Journal articles: 'Hot stage microscope'

1

Rosenband, Valery, and Alon Gany. "TESTING OF METAL POWDERS BEHAVIOR IN A HOT STAGE MICROSCOPE." International Journal of Energetic Materials and Chemical Propulsion 5, no. 1-6 (2002): 377–83. http://dx.doi.org/10.1615/intjenergeticmaterialschemprop.v5.i1-6.410.

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Sarvaranta, L. "Shrinkage of short PP and PAN fibers under hot-stage microscope." Journal of Applied Polymer Science 56, no. 9 (May 31, 1995): 1085–91. http://dx.doi.org/10.1002/app.1995.070560908.

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Howe, James M. "In Situ hot-stage high-resolution Transmission Electron Microscope studies of the mechanisms and kinetics of precipitation reactions." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 228–29. http://dx.doi.org/10.1017/s0424820100137513.

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In situ hot-stage high-resolution transmission electron microscopy (HRTEM) provides unique capabilities for quantifying the mechanisms and kinetics of precipitation reactions at the atomic level. Such information is required to understand phase transformations and the behavior of material interfaces. This paper provides a brief summary of the in situ hot-stage HRTEM technique and illustrates the use of this technique to obtain information about heterogeneous nucleation processes in precipitation and crystallization reactions. Examples of other types of in situ HRTEM studies can be found in previous papers by Sinclair et al. and Howe et al.The specimen and microscope requirements for in situ hot-stage HRTEM are the same as those for static HRTEM except that one must have a hot-stage specimen holder and equipment for recording and analyzing dynamic images. A high-resolution television-rate camera connected to a standard videocassette recorder (VCR) can be used to store hours of data for low cost. The dynamic images can then be analyzed directly during playback or sent to a computer for image processing and analysis.

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Howe, J. M. "Quantitative in situ hot-stage high-resolution Transmission Electron Microscopy." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 758–59. http://dx.doi.org/10.1017/s0424820100171523.

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In situ hot-stage high-resolution transmission electron microscopy (HRTEM) provides unique capabilities for quantifying the dynamics of interfaces at the atomic level. Such information complements detailed static observations and calculations of interfacial structure, and is essential for understanding interface theory and solid-state phase transformations. This paper provides a brief description of particular requirements for performing in situ hot-stage HRTEM and illustrates the use of this technique to obtain quantitative data on the atomic mechanisms and kinetics of interface motion during precipitation of {111} θ phase in an Al-Cu-Mg-Ag alloy.The specimen and microscope requirements for in situ hot-stage HRTEM are not much different from those of static HRTEM, except that one must have a heating holder and equipment for recording and analyzing dynamic images. At present, most HRTEMs are equipped with a TV-rate camera, possibly combined with a charge-coupled device camera. An inexpensive way to record in situ HRTEM images is to send the output from the TV-rate camera directly into a standard VHS format videocassette recorder (VCR).

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Romankiewicz, Remigiusz. "The Study of the Tensile Strength of AlSi21CuNiMg Silumin in the Final Stage of Solidification and the Initial Stage of Cooling." Journal of Casting & Materials Engineering 3, no. 3 (September 30, 2019): 57–61. http://dx.doi.org/10.7494/jcme.2019.3.3.57.

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The paper presents the results of tensile strength tests of AlSi21CuNiMg silumin made on a test stand. Silumin was under examination in an unmodified state and after modification with AlCu19P1.4 master alloy in quantity of 0.2% in relation to the mass of the alloy. Using a scanning microscope, the surface fractures obtained from tensile tests were tested. The structure and profiles of fractures were examined using an optical microscope. Modification of the tested silumin resulted in a favorable fragmentation and regular distribution of the crystals of the primary silicon in the alloy structure, which led to an almost twofold increase in the strength of the silumin samples at the final solidification stage from 3.5 to 6.6 MPa. As a result of these changes, the resistance of silumin to hot cracks should increase, which is of great importance when casting hypereutectic silumin in a metal mould that strongly inhibits the shrinkage of the castings.

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Park, C., T. E. Shultz, and I. Dutta. "Environmentally protected hot-stage atomic force microscope for studying thermo-mechanical deformation in microelectronic devices." Review of Scientific Instruments 75, no. 11 (November 2004): 4662–70. http://dx.doi.org/10.1063/1.1809262.

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Betrabet, H. S., J. K. McKinlay, and S. M. McGee. "Dynamic observations of Sn-Pb solder reflow in a hot-stage environmental scanning electron microscope." Journal of Materials Science 27, no. 15 (1992): 4009–15. http://dx.doi.org/10.1007/bf01105097.

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Chen, S. H., C. B. Carter, and C. J. PalmstrΦm. "Lateral diffusion in Ni–GaAs couples investigated by transmission electron microscopy." Journal of Materials Research 3, no. 6 (December 1988): 1385–96. http://dx.doi.org/10.1557/jmr.1988.1385.

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A method has been devised for preparing lateral Ni–GaAs diffusion couples for transmission electron microscopy investigations. By annealing diffusion couples in situ in a hot stage, the growth of a ternary phase has been observed in the microscope, and shows parabolic time dependence of the growth. In the temperature range of 200–300 °C, Ni is the predominant diffusing species in the ternary phase while Ga and As are essentially immobile. The experimental results are compared with previous investigations of the reactions of Ni thin films with bulk GaAs.

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Ma, Qing Lan, and Yuan Ming Huang. "Dependence of the Morphology of Polymer Dispersed Liquid Crystal on Temperature." Materials Science Forum 663-665 (November 2010): 804–7. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.804.

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Polymer dispersed liquid crystal film was prepared by the method of polymerization induced phase separation. The optical morphologies of the PDLC film were characterized by polarized optical microscope with a hot stage. Our results demonstrated that the morphology of the PDLC film depended on temperature of PDLC system.

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Stapley, Andrew G. F., Chrismono Himawan, William MacNaughtan, and Timothy J. Foster. "A Computational Method for Extracting Crystallization Growth and Nucleation Rate Data from Hot Stage Microscope Images." Crystal Growth & Design 9, no. 12 (December 2, 2009): 5061–68. http://dx.doi.org/10.1021/cg9000413.

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Belal, A. E., A. A. Hamza, T. Z. N. Sokkar, K. A. El-Farahaty, and K. M. Yassien. "Opto-thermal behavior of polypropylene fibres using a modified hot-stage attached to the interference microscope." Polymer Testing 21, no. 8 (2002): 877–82. http://dx.doi.org/10.1016/s0142-9418(02)00022-3.

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12

Smith, Ronald W. "The Staining of Polymers." Microscopy Today 10, no. 5 (September 2002): 5–7. http://dx.doi.org/10.1017/s1551929500058272.

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In the beginning there was water-the first stain that delineated structure within a polymeric system. The polymerwas natural rubber (NR) and the system was an air-dried film of natural latex. Grenquist reported in 1929 that a dried film of natural rubber latex soaked in hot water became milky (Figure 1) and, at that stage, the latex particles could be detected by the optical microscope (OM), The contrast mechanism was provided by the absorption of water by the naturally occurring proteinaceous layers present on the congealed NR particle surfaces. There was little demand for polymer staining until the age of electron microscopy.

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Noll, Andreas, and Nicole Knoer. "Crystallization Behaviour of TiO₂ Nanoparticle Reinforced Polypropylene." Materials Science Forum 636-637 (January 2010): 688–96. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.688.

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Composites of isotactic polypropylene (iPP) with different TiO2 nanoparticle loads (0.5 vol.%, 2 vol.% and 4 vol.%) were compounded by optimized twin screw extrusion. The crystallization behaviour of these semicrystalline nanocomposites was examined by differential scanning calorimetry (DSC), scanning electron microscope (SEM) and polarized optical light microscope (POM) combined with a hot stage module to pursue in-situ the structure development. Wet chemical etching was applied to highlight morphological details like spherulites and lamellar structures for SEM observations. An obvious influence of TiO2-nanoparticles on the crystallization could be verified.

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NATISHAN, M. E., J. C. POWELL, and K. E. BEATTY. "IN SITU STUDY OF SOLDER PASTE BEHAVIOR DURING REFLOW USING THE HOT-STAGE ENVIRONMENTAL SCANNING ELECTRON MICROSCOPE." Journal of Electronics Manufacturing 07, no. 01 (March 1997): 29–40. http://dx.doi.org/10.1142/s096031319700004x.

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JONES, F., and K. PATTERSON. "Observation of Aqueous Dye Dispersions at High Temperature I - Construction of a Simple Microscope Pressure Hot Stage." Journal of the Society of Dyers and Colourists 92, no. 12 (October 22, 2008): 442–44. http://dx.doi.org/10.1111/j.1478-4408.1976.tb03269.x.

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16

Ji, He Fei, Jiang Rong Yang, Gui Chao Hu, and Chun Li Jiang. "Growth Characteristics of Hydride for Aging Treated U-5.5wt.%Nb Alloy." Advanced Materials Research 881-883 (January 2014): 87–92. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.87.

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The hydriding behavior of as-quenched U-5.5Nb alloy followed by 400 °C×3h aging treatment has been studied at 100 °C with the hydrogen pressure specially chosen at 1.0 bar. The pitting and initial growth of hydride was in-situ monitored by hot stage microscope. The morphology and positions of hydrides on sample surface were then carefully studied by the laser scanning confocal microscope (LSCM) and scanning electron microscope (SEM) which were also applied for investigating the microstructure changes before and after the aging treatment. It is clearly found that the acicular phase all over the metal matrix caused by the 400 °C, 3 hr heat-treatment determined the preferential growth of the hydride in specific directions.

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Guo, Yan Fen, You Ji Tao, Gan Xin Jie, Jun Wang, Xiao Dong Zhang, Li Fen Hu, and Xin Liu. "Degradation Behavior of Pure Polystyrene Subjected to Two Natural Climate Types and the Simulated Effect of Artificial Accelerated Weathering." Applied Mechanics and Materials 713-715 (January 2015): 2632–39. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2632.

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Pure polystyrene (PS) was subjected to natural weathering in Qionghai (QH) and Ruoqiang (RQ) of China, representing hot and humid climate and xerothermic climate respectively. The degradation profile of pure PS was studied by Fourier Transform Infrared (FTIR) Spectroscopy, Differential Scanning Calorimetry (DSC), Scanning Electron Microscope (SEM), X-ray Photoelectron Spectroscopy (XPS) and Spectrophotometer. Artificial accelerated weathering tests protocol A and B were carried out to simulate hot and humid climate and xerothermic climate respectively. Results show that pure PS degrade slowly at the initial stage and then become faster. Color shift could be an appropriate indicator for evaluating simulated effect of artificial accelerated weathering and protocol A simulate hot and humid climate perfectly while protocol B turns out weak for xerothermic climate.

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Hangen, Ude, Heidi Bögershausen, and Gerhard Sauthoff. "Untersuchung einer Ni 63,5Al 63.5-Legierung im Heiztischmikroskop / Investigation of Ni 63,5Al 63.5Alloy in the Hot Stage Microscope." Practical Metallography 33, no. 10 (October 1, 1996): 531–39. http://dx.doi.org/10.1515/pm-1996-331006.

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McKernan, Stuart. "Environmental Scanning Electron Microscopy: - Advantages and Disadvantages." Microscopy and Microanalysis 3, S2 (August 1997): 381–82. http://dx.doi.org/10.1017/s1431927600008795.

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The possibility of performing scanning electron microscopy under “environmental” conditions (ESEM); where the specimen does not have to be under high-vacuum conditions, or even coated to make it conductive, has existed for several years[l]. Several different flavors of environmental scanning electron microscope now exist, as well as a newer generation of microscope which is capable of imaging at very low accelerating voltages. Techniques for rapidly freezing hydrated specimens and obtaining very high resolution images from them in the SEM have also been improved recently. As a result of all this innovation, it is now possible to examine many classes of specimens in the SEM that were previously thought to be impossible to image (or at least not worthwhile frying).Among the advantages of the environmental SEM are the fact that images of non-conductive surfaces can be obtained without the necessity for additional sample coating. This can be especially important in dynamic experiments, and hot-stage work, where the presence of a surface coating may substantially affect the samples behavior

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Tseronis, D., I. F. Sideris, C. Medrea, and Ionel Chicinaş. "Microscopic Examination of the Fracture Surfaces of an H 13 Hot Extrusion Die due to Failure at the Initial Usage Stage." Key Engineering Materials 367 (February 2008): 177–84. http://dx.doi.org/10.4028/www.scientific.net/kem.367.177.

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This paper studies the fracture surfaces of an aluminium hot extrusion die that broke down during operation. The die was constructed, from H13 steel and was intended for the production of 60,000 Kg of aluminium profile. The male part fractured during operation after the production of 500 Kg profile. Initially, the machine and thermal treatments that were applied for construction of the die were collected and studied. The die was carefully inspected visually with a stereoscope. The fracture surfaces, some cracks, and the structure that was not affected by the failure, were investigated by optical microscopy. The thickness, quality and homogeneity of the nitrated layers were inspected. Additional information concerning the fracture was obtained by examining a primary crack using a scanning electron microscope and chemical analysis of the material was made using EDX attachment. The paper reports on some interesting observations relating to the fractured component, the type of the fractures, and the quality of the heat treatments, and presents some of the probable causes that led to the premature failure of the die.

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Puyathorn, Napaphol, Takorn Chantadee, Setthapong Senarat, and Thawatchai Phaechamud. "Characterization of Lauric Acid Precipitated from Biocompatible Solvents." Key Engineering Materials 819 (August 2019): 209–14. http://dx.doi.org/10.4028/www.scientific.net/kem.819.209.

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Water resistance of lauric acid (L) dissolved in biocompatible solvents mainly depended on the water affinity of solvent. L in DMSO (DL) was most sensitive to water and higher than L in N-methyl pyrrolidone (NL) and L in 2-pyrolidone (PL), respectively. From scanning electron microscope, differential scanning calorimetry, thermogravimetric analysis, powder x-ray diffractometry and hot stage microscope tests revealed the alteration of L crystal owing to the interference by solvent during precipitation. All L precipitates had lower melting point and degradation temperature than intact L in which L precipitated from 2-pyrrolidone exhibited the lowest melting temperature. These characteristics will be useful for modifying L in phase inversion in situ forming gel.

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Akin, Y., R. E. Goddard, W. Sigmund, and Y. S. Hascicek. "In-Situ Study of NiO Growth on Textured Nickel Tape Using Environmental Scanning Electron Microscope (ESEM) and Hot Stage." Microscopy and Microanalysis 7, S2 (August 2001): 1276–77. http://dx.doi.org/10.1017/s1431927600032451.

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Deposition of highly textured ReBa2Cu3O7−δ (RBCO) films on metallic substrates requires a buffer layer to prevent chemical reactions, reduce lattice mismatch between metallic substrate and superconducting film layer, and to prevent diffusion of metal atoms into the superconductor film. Nickel tapes are bi-axially textured by cold rolling and annealing at appropriate temperature (RABiTS) for epitaxial growth of YBa2Cu3O7−δ (YBCO) films. As buffer layers, several oxide thin films and then YBCO were coated on bi-axially textured nickel tapes by dip coating sol-gel process. Biaxially oriented NiO on the cube-textured nickel tape by a process named Surface-Oxidation- Epitaxy (SEO) has been introduced as an alternative buffer layer. in this work we have studied in situ growth of nickel oxide by ESEM and hot stage.Representative cold rolled nickel tape (99.999%) was annealed in an electric furnace under 4% hydrogen-96% argon gas mixture at 1050°C to get bi-axially textured nickel tape.

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Meinhardt, Jürgen, Tobias Woyke, Friedrich Raether, and Andreas Kienzle. "Measurement and Simulation of the Oxidation of Carbon Fibers and C/SiC Ceramic." Advances in Science and Technology 45 (October 2006): 1489–94. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1489.

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The fracture toughness increases but the long-term oxidation resistance of carbon short fiber reinforced C/SiC composites decreases if the volume fraction of carbon fibers is high. To understand the oxidation kinetic and their dependence from the C/SiC microstructure the composites and also the used carbon short fiber bundles were investigated by a thermo balance and by scanning electron microscopy. Additionally the oxidation of single carbon short fibers was measured in situ by a hot stage light microscope. To simulate oxidation kinetics a software program using Finite Element methods was developed. Below 800 °C oxidation resistance can be improved by increasing the degree of graphitization of the carbon material within the short fiber bundles. Above 800 °C the number of junctions between the short fiber bundles has to be reduced.

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Labun, P. A., P. A. Crazier, and T. Suzuki. "Transmission electron microscopy studies of Bi-substituted garnet films." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 774–75. http://dx.doi.org/10.1017/s042482010008818x.

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Bi-substituted garnet films have attracted much attention as possible materials for high density magneto-optical recording media. Recently a new rapid thermal annealing technique has been developed to produce garnet films with improved microstructural and magnetic properties. We have employed in-situ heating in an analytical electron microscope to characterize the microstructural changes to the morphology and chemistry during thermal annealing of garnet films.Garnet films were produced by an r.f. magnetron sputter deposition method in an Ar atmosphere. The nominal composition of the films was (BiDy)3(FeGa)5O12 with a thickness of ∼ 40 nm. The films were transferred into the hot stage of a Philips 400T transmission electron microscope and heated to a maximum temperature of 720 C. Different rates were used to simulate the effect of heat pulsed annealing.

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Diaz, F. A., E. J. Gutierrez, B. A. Foster, P. T. Hardin, and K. R. Bondioli. "114 Effect of in vivo heat stress on DNA methylation and DNA hydroxymethylation of bovine oocytes." Reproduction, Fertility and Development 31, no. 1 (2019): 183. http://dx.doi.org/10.1071/rdv31n1ab114.

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Cattle under the effect of heat stress have reduced fertility, with negative effects on the oocyte observed at the morphological, biochemical, transcriptional and developmental levels. There are no studies evaluating the effect of heat stress on the epigenetic profile of bovine oocytes, which plays a fundamental role in the regulation of gamete development. The objective of this study was to evaluate the effect of in vivo heat stress during the spring to summer transition on DNA methylation and DNA hydroxymethylation of bovine oocytes at the germinal vesicle (GV) and metaphase II (MII) stages. Ten Bos taurus crossbred nonlactating beef cows located at Saint Gabriel, Louisiana, USA (30°16′11.1″ N, 91°06′12.1″ W), were used for oocyte collection once monthly from April to August. Dominant follicle removal was performed 5-7 days before oocyte collection. Cumulus-oocyte complexes were collected through ovum pick-up from follicles >2mm. Germinal vesicle (GV)-stage oocytes (50% of total obtained per cow) were subjected to a standard bovine in vitro maturation protocol to obtain metaphase II (MII) stage oocytes. The DNA methylation and DNA hydroxymethylation of GV and MII oocytes was assessed by fluorescence immunohistochemistry utilising primary antibodies against 5′-methylcytosine and 5′-hydromethylcytosine. Secondary antibodies utilised were Alexa Fluor 488 goat anti-mouse IgG and Alexa Fluor 546 donkey anti-rabbit IgG. Oocytes were visualised utilising a fluorescence deconvolution microscope and immunofluorescence data were expressed as corrected relative fluorescence per nucleus. The polar body was not included for fluorescence quantification when evaluating MII stage oocytes. Results (least squares means±standard error) were evaluated as cold months (April and May) and hot months (June, July, and August). Results were analysed by the type III test of fixed effects and Tukey media separation utilising Proc Glimmix of SAS 9.4 (P<0.05; SAS Institute Inc., Cary, NC, USA). Maturation rates and percent of grade 1, grade 2, and grade 3 oocytes were square root arcsine transformed for statistical analysis. The number of total oocytes obtained per cow was higher in cold compared to hot months (21.88±2.34 and 14.23±2.17, respectively). Percent of grade-1 oocytes was higher in cold compared to hot months (38.25±3.69 and 27.59±3.09, respectively). There was no difference in percent of grade-2 oocytes between cold and hot months (21.80±2.44 and 22.60±2.20, respectively). There was a lower percent of grade-3 oocytes in cold compared to hot months (39.82±4.54 and 55.87±3.98, respectively). Maturation rate (in vitro maturation) was not different between cold and hot months (81.92±4.04 and 91.11±3.36, respectively). There was no difference between cold and hot months in DNA methylation (417,218.90±71,793.86 and 313,819.88±55,528.01, respectively) and DNA hydroxymethylation (444,931.10±67,920.78 and 352,254.68±56,425.96, respectively) of GV-stage oocytes. There was no difference between cold and hot months in DNA methylation (87,122.36±14,449.47 and 89,807.26±11,303.72 AU, respectively) and DNA hydroxymethylation (102,933.83±15,517.70 and 137,622.45±11,826.86 AU, respectively) of MII-stage oocytes.

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Yodkhum, Kotchamon, and T. Phaechamud. "Thermal Analysis of Chitosan-Lactate and Chitosan-Aluminum Monostearate Composite System." Advanced Materials Research 506 (April 2012): 278–81. http://dx.doi.org/10.4028/www.scientific.net/amr.506.278.

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Chitosan possess many attractive properties for applying as biomaterials. For some application, biomaterial devices have to be sterilized using high temperature, e.g. stream sterilizing process. However, thermal degradation behavior of chitosan has been reported previously. Many researchers have attempted to improve thermal degradation behavior of chitosan by synthesize chitosan derivatives or blending chitosan with other polymers or additives. However, chitosan derivatives found to be less thermal stability than chitosan itself. On the contrary, adding some lipid additive could improve thermal stability of chitosan. In this study, protecting effect of aluminum monostearate (Alst) on thermal stability of chitosan was investigated employing thermal analysis techniques, e.g. thermogravimetry (TG), differential scanning calorimetry (DSC) and hot-stage microscope. Lactic acid solution (2% w/v) was used as solvent for dissolving chitosan. Chitosan solution, named as chtiosan-lactate (CL) and chitosan solution contained 2.5% w/w Alst (CLAlst) were prepared and fabricated into sponges using freeze drying technique. Degradation temperature of CLAlst system investigated from TG was shifted to the higher temperature comparing that of CL which indicated that Alst could improve thermal stability of chitosan after processed as biomaterial. From DSC result, small endothermic peak was observed around 60-70°C for CLAlst whereas that of CL did not exhibit any peak. Melting behavior of the sponges observed under hot-stage microscope was demonstrated that chitosan was decomposed whereas Alst dispersed in chitosan backbone was gradually melted.

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Ashton, Gage P., Lindsay P. Harding, and Gareth M. B. Parkes. "An Integrated Hot-Stage Microscope–Direct Analysis in Real Time–Mass Spectrometry System for Studying the Thermal Behavior of Materials." Analytical Chemistry 89, no. 24 (December 5, 2017): 13466–71. http://dx.doi.org/10.1021/acs.analchem.7b03743.

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Liu, Jiankun, Guanpeng Liu, Hua Ouyang, Yulong Li, Ming Yan, and Michael Pecht. "Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate." Materials 13, no. 20 (October 20, 2020): 4666. http://dx.doi.org/10.3390/ma13204666.

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The wetting kinetics of nickel-based filler metal (BNi2) over selective laser-melted Ti-6Al-4V (SLMed TC4) titanium alloy in a protective argon atmosphere is experimentally investigated using a real-time in situ hot stage equipped with an optical microscope. The spreading processes at different temperatures are similar, and the overall wetting/spreading process can be roughly divided into three stages: (i) an initial stage, (ii) a rapid spreading stage, and (iii) an asymptotic stage. Moreover, the wetting kinetics of the BNi2/SLMed TC4 system can be expressed by empirical power exponential function Rn~t with n = ~1. In the process of spreading, Ti-based solid solution (Ti(ss)) and intermetallic compound (Ti2Ni and TiB2) were formed at the interface within the reaction domain, and the phase transition of α’ martensitic to α-Ti and β-Ti also took place. The influence of elevated temperature on the spreading and wetting kinetics of the BNi2/SLMed TC4 system was studied, and the results show that the increase of temperature has a slightly promoting effect on the spreading, but a limited impact on the value of n. In addition, the spreading and wetting kinetics of BNi2/SLMed TC4 system are similar to those of BNi2 on conventional forged TC4 substrate.

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Kim, Yong Hwan, K. T. Kim, Seung Y. Shin, and S. I. Kwun. "Effect of Additive Powder on Microstructural Evolution in the Wide-Gap Brazed Region by In Situ High Temperature ESEM." Advanced Materials Research 26-28 (October 2007): 535–38. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.535.

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This study investigated the characterization of the additive powder on microstructural evolution during the heating of the powder mixture of additive and filler metal powder by in-situ high temperature environmental scanning electron microscopy (HT-ESEM) up to 1200°C. The IN738 powder (additive) and BNi-3 powder (filler metal) were used for wide-gap brazing process. A field emission gun environmental scanning electron microscope (XL 30 ESEM-FEG, FEI) equipped with a 1500°C hot stage was used for in-situ gaseous secondary electron imaging at high temperature (HT-ESEM image). The melting of filler metal powder initiated at 1224K and was spread on the IN738 additive powder with increasing temperature. After cooling, the IN738 additive powder was increased from 75μm to 100μm. It was found that the additive powder added to the wide-gap brazed region avoided the possibility of directional solidification.

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Ji, Shuai, Jing Tao Han, Jing Liu, and Xing Wen Yang. "Production of 6.5wt%Si Composite Thin Sheet by Cold Rolling Process." Advanced Materials Research 941-944 (June 2014): 354–59. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.354.

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Although 6.5wt% high silicon electrical steel has pretty excellent soft magnetic properties, it is hard to be obtained by cold rolling at room temperature, by virtue of appearance of ordered phases in this alloy. In this research we report that very thin 6.5wt%Si composite sheet with 0.05-0.08mm thickness was fabricated by proper heat treatment and cold rolling after hot deformation. The 6.5wt%Si composite plate exhibits some extent of ductility at room temperature when the stage of hot deformation was finished. The effect of heat treatment on mechanical properties of this composite plate was investigated by optical microscope. After heat treatment, ductility of this composite plate is increased due to the ordered DO3phase transformation inhibited by cooling fast. It is provided a referable method to produce 6.5wt% high silicon steel with conventional forming process.

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Wu, Shibo, Jiannan Chen, Daoping Peng, Zheng Wu, Qin Li, and Tao Huang. "Effects of Water Leaching on the Ash Sintering Problems of Wheat Straw." Energies 12, no. 3 (January 26, 2019): 387. http://dx.doi.org/10.3390/en12030387.

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Biomass energy has been used for decades in lieu of fossil fuels. However, biomass, such as wheat straw, typically contains a high concentration of alkali elements, which is likely to induce unfavorable conditions during combustion, such as slagging, agglomeration, and corrosion in the boiler. This study investigated the effects of leaching on the chemical compounds and sintering temperatures of wheat straw ash before and after leaching by tap water. Ash melting and sintering degree tests were conducted using hot-stage microscopy and a scanning electron microscope, respectively. The results show that the ash content in wheat straw decreased by 26.09% (from 4.14% to 3.06%) following leaching, as did the chlorine (Cl), sulfur (S), and nitrogen (N). Meanwhile, the ash-related elements such as potassium (K), magnesium (Mg), and silicon (Si) reduced after leaching too. Additionally, the higher heating value increased slightly, from 19.25 to 19.53 MJ/kg. At the same time, leaching improved the ash melting temperatures of wheat straw during combustion and minimized the ash sintering degree. Similar results were also shown in scanning electron microscope (SEM) images, which clearly indicated that the leached samples had a lighter sintering degree than the original samples. Overall, the leaching process had a positive effect on the ash sintering problems of wheat straw.

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Wang, Dongsheng, Chengxin Zhang, Fanming Zeng, Xiaoli Hu, Chun Li, and Zhongmin Su. "Efficient catalytic reduction of 4-nitrophenol by Cu1.96S/NSC hybrid material derived from metal-organic framework." E3S Web of Conferences 252 (2021): 02065. http://dx.doi.org/10.1051/e3sconf/202125202065.

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Designing carbon-based non-precious metal hybrid materials to replace precious metal catalysts to solve environmental pollution problems is a hot topic of research at this stage. In this work, a dual ligand Cu-MOF was synthesized by the solvothermal method and using Cu-MOF as a sacrificial template further vulcanized to obtain Cu1.96S/NSC hybrid material. The morphology and composition of Cu1.96S/NSC hybrid material were investigated by scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), x-ray diffraction (XRD), nitrogen adsorption-desorption, and x-ray photoelectron spectroscopy (XPS) in detail. Cu1.96S/NSC has excellent catalytic activity in the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) showing the reaction rate constant k=0.0242 s-1, which can reach nearly 100% conversion rate in 3 min. Finally, the mechanism of Cu1.96S/NSC hybrid material’s efficient catalytic reduction of 4-NP was deeply explored.

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Eghbali, Beitallah. "Effect of Warm Deformation on Ferrite Microstructure Evolution in a Ti-Microalloyed Steel." Materials Science Forum 558-559 (October 2007): 497–504. http://dx.doi.org/10.4028/www.scientific.net/msf.558-559.497.

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Warm deformation is one of the promising hot rolling strategies for producing thin hot rolled steel strips. A better understanding of the microstructure evolution during warm deformation is important for a successful introduction of such processing into the industrial production. In the present research, the effect of deformation strain on the ferrite microstructure development in a low carbon Ti-microalloyed steel was investigated through warm torsion testing. Microstructural analysis with optical microscope and electron back-scattering diffraction was carried out on the warm deformed ferrite microstructures. The results show that at the early stage of deformation an unstable subboundaries network forms and low angle boundaries are introduced in the original grains. Then, with further straining, low angle boundaries transform into high angle boundaries and stable fine equiaxed ferrite grains form. It was considered that dynamic softening and dynamically formation of new fine ferrite grains, with high angle boundaries, were caused by continuous dynamic recrystallization of ferrite.

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ElShimy, Haitham, Masahiro Nakajima, Yoshiaki Imaizumi, Fumihito Arai, and Toshio Fukuda. "Fabrication of FIB-CVD Nanotemperature Sensor Probe for Local Temperature Sensing in Water Environments." Journal of Robotics and Mechatronics 19, no. 5 (October 20, 2007): 512–18. http://dx.doi.org/10.20965/jrm.2007.p0512.

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We fabricated a nanotemperature sensor probe using focused ion beam chemical vapor deposition (FIB-CVD) of tungsten over atomic force microscope (AFM) cantilevers, to be used in local sensing temperature distribution in local area. We present the fabrication approach & modifications for making this sensor probe capable of sensing temperature distributions not only in air but in water environment as well. The sensor probe was calibrated in water using the hot stage of an environmental scanning electron microscope (ESEM). Experimental results demonstrated positive characteristics of the temperature coefficient of resistance (TCR). We also illustrate the response of the sensor to sudden changes in surrounding media. The characteristics of this sensor probe were compared to previously reported temperature sensing devices. The comparison verifies that our sensor is relatively uncomplicated and reliable in fabrication. The capability of sensing temperature in water enables our sensor to be used in a wide range of bio-applications, especially in studying single-cell thermogenesis.

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Hu, Xiao Lan, Rong Lu Yu, Gang Liu, and Xiao Su Yi. "Morphology of a Functional POSS/Bismaleimide Nanocomposite and its Monitoring Phase Separation with a Thermoplastic Blend." Advanced Materials Research 266 (June 2011): 166–70. http://dx.doi.org/10.4028/www.scientific.net/amr.266.166.

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A functional polyhedral oligomeric silsesquioxane (POSS) with eight vinyl groups was used to fabricate a POSS/bismaleimide (BMI) nanocomposite as a potential matrix for RTM processing, and its blend with a thermoplastic polyether-ether ketone (PEK-C) was prepared. A self-designed optical microscope with a hot stage has been performed to monitor phase separation process of the thermoplastic-thermoset blend. The phase separation and final morphology of POSS/PEK-C/BMI system were characterized in the research. SEM pictures of POSS/BMI nanocomposite exhibit that the vinyl POSS has significant improvement in toughness of the materials, and its eight vinyl groups lead to chemical bonding interface with BMI resin in the nanocomposite. Results of optical microscope indicate that the corporation of POSS in PEK-C/BMI blend postponed phase separation process. The morphologies show that POSS/PEK-C/BMI systems have a similar phase separation structure with PEK-C/BMI blend.

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36

Howe, James M. "In situ high-resolution Transmission electron microscopy of interphase boundary motion in metallic alloys." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 450–51. http://dx.doi.org/10.1017/s0424820100086556.

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Information provided by in situ studies is often essential for understanding microstructural evolution in solids. The recent development of intermediate-voltage high-resolution transmission electron microscopes (HRTEM) with in situ heating capabilities now provides the opportunity to perform in situ high-resolution studies of interphase boundary (IPB) motion. This paper presents initial results on in situ HRTEM studies of IPB motion in metallic alloys, in particular, during growth of Q precipitates in an Al-Cu-Mg-Ag alloy and Pd3Si crystals in an amorphous Pd-Si alloy.Samples of an Al-4Cu-0.5Mg-0.5Ag (wt.%) alloy were aged for 24 hr at 250°C and electropolished in a HNO3/methanol solution; samples of an amorphous Pd80Si20 (at.%) ribbon were ion milled in a liquid-nitrogen cold-stage at 6 kV, 0.3 mA and 15° tilt. The samples were examined at 400 kV in a JEOL 4000EX microscope equipped with a UHP40X hot-stage pole piece and double-tilt holder at temperatures of 200-400°C. Images were recorded on a Sony BetaCam video cassette recorder connected to a Gatan fiber-optically coupled TV camera with an image intensifier. A 35 mm camera was used to obtain photographs directly from the TV monitor during playback of the video cassettes.

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Thomas, L. E., L. A. Chariot, and J. T. Stanley. "Computer-Aided Analysis of Oriented Crystallites by Diffraction Pattern Simulation and Tilt-Stage Control in a TEM." Microscopy and Microanalysis 3, S2 (August 1997): 1015–16. http://dx.doi.org/10.1017/s143192760001196x.

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Electron diffraction patterns taken in the transmission electron microscope (TEM) provide information about crystal structures and orientations in small sample areas. Extracting this information and manipulating local crystal orientations has become a great deal easier with the availability of desktop computer programs that allow simulation matching of experimental patterns and crystallographic control of sample tilting in the TEM. This presentation will illustrate an application of computer-aided crystallography for analyzing oriented crystallites in an experimentally complex material.The surface corrosion films that form on reactive metals such as hafnium or zirconium in hot water provided our example. Cross-sectional examinations of the corrosion films revealed a columnar microstructure of monoclinic HfO2/ZrO2 grains extending normal to the metal/corrosion-film interface.The columnar grains were only about 50 nm in width, and thus were too small to analyze individually by selected-area diffraction. Local strains in the films smeared the diffraction fine structure so there was little hope for analysis by convergent-beam diffraction methods.

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Iijima, Sumio, Yumi Aikawa, and Kazuhiro Baba. "Growth of diamond particles in chemical vapor deposition." Journal of Materials Research 6, no. 7 (July 1991): 1491–97. http://dx.doi.org/10.1557/jmr.1991.1491.

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An early stage of diamond growth in hot-filament chemical vapor deposition on silicon substrates was examined by the high resolution electron microscope. “Pretreatment” of the substrate surfaces by diamond powder abrading was found to plant diamond seed crystals with a density of as high as 1011/cm2. These crystals provide sites for subsequent growth of diamond films. The CVD grown diamond particles tend to be cuboctahedra. Smaller particles in nanometer size are faultless, but larger ones of several tens of nanometers develop crystal faults. Some of them may originate from the seed crystals. Degradation of the diamond seed crystals due to the electron beam irradiation is discussed in terms of fabrication of diamond film.

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Gross, Todd S., Nazri bin Kamsah, and Igor I. Tsukrov. "Scanning probe microscopy generated out-of-plane deformation maps exhibiting heterogeneous nanoscale deformation resulting from thermal cycling of Cu–polyimide damascene interconnects." Journal of Materials Research 16, no. 12 (December 2001): 3560–66. http://dx.doi.org/10.1557/jmr.2001.0488.

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Room-temperature scanning probe microscopy was used to generate out-of-plane deformation maps around Cu vias and polyimide mesas in single-level Cu–polyimide damascene interconnect structures subjected to a room-temperature to 350 °C thermal cycle. The deformation maps are obtained by taking the difference between the images obtained before and after thermal processing. The deformation of the Cu is shown to be highly heterogeneous on the submicrometer scale. Direct evidence of Cu–Ta interfacial sliding, Cu–Cu grain boundary sliding, and diffusion creep is presented. The direction of Cu–Ta sliding is shown to depend on polyimide mesa size. A hot-stage atomic force microscope was used to show that hillock/extrusion growth occurs at temperatures between 130 and 180 °C. We propose that this hillock/extrusion growth is correlated with dips in stress–temperature plots for blanket, uncapped Cu films in the same temperature range and that the absence of dips for nitride-capped Cu films is due to suppression of the hillock/extrusion growth.

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40

Srilekha, Gandu, Pokkunuri Pardhasaradhi, Boddapati Taraka Phani Madhav, and Manepalli Ramakrishna Nanchara Rao. "Effect of ZnO nanoparticles on optical textures and image analysis properties of 7O.O5 liquid crystalline compound." Zeitschrift für Naturforschung A 76, no. 4 (February 18, 2021): 349–59. http://dx.doi.org/10.1515/zna-2020-0302.

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Abstract The systematic studies are carried out on liquid crystalline N-(p-n-heptyloxybenzylidene)-p-n-pentyloxy aniline (7O.O5) pure compound and with dispersion of ZnO nanoparticles in 1 wt% respectively. The phase transition studies of the pure and LC nanocomposite are carried out using Polarizing Optical Microscope (POM) attached with hot stage along with digital camera and Differential Scanning Calorimetry (DSC) is used to measure enthalpy and transition temperature values. Further the presence of ZnO nano particles in 7O.O5 is determined by Scanning Electron Microscopy (SEM) analysis. It is identified that due to dispersion of nano particles SmG phase is Quenched and nematic thermal range is increased. To enhance the captured textural images, an algorithm that uses tuned intensification operators have been proposed in this article. Statistical parameters for enhanced output images are calculated and compared with existing algorithms such as Adaptive Gamma Correction (AGC) and Discrete Wavelet Transform – Singular Value Decomposition (DWT-SVD) to understand the effectiveness of proposed algorithm. Further, optical parameters have been computed to understand the thermo optical nature of liquid crystalline compounds.

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Tung, Chia Hsin, and Tien Wei Shyr. "Crystallization Regimes and Spherulitic Morphology of Poly(trimethylene terephthalate/isophthalate) Random Copolyesters." Advanced Materials Research 834-836 (October 2013): 129–32. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.129.

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The crystallization regimes and spherulitic morphology of poly (trimethylene terephthalate/isophthalate) (TI) random copolyesters were studied in this work. A hot stage polarizing microscope was used to observe morphology and measure growth rate of the spherulite of TI copolyesters. Lauritzen-Hoffman secondary nucleation theory was applied to investigate crystallization kinetics and regimes of TI copolyesters. Results show that the spherulitic growth rate decreased with an increase in isophthalic acid content of the copolyesters. The analysis of Lauritzen-Hoffman secondary nucleation theory shows that regime I, II, and III were observed in TI11 and TI21. Regime III was observed in TI29. The spherulitic morphology of TI11, TI21, and TI29 changed from elliptical-shaped spherulite to irregular spherulite and then to normal spherulite at the regime transitions.

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Pisipati, Venkata, M. Saraswathi, D. Madhavi Latha, P. Pardhasaradhi, and P. V. Datta Prasad. "Synthesis, Characterization and Phase Transition Studies on Some N-(4-Butyloxy Benzylidene)-4-Alkoxy Anilines, 4O.Om Compounds - A Dilatometric Study." JOURNAL OF ADVANCES IN PHYSICS 2, no. 1 (October 5, 2013): 38–47. http://dx.doi.org/10.24297/jap.v2i1.2101.

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Dilatometric studies are carried out on the synthesized N-(4-butyloxy benzylidene)-4-alkoxy anilines, 4O.Om compounds with the m = 3 to 7 and 9. Characterization of these compounds is done using the polarizing microscope attached with a hot stage. The differential scanning calorimeter is employed to find out the transition temperatures as well as the heats of transitions. All the compounds exhibit nematic phase with varying thermal ranges with the clearing temperatures are above 100 OC as unlike the case of the well known N-(4-butyloxy benzylidene)-4-alkyl anilines, 4O.m compounds which exhibit rich poymorphysim and the clearing temperatures are well below 100 OC. As expected the isotropic to nematic transition exhibited first order nature and the results are discussed with the body of the data available in literature.

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Senthilkumar, Natarajan, Tanneru Narasimhaswamy, and Aravamudhan Raghavan. "Novel Hydroxy- and Methyl-Terminated Triaromatic Schiff Base Compounds: Synthesis and Mesogenic Properties." Australian Journal of Chemistry 63, no. 2 (2010): 276. http://dx.doi.org/10.1071/ch09405.

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A series of Schiff base hydroxy-mesogens and their model compounds have been synthesized. The mesogen is constructed from three-ring-containing mesogens linked through ester and azomethine groups with a terminal hydroxy group. The related model compounds were also synthesized with varying chain length with a terminal methyl group and their properties were compared with that of hydroxy mesogens. Extensive characterization of all mesogenic compounds was carried out by Fourier-transform IR, 1H and 13C NMR and mass spectroscopy. The phase characteristics such as nature of phase, melting and clearing temperatures and phase range were evaluated using a hot-stage optical polarizing microscope and differential scanning calorimetry. The appearance of enantiotropic smectic phases is due to the high molecular polarizability of the triaromatic core with azomethine and ester linkages.

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Sastry, S. Sreehari, T. Vindhya Kumari, C. Nageswara Rao, K. Mallika, S. Lakshminarayana, and Ha Sie Tiong. "Transition Temperatures of Thermotropic Liquid Crystals from the Local Binary Gray Level Cooccurrence Matrix." Advances in Condensed Matter Physics 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/527065.

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This paper presents a method which combines the statistical analysis with texture structural analysis called Local Binary Gray Level Cooccurrence Matrix (LBGLCM) to investigate the phase transition temperatures of thermotropicp,n-alkyloxy benzoic acid (nOBA,n=4,6,8,10and 12) liquid crystals. Textures of the homeotropically aligned liquid crystal compounds are recorded as a function of temperature using polarizing optical microscope attached to the hot stage and high resolution camera. In this method, second-order statistical parameters (contrast, energy, homogeneity, and correlation) are extracted from the LBGLCM of the textures. The changes associatedwiththe values of extracted parameters as a function of temperature are a helpful process to identify the phases and phase transition temperatures of the samples. Results obtained from this method have validity and are in good agreement with the literature.

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Fielden, I. M., and J. M. Rodenburg. "A Technique for Real-Time, In-Situ SEM Observation of Grain Growth at Elevated Temperatures." Materials Science Forum 467-470 (October 2004): 1385–88. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.1385.

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We present a novel electron detector and technique permitting orientation contrast images to be generated using back-scattered electron signals. The detector is a modification of the converter plate. It is unaffected by Infra-Red and light photons and invulnerable to the effects of heat. Consequently, the detector is removed as the temperature limiting factor in elevated temperature SEM grain observations. The detector has been successfully applied to an environmental SEM (ESEM) operating in high vacuum mode and has produced good quality video image sequences of hot metal specimens with frame rates between 1 per second and 1 per 30 seconds (largely material dependent). Temperatures attained were up to 850°C, limited by the capability of the hot stage. Although developed for the ESEM the technique is applicable to any SEM provided that adequate measures are taken to manage contamination and heat effects on other microscope components. We have produced images and short, accelerated video sequences of recrystallisation and grain growth phenomena in steel, aluminium, copper and gold by the new technique. The technique has also successfully imaged phase transformations and high temperature behaviour of microelectronic materials.

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Yang, Peng, Chunlei Qin, Shichao Du, Lina Jia, Yujia Qin, Junbo Gong, and Songgu Wu. "Crystal Structure, Stability and Desolvation of the Solvates of Sorafenib Tosylate." Crystals 9, no. 7 (July 17, 2019): 367. http://dx.doi.org/10.3390/cryst9070367.

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In this study, three solvates of sorafenib tosylate were obtained from methanol, ethanol and n-methyl-2-pyrrolidone (NMP) after solvate screening and the effect of solvent on the formation of solvate was analyzed. The solvents with high value of polarity/dipolarity and appropriate hydrogen bond donor/acceptor propensity are more likely to form corresponding solvates. The crystal structures of the solvates were elucidated for the first time by using single crystal X-ray diffraction data. The analysis results indicate that methanol solvate and ethanol solvate are isostructural and hydrogen bonds could be formed between solvent molecules and sorafenib tosylate molecules. Hirshfeld surface analysis was used to research the interactions in the solvates, and the results reveal that the H···H, C···H/H···C and O···H/ H···O contacts play the vital role in molecular packing. In addition, three solvates were characterized by polarized light microscope, powder X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry. The solvates show different thermodynamic stability in methanol +NMP and ethanol +NMP mixtures. Furthermore, the desolvation of solvates was studied by hot stage microscope and discussed.

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Sharma, Deepika, Sachin Tyagi, and K. K. Raina. "Morphological and Dielectric Behavior of Carbon Nanotube-Ferroelectric Liquid Crystal Composite." Advanced Materials Research 67 (April 2009): 167–72. http://dx.doi.org/10.4028/www.scientific.net/amr.67.167.

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The present study deals with the effect of dispersing Carbon Nano Tubes in Ferro-electric liquid crystal material. Carbon nanotube dispersed ferroelectric liquid crystals have high dielectric constant, fast switching response, large electro-optic coefficient which makes them ideal for memories, capacitors and display devices etc. An attempt has been made to understand the influence of carbon nanotubes on dielectric and morphological properties of ferro-electric liquid crystal. The effect of carbon nanotubes concentration on the transition temperature of ferro-electric liquid crystal is also studied. Hot Stage Microscope is used to investigate the texture and phase transformations in the composite. Differential Scanning Calorimetry also indicated the phase transformations. The results are compared with the original ferro-electric liquid crystal material which showed that the dielectric permittivity is increased to a great extent with the addition of carbon nanotubes.

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Sastry, S. Sreehari, B. Gowri Sankara Rao, K. B. Mahalakshmi, K. Mallika, C. Nageswara Rao, and Ha Sie Tiong. "Image Analysis Studies for Phase Transitions of Ferroelectric Liquid Crystals." ISRN Condensed Matter Physics 2012 (October 21, 2012): 1–8. http://dx.doi.org/10.5402/2012/423650.

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Phase transition temperatures of ferroelectric liquid crystals ((S)-(-)-2-methylbutyl 4′-(4″-n-alkanoyloxybenzoyloxy) biphenyl-4-carboxylates (where n=16 and 18)) are studied through two techniques of image analysis. One is a statistical method, applied to compute the statistical parameters from the textures of each sample and the other, computation of Legendre moments being applied as image moment analysis, both of which are considered as a function of temperature. The textures of the samples are recorded with the polarizing optical microscope (POM) attached to the hot stage and high resolution camera. The phase transition temperatures of samples are inferred by the abrupt changes in the computed parameter values. The results obtained from the present methodology are in good agreement with those published in earlier literature done by the different techniques, like differential scanning calorimetry (DSC).

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Wang, Liang, Jian Guo Zhang, Bin Shen, and Fang Hong Sun. "Cutting Performances of Diamond Coated Milling Tools in Machining Aluminum Alloy." Advanced Materials Research 188 (March 2011): 122–27. http://dx.doi.org/10.4028/www.scientific.net/amr.188.122.

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CVD diamond films are deposited on cobalt cemented tungsten carbide (WC-Co) endmills using hot filament chemical vapor deposition (HFCVD) method. Scanning electron microscope (SEM) and Raman spectroscopy are used to characterize the as-deposited diamond films. To evaluate the cutting performances of as-fabricated CVD diamond coated endmills, dry milling tests are conducted using aluminum alloy as the workpiece material. The uncoated WC-Co endmills are also adopted in the milling tests for the sake of comparability. The experimental results show that the build-up edge formed on the uncoated WC-Co endmills at very early stage of the cutting tests. Comparatively, CVD diamond coated endmills present an excellent anti-adhering property. The result suggests that depositing diamond coating on WC-Co endmills is a viable way to improve their cutting performances in machining of aluminum alloy materials

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Darusman, Fitrianti, Sundani N. Soewandhi, and Rachmat Mauludin. "Peningkatan Kelarutan dan Laju Disolusi Glimepirid Melalui Metode Kokristalisasi." Indonesian Journal of Pharmaceutical Science and Technology 4, no. 1 (April 13, 2017): 35. http://dx.doi.org/10.15416/ijpst.v4i1.9008.

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Telah dilakukan kokristalisasi glimepirid (GMP) dengan asam oksalat (AO) menggunakan metode penggilingan dan pelarutan (menggunakan pelarut aseton). Diagram fase sistem biner GMP-AO digunakan untuk identifikasi awal pembentukan interaksi antar kedua komponen serta ditegaskan kembali dengan analisis mikroskopik menggunakan alat pemanas (hot stage) yang dihubungkan dengan mikroskop polarisasi. Padatan hasil kokristalisasi dikarakterisasi dengan metode analisis termal (Differential Scanning Calorymetry), difraktometri sinar-X serbuk (Powder X-Ray Diffraction), spektrofotometri inframerah (Fourier Transform-Infra Red) dan mikroskopi (Scanning Electron Microscope). Hasil identifikasi dan karakterisasi menunjukkan interaksi eutektik antara kedua fase kristalin GMP-AO dalam keadaan padat pada perbandingan molar 3:7, dengan titik eutektik pada temperatur 128,7°C. Selanjutnya, uji kelarutan dan laju disolusinya menggunakan media dapar fosfat pH 7,4. Kelarutan dan laju disolusi GMP hasil kokristalisasi meningkat dibandingkan dengan campuran fisika dan senyawa tunggalnya.Kata kunci : glimepirid, kokristalisasi, eutektik, kelarutan dan laju disolusi.

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Journal articles on the topic 'Hot stage microscope'

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