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Shanshan Zhang, Qingfen Niu, Tao Sun, Yang Li, Tianduo Li, Haixia Liu
A novel linear A-π-D-π-A-type organic small molecule Ph2(PDPP)2 consisting diketopyrrolopyrrole (DPP) as acceptor unit, biphenylene as donor unit and acetylene unit as π-linkage has been successfully designed and synthesized. Its corresponding thermal, photophysical and electrochemical properties as well as the photoinduced charge-separation process were investigated. Ph2(PDPP)2 exhibits high thermal stability and it can be soluble in common organic solvents such as chloroform and tetrahydrofuran. The photophysical properties show that DPP2Ph2 harvests sunlight over the entire visible spectrum range in the thin-film state (300-800nm)...
April 20, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Sándor Góbi, Alexandre Bergantini, Andrew M Turner, Ralf I Kaiser
Thin films of ammonium perchlorate (NH4ClO4) were exposed to energetic electrons at 5.5 K to explore the radiolytic decomposition mechanisms. The effects of radiolysis were monitored on line and in situ via Fourier-transform infrared spectroscopy (FTIR) in the condensed phase along with electron impact ionization quadrupole mass spectrometry (EI-QMS) and single-photon photoionization reflectron time-of-flight mass spectrometry (PI-ReTOF-MS) during the temperature programmed desorption (TPD) phase to probe the subliming molecules...
April 26, 2017: Journal of Physical Chemistry. A
Jiang Wu, Junyan Chen, Yifei Zhang, Zhaojian Xu, Lichen Zhao, Tanghao Liu, Deying Luo, Wenqiang Yang, Ke Chen, Qin Hu, Fengjun Ye, Pan Wu, Rui Zhu, Qihuang Gong
In many optoelectronic applications, patterning is required for functional and/or aesthetic purposes. However, established photolithographic technique can't be applied directly to the hybrid perovskites, which are considered as promising candidates for optoelectronic applications. In this work, a wettability-assisted photolithography (WAP) process, which employs photolithography and one-step solution process to deposit hybrid perovskite, was developed for fabricating patterned hybrid perovskite films. Uniform pinhole-free hybrid perovskite films with sharp-edged micro-patterns of any shapes can be constructed through the WAP process...
April 26, 2017: Nano Letters
Xiaohu Luo, Song Yuan, Xinyu Pan, Caixia Zhang, Shuo Du, Yali Liu
Effective prevention of the water, oxygen, and chloride ions held in the hydrotalcite interlayer from diffusing through the layered double hydroxides ( LDH ) layer is crucial importance for its further practical application in the corrosion protection. In this study, a hybrid reduced graphene oxide ( RGO ) nanosheet /Zn2+/Al3+ layered double hydroxides ( RGO/ZnAl-LDH ) composite film with an excellent corrosion protection property on the 6N01 aluminum alloy surface was synthesized by a newly and facile hydrothermal continuous flow method,which can enable direct growth on the substrate...
April 26, 2017: ACS Applied Materials & Interfaces
Abshar Hasan, Gyan Waibhaw, Sakshi Tiwari, K Dharmalingam, I Shukla, Lalit M Pandey
This study describes the preparation of composite film using chitosan (CS) and polyvinylpyrrolidone (PVP) with incorporated cellulose nanowhiskers (CNWs) for drug delivery application. CNWs were prepared by acid hydrolysis of cellulose with sulfuric acid. Field emission scanning electron microscopy studies revealed nanofibrous morphology of CNWs with 20-30 nm diameter and 200-250 nm in length. X-ray powder diffraction (XRD) analysis confirmed highly crystalline nature of CNWs with 92.81% crystallinity. Incorporation of CNWs enhanced the thermal and mechanical properties of films...
April 26, 2017: Journal of Biomedical Materials Research. Part A
Amita Ummadisingu, Ludmilla Steier, Ji-Youn Seo, Taisuke Matsui, Antonio Abate, Wolfgang Tress, Michael Grätzel
Optimizing the morphology of metal halide perovskite films is an important way to improve the performance of solar cells when these materials are used as light harvesters, because film homogeneity is correlated with photovoltaic performance. Many device architectures and processing techniques have been explored with the aim of achieving high-performance devices, including single-step deposition, sequential deposition and anti-solvent methods. Earlier studies have looked at the influence of reaction conditions on film quality, such as the concentration of the reactants and the reaction temperature...
April 26, 2017: Nature
Yujuan He, Ki-Joong Kim, Chih-Hung Alex Chang
Hollow silica nanoparticles (HSNPs) were synthesized using a microreactor-assisted system with a hydrodynamic focusing micromixer (HFM). Due to the fast mixing of each precursor in the system, the PAA thermodynamic-locked (TML) conformations were protected from their random aggregations by the immediately initiated growth of silica shells. When altering the mixing time through varying flow rates and flow rate ratios, the different degrees of the aggregation of PAA TML conformations were observed. The globular and necklace-like TML conformations were successfully captured by modifying the PAA concentration at the optimized mixing condition...
April 26, 2017: Nanotechnology
Zhongchen Bai, Licai Hao, Zhengping Zhang, Zhaoling Huang, Shuijie Qin
We present the enhanced photoluminescence (PL) of a corrugated Al2O3 film enabled by colloidal CdSe quantum dots. The colloidal CdSe quantum dots are fabricated directly on a corrugated Al2O3 substrate using an electrochemical deposition (ECD) method in a microfluidic system. The photoluminescence is excited by using a 150 nm diameter ultraviolet laser spot of a scanning near-field optical microscope. Owing to the electron transfer from the conduction band of the CdSe quantum dots to that of Al2O3, the enhanced photoluminescence effect is observed, which results from the increase in the recombination rate of electrons and holes on the Al2O3 surface and the reduction in the fluorescence of the CdSe quantum dots...
May 19, 2017: Nanotechnology
Min Seok Koo, Kangwoo Cho, Jeyong Yoon, Wonyong Choi
Vertically aligned TiO2 nanotube arrays (TNTs) were prepared by electrochemical anodization, and then cathodically polarized with dark blue coloration for the dual-functional photoelectrochemical water treatment of organic substrates degradation and accompanying H2 generation. The resulting Blue-TNTs (inner diameter: ~40 nm; length: ~9 μm) showed negligible shift in X-ray diffraction pattern compared with the intact TNTs, but the X-ray photoelectron spectra indicated a partial reduction of Ti(4+) to Ti(3+) on the surface...
April 26, 2017: Environmental Science & Technology
Yo-Han Kim, Eun Yeol Lee, Hyun Ho Lee, Tae Seok Seo
Reduced graphene oxide quantum dot (rGOQD) devices in formats of capacitor and thin film transistor (TFT) were demonstrated and examined as the first trial to achieve non-ambipolar channel property. In addition, through gold nanoparticles (Au NPs) layer embedded between the rGOQD active channel and dielectric layer, memory capacitor and TFT performances were realized by capacitance-voltage (C-V) hysteresis and gate program, erase, and reprogram biases. First, capacitor structure of the rGOQD memory device was constructed to examine memory charging effect featured in hysteretic C-V behavior with a 30 nm dielectric layer of crosslinked polyvinyl alcohol (PVA)...
April 26, 2017: ACS Applied Materials & Interfaces
Nifang Zhao, Miao Yang, Qian Zhao, Weiwei Gao, Tao Xie, Hao Bai
Through designing hierarchical structures, particularly optimizing the chemical and architectural interactions at its inorganic/organic interface, nacre has achieved an excellent combination of contradictory mechanical properties such as strength and toughness, which is highly demanded yet difficult to achieve by most synthetic materials. Most techniques applied to develop nacre-mimetic composites have been focused on mimicking the 'brick-and-mortar' structure, but the interfacial architectural features, especially the asperities and mineral bridges of 'bricks', have been rarely concerned, which are of equal importance for enhancing mechanical properties of nacre...
April 26, 2017: ACS Nano
Michał Wójcik, Jaroslaw Wrobel, Zuzanna Janczuk, Jozef Mieczkowski, Ewa Gorecka, Joonmyung Choi, Maenghyo Cho, Damian Pociecha
Embedding nanoparticles in a responsive polymer matrix is a formidable way to fabricate hybrid materials with predesigned properties and prospective applications in actuators, mechanically tunable optical elements or electroclinic films. However, achieving chemical compatibility between nanoparticles and organic matter is not trivial and often results in disordered structures. Herein we show that using nanoparticles as exclusive cross-linkers in the preparation of liquid-crystalline polymers can yield long-range ordered liquid-crystalline elastomers with high loading of well dispersed nanoparticles, as confirmed with small angle XRD measurements...
April 26, 2017: Chemistry: a European Journal
Seongpil An, Yong Il Kim, Sumit Sinha-Ray, Min-Woo Kim, Hong Seok Jo, Mark T Swihart, Alexander L Yarin, Sam S Yoon
Mechanically robust freestanding platinum (Pt) nanofiber (NF) meshes are of great interest in applications where the corrosion resistance, malleability, and stability of a pure platinum structure must be combined with high surface area for catalysis. For photoelectrochemical applications, transparent electrodes are desirable. Several 1-dimensional (1D) Pt-based materials have been developed, but energy-intensive fabrication techniques and unsatisfactory performance have limited their practical implementation in next-generation photoelectrochemical applications...
April 26, 2017: Nanoscale
Filiberto Ricciardella, Sten Vollebregt, Tiziana Polichetti, Mario Miscuglio, Brigida Alfano, Maria L Miglietta, Ettore Massera, Girolamo Di Francia, Pasqualina M Sarro
The crystal structure of graphene flakes is expected to significantly affect their sensing properties. Here we report an experimental investigation on the crystalline structure of graphene aimed at exploring the effects on the gas sensing properties. The morphology of graphene, prepared via Chemical Vapor Deposition (CVD), Liquid Phase Exfoliation (LPE) and Mechanical Exfoliation (ME), is inspected through Raman spectroscopy, Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). CVD and LPE-graphene structures are found to be more defective with respect to ME-graphene...
April 26, 2017: Nanoscale
G K Dolan, G E Yakubov, M R Bonilla, P Lopez-Sanchez, J R Stokes
The tribology between biphasic materials is challenging to predict and interpret due to the interrelationship between mechanical properties, microstructure and movement of the fluid phase contained within. A new approach is presented to deconvolute these effects for cellulose hydrogels, which have a fibrous network that is akin to the microstructure of articular cartilage and plant cell walls. This is achieved by developing a tribo-rheological technique that uniquely incorporates in situ mechanical characterisation (compression-relaxation and small amplitude oscillatory shear) immediately prior to measuring the tribological response between pairs of hydrogels...
April 26, 2017: Soft Matter
Elise F D Sabattié, Jos Tasche, Mark R Wilson, Maximilian W A Skoda, Arwel Hughes, Torsten Lindner, Richard L Thompson
Compatibility between oligomers and polymers was systematically assessed using differential scanning calorimetry (DSC) and was correlated with similarity in saturation and solubility parameter. These measurements enabled validation of detailed volume of mixing calculations using Statistical Association Fluid Theory (SAFT-γ Mie) and molecular dynamics (MD) simulations, which can be used to predict behaviour beyond the experimentally accessible conditions. These simulations confirmed that squalane is somewhat more compatible with poly(isoprene), "PI" than poly(butadiene), "PB", and further enabled prediction of the temperature dependence of compatibility...
April 26, 2017: Soft Matter
Ying-Rui Lu, Tzung-Zing Wu, Han-Wei Chang, Jeng-Lung Chen, Chi-Liang Chen, Da-Hau Wei, Jin-Ming Chen, Wu-Ching Chou, Chung-Li Dong
Smart windows, which change color in response to external stimuli, are extensively studied owing to their potential technological applications in sensors and their ability to reduce the energy consumed by buildings. Most related studies focus on the optical properties of smart color switching films that can control the transmission of light and that of heat independently. This study examines the vanadium pentoxide thin film as a model system of a color switchable window. A gasochromic thin film of V2O5 is fabricated using sol-gel spin coating...
April 26, 2017: Physical Chemistry Chemical Physics: PCCP
Carlos Echaide-Górriz, Marta Navarro, Carlos Téllez, Joaquín Coronas
The MOFs Cr carboxylate MIL-101(Cr) and Zn imidazolate ZIF-11 have different chemical and textural properties. These properties have been combined to prepare thin film nanocomposite (TFN) membranes for organic solvent nanofiltration (OSN) with the two MOFs simultaneously embedded in the same membrane. The TFN membrane containing only ZIF-11 permeated faster than that with only MIL-101(Cr) when filtering sunset yellow (SY) (4.9 L m(-2) h(-1) bar(-1)) and acridine orange (AO) (3.2 L m(-2) h(-1) bar(-1)), although MIL-101(Cr) alone gave rise in both cases to better rejections (above 90%)...
April 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Da-Hai Li, Hua Zheng, Zi-Yi Wang, Rong-Jun Zhang, Hao Zhang, Yu-Xiang Zheng, Song-You Wang, David Wei Zhang, Liang-Yao Chen
Centimeter-scale WS2 ultrathin films were synthesized on sapphire substrates, and they showed highly oriented crystallographic growth along the c axis. Afterwards, the as-grown samples were systematically characterized using various detection methods. Reliable values of the roughness layer thickness and the film thickness were extracted using both atomic force microscopy (AFM) and spectroscopic ellipsometry (SE), and identified using Raman spectroscopy as well. The expansion and tensile strain along the [001] direction were discovered using X-ray diffraction (XRD) measurements...
April 26, 2017: Physical Chemistry Chemical Physics: PCCP
Sung-Soo Kim, Donghwi Kang, Byeong-Hyeok Sohn
We report the synthesis of arrayed nanorings with tunable physical dimensions from thin films of polystyrene-<i>block</i>-poly(4-vinylpyridine) (PS-P4VP) micelles. For accurate control of the inner and outer diameters of the nanorings, we added imidazolium-based ionic liquids (ILs) into the micellar solution, which were eventually incorporated into the micellar cores. We observed the structural changes of the micellar cores coated on a substrate due to the presence of ILs. The spin-coated micellar cores were treated with an acidic precursor solution and generated toroid nanostructures, of which size depended on the amount of IL loaded into the micelles...
April 26, 2017: Nanotechnology
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