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Nanomaterials
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Advanced Studies in Colloidal Nano-Matters and Materials
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Advanced Studies in Colloidal Nano-Matters and Materials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanocomposite Materials".

Deadline for manuscript submissions: closed (25 October 2022) | Viewed by 11486

Special Issue Editors

Dr. Aurica P. Chiriac

E-Mail Website
Guest Editor
“Petru Poni” Institute of Macromolecular Chemistry of the Romanian Academy, Grigore Ghica Voda Alley, No. 41 A, 700487 Iasi, Romania
Interests: biomaterials; drug delivery systems
Special Issues, Collections and Topics in MDPI journals
Dr. Loredana Elena Niţə

E-Mail Website
Guest Editor
“Petru Poni” Macromolecular Chemistry Institute, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
Interests: polymers synthesis, including by nonconventional methods; chemical modifications; hydrogels; polymeric matrices for bioapplications; nanoparticles; nanotechnology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanomaterials, recognized by their tiny size, measured in nanometers, are of special interest due to their tunable physicochemical and biological properties with enhanced performance compared with those of their individual counterparts. These improvements induce and ensure the extension of their field of applications. As a result, multiple research studies have been dedicated to the design, synthesis, characterization, and applications of nanomaterials and have consequently developed investigations on issues related to toxicity and risk assessment of the use of these compounds in the environment. Nanomaterials and colloidal nanoparticles, which can be synthesized with variable morphologies and functionalities, represent a wide field of research both in terms of obtaining methods and also of the possibilities of using the resulting structures. In this context, the aim of this Special Issue on “Advanced Studies in Colloidal Nanomatters and Materials of Nanomaterials” is to gather papers addressing state-of-the-art trends, future directions, and challenges in the synthesis and development of formulations based on colloidal nanomaterials, as well their applicability, which in principle results and is derived from the nanoscale of these systems. Original research papers, communications, review articles, and opinions are welcome.

Dr. Aurica P. Chiriac
Dr. Loredana Elena Niţə
Guest Editors

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Keywords

  • colloidal nanomaterial synthesis and characterization
  • engineering colloidal nanoparticles
  • colloidal nanomaterials as active compounds
  • colloidal nanoparticles as pharmaceutical agents
  • polymer-based nanoparticles for biomedical applications
  • advances in nanoparticle surface modifications
  • challenges and opportunities in colloidal nanoparticle use

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Published Papers (5 papers)

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Research

7 pages, 635 KiB  
Communication
Formation of Iron (Hydr)Oxide Nanoparticles with a pH-Clock
by Ronny Kürsteiner, Yong Ding, Maximilian Ritter and Guido Panzarasa
Nanomaterials 2022, 12(21), 3743; https://doi.org/10.3390/nano12213743 - 25 Oct 2022
Cited by 3 | Viewed by 1774
Abstract
We demonstrate the autonomous synthesis of iron (hydr)oxide (green rust, magnetite, and lepidocrocite) nanoparticles by precipitating iron(II) ions using hydroxide ions generated in situ with the methylene glycol-sulfite (MGS) reaction, a pH-clock. We show that the nature of the products can be predetermined [...] Read more.
We demonstrate the autonomous synthesis of iron (hydr)oxide (green rust, magnetite, and lepidocrocite) nanoparticles by precipitating iron(II) ions using hydroxide ions generated in situ with the methylene glycol-sulfite (MGS) reaction, a pH-clock. We show that the nature of the products can be predetermined by tuning the initial iron(II) concentration. Full article
(This article belongs to the Special Issue Advanced Studies in Colloidal Nano-Matters and Materials)
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18 pages, 3734 KiB  
Article
Quantum-Dot-Based Iron Oxide Nanoparticles Activate the NLRP3 Inflammasome in Murine Bone Marrow-Derived Dendritic Cells
by Fernando Menegatti de Melo, Karine Kawasaki, Tarciso Almeida Sellani, Bruno Souza Bonifácio, Renato Arruda Mortara, Henrique Eisi Toma, Filipe Menegatti de Melo and Elaine Guadelupe Rodrigues
Nanomaterials 2022, 12(18), 3145; https://doi.org/10.3390/nano12183145 - 10 Sep 2022
Cited by 1 | Viewed by 2143
Abstract
Inflammasomes are cytosolic complexes composed of a Nod-like receptor, NLR, the adaptor protein, ASC, and a proteolytic enzyme, caspase-1. Inflammasome activation leads to caspase-1 activation and promotes functional maturation of IL-1β and IL-18, two prototypical inflammatory cytokines. Besides, inflammasome activation leads to pyroptosis, [...] Read more.
Inflammasomes are cytosolic complexes composed of a Nod-like receptor, NLR, the adaptor protein, ASC, and a proteolytic enzyme, caspase-1. Inflammasome activation leads to caspase-1 activation and promotes functional maturation of IL-1β and IL-18, two prototypical inflammatory cytokines. Besides, inflammasome activation leads to pyroptosis, an inflammatory type of cell death. Inflammasomes are vital for the host to cope with foreign pathogens or tissue damage. Herein, we show that quantum-dot-based iron oxide nanoparticles, MNP@QD, trigger NLRP3 inflammasome activation and subsequent release of proinflammatory interleukin IL-1β by murine bone marrow-derived dendritic cells (BMDCs). This activation is more pronounced if these cells endocytose the nanoparticles before receiving inflammatory stimulation. MNP@QD was characterized by using imaging techniques like transmission electron microscopy, fluorescence microscopy, and atomic force microscopy, as well as physical and spectroscopical techniques such as fluorescence spectroscopy and powder diffraction. These findings may open the possibility of using the composite MNP@QD as both an imaging and a therapeutic tool. Full article
(This article belongs to the Special Issue Advanced Studies in Colloidal Nano-Matters and Materials)
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Graphical abstract

14 pages, 3703 KiB  
Article
Determination of the Concentration of Silver Atoms in Hydrosol Nanoparticles
by Evgeny Abkhalimov, Vadim Ershov and Boris Ershov
Nanomaterials 2022, 12(18), 3091; https://doi.org/10.3390/nano12183091 - 6 Sep 2022
Cited by 4 | Viewed by 2200
Abstract
In this work, we propose a new method for determining the concentration of silver atoms in hydrosols of nanoparticles (NPs) stabilized with various capping agents. The proposed method is based on the determination of IBT absorption in the UV region (a broad band [...] Read more.
In this work, we propose a new method for determining the concentration of silver atoms in hydrosols of nanoparticles (NPs) stabilized with various capping agents. The proposed method is based on the determination of IBT absorption in the UV region (a broad band with a weakly pronounced shoulder at ~250 nm). To determine the extinction coefficient at 250 nm, we synthesized silver nanoparticles with average sizes of 5, 10, and 25 nm, respectively. The prepared nanoparticles were characterized by TEM, HRTEM, electron diffraction, XRD, DLS, and UV–Vis spectroscopy. It has been shown that the absorption characteristics of spherical NPs are not significantly influenced by the hydrosol preparation method and the type of stabilizer used. For particles with a size of 5–25 nm, the molar extinction coefficient of Ag0 atoms was found to be equal to 3500 ± 100 L mol−1 cm−1 at a wavelength of 250 nm. The results of the theoretical calculations of the molar extinction coefficients for spherical nanoparticles are in good agreement with the experimental values. ICP-MS analysis confirmed the applicability of this method in the concentration range of 5 × 10−7–1 × 10−4 mol L−1. Full article
(This article belongs to the Special Issue Advanced Studies in Colloidal Nano-Matters and Materials)
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Graphical abstract

16 pages, 3534 KiB  
Article
Carbon Dots Embedded Hybrid Microgel with Phenylboronic Acid as Monomer for Fluorescent Glucose Sensing and Glucose-Triggered Insulin Release at Physiological pH
by Jinhua Zhu, Wei Liu, Bowen Zhang, Danyang Zhou, Xiangze Fan, Xiaoge Wang and Xiuhua Liu
Nanomaterials 2022, 12(17), 3065; https://doi.org/10.3390/nano12173065 - 3 Sep 2022
Cited by 5 | Viewed by 2709
Abstract
A multifunctional and biocompatible hybrid microgel (poly(VPBA-AAm)-CD) using N, S-doped carbon dots (CDs) and ethylene glycol dimethacrylate (EGDMA) as cross-linking agents, and 4-vinylbenzene boronic acid (VPBA) and acrylamide (AAm) as monomers, was designed in this work. This microgel can be easily prepared by [...] Read more.
A multifunctional and biocompatible hybrid microgel (poly(VPBA-AAm)-CD) using N, S-doped carbon dots (CDs) and ethylene glycol dimethacrylate (EGDMA) as cross-linking agents, and 4-vinylbenzene boronic acid (VPBA) and acrylamide (AAm) as monomers, was designed in this work. This microgel can be easily prepared by a simple one-pot radical dispersion polymerization of the reactants using a rationally designed hydrogen-bonded complex method. The hybrid microgels were spherical particles with a smooth surface and an average particle size of 234 ± 8 nm. The poly(VPBA-AAm)-CD microgel displayed the glucose-responsive swelling within a clinically concerned range at a physiological pH and could realize the controllable release of insulin. In addition, the release rate of insulin in the hybrid microgel (poly(VPBA-AAm)-CD) could be triggered by glucose concentrations in the solution, and the increasing glucose concentrations can accelerate the insulin release. Further in vitro cytotoxicity studies showed that the microgel had good biocompatibility and no obvious toxicity to the cells. These indicate that the prepared microgel (poly(VPBA-AAm)-CD) may supply a new pattern for the self-regulating therapy of insulin deficiency in diabetes. Full article
(This article belongs to the Special Issue Advanced Studies in Colloidal Nano-Matters and Materials)
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Graphical abstract

11 pages, 6519 KiB  
Article
New Cryogels Based on Poly(vinyl alcohol) and a Copolymacrolactone System: I-Synthesis and Characterization
by Bianca-Elena-Beatrice Crețu, Loredana Elena Nita, Alexandru-Mihail Șerban, Alina Gabriela Rusu, Florica Doroftei and Aurica P. Chiriac
Nanomaterials 2022, 12(14), 2420; https://doi.org/10.3390/nano12142420 - 14 Jul 2022
Cited by 6 | Viewed by 1787
Abstract
Physical cryogels were obtained using the successive freeze–thaw technique of poly(vinyl alcohol) (PVA)/poly(ethylene brassylate-co-squaric acid) (PEBSA) solutions. The cryogel systems were prepared by using two different molecular weights of PVA and PEBSA with three different ratios between the ethylene brassylate (EB) and squaric [...] Read more.
Physical cryogels were obtained using the successive freeze–thaw technique of poly(vinyl alcohol) (PVA)/poly(ethylene brassylate-co-squaric acid) (PEBSA) solutions. The cryogel systems were prepared by using two different molecular weights of PVA and PEBSA with three different ratios between the ethylene brassylate (EB) and squaric acid (SA) comonomers. The presence of interactions, the thermal properties and the morphology were investigated using Fourier Transform Infrared Spectroscopy (FT-IR), thermogravimetry (TGA and DTG) and scanning electron microscopy (SEM), respectively. The influence of the composition on the degree of swelling in a physiological environment was demonstrated. The study highlighted improvements in terms of new network flexibility due to the intermolecular chains interactions brought by the introduction of PEBSA in the cryogel structure. We also concluded that the presence of PEBSA in the PVA/PEBSA cryogel network improved the loading capacity of the new system with specific hydrophobic agents, for example essential oils, which (due to their antimicrobial character) can lead to the use of new systems obtained for various applications. Full article
(This article belongs to the Special Issue Advanced Studies in Colloidal Nano-Matters and Materials)
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