Crystallization and Assembly-Driven Nanostructures for Energy, Electronics, Environment and Emerging Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 18102

Special Issue Editor

The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
Interests: soft matter microscopy; soft electronics and ionics; AI for healthcare and manufacturing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Self-assembly and crystallization are important processes that govern performance and applications of a wide range of materials and nanomaterials found in nature and in our society. For example, battery materials and organic semiconductors are often crystalline. Nanocomposites and block copolymers often rely on various intra- or intermolecular forces to form nanostructures and nanopatterns. Materials that are found in nature, such as spider silk, shell, bone, and diamond, often utilize crystallization and/or assembly to achieve extraordinary performances. Crystalline or self-assembled nanostructures are playing critical roles in technologies such as sensors, actuators, solar cells, transistors, super capacitors, novel battery designs, solid electrolytes, biomimetic materials, and smart materials. There is an immense interest in the crystal structure, crystallization, hierarchical morphology, nanostructures, nanopatterns, or assembly-driven interfaces and complexes that contribute to the mechanic, ionic, electronic, and other functional behaviors of nanomaterials.

Despite the great progress that has been achieved in the past several decades, active research efforts are underway to harness the principles of these self-assembly and crystallization processes in dealing with our fast-changing environment and society challenges. We wish to see how crystallization or assembly-driven nanostructures can further have an impact on energy conversion, energy transport, and energy storage processes, as well as in various optoelectronic, environmental, and emerging applications. In this Special Issue of Nanomaterials, we wish to gather updates on different aspects of self-assembly and crystallization processes in nanomaterials.

We welcome articles in the form of reviews, short communications, as well as full articles. These include but not limited to: 

  • Theory, simulation, and modeling;
  • Machine learning approach;
  • Fundamental understanding of driving forces;
  • Synthesis of novel materials for self-assembly, crystal-containing multicomponent materials, nanopatterning;
  • Novel processes and technique improvements for optimized assembly and crystalline complexes;
  • New or potential applications;
  • Biomimetic or bio-inspired materials, self -assembled interfaces, and complexes;
  • Novel characterization or in situ observations;
  • Structure–property correlations. 

Dr. Jihua Chen
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

  • crystallization
  • interfaces
  • self-assembly
  • optoelectronics
  • biomimetic materials
  • (Co) polymer
  • organic semiconductor
  • ion transport
  • battery materials

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Published Papers (6 papers)

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Editorial

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2 pages, 148 KiB  
Editorial
Crystallization and Assembly-Driven Nanostructures for Energy, Electronics, Environment, and Emerging Applications
by Jihua Chen
Nanomaterials 2023, 13(4), 637; https://doi.org/10.3390/nano13040637 - 6 Feb 2023
Viewed by 1051
Abstract
This manuscript has been authored by UT-Battelle, LLC, under Contract No [...] Full article

Research

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14 pages, 11333 KiB  
Article
Manufacturing Bulk Nanocrystalline Al-3Mg Components Using Cryomilling and Spark Plasma Sintering
by Amanendra K. Kushwaha, Manoranjan Misra and Pradeep L. Menezes
Nanomaterials 2022, 12(20), 3618; https://doi.org/10.3390/nano12203618 - 15 Oct 2022
Cited by 10 | Viewed by 1881
Abstract
In the current study, pure aluminum (Al) powders were cryomilled with and without 3 wt.% pure magnesium (Mg) dopant for varying durations followed by spark plasma sintering (SPS) of powders to prepare bulk components with superior mechanical properties. The crystallite sizes were determined [...] Read more.
In the current study, pure aluminum (Al) powders were cryomilled with and without 3 wt.% pure magnesium (Mg) dopant for varying durations followed by spark plasma sintering (SPS) of powders to prepare bulk components with superior mechanical properties. The crystallite sizes were determined for powders and the bulk components by analyzing the X-ray diffraction (XRD) spectrum. The calculations indicated a reduction in crystallite size with the increase in the cryomilling duration. The results also showed a more significant decrease in the crystallite sizes for Al-3Mg samples than that of pure Al. The changes in the surface morphology of powders were characterized using scanning electron microscopy (SEM). The elemental mapping analysis at nanoscale was carried out using Energy-dispersive X-ray spectroscopy (EDX) in Scanning transmission electron microscopy (STEM). The mechanical properties of the bulk components were assessed using a Vickers Microhardness tester. The test results demonstrated an improvement in the hardness of Mg-doped components. Higher hardness values were also reported with an increase in the cryomilling duration. This article discusses the mechanisms for the reduction in crystallite size for pure Al and Al-3Mg and its subsequent impact on improving mechanical properties. Full article
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19 pages, 6317 KiB  
Article
Influence of Cryomilling on Crystallite Size of Aluminum Powder and Spark Plasma Sintered Component
by Amanendra K. Kushwaha, Raven Maccione, Merbin John, Sridhar Lanka, Manoranjan Misra and Pradeep L. Menezes
Nanomaterials 2022, 12(3), 551; https://doi.org/10.3390/nano12030551 - 6 Feb 2022
Cited by 13 | Viewed by 2686
Abstract
The present investigation aims to develop nanocrystalline (NC) pure aluminum powders using cryomilling technique and manufacture bulk components using spark plasma sintering (SPS). The cryomilling was performed on pure Al powders for 2, 6, and 8 h. The cryomilled powders were then consolidated [...] Read more.
The present investigation aims to develop nanocrystalline (NC) pure aluminum powders using cryomilling technique and manufacture bulk components using spark plasma sintering (SPS). The cryomilling was performed on pure Al powders for 2, 6, and 8 h. The cryomilled powders were then consolidated using SPS to produce bulk components. The particle morphology and crystallite size of the powders and the bulk SPS components were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that the crystallite size of pure Al powders decreases with increased cryomilling time. The results also showed that the SPS at elevated temperatures resulted in a slight increase in crystallite size, however, the changes were insignificant. The mechanical properties of the bulk components were determined using a Vickers microhardness tester. The hardness of the cryomilled SPS component was determined to be three times higher than that of the unmilled SPS component. The mechanism for the reduction in crystallite size with increasing cryomilling time is discussed. This fundamental study provides an insight into the development of bulk nanomaterials with superior mechanical properties for automotive, aerospace, marine, and nuclear applications. Full article
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13 pages, 2360 KiB  
Article
Cytochalasin B Treatment and Osmotic Pressure Enhance the Production of Extracellular Vesicles (EVs) with Improved Drug Loading Capacity
by Ashita Nair, Jiyoon Bu, Piper A. Rawding, Steven C. Do, Hangpeng Li and Seungpyo Hong
Nanomaterials 2022, 12(1), 3; https://doi.org/10.3390/nano12010003 - 21 Dec 2021
Cited by 13 | Viewed by 3851
Abstract
Extracellular vesicles (EVs) have been highlighted as novel drug carriers due to their unique structural properties and intrinsic features, including high stability, biocompatibility, and cell-targeting properties. Although many efforts have been made to harness these features to develop a clinically effective EV-based therapeutic [...] Read more.
Extracellular vesicles (EVs) have been highlighted as novel drug carriers due to their unique structural properties and intrinsic features, including high stability, biocompatibility, and cell-targeting properties. Although many efforts have been made to harness these features to develop a clinically effective EV-based therapeutic system, the clinical translation of EV-based nano-drugs is hindered by their low yield and loading capacity. Herein, we present an engineering strategy that enables upscaled EV production with increased loading capacity through the secretion of EVs from cells via cytochalasin-B (CB) treatment and reduction of EV intravesicular contents through hypo-osmotic stimulation. CB (10 µg/mL) promotes cells to extrude EVs, producing ~three-fold more particles than through natural EV secretion. When CB is induced in hypotonic conditions (223 mOsm/kg), the produced EVs (hypo-CIMVs) exhibit ~68% less intravesicular protein, giving 3.4-fold enhanced drug loading capacity compared to naturally secreted EVs. By loading doxorubicin (DOX) into hypo-CIMVs, we found that hypo-CIMVs efficiently deliver their drug cargos to their target and induce up to ~1.5-fold more cell death than the free DOX. Thus, our EV engineering offers the potential for leveraging EVs as an effective drug delivery vehicle for cancer treatment. Full article
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Review

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31 pages, 8262 KiB  
Review
Ultrasonic Nanocrystal Surface Modification: Processes, Characterization, Properties, and Applications
by Akhil Kishore, Merbin John, Alessandro M. Ralls, Subin Antony Jose, Udaya Bhat Kuruveri and Pradeep L. Menezes
Nanomaterials 2022, 12(9), 1415; https://doi.org/10.3390/nano12091415 - 20 Apr 2022
Cited by 26 | Viewed by 4249
Abstract
Ultrasonic nanocrystal surface modification (UNSM) is a unique, mechanical, impact-based surface severe plastic deformation (S2PD) method. This newly developed technique finds diverse applications in the aerospace, automotive, nuclear, biomedical, and chemical industries. The severe plastic deformation (SPD) during UNSM can generate [...] Read more.
Ultrasonic nanocrystal surface modification (UNSM) is a unique, mechanical, impact-based surface severe plastic deformation (S2PD) method. This newly developed technique finds diverse applications in the aerospace, automotive, nuclear, biomedical, and chemical industries. The severe plastic deformation (SPD) during UNSM can generate gradient nanostructured surface (GNS) layers with remarkable mechanical properties. This review paper elucidates the current state-of-the-art UNSM technique on a broad range of engineering materials. This review also summarizes the effect of UNSM on different mechanical properties, such as fatigue, wear, and corrosion resistance. Furthermore, the effect of USNM on microstructure development and grain refinement is discussed. Finally, this study explores the applications of the UNSM process. Full article
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25 pages, 10231 KiB  
Review
Advanced Electron Microscopy of Nanophased Synthetic Polymers and Soft Complexes for Energy and Medicine Applications
by Jihua Chen
Nanomaterials 2021, 11(9), 2405; https://doi.org/10.3390/nano11092405 - 15 Sep 2021
Cited by 11 | Viewed by 3336
Abstract
After decades of developments, electron microscopy has become a powerful and irreplaceable tool in understanding the ionic, electrical, mechanical, chemical, and other functional performances of next-generation polymers and soft complexes. The recent progress in electron microscopy of nanostructured polymers and soft assemblies is [...] Read more.
After decades of developments, electron microscopy has become a powerful and irreplaceable tool in understanding the ionic, electrical, mechanical, chemical, and other functional performances of next-generation polymers and soft complexes. The recent progress in electron microscopy of nanostructured polymers and soft assemblies is important for applications in many different fields, including, but not limited to, mesoporous and nanoporous materials, absorbents, membranes, solid electrolytes, battery electrodes, ion- and electron-transporting materials, organic semiconductors, soft robotics, optoelectronic devices, biomass, soft magnetic materials, and pharmaceutical drug design. For synthetic polymers and soft complexes, there are four main characteristics that differentiate them from their inorganic or biomacromolecular counterparts in electron microscopy studies: (1) lower contrast, (2) abundance of light elements, (3) polydispersity or nanomorphological variations, and (4) large changes induced by electron beams. Since 2011, the Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National Laboratory has been working with numerous facility users on nanostructured polymer composites, block copolymers, polymer brushes, conjugated molecules, organic–inorganic hybrid nanomaterials, organic–inorganic interfaces, organic crystals, and other soft complexes. This review crystalizes some of the essential challenges, successes, failures, and techniques during the process in the past ten years. It also presents some outlooks and future expectations on the basis of these works at the intersection of electron microscopy, soft matter, and artificial intelligence. Machine learning is expected to automate and facilitate image processing and information extraction of polymer and soft hybrid nanostructures in aspects such as dose-controlled imaging and structure analysis. Full article
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