Dulce Wendolyn Bollás | Instituto Tecnológico de Zacatepec (original) (raw)
Address: Cuernavaca, Morelos, Mexico
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Papers by Dulce Wendolyn Bollás
Physical Review B, 2006
The wave-number dependence upon stress and/or strain and temperature of two adjacent optical phon... more The wave-number dependence upon stress and/or strain and temperature of two adjacent optical phonons of aramid fibers has been investigated. The results showed that both phonons soften considerably under axial tension. Experiments at various temperatures under fixed strain conditions have demonstrated that one of the phonons ͑ 1 = 1611 cm −1 ͒ is moderately anharmonic whereas the adjacent phonon ͑ 2 = 1648 cm −1 ͒ exhibits harmonic behavior. By modeling the fibers as one-dimensional molecular wires very good agreement between experiment and theory is obtained for the phonon temperature dependence under isostress conditions.
Chemical Physics Letters, 2003
The Raman response of aramid fibers is examined as a function of the applied stress and temperatu... more The Raman response of aramid fibers is examined as a function of the applied stress and temperature. Noticeable wavenumber shifts are recorded for the 1611 and 1648 cm À1 Raman bands with increasing stress. In contrast, only the 1611 cm À1 band is affected by temperature within the )50 to 200°C range. The existence of two adjacent vibrational modes sensitive to stress with only one of the two being temperature dependent, allows the development of a simultaneous stress and temperature spectroscopic sensor. The applicability of this sensor is evaluated on an epoxy resin -aramid fiber composite activated by a shape-memory-alloy actuator.
Over the past ten years, scientific and technological advances have established biocatalysis as a... more Over the past ten years, scientific and technological advances have established biocatalysis as a practical and environmentally friendly alternative to traditional metallo-and organocatalysis in chemical synthesis, both in the laboratory and on an industrial scale. Key advances in DNA sequencing and gene synthesis are at the base of tremendous progress in tailoring biocatalysts by protein engineering and design, and the ability to reorganize enzymes into new biosynthetic pathways. To highlight these achievements, here we discuss applications of protein-engineered biocatalysts ranging from commodity chemicals to advanced pharmaceutical intermediates that use enzyme catalysis as a key step.
Physical Review B, 2006
The wave-number dependence upon stress and/or strain and temperature of two adjacent optical phon... more The wave-number dependence upon stress and/or strain and temperature of two adjacent optical phonons of aramid fibers has been investigated. The results showed that both phonons soften considerably under axial tension. Experiments at various temperatures under fixed strain conditions have demonstrated that one of the phonons ͑ 1 = 1611 cm −1 ͒ is moderately anharmonic whereas the adjacent phonon ͑ 2 = 1648 cm −1 ͒ exhibits harmonic behavior. By modeling the fibers as one-dimensional molecular wires very good agreement between experiment and theory is obtained for the phonon temperature dependence under isostress conditions.
Chemical Physics Letters, 2003
The Raman response of aramid fibers is examined as a function of the applied stress and temperatu... more The Raman response of aramid fibers is examined as a function of the applied stress and temperature. Noticeable wavenumber shifts are recorded for the 1611 and 1648 cm À1 Raman bands with increasing stress. In contrast, only the 1611 cm À1 band is affected by temperature within the )50 to 200°C range. The existence of two adjacent vibrational modes sensitive to stress with only one of the two being temperature dependent, allows the development of a simultaneous stress and temperature spectroscopic sensor. The applicability of this sensor is evaluated on an epoxy resin -aramid fiber composite activated by a shape-memory-alloy actuator.
Over the past ten years, scientific and technological advances have established biocatalysis as a... more Over the past ten years, scientific and technological advances have established biocatalysis as a practical and environmentally friendly alternative to traditional metallo-and organocatalysis in chemical synthesis, both in the laboratory and on an industrial scale. Key advances in DNA sequencing and gene synthesis are at the base of tremendous progress in tailoring biocatalysts by protein engineering and design, and the ability to reorganize enzymes into new biosynthetic pathways. To highlight these achievements, here we discuss applications of protein-engineered biocatalysts ranging from commodity chemicals to advanced pharmaceutical intermediates that use enzyme catalysis as a key step.