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Layer V

Anh-Vy Tran, KyuHwan Shim, Thu-Thao Vo Thi, Jeong-Keun Kook, Seong Soo A An, Sang-Wha Lee
This study demonstrated the targeted delivery and controlled release of cisplatin drug molecules from doubly decorated mesoporous silica nanoparticles (MSNs), which were internally grafted with fluorescent conjugates and externally coated with polydopamine (PDA) and graphene oxide (GO) layers. The brush-like internal conjugates conferred fluorescent functionality and high capacity of cisplatin loading into MSNs, as well as contributing to a sustained release of the cisplatin through a porous channel with the assistance of external PDA layer...
May 15, 2018: Acta Biomaterialia
Debkalpa Goswami, Juan Camilo Múnera, Aniket Pal, Behnam Sadri, Caio Lui Paganelli Guzzo Scarpetti, Ramses V Martinez
This letter describes a low-cost, scalable nanomanufacturing process that enables the continuous forming of thin metallic layers with nanoscale accuracy using roll-to-roll, laser-induced superplasticity (R2RLIS). R2RLIS uses a laser shock to induce the ultrahigh strain rate deformation of metallic films at room temperature into low-cost polymeric nanomolds, independently of the original grain size of the metal. This simple and inexpensive nanoforming method does not require access to cleanrooms and associated facilities, and can be easily implemented on conventional CO2 lasers, enabling laser systems commonly used for rapid prototyping or industrial cutting and engraving to fabricate uniform and three-dimensional crystalline metallic nanostructures over large areas...
May 18, 2018: Nano Letters
Zongmin Zheng, Lele Lin, Shiguang Mo, Daohui Ou, Jing Tao, Ruixuan Qin, Xiaoliang Fang, Nanfeng Zheng
2D layered metal hydroxides (LMH) are promising materials for electrochemical energy conversion and storage. Compared with exfoliation of bulk layered materials, wet chemistry synthesis of 2D LMH materials under mild conditions still remains a big challenge. Here, an "MgO-mediated strategy" for mass production of various 2D LMH nanosheets is presented by hydrolyzing MgO in metal salt aqueous solutions at room temperature. Benefiting from this economical and scalable strategy, ultrathin LMH nanosheets (M = Ni, Fe, Co, NiFe, and NiCo) and their derivatives (e...
May 17, 2018: Small
Igor Y Iskusnykh, Randal K Buddington, Victor V Chizhikov
Preterm birth is a leading cause of long-term motor and cognitive deficits. Clinical studies suggest that some of these deficits result from disruption of cerebellar development, but the mechanisms that mediate cerebellar abnormalities in preterm infants are largely unknown. Furthermore, it remains unclear whether preterm birth and precocious exposure to the ex-utero environment directly disrupt cerebellar development or indirectly by increasing the probability of cerebellar injury, including that resulting from clinical interventions and protocols associated with the care of preterm infants...
May 14, 2018: Experimental Neurology
Peiyun Yi, Weixin Zhang, Feifei Bi, Linfa Peng, Xinmin Lai
Proton exchange membrane fuel cells (PEMFCs) are renewable and clean energy conversion device, of which the metallic bipolar plates are one of the key components. However, high interfacial contact resistance and poor corrosion resistance are still great challenges for the commercialization of metallic bipolar plates. In this study, we demonstrated a novel strategy for depositing TiCx /a-C nanolayered coatings by synergy of 60 V and 300 V bias voltage to enhance corrosion resistance and interfacial conductivity...
May 17, 2018: ACS Applied Materials & Interfaces
Seiichiro Izawa, Naoto Shintaku, Masahiro Hiramoto
Open-circuit voltage ( VOC ) is a key parameter governing the power conversion efficiency of organic solar cells. We clarified the effect of band bending in organic semiconductor films on the VOC of phthalocyanine (H2 Pc)/fullerene (C60 ) planar heterojunction (PHJ) OSCs. The VOC was significantly affected by the H2 Pc layer thickness, varying from 0.20 V at 2 nm to 0.49 V at 100 nm thickness. The large VOC change is due to the band bending in the H2 Pc layer, where the difference in H2 Pc layer thickness led to significant changes in the degree of the vacuum-level shift in the C60 layer because of the Fermi level ( EF ) difference between the H2 Pc and C60 layers...
May 18, 2018: Journal of Physical Chemistry Letters
Alexey V Ermakov, Olga A Inozemtseva, Dmitry A Gorin, Gleb B Sukhorukov, Sergei Belyakov, Maria N Antipina
Layer-by-layer assembled polymeric multilayer capsules (PMC) of micrometer sizes are permeable for molecules below 1 KDa; therefore, the efficacy of such capsules in the delivery of low molecular weight water soluble bioactive compounds and drugs is frequently challenged. Thermally induced contraction of hollow PMC is explored here to enhance their loading efficacy with model compound, fluorescent rhodamine B (RhB). Four bilayered capsules obtained of poly(diallyldimethylammonium chloride)/polystyrene sulfonate ([PDADMAC/PSS]4 ) or poly-l-arginine/dextran sulfate ([PARG/DS]4 ) on sacrificial CaCO3 spherical microparticles are postloaded with RhB at ambient or elevated temperatures...
May 16, 2018: Macromolecular Rapid Communications
Diana Mesquita Fernandes, Hugo C Novais, Revathi R Bacsa, Philippe Serp, Belén Bachiller-Baeza, Inmaculada Rodriguez-Ramos, Antonio Guerrero-Ruiz, Cristina Freire
The oxygen reduction reaction (ORR) has a crucial function as the cathode reaction in energy-converting systems, such as fuel cells (FCs), which contributes to a sustainable energy supply. However, the current use of precious Pt-based electrocatalysts (ECs) is a major drawback for the economic viability of fuel cells. Hence, it is urgent to develop cost-effective and efficient electrocatalysts (ECs) without noble metals to substitute the Pt-based ECs. Herein, we report the preparation and application as ORR electrocatalysts of four new nanocomposites based on sandwich-type phosphotungstate [(TBA)7H3[Co4(H2O)2(PW9O34)2] (TBA-Co4(PW9)2) immobilized onto different carbon nanomaterials (single-walled carbon nanotubes (SWCNT), graphene flakes (GF), carbon nanotubes doped with nitrogen (N-CNT) and nitrogen-doped few layer graphene (N-FLG))...
May 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Zhaomeng Wang, Ying Wang, Rui Ge Wu, Z P Wang, R V Ramanujan
Label-free manipulation of biological entities can minimize damage, increase viability and improve efficiency of subsequent analysis. Understanding the mechanism of interaction between magnetic and nonmagnetic particles in an inverse ferrofluid can provide a mechanism of label-free manipulation of such entities in a uniform magnetic field. The magnetic force, induced by relative magnetic susceptibility difference between nonmagnetic particles and surrounding magnetic particles as well as particle-particle interaction were studied...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Sarvottam K Jha, Reetu Kumari, Shubham Choudhary, Puspendu Guha, P V Satyam, Brajesh S Yadav, Zainab Naqvi, S S Kushvaha, R K Ratnesh, M S Mehata, Aditya Jain, Amrish K Panwar, Fouran Singh, Pawan K Tyagi
In this paper, we have reported a simple and efficient method for the synthesis of uniform, highly conducting single or few layer molybdenum disulfide (MoS2) on large scale. Scanning Electron Microscopy (SEM) and High Resolution Transmission Electron Microscopy (HRTEM) have been used for the confirmation of mono or few layered nature of the as-synthesized MoS2 sheets. X-ray Photoelectron Spectroscopy (XPS), X-Ray Diffraction (XRD) and Raman Spectroscopy have also been used to study the elemental, phase, and molecular composition of the sample...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Jiayue Tong, Matthew C Conte, Thomas Goldstein, K Sigfrid Yngvesson, Joseph C Bardin, Jun Yan
Graphene, a single atomic layer of covalently bonded carbon atoms, has been investigated intensively for optoelectronics and represents a promising candidate for high-speed electronics. Here we present a microwave mixer constructed as an asymmetrically-contacted two-terminal graphene device based on the thermoelectric effect. We report a 50 GHz (minimum) mixer bandwidth as well as 130 V/W extrinsic direct-detection responsivity. Anomalous second-harmonic generation due to self-mixing in our graphene detector is also observed...
May 16, 2018: Nano Letters
Yibo Zhu, Yijun Li, Ghidewon Arefe, Robert A Burke, Cheng Tan, Yufeng Hao, Xiaochi Liu, Xue Liu, Won Jong Yoo, Madan Dubey, Qiao Lin, James C Hone
Two-dimensional transition metal dichalcogenides (TMDs) are unique candidates for development of next-generation electronic devices. However, the large contact resistance between metal and the monolayer TMDs have significantly limited the devices' performance. Also, integration of ultrathin high-k dielectric layer with TMD remains difficult due to the lack of dangling bonds on the surface of TMDs. We present monolayer molybdenum disulfide field effect transistors with bottom local gates consisting of monolayer graphene...
May 16, 2018: Nano Letters
Christian Dahl-Petersen, Manuel Sarić, Michael Brorson, Poul Georg Moses, Jan Rossmeisl, Jeppe V Lauritsen, Stig Helveg
Layered transition metal dichalcogenides have distinct physicochemical properties at their edge-terminations. The production of an abundant density of edge structures is, however, impeded by the excess surface energy of edges compared to basal planes and would benefit from insight into the atomic growth mechanisms. Here, we show that edge-terminated MoS2 nanostructures can form during sulfidation of MoO2 nanocrystals by using in situ transmission electron microscopy (TEM). Time-resolved TEM image series reveal that the MoO2 surface can sulfide by inward progression of MoO2 (20-2):MoS2 (002) interfaces resulting in upright-oriented and edge-exposing MoS2 sheets...
May 16, 2018: ACS Nano
Mujeeb Ullah Chaudhry, Kornelius Tetzner, Yen-Hung Lin, Sungho Nam, Christopher Pearson, Chris Groves, Michael C Petty, Thomas D Anthopoulos, Donal D C Bradley
We report the development of low operating voltages in inorganic-organic hybrid light-emitting transistors (HLETs) based on solution-processed ZrOx gate dielectric and a hybrid multilayer channel consisting of the heterojunction In3 O2 /ZnO and the organic polymer 'Super Yellow' acting as n- and p-channel/emissive layers, respectively. Resulting HLETs operate at the lowest voltages reported to-date (<10 V) and combine high electron mobility (22 cm2 /Vs) with appreciable current on/off ratios (≈103 ) and an external quantum efficiency of 2×10-2 % at 700 cd/m2 ...
May 16, 2018: ACS Applied Materials & Interfaces
Sangik Lee, Chansoo Yoon, Ji Hye Lee, Yeon Soo Kim, Mi Jung Lee, Wondong Kim, Jaeyoon Baik, Quanxi Jia, Bae Ho Park
Two-dimensional (2D) layered semiconducting materials with considerable bandgaps are emerging as a new class of materials applicable to next-generation devices. Particularly, black phosphorus (BP) is considered to be very promising for next-generation 2D electrical and optical devices due to its high carrier mobility of 200-1000 cm2 V-1 s-1 and large on/off ratio of 104 -105 in field effect transistors. However, its environmental instability in air requires fabrication processes in a glove box filled with nitrogen or argon gas followed by encapsulation, passivation, and chemical functionalization of BP...
May 16, 2018: ACS Applied Materials & Interfaces
Guozhen Zhu, Qing Li, Renchao Che
TiNb2O7 with high charge/discharge voltage (1.65 V), long life span and excellent reversibility has become a new anode material for lithium ion batteries in recent years. However, the inherent poor electronic conductivity strictly limits its practical applications. Herein, we first report a hollow TiNb2O7@C spheres with carbon spheres as sacrificial template. The special hollow structure can effectively relieve the volume expansion during the repeated process of charging/discharging. The conductivity of hollow TiNb2O7 spheres can be greatly improved by the carbon layers uniformly coated outside the surface of TiNb2O7 spheres...
May 15, 2018: Chemistry: a European Journal
Sri Kasi Matta, Chunmei Zhang, Yalong Jiao, Anthony O'Mullane, Aijun Du
The properties of bulk compounds required to be suitable for photovoltaic applications, such as excellent visible light absorption, favorable exciton formation, and charge separation are equally essential for two-dimensional (2D) materials. Here, we systematically study 2D group IV-V compounds such as SiAs2 and GeAs2 with regard to their structural, electronic and optical properties using density functional theory (DFT), hybrid functional and Bethe-Salpeter equation (BSE) approaches. We find that the exfoliation of single-layer SiAs2 and GeAs2 is highly feasible and in principle could be carried out experimentally by mechanical cleavage due to the dynamic stability of the compounds, which is inferred by analyzing their vibrational normal mode...
2018: Beilstein Journal of Nanotechnology
Hemant P Yennawar, Heather G Bradley, Kristen C Perhonitch, Haley E Reppert, Lee J Silverberg
The crystal structures of isomeric rac -2-(4-nitro-phen-yl)-3-phenyl-2,3,5,6-tetra-hydro-4 H -1,3-thia-zin-4-one (C16 H14 N2 O3 S) ( 1 ) and (2 S )-2-(3-nitro-phen-yl)-3-phenyl-2,3,5,6-tetra-hydro-4 H -1,3-thia-zin-4-one (C16 H14 N2 O3 S) ( 2 ) are reported here. While 1 crystallizes in a centrosymmetric space group, the crystal of 2 chosen for data collection has mol-ecules only with (2 S ) chirality. This is the result of spontaneous resolution during crystallization, as the synthesis produces a racemic mixture...
April 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Hemant P Yennawar, Michaela J Buchwalter, Baylee K Colburn, Lee J Silverberg
The syntheses and crystal structures of 2,3-bis-[3-(tri-fluoro-meth-yl)phen-yl]-2,3-di-hydro-4 H -1,3-benzo-thia-zin-4-one (di- m -CF3 ; C22 H13 F6 NOS) ( 1 ) and 2,3-bis-(4-methyl-phen-yl)-2,3-di-hydro-4 H -1,3-benzo-thia-zin-4-one (di- p -CH3 ; C22 H19 NOS) ( 2 ) are reported. Each structure is racemic: the asymmetric unit of 2 consists of two mol-ecules. In both 1 and 2 , the six-membered 1,3-thia-zine ring is close to an envelope conformation with the chiral C atom forming the flap. In 1 , the 2-aryl group is pseudo-equatorial, while in 2 it is pseudo-axial...
March 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Yonggang Wang, Jianjun Ying, Zhengyang Zhou, Junliang Sun, Ting Wen, Yannan Zhou, Nana Li, Qian Zhang, Fei Han, Yuming Xiao, Paul Chow, Wenge Yang, Viktor V Struzhkin, Yusheng Zhao, Ho-Kwang Mao
The discovery of iron-based superconductors (FeSCs), with the highest transition temperature (Tc ) up to 55 K, has attracted worldwide research efforts over the past ten years. So far, all these FeSCs structurally adopt FeSe-type layers with a square iron lattice and superconductivity can be generated by either chemical doping or external pressure. Herein, we report the observation of superconductivity in an iron-based honeycomb lattice via pressure-driven spin-crossover. Under compression, the layered FePX3 (X = S, Se) simultaneously undergo large in-plane lattice collapses, abrupt spin-crossovers, and insulator-metal transitions...
May 15, 2018: Nature Communications
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