Papers by Keyword: Absorbency

Abstract: MoO₃ film is successfully prepared by water bath heating method. The existence of Mo element in the MoO₃ solution is determined by infrared test. The characteristic peak of Mo element roughly appears within the range from 500 cm^–1 to 700 cm^–1.Then the MoO₃ peak is found appearing at the location of the 30°–40° using XRD, which proves the existence of MoO₃ in the solution. SEM observations indicate that the MoO₃ film is smooth as the reaction continues for 4 h. Finally, the results of light absorption test show that MoO₃ film has a good absorbency.

Abstract: We measured the microwave and millimeter-wave behaviors of ceramics and metal powders as a basis for developing microwave and millimeter-wave heating technology. In this study, nitride powders were subjected to microwave absorption measurements at elevated temperature. These measurements were performed using a system comprising a vector network analyzer, a circular wave-guide fixture, and a vacuum furnace. The sample’s microwave absorbency was evaluated by the change in reflection power from the sample in the circular wave-guide fixture under vacuum heating. Measurements were performed at approximately 24 GHz and at temperature up to approximately 1100°C. Boron nitride (BN) exhibited almost no absorption of microwaves up to 1100°C, similar to the results of a low-loss oxide powder such as alumina. Dichromium mononitride (Cr2N) powder exhibited a rather high absorption of microwaves at room temperature. During vacuum heating, absorbency of Cr2N started to decrease at 300°C, and became almost zero at temperature greater than 600°C, similar to the behavior of iron powder. This result indicated that roughly packed Cr2N powder absorbs microwave radiation; however, during vacuum heating, the compact body was sintered and the whole sample body became a reflector of microwaves. This change was irreversible, and the sample maintained its reflection behavior upon the cooling. When a mixed powder of Cr2N (20 mass%) and Al2O3 was heated under vacuum, the compact sample exhibited microwave absorption that increased with increasing temperature. This change was reversible upon cooling. These results indicated that the mixed powder did not become reflector of microwaves; Cr2N particles were not electrically connected each other because the Al2O3 particles kept the Cr2N particles separate during the vacuum heating process.

Abstract: Paper surface efficiency (PSE), a paper property integrating gloss and absorbency, can be used to evaluate color reproduction after the interaction of paper and ink. But it was shown that the color reproduction was still related to paper whiteness in practice. In this paper, an assumed PSE formula which integrates gloss, whiteness and ink absorbency is firstly presented, and according to experimental data, it can be well forecasted that the change of these principal paper properties would affect color reproduction result via the new PSE formula. The linear relationships between new PSE formula and ink color reproduction based the description of photo-density measurement were studied subsequently. The results showed that new PSE formula can be used to predict effectively ink color effect.

Abstract: Paper surface efficiency (PSE), a paper property integrating gloss and absorbency, can be used to evaluate color reproduction after the interaction of paper and ink. But it was shown that the color reproduction was still related to paper whiteness in practice. In this paper, an assumed PSE formula which integrates gloss, whiteness and ink absorbency is firstly presented, and according to experimental data, it can be well forecasted that the change of these principal paper properties would affect color reproduction result via the new PSE formula. The linear relationships between new PSE formula and ink color reproduction based the description of photo-density measurement were studied subsequently. The results showed that new PSE formula can be used to predict effectively ink color effect.

Abstract: Based on the carboxymethyl reaction of the medical cotton gauze, the paper analyzed absorbency and strength of the carboxymethyl medical cotton gauze. According to different concentrations of sodium hydroxide, molar ratio of sodium hydroxide and chloroactic acid, and mass ratio of chloroactic acid and cotton gauze, we found the best conditions on the excellent absorbency and strength of the carboxymethyl medical cotton gauze. It`s shown that, when the concentration of sodium hydroxide is 20%, the molar ratio of sodium hydroxide and chloroactic acid is 2.7:1, and the mass ratio of chloroactic acid and cotton gauze is 1.5:1, the substitution degree of the carboxymethyl cotton gauze will be 0.2132, the water absorption will be 370.5%, the salt absorption will be 292.3% and the breaking force will be 181.8N. After the carboxymethyl reaction of proper condition, the cotton gauze possesses the excellent mechanical properties based on the good absorbency.

Abstract: Paper surface efficiency (PSE), a paper property integrating gloss and absorbency, can be used to evaluate color reproduction after the interaction of paper and ink. But it was shown that the color reproduction was still related to paper whiteness in practice. In this paper, an assumed PSE formula which integrates gloss, whiteness and ink absorbency is firstly presented, and according to experimental data, it can be well forecasted that the change of these principal paper properties would affect color reproduction result via the new PSE formula. The linear relationships between new PSE formula and ink color reproduction based the description of photo-density measurement were studied subsequently. The results showed that new PSE formula can be used to predict effectively ink color effect.

Abstract: In this study Eupatorium adenophorum was evaluated as potential raw materials for Water-Absorbent Composite (WAC) synthesized with acrylic acid (AA) and acrylamide (AM) in aqueous medium. Factors, such as weight ratio of AA/AM to dry powdered Eupatorium adenophorum (DPEA), the amount of initiator and cross-linker, neutralization degree of AA, which influence water-absorbent capacity of WAC, were investigated. Additionally, the performances of WACs were appraised in term of water absorbency. The results showed that the nearly optimal WAC was obtained with absorbencies of 933 g/g in deionized water and 310 g/g in 0.9 wt% NaCl aqueous solution. Furthermore, the optimum super-absorbent has been proved with expectant polymerization structures and the morphological features via Fourier Transform Infrared Spectroscopy (FT-IR), X-Ray Diffraction (XRD) and Scanning Electric Microscopy (SEM).

Abstract: The absorbencies of poly(acrylic acid-co-acrylamide) (PAAM) are measured for the ion strengths of the salt solutions using the self-made PAAM by inverse suspension polymerization. The effects of various salt solutions on the swelling properties were studied systemically, and the relationship between the absorbency (Q) of PAAM and the concentrations of different salt solutions(c) could be expressed as Q=kcⁿ. The absorbencies of PAAM decrease obviously with the ion strengths (less than 0.03mol/kg) and had no great change when the ion strengths were higher than 0.03mol/kg for the same solution systems. The absorbency decreased with an increase in charge of the metal cation. The absorbencies of the PAAM in the sodium solutions with different anion decreased with an increase of the ion strengths. However, the absorbencies increased with the increase in charge of the anionic group and were in order PO₄^3->CO₃^2->Cl^-.

Abstract: Offset paper properties have great influence on the quality of print matter. Eleven offset paper samples were printed by IGT printability tester, then the density and L*a*b values of printed samples were measured. The relationship between paper properties and optical density or color gamut of paper printed was studied. The results show that main density increases with the increased ink quantity before the main density reaches saturation, the saturation density becomes greater with increased ink absorbency. When the smoothness is larger, lower ink quantity is needed for reaching saturation density, and larger color gamut is obtained. This study will provide references for the paper making and printing enterprises.

Abstract: In this paper, we created some microstructures on the surface of silicon by irradiating a silicon wafer for soalr cell with trains of short pulses in the presence of an ambient gas.The laser pulse produced by TEA CO2 laser is high power and shorter than a microsecond in duration. We found that the morphology of the structures is highly dependent on the species of ambient gas and the number of laser pulses used. I note that surfaces covered with these microstructures have striking optical properties: structures absorb approximately 90% of incident light with wavelengths between 250 nm and 0.85μm.The remarkable and potentially useful optical properties of the structures should be beneficial in increasing the efficiency of crystalline silicon soalr cell.