کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
810502 1469090 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nacre-like hybrid films: Structure, properties, and the effect of relative humidity
ترجمه فارسی عنوان
فیلم های هیبرید نر مانند: ساختار، خواص و اثر رطوبت نسبی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی پزشکی
چکیده انگلیسی


• Hybrid chitosan and alumina thin films with nacre-like microstructure fabricated.
• Volume fraction of alumina and tensile testing relative humidities were controlled.
• Increasing volume fractions of alumina results in increased film modulus.
• Relative humidity can be used to control the mechanical properties of the films.

Functional materials often are hybrids composed of biopolymers and mineral constituents. The arrangement and interactions of the constituents frequently lead to hierarchical structures with exceptional mechanical properties and multifunctionality. In this study, hybrid thin films with a nacre-like brick-and-mortar microstructure were fabricated in a straightforward and reproducible manner through manual shear casting using the biopolymer chitosan as the matrix material (mortar) and alumina platelets as the reinforcing particles (bricks). The ratio of inorganic to organic content was varied from 0% to 15% and the relative humidities from 36% to 75% to determine their effects on the mechanical properties. It was found that increasing the volume fraction of alumina from 0% to 15% results in a twofold increase in the modulus of the film, but decreases the tensile strength by up to 30%, when the volume fraction of alumina is higher than 5%. Additionally, this study quantifies and illustrates the critical role of the relative humidity on the mechanical properties of the hybrid film. Increasing the relative humidity from 36% to 75% decreases the modulus and strength by about 45% and triples the strain at failure. These results suggest that complex hybrid materials can be manufactured and tailor made for specific applications or environmental conditions.

Figure optionsDownload high-quality image (286 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Mechanical Behavior of Biomedical Materials - Volume 55, March 2016, Pages 140–150
نویسندگان
, , , ,