Macropore-Size Distributions in Some Typical Porous Substances

Drake, Leonard C.; Ritter, Hanna

doi:10.1021/i560148a014

Cited by 117 publications

(33 citation statements)

References 5 publications

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“…This puts extra demand on the characterization method. Historically different techniques have been used to characterize pulp porosity, exemplified by gas adsorption (Emmett and De Witt 1941) and mercury intrusion (Drake and Ritter 1945). Unfortunately, these techniques are inferior when it comes to semi-soft materials like fibers.…”

Section: Pulp Porosimetrymentioning

confidence: 99%

NMR cryoporometry to study the fiber wall structure and the effect of drying

et al. 2009

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NMR cryoporometry has been used for investigating the porosity changes of bleached wood pulp upon drying. This NMR method follows the same principles as thermoporosimetry, which has been used for the same purpose during the last decade and makes it possible to investigate porous material in the water-swollen state. In this study bleached softwood kraft pulp was exposed to a series of drying procedures where the decrease in porosity within the fiber cell wall could be characterized for pore radii below 100 nm. This decrease in porosity is called hornification, which is an irreversible collapse of the fiber wall structure during drying and results in decreased uptake of water and reduced swelling of the fiber upon rewetting. Our results have been compared to the traditionally used water retention value (WRV) and correlates well with these. Furthermore, this NMR method could show the reduction of hornification when adsorbing the hemicellulose glucuronoxylan to the fiber.

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Section: Pulp Porosimetrymentioning

confidence: 99%

NMR cryoporometry to study the fiber wall structure and the effect of drying

et al. 2009

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“…Equation implies that as pressure increases, mercury will be intruded into progressively smaller pores. For each pressure increment, mercury is forced into the accessible soil pores of a diameter larger than or equal to that which is calculated by Equation Drake and Ritter (1945) and Garcia-Bengochea (1978) , the PSD and pore size density function can be derived as follow :…”

Section: List Of Figuresmentioning

confidence: 99%

“…Such predictive equations 13 have had only limited success for coarser soils and have proved to be unsatisfactory for fine-grained soils. Efforts to refine this approach by introducing empirical grain shape and packing parameters have not won general acceptance (Hillel, 1980 …”

Section: Jomentioning

confidence: 99%

“…Hence Equation (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) can be rewritten as: The term G(x.) defined in Equation (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) (4)(5)(6)(7)(8)(9)(10)(11)(12) . A subroutine called "CADRE" in the Purdue University CDC 6500-6600 computer library was utilized to carry out this numerical integration.…”

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confidence: 99%

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Pore Size Distribution of Sandy Soils and the Prediction of Permeability : Interim Report

Juang¹

1981

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“…The cement content of the specimens, C, was calcula ted from the relationship C= w;(l + i), (2) where w, is the ignited weight of the hydrated specimen, and i is the fractional ignition loss of the original cement.…”

Section: Determination Of Volume and Cement Content Of Specimensmentioning

confidence: 99%

Behavior of cements and related materials under hydrostatic pressures up to 10,000 atmospheres

Weir¹,

Hunt²,

Blaine³

1956

J. RES. NATL. BUR. STAN.

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Compression studies were made o n harde ned cement pastes at 21 0 C a nd a t press ures as high as 10,000 atmospheres. The effects of composit io n, age, m oisture co nte nt, and water-ceme nt ra tio were s tudied. Compressibility of dried portla nd cement p astes appeared to proceed t hrough a maximum wi t h increased cure, the existence or location of t he maximum being d epende nt on t he water-ceme nt ratio. Compression of both portland a nd aluminous ceme nts increased wi th increasing e vaporable water co nte nt. Portla nd ceme nts with evaporable water conte nts in t he range 17. 5 to 32.4 perce n t exhibited a t ransit io n between 2,000 and 3,000 atmospheres. N o similar effect occm ed in a luminous ceme nt. Experiments indicated t hat t he t rans it io n was a ttributable to h ydrated lime formed in t he po rt la nd cem ent. Average co mpressibilities of dri ed paste were 3.1 X 10-6 a nd 2.2 X 10-6 atm-I bet wee n 1 and 5, 000 a t mospheres and betwee n 5, 000 a nd 10,000 atmospheres, res pectively. Co mpress io n tudies were a lso mad e wi t h wet s ilica gel, h ydrated t ricalcillm s ili cate, a nd dr y a nd wet calcium h ydrox id e.

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Macropore-Size Distributions in Some Typical Porous Substances

Cited by 117 publications

References 5 publications

NMR cryoporometry to study the fiber wall structure and the effect of drying

NMR cryoporometry to study the fiber wall structure and the effect of drying

Pore Size Distribution of Sandy Soils and the Prediction of Permeability : Interim Report

Behavior of cements and related materials under hydrostatic pressures up to 10,000 atmospheres

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