segunda-feira, fevereiro 05, 2007

Especialistas em ambiente alertam para perigos da nanotecnologia

O Programa das Nações Unidas para o Ambiente (PNUA) instou hoje os decisores políticos a procederem com urgência a uma avaliação da nanotecnologia, por considerar que a sua segurança requer um maior controlo e regulamentação.

Esta chamada de atenção consta de um relatório de 87 páginas sobre o ambiente global, apresentado hoje por aquela agência da ONU em Nairobi, na abertura Fórum Ministerial Global sobre Ambiente.

O documento, elaborado por 80 peritos de todo o mundo, diz ser prioritário o estudo dos potenciais riscos dos nanomateriais que estão já a ser produzidos em massa.

A nanotecnologia — a tecnologia do infinitamente pequeno — baseia-se na utilização de átomos como blocos de construção, tendo como escala o nanómetro, ou seja, um milionésimo de milímetro.

O seu objectivo é desenvolver novos produtos e materiais através da alteração ou criação de materiais a nível atómico e molecular, com aplicações em indústrias como a alimentar ou a farmacêutica, na cosmética ou na medicina.

Por exemplo, são já usados nanomateriais na produção de raquetes de ténis mais resistentes, de vestuário resistente às nódoas ou de janelas com auto-limpeza.

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Segundo o relatório, não é claro o que acontece com as nanopartículas quando estas se libertam na atmosfera, na água ou no solo.

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Notícia: http://www.publico.clix.pt/shownews.asp?id=1284704

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