Special Issue "Stimuli-Responsive Nanosystems Based on Polymers and Hybrid Nanoparticles"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 15 March 2021.

Special Issue Editor

Dr. Miroslav Mrlík
Website
Guest Editor
Centre of Polymer Systems, Tomas Bata University in Zlin, Trida T. Bati 5678, 76001, Zlin, Czech Republic
Interests: Electrorheology, Magnetorheology, Light-induced actuation, Smart Systems, Energy Harvesting, Vibration sensing, Polymers, Hybrid nanoparticles

Special Issue Information

Dear Colleagues,

Stimuli-responsive materials attracted a huge attention due to its enormous potential since their physical properties can be tuned as well as controlled by external stimulus. However, such materials have several drawbacks originating from its size and therefore the capability of its final response upon external stimulus possess relatively low performance. Implementation of the nano-sized particles and nano-sized complex systems to this field opened a wide scope of applications due to the enormously improved final nanosystem performance.

Therefore, this special issue is mainly focused on the nanosystems based on the polymer and hybrid nanoparticles those physical properties such as viscosity, stiffness, wettability, shape or dimensions can be tuned by presence of external stimuli. Such external stimuli can be electric or magnetic field, temperature, pH or light. This special issue also covers scope of nanosystems including polymers and hybrid nanoparticles those generate certain electrical output from the dynamic mechanical stimulation (vibrations). Introduction of the nano-sized systems those promoting the significant improvement of the stimuli-responsive capabilities would be beneficial. Due to the fact that this topic of stimuli-responsive systems are under attention of the both classes fundamental and applied research, we welcome submissions of original research papers and reviews papers as well.

Dr. Miroslav Mrlík
Guest Editor

Manuscript Submission Information

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Keywords

  • Hybrid nanoparticles
  • Stimuli-responsive
  • Electrorheology
  • Magnetorheology
  • Temperature-responsive
  • Light-induced actuation
  • Vibration detection

Published Papers (4 papers)

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Research

Open AccessArticle
Effect of Structure of Polymers Grafted from Graphene Oxide on the Compatibility of Particles with a Silicone-Based Environment and the Stimuli-Responsive Capabilities of Their Composites
Nanomaterials 2020, 10(3), 591; https://doi.org/10.3390/nano10030591 - 24 Mar 2020
Abstract
This study reports the utilization of controlled radical polymerization as a tool for controlling the stimuli-responsive capabilities of graphene oxide (GO) based hybrid systems. Various polymer brushes with controlled molecular weight and narrow molecular weight distribution were grafted from the GO surface by [...] Read more.
This study reports the utilization of controlled radical polymerization as a tool for controlling the stimuli-responsive capabilities of graphene oxide (GO) based hybrid systems. Various polymer brushes with controlled molecular weight and narrow molecular weight distribution were grafted from the GO surface by surface-initiated atom transfer radical polymerization (SI-ATRP). The modification of GO with poly(n-butyl methacrylate) (PBMA), poly(glycidyl methacrylate) (PGMA), poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) and poly(methyl methacrylate) (PMMA) was confirmed by thermogravimetric analysis (TGA) coupled with online Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Various grafting densities of GO-based materials were investigated, and conductivity was elucidated using a four-point probe method. Raman shift and XPS were used to confirm the reduction of surface properties of the GO particles during SI-ATRP. The contact angle measurements indicated the changes in the compatibility of GOs with silicone oil, depending on the structure of the grafted polymer chains. The compatibility of the GOs with poly(dimethylsiloxane) was also investigated using steady shear rheology. The tunability of the electrorheological, as well as the photo-actuation capability, was investigated. It was shown that in addition to the modification of conductivity, the dipole moment of the pendant groups of the grafted polymer chains also plays an important role in the electrorheological (ER) performance. The compatibility of the particles with the polymer matrix, and thus proper particles dispersibility, is the most important factor for the photo-actuation efficiency. The plasticizing effect of the GO-polymer hybrid filler also has a crucial impact on the matrix stiffness and thus the ability to reversibly respond to the external light stimulation. Full article
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Open AccessArticle
Renewable Fabric Surface-Initiated ATRP Polymerizations: Towards Mixed Polymer Brushes
Nanomaterials 2020, 10(3), 536; https://doi.org/10.3390/nano10030536 - 17 Mar 2020
Abstract
A totally new approach in the synthesis of mixed polymer brushes tethered on polyamide (PA) surfaces is presented herein. As a proof of concept, two types of homopolymers were synthesized in sequential surface-initiated atom transfer radical polymerization (SI-ATRP) reactions: poly(methyl methacrylate)/poly((2-dimethylamino)ethyl methacrylate) and [...] Read more.
A totally new approach in the synthesis of mixed polymer brushes tethered on polyamide (PA) surfaces is presented herein. As a proof of concept, two types of homopolymers were synthesized in sequential surface-initiated atom transfer radical polymerization (SI-ATRP) reactions: poly(methyl methacrylate)/poly((2-dimethylamino)ethyl methacrylate) and polystyrene /poly((2-dimethylamino)ethyl methacrylate). The ATRP initiator was immobilized on the surface through PA chain-end groups in two subsequent steps, separated by homo-polymerizations. The amount of the PA chains’ end groups available on the modified surface was tuned by the thermal rearrangement of the surface. Full article
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Open AccessArticle
Smart Non-Woven Fiber Mats with Light-Induced Sensing Capability
Nanomaterials 2020, 10(1), 77; https://doi.org/10.3390/nano10010077 - 31 Dec 2019
Cited by 1
Abstract
This article is focused on the facile procedure for 2D graphene oxide (GO) fabrication, utilizing reversible de-activation polymerization approach and therefore enhanced compatibility with surrounding polymer matrix. Such tunable improvement led to a controllable sensing response after irradiation with light. The neat GO [...] Read more.
This article is focused on the facile procedure for 2D graphene oxide (GO) fabrication, utilizing reversible de-activation polymerization approach and therefore enhanced compatibility with surrounding polymer matrix. Such tunable improvement led to a controllable sensing response after irradiation with light. The neat GO as well as surface initiated atom transfer radical polymerization (SI-ATRP) grafted particles were investigated by atomic force microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. To confirm the successful surface reduction, X-ray photoelectron spectroscopy and Raman spectroscopy was utilized. The composites in form of non-woven fiber mats containing ungrafted GO and controllably grafted GO with compact layer of polymer dispersed in poly(vinylidene-co-hexafluoropropylene) were prepared by electrospinning technique and characterized by scanning electron microscopy. Mechanical performance was characterized using dynamic mechanical analysis. Thermal conductivity was employed to confirm that the conducting filler was well-dispersed in the polymer matrix. The presented controllable coating with polymer layer and its impact on the overall performance, especially photo-actuation and subsequent contraction of the material aiming on the sensing applications, was discussed. Full article
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Open AccessCommunication
Bi-Ligand Modification of Nanoparticles: An Effective Tool for Surface-Enhanced Raman Spectrometry in Salinated Environments
Nanomaterials 2019, 9(9), 1259; https://doi.org/10.3390/nano9091259 - 05 Sep 2019
Abstract
Elimination of massive aggregation of nanoparticles in the sample of high ionic strength is a prerequisite for the sensitive analysis through a surface-enhanced Raman spectrometry (SERS). We present a system of silver colloid modification composed of two thiolated modifiers (3-mercaptopropionic acid and thiolated [...] Read more.
Elimination of massive aggregation of nanoparticles in the sample of high ionic strength is a prerequisite for the sensitive analysis through a surface-enhanced Raman spectrometry (SERS). We present a system of silver colloid modification composed of two thiolated modifiers (3-mercaptopropionic acid and thiolated polyethylene glycol) both creating a strong Ag-S bond. At their optimal molar ratio, the polymer acts as a steric barrier preventing direct nanoparticle–nanoparticle interaction, while the low-molecular organic acid creates areas accessible for the analyte molecules. Thus, this approach is an excellent tool for sustaining both the colloidal stability and SERS sensitivity. The functionality of the system was demonstrated on the SERS analysis of myoglobin from a saline solution. The favorable creation of hot spots was achieved by laser-induced sintering. Full article
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