Nonequilibrum phase transition in the light-actuated self-assembly of nanoparticles: effects of surfaces and stochastic forces

2019 ◽  
Author(s):  
Haojie Ji ◽  
Robert Collison ◽  
Daniel Thomas ◽  
Luat Vuong
Keyword(s):  
Phase Transition ◽  
Self Assembly ◽  
Stochastic Forces

Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

2017 ◽  
Author(s):  
Niamh Mac Fhionnlaoich ◽  
Stephen Schrettl ◽  
Nicholas B. Tito ◽  
Ye Yang ◽  
Malavika Nair ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Nematic Phase ◽  
Hierarchical Control ◽  
Building Blocks ◽  
Model System ◽  
Microscopic Level ◽  
Reversible Process ◽  
Thermotropic Liquid Crystal

The arrangement of nanoscale building blocks into patterns with microscale periodicity is challenging to achieve via self-assembly processes. Here, we report on the phase transition-driven collective assembly of gold nanoparticles in a thermotropic liquid crystal. A temperature-induced transition from the isotropic to the nematic phase leads to the assembly of individual nanometre-sized particles into arrays of micrometre-sized aggregates, whose size and characteristic spacing can be tuned by varying the cooling rate. This fully reversible process offers hierarchical control over structural order on the molecular, nanoscopic, and microscopic level and is an interesting model system for the programmable patterning of nanocomposites with access to micrometre-sized periodicities.

Visualizing the Initial Step of Self-Assembly and the Phase Transition by Stereogenic Amphiphiles with Aggregation-Induced Emission

ACS Nano ◽  
2018 ◽  
Vol 13 (1) ◽  
pp. 839-846 ◽  
Author(s):  
Hui-Qing Peng ◽  
Bin Liu ◽  
Peifa Wei ◽  
Pengfei Zhang ◽  
Haoke Zhang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Self Assembly ◽  
Initial Step ◽  
Aggregation Induced Emission

Solvatomorphs of (Bu4N)2[{Ag(N2-py)}2Mo8O26]: structure, colouration and phase transition

CrystEngComm ◽  
2021 ◽  
Author(s):  
Pavel A Abramov ◽  
Vladislav Komarov ◽  
Denis P Pishchur ◽  
Veronica S. Sulyaeva ◽  
Enrico Benassi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Self Assembly ◽  
Two Phases

Self-assembly of (Bu4N)4[β-Mo8O26], AgNO3 and N2-py (N2-py = 2,6-diaminopyridine) in DMF solution results in (Bu4N)2[β-{Ag(N2-py)}2Mo8O26] complex which crystallises as two phases: one (OP) is orange in colour and consists of...

scholarly journals Concentration-driven phase transition and self-assembly in drying droplets of diluting whole blood

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anusuya Pal ◽  
Amalesh Gope ◽  
John D. Obayemi ◽  
Germano S. Iannacchione
Keyword(s):  
Phase Transition ◽  
Self Assembly ◽  
Whole Blood ◽  
Morphological Analysis ◽  
Hierarchical Structures ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Colloidal Systems ◽  
Functional Complexity ◽  
Sharp Phase Transition

Abstract Multi-colloidal systems exhibit a variety of structural and functional complexity owing to their ability to interact amongst different components into self-assembled structures. This paper presents experimental confirmations that reveal an interesting sharp phase transition during the drying state and in the dried film as a function of diluting concentrations ranging from 100% (undiluted whole blood) to 12.5% (diluted concentrations). An additional complementary contact angle measurement exhibits a monotonic decrease with a peak as a function of drying. This peak is related to a change in visco-elasticity that decreases with dilution, and disappears at the dilution concentration for the observed phase transition equivalent to 62% (v/v). This unique behavior is clearly commensurate with the optical image statistics and morphological analysis; and it is driven by the decrease in the interactions between various components within this bio-colloid. The implications of these phenomenal systems may address many open-ended questions of complex hierarchical structures.

Fluorescence Probing of the Temperature-Induced Phase Transition in a Glycolipid Self-Assembly: Hexagonal ↔ Micellar and Cubic ↔ Lamellar

Langmuir ◽  
2012 ◽  
Vol 28 (11) ◽  
pp. 4989-4995 ◽  
Author(s):  
N. Idayu Zahid ◽  
Osama K. Abou-Zied ◽  
Rauzah Hashim ◽  
Thorsten Heidelberg
Keyword(s):  
Phase Transition ◽  
Self Assembly ◽  
Fluorescence Probing

Self-assembly of (A2B2)5 multigraft block copolymer: The length scale and phase transition

2019 ◽  
Vol 721 ◽  
pp. 1-6
Author(s):  
Di Zhang ◽  
Zhanwei Shao ◽  
Weiguo Hu ◽  
Yuci Xu
Keyword(s):  
Phase Transition ◽  
Block Copolymer ◽  
Self Assembly ◽  
Length Scale

scholarly journals Molecular ordering at electrified interfaces: Template and potential effects

2014 ◽  
Vol 10 ◽  
pp. 2243-2254 ◽  
Author(s):  
Thanh Hai Phan ◽  
Klaus Wandelt
Keyword(s):  
Phase Transition ◽  
Electron Transfer ◽  
Self Assembly ◽  
Electrode Surface ◽  
Bone Structure ◽  
Scanning Tunneling ◽  
Cyclic Voltammogram ◽  
Tunneling Microscopy ◽  
Stripe Pattern ◽  
Electrode Potentials

A combination of cyclic voltammetry and in situ scanning tunneling microscopy was employed to examine the adsorption and phase transition of 1,1’-dibenzyl-4,4’-bipyridinium molecules (abbreviated as DBV2+) on a chloride-modified Cu(111) electrode surface. The cyclic voltammogram (CV) of the Cu(111) electrode exposed to a mixture of 10 mM HCl and 0.1 mM DBVCl2 shows three distinguishable pairs of current waves P1/P’1, P2/P’2, and P3/P’3 which are assigned to two reversible electron transfer steps, representing the reduction of the dicationic DBV2+ to the corresponding radical monocationic DBV+• (P1/P’1) and then to the uncharged DBV0 (P3/P’3) species, respectively, as well as the chloride desorption/readsorption processes (P2/P’2). At positive potentials (i.e., above P1) the DBV2+ molecules spontaneously adsorb and form a highly ordered phase on the c(p × √3)-precovered Cl/Cu(111) electrode surface. A key element of this DBV2+ adlayer is an assembly of two individual DBV2+ species which, lined up, forms a so-called “herring-bone” structure. Upon lowering the electrode potential the first electron transfer step (at P1) causes a phase transition from the DBV2+-related herring-bone phase to the so-called "alternating stripe" pattern built up by the DBV+• species following a nucleation and growth mechanism. Comparison of both observed structures with those found earlier at different electrode potentials on a c(2 × 2)Cl-precovered Cu(100) electrode surface enables a clear assessment of the relative importance of adsorbate–substrate and adsorbate–adsorbate interactions, i.e., template vs self-assembly effects, in the structure formation process of DBV cations on these modified Cu electrode surfaces.

Switchable Self-Assembly of Elastin- and Resilin-Based Block Copolypeptides with Converse Phase Transition Behaviors

2021 ◽  
Author(s):  
Aamna Basheer ◽  
Shahzaib Shahid ◽  
Min Jung Kang ◽  
Jae Hee Lee ◽  
Jae Sang Lee ◽  
...  
Keyword(s):  
Phase Transition ◽  
Self Assembly ◽  
Block Copolypeptides
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