growth method
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2022 ◽  
Lalitha P ◽  
Arumugam S ◽  
Sinthiya A ◽  
Sugumari V

Abstract We have successfully produced Tricine Potassium Nitrate (TPN) single crystal synthesis using the solution growth method in this study. The powder X-ray diffraction (PXRD) technique was used to identify the phases of TPN crystals. Fourier transform infrared (FT-IR) analysis was performed to examine the functional groups contained in the produced crystals. To measure optical transparency, a UV-VIS-NIR investigation was conducted between 200 and 800nm. TPN crystal's photoluminescence (PL) spectrum was recorded. Vickers' hardness tester was used to investigate the mechanical characteristics of the formed crystal.Thermal gravimetric/differential thermal analysis was used to investigate the thermal behaviors of the produced crystals. The surface morphology of the formed crystal was determined using a field emission scanning electron microscope. Wet etching experiments were used to investigate the TPN crystal's growth feature. The shock damage threshold technique was used to determine the shock strength at which the crystal poses a risk. The Kurtz-Perry technique was used to investigate the effectiveness of the developed crystals' second harmonic generation (SHG). The antibacterial activity of TPN grown crystal against various standard bacterial strains.

2022 ◽  
Vol 14 (2) ◽  
pp. 273
Mengyao Li ◽  
Rui Zhang ◽  
Hongxia Luo ◽  
Songwei Gu ◽  
Zili Qin

In recent years, the scale of rural land transfer has gradually expanded, and the phenomenon of non-grain-oriented cultivated land has emerged. Obtaining crop planting information is of the utmost importance to guaranteeing national food security; however, the acquisition of the spatial distribution of crops in large-scale areas often has the disadvantages of excessive calculation and low accuracy. Therefore, the IO-Growth method, which takes the growth stage every 10 days as the index and combines the spectral features of crops to refine the effective interval of conventional wavebands for object-oriented classification, was proposed. The results were as follows: (1) the IO-Growth method obtained classification results with an overall accuracy and F1 score of 0.92, and both values increased by 6.98% compared to the method applied without growth stages; (2) the IO-Growth method reduced 288 features to only 5 features, namely Sentinel-2: Red Edge1, normalized difference vegetation index, Red, short-wave infrared2, and Aerosols, on the 261st to 270th days, which greatly improved the utilization rate of the wavebands; (3) the rise of geographic data processing platforms makes it simple to complete computations with massive data in a short time. The results showed that the IO-Growth method is suitable for large-scale vegetation mapping.

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 71
Brett Setera ◽  
Ching-Hua Su ◽  
Bradley Arnold ◽  
Fow-Sen Choa ◽  
Lisa Kelly ◽  

Chromium- and cobalt-doped zinc selenide nanoparticles were synthesized using a low-temperature reactive solution growth method. The morphological and optical characteristics were compared to those of doped zinc selenide (ZnSe) bulk crystals grown by the physical vapor transport (PVT) method. We observed agglomeration of particles; however, the thioglycerol capping agent has been shown to limit particle grain growth and agglomeration. This process enables doping by addition of chromium and cobalt salts in the solution. A slightly longer refluxing time was required to achieve cobalt doping as compared with chromium doping due to lower refluxing temperature. The nanoparticle growth process showed an average particle size of approximately 300 nm for both Cr- and Co-doped zinc selenide. The optical characterization of Co:ZnSe is ongoing; however, preliminary results showed a very high bandgap compared to that of pure ZnSe bulk crystal. Additionally, Co:ZnSe has an order of magnitude higher fluorescence intensity compared to bulk Cr:ZnSe samples.

2022 ◽  
Yingxin Xiao ◽  
Shitong Han ◽  
HaiLing Xi ◽  
Yubo JIn ◽  
Huaxiang Lin ◽  

Iodine (I) doped ZnO nanoarray film (ZnO/ I-X) were prepared on silicon wafer by the in-situ growth method. The structure and morphology of the samples have been test by XRD,...

2022 ◽  
Vol 43 (1) ◽  
pp. 012301
Tianyi Tang ◽  
Tian Yu ◽  
Guanqing Yang ◽  
Jiaqian Sun ◽  
Wenkang Zhan ◽  

Abstract InAs/GaAs quantum dot (QD) lasers were grown on silicon substrates using a thin Ge buffer and three-step growth method in the molecular beam epitaxy (MBE) system. In addition, strained superlattices were used to prevent threading dislocations from propagating to the active region of the laser. The as-grown material quality was characterized by the transmission electron microscope, scanning electron microscope, X-ray diffraction, atomic force microscope, and photoluminescence spectroscopy. The results show that a high-quality GaAs buffer with few dislocations was obtained by the growth scheme we developed. A broad-area edge-emitting laser was also fabricated. The O-band laser exhibited a threshold current density of 540 A/cm2 at room temperature under continuous wave conditions. This work demonstrates the potential of large-scale and low-cost manufacturing of the O-band InAs/GaAs quantum dot lasers on silicon substrates.

RSC Advances ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 664-670
Zeyu Li ◽  
Zhejian Cao ◽  
Carlos Grande ◽  
Wenjing Zhang ◽  
Yibo Dou ◽  

Poly acryl nitrile (PAN) nanofibers were prepared by electrospinning and coated with zeolitic imidazolate framework-8 (ZIF-8) by a phase conversion growth method and investigated for CO2 capture.

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 78
Hongjie Gao ◽  
Yun He ◽  
Jiankang Liu

Here, a new type of PEC aptamer sensor for bisphenol A (BPA) detection was developed, in which visible-light active MoS2/Ni-Fe LDH (layered double hydroxide) heterostructure and aptamer were used as photosensitive materials and biometric elements, respectively. The combination of an appropriate amount of MoS2 and Ni-Fe LDH enhances the photocurrent response, thereby promoting the construction of the PEC sensor. Therefore, we used a simple in situ growth method to fabricate a MoS2/Ni-Fe LDH sensor to detect the BPA content. The aptasensor based on aptamer/MoS2/Ni-Fe LDH displayed a linear range toward a BPA of 0.05–10 to 50–40,000 ng L−1, and it has excellent stability, selectivity and reproducibility. In addition, the proposed aptamer sensor is effective in evaluating real water samples, indicating that it has great potential for detecting BPA in real samples.

Anggraini Margono ◽  
Dini Asrianti Bagio ◽  
Indah Julianto ◽  
Endang Suprastiwi

Abstract Objective Platelet-rich plasma (PRP) activation is an important factor in triggering the initial release of blood-derived growth factors from platelets. Vascular endothelial growth factor-A (VEGF-A) can be expressed by human dental pulp stem cells (hDPSCs) and plays an important role in dental pulp angiogenesis. The aim of this study is to analyze the effects of calcium gluconate on PRP activation in hDPSC VEGF-A expression. Materials and Methods Two types of PRP and their corresponding activators were analyzed in this study: PRP (activated using calcium chloride/CaCl2) and PRP-T (activated using CaCl2 with the addition of 10% calcium gluconate). hDPSCs were obtained by using an out-growth method (DPSCs-OG), and harvest between the fifth and sixth passages, then cultured in three different media groups: control, PRP, and PRP-T, which were planted in 96 wells (5 × 103 each well). The VEGF-A expression of hDPSCs was analyzed by using an ELISA test and observed at 24, 48, and 72 hours. Statistical Analysis This study was performed by using one-way ANOVA (p < 0.05) test. Results There were significant differences between all groups (p < 0.05) at 48 and 72 hours of observations, and no significant differences in the PRP and PRP-T groups at 48 and 72 hours of observations (p > 0.05). Conclusion PRP and PRP-T were equally effective in inducing VEGF-A expression of hDPSCs.

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