Renovação
Autor: EXCLUSIVA MINERAÇÃO E SIDERURGIA | Publicado: 2016-10-27T06:07:00-07:00


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Piso de
madeira gera eletricidade a cada pisada

Redação
do Site Inovação Tecnológica&nbsp;-&nbsp; 27/10/2016













O professor Xudong Wang acredita
que os nanogeradores durarão enquanto durar o piso. [Imagem:&nbsp;Stephanie
Precourt/UW-Madison]





Colheita de energia

Já existem sapatos capazes de gerar energia,
assim como projetos para transformar o piso inteiro em um gerador de
eletricidade, permitindo aproveitar o movimento dos pedestres e veículos para
iluminar ruas, calçadas e prédios comerciais.



A ideia de Chunhua Yao e seus
colegas da Universidade Wisconsin-Madison, nos EUA, é tornar esses sistemas de
colheita de energia mais ambientalmente amigáveis, dispensando os materiais
piezoelétricos tradicionais, o que permitirá a adoção dessas tecnologias dentro
de casa.



Para isso, eles se voltaram para
um material que poucos desconfiariam poder ser usado para gerar eletricidade: a
polpa de madeira já utilizada em pisos em todo o mundo.

Nanogerador de celulose para aplicar
     remédios


Nanogerador de celulose

A polpa de madeira contém em sua
composição nanofibras de celulose que,
quando tratadas com compostos químicos adequados, produzem uma pequena carga
elétrica quando entram em contato com fibras não tratadas.



Leve em conta os milhões de
nanofibras presentes em centímetro quadrado de piso e está pronto um gerador
triboelétrico, capaz de produzir uma quantidade aproveitável de energia - triboeletricidade é o mesmo
fenômeno que produz a eletricidade estática nas
roupas.

Os primeiros protótipos mostraram
que os pisos de madeira produzem eletricidade suficiente para alimentar
lâmpadas de LED ou recarregar celulares.



Vida longa

"Nosso teste inicial em
laboratório mostrou que [o gerador] funciona por milhões de ciclos sem qualquer
problema. Nós não convertemos esses números em anos de vida do piso ainda, mas
acredito que, com um projeto adequado, ele pode definitivamente superar a vida
útil do próprio piso," disse o professor Xudong Wang, coordenador da
equipe.



Como a polpa de madeira é barata,
e muitas vezes descartada pelas empresas, a equipe acredita que o baixo custo
da matéria-prima poderá ajudar a colocar sua ideia no mercado.





Bibliografia:

Triboelectric nanogenerators and power-boards from cellulose nanofibrils and
recycled materials
Chunhua Yao, Alberto Hernandez, Yanhao Yu, Zhiyong Cai, Xudong Wang
Nano Energy
Vol.: 30, December 2016, Pages 103-108
DOI: 10.1016/j.nanoen.2016.09.036