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Topic Review
Graphene-Based Nanomaterials in Environmental Analysis
Sample preparation is an essential and preliminary procedure of most chemical analyses. Due to the sample diversity, the selection of appropriate adsorbents for the effective preparation and separation of different samples turned out to be important for the methods. By exploiting the rapid development of material science, some novel adsorption materials, especially graphene-based nanomaterials, have shown supremacy in sample pretreatment. In this review, a discussion between these nanomaterials will be made, as well as some basic information about their synthesis. The focus will be on the different environmental applications that use these materials.
  • 1.4K
  • 11 May 2021
Topic Review
Phosphorus Dendrimers for the Synthesis of Metal Nanoparticles
Nanoparticles are defined as matter that has at least one dimension between 1 and 100 nm, and that generally has different properties from its bulk. Phosphorus dendrimers are hyperbranched macromolecules synthesized step-by-step, bearing a phosphorus atom at each branching point. Such type of dendrimers are suitable for the synthesis of diverse types of metal nanoparticles from organometallic precursors.
  • 1.4K
  • 21 Aug 2023
Topic Review
Boron Nitride Materials
Boron nitride 2D materials are characterized by several defects which affect their optical properties. A better in-sight of the structure is achieved by theoretical calculations which have been used to investigate the boron-nitride defects and their functionalization on the atomic scale. A brief overview of the main theoretical models used to describe the defects-properties relationship is given in the present entry.
  • 1.4K
  • 26 Oct 2020
Topic Review
2D Materials in Ultrafast Lasers
Ultrafast lasers are the key component of ultrafast photonics, which have come into practice in various fields, such as micromachining, communication, medical procedures, gas detection, and remote sensing. With the advantages of stability, compactness, and easy implementation, mode-locking and Q-switching are two notable techniques to achieve ultrafast pulsed lasers, where SAs perform crucial roles in many types of ultrafast lasers, such as fiber, solid-state, and waveguide lasers.
  • 1.4K
  • 25 Aug 2021
Topic Review
Dendrimer Nanodevices and Gallic Acid
Human neuroblastoma (NB), a pediatric tumor inclined to relapse, after an initial response to therapy, usually develops resistance. Since several chemotherapeutics, including the weel known etoposide (ETO), exert anticancer effect by increasing reactive oxygen species (ROS), NB cells overproduce antioxidant compounds becoming drugs-resistant. Moreover, ETO, although widely used, suffers from fast metabolism, poor solubility and systemic toxicity, that limit its administration dosage and its therapeutic efficiency. An appealing strategy to sensitize NB cells to chemotherapy involves the use of less toxic natural compounds able to reduce antioxidant defenses of NB cells and to induce ROS overproduction. In this contest, although affected by several issues as instability and poor absorbability, antioxidant/pro-oxidant polyphenols, such as gallic acid (GA), showed pro-oxidant anti-cancer effects and low toxicity for healthy cells, in several kind of tumors, not including NB. Herein, for the first time, free GA, two GA-dendrimers, and the dendrimer adopted as GA reservoir were tested on both sensitive and chemoresistant NB cells. Furthermore, the dendrimer adopted as carrier for GA was exploited also for entrapping and protecting ETO and for enhancing its solubility and effectiveness.The dendrimer device induced ROS-mediated death both in sensitive NB cells and also in chemoresistant ones. Free GA proved a dose-dependent ROS-mediated cytotoxicity on both cell populations. Intriguingly, when administered in dendrimer formulations at a dose not cytotoxic for NB cells, GA nullified any pro-oxidant activity of dendrimer. Unfortunately, due to GA, nanoformulations were inactive on NB cells, but GA resized in nanoparticles showed considerable ability in counteracting, at low dose, ROS production and oxidative stress, herein induced by the dendrimer. Interestingly, the ETO-dendrimer showed a synergistic action, controlled released over time with a significantly improved drug bioactivity, representing a novel biodegradable and promising device for the delivery of ETO into NB cells.
  • 1.4K
  • 12 Jan 2021
Topic Review
Properties of Hybrid Perovskite and Polymer Materials
The aim of this work is to investigate the preparation, the optical properties and the stability over time of a colloidal oraganic-inorganic hybrid perovskite (CH3NH3PbBr3)/random copolymer P(MMA-co-DMAEMA) system. Different ratios of perovskite to copolymer were used to study its effect on stability and properties. The optical properties were investigated by UV-Vis and Fluorescence Spectroscopy. Dynamic light scattering was used to determine the size, and the polydispersity of the colloidal hybrid particles; while morphology was investigated by transmission electron microscopy. Photoluminescence decay studies revealed the interaction of the random copolymer with the perovskite. Finally, thin-films were prepared to investigate the optical properties of thin hybrid films was observed under certain conditions.
  • 1.4K
  • 30 Nov 2021
Topic Review
Thermal Characterization of Low-Dimensional Materials
Heat dissipation and thermal management are central challenges in various areas of science and technology and are critical issues for the majority of nanoelectronic devices. In this review, we focus on experimental advances in thermal characterization and phonon engineering that have drastically increased the understanding of heat transport and demonstrated efficient ways to control heat propagation in nanomaterials.
  • 1.4K
  • 02 Feb 2021
Topic Review
Multiplexed Nanobiosensors
Nanobiosensors are sensors in which various nanosize materials are used, however, large equipment is still required for whole sensing systems, because they are not, by themselves, able to detect nanoscale events. The current state-of-the-art nanobiosensors are based on several diagnostic methods, such as enzyme-linked immunosorbent assay (ELISA), flow cytometric immunoassay, electrochemical (amperometric, voltammetric and impedance), immunoassay, mass spectrometric immunoassay, chromatographic immunoassay, and different optical immunoassays. Contemporary multiplexed nanobiosensors are developed for the detection and quantification of clinically relevant analytes in biological and clinical samples (i.e., blood, urine, and saliva).
  • 1.4K
  • 23 Jun 2021
Topic Review
Geopolymer Nanocomposites
Geopolymers belong to the group of the fastest-growing polymeric materials. The interest in these inorganic ceramic materials is constantly growing. This is a result of their properties, including acid resistance, porosity, low drying shrinkage, as well as high strength, due to which geopolymers are widely investigated for potential application in the construction industry (e.g., repairing roads, bridges, or other infrastructure). The range of potential applications of geopolymers can be increased by improving the properties of the components.
  • 1.4K
  • 08 May 2023
Topic Review
Gold Nanoparticles for Multidrug-Resistant Bacteria
The field of medical nanotechnology has emerged as an innovative and a powerful tool for treating some of the most complicated health conditions. Different inorganic nanomaterials including gold, silver, and others have showed potential antibacterial efficacies. Interestingly, gold nanoparticles (AuNPs) have gained specific attention, due to their biocompatibility, ease of surface functionalization, and their optical properties.
  • 1.4K
  • 22 Feb 2021
Topic Review
Solid State NMR Spectroscopy
Solid-state NMR relaxometry has established its position in food science, including the determination of moisture content, solid fat content and much more and shown to be complementary to traditional microscopic techniques in studying the phase morphology of blended materials used in semiconductive polymer-based devices .
  • 1.4K
  • 02 Jul 2021
Topic Review
Renal Nanomedicine
The kidneys are vital organs performing several essential functions. Their primary function is the filtration of blood and the removal of metabolic waste products as well as fluid homeostasis. Renal filtration is the main pathway for drug removal, highlighting the importance of this organ to the growing field of nanomedicine. The kidneys (i) have a key role in the transport and clearance of nanoparticles (NPs), (ii) are exposed to potential NPs’ toxicity, and (iii) are the targets of diseases that nanomedicine can study, detect, and treat. 
  • 1.4K
  • 12 Aug 2021
Topic Review
Halloysite Nanofluids
Nanofluids obtained from halloysite and de-ionized water (DI) were prepared by using surfactants and changing pH for heat-transfer applications. The halloysite nanotubes (HNTs) nanofluids were studied for several volume fractions (0.5, 1.0, and 1.5 vol%) and temperatures (20, 30, 40, 50, and 60 °C). 
  • 1.4K
  • 20 Feb 2021
Topic Review
Polymer–Lipid Pharmaceutical Nanocarriers
Some issues in pharmaceutical therapies such as instability, poor membrane permeability, and bi-oavailability of drugs can be solved by the design of suitable delivery systems based on the com-bination of two pillar classes of ingredients: polymers and lipids. At the same time, modern tech-nologies are required to overcome production limitations (low productivity, high energy con-sumption, expensive setup, long process times) to pass at the industrial level.
  • 1.4K
  • 19 Feb 2021
Topic Review
HER2-Positive Breast Cancer Targeted Therapies
Breast cancer represents the most common cancer type and one of the major leading causes of death in the female worldwide population. Overexpression of human epidermal growth factor (HER2), a transmembrane glycoprotein related to the epidermal growth factor receptor, results in a biologically and clinically aggressive breast cancer subtype. It is also the primary driver for tumor detection and progression and, in addition to being an important prognostic factor in women diagnosed with breast cancer, HER2 is a widely known therapeutic target for drug development. In breast cancer, the overexpression of the HER2 receptor makes it a reliable biomarker and a successful therapeutic target. Several strategies have been developed to target HER2, using various targeting molecules including monoclonal antibodies and tyrosine kinase inhibitors, antibody–drug conjugates, small molecules, and peptides.
  • 1.4K
  • 12 Sep 2023
Topic Review
Nanofiber-Based Face Masks and Respirators
Wearing face masks, use of respirators, social distancing, and practicing personal hygiene are all measures to prevent the spread of coronavirus disease (COVID-19). This pandemic has revealed the deficiency of face masks and respirators across the world. Therefore, significant efforts are needed to develop air filtration and purification technologies, as well as innovative, alternative antibacterial and antiviral treatment methods. It has become urgent—in order for humankind to have a sustainable future—to provide a feasible solution to air pollution, particularly to capture fine inhalable particulate matter in the air.
  • 1.3K
  • 24 Aug 2021
Topic Review
Two-Dimensional Materials for Optoelectronics Applications
The past one and a half decades have witnessed the tremendous progress of two-dimensional (2D) crystals, including graphene, transition-metal dichalcogenides, black phosphorus, MXenes, hexagonal boron nitride, etc., in a variety of fields. The key to their success is their unique structural, electrical, mechanical and optical properties. Two-dimensional materials are layered crystalline solids that have strong bonding in the crystal plane, while the forces between the adjacent atomic layers are weak van-der-Waals forces. The special structure of 2D materials endows them with many remarkable abilities.
  • 1.3K
  • 12 Aug 2022
Topic Review
Electrohydrodynamic Atomization
Electrohydrodynamic atomization, which comprises electrospray and electrospinning, is a physical process induced by an external electric field. The setup of EHDA is relatively simple, consisting of a high-voltage source (positive or negative) that provides external electrical energy and a precursor feeding source mounted with a metal capillary nozzle facing a conductive collector. Although EHDA can be operated in an atmospheric environment, the setup is usually placed in a fume hood with good electrical isolation and ventilation to ensure safety while maintaining the temperature and relative humidity of the workspace.
  • 1.3K
  • 19 Apr 2022
Topic Review
Chinese Herb-Synthesized Silver Nanoparticles by Phytonanotechnology
Biologically synthesized silver nanoparticles (AgNPs) are potential antimicrobial agents commonly used in clinical treatment, such as wound dressing, topical ointments and anticancer agents. Recently, AgNPs with leaf and root extract ofPanax ginsenghave been successfully synthesized and showed potential antimicrobial activity. Different parts of Chinese herbs, including leaves, stenches, roots, and fruit extract, are widely applied for curing diseases.
  • 1.3K
  • 29 Mar 2022
Topic Review
Plasmonic Biosensors for Single-molecule Detection
Plasmonic biosensing has enabled the design of novel detection strategies capable of targeting individual molecules while evaluating their binding affinity and biological interactions.
  • 1.3K
  • 22 Apr 2021
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