Nano Volume Research Articles

Perspectives of Microstructure Refinement of Aluminum and Its Alloys by the Reciprocating Extrusion (Cyclic Extrusion Compression-CEC).

This paper presents a study on the perspectives of structure refinement of aluminum and its alloys by reciprocating extrusion (cyclic extrusion compression—CEC). The study included Al99.5 and Al99.992 aluminum and AlMg5 and AlCu4Zr alloy. Aluminum and alloys were deformed by reciprocating extrusion (CEC) in the strain range ϕ = 0.42 (1 CEC cycle) to ϕ = 59.8 (67 CEC cycles). After deformation, the structure of the specimens was investigated by optical microscopy (OM) and transmission electron microscopy (TEM), which revealed that the primary mechanism of hardening, over the range of applied strains, was the result of the propagation of shear bands throughout the specimens. The intersection of shear bands was found to divide the volume of the specimens into nano and microvolumes with dimensions limited by the width of the microbands. Due to structure renewal processes such as polygonization and dynamic geometric recrystallization, the formed micro and nano volumes were transformed into nano and micrograins with large misorientation angles. In terms of the occurrence of grain microstructure, a sustained uniform level of hardening was found, which was defined as steady-state flow. The research has shown that the steady state of flow is a result of the competitive interaction between the processes of hardening and structure renewal. The higher the metal purity, the higher the intensity of the structure renewal processes was. The formation of new grains and their growth under dynamic and post-dynamic recrystallization was observed in Al99.992 aluminum, in which high purity of the metal and high strain accumulation caused the growth of new grains at room temperature.

In Nano Volume 15, Issue 5

In Nano Volume 15, Issue 5

In Nano Volume 14, Issue 10

ADVERTISEMENT RETURN TO ISSUEPREVIn NanoNEXTIn Nano Volume 14, Issue 10Christen BrownleeChristen BrownleeMore by Christen BrownleeCite this: ACS Nano 2020, 14, 10, 12267–12270Publication Date (Web):October 27, 2020Publication History Published online27 October 2020Published inissue 27 October 2020https://doi.org/10.1021/acsnano.0c08582Copyright © 2020 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views456Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (4 MB) Get e-AlertsSUBJECTS:Immunology,Peptides and proteins,Molecules,Biopolymers,Post-translational modification Get e-Alerts

In Nano Volume 14, Issue 6

ADVERTISEMENT RETURN TO ISSUEPREVIn NanoNEXTIn Nano Volume 14, Issue 6Christen BrownleeChristen BrownleeMore by Christen BrownleeCite this: ACS Nano 2020, 14, 6, 6362–6365Publication Date (Web):June 23, 2020Publication History Published online23 June 2020Published inissue 23 June 2020https://doi.org/10.1021/acsnano.0c04713Copyright © 2020 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views548Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (3 MB) Get e-AlertsSUBJECTS:Crystals,Cholesterol,Luminescence,Genetics,Materials Get e-Alerts

In Nano Volume 14, Issue 4

In Nano Volume 14, Issue 4

Nano volume fractionation strategy for dilute-and-shoot injections in off-line loss-less proteomic workflows for extensive protein identifications of ultra-low sample amounts

A proteomic workflow for a simple loss-less manual nano-fractionation (300 nL/fraction) for low µg sample amounts which avoids the need to dry down or transfer fractions to autosampler vials is shown to be feasible. It is demonstrated that the conventional procedure of drying samples down followed by reconstitution negatively affects the number of protein and peptide identifications. Furthermore, these losses seem to disproportionately affect hydrophobic peptides from the drying down and reconstitution step. By collecting and concatenating the fractions while the outlet of the column is submerged in a small predefined volume of 0.2% formic acid, the content of acetonitrile in the collecting vials was lowered such that it was compatible with direct injection for the online analysis. This additionally resulted in a time gain of approx. an hour for the total fractionation time. Acetonitrile concentrations up to 7.5% do not seem to compromise the chromatographic performance in the online analysis. Using as little as 2 µg digested HeLa lysate, approx. 7000 protein groups could be easily identified with 2 or more unique peptides. This was the case when fractionation was performed at pH 10 as well as at pH 5.5.

In Nano Volume 13, Issue 5

ADVERTISEMENT RETURN TO ISSUEPREVIn NanoNEXTIn Nano Volume 13, Issue 5Christen BrownleeChristen BrownleeMore by Christen BrownleeCite this: ACS Nano 2019, 13, 5, 4865–4868Publication Date (Web):May 28, 2019Publication History Published online28 May 2019Published inissue 28 May 2019https://doi.org/10.1021/acsnano.9b03594Copyright © 2019 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views596Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (4 MB) Get e-AlertsSUBJECTS:Antigens,Genetics,Infectious diseases,Nanoparticles,Scaffolds Get e-Alerts

Retraction: "Intercalated Polyaniline/Halloysite Nanocomposites by a Solvent-Free Mechanochemical Method"

This article has been retracted. A statement of retraction is published in Nano Volume 11, Issue 12 (2016).

In Nano Volume 10, Issue 10

In Nano Volume 10, Issue 10

Intercalated Polyaniline/Halloysite Nanocomposites by a Solvent-Free Mechanochemical Method

This article has been retracted. A statement of retraction is published in Nano Volume 11, Issue 12 (2016).

Transfer of Ultra-Thin Semi-Conductor Films onto Flexible Substrates

Applying tensile strain on an undirect band gap semiconductor crystal is a very promising way to tune it into a direct band gap [1] , [2] . This basic feature can be an outstanding progress for the use of classical semiconductor as silicon or germanium in interesting optoelectronic applications [3] . One way to apply a tensile strain is to transfer an ultra-thin of semiconductor onto a flexible substrate [4] (erg: an organic polymer). The goal of this paper is to propose a simple way to obtain an ultra-thin silicon film (<200 nm) onto an expendable polymer. It consists in transferring an Unibond™ SOI silicon thin film onto a classical tape maintain by a dicing frame. This process is mainly based on classical temporary bonding process. As shown on figure, a first process is carried out onto 200 mm wafer with a SOI silicon film of 200nm and a buried oxide box of 400nm. No default is observed on the full stack after the grinding and etching steps used to remove the SOI backside substrate. No SiO2trace is also observed after the last dioxide etching. The thin silicon film is then characterized and no crack is observed. The stack is then laminated onto a frame with a Furukawa SP-537T-230 adhesive tape. The demounting of the carrier is easy and no default appears on the silicon film. The last process consists in removing the glue from the silicon. We obtain a 200 nm silicon film bonded onto the tape. Nevertheless, this glue removal leads to the appearance of some cracks ono the silicon thin film. A second process will then be presented in order to avoid the last glue removal steps and improving the final thin film quality. XRR characterizations of the transfered thin film will be presented as well as potential amount of tensile stress achievable with this unique structure. [1] Ju Li et al., MRS Bulletin, 39, pp 108-114, 2014 [2] Feng Zhang et al., Phys. Rev. Lett. 102, 2009 [3] Diode Lasers and Photonic Integrated Circuits, Second Edition, 2012 John Wiley & Sons, chap 4 [4]& Salvatore Giovanni A.et al., ACS NANO Volume 7, Issue: 10, P8809-8815, 2013 Figure 1

The movement of molecules and nanoparticles in potential field with the Casimir force in nano volumes with different optical boundaries

This work is devoted to the problem of dynamics of molecules and nanoparticles in fields in following potentials: the Casimir force, the van der Waals interactions, the Coulomb potential for charged particles, the potential energies for bonds, and the electric potential. In the general case, molecules or nanoparticles move in nano volumes with walls of different optical properties. In particular, the matter at boundary can be with zero refracted index (Vesseur E J R et al 2013 Phys. Rev. Lett. 110 013902; Uvarova L A 2005 AIP congress). Current model can be used to investigate dynamical and configuration properties of particle systems, and to determine influences of molecules interactions with the walls. It is accepted that the Casimir force affects the velocity distribution function, the total energy, and equilibrium properties that produce rise of temperature, pressure and energy deviations. In many-atom molecules or nanoparticles interactions with the Casimir force are more complex, but they give opportunity to control admixtures and modification of system under the influence of electromagnetic waves.

A Microfluidic Sensor Dedicated to Microwave Dielectric Spectroscopy of Liquids Medium and Flowing Colloidal Suspension

This paper presents a RF biosensor able to perform analysis on nano volumes of liquids or on flowing colloidal solutions. Once properly calibrated this sensor allows measuring the intrinsic dielectric properties of unknown liquid medium and even individual characteristics of flowing particles. In the aim to guide the liquid and precisely locate the dielectric particles to analyze, a microfluidic network has been developed and implemented on the RF sensor. First characterizations done on small volumes of liquids with our sensor have showed a good agreement with macro measurements done using a coaxial probe. To demonstrate its sensing capabilities, a 3D electromagnetic simulation of the developed sensor in the presence of polystyrene beads located in the sensing area has been performed and results in potential high detection sensitivity. This opens attractive prospects in the frame of microwave dielectric spectroscopy on living cells.

In Nano Volume 5, Issue 4

ADVERTISEMENT RETURN TO ISSUEPREVIn NanoNEXTIn Nano Volume 5, Issue 4Cite this: ACS Nano 2011, 5, 4, 2417–2418Publication Date (Web):April 26, 2011Publication History Published online26 April 2011Published inissue 26 April 2011https://doi.org/10.1021/nn201178xCopyright © 2011 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views496Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (2 MB) Get e-AlertsSUBJECTS:Nanowires,Oxides,Polymerization,Solar cells,Substrates Get e-Alerts

High-Throughput Automated System for Crystallizing Membrane Proteins in Lipidic Mesophases

A high-throughput robotic system has been developed to enable the automatic handling of nanoliter volumes of highly viscous biomaterials for crystallizing membrane proteins using lipidic mesophases. The in meso method introduced a few years ago has produced crystal structures of a number of important membrane proteins. The bottleneck to achieve high throughput automation of this, so-called in meso method, is the handling of nanoliter volumes of the highly viscous cubic phase as part of the crystallization process. The cubic phase sticks to everything that it has contact with and has a tendency to disable dispensing robotic tools. In this paper, we discuss the factors that influence the successful and automatic delivery of nanoliter volumes of the cubic phase. A creative cubic-phase-based coordinate measuring mechanism is presented for controlling the dispensing distance of the cubic phase which is critically important for the successful performance of the system. A mathematical model describing the cubic-phase delivery is proposed and verified. We also present the optimization of liquid handling parameters for the successful and automatic delivery of different precipitant solutions. The performance characteristics of the robotic system in terms of accuracy and reproducibility of delivering nano volumes of highly viscous biomaterials and micro volumes of different precipitant solutions are reported. Note to Practitioners-Automatic handling of nanoliter volumes of highly viscous biomaterials is a practically challenging yet important task in research-and-development activities of biology and drug industry, including protein crystallization. The latter, however, is a key step for determining the structure of the proteins. Only when the structure of the proteins is revealed, can one understand the function of the proteins and/or develop drugs to cure various kinds of diseases. This paper uses a practical project, crystallizing membrane proteins using lipidic mesophases, as an example to develop approaches for automatically handling highly viscous biomaterials. This paper presents the factors that influence the successful and automatic delivery of nanoliter volumes of viscous biomaterials and introduces a new coordinate measuring mechanism using the viscous biomaterials for controlling the dispensing distance of the biomaterials, which is critical for the successful delivery of viscous materials. A mathematical model describing the delivery of viscous material is for guiding the design of practical delivering systems. This paper also presents a number of parameters for successful and automatic delivery of different precipitant solutions which are involved in the biomaterial screening activities in drug development and biological research. A simple and effective computer vision approach for measuring the volume of bio-solutions and biomaterials in the nanoliter scale is presented which is verified by the fluorescence intensity measurement of the delivered samples. The performance of the automatic system developed in terms of accuracy and reproducibility of delivering nanovolumes of highly viscous biomaterials is reported which proves that the proposed approach is not only practically useful but also feasible for many applications

Prospects of Resonant Optical Antennas for Nano-Analysis

Suitably shaped metal nano structures act as resonant optical antennas that efficiently collect light and confine it to a subwavelength volume. Vice versa, light emission from nano volumes can be enhanced by coupling to antenna structures. We give a short introduction to antenna theory and discuss recent experiments that show the feasibility of achieving strong field enhancement using resonant dipole antennas for near infrared wavelengths. By scanning an optical antenna fabricated at the apex of an AFM tip over individual quantum dots, we observe enhanced emission of the latter while it is in close proximity of the antenna feed gap. Resonant optical antennas hold promise to be applied for spectroscopic characterization of nano structures with high spatial resolutions and single-molecule sensitivity.