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Lee, Song Yi, et al. Applied Sciences 7.9 (2017): 902.
Nano composite (NC) materials loaded with zinc sulfate monohydrate (ZnSO4) were prepared using a hot melt extrusion (HME) system. Soluplus (SP) was used as the amphiphilic polymer matrix for HME processing. Using SP for HME processing, the microscale size of the ZnSO4 dispersion was reduced to the nanoscale. Through HME processing, ZnSO4 can be uniformly dispersed in SP. ZnSO4/SP NC with an average diameter of 75 nm, a polydispersity index of 0.1, and a zeta potential value of -1 mV was prepared.
Preparation of ZnSO4/SP NC
Before extrusion, zinc sulfate monohydrate (ZnSO4) and Soluplus (SP) (3:7, w/w) were blended, and then fed into the extruder at a rate of 50 g/min. These mixtures were processed through a twin-screw hot melt extruder equipped with a circular die (2 mm diameter). The barrel temperatures were maintained as shown in the figure, and the screw speed was set to 200 rpm. The extrudate was cooled to room temperature and ground into a powder using a grinding mill.
Sagunthala, P., et al. Ferroelectrics 504.1 (2016): 96-103.
Second-order nonlinear optical (NLO) materials have recently attracted considerable attention due to their potential applications in emerging optoelectronic technologies. Glycine (NH2-CH2-COOH) is the simplest amino acid. Unlike other amino acids, it has no asymmetric carbon atom and is optically inactive. It has three polymorphic crystal forms, α, β, and γ. Here, glycine single crystals doped with zinc sulfate monohydrate (ZnSO4·H2O) were prepared.
High purity (99.9% AR grade) ZnSO4·H2O and glycine samples were used for crystal preparation. Saturated solutions of ZnSO4·H2O and glycine were prepared using double-distilled water and filtered twice using Whatman No.1 filter paper to remove dust particles and undissolved matter. The prepared solutions were mixed in a 1:3 ratio and continuously stirred using a magnetic stirrer for six hours. The pH 3 mixture was then placed in a clean beaker, covered with perforated aluminum foil, and slowly evaporated in a dust-free, vibration-free environment. After a time span of 61 days, good quality transparent single crystals of glycine doped with zinc sulfate monohydrate were harvested. As shown in the figure, the size of the grown crystals was 19 x 9 x 3 mm3. Different characterizations of the grown crystals were carried out to understand their suitability for device fabrication.
Machovsky, Michal, et al. Materials Research Bulletin 48.10 (2013): 4002-4007.
Layered materials consist of stacked two-dimensional charged layers with intercalated water molecules and compatible charged chemical species occupying the nanometer-scale interlayer spaces, which have attracted great attention in academia and industry. The interest in these materials primarily arises from their ability to undergo rich intercalation chemistry by exchanging interlayer cations/anions with various organic and inorganic molecules having the same charge. In this work, we report the microwave-assisted hydrothermal synthesis of zinc hydroxide sulfate, Zn4(OH)6SO4·nH2O (ZHS), a layered hydroxide salt, by simple precipitation of zinc sulfate monohydrate (ZnSO4·H2O) using hexamethylenetetramine.
The synthesis process is as follows: 0.05 mol of ZnSO4·H2O and 0.05 mol of hexamethylenetetramine were separately dissolved in 100 mL and 50 mL of deionized water, respectively. The obtained solutions were mixed in a reaction vessel and immediately subjected to microwave irradiation in the microwave oven cavity. The temperature of the reaction mixture rose sharply within the first 2 minutes and reached a maximum of 97 °C at the start of the third minute. It should be noted that the temperature was measured from a slightly larger solid angle than the reaction vessel, so the measured temperature value only indicates the maximum temperature, at which point the mixture was boiling vigorously. After 3 minutes of microwave irradiation, the microwave system was turned off, and the mixture was allowed to cool naturally. The white precipitate was filtered (0.23 μm pore size membrane), thoroughly washed with deionized water several times, and then dried in a laboratory oven at 40 °C for 24 hours.
