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Advances in Stimuli-Responsive Nanomaterials: 2nd Edition
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Advances in Stimuli-Responsive Nanomaterials: 2nd Edition

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanofabrication and Nanomanufacturing".

Deadline for manuscript submissions: 28 November 2024 | Viewed by 5240

Special Issue Editors

Prof. Dr. Jianguo Guan

E-Mail Website
Guest Editor
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Interests: functional composite materials; metamaterials; micro-/nanorobots; photonic crystals
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Long Ren

E-Mail Website
Guest Editor
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, China
Interests: stimuli-responsive materials; liquid metal; micro-/nanorobots
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue of Nanomaterials on “Advances in Stimuli-Responsive Nanomaterials” aims to capture the latest research in the field of smart nanomaterials. The publications in the previous Special Issue involved a broad range of nanomaterials that can react or respond to external stimuli including metallic nanomaterials, oxides nanoparticles, 2D nanomaterials, inorganic heterogenous nanostructures, and polymer-based nanocomposites. Additionally, it covered their applications in microwave/terahertz-wave absorbers and devices, optical devices, micro- and nanomotors, sensors, catalysis, energy storage, and antimicrobial agents.

We thank all the authors for their contributions and reviewers for their assistance with this Special Issue. To continually stimulate more achievements in this field and highlight the importance of stimuli-responsive nanomaterials in such an exciting field, it is our pleasure to launch a follow-up Special Issue entitled “Advances in Stimuli-Responsive Nanomaterials II”. The main topic of this new-Special Issue is the same as the previous one, focusing on the research and development of smart stimuli-responsive nanomaterials and functional devices. It welcomes both theoretical and experimental approaches, covering aspects from the design and synthesis of novel nanomaterials or nanocomposites with stimuli-responsive properties, characterization, and analysis of the working principle and regulating mechanism of stimuli-responsive activities or performances and the development of new smart devices based on stimuli-responsive nanomaterials. Both reviews and original research articles are welcome.

Prof. Dr. Jianguo Guan
Prof. Dr. Long Ren
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • stimuli-responsive materials
  • smart materials and devices
  • nanomaterials and nanocomposites
  • electro-/magnetorheological fluid
  • micro-/nanomotors
  • metamaterials
  • field responsive photonic crystals
  • ferro-/piezoelectric materials
  • photoelectric and photocatalytic materials
  • responsive polymers

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Published Papers (4 papers)

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Research

14 pages, 7913 KiB  
Article
Modulation of Photocatalytic CO2 Reduction by n–p Codoping Engineering of Single-Atom Catalysts
by Guowei Yin, Chunxiao Zhang, Yundan Liu, Yuping Sun and Xiang Qi
Nanomaterials 2024, 14(14), 1183; https://doi.org/10.3390/nano14141183 - 11 Jul 2024
Viewed by 992
Abstract
Transition metal (TM) single-atom catalysts (SACs) have been widely applied in photocatalytic CO2 reduction. In this work, n–p codoping engineering is introduced to account for the modulation of photocatalytic CO2 reduction on a two-dimensional (2D) bismuth-oxyhalide-based cathode by using [...] Read more.
Transition metal (TM) single-atom catalysts (SACs) have been widely applied in photocatalytic CO2 reduction. In this work, n–p codoping engineering is introduced to account for the modulation of photocatalytic CO2 reduction on a two-dimensional (2D) bismuth-oxyhalide-based cathode by using first-principles calculation. n–p codoping is established via the Coulomb interactions between the negatively charged TM SACs and the positively charged Cl vacancy (VCl) in the dopant–defect pairs. Based on the formation energy of charged defects, neutral dopant–defect pairs for the Fe, Co, and Ni SACs (PTM0) and the −1e charge state of the Cu SAC-based pair (PCu−1) are stable. The electrostatic attraction of the n–p codoping strengthens the stability and solubility of TM SACs by neutralizing the oppositely charged VCl defect and TM dopant. The n–p codoping stabilizes the electron accumulation around the TM SACs. Accumulated electrons modify the d-orbital alignment and shift the d-band center toward the Fermi level, enhancing the reducing capacity of TM SACs based on the d-band theory. Besides the electrostatic attraction of the n–p codoping, the PCu−1 also accumulates additional electrons surrounding Cu SACs and forms a half-occupied dx2−y2 state, which further upshifts the d-band center and improves photocatalytic CO2 reduction. The metastability of Cl multivacancies limits the concentration of the n–p pairs with Cl multivacancies (PTM@nCl (n > 1)). Positively charged centers around the PTM@nCl (n > 1) hinders the CO2 reduction by shielding the charge transfer to the CO2 molecule. Full article
(This article belongs to the Special Issue Advances in Stimuli-Responsive Nanomaterials: 2nd Edition)
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13 pages, 3328 KiB  
Article
Enhanced Thermal Stability of Carbonyl Iron Nanocrystalline Microwave Absorbents by Pinning Grain Boundaries with SiBaFe Alloy Nanoparticles
by Yifan Xu, Zhihong Chen, Ziwen Fu, Yuchen Hu, Yunhao Luo, Wei Li and Jianguo Guan
Nanomaterials 2024, 14(10), 869; https://doi.org/10.3390/nano14100869 - 16 May 2024
Viewed by 1013
Abstract
Nanocrystalline carbonyl iron (CI) particles are promising microwave absorbents at elevated temperature, whereas their excessive grain boundary energy leads to the growth of nanograins and a deterioration in permeability. In this work, we report a strategy to enhance the thermal stability of the [...] Read more.
Nanocrystalline carbonyl iron (CI) particles are promising microwave absorbents at elevated temperature, whereas their excessive grain boundary energy leads to the growth of nanograins and a deterioration in permeability. In this work, we report a strategy to enhance the thermal stability of the grains and microwave absorption of CI particles by doping a SiBaFe alloy. Grain growth was effectively inhibited by the pinning effect of SiBaFe alloy nanoparticles at the grain boundaries. After heat treatment at 600 °C, the grain size of CI particles increased from ~10 nm to 85.1 nm, while that of CI/SiBaFe particles was only 32.0 nm; with the temperature rising to 700 °C, the grain size of CI particles sharply increased to 158.1 nm, while that of CI/SiBaFe particles was only 40.8 nm. Excellent stability in saturation magnetization and microwave absorption was also achieved in CI/SiBaFe particles. After heat treatment at 600 °C, the flaky CI/SiBaFe particles exhibited reflection loss below −10 dB over 7.01~10.11 GHz and a minimum of −14.92 dB when the thickness of their paraffin-based composite was 1.5 mm. We provided a low-cost and efficient kinetic strategy to stabilize the grain size in nanoscale and microwave absorption for nanocrystalline magnetic absorbents working at elevated temperature. Full article
(This article belongs to the Special Issue Advances in Stimuli-Responsive Nanomaterials: 2nd Edition)
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16 pages, 4301 KiB  
Article
The Model Study of Phase-Transitional Magnetic-Driven Micromotors for Sealing Gastric Perforation via Mg-Based Micropower Traction
by Kang Xiong and Leilei Xu
Nanomaterials 2024, 14(10), 865; https://doi.org/10.3390/nano14100865 - 16 May 2024
Viewed by 1217
Abstract
Gastric perforation refers to the complete rupture of the gastric wall, leading to the extravasation of gastric contents into the thoracic cavity or peritoneum. Without timely intervention, the expulsion of gastric contents may culminate in profound discomfort, exacerbating the inflammatory process and potentially [...] Read more.
Gastric perforation refers to the complete rupture of the gastric wall, leading to the extravasation of gastric contents into the thoracic cavity or peritoneum. Without timely intervention, the expulsion of gastric contents may culminate in profound discomfort, exacerbating the inflammatory process and potentially triggering perilous sepsis. In clinical practice, surgical suturing or endoscopic closure procedures are commonly employed. Magnetic-driven microswarms have also been employed for sealing gastrointestinal perforation. However, surgical intervention entails significant risk of bleeding, while endoscopic closure poses risks of inadequate closure and the need for subsequent removal of closure clips. Moreover, the efficacy of microswarms is limited as they merely adhere to the perforated area, and their sealing effect diminishes upon removal of the magnetic field. Herein, we present a Fe&Mg@Lard-Paraffin micromotor (LPM) constructed from a mixture of lard and paraffin coated with magnesium (Mg) microspheres and iron (Fe) nanospheres for sutureless sealing gastric perforations. Under the control of a rotating magnetic field, this micromotor demonstrates precise control over its movement on gastric mucosal folds and accurately targets the gastric perforation area. The phase transition induced by the high-frequency magnetothermal effect causes the micromotor composed of a mixed oil phase of lard and paraffin to change from a solid to a liquid phase. The coated Mg microspheres are subsequently exposed to the acidic gastric acid environment to produce a magnesium protonation reaction, which in turn generates hydrogen (H2) bubble recoil. Through a Mg-based micropower traction, part of the oil phase could be pushed into the gastric perforation, and it would then solidify to seal the gastric perforation area. Experimental results show that this can achieve long-term (>2 h) gastric perforation sealing. This innovative approach holds potential for improving outcomes in gastric perforation management. Full article
(This article belongs to the Special Issue Advances in Stimuli-Responsive Nanomaterials: 2nd Edition)
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12 pages, 2078 KiB  
Article
Strategic Structural Control of Polyserotonin Nanoparticles and Their Application as pH-Responsive Nanomotors
by Junyi Hu, Jingjing Cao, Jinwei Lin and Leilei Xu
Nanomaterials 2024, 14(6), 519; https://doi.org/10.3390/nano14060519 - 14 Mar 2024
Viewed by 1380
Abstract
Serotonin-based nanomaterials have been positioned as promising contenders for constructing multifunctional biomedical nanoplatforms due to notable biocompatibility, advantageous charge properties, and chemical adaptability. The elaborately designed structure and morphology are significant for their applications as functional carriers. In this study, we fabricated anisotropic [...] Read more.
Serotonin-based nanomaterials have been positioned as promising contenders for constructing multifunctional biomedical nanoplatforms due to notable biocompatibility, advantageous charge properties, and chemical adaptability. The elaborately designed structure and morphology are significant for their applications as functional carriers. In this study, we fabricated anisotropic bowl-like mesoporous polyserotonin (PST) nanoparticles with a diameter of approximately 170 nm through nano-emulsion polymerization, employing P123/F127 as a dual-soft template and 1,3,5-trimethylbenzene (TMB) as both pore expander and emulsion template. Their formation can be attributed to the synchronized assembly of P123/F127/TMB, along with the concurrent manifestation of anisotropic nucleation and growth on the TMB emulsion droplet surface. Meanwhile, the morphology of PST nanoparticles can be regulated from sphere- to bowl-like, with a particle size distribution ranging from 432 nm to 100 nm, experiencing a transformation from a dendritic, cylindrical open mesoporous structure to an approximately non-porous structure by altering the reaction parameters. The well-defined mesopores, intrinsic asymmetry, and pH-dependent charge reversal characteristics enable the as-prepared mesoporous bowl-like PST nanoparticles’ potential for constructing responsive biomedical nanomotors through incorporating some catalytic functional materials, 3.5 nm CeO2 nanoenzymes, as a demonstration. The constructed nanomotors demonstrate remarkable autonomous movement capabilities under physiological H2O2 concentrations, even at an extremely low concentration of 0.05 mM, showcasing the 51.58 body length/s velocity. Furthermore, they can also respond to physiological pH values ranging from 4.4 to 7.4, exhibiting reduced mobility with increasing pH. This charge reversal-based responsive nanomotor design utilizing PST nanoparticles holds great promise for advancing the application of nanomotors within complex biological systems. Full article
(This article belongs to the Special Issue Advances in Stimuli-Responsive Nanomaterials: 2nd Edition)
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