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Topic Review
Silicon Nitride and Hydrogenated Silicon Nitride Thin Films
Silicon nitride (SiNx) and hydrogenated silicon nitride (SiNx:H) thin films enjoy widespread scientific interest across multiple application fields. Exceptional combination of optical, mechanical, and thermal properties allows for their utilization in several industries, from solar and semiconductor to coated glass production. Historically different types of chemical vapour deposition (CVD), such as plasma enhanced (PE-CVD) or hot wire (HW-CVD) are the most common deposition methods, while physical vapour deposition (PVD), primarily sputtering is also widely used. Besides these fabrication methods, atomic layer deposition (ALD) is an emerging technique due to its ability to control the deposition at atomic level and provide extremely thin SiNx layers. Application of these three deposition methods is compared while special attention is paid to the effect of fabrication method on the properties of SiNx thin films, in particular the optical, mechanical, and thermal properties.
  • 1.7K
  • 23 Dec 2021
Topic Review
Thin Polymer Films on Glass
Thin polymer films play critical roles in various glass industry applications. They have been used as adhesives in automotive and architecture, an anti-fouling coating layer in touch-screen applications, a substrate for organic light emitting diode, and a protective layer for glass packaging.
  • 1.7K
  • 27 Jul 2021
Topic Review
Reduction of Graphene Oxide
Graphene is a single layer of carbon atoms lined up in a hexagonal lattice, and graphite is composed of these multiple layers.
  • 1.7K
  • 27 Apr 2021
Topic Review
Cracks Types and Causes of Laser Cladding Coatings
Laser cladding, a novel surface treatment technology, utilizes a high-energy laser beam to melt diverse alloy compositions and form a specialized alloy-cladding layer on the surface of the substrate to enhance its property. However, it can generate substantial residual stresses during the rapid cooling and heating stages, due to inadequate selection of cladding process parameters and disparities in thermophysical properties between the clad layer and substrate material, leading to the formation of various types of cracks. These cracks can significantly impact the quality and performance of the coating.
  • 1.7K
  • 26 Jun 2023
Topic Review
Application of Plant Waxes in Edible Coatings
Natural waxes are of plant or animal origin. They are resistant to moisture, oxidation, and microbiological decomposition. Plant waxes of commercial and industrial importance are obtained from various plant species and are used to produce cosmetic products, ink, varnishes, luster, candles, pastels, etc. Some of them are used in the composition of some edible coatings applied to various foodstuffs. By using them, the properties and quality of food products are preserved during storage.
  • 1.6K
  • 15 Jun 2023
Topic Review
Fabrication of Metal/Carbon Nanotube Composites by Electrochemical Deposition
Metal/carbon nanotube (CNT) composites are promising functional materials due to the various superior properties of CNTs in addition to the characteristics of metals. Electrochemical deposition can be classified into three types: (1) composite plating by electrodeposition or electroless deposition, (2) metal coating on CNT by electroless deposition, and (3) electrodeposition using CNT templates, such as CNT sheets and CNT yarns. 
  • 1.6K
  • 22 Nov 2021
Topic Review
Application of Nanosheets in Nanomedicine
The term “nanosheets” has been coined recently to describe supported and free-standing “ultrathin film” materials, with thicknesses ranging from a single atomic layer to a few tens of nanometers. Owing to their physicochemical properties and their large surface area with abundant accessible active sites, nanosheets (NSHs) of inorganic materials such as Au, amorphous carbon, graphene, and boron nitride (BN) are considered ideal building blocks or scaffolds for a wide range of applications encompassing electronic and optical devices, membranes, drug delivery systems, and multimodal contrast agents, among others. In the specific case of nanomaterials applied to medicine (nanomedicine), this multidisciplinary field has captured the interest of researchers and engineers from different disciplines.
  • 1.6K
  • 08 Feb 2023
Topic Review
PbS and PbSe in Room-Temperature Infrared Photodetectors
Infrared photodetectors have received much attention for several decades due to their broad applications in the military, science, and daily life. However, for achieving an ideal signal-to-noise ratio and a very fast response, cooling is necessary in those devices, which makes them bulky and costly. The earliest information about lead-based semiconductor materials comes from a patent published in 1904 by Bose, who found and utilized the photovoltaic effect of a crystal of galena. Subsequently, Case carried out his research on thin films of thallous sulfide (Tl2S) in 1917 and 1920. Due to the military needs of infrared information in World War II, Germany developed lead salt (PbS, PbSe and lead telluride (PbTe)) materials vigorously in the 1930s. During that period, different methods for preparing lead salt thin films developed rapidly. Gudden and Kutzscher prepared lead salt films by evaporation and chemical deposition, respectively. Shortly after German scientists firstly studied it, the United States scientists also conducted research on it. Cashman of Northwestern University began work on Tl2S in 1941 and later turned his full attention to the preparation of thin films of PbS, PbSe and PbTe by vacuum evaporation. Among the three typical lead salts used in infrared detectors, PbS and PbSe have been developed and produced to some extent, but PbTe has not been adapted for production and has been gradually phased out.
  • 1.6K
  • 23 May 2022
Topic Review
Carbon Dots
Carbon dots (CDs) are part of the nanocarbon family including quasi-spherical nanoparticles with sizes around 10 nm. They consist of amorphous and crystalline parts, mainly composed of carbon with a fringe spacing of 0.34 nm, which corresponds to the (002) interlayer spacing of graphite. Since their first discovery in 2006, CDs have gained ever-increasing attention due to their fascinating properties like distinctive optical behaviour, tunable emission, different functional groups, good biocompatibility, chemical and photo-stability, low toxicity, and low-cost production. More importantly, CDs properties can be changed by controlling their size, shape, and heteroatom doping and by modifying the surfaces. They are considered promising Green alternatives to traditional fluorescent dyes and have been proposed for different optoelectronic applications such as sensing, bioimaging, fingerprint detection, gene delivery, solar cells, or printing inks
  • 1.6K
  • 08 Mar 2021
Topic Review
Benzil
Benzil (BZ) can be converted almost quantitatively to benzoyl peroxide (BP) in aerated polymer films upon irradiation at >400 nm (i.e., the long-wavelength edge of the n→π* absorption band of BZ, where BP does not absorb).
  • 1.6K
  • 20 Sep 2021
Topic Review
Functionally Graded Thermal Sprayed Coatings
       The manufactured industrial pieces have often the external surfaces being in contact with harsh environment. The turbine blades are submitted to hot gas, the implanted prostheses to body liquids, etc. The protection of these surfaces can be realized using films and coatings. The latters have an important function of rendering the life in service of industrial piece longer, belong however, generally, to another group of materials with very different properties than the piece itself. For example, ceramic coatings are applied frequently on metal and alloys and some intermediate layers should be added between substrate and top coating. This is the concept of "functionally graded coatings" reviewed for the technology of thermal spraying in present entry basing onto paper Appl. Sci. 2020, 10, 5153; doi:10.3390/app10155153. The excerpt of this paper shows the chapters related to the applications of functionally graded coatings and their perspectives of development together with selected cited references.
  • 1.6K
  • 27 Dec 2020
Topic Review
Zinc Coating
Advanced high strength galvanized steel sheet has been one of the dominant materials of modern automotive panels because of its outstanding mechanical properties and corrosion resistance. The zinc coating thickness of hot dip galvanized steel sheet is only about 10–20μm, which is a discarded object on the macro level. However, it is obvious to damage and impact on stamping performance. Therefore, this work takes zinc coating as the research object and builds its mechanical constitutive model based on a nano-indentation test and dimensional analysis theory. We separated the zinc coating from the galvanized steel substrate and constructed a sandwich material model by introducing a cohesive layer to connect the zinc coating and the steel substrate. We obtained the interface binding energy between the zinc coating and the steel substrate through the nano-scratch test. The accuracy of the model is verified by the finite element analysis of hemispherical parts. We used the five-layers element model with 0 thickness cohesive layer to simulate the zinc coating damage of galvanized steel sheet. The hemispherical part drawing experiment is used to verify the feasibility of the finite element analysis results. The results demonstrate that it is more accurate to consider the finite element numerical simulation of the zinc coating, introducing the cohesive element to simulate damage between the coating and the substrate. Drawing depth, stamping force, and the strain of the numerical simulation are closer to the experimental results.
  • 1.6K
  • 01 Nov 2020
Topic Review
The Perovskite Solar Cell
Perovskite, an organic–inorganic hybrid material, tends to be a promising light-harvesting material. PSCs (organic-inorganic perovskite solar cells) are considered a significant breakthrough in photovoltaics and have received great attention. Due to the inherent advantage of perovskite thin films that can be fabricated using simple solution techniques at low temperatures, PSCs are regarded as one of the most important low-cost and mass-production prospects.
  • 1.6K
  • 14 Sep 2022
Topic Review
Joint-Design Strategies for Additive Manufacturing
Here, we aim to assess the current modelling and experimental achievements in the design for additive manufacturing of bonded joints, providing a summary of the current state of the art. To limit its scope, the document is focused only on polymeric additive manufacturing processes. As a result, this work contains a structured collection of the tailoring methods adopted for additively manufactured adherends and adhesives with the aim of maximizing bonded joint performance. 
  • 1.6K
  • 17 Sep 2020
Topic Review
Thermal Barrier Coatings
Thermal barrier coating (TBC) systems have presented an ongoing design issue in bids to improve the lifespan of coatings. A TBC can support an extended lifespan by repairing cracks between interfacial layers during high thermal exposure while at the same time increasing coating thickness. Two deposition techniques, atmospheric plasma spray and water-stabilized plasma spray (WSP), have been distinguished to understand mechanical and thermal performance based on their contrasting torch systems and microstructural characterization.
  • 1.6K
  • 23 Dec 2022
Topic Review
Multilingualism in and out of Films and Stereotypes
Films serve to (re-)create a ‘world’ within the mind of the audience. Additionally, they introduce or reinforce stereotypes portrayed as a reality of the modern world through multiplexity and the strategic use of foreign languages, dialects, and non-native language use, among others. Various concepts of stereotypes can be explored in fiction feature films, especially as film characters are often based on different kinds of stereotypes. Audiovisual texts tend to operate as cultural constructs that reflect and convey certain ideologies within an industry that holds the power to marginalize or belittle voices. Multilingual films highlight the contrasts among and within cultures; hence, they can further exacerbate the marginalization and stereotyping of different cultures and nations, ultimately having damaging effects on society’s perception of different stereotypes, such as race and gender groups, which is shown with the examples from a multilingual film. 
  • 1.5K
  • 07 Aug 2023
Topic Review
Carbon-Coatings Improve Performance of Li-Ion Battery
The development of lithium-ion batteries largely relies on the cathode and anode materials. In particular, the optimization of cathode materials plays an extremely important role in improving the performance of lithium-ion batteries, such as specific capacity or cycling stability. Carbon coating modifying the surface of cathode materials is regarded as an effective strategy that meets the demand of Lithium-ion battery cathodes.
  • 1.5K
  • 12 Jul 2022
Topic Review
Lipid Bilayers on Silicon Substrates
Artificial membranes are models for biological systems that are important for several applications. In the present entry we talk about artificial membranes such as supported lipid bilayers (SLB) and ways to self- assemble them. We mainly focus on the results of a new dry evaporation process in high vacuum, i.e., physical vapor deposition, to make samples of dipalmitoylphosphatidylcholine (DPPC) on silicon substrates. We have characterized the main phase transitions and adhesion of our SLBs using high-resolution ellipsometry and AFM techniques. The finding of this new SLB fabrication approach is relevant for the understanding the interaction of lipid bilayers in contact with surfaces in dry environments, with the aim to develop new kinds of lab-on-chip bionanosensors. This discovery is especially relevant in the context of the viability of organisms covered with lipid bilayer structures. An example of this kind of interaction occurs between bilayer-protected viruses, e.g., corona viruses, and solid surfaces, allowing the virus to stay active during long periods of time. The prolonged stability of SLBs on dry SiO2/Si substrates detected in our research can explain the long-term stability of some viruses deposited or adsorbed on dry surfaces, including the SARS-CoV-2 virus. 
  • 1.5K
  • 03 Nov 2020
Topic Review
Electrospun Nanofiber-Based Membranes for Water Treatment
Electrospun nanofiber-based membranes (ENMs), benefitting from characteristics such as a higher specific surface area, higher porosity, lower thickness, and possession of attracted broad attention, has allowed it to evolve into a promising candidate rapidly. According to the roles of electrospun nanofiber layers, NMs can be divided into two categories: (i) nanofiber layer serving as a selective layer, (ii) nanofiber layer serving as supporting substrate.
  • 1.5K
  • 19 Sep 2022
Topic Review
Chitosan Films Barrier improvement
Chitosan is produced commercialy by deacetylation of chitin (a molecule derivative from glucose, and the second most plentiful natural polysaccharide found on our planet after cellulose) and chitosan films have been studied for food preservation, since they are biocompatible, biodegradable, and bioactive. However, their performance, in terms of water and gases barrier properties, needs to be improved.
  • 1.5K
  • 22 Apr 2021
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