کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
544376 1450384 2012 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermal properties of nanocapsules measured by scanning force microscopy methods
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر سخت افزارها و معماری
پیش نمایش صفحه اول مقاله
Thermal properties of nanocapsules measured by scanning force microscopy methods
چکیده انگلیسی

Heated micromechanical cantilevers were used to probe the thermal properties of nanogram samples in two ways: (i) as a micromechanical thermogravimetric balance and (ii) as a local nano-heater for heating individual objects. For micromechanical thermogravimetry, 6 ng of polyurethane nanocapsules containing silverazide were freeze dried and attached to the micromechanical cantilever apex. The resonant frequency of the micromechanical cantilever upon heating was recorded. After heating to 250 °C, 25% mass was found remaining on the micromechanical cantilever. In order to image structural changes, the tip of the heatable micromechanical cantilever was positioned on individual nanocapsules weighing less than 6 fg, and the capsule was imaged using a scanning force microscope. Then the cantilever was heated and temperature–deflection curves were recorded. Both methods revealed a decomposition temperature of 180 °C for silverazide encapsulated in a polyurethane nanocapsule. Topographic images of individual capsules after decomposition showed a rupture of the shell at one position.

Figure optionsDownload as PowerPoint slideHighlights
► Analysis of thermal properties of polymeric nanocapsules containing gas generators.
► Comparison of two different SPM based techniques using heatable cantilevers.
► Cantilevers as ultrasensitive balance for nano-thermal gravimetric analysis.
► Analysis and imaging of single capsules.
► Analysis of decomposition temperature and shell rupture.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microelectronic Engineering - Volume 97, September 2012, Pages 223–226
نویسندگان
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