest- and host-functionalized nanoparticles onto (patterned) CD self-assembled monolayers (SAMs) occurs via multivalent host–guest interactions and layer-by-layer (LbL) assembly. The reversibility and fine-tuning of the nanoparticle-surface binding strength in this supramolecular assembly scheme are the control parameters in the process. Furthermore, the supramolecular nanoparticle assembly has been integrated with top-down nanofabrication schemes to generate stable and ordered 3D nanoparticle structures, with controlled geometries and sizes, on surfaces, other interfaces, and as free-standing structures.

Self-assembly of protein-zwitterionic polymer bioconjugates into nanostructured materials

2016 ◽  
Vol 7 (13) ◽  
pp. 2410-2418 ◽  
Author(s):  
Dongsook Chang ◽  
Bradley D. Olsen
Keyword(s):  
Nanostructured Materials ◽  
Self Assembly ◽  
Fluorescent Protein ◽  
Phase Behaviour ◽  
Solution Phase ◽  
Red Fluorescent Protein ◽  
Polymer Backbone ◽  
High Charge Density ◽  
Zwitterionic Polymer ◽  
Concentrated Solution

Bioconjugates of a red fluorescent protein mCherry and a zwitterionic polymer (PDMAPS) are self-assembled into nanostructured materials. The concentrated solution phase behaviour is studied to elucidate the effect of high charge density along the polymer backbone.

Sign in / Sign up

Export Citation Format

Share Document