scholarly journals Study of Thermodynamic and Acoustic Properties of Niacin in Aqueous Hexylene Glycol and Propylene Glycol at Different Temperatures

ACS Omega ◽  
2020 ◽  
Vol 5 (50) ◽  
pp. 32357-32365
Author(s):  
Nabaparna Chakraborty ◽  
Kailash Chandra Juglan ◽  
Harsh Kumar
Keyword(s):  
Propylene Glycol ◽  
Acoustic Properties ◽  
Hexylene Glycol ◽  
Different Temperatures

scholarly journals Fano resonance based defected 1D phononic crystal for highly sensitive gas sensing applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Shrouk E. Zaki ◽  
Ahmed Mehaney ◽  
Hekmat M. Hassanein ◽  
Arafa H. Aly
Keyword(s):  
Band Gap ◽  
Gas Sensor ◽  
Fano Resonance ◽  
Figure Of Merit ◽  
Phononic Crystal ◽  
Acoustic Properties ◽  
Effect Of Temperature ◽  
Sensing Applications ◽  
Damping Rate ◽  
Different Temperatures

Abstract The defected acoustic band gap materials are promising a new generation of sensing technology based on layered cavities. We introduced a novel 1D defected phononic crystal (1D-DPC) as a high-sensitive gas sensor based on the Fano resonance transmitted window. Our designed (Lead–Epoxy) 1D-DPC multilayer has filled with a defect layer with different gases at different temperatures. In this study, Fano resonance—based acoustic band gap engineering has used to detect several gases such as O2, CO2, NH3, and CH4. For the first time, Fano resonance peaks appeared in the proposed gas sensor structures which attributed to high sensitivity, Q-factor, and figure-of-merit values for all gases. Also, the relation between the Fano resonance frequency and acoustic properties of gases at different temperatures has been studied in detail. The effect of the damping rate on the sensitivity of the gas sensor shows a linear behavior for CO2, O2, and NH3. Further, we introduced the effect of temperature on the damping rate of the incident waves inside the 1D-DPC gas sensor. The highest sensitivity and figure of merit were obtained for O2 of 292 MHz/(kg/m3) and 647 m3/Kg, respectively. While the highest figure-of-merit value of 60 °C−1 at 30 °C was attributed to O2. The transfer matrix method is used for calculating the transmission coefficient of the incident acoustic wave. We believe that the proposed sensor can be experimentally implemented.

Volumetric and acoustic properties of binary systems (furfural or furfuryl alcohol+toluene) and (furfuryl alcohol+ethanol) at different temperatures

2015 ◽  
Vol 611 ◽  
pp. 47-55 ◽  
Author(s):  
M. Zaoui-Djelloul-Daouadji ◽  
L. Bendiaf ◽  
I. Bahadur ◽  
A. Negadi ◽  
D. Ramjugernath ◽  
...  
Keyword(s):  
Furfuryl Alcohol ◽  
Binary Systems ◽  
Acoustic Properties ◽  
Different Temperatures

scholarly journals Shelf-Life Evaluation and Lyophilization of PBCA-Based Polymeric Microbubbles

Pharmaceutics ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 433 ◽  
Author(s):  
Tarun Ojha ◽  
Vertika Pathak ◽  
Natascha Drude ◽  
Marek Weiler ◽  
Dirk Rommel ◽  
...  
Keyword(s):  
Shelf Life ◽  
Rhodamine B ◽  
Freeze Drying ◽  
Pharmaceutical Products ◽  
Acoustic Properties ◽  
Signal Generation ◽  
Freeze Dried ◽  
Different Temperatures ◽  
The Stability ◽  
Commercial Platform

Poly(n-butyl cyanoacrylate) microbubbles (PBCA-MB) are extensively employed for functional and molecular ultrasound (US) imaging, as well as for US-mediated drug delivery. To facilitate the use of PBCA-MB as a commercial platform for biomedical applications, it is important to systematically study and improve their stability and shelf-life. In this context, lyophilization (freeze drying) is widely used to increase shelf-life and promote product development. Here, we set out to analyze the stability of standard and rhodamine-B loaded PBCA-MB at three different temperatures (4 °C, 25 °C, and 37 °C), for a period of time of up to 20 weeks. In addition, using sucrose, glucose, polyvinylpyrrolidone (PVP), and polyethylene glycol (PEG) as cryoprotectants, we investigated if PBCA-MB can be lyophilized without affecting their size, concentration, US signal generation properties, and dye retention. Stability assessment showed that PBCA-MB remain largely intact for three and four weeks at 4 °C and 25 °C, respectively, while they disintegrate within one to two weeks at 37 °C, thereby compromising their acoustic properties. Lyophilization analyses demonstrated that PBCA-MB can be efficiently freeze-dried with 5% sucrose and 5% PVP, without changing their size, concentration, and US signal generation properties. Experiments involving rhodamine-B loaded MB indicated that significant dye leakage from the polymeric shell takes place within two to four weeks in case of non-lyophilized PBCA-MB. Lyophilization of rhodamine-loaded PBCA-MB with sucrose and PVP showed that the presence of the dye does not affect the efficiency of freeze-drying, and that the dye is efficiently retained upon MB lyophilization. These findings contribute to the development of PBCA-MB as pharmaceutical products for preclinical and clinical applications.

scholarly journals Thermodynamic solubility of piroxicam in propylene glycol + water mixtures at 298.2-323.2 K: Data report and modeling

2015 ◽  
Vol 80 (4) ◽  
pp. 509-515 ◽  
Author(s):  
Shahla Soltanpour ◽  
Zahra Bastami
Keyword(s):  
Propylene Glycol ◽  
Binary Mixtures ◽  
Acceptable Range ◽  
Different Temperatures ◽  
Data Points ◽  
Reported Data

The solubility of piroxicam (66 data points) in binary mixtures of propylene glycol (PG) + water at six different temperatures which ranged from 298.2 K to 323.2 K were reported. Three different cosolvency models; Yalkowsky, Jouyban-Acree and combined version of the Jouyban-Acree model with van?t Hoff approach, have been used for correlating the reported data. All the analyses results show the acceptable range of the error percentages.

scholarly journals Acoustic Properties of Resonant Spruce Wood Modified Using Oil-Heat Treatment (OHT)

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1962
Author(s):  
Przemysław Mania ◽  
Mateusz Gąsiorek
Keyword(s):  
Heat Treatment ◽  
Modulus Of Elasticity ◽  
Acoustic Properties ◽  
Bending Test ◽  
Acoustic Parameters ◽  
Static Modulus ◽  
Spruce Wood ◽  
Before And After ◽  
Different Temperatures ◽  
The Mean

Wedge-shaped boards of spruce wood (Picea abies Karst.) are used to make violin fronts, also known as soundboards. Oil-heat treatment (OHT) can influence the acoustic properties of resonant wood, such as spruce. In this study, the effect of OHT on spruce wood was evaluated, using palm oil as a heating medium, at four different temperatures: 140, 160, 180 and 200 °C. Physical, mechanical and acoustic properties of spruce wood were evaluated before and after OHT and included the following: density, modulus of elasticity in the static bending test, and wood sound velocity. The acoustic parameters after OHT improved; however, the samples bent after modification had a higher modulus of elasticity, with a simultaneous deterioration of the acoustic parameters. The dynamic modulus of elasticity increased by 11%, and the musical constant by 5%. The static modulus increased by more than 3.5%, but the acoustic parameters calculated on the basis of these results indicated a deterioration of the acoustic properties of completely oven-dried wood. The increase in moisture content to air-dried condition contributed to a slight increase in the mean musical constant at the highest modification temperature.

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