Since the beginning of the 20th century, hexavalent chromium derivates have been used to prevent corrosion and to improve the adherence of further coatings on zinc, magnesium, steel and aluminum alloys. Chromium (VI), or hexavalent chromium, is one of the most stable oxidation states of chromium. It very seldom occurs in nature and most hexavalent… Continue reading Sol-gel coatings, a safe alternative to chrome plating
Hydroxyapatite – Ca5(OH)(PO4)3– is a complex phosphate of calcium that has chemical and structural resemblance to bone . Thanks to these properties similar to bone and teeth, hydroxyapatite is commonly used for tissue repair. Hydroxyapatite has been widely used for bone defects reparation in dentistry and orthopedics, tooth replacement, alveolar ridges augmentation or and maxillofacial… Continue reading Sol-gel biomedical applications: Hydroxyapatite, bone repair
Electrospinning technique has been available since the first decades of the 20th century, but its applications to tissue engineering or drug delivery are relatively new. This can be attributed to the recent automatization of the technique and its availability. In the last few years, modern electrospinning devices allow the user to control the parameters with… Continue reading Biomedical applications of electrospinning: Tissue engineering
The use of encapsulated substances has been present in the industry since almost five decades, and is widely used in the pharmaceutical industry for time-release drugs and flavor masking . In this process, the entrapped material –the carrier-, usually a liquid but also solids and gases, can be protected from heat and moisture by the… Continue reading Food industry applications of spray coating
One of the main parameters of the electrospinning process is the nature and viscosity of the solution. In order to obtain homogeneous fibers, the electrospinning fiber material must be carefully chosen. Each electrospinning solution has unique viscosity and characteristics that influence the thickness and aggregation of the fibers. These parameters will influence the application of… Continue reading Electrospinning, what do I spin?
The sol-gel synthesis can be obtained from metallo-organic compounds such as alkoxides used as precursors. Alkoxides with a M(OR)n structure, where M is a metal or a metalloid and R is an alkyl group (R = CH3, C2H5, …). For example, tetraethylorthosilicate (TEOS), Si(OC2H5)4, is commonly used in the sol–gel synthesis of silica and glasses.… Continue reading Sol-gel chemical principles
Spray coating techniques are used to obtain thin films by the formation of fine droplets of the coating solution that are deposited on the substrate. In spray coating devices, pressurized air is used to atomize the liquid flow coming from the syringe into small droplets. These droplets are then deposited on the substrate, where they… Continue reading Ultrasonic spray coating