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VeilleNanos - Silica nanoparticles

Silica nanoparticles

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By the AVICENN team – Last added July 2021

Silica nanoparticles

Multiple application sectors

Silica is used by industry in a wide variety of applications. Synthetic amorphous silicas (SAS) are used as :

  • infood, as a food additive (E551) or “technological auxiliary”:
    • anti-caking agent in powdered foodstuffs (sugar, salt, flour, cocoa, and many dehydrated products such as soups, instant noodles, coffee, etc.)
    • or viscosity modifier in sauces, soups, dressings, etc.
    • we would absorb on average about 124 mg per day
    • authorized, including in nano form for precisely defined uses (powdered foodstuffs, sugar, salt, seasoning, rice…) in 2009
    • its safety is questionable.
  • moisture absorber in many products (including baby diapers and sanitary napkins)1Two reports from the Anses attest to this (without specifying the potential associated risks):
    Safety of baby diapers – Revised opinion of the Anses, Collective expertise report, Anses, January 2019
    Safety of intimate protection products, Anses, December 2019: the study of the national registry of substances in the nanoparticulate state (r-nano) confirmed that “Silica in the nanoparticulate state is used for its “superabsorbent” properties. It is notably sold to actors involved in the manufacture of diapers and intimate protection.”)
  • reinforcing or thickening agents in various systems (elastomers, resins, paints, inks)
  • beer and wine clarification agents
  • texturizing / fluidizing agents for cosmetic (lipsticks, shampoos, creams), pharmaceutical or toothpaste products
  • non-stick coatingCf.2e.g. “Nanomaterials – Silica coating more slippery than Teflon”, Die Welt, March 2010 (like Teflon)

What presence of silica nanoparticles in France?

According to the Ministry of Ecological Transition and SolidarityCf.3bilan R-nano 2019, Ministry of Ecological Transition and Solidarity, June 2020, between 10,000 and 100,000 tons of silicon dioxide (SiO2) nano were officially imported or manufactured in France in 2018. This range is not very precise and should be considered as an indication only because the quantities registered in the French R-nano register are below the quantities actually present on the French market, as many nanomaterials escape declaration.

Since the implementation of the declaration of “substances in nanoparticulate form” in 2013, it has been confirmed that different nanoforms of silica are imported or produced in France Several forms of substances in the nanoparticulate state have been declared, under different names: “silica gel”, “silicon dioxide”, “synthetic amorphous silica”, “salicylic acid – magnesium salt”, “silane”, “silicon dioxide”, “silicate”, “silane”, “dichlorodimethyl-“, “products of reaction with silica”)

Almost all (if not all) of the primary silica particles used are nanomaterials:

  • that the SAS used in cosmetics In July 2019, the European Scientific Committee on Consumer Safety (SCCS) published its final opinion on the solubility of synthetic amorphous silica (SAS)5Opinion on solubility of Synthetic Amorphous Silica (SAS), Scientific Committee on Consumer Safety (SCCS), June 20-21, 2019 (Corrigendum of December 6, 2019) according to which hydrophilic and hydrophobic SAS are to be considered as insoluble or very slightly soluble; under the Cosmetics Regulations 2009, these two SAS are therefore to be considered as nanomaterials and should be labelled with the words [nano].

Vigilance is required because there are significant risks associated with silica nanoparticles.

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Les prochains RDV nanos

How the world deals with Materials on the Nanoscale – Responsible Use and Challenges (OECD-BMUV, Berlin)
  • International Conference from June 22 to 23, 2023
  • Organizers: OECD, German Federal Ministry for the Environment, Nature Conservation, Nuclear Safety and Consumer Protection(BMUV)
  • Website: https: //…
São Paulo School of Advanced Science on Nanotechnology, Agriculture & Environment (SPSAS NanoAgri&Enviro, São Paulo)
São Paulo
  • From July 3 to 15, 2023 in São Paulo
  • Organizer: FABESP
  • Application from November 18 to February 05. Registration fees and travel expenses are covered.
  • Speakers: see the complete program here.

File initially put on line in June 2016

Notes & références

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