Enthalpy of Fusion of Indium:  A Certified Reference Material for Differential Scanning Calorimetry

Archer, Donald G.; Rudtsch, Steffen

doi:10.1021/je030112g

Cited by 69 publications

(40 citation statements)

References 19 publications

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“…The investigated temperature range was from 350 to 500 K with a heating rate of 10 K min −1 . The DSC was calibrated using a 46.18 mg sample of indium loaded in a steel pan ( T fus = 429.8 K, ∆ fus H = 28.71 J g −1 ) …”

Section: Experimental Methodsmentioning

confidence: 99%

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Near‐Zero Thermal Expansion in In(HfMg)_0.5Mo₃O₁₂

et al. 2012

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In(HfMg)0.5Mo3O12, which can be considered as a 1:1 mole ratio solid solution of the low‐positive thermal expansion material HfMgMo3O12 and the low‐negative thermal expansion (NTE) material In2Mo3O12 was prepared. From DSC and XRPD results, we show that In(HfMg)0.5Mo3O12 exists in a monoclinic (P21/a) structure at low temperature and undergoes a phase transition at ~425 K to an orthorhombic phase (Pnma), with an associated enthalpy change of 0.89 kJ mol−1. Thermal expansion is large and positive in the low‐temperature monoclinic phase (average αℓ = 16 × 10−6 K−1 and 20 × 10−6 K−1, from dilatometry and XRPD, respectively). Remarkably, this material has a near‐zero thermal expansion (ZTE) coefficient over the temperature range ~500 to ~900 K in the high‐temperature orthorhombic phase, both intrinsically and for the bulk sample. The average linear intrinsic (XRPD) value is αℓ = −0.4 × 10−6 K−1, and the average bulk (dilatometric) value is αℓ = 0.4 × 10−6 K−1 with an uncertainty of ± 0.2 × 10−6 K−1. The slight difference between intrinsic and bulk thermal expansion is attributed to microstructural effects. XRPD results show that the thermal expansion is more isotropic than for the parent compounds HfMgMo3O12 and In2Mo3O12.

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Section: Experimental Methodsmentioning

confidence: 99%

“…The DSC was calibrated using a 46.18 mg sample of indium loaded in a steel pan (T fus = 429.8 K, Δ fus H = 28.71 J g À1 ). 34…”

Section: Experimental Methodsmentioning

confidence: 99%

Near‐Zero Thermal Expansion in In(HfMg)_0.5Mo₃O₁₂

et al. 2012

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“…[1] The instrument was calibrated by using indium standard (fusion temperature ¼ 156.61 C and fusion enthalpy ¼ 28.67 J=g). [32] The software associated with the instrument (TA Universal Analysis 2000) was used to analyze the DSC thermograms. The extent of denaturation was determined using change of enthalpy (DH) from 52 to 97 C.…”

Section: Sample Preparation and Spray Dryingmentioning

confidence: 99%

Denaturation and Physical Characteristics of Spray-Dried Whey Protein Isolate Powders Produced in the Presence and Absence of Lactose, Trehalose, and Polysorbate-80

et al. 2015

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The denaturation (loss of protein through aggregation and/or change in secondary structure) and physical characteristics such as powder morphology, particle size and size distribution, amorphous/crystalline behavior, and solubility of whey protein isolate (WPI) were investigated in a spray-drying process. The protective efficacy of sugars (lactose and trehalose) and low-molecular-weight surfactant polysorbate-80 (Tween-80) on the secondary structure (b-turn, b-sheet and a-helix) and physical characteristics of spray-dried WPI was quantified. The WPI, WPIþsugar, and WPIþTween-80 formulations were spray dried maintaining the total solids at 10% (w/w). The inlet and outlet temperatures were maintained at 180 and 80 C, respectively. The results showed that the loss of protein through denaturation and aggregation was not significant (p > 0.05). However, a significant (p < 0.05) alteration of the secondary structural elements was observed. Due to spray drying of WPI without protectants, the b-sheet and b-turn were decreased by 4.4 and 14.5%, respectively, and the random coil increased by 20.7%. The a-helix of WPI remained unaltered during the spray-drying process. The presence of Tween-80 effectively protected the a-helix and b-sheet but the b-turn remained vulnerable and was decreased. No significant (p > 0.05) change in the solubility of WPI was observed due to spray drying. Spray drying of WPIþsugar produced essentially amorphous particles. The dried powder particles were spherical with wrinkled or folded surface.

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“…Heats of fusion from DSC were calibrated with an indium reference standard (∆H fus = 28.66 J/g) [18]. Approximately 10 µl (~13 mg) of sample were hermetically sealed in aluminum DSC pans.…”

Section: Methodsmentioning

confidence: 99%

Agile Thermal Management STT-RX. Towards High Energy Density, High Conductivity Thermal Energy Storage Composites (PREPRINT)

Shamberger¹,

Forero²

2011

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING/MONITORING AGENCY REPORT NUMBER(S)AFRL-RX-WP-TP-2011-4417 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTESThe U.S. Government is joint author of this work and has the right to use, modify, reproduce, release, perform, display, or disclose the work. PA Case Number and clearance date: 88ABW-2011-5381, 11 Oct 2011. Preprint journal article to be submitted to Proceedings of the ASME 2012 3rd Micro/Nanoscale Heat & Mass Transfer International Conference, March 3-6, 2012, Atlanta, Georgia. This document contains color. © 2011 by ASME ABSTRACTThermal energy storage (TES) materials absorb transient pulses of heat, allowing for rapid storage of low-quality thermal energy for later use, and effective temperature regulation as part of a thermal management system. This paper describes recent development of salt hydrate-based TES composites at the Air Force Research Laboratory. Salt hydrates are known to be susceptible to undercooling and chemical segregation, and their bulk thermal conductivities remain too low for rapid heat transfer. Here, we discuss recent progress towards solving these challenges in the composite system lithium nitrate trihydrate/graphitic foam. This system takes advantage of both the high volumetric thermal energy storage density of lithium nitrate trihydrate and the high thermal conductivity of graphitic foams. We demonstrate a new stable nucleation agent specific to lithium nitrate trihydrate which decreases undercooling by up to ~70% relative to previously described nucleation agents. Furthermore, we demonstrate the compatibility of lithium nitrate trihydrate and graphitic foam with the addition of a commercial nonionic silicone polyether surfactant. Finally, we show that thermal conductivity across water-graphite interfaces is optimized by tuning the surfactant concentration. These advances demonstrate a promising route to synthesizing high energy density, high thermal conductivity TES composites. ABSTRACTThermal energy storage (TES) materials absorb transient pulses of heat, allowing for rapid storage of low-quality thermal energy for later use, and effective temperature regulation as part of a thermal management system. This paper describes recent development of salt hydrate-based TES composites at the Air Force Research Laboratory. Salt hydrates are known to be susceptible to undercooling and chemical segregation, and their bulk thermal conductivities remain too low for rapi...

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Enthalpy of Fusion of Indium: A Certified Reference Material for Differential Scanning Calorimetry

Cited by 69 publications

References 19 publications

Near‐Zero Thermal Expansion in In(HfMg)_0.5Mo₃O₁₂

Near‐Zero Thermal Expansion in In(HfMg)_0.5Mo₃O₁₂

Denaturation and Physical Characteristics of Spray-Dried Whey Protein Isolate Powders Produced in the Presence and Absence of Lactose, Trehalose, and Polysorbate-80

Agile Thermal Management STT-RX. Towards High Energy Density, High Conductivity Thermal Energy Storage Composites (PREPRINT)

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Enthalpy of Fusion of Indium: A Certified Reference Material for Differential Scanning Calorimetry

Cited by 69 publications

References 19 publications

Near‐Zero Thermal Expansion in In(HfMg)0.5Mo3O12

Near‐Zero Thermal Expansion in In(HfMg)0.5Mo3O12

Denaturation and Physical Characteristics of Spray-Dried Whey Protein Isolate Powders Produced in the Presence and Absence of Lactose, Trehalose, and Polysorbate-80

Agile Thermal Management STT-RX. Towards High Energy Density, High Conductivity Thermal Energy Storage Composites (PREPRINT)

Contact Info

Product

Resources

About

Near‐Zero Thermal Expansion in In(HfMg)_0.5Mo₃O₁₂

Near‐Zero Thermal Expansion in In(HfMg)_0.5Mo₃O₁₂