Electrospinning fibers: acoustic barriers and acoustic sensors

The development of new materials and coatings provide also new solutions to problems related to acoustic isolation on architecture, vehicles or aircrafts. Fibrous materials have particularly interesting features for acoustic barriers, as they are usually light, resistant and adaptable to diverse geometries [1]. The sound absorption coefficient is calculated as the quotient between the acoustic… Continue reading Electrospinning fibers: acoustic barriers and acoustic sensors

pH effects on sol-gel synthesis

The sol-gel synthesis can be obtained from metallo-organic compounds using alkoxides 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, …). Such chemicals are dispersed in a solvent (usually organic, ethyl alcohol) and react in an pH controlled medium. In this post,… Continue reading pH effects on sol-gel synthesis

Electrospinning: enzyme encapsulation for food industry

On July 20th  2017, the U.S. National Institute of Food and Agriculture (NIFA), part of the Department of Agriculture (USDA), announced a $4.6 million grant for research on nanotechnology applied to agriculture and food industry. “Nanotechnology is being rapidly implemented in medicine, electronics, energy, and biotechnology, and it has huge potential to enhance the agricultural… Continue reading Electrospinning: enzyme encapsulation for food industry

Hydrophobic coatings I

Hydrophobicity phenomena are present in nature; in the leaves of plants such as Nelumbo nucifera (lotus), in the wings of butterflies, or in the legs of water striders. It is also a leading surface property for corrosion protection, as hydrophobic surfaces are water and aqueous electrolytes repellant, anti-icing, bio-corrosion and anti-fouling [1]. These properties can… Continue reading Hydrophobic coatings I

Sol-gel and architecture I: anti-reflective coatings

The use of light building envelopes, made of materials such as steel and glass, has progressively substituted the traditional concrete and brick structures. This change poses new design challenges in order to control parameters such as the solar factor, the thermal transmittance, visual transmittance, reflection index, among others [1]. The thermal and energetic efficiency of… Continue reading Sol-gel and architecture I: anti-reflective coatings

The Layer-by-Layer (LbL) assembly

The Layer-by-Layer (LbL) assembly, also called Electrostatic Self Assembly Multilayer (ESAM), consists of the immersion of the substrate into alternate solutions with opposite electric charge [1]. This electrostatic attraction is the main force of adhesion to the surface of the substrate. It was discovered in 1966 although this technique went unnoticed until the nineties, when… Continue reading The Layer-by-Layer (LbL) assembly

Biomedical applications of electrospinning: drug delivery

Electrospinning technique offers numerous possibilities in drug delivery applications, by controlling the material (organic, inorganic, biodegradable or non-biodegradable…), the delivered drug or the loading method. In this article, we present an overview of the drug delivery applications of electrospinning. Fiber materials: Biodegradable and non-biodegradable materials behave differently regarding drug release. Non-biodegradable materials release drug mainly… Continue reading Biomedical applications of electrospinning: drug delivery