Highly fluorescent free-standing films assembled from perylenediimide microcrystals for boosting aniline sensing

2020 ◽  
Vol 8 (4) ◽  
pp. 1421-1426 ◽  
Author(s):  
Baozhong Lü ◽  
Pengyu Li ◽  
Pengfei Li ◽  
Yantu Zhang ◽  
Klaus Müllen ◽  
...  
Keyword(s):  
Functional Materials ◽  
Molecular Assembly ◽  
Free Standing

Molecular assembly has emerged as a key protocol for designing functional materials, although building in task-specific applications remains challenging.

scholarly journals Programmable self-propelling actuators enabled by a dynamic helical medium

2021 ◽  
Vol 7 (32) ◽  
pp. eabh3505
Author(s):  
Ling-Ling Ma ◽  
Chao Liu ◽  
Sai-Bo Wu ◽  
Peng Chen ◽  
Quan-Ming Chen ◽  
...  
Keyword(s):  
Photon Energy ◽  
Power Transmission ◽  
Functional Materials ◽  
Molecular Assembly ◽  
Unique Case ◽  
Self Organized ◽  
Orbital Revolution ◽  
Intelligent Robotics

Rotation-translation conversion is a popular way to achieve power transmission in machinery, but it is rarely selected by nature. One unique case is that of bacteria swimming, which is based on the collective reorganization and rotation of flagella. Here, we mimic such motion using the light-driven evolution of a self-organized periodic arch pattern. The range and direction of translation are altered by separately varying the alignment period and the stimulating photon energy. Programmable self-propelling actuators are realized via a specific molecular assembly within a photoresponsive cholesteric medium. Through rationally presetting alignments, parallel transports of microspheres in customized trajectories are demonstrated, including convergence, divergence, gathering, and orbital revolution. This work extends the understanding of the rotation-translation conversion performed in an exquisitely self-organized system and may inspire future designs for functional materials and intelligent robotics.

Soft material nanoarchitectonics at interfaces: molecular assembly, nanomaterial synthesis, and life control

2019 ◽  
Vol 4 (1) ◽  
pp. 49-64 ◽  
Author(s):  
Katsuhiko Ariga ◽  
Xiaofang Jia ◽  
Lok Kumar Shrestha
Keyword(s):  
Functional Materials ◽  
Molecular Assembly ◽  
Soft Material ◽  
Nanomaterial Synthesis

Nanoarchitectonics would be a breakthrough paradigm for preparation of functional materials with soft material components from nanoscale units.

scholarly journals Atomic-resolution Probing of Anion Migration in Perovskites with In-situ (S)TEM

2021 ◽  
Vol 27 (S1) ◽  
pp. 170-171
Author(s):  
Yu Deng ◽  
Ruopeng Zhang ◽  
Jim Ciston ◽  
Karen C Bustillo ◽  
Colin Ophus ◽  
...  
Keyword(s):  
Domain Walls ◽  
Functional Performance ◽  
Chemical Change ◽  
Functional Materials ◽  
Atomic Resolution ◽  
Local Domain ◽  
Free Standing ◽  
Electrical Loading ◽  
Domain Structures

ABSTRACTPerovskites are promising functional materials for their optoelectronic properties and anion migration plays a key role in their functional performance [1-3]. By using in-situ (S)TEM mechanical and electrical testing in conjunction with 4D-STEM [4,5], we directly observed/probed anion migration in perovskites at atomic resolution (see Figure 1). Here, we studied the mechanism for the anion migration in perovskites such as (PbZr)TiO3 and BaTiO3, which is induced under the mechnaicl/electrical loading. To avoid the influence of the electron beam, we carried out the in-situ (S)TEM study at 60kv with low dose. And to avoid the possible strong size effect and the substrate (interface) influence, we prepared free-standing sub-micrometer single-crystalline structures to perform the experiments. Corresponding EDS and EELS examinations were performed to measure the local chemical change with applied stress and electrical currents. Our observations revealed the coexistence of multiple phase structures and hierarchical domain structures, as well as the greatly enhanced anion drifting and diffusion at the charged domain walls (Figure 2) and phase boundaries. The complex interaction between the local domain evolution and phase transition has been discussed. Based on above investigations, a model for anion migration in perovskire under mechanical/electrical loading has been presented.

scholarly journals Emerging functional materials based on chemically designed molecular recognition

BMC Materials ◽  
2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Wei Chen ◽  
Xiaohua Tian ◽  
Wenbo He ◽  
Jianwei Li ◽  
Yonghai Feng ◽  
...  
Keyword(s):  
Molecular Recognition ◽  
Material Science ◽  
Rational Design ◽  
Dynamic Properties ◽  
Functional Materials ◽  
Molecular Assembly ◽  
Modern Material ◽  
Chemical Recognition ◽  
Fundamental Research ◽  
Modern Material Science

AbstractThe specific interactions responsible for molecular recognition play a crucial role in the fundamental functions of biological systems. Mimicking these interactions remains one of the overriding challenges for advances in both fundamental research in biochemistry and applications in material science. However, current molecular recognition systems based on host–guest supramolecular chemistry rely on familiar platforms (e.g., cyclodextrins, crown ethers, cucurbiturils, calixarenes, etc.) for orienting functionality. These platforms limit the opportunity for diversification of function, especially considering the vast demands in modern material science. Rational design of novel receptor-like systems for both biological and chemical recognition is important for the development of diverse functional materials. In this review, we focus on recent progress in chemically designed molecular recognition and their applications in material science. After a brief introduction to representative strategies, we describe selected advances in these emerging fields. The developed functional materials with dynamic properties including molecular assembly, enzyme-like and bio-recognition abilities are highlighted. We have also selected materials with dynamic properties in contract to traditional supramolecular host–guest systems. Finally, the current limitations and some future trends of these systems are discussed.

scholarly journals Epitaxy, exfoliation, and strain-induced magnetism in rippled Heusler membranes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Dongxue Du ◽  
Sebastian Manzo ◽  
Chenyu Zhang ◽  
Vivek Saraswat ◽  
Konrad T. Genser ◽  
...  
Keyword(s):  
Dominant Role ◽  
Functional Materials ◽  
High Energy ◽  
Van Der Waals Interactions ◽  
Diffraction Reflection ◽  
X Ray Diffraction ◽  
Free Standing ◽  
Strain Gradients ◽  
Flexible Polymer ◽  
Transmission Electron

AbstractSingle-crystalline membranes of functional materials enable the tuning of properties via extreme strain states; however, conventional routes for producing membranes require the use of sacrificial layers and chemical etchants, which can both damage the membrane and limit the ability to make them ultrathin. Here we demonstrate the epitaxial growth of the cubic Heusler compound GdPtSb on graphene-terminated Al2O3 substrates. Despite the presence of the graphene interlayer, the Heusler films have epitaxial registry to the underlying sapphire, as revealed by x-ray diffraction, reflection high energy electron diffraction, and transmission electron microscopy. The weak Van der Waals interactions of graphene enable mechanical exfoliation to yield free-standing GdPtSb membranes, which form ripples when transferred to a flexible polymer handle. Whereas unstrained GdPtSb is antiferromagnetic, measurements on rippled membranes show a spontaneous magnetic moment at room temperature, with a saturation magnetization of 5.2 bohr magneton per Gd. First-principles calculations show that the coupling to homogeneous strain is too small to induce ferromagnetism, suggesting a dominant role for strain gradients. Our membranes provide a novel platform for tuning the magnetic properties of intermetallic compounds via strain (piezomagnetism and magnetostriction) and strain gradients (flexomagnetism).

NANOFABRICATION BY COVALENT MOLECULAR ASSEMBLY: A PATHWAY TO ROBUST STRUCTURES

COSMOS ◽  
2011 ◽  
Vol 07 (01) ◽  
pp. 31-42
Author(s):  
S. PUNIREDDY ◽  
S. JAYARAMAN ◽  
R. K. GUPTA ◽  
S. H. YEONG ◽  
F. ZHANG ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Mechanical Stability ◽  
Functional Materials ◽  
Molecular Assembly ◽  
Layer By Layer ◽  
Residual Solvent ◽  
Lbl Assembly ◽  
Wide Range ◽  
Free Environment ◽  
Areas Of Interest

A wide range of new materials for many applications can be formed by controlling the composition and order of constituents at the molecular level. For systems thus engineered, ensuring chemical, thermal and mechanical robustness is a major challenge. Consequently, polyimides and other imide-containing materials are attractive as matrices for functional materials. We investigate the construction of functional nanostructures in organic/polymeric matrices with clearly demonstrated chemical, thermal and mechanical stability. Surface functionalization, layer-by-layer (LBL) assembly in various media (including supercritical), incorporation of functional moieties, molecular orientation, and interfacial reactions are areas of interest. We demonstrate the robustness of ultrathin film structures containing polyimides and oligoimides formed by LBL molecular assembly with inter-layer covalent links. Covalent bonding between the layers provides strength, while utilizing a supercritical medium for the processing, results in the deployment of a solvent-free environment and avoids problems related to residual solvent, thereby improving film quality when compared to conventional films.

scholarly journals Plasma-based processes for planar and 3D surface patterning of functional nanoparticles

2019 ◽  
Vol 21 (11) ◽  
Author(s):  
S. Askari ◽  
H. Machhadani ◽  
J. Benedikt ◽  
U. Helmersson
Keyword(s):  
Self Assembly ◽  
Functional Materials ◽  
Surface Patterning ◽  
Large Area ◽  
Free Standing ◽  
Electrostatic Assembly ◽  
Functional Nanoparticles ◽  
Novel Approach ◽  
Device Integration ◽  
Precision Device

Abstract We present a gas-phase process for surface patterning and 3D self-assembly of nanoparticles (NPs) of functional materials such as metals, oxides, and nitrides. The method relies on electrostatic assembly of free-flying NPs with unipolar charge produced in plasma sources. We demonstrate the capability of the process in self-assembly of NPs, with the size in the range 10–60 nm, into arrays of free-standing 3D microstructures with complex morphologies. Considering that the plasma nanoparticle sources are compatible with synthesis of a large library of material NPs, the process introduces a novel approach for 3D printing of various functional NPs, high-precision device integration of NPs on sub-micrometer scales, and large-area parallel surface patterning of NPs.

SAMs-Drected Metallization and Its Application in Fabrication of Core-Shell Nanocomposites

2007 ◽  
Vol 121-123 ◽  
pp. 731-734
Author(s):  
Li Na Xu ◽  
K.C. Zhou ◽  
Sheng Li Xie ◽  
L. Huang ◽  
Ning Gu
Keyword(s):  
Functional Materials ◽  
Molecular Assembly ◽  
Control Surface ◽  
Core Shell ◽  
Research Attention ◽  
Nano Fabrication ◽  
Surface Functionality ◽  
Assembled Monolayers ◽  
Assembly Technology ◽  
Flexible Applications

Molecular assembly technology has attracted much research attention due to its flexible applications in modulation of surface property and construction of nanostructures and devices. Herein, a well-defined surface metallization technique has been achieved via anchoring electroless catalysts onto substrates’ surfaces with the pendant active groups of self-assembled monolayers. This method affords a means to control surface functionality at molecular level and has advantages over the conventional Sn-Pd methods, such as convenient operation, good reproducibility, increased longevity of the activated initiator and improved adhesion of metal deposition to substrates. Therefore, it has great significance in the fields of developing bottom-up combined micro/nano-fabrication technique. This metallization process has been successfully performed on hollow ceramic particles to fabricate light-weighted core-shell functional materials.

scholarly journals Molecular architectonics of DNA for functional nanoarchitectures

2020 ◽  
Vol 11 ◽  
pp. 124-140 ◽  
Author(s):  
Debasis Ghosh ◽  
Lakshmi P Datta ◽  
Thimmaiah Govindaraju
Keyword(s):  
Structural Engineering ◽  
Structural Characteristics ◽  
Persistence Length ◽  
Dna Nanotechnology ◽  
Functional Materials ◽  
Molecular Assembly ◽  
Structural And Functional Properties ◽  
The Creation ◽  
Functional Dna ◽  
Dna 2

DNA is the key biomolecule central to almost all processes in living organisms. The eccentric idea of utilizing DNA as a material building block in molecular and structural engineering led to the creation of numerous molecular-assembly systems and materials at the nanoscale. The molecular structure of DNA is believed to have evolved over billions of years, with structure and stability optimizations that allow life forms to sustain through the storage and transmission of genetic information with fidelity. The nanoscale structural characteristics of DNA (2 nm thickness and ca. 40–50 nm persistence length) have inspired the creation of numerous functional patterns and architectures through noncovalent conventional and unconventional base pairings as well as through mutual templating-interactions with small organic molecules and metal ions. The recent advancements in structural DNA nanotechnology allowed researchers to design new DNA-based functional materials with chemical and biological properties distinct from their parent components. The modulation of structural and functional properties of hybrid DNA ensembles of small functional molecules (SFMs) and short oligonucleotides by adapting the principles of molecular architectonics enabled the creation of novel DNA nanoarchitectures with potential applications, which has been termed as templated DNA nanotechnology or functional DNA nanoarchitectonics. This review highlights the molecular architectonics-guided design principles and applications of the derived DNA nanoarchitectures. The advantages and ability of functional DNA nanoarchitectonics to overcome the trivial drawbacks of classical DNA nanotechnology to fulfill realistic and practical applications are highlighted, and an outlook on future developments is presented.

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