1,720,984 research outputs found
Synthesis and characterization of silver-titanium dioxide nanomaterials via horizontal vapor phase growth (HVPG) technique for antibacterial applications
No full textSynthesis of different nanomaterials can be produced using several methods. This study provides the synthesis of Silver-titanium dioxide nanocomposite materials using Horizontal Vapor Phase Growth (HVPG) technique.
The two parameters to be considered in the study for the synthesis of Silver-titanium dioxide uses HVPG technique are temperature growth and baking time. The temperature will have varied using values of 800°C, 1000°C, and 1200°C where the baking time growth from 4 hours, 6 hours, and 8 hours. The quartz tubes with Silver-titanium dioxide nanomaterial were characterized using a Scanning Electron Microscope (SEM) and an Energy Dispersive X-ray (EDX) for surface morphology, elemental and atomic composition. The SEM images shows that nanomaterials were successfully grow using HVPG technique and were able to produce nanostructures (e.g. nanoparticles, nanospheres, nanorods, and nanotriangulars).
The temperature growth, baking time, and diameter of the nanomaterial was analyzed using JMP Analysis of Variance (ANOVA) software based from SEM images measurement from each zone. The study successfully determined the equation of the diameter of the nanomaterial in relation to temperature growth and baking time. Moreover, JMP ANOVA Software was able to produce a graph profiler based on designed temperature growth and baking time.
The results reveal that the best result of temperature growth and baking time was analyzed to be 1000°C with 8 hours due to a majority of nanostructures is in nanorods. Atomic Force Microscopy (AFM) determines the mechanical properties of Silver-titanium nanocomposite materials which are include the Surface roughness, Hardness, and Reduce Youngs Modulus.
The pour plate technique was used for bacterial test and successfully determined the efficiency of the materials to eradicate the bacteria with the Silver-titanium dioxide nanocomposite material that contains 50% Ag and 50% Titanium dioxide. The bacterial test used was Staphylococcus aureus
Effect of Environmental Moisture on Surface Roughness of FDM and SLA Fabricated Components
Full text linkThis study aims to analyze the surface characteristics and moisture contents of three different 3D printed materials, namely Polylactic Acid (PLA) filament, bio-based resin, and standard translucent resin, produced using two distinct manufacturing processes: Fused Deposition Modelling (FDM) for filament materials and Stereolithography (SLA) for resin material. The moisture content was measured using a Moisture Analyzer, and surface characteristics were examined by capturing images through a digital microscope. The results of the moisture content measurement indicated that all three materials exhibited hydrophobic properties with low water content under similar treatments. Among the materials, bio-based resin demonstrated the highest moisture content of 1.53%, followed by translucent resin with 1.26%, and PLA filament with 1.11%. Furthermore, a correlation between applied temperature and moisture content was observed, with translucent resin showing the most stable results, consistently increasing with higher temperatures. In contrast, bio-based resin and PLA filament exhibited unstable behaviours. Surface observation using surface roughness and the digital microscope revealed distinct patterns for the two manufacturing processes. For resin specimens, defects on the surface were evident at lower temperatures and increased with rising temperature. In contrast, PLA filament demonstrated a different surface change pattern, characterized by material melting, leading to a smoother surface. In conclusion, this study sheds light on the surface characteristics and moisture content of 3D printed materials produced through different manufacturing processes. The findings highlight the importance of material selection and processing parameters in achieving desired material properties for various applications in 3D printing
Load-displacement experimental data from axial tensile loading of CFRP-SPCC hybrid laminates
No full textThe current paper shows a data set of load-displacement output from axial tensile loading of CFRP-SPCC hybrid laminates. The specimen geometries are cut based on standard procedure from ASTM D-3039. At least 3 positions in each specimen, we measured its width and thickness. Data of the load and displacement were repeated at least 3 samples in each combination of hybrid laminates. Tensile test was conducted with a 1 mm/min of loading rate. The data were recorded from unloading until failure of specimens. The data gives information about the highest load and the behavior of load-displacement in axial tensile loading. By using width and thickness, normalized data can be obtained, the load can be calculated into stress (MPa) unit. The data are useful for researchers and structural engineers that deals with CFRP, SPCC, and hybrid CFRP-SPCC laminates. © 2020 The Author
A standard method to synthesize Ag, Ag/Ge, Ag/TiO2, SnO2, and Ag/SnO2 nanomaterials using the HVPG technique
No full textNanotechnology is growing rapidly in the past few decades with the applications in several fields such as medicine, environment, energy, electronics, automotive, and aerospace. There are many methods used by researchers to synthesize nanomaterial. In this paper, Horizontal Vapor Phase Growth (HVPG) technique was successfully used to synthesize various nanomaterial and nanocomposite materials such as Ag, Ag/Ge, Ag/TiO2, SnO2, and Ag/SnO2. HVPG technique used a one-pot step to synthesize nanomaterials with 100 % purity of the results, affordable cost, and environmentally friendly. The method has two variables; growth temperature and curing time. Changing the variables create different shapes of nanomaterials. It also reported that the technique could be used to synthesize various nanomaterials consists of single or multi-material. This detailed method demonstrates the capability of the HVPG technique to synthesize nanomaterials, not only to grow the single shape of nanomaterials but also allow other nanomaterial shapes to grow in different parameter conditions. • HVPG technique successfully used to synthesize various nanomaterials. • Only 2 parameters used; curing time and growth temperature. • Purity result (100 %) with no pollutant. © 2019 The Author(s
Comprehensive evaluation of CFRP laminates using NDT methods for aircraft applications
No full textThe evaluation of carbon fiber reinforced polymers (CFRP) laminates during and after the Mode I test was successfully conducted, integrating non-destructive testing of acoustic emission (AE) and ultrasound scanning. Two different specimens [+45°/-45°/0°]2S and [0°/+45°/-45°]2S were used to detect the effects of stacking sequences of the laminates. Results indicated that applying AE sensors to the specimens slightly affect to the laminate performance. Thus, the laminates are validated and showed that for [+45°/-45°/0°]2S laminates, the system can withstand load and increase the displacement at break more than twice of [0°/+45°/-45°]2S laminates. Moreover, the ultrasound scanning showed that the crack trace is visible. [+45°/-45°/0°]2S laminates have smaller crack around 24 mm compared to [0°/+45°/-45°]2S laminates with 30 mm. Image analysis revealed that after specimen are forced to open, the [+45°/-45°/0°]2S laminates can prevent long crack compared to [0°/+45°/-45°]2S laminates. The double cantilever beam (DCB) test, employing various stacking sequences, demonstrated excellent examination results using non-destructive testing. Theoretical calculations regarding residual thermal expansion due to different coefficients of thermal expansion also revealed a slight impact of varying manufacturing temperatures on the laminates. These findings offer valuable insights for detecting, predicting, and preventing specimen failures in aircraft and aerospace structures without resorting to destructive examinations, facilitating appropriate preventive maintenance
Earthing Method as Lifestyle Medicine to Reduce Hypertension in Pregnancy in Surakarta City, Central Java, IndonesiaEarthing Method as Lifestyle Medicine to Reduce Hypertension in Pregnancy
No full textHypertension in pregnancy is among the three highest complications in 1 in 10 pregnant women. It is a significant cause of morbidity and mortality for mothers and babies (including seizures and low birth weight (LBW)). Earthing or grounding is a direct contact therapy between the body and the earth's surface (soil, grass, sand or stone), which allows the free transport of electrons from the earth's surface to spread to the body through the skin. The research objective was to analyze the effect of Earthing on hypertension in pregnancy. The research design was a pre-experimental with a one-group pretest and posttest, designed for one year of study. The population of pregnant women with hypertension in Surakarta City, Central Java, with the sampling technique used was purposive sampling, recruiting 20 respondents. Earthing duration 1 hour every day for 30 days. The statistical analysis results in a P-value of 0.000, t-count 25.065>t-table 2.093, for systolic blood pressure and P-value 0.000, t-count 93.05>t-table 2.093 for diastolic blood pressure. It indicates a significant difference in pregnant mothers' systolic and diastolic blood pressure before and after Earthing. It is recommended for mothers to perform Earthing or grounding as a lifestyle medicine at home by placing bare feet on the soil every day for 1 hour. It is beneficial to do Earthing/grounding throughout the pregnancy or by using Earthing device that connects the electrons in the earth to the skin
Dataset of material measurement based on SEM images of Ag/TiO2 nanocomposite material synthesized via Horizontal Vapor Phase Growth (HVPG) technique
No full textThis data describes about the measurement technique of Ag/TiO2 nanocomposite materials that successfully synthesized via Horizontal Vapor Phase Growth (HVPG) technique. The data are obtained after specimens were placed in the Scanning Electron Microscope (SEM) chamber to be analyzed. The present data were captured from SEM with different magnification. There are total 27 variable data to be analyzed from three different parameters; growth temperature, baking time and zones. In total, 9 different quartz tubes that contains of Ag/TiO2 nanocomposite material are evaluated. Data are described in average value where the different calculations are presented. Raw data are also embedded in the Appendix for further analysis purposes. These data can be useful as the information of size measurement of Ag/TiO2 nanocomposite materials in different temperature and time during synthesis process. © 2020 The Author(s
Failure Prediction and Surface Characterization of GFRP Laminates: A Study of Stepwise Loading
No full textThe present study explores the failure and surface characteristics of Glass Fiber-Reinforced Polymers (GFRP). Stepwise loading was applied in this study to understand the multi-static loading effect on the laminates before final failure. The loading was set three times to reach 10 kN with loading–unloading movement before final load until failure. The results showed that the angle of the GFRP UD laminates’ position significantly impacts the system’s failure. The results were analyzed using theoretical calculation experiment analysis, and then the failure sample was identified using ASTM D3039 standard failure. The laminates with 0° layer on edge ([0/90]S laminates) underwent preliminary failure before final failure. The mechanism of stepwise loading can be used to detect the effect of preliminary failure on the laminates. The [0/90]S laminates are subjected to stress concentration on the edge due to fiber alignment and discontinued fibers in the 0-degree direction. This fiber then fails due to debonding between the fiber and the matrix. The laminates’ strength showed that [90/0]S specimens have an average higher strength with 334.45 MPa than the [0/90]S laminates with 227.8 MPa. For surface roughness, the value of Ra increases more than six times in the 0° direction and three times in the 90° direction. Moreover, shore D hardness showed that the hardness was decreased from 85.6 SD then decreased to 70.4 SD for [0/90]S and 65.9 SD for [90/0]S. The matrix debonding, layer delamination and fiber breakage were reported as the failure mode behavior of the laminates
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