2006-2007 - Kennedy Space Center Technology Transfer Office

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Reversible Chemochromic Hydrogen DetectorsThe Florida Solar Energy Center (FSEC), affiliated with the University of CentralHazardous-LeakDetection and Florida, has invented a reversible pigment that changes from light beige to blue whenIsolation exposed to hydrogen and back to light beige when exposed to atmospheric oxygen.In laboratory and environmental studies, the FSEC pigment in its tape form failed tochange color adequately when exposed to hydrogen after one day of exposure at Kennedy SpaceCenter’s Beach Corrosion Test Facility. The reversible hydrogen-detecting tape also lost its ability tochange color after being placed in an environmental chamber at 45 °C for one day. The first attemptsat extruding the reversible pigment into various polymers were unsuccessful because of the pigment’spoor thermal stability. The goal of this project was to formulate a pigment with improved thermaland environmental stability for extrusion into a variety of appropriate polymer matrices.The formulation of the reversible hydrogen-detecting pigment was modified by removing onereagent and chemically modifying the hydrogen sensitive ingredient. This was intended to improvethe hydrophobicity of the pigment and alter the thermal degradation mechanism. A sensor with thenew pigment was placed in an oven at 45 °C for 3 days. The figure shows how the newly formulatedpigment changed color (∆E) as it was exposed to 100 percent hydrogen. A larger ∆E indicates agreater color difference. The maximum ∆E for the modified sensor decreases by less than 2 followingheat treatment when compared to an unheated sample. With a similar heat treatment, the originalreversible pigment lost its sensitivity to hydrogen, since the maximum ∆E attained is less than 3.After changing color when heated to 45°C, the modified pigment was extruded at high temperaturesinto a tape. The extruded tape retained its color-changing ability.Preliminary results show that the hydrophobicity of the FSEC pigment increases after the pigmenthas been modified; however, further testing is required to validate long-term results in a relevantenvironment.Contacts: Dr. Janine E. Captain , NASA-KSC, (321) 867-6970; andDr. Luke B. Roberson , NASA-KSC, (321) 867-1543Participating Organizations: NASA-KSC (Dr. Robert C. Youngquist), Florida Solar Energy Center(Dr. Gary Bokerman, Jessica Macpherson, Dr. Nahid Mohajeri, Dr. Nazim Muradov, and Dr. Ali T-Raissi), ASRCAerospace (Barbara V. Peterson), and University of Central Florida (Cristina M. Berger and Dr. Mary C. Whitten)Spaceport Structures and Materials
20181614∆ E1210Modified Sensor Before Heat TreatmentModified Sensor After Heat TreatmentUnmodified Sensor After Heat Treatment864200 100 200 300 400 500Time (s)Comparison of the detection performance sensors in 100 percent hydrogen.KSC Technology Development and Application 2006-2007
Page 5 and 6: ForewordSuccessful technology devel
Page 7 and 8: ContentsSpaceport Structures and Ma
Page 9 and 10: Contents (continued)Process and Hum
Page 11 and 12: IntroductionJohn F. Kennedy Space C
Page 13 and 14: Constellation SystemsSurfaceSystems
Page 15: Spaceport Structures and MaterialsK
Page 19 and 20: Initial results of the EDEM model o
Page 21 and 22: Contacts: Dr. Carlos I. Calle ,NASA
Page 23 and 24: Close examination of the corrosions
Page 25 and 26: Adhesion at Failure (psi)2500200015
Page 27 and 28: Figure 1. After 500 hours of salt f
Page 29 and 30: Contacts: Dr. Paul E. Hintze , NASA
Page 31 and 32: Figure 2. Repairs to various types
Page 33 and 34: on top of the cuvette contains the
Page 35 and 36: Figure 2. A corrugated NiTi sheet e
Page 37 and 38: The PLTD can be used to (1) calibra
Page 39 and 40: SEM images of neat MWNT fibers: (a)
Page 41 and 42: Contacts: Trent M. Smith
Page 43 and 44: Figure 1. An isometric cutaway view
Page 45 and 46: Figure 2. Quartz sand flowing in th
Page 47 and 48: Figure 2. Top images show how the e
Page 49 and 50: Sand volume fraction contour at t =
Page 51 and 52: Integrated LWRD/RVC engineering bre
Page 53 and 54: Mean relative percentage change in
Page 55 and 56: We compared the model’s predictio
Page 57 and 58: Figure 2. Three-dimensional simulat
Page 59 and 60: Figure 3. Camera calibration model.
Page 61 and 62: The sketch in Figure 2 shows alaunc
Page 63: Figure 2. Signal generator (right)
Page 66 and 67:
Hail Size Distribution MappingA 3-D
Page 68 and 69:
Launch Pad 39 Hail Monitor Array Sy
Page 70 and 71:
Autonomous Flight Safety System - P
Page 72 and 73:
The Photogrammetry CubeSpaceport/Ra
Page 74 and 75:
Bird Vision SystemThe Bird Vision s
Page 76 and 77:
Automating Range Surveillance Throu
Page 78 and 79:
Next-Generation Telemetry Workstati
Page 80 and 81:
GPS Metric Tracking UnitAs Global P
Page 82 and 83:
Space-Based RangeSpace-Based Range
Page 85 and 86:
Fluid System TechnologiesKSC Techno
Page 87 and 88:
0.900.850.80Discharge Coefficient,
Page 89 and 90:
Composite seals for performance eva
Page 91 and 92:
140000120000100000Signal80000600004
Page 93 and 94:
Contacts: Dr. Barry J. Meneghelli ,
Page 95 and 96:
60555045Comparative k-value (mW/m-K
Page 97 and 98:
a compatible spacecraft model where
Page 99 and 100:
In an ongoing effort for improvemen
Page 101:
Low-gravity probe prototype test.th
Page 104 and 105:
Countermeasure for Radiation Protec
Page 106 and 107:
Focused Metabolite Profiling for Di
Page 109 and 110:
Process and Human FactorsEngineerin
Page 111 and 112:
DON uses game technology to enable
Page 113 and 114:
Type of mobile crane that impacted
Page 115 and 116:
SALT proof-of-concept communication
Page 117 and 118:
SSLM CAD model.Our design offers th
Page 119 and 120:
Variables that can be integrated by
Page 121:
Exploration Supply Chain Simulation
Page 124 and 125:
Nanosensors for Evaluating Hazardou
Page 126 and 127:
Sixty-four-Channel Inline Cable Tes
Page 128 and 129:
Wireless Inclinometer Calibration S
Page 130 and 131:
Generating Safety-Critical PLC Code
Page 132 and 133:
Spacecraft Electrostatic Radiation
Page 134 and 135:
Ion Beam Propulsion StudySpacecraft
Page 136 and 137:
RT-MATRIX: Measuring Total Organic
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Appendix AKSC High-Priority Technol
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Risk Assessment ToolMission Data Fe
Page 143 and 144:
Appendix BInnovative Partnership Pr
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system for the Government, using th
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tracking objects after launch, and
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2006-2007 - Kennedy Space Center Technology Transfer Office

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