### Abstract

Microfibril angle, (MFA) in hardwood is one of the key determinants of solid timber performance due to its strong influence on the stiffness, strength, shrinkage, swelling, thermal-dynamics mechanical properties and dimensional stability of wood.. A method is presented for the measurement, using small-angle X-ray scattering (SAXS), of the microfibril angle, (MFA) and the associated standard deviation for the cellulose microfibrils in the S_{2} layer of the cell walls of Acacia mangium wood. The length and orientation of the microfibrils of the cell walls in the irradiated volume of the thin samples are measured using SAXS and scanning electron microscope, (SEM). The undetermined parameters in the analysis are the MFA, (M) and the standard deviation (σ_{φ}) of the intensity distribution arising from the wandering of the fibril orientation about the mean value. Nine separate pairs of values are determined for nine different values of the angle of the incidence of the X-ray beam relative to the normal to the radial direction in the sample. The results show good agreement. The curve distribution of scattered intensity for the real cell wall structure is compared with that calculated with that assembly of rectangular cells with the same ratio of transverse to radial cell wall length. It is demonstrated that for β = 45°, the peaks in the curve intensity distribution for the real and the rectangular cells coincide. If this peak position is φ_{45}, Then the MFA can be determined from the relation M = tan-1 (tan φ_{45} / cos 45°), which is precise for rectangular cells. . Here we shall present our results of the MFA in the cell wall with respect to its shape and structure as an important fast check and yet accurate towards the quality of wood, its uses and application.

Original language | English |
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Title of host publication | Lecture Notes in Engineering and Computer Science |

Pages | 2016-2019 |

Number of pages | 4 |

Volume | 3 LNECS |

Publication status | Published - 2013 |

Event | 2013 World Congress on Engineering, WCE 2013 - London Duration: 3 Jul 2013 → 5 Jul 2013 |

### Other

Other | 2013 World Congress on Engineering, WCE 2013 |
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City | London |

Period | 3/7/13 → 5/7/13 |

### Fingerprint

### Keywords

- Acacia mangium
- MFA
- Microfibril angle
- Rectangular cell wall and real cell wall
- Small-angle x-ray scattering

### ASJC Scopus subject areas

- Computer Science (miscellaneous)

### Cite this

*Lecture Notes in Engineering and Computer Science*(Vol. 3 LNECS, pp. 2016-2019)

**Analysis of microfibril angle in acacia mangium wood using small-angle x-ray scattering.** / Tabet, Tamer A.; Aziz, Fauziah Abdul; Radiman, Shahidan.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Lecture Notes in Engineering and Computer Science.*vol. 3 LNECS, pp. 2016-2019, 2013 World Congress on Engineering, WCE 2013, London, 3/7/13.

}

TY - GEN

T1 - Analysis of microfibril angle in acacia mangium wood using small-angle x-ray scattering

AU - Tabet, Tamer A.

AU - Aziz, Fauziah Abdul

AU - Radiman, Shahidan

PY - 2013

Y1 - 2013

N2 - Microfibril angle, (MFA) in hardwood is one of the key determinants of solid timber performance due to its strong influence on the stiffness, strength, shrinkage, swelling, thermal-dynamics mechanical properties and dimensional stability of wood.. A method is presented for the measurement, using small-angle X-ray scattering (SAXS), of the microfibril angle, (MFA) and the associated standard deviation for the cellulose microfibrils in the S2 layer of the cell walls of Acacia mangium wood. The length and orientation of the microfibrils of the cell walls in the irradiated volume of the thin samples are measured using SAXS and scanning electron microscope, (SEM). The undetermined parameters in the analysis are the MFA, (M) and the standard deviation (σφ) of the intensity distribution arising from the wandering of the fibril orientation about the mean value. Nine separate pairs of values are determined for nine different values of the angle of the incidence of the X-ray beam relative to the normal to the radial direction in the sample. The results show good agreement. The curve distribution of scattered intensity for the real cell wall structure is compared with that calculated with that assembly of rectangular cells with the same ratio of transverse to radial cell wall length. It is demonstrated that for β = 45°, the peaks in the curve intensity distribution for the real and the rectangular cells coincide. If this peak position is φ45, Then the MFA can be determined from the relation M = tan-1 (tan φ45 / cos 45°), which is precise for rectangular cells. . Here we shall present our results of the MFA in the cell wall with respect to its shape and structure as an important fast check and yet accurate towards the quality of wood, its uses and application.

AB - Microfibril angle, (MFA) in hardwood is one of the key determinants of solid timber performance due to its strong influence on the stiffness, strength, shrinkage, swelling, thermal-dynamics mechanical properties and dimensional stability of wood.. A method is presented for the measurement, using small-angle X-ray scattering (SAXS), of the microfibril angle, (MFA) and the associated standard deviation for the cellulose microfibrils in the S2 layer of the cell walls of Acacia mangium wood. The length and orientation of the microfibrils of the cell walls in the irradiated volume of the thin samples are measured using SAXS and scanning electron microscope, (SEM). The undetermined parameters in the analysis are the MFA, (M) and the standard deviation (σφ) of the intensity distribution arising from the wandering of the fibril orientation about the mean value. Nine separate pairs of values are determined for nine different values of the angle of the incidence of the X-ray beam relative to the normal to the radial direction in the sample. The results show good agreement. The curve distribution of scattered intensity for the real cell wall structure is compared with that calculated with that assembly of rectangular cells with the same ratio of transverse to radial cell wall length. It is demonstrated that for β = 45°, the peaks in the curve intensity distribution for the real and the rectangular cells coincide. If this peak position is φ45, Then the MFA can be determined from the relation M = tan-1 (tan φ45 / cos 45°), which is precise for rectangular cells. . Here we shall present our results of the MFA in the cell wall with respect to its shape and structure as an important fast check and yet accurate towards the quality of wood, its uses and application.

KW - Acacia mangium

KW - MFA

KW - Microfibril angle

KW - Rectangular cell wall and real cell wall

KW - Small-angle x-ray scattering

UR - http://www.scopus.com/inward/record.url?scp=84887944583&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84887944583&partnerID=8YFLogxK

M3 - Conference contribution

SN - 9789881925299

VL - 3 LNECS

SP - 2016

EP - 2019

BT - Lecture Notes in Engineering and Computer Science

ER -