Ya sea que se utilice para construir rascacielos, bicicletas o aislamiento de espuma, la madera es conocida por ser una alternativa fuerte, abundante, barata y renovable a los materiales de construcción convencionales. Y pronto podría incluso abrirse camino a las ventanas y celdas solares, como un sustituto más barato para el vidrio tradicional a base de sílice. Más info http://www.wired.co.uk/news/archive/2016-03/31/transparent-wood-building-walls-solar-cells
#3 Resumen: extren la lignina y la substituyen por acrilico.
Delignification
Balsa wood (Ochroma pyramidale, purchased from Wentzels Co. Ltd., Sweden) with a density of 160 kg/m3 was dried at 105 ± 3 °C for 24 h before chemical extraction. The dried samples were extracted using 1 wt % of sodium chlorite (NaClO2, Sigma-Aldrich) with acetate buffer solution (pH 4.6) at 80 °C.(19) The sample dimension is 20 mm × 20 mm, with a thickness of 0.6 ± 0.1, 1.0, 2.5 ± 0.1, 5.0, and 8.0 mm. The reaction time for samples with thicknesses below 3 mm was 6 h and 12 h for samples with larger thicknesses of 5 and 8 mm. More reactions were done on samples with dimension of 100 mm × 100 mm × 1 mm to show the feasibility to work on larger samples. The extracted samples were carefully washed with deionized water followed by dehydration using first pure ethanol, then a 1:1 (volume ratio) mixture of ethanol and acetone, and finally, pure acetone (step by step). Each step was repeated three times.
Fabrication of Transparent Wood
Transparent wood was made by infiltrating the delignified wood template by a prepolymerized methyl methacrylate (MMA) solution and heated in an oven at 70 °C for 4 h. Pure MMA monomer was prepolymerized at 75 °C for 15 min in two-necked round-bottom flask with 0.3 wt % 2,2′-Azobis (2- methylpropionitrile) (AIBN, Sigma-Aldrich) as initiator. The prepolymerized MMA was cooled down to room temperature in ice–water bath to terminate the reaction. After that, the delignified wood template was infiltrated in prepolymerized MMA solution under vacuum for 30 min. Vacuum infiltration was repeated three times to ensure the full infiltration. Finally, the infiltrated wood was sandwiched between two glass slides and packaged in aluminum foil before further polymerization. The polymerization process was completed by heating the infiltrated wood sample in an oven at 70 °C for 4 h.
Comentarios
En realidad han desarrollado un material entre cuyos ingredientes está la madera, pero de ahí a madera transparente...
#3 Resumen: extren la lignina y la substituyen por acrilico.
Delignification
Balsa wood (Ochroma pyramidale, purchased from Wentzels Co. Ltd., Sweden) with a density of 160 kg/m3 was dried at 105 ± 3 °C for 24 h before chemical extraction. The dried samples were extracted using 1 wt % of sodium chlorite (NaClO2, Sigma-Aldrich) with acetate buffer solution (pH 4.6) at 80 °C.(19) The sample dimension is 20 mm × 20 mm, with a thickness of 0.6 ± 0.1, 1.0, 2.5 ± 0.1, 5.0, and 8.0 mm. The reaction time for samples with thicknesses below 3 mm was 6 h and 12 h for samples with larger thicknesses of 5 and 8 mm. More reactions were done on samples with dimension of 100 mm × 100 mm × 1 mm to show the feasibility to work on larger samples. The extracted samples were carefully washed with deionized water followed by dehydration using first pure ethanol, then a 1:1 (volume ratio) mixture of ethanol and acetone, and finally, pure acetone (step by step). Each step was repeated three times.
Fabrication of Transparent Wood
Transparent wood was made by infiltrating the delignified wood template by a prepolymerized methyl methacrylate (MMA) solution and heated in an oven at 70 °C for 4 h. Pure MMA monomer was prepolymerized at 75 °C for 15 min in two-necked round-bottom flask with 0.3 wt % 2,2′-Azobis (2- methylpropionitrile) (AIBN, Sigma-Aldrich) as initiator. The prepolymerized MMA was cooled down to room temperature in ice–water bath to terminate the reaction. After that, the delignified wood template was infiltrated in prepolymerized MMA solution under vacuum for 30 min. Vacuum infiltration was repeated three times to ensure the full infiltration. Finally, the infiltrated wood was sandwiched between two glass slides and packaged in aluminum foil before further polymerization. The polymerization process was completed by heating the infiltrated wood sample in an oven at 70 °C for 4 h.
http://pubs.acs.org/doi/full/10.1021/acs.biomac.6b00145
#3 la madera es la base del producto, el PMMA se añade sólo para alterar su transparencia
#7 No sólo eso. "Transparent wood with a cellulosic wood template volume fraction of 19% showed twice as high strength and modulus as for neat PMMA."
Puedes verlo en el gráfico de la derecha en #4
"Es atractivo que el material provenga de fuentes renovables", dice Berglund. "También ofrece excelentes propiedades mecánicas, incluyendo resistencia, tenacidad, baja densidad y baja conductividad térmica," añadió.
muy prometedor...
#1 Las hojas de parra ya no van a cubrir nada
Parece bastante transparente.
http://pubs.acs.org/doi/abs/10.1021/acs.biomac.6b00145
#4 85% no está nada mal
A vueltas otra vez con la co..-..la light; será el nombre que quieran, pero madera no.
Vamos han redescubrierto lo que viene a ser el papel cebolla de toda la vida para copiar dibujos...