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- W1489296111 abstract "Biopolymers and polymers derived from the biomass (Gandini, 2008; Mooney, 2009) are abundant natural chemical substances that find applications in many fields like agriculture, agro-food industry, textile and medicine, etc.. . A vast majority of them does not cause problems to the environment (Perez et al., 2002), contrary to synthetic polymers (Moore, 2008). Their natural resource is continuously renewed and they are traditionally used since the prehistoric times. The recent problems like climate change, fossil fuels depletion and growing costs of recycling due to strictly observed modern environmental concerns, have renewed our interest for a modern form of bio-based economy. This results in an increased use of natural substances and a search for new energy efficient engineering processes. The laser-based technologies have emerged (Bauerle, 2000) since the early sixties date of the laser birth, that is to say very recently, and are now explored for new types of processing, like micro-precise laser characterization, ablation and machining, by various appealing experimental approaches (Fig.1). Laser processing and characterization of materials in general offer definite advantages like the cost-efficiency due to rapidity and the submicroprecision (Lazare & Tokarev 2005a). They are considered as techniques lending themselves easily to future automation and industrialization. Moreover it is generally recognized that laser beams make it possible to perform a remote characterization and treatment of the target with a large working distance, which in the extreme case can easily be up to the kilometer range (as in LIDAR) depending on the laser beam quality (Telle et al., 2007). A new micro-foaming transition of biopolymer films was discovered (Lazare et al., 2005b) during the study of laser ablation of collagen, a biopolymer extracted from rat tails tendon. In these experiments the absorption of one KrF excimer laser pulse produces a layer of foamy material on the surface of the collagen film (Fig.1). For the first time, with a unique pulse a clearly visible and highly interesting transformation of a material was produced, and which was not the simple removal of matter like in regular laser ablation (Figs.1.1 for surface ablation, 1.2 for multi-pulse micro-drilling, and 1.3 for surface modification), often called “clean ablation” as known from previous studies (Weisbuch, 1999; Tokarev, 2003; Lippert & Dickinson, 2003; Elaboudi, 2008). Usually thermal and photochemical decomposition of the polymer are considered to account for the ejection of the gas products." @default.
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- W1489296111 date "2010-09-28" @default.
- W1489296111 modified "2023-10-01" @default.
- W1489296111 title "Microfoams of Biopolymers by Laser-Induced Stretching: Mechanisms and Applications" @default.
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- W1489296111 doi "https://doi.org/10.5772/10260" @default.
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