Within the frame of this work, the synthesis of silver nanoparticles (Ag NPs) and silver chloride nanoparticles (AgCl NPs) as mediated by microbes has been investigated. The nanoparticles were reduced from a silver nitrate precursor by the presence of bacteria, like Raoultella planticola and Pantoea agglomerans. The results show that the characteristic surface plasmon resonance absorption band occurs at about 440 nm. Nanoparticles were also characterized with the help of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD), which showed the formation of spherical Ag/AgCl NPs with a centered cubic crystal structure and a mean particle size of around 10–50 nm. Assays for antimicrobial activity of the biosynthesized nanoparticles demonstrated meaningful results against microorganisms such as Staphylococcus aureus, Streptococcus pyogenes, Salmonella, and Bacillus amyloliquefaciens. Furthermore, this study shows that the combination of the obtained nanoparticles with standard antibiotics may be useful in the fight against emerging microbial drug resistance.

The article focuses on the creation and the development of the entrepreneurial ecosystem around the innovation clusters. Clusters are believed to have a well-defined strategic approach aimed at boosting businesses’ sustainable development, especially if clusters are centred around small and middle-sized enterprises. Having undertaken a piece of phenomenological qualitative research, we found that large companies were more open to cooperation and sustainability than the small and middle-sized ones, thus initiating and developing innovation clusters around them (particularly in high-technologized industries such as the automotive and Information Technology). Additionally, we highlight that a sustainable entrepreneurial ecosystem is based on strong pillars, of which small companies’ capabilities, including the entrepreneurial ones, are innovation-driven, and place them in the centre of the innovation cluster. This piece of research also provides relevant insights for private and public organisations and policymakers in order to co-create a local innovation and entrepreneurship strategy. Our findings have implications for both cluster literature and the field of entrepreneurship.

The continuous development of modern industries rises the necessity for functionally graded materials. This research starts from the consideration that the incorporation of SiC particles in the molten aluminum alloy can be difficult due to the very low wettability of SiC particles. In order to increase their wettability, SiC particles were covered with a layer of metallic copper. The incorporation of SiC particles into the aluminum alloy mass was performed by centrifugal casting. The secondary hypoeutectic Al-Si alloy used in this study was elaborated within the crucible of a resistors heated furnace. The metallic coating of SiC particles, in addition to the effect of increasing their wettability by molten metal, also has a role in preventing the formation of aluminum carbide in case of heating above 700 °C. A great amount of attention was paid to the parameters used during the centrifugal casting process. The results showed that adjusting the proportion of SiC particles within the composite allows us to obtain values of the thermal expansion coefficient within previously established limits. The present work demonstrates that the coating of SiC particles covered with a thin layer of metallic Cu creates the conditions to easily incorporate them into the molten Al mass, thus obtaining FGMs with controlled properties.

In this paper, we explore and modify the structural, mechanical, and decorative properties of films composed by TiN and Ti (N, C) with a wide range of N₂ gas flow during the deposition in order to be used on orthodontic systems. The films were grown using reactive DC magnetron sputtering from a pure Ti target and customized with C pellets onto Si and stainless steel 316L substrates. The structural properties were studied using X-ray diffraction and scanning electron microscopy, while the mechanical ones were obtained through hardness, elastic modulus, and friction coefficient. Moreover, the wear rate has been measured under an artificial saliva medium to simulate the oral cavity. The color of the films deposited onto stainless steel 316 L substrate was characterized through CIELab color code. Our findings show that the addition of N₂ and C in the Ti matrix improves the mechanical properties of the films. With the increase in the amount of N₂ and C, the hardness reaches a value of 739 HV, higher than the one reported in the literature (600 HV), a low value of the coefficient of elasticity (8.0 GPa), and also a low friction coefficient (0.30). Moreover, with the addition of N₂ and C in the Ti films, the color of the films changes from metallic aspect until “with” gold, which means that our coatings exhibit versatile mechanical and color characteristics to be used in orthodontic wires applications.

The digital environment and the businesses can no longer exist separately; the way in which entrepreneurs adapt to digital environments determines the future of the companies. By aiming to understand Romanian entrepreneurs’ openness and the assets disposed for digitalisation, the authors performed a study which revealed different managerial approaches used in order to achieve digital entrepreneurial sustainability. With exploratory research, they (i) identified the strategic approaches of the businesses within the digital environment, (ii) analysed the importance of strategic objectives and the entrepreneurial vision, (iii) understood the long-term strategies and the costs of digitalisation, and (iv) analysed the future of the business in terms of cyber security. The study highlighted that no Romanian entrepreneur placed digitalisation as an independent objective for its company, showing that companies needed a proper digitalisation strategy correlated to the opportunities and threats of the business environment. Moreover, the Romanian entrepreneurs’ knowledge in cyber security was low even though they were aware that it was imperative to control critical information and develop data security strategy so as to avoid data theft/loss in the company. All the findings favoured conceptualising a new Digital Sustainable Entrepreneurship Model based on owners’ entrepreneurial visions and companies’ strategic objectives alike, a guide-framework to remain competitive in a sustainable, ever-growing market.