The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Laetitia Gazagnes - One of the best experts on this subject based on the ideXlab platform.
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Thermal effects on viscoelastic properties of silicate glass melts
The Journal of Chemical Physics, 2003Co-Authors: Ph. Tordjeman, J. M. Felio, Laetitia GazagnesAbstract:High-temperature viscoelastic properties of two different silicate glass melts have been measured with a new high-temperature rheometer between 700 °C and 900 °C. Our experiments demonstrate that the viscoelastic properties in the Terminal Zone, a low-frequency domain which has never been explored, are very sensitive to the chemical composition of the glass and to the thermal treatment applied during the preparation of the samples. The storage shear modulus G′ and the loss shear modulus G″ were measured at constant temperature between 10−3 and 102 rad/s. The two chosen silicate glass melts have different chemical compositions and, moreover, each of them was prepared with two thermal treatments during the sample molding. In the experimental range of temperature, the viscoelastic properties of the two glass melts are characteristic of the ultimate rheological behavior at low frequencies called the Terminal Zone. We tested the possibility of building the rheological master curve for the two liquids over a wi...
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Thermal effects on viscoelastic properties of silicate glass melts
Journal of Chemical Physics, 2003Co-Authors: Ph. Tordjeman, J. M. Felio, Laetitia GazagnesAbstract:High-temperature viscoelastic properties of two different silicate glass melts have been measured with a new high-temperature rheometer between 700 °C and 900 °C. Our experiments demonstrate that the viscoelastic properties in the Terminal Zone, a low-frequency domain which has never been explored, are very sensitive to the chemical composition of the glass and to the thermal treatment applied during the preparation of the samples. The storage shear modulus G' and the loss shear modulus G" were measured at constant temperature between 10-3 and 102 rad/s. The two chosen silicate glass melts have different chemical compositions and, moreover, each of them was prepared with two thermal treatments during the sample molding. In the experimental range of temperature, the viscoelastic properties of the two glass melts are characteristic of the ultimate rheological behavior at low frequencies called the Terminal Zone. We tested the possibility of building the rheological master curve for the two liquids over a wide frequency domain. Experiments show that one quenched glass melt has a Maxwell viscoelastic behavior and obeys time-temperature superposition, while the same glass annealed below the glass transition temperature presents changes in the viscoelastic behavior and does not obey time-temperature superposition. The second glass is non-Maxwellian and does not obey time-temperature superposition for the two thermal conditions of molding showing a phase transition, or a structural change transition, between 700 °C and 900 °C. We observed a great influence of the thermal treatment on the viscoelastic properties in the melted state for the two silicates.
Ph. Tordjeman - One of the best experts on this subject based on the ideXlab platform.
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Terminal Zone behavior of silicate glass melts
Journal of Non-Newtonian Fluid Mechanics, 2004Co-Authors: Ph. Tordjeman, Jean-yves FerrandisAbstract:Abstract High temperature viscoelastic properties of two different silicate glass melts have been measured with a new high temperature rheometer between 700 and 900 °C. Our experiments demonstrate that the viscoelastic properties in the Terminal Zone, a low frequency domain which has never been explored, are very sensitive to the chemical composition of the glass and to the thermal treatment applied during the preparation of the samples. The storage shear modulus G′ and the loss shear modulus G″ were measured at constant temperature between 10−3 and 102 rad/s. The two chosen silicate glass melts have different chemical compositions and moreover one of them was prepared with two thermal treatments during the sample molding. In the experimental range of temperature, the viscoelastic properties of the two glass melts are characteristic of the ultimate rheological behavior at low frequencies called the Terminal Zone. We tested the possibility of building the rheological master curve of the two liquids over a wide frequency domain. Experiments show that one glass melt has a Maxwell viscoelastic behavior and obeys time–temperature superposition. Its master curve shows that the glass melt follows the Williams–Landel–Ferry equation. On the other hand, the second glass is non-Maxwellian and does not obey time–temperature superposition. In that case, the master curve cannot be built showing a phase transition, or structural change transition, between 700 and 900 °C.
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Terminal Zone behavior of silicate glass melts
Journal of Non-Newtonian Fluid Mechanics, 2004Co-Authors: Ph. Tordjeman, Jean-yves FerrandisAbstract:High temperature viscoelastic properties of two different silicate glass melts have been measured with a new high temperature rheometer between 700 and 900 °C. Our experiments demonstrate that the viscoelastic properties in the Terminal Zone, a low frequency domain which has never been explored, are very sensitive to the chemical composition of the glass and to the thermal treatment applied during the preparation of the samples. The storage shear modulus G' and the loss shear modulus G were measured at constant temperature between 10-3 and 102 rad/s. The two chosen silicate glass melts have different chemical compositions and moreover one of them was prepared with two thermal treatments during the sample molding. In the experimental range of temperature, the viscoelastic properties of the two glass melts are characteristic of the ultimate rheological behavior at low frequencies called the Terminal Zone. We tested the possibility of building the rheological master curve of the two liquids over a wide frequency domain
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Thermal effects on viscoelastic properties of silicate glass melts
The Journal of Chemical Physics, 2003Co-Authors: Ph. Tordjeman, J. M. Felio, Laetitia GazagnesAbstract:High-temperature viscoelastic properties of two different silicate glass melts have been measured with a new high-temperature rheometer between 700 °C and 900 °C. Our experiments demonstrate that the viscoelastic properties in the Terminal Zone, a low-frequency domain which has never been explored, are very sensitive to the chemical composition of the glass and to the thermal treatment applied during the preparation of the samples. The storage shear modulus G′ and the loss shear modulus G″ were measured at constant temperature between 10−3 and 102 rad/s. The two chosen silicate glass melts have different chemical compositions and, moreover, each of them was prepared with two thermal treatments during the sample molding. In the experimental range of temperature, the viscoelastic properties of the two glass melts are characteristic of the ultimate rheological behavior at low frequencies called the Terminal Zone. We tested the possibility of building the rheological master curve for the two liquids over a wi...
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Thermal effects on viscoelastic properties of silicate glass melts
Journal of Chemical Physics, 2003Co-Authors: Ph. Tordjeman, J. M. Felio, Laetitia GazagnesAbstract:High-temperature viscoelastic properties of two different silicate glass melts have been measured with a new high-temperature rheometer between 700 °C and 900 °C. Our experiments demonstrate that the viscoelastic properties in the Terminal Zone, a low-frequency domain which has never been explored, are very sensitive to the chemical composition of the glass and to the thermal treatment applied during the preparation of the samples. The storage shear modulus G' and the loss shear modulus G" were measured at constant temperature between 10-3 and 102 rad/s. The two chosen silicate glass melts have different chemical compositions and, moreover, each of them was prepared with two thermal treatments during the sample molding. In the experimental range of temperature, the viscoelastic properties of the two glass melts are characteristic of the ultimate rheological behavior at low frequencies called the Terminal Zone. We tested the possibility of building the rheological master curve for the two liquids over a wide frequency domain. Experiments show that one quenched glass melt has a Maxwell viscoelastic behavior and obeys time-temperature superposition, while the same glass annealed below the glass transition temperature presents changes in the viscoelastic behavior and does not obey time-temperature superposition. The second glass is non-Maxwellian and does not obey time-temperature superposition for the two thermal conditions of molding showing a phase transition, or a structural change transition, between 700 °C and 900 °C. We observed a great influence of the thermal treatment on the viscoelastic properties in the melted state for the two silicates.
William C. Hamlett - One of the best experts on this subject based on the ideXlab platform.
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microscopic organization of the sperm storage tubules in the oviducal gland of the female gummy shark mustelus antarcticus with observations on sperm distribution and storage
Journal of Morphology, 2008Co-Authors: William C. Hamlett, Megan T Storrie, Terence I Walker, L LaurensonAbstract:Oviducal gland morphology, the microscopic organization of the Terminal Zone, and sperm storage were described in the female gummy shark (Mustelus antarcticus). Mustelus antarcticus is a nonplacental viviparous hound shark, which displays minimal histotrophy during embryonic development. The animals examined represented all stages of maturity and gestation. The oviducal gland was found to have the same fundamental zonation as in most chondrichthyans. Using recent terminology, the oviducal gland of chondrichthyans has an anterior club Zone, followed by a papillary Zone, both of which produce jelly that surrounds the egg, a baffle Zone that elaborates the tertiary egg envelope and a Terminal Zone, where sperm storage occurs. Each Zone is composed of simple tubular glands that connect to transverse grooves, which extend the full width of the gland. The exception is the Terminal Zone, which does not have transverse grooves but consists of individual tubules. The microscopic organization and histochemical nature of the Zones display similar patterns to those of other chondrichthyan genera. Tubules of the Terminal Zone contain four types of cell: ciliated cells, alcian blue-positive secretory cells, periodic acid-Schiff and alcian blue-negative secretory cells, and secretory columnar cells. These tubules end in recesses, the sperm storage tubules, which extend beyond the periphery of the baffle Zone. Sperm were stored in the sperm storage tubules of all maturing and mature animals examined. Of note is the observation of stored sperm in an animal 1 year prior to first ovulation. Sperm were also observed throughout the uterine sphincter, body of the uterus, isthmus, and oviduct of maturing and mature animals, and in the uterine sphincter of an immature animal. These sperm represent immediately postcopulation aggregations of sperm and sperm in the process of migrating to the site of storage or to the site of fertilization. J. Morphol., 2008. © 2008 Wiley-Liss, Inc.
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Microscopic organisation of the oviducal gland of the holocephalan elephant fish, Callorhynchus milii
Marine and Freshwater Research, 2004Co-Authors: Rachel M. Smith, Terence I Walker, William C. HamlettAbstract:The study of chondrichthyan reproductive biology has a long history, but the structure and function of the holocephalan oviducal glands (OG) is poorly known; these organs are a vital component in the understanding of chondrichthyan life history. Histochemical techniques revealed that a fundamental zonation was evident in the OG of Callorhynchus milii, similar to most elasmobranchs. In sexually mature females, the following Zones occurred (anterior to posterior): (1) club Zone, periodic acid–Schiff positive (PAS+), indicating glycoprotein or any mucus substance containing neutral sugars, and Alcian blue positive, pH 2.5 (AB+), indicating the presence of sulfated and unsulfated acid glycosaminoglycans and sialoglycoproteins; (2) papillary Zone (AB+); (3) baffle Zone (PAS–, AB–); and (4) Terminal Zone (AB++). Using histological and histochemical techniques not used previously with the holocephalan group, we demonstrated that the structure and function of the OG Zones were equivalent between oviparous elasmobranchs and C. milii, even though their final egg capsule morphologies differed. It was also evident that the club and papillary Zones produce the egg jelly that surrounds the egg and the baffle Zone formed the multilaminate egg capsule. Furthermore, the Terminal Zone had functions associated with sperm storage and the production of fine hairs that decorate the surface of the egg capsule.
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uterine epithelial sperm interaction endometrial cycle and sperm storage in the Terminal Zone of the oviducal gland in the placental smoothhound mustelus canis
Journal of Experimental Zoology, 2002Co-Authors: William C. Hamlett, Christopher K Hysell, John A. Musick, David M. SeverAbstract:The fate of spermatozoa deposited within the female reproductive tract has been described in the smoothhound, Mustelus canis. Evidence of uterine epithelial-sperm interaction is presented, as well as documentation of sperm storage specifically in the Terminal Zone of the oviducal gland. Sperm fate is correlated with morphology of the endometrial cycle and specificity of storage in the oviducal gland. The endometrium of M. canis undergoes dramatic tissue remodeling associated with gestation. In females harboring fertilized ova or preimplantation yolk-reliant embryos, the uterine epithelium is simple cuboidal with mucous droplets for lubrication. The presence of the embryo elicits a response from the uterus, which becomes modified for nutrient and respiratory exchange into vascular uterine attachment sites that abut the distal aspect of the yolk sac. Areas of the uterus adjacent to the uterine attachment sites are termed paraplacental sites. Uterine attachment sites are simple squamous while the paraplacental epithelium is simple columnar. Paraplacental cells have basal metachromatic vesicles and a dense array of apical cytoplasmic filaments. Immediately postpartum the uterine attachment sites, now termed uterine or placental scars, begin to remodel to a mucous epithelium for the next gestational cycle. Paraplacental cells slough off the apical filamentous portion, and sperm become embedded in the epithelium. Bundled sperm occur throughout gestation in the Terminal Zone of the oviducal gland. Sperm are not embedded in the Terminal Zone epithelium as in the uterus. Following sperm release from the uterus, the paraplacental epithelium reverts to a mucous epithelium for the next reproductive cycle. Fertilization is presumed to occur in the anterior oviduct above the oviducal gland. The physiological mechanisms that mediate sperm-uterus attachment, release, and storage in the Terminal Zone of the oviducal gland are currently under investigation.
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uterine epithelial sperm interaction endometrial cycle and sperm storage in the Terminal Zone of the oviducal gland in the placental smoothhound mustelus canis
Journal of Experimental Zoology, 2002Co-Authors: William C. Hamlett, Christopher K Hysell, John A. Musick, David M. SeverAbstract:The fate of spermatozoa deposited within the female reproductive tract has been described in the smoothhound, Mustelus canis. Evidence of uterine epithelial-sperm interaction is presented, as well as documentation of sperm storage specifically in the Terminal Zone of the oviducal gland. Sperm fate is correlated with morphology of the endometrial cycle and specificity of storage in the oviducal gland. The endometrium of M. canis undergoes dramatic tissue remodeling associated with gestation. In females harboring fertilized ova or preimplantation yolk-reliant embryos, the uterine epithelium is simple cuboidal with mucous droplets for lubrication. The presence of the embryo elicits a response from the uterus, which becomes modified for nutrient and respiratory exchange into vascular uterine attachment sites that abut the distal aspect of the yolk sac. Areas of the uterus adjacent to the uterine attachment sites are termed paraplacental sites. Uterine attachment sites are simple squamous while the paraplacental epithelium is simple columnar. Paraplacental cells have basal metachromatic vesicles and a dense array of apical cytoplasmic filaments. Immediately postpartum the uterine attachment sites, now termed uterine or placental scars, begin to remodel to a mucous epithelium for the next gestational cycle. Paraplacental cells slough off the apical filamentous portion, and sperm become embedded in the epithelium. Bundled sperm occur throughout gestation in the Terminal Zone of the oviducal gland. Sperm are not embedded in the Terminal Zone epithelium as in the uterus. Following sperm release from the uterus, the paraplacental epithelium reverts to a mucous epithelium for the next reproductive cycle. Fertilization is presumed to occur in the anterior oviduct above the oviducal gland. The physiological mechanisms that mediate sperm-uterus attachment, release, and storage in the Terminal Zone of the oviducal gland are currently under investigation.
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Ultrastructural analysis of sperm storage and morphology of the oviducal gland in the Oman shark, Iago omanensis (Triakidae)
Marine and Freshwater Research, 2002Co-Authors: William C. Hamlett, Christopher K Hysell, Lev Fishelson, Avi Baranes, David M. SeverAbstract:Sperm storage, oviducal gland morphology and ultrastructure are described in pregnant females of the viviparous placental Oman shark, Iago omanensis, that were harbouring uterine eggs, embryos or fetuses. Zonation of the gland from anterior to posterior is similar to those previously described for other elasmobranchs and is designated as club, papillary, baffle and Terminal Zones. The Terminal Zone has two regions, the first comprising short tubules adjacent to the baffle Zone that are positive by periodic acid–Schiff. Posteriorly, the Terminal Zone has deep clefts that terminate as dilated recesses harbouring laterally arrayed bundles of spermatozoa surrounded by a flocculent matrix. Sperm were found in the Terminal Zone of all animals examined. Samples were not available throughout gestation, so it is not known whether the sperm is stored from a single insemination or from multiple matings. The club Zone stains positive by the periodic acid–Schiff method, as does the papillary Zone. The last lamella of the papillary Zone is positive by Alcian blue staining. The secretory product of the baffle Zone is the tertiary egg envelope that encloses the developing embryo during much of gestation.
David M. Sever - One of the best experts on this subject based on the ideXlab platform.
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uterine epithelial sperm interaction endometrial cycle and sperm storage in the Terminal Zone of the oviducal gland in the placental smoothhound mustelus canis
Journal of Experimental Zoology, 2002Co-Authors: William C. Hamlett, Christopher K Hysell, John A. Musick, David M. SeverAbstract:The fate of spermatozoa deposited within the female reproductive tract has been described in the smoothhound, Mustelus canis. Evidence of uterine epithelial-sperm interaction is presented, as well as documentation of sperm storage specifically in the Terminal Zone of the oviducal gland. Sperm fate is correlated with morphology of the endometrial cycle and specificity of storage in the oviducal gland. The endometrium of M. canis undergoes dramatic tissue remodeling associated with gestation. In females harboring fertilized ova or preimplantation yolk-reliant embryos, the uterine epithelium is simple cuboidal with mucous droplets for lubrication. The presence of the embryo elicits a response from the uterus, which becomes modified for nutrient and respiratory exchange into vascular uterine attachment sites that abut the distal aspect of the yolk sac. Areas of the uterus adjacent to the uterine attachment sites are termed paraplacental sites. Uterine attachment sites are simple squamous while the paraplacental epithelium is simple columnar. Paraplacental cells have basal metachromatic vesicles and a dense array of apical cytoplasmic filaments. Immediately postpartum the uterine attachment sites, now termed uterine or placental scars, begin to remodel to a mucous epithelium for the next gestational cycle. Paraplacental cells slough off the apical filamentous portion, and sperm become embedded in the epithelium. Bundled sperm occur throughout gestation in the Terminal Zone of the oviducal gland. Sperm are not embedded in the Terminal Zone epithelium as in the uterus. Following sperm release from the uterus, the paraplacental epithelium reverts to a mucous epithelium for the next reproductive cycle. Fertilization is presumed to occur in the anterior oviduct above the oviducal gland. The physiological mechanisms that mediate sperm-uterus attachment, release, and storage in the Terminal Zone of the oviducal gland are currently under investigation.
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uterine epithelial sperm interaction endometrial cycle and sperm storage in the Terminal Zone of the oviducal gland in the placental smoothhound mustelus canis
Journal of Experimental Zoology, 2002Co-Authors: William C. Hamlett, Christopher K Hysell, John A. Musick, David M. SeverAbstract:The fate of spermatozoa deposited within the female reproductive tract has been described in the smoothhound, Mustelus canis. Evidence of uterine epithelial-sperm interaction is presented, as well as documentation of sperm storage specifically in the Terminal Zone of the oviducal gland. Sperm fate is correlated with morphology of the endometrial cycle and specificity of storage in the oviducal gland. The endometrium of M. canis undergoes dramatic tissue remodeling associated with gestation. In females harboring fertilized ova or preimplantation yolk-reliant embryos, the uterine epithelium is simple cuboidal with mucous droplets for lubrication. The presence of the embryo elicits a response from the uterus, which becomes modified for nutrient and respiratory exchange into vascular uterine attachment sites that abut the distal aspect of the yolk sac. Areas of the uterus adjacent to the uterine attachment sites are termed paraplacental sites. Uterine attachment sites are simple squamous while the paraplacental epithelium is simple columnar. Paraplacental cells have basal metachromatic vesicles and a dense array of apical cytoplasmic filaments. Immediately postpartum the uterine attachment sites, now termed uterine or placental scars, begin to remodel to a mucous epithelium for the next gestational cycle. Paraplacental cells slough off the apical filamentous portion, and sperm become embedded in the epithelium. Bundled sperm occur throughout gestation in the Terminal Zone of the oviducal gland. Sperm are not embedded in the Terminal Zone epithelium as in the uterus. Following sperm release from the uterus, the paraplacental epithelium reverts to a mucous epithelium for the next reproductive cycle. Fertilization is presumed to occur in the anterior oviduct above the oviducal gland. The physiological mechanisms that mediate sperm-uterus attachment, release, and storage in the Terminal Zone of the oviducal gland are currently under investigation.
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Ultrastructural analysis of sperm storage and morphology of the oviducal gland in the Oman shark, Iago omanensis (Triakidae)
Marine and Freshwater Research, 2002Co-Authors: William C. Hamlett, Christopher K Hysell, Lev Fishelson, Avi Baranes, David M. SeverAbstract:Sperm storage, oviducal gland morphology and ultrastructure are described in pregnant females of the viviparous placental Oman shark, Iago omanensis, that were harbouring uterine eggs, embryos or fetuses. Zonation of the gland from anterior to posterior is similar to those previously described for other elasmobranchs and is designated as club, papillary, baffle and Terminal Zones. The Terminal Zone has two regions, the first comprising short tubules adjacent to the baffle Zone that are positive by periodic acid–Schiff. Posteriorly, the Terminal Zone has deep clefts that terminate as dilated recesses harbouring laterally arrayed bundles of spermatozoa surrounded by a flocculent matrix. Sperm were found in the Terminal Zone of all animals examined. Samples were not available throughout gestation, so it is not known whether the sperm is stored from a single insemination or from multiple matings. The club Zone stains positive by the periodic acid–Schiff method, as does the papillary Zone. The last lamella of the papillary Zone is positive by Alcian blue staining. The secretory product of the baffle Zone is the tertiary egg envelope that encloses the developing embryo during much of gestation.
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Uterine epithelial‐sperm interaction, endometrial cycle and sperm storage in the Terminal Zone of the oviducal gland in the placental smoothhound, Mustelus canis
Journal of Experimental Zoology, 2001Co-Authors: William C. Hamlett, Christopher K Hysell, John A. Musick, David M. SeverAbstract:The fate of spermatozoa deposited within the female reproductive tract has been described in the smoothhound, Mustelus canis. Evidence of uterine epithelial-sperm interaction is presented, as well as documentation of sperm storage specifically in the Terminal Zone of the oviducal gland. Sperm fate is correlated with morphology of the endometrial cycle and specificity of storage in the oviducal gland. The endometrium of M. canis undergoes dramatic tissue remodeling associated with gestation. In females harboring fertilized ova or preimplantation yolk-reliant embryos, the uterine epithelium is simple cuboidal with mucous droplets for lubrication. The presence of the embryo elicits a response from the uterus, which becomes modified for nutrient and respiratory exchange into vascular uterine attachment sites that abut the distal aspect of the yolk sac. Areas of the uterus adjacent to the uterine attachment sites are termed paraplacental sites. Uterine attachment sites are simple squamous while the paraplacental epithelium is simple columnar. Paraplacental cells have basal metachromatic vesicles and a dense array of apical cytoplasmic filaments. Immediately postpartum the uterine attachment sites, now termed uterine or placental scars, begin to remodel to a mucous epithelium for the next gestational cycle. Paraplacental cells slough off the apical filamentous portion, and sperm become embedded in the epithelium. Bundled sperm occur throughout gestation in the Terminal Zone of the oviducal gland. Sperm are not embedded in the Terminal Zone epithelium as in the uterus. Following sperm release from the uterus, the paraplacental epithelium reverts to a mucous epithelium for the next reproductive cycle. Fertilization is presumed to occur in the anterior oviduct above the oviducal gland. The physiological mechanisms that mediate sperm-uterus attachment, release, and storage in the Terminal Zone of the oviducal gland are currently under investigation.
J. M. Felio - One of the best experts on this subject based on the ideXlab platform.
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Thermal effects on viscoelastic properties of silicate glass melts
The Journal of Chemical Physics, 2003Co-Authors: Ph. Tordjeman, J. M. Felio, Laetitia GazagnesAbstract:High-temperature viscoelastic properties of two different silicate glass melts have been measured with a new high-temperature rheometer between 700 °C and 900 °C. Our experiments demonstrate that the viscoelastic properties in the Terminal Zone, a low-frequency domain which has never been explored, are very sensitive to the chemical composition of the glass and to the thermal treatment applied during the preparation of the samples. The storage shear modulus G′ and the loss shear modulus G″ were measured at constant temperature between 10−3 and 102 rad/s. The two chosen silicate glass melts have different chemical compositions and, moreover, each of them was prepared with two thermal treatments during the sample molding. In the experimental range of temperature, the viscoelastic properties of the two glass melts are characteristic of the ultimate rheological behavior at low frequencies called the Terminal Zone. We tested the possibility of building the rheological master curve for the two liquids over a wi...
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Thermal effects on viscoelastic properties of silicate glass melts
Journal of Chemical Physics, 2003Co-Authors: Ph. Tordjeman, J. M. Felio, Laetitia GazagnesAbstract:High-temperature viscoelastic properties of two different silicate glass melts have been measured with a new high-temperature rheometer between 700 °C and 900 °C. Our experiments demonstrate that the viscoelastic properties in the Terminal Zone, a low-frequency domain which has never been explored, are very sensitive to the chemical composition of the glass and to the thermal treatment applied during the preparation of the samples. The storage shear modulus G' and the loss shear modulus G" were measured at constant temperature between 10-3 and 102 rad/s. The two chosen silicate glass melts have different chemical compositions and, moreover, each of them was prepared with two thermal treatments during the sample molding. In the experimental range of temperature, the viscoelastic properties of the two glass melts are characteristic of the ultimate rheological behavior at low frequencies called the Terminal Zone. We tested the possibility of building the rheological master curve for the two liquids over a wide frequency domain. Experiments show that one quenched glass melt has a Maxwell viscoelastic behavior and obeys time-temperature superposition, while the same glass annealed below the glass transition temperature presents changes in the viscoelastic behavior and does not obey time-temperature superposition. The second glass is non-Maxwellian and does not obey time-temperature superposition for the two thermal conditions of molding showing a phase transition, or a structural change transition, between 700 °C and 900 °C. We observed a great influence of the thermal treatment on the viscoelastic properties in the melted state for the two silicates.
