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Micro & Nano Letters, IET

Issue 2 • Date June 2007

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Displaying Results 1 - 6 of 6
  • Bending characteristics of SU-8

    Page(s): 20 - 23
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (413 KB)  

    This study characterises SU-8's material properties under large deformations in out-of-plane bending. A novel test setup is presented to deform the SU-8 to high levels, and a mathematical model presented that accurately predicts the results. This test shows that hard-baked SU-8, with a Young's modulus tested at 1.9 GPa, is capable of undergoing stresses of up to 120 MPa before failure and in some cases will undergo plastic deformation. View full abstract»

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  • Peptide aerogels comprising self-assembling nanofibrils

    Page(s): 24 - 29
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (550 KB)  

    Bioinspired molecular self-assembly is a popular route to novel functional materials for industrial applications. Here we explore, for the first time, the possibility of using organogel and hydrogels of short self-assembling beta-sheet-forming peptides, as starting states for the creation of nanostructured peptide aerogels. The effects of supercritical fluid drying (SCF) and freeze-drying (FD) on the nanofibrillar peptide gel network were investigated. SCF processing was found to cause collapse of peptide organogel networks, presumably because of peptide insolubility in carbon dioxide (CO2). Freeze-drying of peptide hydrogels proved a more efficient method of removing the solvent without destroying the self-assembled fibrillar network, leading to a microscopic aligned lamellar structure consisting of thousands of stacked peptide nanofibrils. These chiral, nanostructured, low-density aerogels are characterised by chemical versatility and regular display of functional groups on their surface. Appropriately designed peptides can also be triggered to self-assemble in situ inside other porous structures and impart biological-like functionality for catalysis, sensing, separation and filtration applications, or tissue engineering. View full abstract»

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  • Versatile methodology for generating size-controlled composite micrometer beads capsulating nanomaterials

    Page(s): 30 - 34
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (262 KB)  

    Our developmental investigations into aerodynamically assisted jetting have previously shown great promise (Jayasinghe and Suter in Micro and Nano Letts., 2006, 1, 35) in materials science and engineering. This processing approach is currently undergoing rapid development where it will join other related jet-based processes such as ink-jet printing and electrospraying with which the precision deposition of droplet residues (containing a wide variety of micro-and nanomaterials) is most useful in micro-and nanosciences. The ability for capsulating nanomaterials (having a mean particulate size of 5 nm) as micrometer-sized composite beads is demonstrated. Investigations reported here show the influence of the applied aerodynamic forces to the chamber or flow rate to the needle, respectively, having effect on the generated composite bead sizes, their distributions and on the jetting characteristics. These investigations imply the versatility of this processing science for capsulating a wide variety of nano-sized materials as composite beads for applications ranging from the formation of stable emulsions to a route for controlled delivery of drugs, which would be most useful to the pharmaceutical industry. View full abstract»

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  • Inductance of mixed carbon nanotube bundles

    Page(s): 35 - 39
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    The carbon nanotube (CNT) bundle is a promising candidate for next-generation interconnect/via applications. A realistic CNT bundle is a mixture of single-wall and multi-wall CNTs and its performance analysis needs to consider both kinds of CNTs. The inductances of the mixed CNT bundles are estimated, which are in agreement with the recent experimental results. Impacts of different parameters such as tube density, tube distribution, metallic tube ratio and bundle dimensions are discussed, providing an important guideline to design and fabricate a CNT bundle with a desirable inductance performance. View full abstract»

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  • Three-dimensional CMOL: three-dimensional integration of CMOS/nanomaterial hybrid digital circuits

    Page(s): 40 - 45
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (573 KB)  

    The CMOS molecular (CMOL) circuit is a promising hybrid structure incorporating the nanowire crossbar into the CMOS integrated circuit (IC) implementation. In this letter, a novel three-dimensional (3D) architecture of the CMOL circuit is introduced. This structure eliminates the special pin requirement of the original CMOL designs, providing a feasible and efficient solution to build the practical CMOL circuits. In this 3D structure, the density of the nanowire crossbar is doubled. Such a high-density implementation enables the 3D CMOL technology to leap ahead of the IC roadmap by more than three generations. View full abstract»

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  • Nested boron nitride and carbon-boron nitride nanocones

    Page(s): 46 - 49
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (341 KB)  

    In this letter we extend previously established results for nested carbon nanocones to both nested boron nitride and carbon-boron nitride nanocones. Based purely on mechanical principles and classical mathematical modelling techniques, we determine the energetically favourable structures for nested boron nitride and carbon-boron nitride nanocones. While only three apex angles for boron nitride tend to occur, we also consider the other two angles corresponding to the equivalent carbon nanocones. Two nanocones are assumed to be located co-axially in a vacuum environment. The Lennard-Jones parameters for boron nitride and carbon-boron nitride systems are calculated using the standard mixing rule. For the boron nitride cones, numerical results indicate that the interspacing between two cones is approximately 3.4 Aring which is comparable with the experimental results. For the hybrid carbon-boron nitride cones, the numerical results essentially depend on the outer cone angle, and the interspacing distance is also obtained to be approximately 3.4 Aring. Moreover, the equilibrium position is such that one cone is always inside the other, and therefore nested double-cones are possible in practice. View full abstract»

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Aims & Scope

Micro & Nano Letters offers express publication of short research papers presenting research conducted at the forefront of micro- and nanoscale science, engineering and technology, with at least one dimension ranging from a few tens of micrometres to a few nanometres.

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Meet Our Editors

Editors-in-Chief
Professor Gwo-Bin Vincent Lee
National Tsing-Hua University, Taiwan

Professor Peter Dobson
University of Oxford, UK