Specific Heat of Pyrex Glass from 25° to 175° C.<sup>1</sup>

Vries, Thos. De

doi:10.1021/ie50246a017

Cited by 9 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these calculations, a surface-averaged emissivity of 0.92 is assumed for borosilicate glass, and 0.1 for the solder covering the glass surface along with a view factor ( F 1→2 ) of unity, since the inner shield completely encloses the central part of capillary. The heat capacity of the central node was estimated from data for the heat capacity of borosilicate glass. , The calculated parameters are shown as a function of the inner shield temperature in Figure . To confirm the validity of these estimates, we ran a set of calibration experiments and compared the measured total thermal conductance and thermal time constant with those predicted by our thermal model (Figure ).…”

Section: Thermal Model and Characterization Of The Calorimetermentioning

confidence: 99%

“…(b) Modeled thermal capacitance ( C cm ) and the thermal time constant (τ) along with the measured thermal time constant of the calorimeter. The modeled capacitance is calculated using two different relations for heat capacity of borosilicate glass obtained from refs and .…”

Section: Thermal Model and Characterization Of The Calorimetermentioning

confidence: 99%

“…The heat capacity of the central node was estimated from data for the heat capacity of borosilicate glass. 19,20 The calculated parameters are shown as a function of the inner shield temperature in Figure 6. To confirm the validity of these estimates, we ran a set of calibration experiments and compared the measured total thermal conductance and thermal time constant with those predicted by our thermal model (Figure 5).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Microwatt-Resolution Calorimeter for Studying the Reaction Thermodynamics of Nanomaterials at High Temperature and Pressure

et al. 2020

View full text Add to dashboard Cite

Calorimetry of reactions involving nanomaterials is of great current interest, but requires high-resolution heat flow measurements and long-term thermal stability. Such studies are especially challenging at elevated reaction pressures and temperatures. Here, we present an instrument for measuring the enthalpy of reactions between gas-phase reactants and milligram scale nanomaterial samples. This instrument can resolve the net change in the amount of gas-phase reactants due to surface reactions in an operating range from room temperature to 300 °C and reaction pressures of 10 mbar to 30 bar. The calorimetric resolution is shown to be <3 μW/√Hz, with a long-term stability <4 μW/hour. The performance of the instrument is demonstrated via a set of experiments involving H2 absorption on Pd nanoparticles at various pressures and temperatures. For this specific reaction, we obtained a mass balance resolution of 0.1 μmol/√Hz. Results from these experiments are in good agreement with past studies establishing the feasibility of performing high resolution calorimetry on milligram scale nanomaterials, which can be employed in future studies probing catalysis, phase transformations, and thermochemical energy storage.

show abstract

Section: Thermal Model and Characterization Of The Calorimetermentioning

confidence: 99%

Section: Thermal Model and Characterization Of The Calorimetermentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Microwatt-Resolution Calorimeter for Studying the Reaction Thermodynamics of Nanomaterials at High Temperature and Pressure

et al. 2020

View full text Add to dashboard Cite

show abstract

“…We measured its H I65 -H25 to be 122.7 J/g whi c h, when combined with the ds /dt of 0.001311 J . g-I .O C -2 determined by de Vries [33], gives the equation (10) for the specific heat of Pyrex glass in J . g-I .…”

Section: (9)mentioning

confidence: 99%

Heats of reaction of natural rubber with sulfur

Bekkedahl¹,

Weeks²

1969

J. RES. NATL. BUR. STAN. SECT. A.

View full text Add to dashboard Cite

An adiabatiecopper ca l? rim e ter wa s used to determine th e heats of vul ca niza ti o n of pal e c re~e natura l rubber wIth s ulfur for mIxtures varying in com pos iti o n from 0 to 32 pe rce nt added s ulfur. The s id e rea ction that produces hydroge n s ulfide was avoided by us in " reacti on te mpe ratures near 155°C. Heat s of reac tion at 25°C and at ] 55 °C are re ported. Th e e nth~py c han ge at 25°C for co mpound s con talllln g up to about 18 pe rce nt s ulfur is given in joules per gra m of vu lca nizate by th e eq uatlon , !::J.H1o =-2 1. ]· 5 with a s tandard dev iation of 11 J ig. He re 5 is th e percentage of co mbin ed s ulfur. Above 18 pe rcen t s ulfur th e heat of reacti o n at 25°C remains app roxima te ly co ns tant a t 380 :!: 8 J ig. A co m~ari so n is made between th e hea t of vu lca nization and th e vo lu me c han "e on vulca ni zation , both as fun c tion s of com bin ed s ulfur , b y making use of data in th e lit e rature. 0 Key words: Aneroid ca lorim e ter; ca lorimeter; hea t of vu lca niza tion; hea t meas ure me nts; rubb er; rubb er-s ulfur reactIon ; vo lum e chan ge on vul ca nintion ; vu lca ni za tion.

show abstract

“…Thus, normalΔ T = T normalF − T normalC The energy gained as heat by the water is Q normalw normala normalt normale normalr = m normalw c normalw ( T F − T I , W ) where m w is the mass of water, c w is the specific heat of liquid water (4.18 J g –1 K –1 ), T I,w is the initial temperature of the water, and T F is the final temperature of the water. Similarly, the energy gained by the beaker is Q normalg normall normala normals normals = m normalg c normalg ( T F − T I , g ) where m g is the mass of the beaker, c g is the specific heat of glass (0.78 J g –1 K –1 ), T I,g is the initial temperature of the beaker, and T F is the final temperature of the beaker. It is noted that the beaker and water are at the same initial temperature ( T I,w = T I,g ).…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Curie Temperature of Nickel Using a Simple Thermodynamic Analysis

Kuntzleman

2023

J. Chem. Educ.

View full text Add to dashboard Cite

An activity is described that uses simple materials and an easy-to-perform protocol to estimate the Curie temperature of nickel, which is the temperature at which nickel loses its ferromagnetism. To do so, an object made of nickel metal is heated with a lighter until it loses its ferromagnetism. The metal is allowed to drop into a beaker that contains a known amount of water at a known temperature. Thermodynamic analysis of the exchange of energy between the metal, water, and beaker allows for an estimate of the Curie temperature of nickel. The activity provides students with the opportunity to explore concepts commonly found in introductory and general chemistry curricula, including thermodynamics and electronic configurations of the elements.

show abstract

Specific Heat of Pyrex Glass from 25° to 175° C.¹

Cited by 9 publications

References 0 publications

Microwatt-Resolution Calorimeter for Studying the Reaction Thermodynamics of Nanomaterials at High Temperature and Pressure

Microwatt-Resolution Calorimeter for Studying the Reaction Thermodynamics of Nanomaterials at High Temperature and Pressure

Heats of reaction of natural rubber with sulfur

Estimation of the Curie Temperature of Nickel Using a Simple Thermodynamic Analysis

Contact Info

Product

Resources

About

Specific Heat of Pyrex Glass from 25° to 175° C.1

Cited by 9 publications

References 0 publications

Microwatt-Resolution Calorimeter for Studying the Reaction Thermodynamics of Nanomaterials at High Temperature and Pressure

Microwatt-Resolution Calorimeter for Studying the Reaction Thermodynamics of Nanomaterials at High Temperature and Pressure

Heats of reaction of natural rubber with sulfur

Estimation of the Curie Temperature of Nickel Using a Simple Thermodynamic Analysis

Contact Info

Product

Resources

About

Specific Heat of Pyrex Glass from 25° to 175° C.¹