title: Sheets of large superhydrophobic metal particles self assembled on water by the Cheerios effect

authors: Larmour, Iain A.

subjects: hydrophobic effect

abstract: Surface tension in water gives rise to a variety of phenomena some of which, such as the rise of water inside hydrophilic tubes under capillary action or the ability of pond skaters to walk on the surface of water, are so familiar that they seldom excite comment. However, there is still potential for new insights and discoveries to be made in this area. Two recent examples are the discovery that liquid marbles can be prepared by coating solvent droplets with powder and the elucidation of a general mechanism for the attraction of buoyant objects in liquids, the  Cheerios effect . Here we report a method for preparing large (up to 0.4 mm diameter) superhydrophobic copper particles and show that these particles, which have extraordinarily large contact angles but are much denser than water, give rise to a range of striking effects, including the ability to self assemble into sheets which can support objects that normally sink in water.

text: Sheets of large superhydrophobic metal particles self assembled on water by the Cheerios effect Surface tension in water gives rise to a variety of phenomena some of which, such as the rise of water inside hydrophilic tubes under capillary action or the ability of pond skaters to walk on the surface of water, are so familiar that they seldom excite comment. However, there is still potential for new insights and discoveries to be made in this area. Two recent examples are the discovery that liquid marbles can be prepared by coating solvent droplets with powder and the elucidation of a general mechanism for the attraction of buoyant objects in liquids, the  Cheerios effect . Here we report a method for preparing large (up to 0.4 mm diameter) superhydrophobic copper particles and show that these particles, which have extraordinarily large contact angles but are much denser than water, give rise to a range of striking effects, including the ability to self assemble into sheets which can support objects that normally sink in water.

year: 2008

title: Characterisation of hemp fibre reinforced Poly(Lactic Acid) composites

authors: Sawpan, Moyeenuddin Ahmad

subjects: fibre reinforced composites

abstract: In this work, the mechanical properties including tensile strength, flexural strength, impact strength and fracture toughness of the PLA/hemp composites were investigated over a range of fibre content (0-30 wt.%). It was observed that, the tensile strength and Young's modulus of the composites increased with increased fibre content. The flexural strength did not increase with fibre reinforcement, however, the flexural modulus of the composites increased significantly. Impact strength of the composites increased up to 20 wt. % fibre loading, however, further increased fibre loading caused a reduction of impact strength. KIc and GIc values decreased with increased fibre content.

text: Characterisation of hemp fibre reinforced Poly(Lactic Acid) composites In this work, the mechanical properties including tensile strength, flexural strength, impact strength and fracture toughness of the PLA/hemp composites were investigated over a range of fibre content (0-30 wt.%). It was observed that, the tensile strength and Young's modulus of the composites increased with increased fibre content. The flexural strength did not increase with fibre reinforcement, however, the flexural modulus of the composites increased significantly. Impact strength of the composites increased up to 20 wt. % fibre loading, however, further increased fibre loading caused a reduction of impact strength. KIc and GIc values decreased with increased fibre content.

year: 2009

title: Supervision as cultural partnership: Contributions to dialogue

authors: Crocket, Kathie

abstract: The term cultural supervision has been coined as part of a strategy that implicates supervision in the support and development of culturally appropriate therapeutic practice. In Aotearoa New Zealand particular focus has been given to supervision where the client is Māori and the practitioner is a member of the dominant Pākehā culture particularly, or of other non-Māori cultures. However, while the phrase cultural supervision has entered common professional parlance, the practice has had little research attention in counselling/psychotherapy in New Zealand. Cultural supervision appears to encompass a range of understandings, and there is no clear agreement about practice implications. It is unclear what alignment there is between aspirations, regulations, and practice. This article reports on an exploratory qualitative study that investigated how supervision might work in supporting culturally appropriate counselling practice in Aotearoa New Zealand. The study’s findings are presented as a multi-voiced dialogue. This arts-based representational practice enacts the uncertainties of post-colonial experience. Its intention is to make assumptions, ideas, and practices available for discussion. Its contribution is to join current dialogue about supervision and culture, and to raise further questions about how supervision and culturally appropriate practice come together.

text: Supervision as cultural partnership: Contributions to dialogue The term cultural supervision has been coined as part of a strategy that implicates supervision in the support and development of culturally appropriate therapeutic practice. In Aotearoa New Zealand particular focus has been given to supervision where the client is Māori and the practitioner is a member of the dominant Pākehā culture particularly, or of other non-Māori cultures. However, while the phrase cultural supervision has entered common professional parlance, the practice has had little research attention in counselling/psychotherapy in New Zealand. Cultural supervision appears to encompass a range of understandings, and there is no clear agreement about practice implications. It is unclear what alignment there is between aspirations, regulations, and practice. This article reports on an exploratory qualitative study that investigated how supervision might work in supporting culturally appropriate counselling practice in Aotearoa New Zealand. The study’s findings are presented as a multi-voiced dialogue. This arts-based representational practice enacts the uncertainties of post-colonial experience. Its intention is to make assumptions, ideas, and practices available for discussion. Its contribution is to join current dialogue about supervision and culture, and to raise further questions about how supervision and culturally appropriate practice come together.

year: 2015