scholarly journals One-, Two-, and Three-Dimensional Self-Assembly of Atomically Precise Metal Nanoclusters

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1105 ◽  
Author(s):  
Ayano Ebina ◽  
Sakiat Hossain ◽  
Hikaru Horihata ◽  
Shuhei Ozaki ◽  
Shun Kato ◽  
...  
Keyword(s):  
Self Assembly ◽  
Fine Particle ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Design Guidelines ◽  
Metal Nanoclusters ◽  
Functional Nanomaterials ◽  
Physical Chemical ◽  
Metal Atoms ◽  
Fine Particle Size

Metal nanoclusters (NCs), which consist of several, to about one hundred, metal atoms, have attracted much attention as functional nanomaterials for use in nanotechnology. Because of their fine particle size, metal NCs exhibit physical/chemical properties and functions different from those of the corresponding bulk metal. In recent years, many techniques to precisely synthesize metal NCs have been developed. However, to apply these metal NCs in devices and as next-generation materials, it is necessary to assemble metal NCs to a size that is easy to handle. Recently, multiple techniques have been developed to form one-, two-, and three-dimensional connected structures (CSs) of metal NCs through self-assembly. Further progress of these techniques will promote the development of nanomaterials that take advantage of the characteristics of metal NCs. This review summarizes previous research on the CSs of metal NCs. We hope that this review will allow readers to obtain a general understanding of the formation and functions of CSs and that the obtained knowledge will help to establish clear design guidelines for fabricating new CSs with desired functions in the future.

scholarly journals Direct Patterning and Spontaneous Self-Assembly of Graphene Oxide via Electrohydrodynamic Jet Printing for Energy Storage and Sensing

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 13 ◽  
Author(s):  
Bin Zhang ◽  
Jaehyun Lee ◽  
Mincheol Kim ◽  
Naeeung Lee ◽  
Hyungdong Lee ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Self Assembly ◽  
High Performance ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Layer By Layer ◽  
Energy Storage Devices ◽  
Laminar Structure ◽  
Jet Printing

The macroscopic assembly of two-dimensional materials into a laminar structure has received considerable attention because it improves both the mechanical and chemical properties of the original materials. However, conventional manufacturing methods have certain limitations in that they require a high temperature process, use toxic solvents, and are considerably time consuming. Here, we present a new system for the self-assembly of layer-by-layer (LBL) graphene oxide (GO) via an electrohydrodynamic (EHD) jet printing technique. During printing, the orientation of GO flakes can be controlled by the velocity distribution of liquid jet and electric field-induced alignment spontaneously. Closely-packed GO patterns with an ordered laminar structure can be rapidly realized using an interfacial assembly process on the substrates. The surface roughness and electrical conductivity of the LBL structure were significantly improved compared with conventional dispensing methods. We further applied this technique to fabricate a reduced graphene oxide (r-GO)-based supercapacitor and a three-dimensional (3D) metallic grid hybrid ammonia sensor. We present the EHD-assisted assembly of laminar r-GO structures as a new platform for preparing high-performance energy storage devices and sensors.

scholarly journals Ethylene glycol assisted three-dimensional floral evolution of BiFeO 3 -based nanostructures with effective magneto-electric response

2020 ◽  
Vol 7 (8) ◽  
pp. 200642
Author(s):  
Syed Kumail Abbas ◽  
Ghulam M. Mustafa ◽  
Murtaza Saleem ◽  
Muhammad Sufyan ◽  
Saira Riaz ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Self Assembly ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Functional Materials ◽  
Bias Field ◽  
Memory Storage ◽  
High Coercivity ◽  
Electric Response ◽  
Ferromagnetic Behaviour

Controlled growth of nanostructures plays a vital role in tuning the physical and chemical properties of functional materials for advanced energy and memory storage devices. Herein, we synthesized hierarchical micro-sized flowers, built by the self-assembly of highly crystalline, two-dimensional nanoplates of Co- and Ni-doped BiFeO 3 , using a simple ethylene glycol-mediated solvothermal method. Pure BiFeO 3 attained scattered one-dimensional nanorods-type morphology having diameter nearly 60 nm. Co-doping of Co and Ni at Fe-site in BiFeO 3 does not destabilize the morphology; rather it generates three-dimensional floral patterns of self-assembled nanoplates. Unsaturated polarization loops obtained for BiFeO 3 confirmed the leakage behaviour of these rhombohedrally distorted cubic perovskites. These loops were then used to determine the energy density of the BiFeO 3 perovskites. Enhanced ferromagnetic behaviour with high coercivity and remanence was observed for these nanoplates. A detailed discussion about the origin of ferromagnetic behaviour based on Goodenough–Kanamori's rule is also a part of this paper. Impedance spectroscopy revealed a true Warburg capacitive behaviour of the synthesized nanoplates. High magneto-electric (ME) coefficient of 27 mV cm −1 Oe −1 at a bias field of −0.2 Oe was observed which confirmed the existence of ME coupling in these nanoplates.

Branched polystyrenes from suspension “Strathclyde” polymerization using a vulcanization accelerator as a chain transfer agent

2019 ◽  
Vol 10 (7) ◽  
pp. 885-890 ◽  
Author(s):  
Haiyang Yong ◽  
Yongpeng Miao ◽  
Sigen A ◽  
Dong Quan ◽  
Alojz Ivankovic ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Branched Polymers ◽  
Chain Transfer Agent ◽  
Molecular Architecture ◽  
Physical Chemical ◽  
A Chain ◽  
Vulcanization Accelerator

Branched polymers exhibit a unique three-dimensional (3D) molecular architecture and distinctive physical/chemical properties, and thus have been applied in a wide variety of fields.

scholarly journals Current Progress in Cross-Linked Peptide Self-Assemblies

2020 ◽  
Vol 21 (20) ◽  
pp. 7577
Author(s):  
Noriyuki Uchida ◽  
Takahiro Muraoka
Keyword(s):  
Self Assembly ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Water Soluble ◽  
Cross Linking ◽  
Physical And Chemical Properties ◽  
Cell Scaffold ◽  
Scaffold Materials ◽  
Physical And Chemical ◽  
And Chemical Properties

Peptide-based fibrous supramolecular assemblies represent an emerging class of biomaterials that can realize various bioactivities and structures. Recently, a variety of peptide fibers with attractive functions have been designed together with the discovery of many peptide-based self-assembly units. Cross-linking of the peptide fibers is a key strategy to improve the functions of these materials. The cross-linking of peptide fibers forming three-dimensional networks in a dispersion can lead to changes in physical and chemical properties. Hydrogelation is a typical change caused by cross-linking, which makes it applicable to biomaterials such as cell scaffold materials. Cross-linking methods, which have been conventionally developed using water-soluble covalent polymers, are also useful in supramolecular peptide fibers. In the case of peptide fibers, unique cross-linking strategies can be designed by taking advantage of the functions of amino acids. This review focuses on the current progress in the design of cross-linked peptide fibers and their applications.

scholarly journals Self-assembly of biopolymer films for UV protection of wood

2021 ◽  
Author(s):  
Kristina Ivana Fabijanic ◽  
Aída Ninfa Salinas López ◽  
Long Pan ◽  
Chi-Yuan Cheng ◽  
Yu Wang ◽  
...  
Keyword(s):  
Free Radical ◽  
Self Assembly ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Free Radical Scavenger ◽  
Radical Scavenger ◽  
Ionic Surfactant ◽  
Reducing Ability ◽  
Alternative Material ◽  
Physical And Chemical

AbstractThere is an increasing need for materials with tunable physical and chemical properties that are relatively non-toxic and efficacious for their intended application. Many wood stains and finishes emit toxic chemicals which may have serious implications to one’s health. A novel alternative material is realized between xanthan gum and Neodol, a non-ionic surfactant. The resulting three-dimensional film is evaluated as a free-radical scavenger for the protection of wood at different ratios. Atomic force microscopy visualizes the topography and quantifies the local nanomechanics, while rheological measurements showcase a shift from viscoelastic material to gel. Electron plasmon resonance confirms the free-radical reducing ability (3.5 times), while liquid chromatography mass spectroscopy quantifies the UV degradation of sinapyl alcohol. This material has potential, not only in coating industries as a safer option, but also in those industries requiring flexibility and tenability, namely for biosensors and anti-inflammatory therapeutics. Graphic abstract

Functional self-assembling polypeptide bionanomaterials

2012 ◽  
Vol 40 (4) ◽  
pp. 629-634 ◽  
Author(s):  
Tibor Doles ◽  
Sabina Božič ◽  
Helena Gradišar ◽  
Roman Jerala
Keyword(s):  
Self Assembly ◽  
Biological Systems ◽  
Three Dimensional ◽  
Coiled Coil ◽  
Chemical Properties ◽  
Building Blocks ◽  
External Signal ◽  
Form Complex ◽  
Cell Factories ◽  
Self Assembling

Bionanotechnology seeks to modify and design new biopolymers and their applications and uses biological systems as cell factories for the production of nanomaterials. Molecular self-assembly as the main organizing principle of biological systems is also the driving force for the assembly of artificial bionanomaterials. Protein domains and peptides are particularly attractive as building blocks because of their ability to form complex three-dimensional assemblies from a combination of at least two oligomerization domains that have the oligomerization state of at least two and three respectively. In the present paper, we review the application of polypeptide-based material for the formation of material with nanometre-scale pores that can be used for the separation. Use of antiparallel coiled-coil dimerization domains introduces the possibility of modulation of pore size and chemical properties. Assembly or disassembly of bionanomaterials can be regulated by an external signal as demonstrated by the coumermycin-induced dimerization of the gyrase B domain which triggers the formation of polypeptide assembly.

Preparation and Properties of Porous Apatite-Wollastonite Bioactive Glass-Ceramic

2007 ◽  
Vol 330-332 ◽  
pp. 169-172 ◽  
Author(s):  
Ming Xue ◽  
Jun Ou ◽  
Da Li Zhou ◽  
Dange Feng ◽  
Wei Zhong Yang ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Stromal Cells ◽  
Glass Ceramic ◽  
Sol Gel ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Polymer Foam ◽  
Physical Chemical ◽  
Sol Gel Process ◽  
Precursor Powders

The porous apatite-wollastonite bioactive glass-ceramic (AW-GG) was made from nano-precursor powders derived from sol-gel process, and shaped by dipping method with polymer foam. The physical-chemical properties, bioactivity and biocompatibility of the materials were studied by means of TG, XRD, SEM, TEM and so on. The bioactivity was investigated in simulated body fluid (SBF) and the biocompatibility was evaluated by co-culturing with marrow stromal cells (MSCs). The result shows that: the particle size of the AW precursor powders is 40~100nm; porous AW GC has three-dimensional pored structure with 300~500um macropores and 2~5um micropores; the materials possess high bioactivity and biocompatibility. Porous AW GC may therefore have great potential application as bone tissue engineering scaffold.

scholarly journals Functionalization of metal nanoclusters for biomedical applications

The Analyst ◽  
2016 ◽  
Vol 141 (11) ◽  
pp. 3126-3140 ◽  
Author(s):  
Xiao-Rong Song ◽  
Nirmal Goswami ◽  
Huang-Hao Yang ◽  
Jianping Xie
Keyword(s):  
Biomedical Applications ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Metal Nanoclusters ◽  
Functional Nanomaterials ◽  
New Class ◽  
Strong Luminescence ◽  
Physical And Chemical ◽  
Homo Lumo ◽  
And Chemical Properties

Metal nanoclusters (NCs) are emerging as a new class of functional nanomaterials in the area of biological sensing, labelling, imaging and therapy due to their unique physical and chemical properties, such as ultrasmall size, HOMO–LUMO transition, strong luminescence together with good photostability and biocompatibility.

scholarly journals Sterilization of Scaffolds of Calcium Phosphates and Bacterial Cellulose for their Use in Tissue Regeneration

2020 ◽  
Vol 11 (3) ◽  
pp. 10089-10098
Keyword(s):  
Ultraviolet Radiation ◽  
Bacterial Cellulose ◽  
Calcium Phosphates ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Dimensional Structure ◽  
Radiation Sterilization ◽  
Steam Sterilization ◽  
Physical Chemical ◽  
Microwave Sterilization

The development of biomaterials for the regeneration of tissues is of great importance, and their demand increases every day, due to the increase of the aging population, the expectation, and quality of life, as well as the increase of the accident rates (traffic and violence). Scaffolds are a three-dimensional structure designed to withstand cellular infiltration, growth, and differentiation in order to improve the development and formation of new tissues. Many biomaterials can be used to make these structures, such as bioceramics and biopolymers. However, few studies have been conducted to evaluate its microbiological contamination and the influence of sterilization methods may have on the structure and properties. The objective of this work was to evaluate different sterilization processes and their influence on the physical-chemical properties of Scaffolds made with calcium phosphate and bacterial cellulose. Three sterilization techniques (steam sterilization, ultraviolet radiation sterilization, and microwave sterilization) were evaluated. The results showed that steam sterilization was effective in eliminating microorganisms. Microwave sterilization significantly reduced the amount of CFU / mL, while ultraviolet radiation sterilization did not show efficacy. Changes in the physical-chemical properties of the Scaffolds evaluated after sterilization was not observed, except a slight darkening in the samples treated by steam sterilization or treated by microwave sterilization due to the presence of sodium alginate in the formulation. It was concluded that the steam sterilization process was the most effective.

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