Self-Assembly of A1B1A2(B2) Branched Tetrablock Copolymer: Length Scale and Phase Transition

2021 ◽  
pp. 138451
Author(s):  
Bin Zhao ◽  
Chao Wang ◽  
Yingcai Chen
Keyword(s):  
Phase Transition ◽  
Self Assembly ◽  
Length Scale

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

Biomimetic materials: An introduction

1992 ◽  
Vol 50 (2) ◽  
pp. 1020-1021 ◽  
Author(s):  
M. Sarikaya ◽  
J. T. Staley ◽  
I. A. Aksay
Keyword(s):  
Self Assembly ◽  
Structural Control ◽  
Hierarchical Structures ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
Length Scale ◽  
Spider Webs ◽  
Biomimetic Materials ◽  
Synthetic Materials ◽  
All Ceramic

Biomimetics is an area of research in which the analysis of structures and functions of natural materials provide a source of inspiration for design and processing concepts for novel synthetic materials. Through biomimetics, it may be possible to establish structural control on a continuous length scale, resulting in superior structures able to withstand the requirements placed upon advanced materials. It is well recognized that biological systems efficiently produce complex and hierarchical structures on the molecular, micrometer, and macro scales with unique properties, and with greater structural control than is possible with synthetic materials. The dynamism of these systems allows the collection and transport of constituents; the nucleation, configuration, and growth of new structures by self-assembly; and the repair and replacement of old and damaged components. These materials include all-organic components such as spider webs and insect cuticles (Fig. 1); inorganic-organic composites, such as seashells (Fig. 2) and bones; all-ceramic composites, such as sea urchin teeth, spines, and other skeletal units (Fig. 3); and inorganic ultrafine magnetic and semiconducting particles produced by bacteria and algae, respectively (Fig. 4).

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.

Hard Materials with Tunable Porosity

MRS Bulletin ◽  
2009 ◽  
Vol 34 (8) ◽  
pp. 561-568 ◽  
Author(s):  
Jonah Erlebacher ◽  
Ram Seshadri
Keyword(s):  
Porous Materials ◽  
Self Assembly ◽  
Porous Metal ◽  
Ceramic Materials ◽  
Equilibrium Temperature ◽  
Length Scale ◽  
Porous Metals ◽  
Hard Materials ◽  
Mesoporous Zeolites ◽  
Pattern Forming

AbstractPorous metals and ceramic materials are of critical importance in catalysis, sensing, and adsorption technologies and exhibit unusual mechanical, magnetic, electrical, and optical properties compared to nonporous bulk materials. Materials with nanoscale porosity often are formed through molecular self-assembly processes that lock in a particular length scale; consider, for instance, the assembly of crystalline mesoporous zeolites with a pore size of 2–50 nm or the evolution of structural domains in block copolymers. Of recent interest has been the identification of general kinetic pattern-forming principles that underlie the formation of mesoporous materials without a locked- in length scale. When materials are kinetically locked out of thermodynamic equilibrium, temperature or chemistry can be used as a “knob” to tune their microstructure and properties. In this issue of the MRS Bulletin, we explore new porous metal and ceramic materials, which we collectively refer to as “hard” materials, formed by pattern-forming instabilities, either in the bulk or at interfaces, and discuss how such nonequilibrium processing can be used to tune porosity and properties. The focus on hard materials here involves thermal, chemical, and electrochemical processing usually not compatible with soft (for example, polymeric) porous materials and generally adds to the rich variety of routes to fabricate porous materials.

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

scholarly journals Preparation and self-assembly of two-length-scale A-b-(B-b-A)n-b-B multiblock copolymers

Soft Matter ◽  
2012 ◽  
Vol 8 (16) ◽  
pp. 4479 ◽  
Author(s):  
Martin Faber ◽  
Vincent S. D. Voet ◽  
Gerrit ten Brinke ◽  
Katja Loos
Keyword(s):  
Self Assembly ◽  
Length Scale ◽  
Multiblock Copolymers

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
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