A new hydrogen-bond acidic carbosiloxane polymer for quartz crystal microbalance sensors (QCMs) application was
synthesized via O-alkylation, Claisen rearrange, hydrosilylation reaction and functionalized the polysiloxane with
trifluoroacetone groups (TFA). The trifluoroisopropanol functionalized polysiloxane was characterized by FT-IR and
1HNMR. And this novel siloxane polymer was coated onto AT-cut 8 MHz QCM sensors to investigate its gas sensitive
responses to the organophosphorus nerve agent stimulant dimethyl methylphosphonate (DMMP) vapor as well as other
interfering organic vapors. The research work indicated that frequency shifts of the trifluoroisopropanol functionalized
polysiloxane based QCM sensor to the DMMP vapor were completely linear, and with a regression coefficient of 0.9973
in the concentration range of 10-60 ppm. In addition, the sensitivity of the fabricated QCM sensors to DMMP was up to
10.64 Hz/ ppm, and much higher than the other interfering vapors, limits of detection (LODs) of the QCM sensors was
0.28 ppm, thus high selectivity to DMMP was demonstrated in this work.
Research of the interaction process between high energy pulse laser using millisecond pulse width and a PIN junction
photodiode is presented. A 3-D physical modeling of the interaction is accommodated for the thermal interaction
analysis. Considering variety of the thermophysical parameters, numerical method is utilized to solve governing
equations of heat transfer with heat generation term. For different magnitudes of pulse energy,axial and radial
temperature distribution as function of time and position before melting have been calculated, and the relevant physical
process has been discussed. In addition, influence of different magnitudes of pulse energy on the temperature rise in the
material composing photodiode is investigated. Numerical results show that heat conduction has effect to the whole
course between laser and material interaction. Moreover, the rate of temperature rise has a deep effect for different
magnitudes of pulse energy during laser irradiation.
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