Terry Haas - Academia.edu (original) (raw)
Papers by Terry Haas
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Chemischer Informationsdienst, 1972
Theoretische Bindungslängenbetrachtungen lassen ebenso wie IR‐ und Raman‐ Daten aus der Literatur... more Theoretische Bindungslängenbetrachtungen lassen ebenso wie IR‐ und Raman‐ Daten aus der Literatur darauf schließen, daß in festem cyclischem (WOF4)4 die W‐Atome nicht über symmetrische Brücken aus O‐Atomen, sondern über F ‐Brückenatome miteinander verbunden sind.
SPIE Proceedings, 1987
In the development and production of transparent multilayer solid-state ionic structures, and in ... more In the development and production of transparent multilayer solid-state ionic structures, and in particular, electrochromic Smart Window the measurement of electron and ion transport properties of the layers is essential, since it can determine the feasibility as well as the speed of operation of devices with those layers. We are developing a novel electro-optical technique to measure the ion and electron mobilities of several layers of the electrochromic Smart WindowTM glass essentially in situ. Presented in this paper are the technique, preliminary models, and transport properties of two such films.
MRS Proceedings, 1995
ABSTRACTLPCVD thin films of lithium cobalt oxide (LiCoO2) were grown using tertbutyllithium (t-Bu... more ABSTRACTLPCVD thin films of lithium cobalt oxide (LiCoO2) were grown using tertbutyllithium (t-BuLi) and cyclopentadienyl cobalt dicarbonyl (CoCp(CO)2) as precursors in a cold-walled vertical reactor. Deposition rates were found to be as high as 25 A/s. Lithium to cobalt ratios (Li/Co) in the films were found to increase with increasing Ar carrier gas flow rates in the t-BuLi line while they were found to decrease with increasing system pressure. Electrochemical measurements show typical film open circuit voltages (OCV) for as-prepared films to be between 3.30 and 3.60 V vs. Li. Atomic Force Microscopy shows a striated, crystalline film formed at substrate temperatures (Ts) as low as 400 C with grain sizes as large as 200 nm in length.
MRS Proceedings, 1998
ABSTRACTPolycrystalline thin films of lithium cobalt oxide (nominally LiCo02) have been deposited... more ABSTRACTPolycrystalline thin films of lithium cobalt oxide (nominally LiCo02) have been deposited by a process which we have named, ion beam directed assembly (IBDA). It is similar to ion assisted deposition (IAD) or ion beam assisted deposition (IBAD), but the major difference is that in IBDA the ion beam directs, via the vector momenta of the ions, rather than merely assists, the growth. Hence, we also term the process directed assembly to distinguish it from self assembly. Also, in directed assembly the ions may or may not become an integral part of the film's composition.In this paper we wish to show that the IBDA process may be capable of controlling microstructure, e.g., in the case of polycrystalline films, control the orientations of the crystallites. For LiCoO2 we have observed this in two ways - by X-ray analysis, and electrochemically, by lithium diffusivity measurements. In particular, we have observed increased lithium diffusivities (≥ 10−8 cm 2/s) in IBDA deposited...
Solar Energy Materials, 1985
Electrically variable reflectivity electrochromic windows have the potential to significantly red... more Electrically variable reflectivity electrochromic windows have the potential to significantly reduce heating and cooling loads in buildings. The importance of reducing the optical frequencies free electron scattering in the variable reflectivity electrochromic layer will be shown. Based on spectroscopic ellipsometry studies and an analysis of the dynamical resistivity of polycrystalline films of colored WO 3 and of single crystals of NaxWO 3, it is tentatively concluded that the principal source of free electron scattering in WO 3 films is structural disorder, and probably crystallographic shear planes which act as monopolar dislocations. This is in contrast to the much higher reflectivity of single crystal tungsten bronzes for which the more dominant scattering mechanism appears to be that associated with ionized impurities. We therefore conclude that it should be possible to improve the reflectivity modulation in films of electrochromic WO3, and consequently that a practical variable reflectivity electrochromic window should be achievable.
Acta Crystallographica Section E Structure Reports Online, 2006
The crystal structure of the title compound, C36H40N2O2, has been determined at 173 (2) K. The mo... more The crystal structure of the title compound, C36H40N2O2, has been determined at 173 (2) K. The molecule has C 2 symmetry and the asymmetric unit contains one half-molecule. An intramolecular O—H...N hydrogen bond is formed between the phenol OH group and the Schiff base N atom.
Solar Energy Materials, 1987
It is shown that practical spectrally-selective transmittance modulation can be achieved with thi... more It is shown that practical spectrally-selective transmittance modulation can be achieved with thin (50-100 nm) WO3 films, and therefore such films should be useful for fabricating electrochromic windows. The transmittance and reflectance modulation results are compared with theoretical predictions. The results indicate an excess intraband absorbance, which is attributed to free electron scattering arising from extended defects.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Related Article: Seth A. Sharber, Rom Nath Baral, Fanny Frausto, Terry E. Haas, Peter Muller, Sam... more Related Article: Seth A. Sharber, Rom Nath Baral, Fanny Frausto, Terry E. Haas, Peter Muller, Samuel W. Thomas III|2017|J.Am.Chem.Soc.|139|5164|doi:10.1021/jacs.7b00878
Journal of Materials Education, 2006
We report on our summer internship program in Polymer-Based Nanocomposites, for deaf and hard of ... more We report on our summer internship program in Polymer-Based Nanocomposites, for deaf and hard of hearing undergraduates who engage in classroom and laboratory research work in polymer physics. The unique attributes of this program are its emphasis on: 1. Teamwork; 2. Performance of a start-to-finish research project; 3. Physics of materials approach; and 4. Diversity. Students of all disability levels have participated in this program, including students who neither hear nor voice. The classroom and laboratory components address the materials chemistry and physics of polymer-based nanocomposites, crystallization and melting of polymers, the interaction of X-rays and light with polymers, mechanical properties of polymers, and the connection between thermal processing, structure, and ultimate properties of polymers. A set of Best Practices is developed for accommodating deaf and hard of hearing students into the laboratory setting. The goal is to bring deaf and hard of hearing student...
Although understanding the conformations and arrangements of conjugated materials as solids is ke... more Although understanding the conformations and arrangements of conjugated materials as solids is key to their prospective applications, predictive power over these structural factors remains elusive. In this work, substituent effects tune noncovalent interactions between side-chain fluorinated benzyl esters and main-chain terminal arenes, in turn controlling the conformations and interchromophore aggregation of three-ring phenylene-ethynylenes (PEs). Cofacial fluoroarene−arene (ArF− ArH) interactions cause twisting in the PE backbone, interrupting intramolecular conjugation as well as blocking chromophore aggregation, both of which prevent the typically observed bathochromic shift observed upon transitioning PEs from solution to solid. This work highlights two structural factors that determine whether the ArF−ArH interactions, and the resulting twisted, unaggregated chromophores, occur in these solids: (i) the electron-releasing characteristic of substituents on ArH, with more electro...
Society of Photo- …, 1986
... Publication: Materials and Optics for Solar Energy Conversion and Advanced Lightning Technolo... more ... Publication: Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology. SPIE Proceedings, Vol. 692. Edited by S. Holly and CM Lampert. Bellingham, WA: Society for Photo-Optical Instrumentation Engineers, 1986, p.39. Publication Date: 01/1986. ...
Solar Energy Materials, 1986
The results of recent research on each of the layers of a solid-state multilayer structure for el... more The results of recent research on each of the layers of a solid-state multilayer structure for electrochromic windows are reviewed. This includes a review of the requirements of the multilayer structure for building windows and especially the need to have an electrochemically balanched system. The results indicate that excess free electron scattering in polycrystalline WO3 films (the electrochromatic layer) is not only the source of lower than desired reflectivity modulation, but it is also the major source of higher than desired absorptivity modulation. Research on LiA1F4 indicates that it is a viable candidate for the ion conducting layer, being a good lithium ion conductor and a good electronic insulator. Finally, we have recently discovered that tin-doped and undoped In203 films are mixed conductors, exhibiting lithium ion injection/extraction. This is significant since such films could possibly serve in the dual capacity of counterelectrode and transparent conductor, thereby reducing the complexity, the technical problems, and the cost of electrochromic window assemblies.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Chemischer Informationsdienst, 1972
Theoretische Bindungslängenbetrachtungen lassen ebenso wie IR‐ und Raman‐ Daten aus der Literatur... more Theoretische Bindungslängenbetrachtungen lassen ebenso wie IR‐ und Raman‐ Daten aus der Literatur darauf schließen, daß in festem cyclischem (WOF4)4 die W‐Atome nicht über symmetrische Brücken aus O‐Atomen, sondern über F ‐Brückenatome miteinander verbunden sind.
SPIE Proceedings, 1987
In the development and production of transparent multilayer solid-state ionic structures, and in ... more In the development and production of transparent multilayer solid-state ionic structures, and in particular, electrochromic Smart Window the measurement of electron and ion transport properties of the layers is essential, since it can determine the feasibility as well as the speed of operation of devices with those layers. We are developing a novel electro-optical technique to measure the ion and electron mobilities of several layers of the electrochromic Smart WindowTM glass essentially in situ. Presented in this paper are the technique, preliminary models, and transport properties of two such films.
MRS Proceedings, 1995
ABSTRACTLPCVD thin films of lithium cobalt oxide (LiCoO2) were grown using tertbutyllithium (t-Bu... more ABSTRACTLPCVD thin films of lithium cobalt oxide (LiCoO2) were grown using tertbutyllithium (t-BuLi) and cyclopentadienyl cobalt dicarbonyl (CoCp(CO)2) as precursors in a cold-walled vertical reactor. Deposition rates were found to be as high as 25 A/s. Lithium to cobalt ratios (Li/Co) in the films were found to increase with increasing Ar carrier gas flow rates in the t-BuLi line while they were found to decrease with increasing system pressure. Electrochemical measurements show typical film open circuit voltages (OCV) for as-prepared films to be between 3.30 and 3.60 V vs. Li. Atomic Force Microscopy shows a striated, crystalline film formed at substrate temperatures (Ts) as low as 400 C with grain sizes as large as 200 nm in length.
MRS Proceedings, 1998
ABSTRACTPolycrystalline thin films of lithium cobalt oxide (nominally LiCo02) have been deposited... more ABSTRACTPolycrystalline thin films of lithium cobalt oxide (nominally LiCo02) have been deposited by a process which we have named, ion beam directed assembly (IBDA). It is similar to ion assisted deposition (IAD) or ion beam assisted deposition (IBAD), but the major difference is that in IBDA the ion beam directs, via the vector momenta of the ions, rather than merely assists, the growth. Hence, we also term the process directed assembly to distinguish it from self assembly. Also, in directed assembly the ions may or may not become an integral part of the film's composition.In this paper we wish to show that the IBDA process may be capable of controlling microstructure, e.g., in the case of polycrystalline films, control the orientations of the crystallites. For LiCoO2 we have observed this in two ways - by X-ray analysis, and electrochemically, by lithium diffusivity measurements. In particular, we have observed increased lithium diffusivities (≥ 10−8 cm 2/s) in IBDA deposited...
Solar Energy Materials, 1985
Electrically variable reflectivity electrochromic windows have the potential to significantly red... more Electrically variable reflectivity electrochromic windows have the potential to significantly reduce heating and cooling loads in buildings. The importance of reducing the optical frequencies free electron scattering in the variable reflectivity electrochromic layer will be shown. Based on spectroscopic ellipsometry studies and an analysis of the dynamical resistivity of polycrystalline films of colored WO 3 and of single crystals of NaxWO 3, it is tentatively concluded that the principal source of free electron scattering in WO 3 films is structural disorder, and probably crystallographic shear planes which act as monopolar dislocations. This is in contrast to the much higher reflectivity of single crystal tungsten bronzes for which the more dominant scattering mechanism appears to be that associated with ionized impurities. We therefore conclude that it should be possible to improve the reflectivity modulation in films of electrochromic WO3, and consequently that a practical variable reflectivity electrochromic window should be achievable.
Acta Crystallographica Section E Structure Reports Online, 2006
The crystal structure of the title compound, C36H40N2O2, has been determined at 173 (2) K. The mo... more The crystal structure of the title compound, C36H40N2O2, has been determined at 173 (2) K. The molecule has C 2 symmetry and the asymmetric unit contains one half-molecule. An intramolecular O—H...N hydrogen bond is formed between the phenol OH group and the Schiff base N atom.
Solar Energy Materials, 1987
It is shown that practical spectrally-selective transmittance modulation can be achieved with thi... more It is shown that practical spectrally-selective transmittance modulation can be achieved with thin (50-100 nm) WO3 films, and therefore such films should be useful for fabricating electrochromic windows. The transmittance and reflectance modulation results are compared with theoretical predictions. The results indicate an excess intraband absorbance, which is attributed to free electron scattering arising from extended defects.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Related Article: Seth A. Sharber, Rom Nath Baral, Fanny Frausto, Terry E. Haas, Peter Muller, Sam... more Related Article: Seth A. Sharber, Rom Nath Baral, Fanny Frausto, Terry E. Haas, Peter Muller, Samuel W. Thomas III|2017|J.Am.Chem.Soc.|139|5164|doi:10.1021/jacs.7b00878
Journal of Materials Education, 2006
We report on our summer internship program in Polymer-Based Nanocomposites, for deaf and hard of ... more We report on our summer internship program in Polymer-Based Nanocomposites, for deaf and hard of hearing undergraduates who engage in classroom and laboratory research work in polymer physics. The unique attributes of this program are its emphasis on: 1. Teamwork; 2. Performance of a start-to-finish research project; 3. Physics of materials approach; and 4. Diversity. Students of all disability levels have participated in this program, including students who neither hear nor voice. The classroom and laboratory components address the materials chemistry and physics of polymer-based nanocomposites, crystallization and melting of polymers, the interaction of X-rays and light with polymers, mechanical properties of polymers, and the connection between thermal processing, structure, and ultimate properties of polymers. A set of Best Practices is developed for accommodating deaf and hard of hearing students into the laboratory setting. The goal is to bring deaf and hard of hearing student...
Although understanding the conformations and arrangements of conjugated materials as solids is ke... more Although understanding the conformations and arrangements of conjugated materials as solids is key to their prospective applications, predictive power over these structural factors remains elusive. In this work, substituent effects tune noncovalent interactions between side-chain fluorinated benzyl esters and main-chain terminal arenes, in turn controlling the conformations and interchromophore aggregation of three-ring phenylene-ethynylenes (PEs). Cofacial fluoroarene−arene (ArF− ArH) interactions cause twisting in the PE backbone, interrupting intramolecular conjugation as well as blocking chromophore aggregation, both of which prevent the typically observed bathochromic shift observed upon transitioning PEs from solution to solid. This work highlights two structural factors that determine whether the ArF−ArH interactions, and the resulting twisted, unaggregated chromophores, occur in these solids: (i) the electron-releasing characteristic of substituents on ArH, with more electro...
Society of Photo- …, 1986
... Publication: Materials and Optics for Solar Energy Conversion and Advanced Lightning Technolo... more ... Publication: Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology. SPIE Proceedings, Vol. 692. Edited by S. Holly and CM Lampert. Bellingham, WA: Society for Photo-Optical Instrumentation Engineers, 1986, p.39. Publication Date: 01/1986. ...
Solar Energy Materials, 1986
The results of recent research on each of the layers of a solid-state multilayer structure for el... more The results of recent research on each of the layers of a solid-state multilayer structure for electrochromic windows are reviewed. This includes a review of the requirements of the multilayer structure for building windows and especially the need to have an electrochemically balanched system. The results indicate that excess free electron scattering in polycrystalline WO3 films (the electrochromatic layer) is not only the source of lower than desired reflectivity modulation, but it is also the major source of higher than desired absorptivity modulation. Research on LiA1F4 indicates that it is a viable candidate for the ion conducting layer, being a good lithium ion conductor and a good electronic insulator. Finally, we have recently discovered that tin-doped and undoped In203 films are mixed conductors, exhibiting lithium ion injection/extraction. This is significant since such films could possibly serve in the dual capacity of counterelectrode and transparent conductor, thereby reducing the complexity, the technical problems, and the cost of electrochromic window assemblies.