Collagen is an insoluble fibrous protein that composes the extracellular matrix in animals. Although collagen has been used as a biomaterial since 1881, the properties and the complex structure of collagen are still extensive study subjects worldwide. In this article, several topics of importance for understanding collagen research are reviewed starting from its historical milestones, followed by the description of the collagen superfamily and its complex structures, with a focus on type I collagen. Subsequently, some of the superior properties of collagen‐based biomaterials, such as biocompatibility, biodegradability, mechanical properties, and cell activities, are pinpointed. These properties make collagen applicable in biomedicine, such as wound healing, tissue engineering, surface coating of medical devices, and skin supplementation. Moreover, some antimicrobial strategies and the general host tissue responses regarding collagen as a biomaterial are presented. Finally, the current status and clinical application of the three‐dimensional (3D) printing techniques for the fabrication of collagen‐based scaffolds and the reconstruction of the human heart's constituents, such as capillary structures or even the entire organ, are discussed. Besides, an overall outlook for the future of this unique biomaterial is provided.

This is a 'preproof' accepted article for Clay Minerals. This version may be subject to change during the production process.

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There has been a recent interest in microfluidics due to their wide application and unique integration of concepts, including physics, materials science, chemistry, microelectronics, and biology. Microfluidic chips can be applied in different fields, particularly in the biomedical sector, such as drug delivery, diagnosis devices, cell culture, and scaffold fabrication. Various materials, including metals, polymers, and ceramics, can be manufactured into microscale chips with channels and chambers. Platforms of any required size, structure, or geometry can be fabricated using a wide range of fabrication techniques, for example, three‐dimensional printing. This manuscript assesses the microfluidic devices starting from their historical development, materials, fabrication methods and challenges, as well as biomedical applications.

BACKGROUND The clay treatment widely utilized to reduce unsaturated components in aromatic stream has a detrimental effect on catalyst lifetime. Due to the short lifetime of commercial clay, a huge number of studies have been carried out to address this problem over the last decade. This study aims to optimize the temperature for longer serviceability of clay by removal of unsaturated aliphatic components from aromatic streams through the adsorption and catalytic properties of clay. A novel process arrangement is introduced by scheduling the reuse of deactivated clay that is discarded after deactivation. RESULTS Results showed that the suitable range of temperature for olefin removal is 155–205 °C, and the optimum temperature with the lowest operational cost was 185 °C, which is then gradually elevated to 205 °C. CONCLUSION The new process arrangements utilize these results and elevate clay's lifetime by almost 3.5 times, leading to an economical solution on an industrial scale. © 2021 Society of Chemical Industry (SCI).