Development of molecular adsorber coatings

Straka, Sharon A.; Peters, Wanda; Hasegawa, Mark M.; Novo-Gradac, Kevin J.; Wong, Alfred K. K.

doi:10.1117/12.864483

Cited by 6 publications

(5 citation statements)

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“…It is a new type of contamination cleaning technology on orbit [9], making use of porous materials to reduce the location contamination of the spacecrafts. It can protect the sensitive equipments and the safety of the cosmonauts, and it is small, light, and no-power.…”

Section: Resultsmentioning

confidence: 99%

Research on Adsorption Performance of Porous Materials Based on Ceramics to Organic Molecular Contamination

Yuan

Pang³

et al. 2019

Adv. Astronaut. Sci. Technol.

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In the space environment, spacecraft on orbit released a series of organic gas molecules by means of material outgassing, vacuum outgassing, eliminating propellant, and so on. These gas molecules can deposit on sensitive surface by direct transportation, reflection, atmospheric-scattering transportation, self-scattering transportation, and thermalization atmospheric-scattering transportation, such as optical elements, thermal control coating, and solar cell, which can result in decrease of the property even out of work. Contamination control was the trend of long-life and high-reliability spacecraft. As a new type of contamination control technology, molecular adsorber based on ceramics with convenient measuring, lightweight, low power consumption is a useful way of controlling contamination of spacecraft-sensitive device. There is not any study on molecular adsorber, although the molecular contamination test and simulation analysis have been researched by many people in China. This article analyses the adsorption mechanism study of porous material to organic molecular contamination in vacuum and studies the adsorption property study of porous material to organ-molecular contamination in vacuum. Through the method study of molecular adsorber absorption capability, the development of molecular adsorber is suggested.

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Section: Resultsmentioning

confidence: 99%

Research on Adsorption Performance of Porous Materials Based on Ceramics to Organic Molecular Contamination

Yuan

Pang³

et al. 2019

Adv. Astronaut. Sci. Technol.

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“…A wide range of organic and inorganic binders have been used in combination with zeolites to shape them and enhance their mechanical properties [ 27 , 28 , 29 , 30 , 31 , 32 ]. Regarding zeolite coatings, inorganic binders (colloidal suspensions LUDOX ® ) were employed by NASA to develop zeolite coatings for organic pollutants trapping in orbit [ 33 , 34 ]. Silicone resins were also used in the elaboration of zeolite coatings for thermal applications and good bonding performances were obtained on different aluminum alloy substrates [ 9 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Volatile Organic Compounds by FAU-Type Zeolite Coatings

Diboune

Nouali

Soulard³

et al. 2020

Molecules

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Silicone and pure organic binders were used to develop FAU-type zeolite coatings applied on pre-treated aluminum substrates by using a spraying method and then cured under specific conditions. The influence of the amount of binder on adhesion properties of zeolite coatings was first investigated to determine the optimum ratio between zeolite and binder. Zeolite coatings were then elaborated with a high zeolite content (between 70 and 80 wt.%) to ensure high adsorption capacities. The amount of binders involved in different zeolite coatings was sufficient to achieve interesting adhesion and cohesion properties. The accessibility of zeolite microporosity was studied by nitrogen adsorption-desorption measurements, which revealed a very small or no loss of the micropore volume for the optimized coatings. Volatile Organic Compounds (VOCs) adsorption measurements were carried out using n-hexane as probe molecule. FAU-type zeolite in powder form adsorbs 180 mg/ganhydrous zeolite, whereas the amounts of n-hexane adsorbed by zeolite coatings ranged from 131 to 175 mg/ganhydrous zeolite.

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“…However, as seen in Figure 2, adsorber pucks require the use of additional hardware for installation that results in size, weight, and cost related concerns. 1 For example, the mounting hardware is often times very bulky and can contribute to additional mass loading to the spacecraft. It is costly to fabricate and manufacture and thereby, can easily impact the project budget.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, it is imperative to mitigate the risk of on-orbit molecular contamination. 1 The current solution to protect sensitive surfaces from outgassed materials is through the use of adsorber pucks. As illustrated in Figure 1, adsorber pucks are constructed of honeycomb patterned ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

Development and testing of molecular adsorber coatings

2012

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The effect of on-orbit molecular contamination has the potential to degrade the performance of spaceflight hardware and diminish the lifetime of the spacecraft. For example, sensitive surfaces, such as optical surfaces, electronics, detectors, and thermal control surfaces, are vulnerable to the damaging effects of contamination from outgassed materials. The current solution to protect these surfaces is through the use of zeolite coated ceramic adsorber pucks. However, these pucks and its additional complex mounting hardware requirements result in several disadvantages, such as size, weight, and cost related concerns, that impact the spacecraft design and the integration and test schedule. As a result, a new innovative molecular adsorber coating was developed as a sprayable alternative to mitigate the risk of on-orbit molecular contamination.In this study, the formulation for molecular adsorber coatings was optimized using various binders, pigment treatment methods, binder to pigment ratios, thicknesses, and spray application techniques. The formulas that passed coating adhesion and vacuum thermal cycling were further tested for its adsorptive capacity. Accelerated molecular capacitance tests were performed in an innovatively designed multi-unit system containing idealized contaminant sources. This novel system significantly increased the productivity of the testing phase for the various formulations that were developed. Work performed during the development and testing phases has demonstrated successful application of molecular adsorber coatings onto metallic substrates, as well as, very promising results for the adhesion performance and the molecular capacitance of the coating. Continued testing will assist in the qualification of molecular adsorber coatings for use on future contamination sensitive spaceflight missions.

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Development of molecular adsorber coatings

Cited by 6 publications

References 0 publications

Research on Adsorption Performance of Porous Materials Based on Ceramics to Organic Molecular Contamination

Research on Adsorption Performance of Porous Materials Based on Ceramics to Organic Molecular Contamination

Efficient Removal of Volatile Organic Compounds by FAU-Type Zeolite Coatings

Development and testing of molecular adsorber coatings

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