Influence of Particle Size on Physicochemical Properties of Pharmaceutical Powders. I. On Fluidity of Sodium Borate and Boric Acid Powders. (1).

Kaneniwa, Nobuyoshi; Ikekawa, Akiko; Aoki, Haruko

doi:10.1248/cpb.15.1441

Cited by 10 publications

(2 citation statements)

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“…The angle of repose (AOR) has proved to be a useful property for characterising the flow of powders [1][2][3][4][5][6][7]. Unlike other flowability parameters, such as the cohesion, which require the execution of a series of long tests, the measurement of AOR can be finished within about 15 minutes.…”

Section: Importance and Definition Of Angle Of Reposementioning

confidence: 99%

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Characterising Semi‐Cohesive Powders using angle of repose

Wouters

Geldart

1996

Part & Part Syst Charact

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When properly measured and interpreted angle of repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper. The second part of the paper describes the improvements made to a measuring device developed originally for measuring the angle of repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device's funnel has been eliminated. A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart's classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.

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Section: Importance and Definition Of Angle Of Reposementioning

confidence: 99%

“…According to Kaneniwa et id. [6] this led to a kink in their graph of log(tan AOR) versus particle size, D, at a critical particle size, Dc. However, there is some disagreement about the size dependence of the AOR.…”

Section: Measuring Angle Of Reposementioning

confidence: 99%