Authors:Jeremy L. Steinbacher, Yankai Lui, Brian P. Mason, William L. Olbricht, and D. Tyler McQuade
We present and validate simple mesofluidic devices for producing monodisperse droplets and materials. The significance of this work is a demonstration that simple and complex droplet formulations can be prepared uniformly using off-the-shelf small-diameter tubing, barbed tubing adapters, and needles. With these simple tools, multiple droplet-forming devices and a new particle concentrator were produced and validated. We demonstrate that the droplet-forming devices could produce low-dispersity particles from 25 to 1200 Km and that these results are similar to results from more complicated devices. Through a study of the fluid dynamics and a dimensional analysis of the data, we have correlated droplet size with two dimensionless groups, capillary number and viscosity ratio. The flowfocusing device is more sensitive to both parameters than the T-junction geometry. The modular character of our mesofluidic devices allowed us to rapidly assemble compound devices that use flow-focusing and T-junction devices in series to create complex droplet-in-microcapsule materials. This work demonstrates that flow chemistry does not require complicated tools, and an inexpensive tool-kit can allow anyone with interest to enter the field.
Authors:M. Popa, J. Calderon-Moreno, D. Crisan, and M. Zaharescu
This work introduces results obtained during the preparation of a Bi-based material with superconducting properties by oxalate
The influence of Fe presence on the precursors thermal stability and on the superconducting phases formation mechanism are
presented. The thermal decomposition and the stability in air of FeC2O42H2O and also of the components mixture were studied by DTA/TG. It was evidenced that iron oxalate decomposes at the lowest temperature
compared to the decomposition temperatures of the individual oxalates.
XRD, IR and TEM/ED studies were approached to investigate the individual oxalates and the mixture coprecipitates for the high-Tc superconducting material synthesis.
The system of sulfoaluminate ferrite belite (SAFB) clinkers premixed with Portland cement (PC) in mass ratio 85:15 in combination
with hydroxypropylmethyl cellulose (HPMC) or polyphosphates(poly-P) was used for the syntheses of Macro-Defect-Free (MDF)
materials. The subsequent moisture treatment and thermal stability of these MDF materials were investigated. The effect of
individual humidity upon the evolution of mass is more intensive than the effects of composition of MDF materials or duration
of the original MDF material synthesis. Detailed values of mass changes at 100% relative humidity (RH) and under ambient conditions
are strongly affected by the nature of polymer used. A significant improvement of moisture resistance of MDF materials is
achieved when the materials are dried after 24 h of finishing the pressure application. In the inter-phase section of MDF
material samples, the content ofC-(A,F)-S hydraulic phases, mainly tetracalcium aluminate ferrite monosulphatehydrate (AFm) decomposing by 250°C and CaCO3 decomposing at 600–700°C increase after the moisture attack, while cross-links in AFm-like section with typical thermoanalytical
traces in temperature region 250–550°C remain intact.
Authors:S. Janarthanan, R. Sugaraj Samuel, Y. C. Rajan, P. R. Umarani, and S. Pandi
, FTIR and UV–Vis–NIR spectral analysis and thermogravimetric and differential thermal analysis (TG-DTA). The NLO property of the compound was confirmed by Kurtz–Perry powder technique.
Materials and methods
Authors:Ewa Drożdż-Cieśla, Jan Wyrwa, Jolanta Broś, and Mieczysław Rękas
good thermal compatibility between cermet and YSZ material.
Electrical properties measurements allowed demonstration that the presented method cermet materialssynthesis leads to a value of conductivity suitable for SOFC anodes.
Authors:M. Barczak, M. Oszust-Cieniuch, P. Borowski, Z. Fekner, and E. Zięba
MaterialsSynthesis of SBA-15 materials was carried out using the following reagents: tetraethoxysilane (TEOS, 96%, ABCR), Pluronic P123 (P123, BASF), sucrose (Polish Sugar, National Sugar Company), hydrochloric acid (36%, POCH), ethanol (99
Authors:Liying Song, Kaixiang Li, Xiaohong Li, and Peng Wu
Synthesis of xRu-MP
The preparation of xRu-MP was similar to that of FDU-15 mesopolymer by an EISA method [ 23 ]. The pH of resol precursors was adjusted to 7.0 with two different routes. The first was
Authors:Adney Luís A. da Silva, Guilherme G. G. Castro, and Mariana M. V. M. Souza
characteristics of combustion reaction.
The materials used in the synthesis were metal nitrates: La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Cr(NO 3 ) 3 ·9H 2 O, and the propellants were citric