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https://www.readbyqxmd.com/read/29317019/nanodarts-nanoblades-and-nanospikes-mechano-bactericidal-nanostructures-and-where-to-find-them
#1
REVIEW
Nicholas Lin, Paula Berton, Christopher Moraes, Robin D Rogers, Nathalie Tufenkji
Over the past ten years, a next-generation approach to combat bacterial contamination has emerged: one which employs nanostructure geometry to deliver lethal mechanical forces causing bacterial cell death. In this review, we first discuss advances in both colloidal and topographical nanostructures shown to exhibit such "mechano-bactericidal" mechanisms of action. Next, we highlight work from pioneering research groups in this area of antibacterials. Finally, we provide suggestions for unexplored research topics that would benefit the field of mechano-bactericidal nanostructures...
December 24, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/29298391/room-temperature-magnetic-switching-of-the-electric-polarization-in-ferroelectric-nanopillars
#2
Shashi Poddar, Pedro de Sa, Ronggang Cai, Laurent Delannay, Bernard Nysten, Luc Piraux, Alain M Jonas
Magnetoelectric layers with a strong coupling between ferroelectricity and ferromagnetism offer attractive opportunities for the design of new device architectures such as dual-channel memory and multi-responsive sensors and actuators. However, materials in which a magnetic field can switch an electric polarization are extremely rare, work most often at very low temperatures only, and/or comprise complex materials difficult to integrate. Here, we show that magnetostriction and flexoelectricity can be harnessed to strongly couple electric polarization and magnetism in a regularly nanopatterned magnetic metal/ferroelectric polymer layer, to the point that full reversal of the electric polarization can occur at room temperature by the sole application of a magnetic field...
January 3, 2018: ACS Nano
https://www.readbyqxmd.com/read/29291161/nanotechnology-based-strategies-for-early-cancer-diagnosis-using-circulating-tumor-cells-as-a-liquid-biopsy
#3
REVIEW
Qinqin Huang, Yin Wang, Xingxiang Chen, Yimeng Wang, Zhiqiang Li, Shiming Du, Lianrong Wang, Shi Chen
Circulating tumor cells (CTCs) are cancer cells that shed from a primary tumor and circulate in the bloodstream. As a form of "tumor liquid biopsy", CTCs provide important information for the mechanistic investigation of cancer metastasis and the measurement of tumor genotype evolution during treatment and disease progression. However, the extremely low abundance of CTCs in the peripheral blood and the heterogeneity of CTCs make their isolation and characterization major technological challenges. Recently, nanotechnologies have been developed for sensitive CTC detection; such technologies will enable better cell and molecular characterization and open up a wide range of clinical applications, including early disease detection and evaluation of treatment response and disease progression...
2018: Nanotheranostics
https://www.readbyqxmd.com/read/29259282/analysis-of-killing-of-growing-cells-and-dormant-and-germinated-spores-of-bacillus-species-by-black-silicon-nanopillars
#4
Sonali Ghosh, Shanyuan Niu, Maya Yankova, Matthew Mecklenburg, Stephen M King, Jayakanth Ravichandran, Rajiv K Kalia, Aiichiro Nakano, Priya Vashishta, Peter Setlow
Black silicon (bSi) wafers with a high density of high-aspect ratio nanopillars have recently been suggested to have mechanical bactericidal activity. However, it remains unclear whether bSi with the nanopillars can kill only growing bacterial cells or also dormant spores that are harder to kill. We have reexamined the cidal activity of bSi on growing cells, dormant and germinated spores of B. subtilis, and dormant spores of several other Bacillus species by incubation on bSi wafers with and without nanopillars...
December 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29244713/nanoengineered-interfaces-coatings-and-structures-by-plasma-techniques
#5
EDITORIAL
Krasimir Vasilev, Melanie Macgregor Ramiasa
Nanoparticles, nanotubes, nanobelts, nanoneedles, nanosheets, nanowires, nanopillars: the variety of nanostructured interfaces that can be created and modified using plasma processes is virtually endless.[...].
December 15, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29244655/duplex-imprinted-nano-well-arrays-for-promising-nanoparticles-assembly
#6
Xiangping Li, Andreas Manz
A large area nano-duplex-imprint technique is presented in this contribution using natural cicada wings as stamp. The glassy wings of the cicada, which are abundant in nature, exhibit strikingly interesting nanopillar structures over their membrane. This technique, with excellent performance despite the nonplanar surface of the wings, combines the top-down and bottom-up nanofabrication techniques. It transits micro-nanofabrication from cleanroom environment to bench. Two different materials - dicing tape with acrylic layer and UV optical adhesive - are used to make replications at the same time, thus achieving duplex imprint...
December 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29199816/towards-solid-state-3d-microbatteries-using-functionalized-polycarbonate-based-polymer-electrolytes
#7
Bing Sun, Habtom Desta Asfaw, David Rehnlund, Jonas Mindemark, Leif Nyholm, Kristina Edstrom, Daniel Brandell
3D-microbatteries (3D-MBs) impose new demands for the selection, fabrication and compatibility of the different battery components. Herein, solid polymer electrolytes (SPEs) based on poly(trimethylene carbonate) (PTMC) have been implemented in 3D-MB systems. 3D electrodes of two different architectures, LiFePO4-coated carbon foams and Cu2O-coated Cu nanopillars, have been coated with SPEs and used in Li-cells. Functionalized PTMC with hydroxyl end groups was found to enable uniform and well-covering coatings on LiFePO4-coated carbon foams, which was difficult to achieve for non-functionalized polymers, but the cell cycling performance was limited...
December 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29198117/controlled-formation-of-radial-core-shell-si-metal-silicide-crystalline-heterostructures
#8
Alon Kosloff, Eran Granot, Zahava Barkay, Fernando Patolsky
The highly-controlled formation of 'radial' silicon/NiSi core-shell nanowire heterostructures has been demonstrated for the first time. Here, we investigated the 'radial' diffusion of nickel atoms into crystalline nanoscale silicon pillar cores, followed by nickel silicide phase formation and the creation of a well-defined shell structures. The described approach is based on a two-step thermal process, which involves metal diffusion at low temperatures in the range of 200-400oC, followed by a thermal curing step at a higher temperature of 400oC...
December 3, 2017: Nano Letters
https://www.readbyqxmd.com/read/29192894/photoelectrochemical-studies-of-ingan-gan-mqw-photoanodes
#9
Joshua Butson, Parvathala Reddy Narangari, Siva Krishna Karuturi, Rowena Yew, Mykhaylo Lysevych, Hoe Tan, Chennupati Jagadish
The research interest in photoelectrochemical (PEC) water splitting is ever growing due to its potential to contribute towards clean and portable energy. However, the lack of low energy band gap materials with high photocorrosion resistance is the primary setback inhibiting this technology from commercialisation. The ternary alloy InGaN shows promise to meet the photoelectrode material requirements due to its high chemical stability and band gap tunability. The band gap of InGaN can be modulated from the UV to IR regions by adjusting the In concentration so as to absorb the maximum portion of the solar spectrum...
December 1, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29183997/hyaluronan-content-governs-tissue-stiffness-in-pancreatic-islet-inflammation
#10
Nadine Nagy, Adi de la Zerda, Gernot Kaber, Pamela Y Johnson, Kenneth H Hu, Michael J Kratochvil, Koshika Yadava, Wenting Zhao, Yi Cui, Guadalupe Navarro, Justin P Annes, Thomas N Wight, Sarah C Heilshorn, Paul L Bollyky, Manish J Butte
We have identified a novel role for hyaluronan (HA), an extracellular matrix (ECM) polymer, in governing the mechanical properties of inflamed tissues. We recently reported that insulitis in type 1 diabetes (T1D) of mice and humans is preceded by intra-islet accumulation of HA, a highly hygroscopic polymer. Using the DORmO double transgenic (DO11.10 x RIPmOVA) mouse model of T1D, we asked whether autoimmune insulitis was associated with changes in the stiffness of islets. To measure islet stiffness, we used atomic force microscopy (AFM) and developed a novel "bed of nails"-like approach that uses quartz glass nanopillars to anchor islets, solving a long-standing problem of keeping tissue-scale objects immobilized while performing AFM...
November 28, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29182848/self-recovery-superhydrophobic-surfaces-modular-design
#11
Emanuele Lisi, Matteo Amabili, Simone Meloni, Alberto Giacomello, Carlo Massimo Casciola
Superhydrophobicity, the enhanced hydrophobicity of surfaces decorated with textures of suitable size, is associated with a layer of gas trapped within surface roughness. The reduced liquid/solid contact makes superhydrophobicity attractive for many technological applications. This gas layer, however, can break down with the liquid completely wetting the surface. Experiments have shown that the recovery of the "suspended" superhydrophobic state from the wet one is difficult. Self-recovery-the spontaneous restoring of the gas layer at ambient conditions-is one of the dreams of research in superhydrophobicity as it would allow to overcome the fragility of superhydrophobicity...
December 5, 2017: ACS Nano
https://www.readbyqxmd.com/read/29182157/preparation-of-well-distributed-titania-nanopillar-arrays-on-ti6al4v-surface-by-induction-heating-for-enhancing-osteogenic-differentiation-of-stem-cells
#12
Ning-Bo Li, Sheng-Jun Sun, Han-Ying Bai, Gui-Yong Xiao, Wen-Hua Xu, Jun-Han Zhao, Xin Chen, Yupeng Lu, Yi-Lin Zhang
Great efforts have been recently devoted to prepare nanoscale surfaces on titanium-based implants and achieve clinically fast osteoinduction and osseointegration relayed on the unique characteristics of nanostructure. In this work, we used the induction heating treatment (IHT) as rapid oxidation method to fabricate a porous nanoscale oxide layer on Ti6Al4V surface for better medical application. Well-distributed vertical nanopillars were yielded by IHT for 20-35 s on the alloy surface. The compositions of oxides contained rutile/anatase TiO2 and a small amount of Al2O3 between TiO2 grain boundaries (GBs)...
November 28, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29162927/dislocation-multiplications-in-extremely-small-hexagonal-structured-titanium-nanopillars-without-dislocation-starvation
#13
Peng Huang, Qian Yu
"Smaller is stronger" has been commonly observed in cubic structured and hexagonal close-packed (HCP) structured materials. Dislocation starvation phenomenon is highly responsible for the increase of strength at smaller scale in cubic materials. However, by using quantitative in situ transmission electron microscope (TEM) nano-mechanical testing on cylindrical titanium nano-pillars with diameters of ~150 nm but varied orientations and three dimensional dislocation tomography, we found that dislocation nucleation and multiplication dominate the plastic deformation of the nano-pillars with no sign of dislocation starvation, resulting in much better ability of dislocation storage and plastic stability of HCP structured materials at extremely small scale...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29130682/high-performance-piezoelectric-nanogenerators-via-imprinted-sol-gel-batio3-nanopillar-array
#14
Sung-Ho Shin, Seong-Young Choi, Min Hyung Lee, Junghyo Nah
We report high performance piezoelectric nanogenerators (PENGs) with nanoimprinted sol-gel BaTiO3 (BTO) nanopillar array polarized under high electric field and ultraviolet. The PENGs fabricated using this method demonstrate greatly enhanced output voltage of ~10 V and current density of ~1.2 μA cm-2, respectively, in comparison to that of flat PENG. Further, the PENG demonstrates uniform output characteristics over the entire device area thanks to uniform nanoimprint pillar array. The approach introduced here is simple, effective, reliable, and reproducible way to fabricate high performance sol-gel based PENGs and electronic devices...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29106432/ultra-sensitive-near-infrared-graphene-photodetectors-with-nanopillar-antennas
#15
Yu Liu, Wen Huang, Tianxun Gong, Yue Su, Hua Zhang, Yiwen He, Zhiwei Liu, Bin Yu
Graphene has been demonstrated as a candidate for optoelectronic devices due to its broad absorption spectrum and ultra-high carrier mobility. However, graphene is essentially transparent in visible and near-infrared regimes with an absorptivity of 2.3%, which largely limits its application in photodetection. Here, we show that metallic nanopillar antennas could improve light absorption in graphene detectors. The coupled antennas help to concentrate a free space electromagnetic wave around the nanopillars by localized surface plasmon resonance, strongly impacted by geometrical design...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29082999/nanofabrication-of-mechano-bactericidal-surfaces
#16
REVIEW
Denver P Linklater, Saulius Juodkazis, Elena P Ivanova
The search for alternatives to the standard methods of preventing bacterial adhesion and biofilm formation on biotic and abiotic surfaces alike has led to the use of biomimetics to reinvent through nanofabrication methods, surfaces, whereby the nanostructured topography is directly responsible for bacterial inactivation through physico-mechanical means. Plant leaves, insect wings, and animal skin have been used to inspire the fabrication of synthetic high-aspect-ratio nanopillared surfaces, which can resist bacterial colonisation...
November 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/29077124/far-field-and-near-field-monitoring-of-hybridized-optical-modes-from-au-nanoprisms-suspended-on-a-graphene-si-nanopillar-array
#17
Li-Wei Nien, Kai Chen, Thang Duy Dao, Satoshi Ishii, Chun-Hway Hsueh, Tadaaki Nagao
The optical hybridization of localized surface plasmons and photonic modes of dielectric nanostructures provides us wide arenas of opportunities for designing tunable nanophotonics with excellent spectral selectivity, signal enhancement, and light harvesting for many optical applications. Graphene-supported Au nanoprisms on a periodic Si nanopillar array will be an ideal model system for examining such an optical hybridization effect between plasmonic modes and photonic modes. Here, through the measurement of the reflectance spectra as well as graphene phonons by surface-enhanced Raman scattering (SERS), we investigated both the far-field and near-field properties of these optically hybridized modes...
November 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/29048904/ultra-high-elastic-strain-energy-storage-in-metal-oxide-infiltrated-patterned-hybrid-polymer-nanocomposites
#18
Keith Dusoe, Xinyi Ye, Kim Kisslinger, Aaron Stein, Seok-Woo Lee, Chang-Yong Nam
Modulus of resilience, the measure of a material's ability to store and release elastic strain energy, is critical for realizing advanced mechanical actuation technologies in micro/nanoelectromechanical systems. In general, engineering the modulus of resilience is difficult because it requires asymmetrically increasing yield strength and Young's modulus against their mutual scaling behavior. This task becomes further challenging if it needs to be carried out at the nanometer scale. Here, we demonstrate organic-inorganic hybrid composite nanopillars with one of the highest modulus of resilience per density, by utilizing vapor-phase aluminum oxide infiltration in lithographically patterned negative photoresist SU-8...
October 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/29037896/manipulation-of-the-response-of-human-endothelial-colony-forming-cells-by-focal-adhesion-assembly-using-gradient-nanopattern-plates
#19
Long-Hui Cui, Hyung Joon Joo, Dae Hwan Kim, Ha-Rim Seo, Jung Suk Kim, Seung-Cheol Choi, Li-Hua Huang, Ji Eun Na, I-Rang Lim, Jong-Ho Kim, Im Joo Rhyu, Soon Jun Hong, Kyu Back Lee, Do-Sun Lim
Nanotopography plays a pivotal role in the regulation of cellular responses. Nonetheless, little is known about how the gradient size of nanostructural stimuli alters the responses of endothelial progenitor cells without chemical factors. Herein, the fabrication of gradient nanopattern plates intended to mimic microenvironment nanotopography is described. The gradient nanopattern plates consist of nanopillars of increasing diameter ranges [120-200 nm (GP 120/200), 200-280 nm (GP 200/280), and 280-360 nm (GP 280/360)] that were used to screen the responses of human endothelial colony-forming cells (hECFCs)...
October 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29023374/periodic-tio%C3%A2-nanostructures-with-improved-aspect-and-line-space-ratio-realized-by-colloidal-photolithography-technique
#20
Loïc Berthod, Olga Shavdina, Isabelle Verrier, Thomas Kämpfe, Olivier Dellea, Francis Vocanson, Maxime Bichotte, Damien Jamon, Yves Jourlin
This paper presents substantial improvements of the colloidal photolithography technique (also called microsphere lithography) with the goal of better controlling the geometry of the fabricated nano-scale structures-in this case, hexagonally arranged nanopillars-printed in a layer of directly photopatternable sol-gel TiO₂. Firstly, to increase the achievable structure height the photosensitive layer underneath the microspheres is deposited on a reflective layer instead of the usual transparent substrate. Secondly, an increased width of the pillars is achieved by tilting the incident wave and using multiple exposures or substrate rotation, additionally allowing to better control the shape of the pillar's cross section...
October 12, 2017: Nanomaterials
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