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Thin film

Yanxia Li, Chaoyang Jiang
Molecular imprinting is an efficient technology to create artificial receptors with antibody-like binding properties for a variety of applications such as separation and sensing. In this work, a new sensing method was introduced by combining a two-dimensional molecularly imprinted polymer (2D-MIP) film with copper oxide nanoparticles (CuO NPs) labeling for signal conversion and amplification. CuO labeling can effectively monitor the thickness of 2D-MIPs to achieve the best imprinting effect. Trypsin imprinted polymer based electrochemical sensor on 96-well microplates was constructed and a good dynamic response was observed in the range of 0...
July 31, 2018: Biosensors & Bioelectronics
Biji T Kurien, R Hal Scofield
It is customary to dry gels (SDS-PAGE, native gels, or two-dimensional gels) after staining for record keeping purposes. This is typically carried out with gel dryers or by drying between two cellophane sheets held together by acrylic frames. Here, we report a simple method to store a variety of stained gels without any storage buffer within flexible nonsealed polyethylene bags. Gels can be stored for several months at room temperature without significant shrinking or protein diffusion. The gel stays hydrated owing to the de facto sealing achieved by the polyethylene sheets adhering air-tightly to the gel on either side...
2018: Methods in Molecular Biology
Yuwei Wang, Hong Liu, Wenzhong Shen
Hydrogenated nanocrystalline silicon (nc-Si:H) thin film has received a great deal of attention as a promising material for flat panel display transistors, solar cells, etc. However, the multiphase structure of nc-Si:H leads to many defects. One of the major challenges is how to reduce the defects conveniently. In this work, we developed a simple and effective method to deposit low-defect-density nc-Si:H thin film. This method is simply by tuning the deposition pressure in a high-pressure range in plasma-enhanced chemical vapor deposition (PECVD) process...
August 10, 2018: Nanoscale Research Letters
Bradley S Gundlach, Michel Frising, Alireza Shahsafi, Gregory Vershbow, Chenghao Wan, Jad Salman, Bas Rokers, Laurent Lessard, Mikhail A Kats
To see color, the human visual system combines the response of three types of cone cells in the retina-a compressive process that discards a significant amount of spectral information. Here, we present designs based on thin-film optical filters with the goal of enhancing human color vision by breaking its inherent binocular redundancy, providing different spectral content to each eye. We fabricated a set of optical filters that "splits" the response of the short-wavelength cone between the two eyes in individuals with typical trichromatic vision, simulating the presence of approximately four distinct cone types...
August 10, 2018: Scientific Reports
Shusaku Nagano
Rod-like liquid-crystalline (LC) mesogens preferentially adopt a homeotropic orientation by excluded volume effects at the free surface in side-chain LC (SCLC) polymer films. The homeotropic orientation is not advantageous for in-plane LC alignment processes. Surface segregation of polymers is the phenomenon in which one component with a low surface free energy covers the surface in a two or more polymer mixture or block copolymer film. In SCLC block copolymer films, the surface segregation structure induces a random planar orientation due to the formation of a microphase-separated interface parallel to the substrate via the covering of one of the segregated polymer block...
August 10, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Cristina Lorente, Laura Cabeza, Beatriz Clares, Raúl Ortiz, Lyda Halbaut, Ángel V Delgado, Gloria Perazzoli, José Prados, José L Arias, Consolación Melguizo
Magnetoliposomes (MLPs) offer many new possibilities in cancer therapy and diagnosis, including the transport of antitumor drugs, hyperthermia treatment, detection using imaging techniques, and even cell migration. However, high biocompatibility and functionality after cell internalization are essential to their successful application. We synthesized maghemite nanoparticles (γ-Fe2 O3 ) by oxidizing magnetite cores (Fe3 O4 ) and coating them with phosphatidylcholine (PC) liposomes, obtained using the thin film hydration method, to generate MLPs...
July 31, 2018: Colloids and Surfaces. B, Biointerfaces
Hadi Mirahmadi, Azam Shahrakipour, Ahmad Mehravaran, Alireza Salami Khorashad, Mansour Rahmati-Balaghaleh, Mehdi Zarean
BACKGROUND: Malaria is still a major public health problem in subtropical and tropical regions. The rapid and accurate diagnosis of malaria remains a challenge in most of the endemic areas. The primary objective of the present study was to evaluate the performance of multiplex/nested PCR in detecting Plasmodium falciparum at low parasite densities and mixed infection. METHODS: The study was performed in the Sistan-Baluchestan province of the southeastern Iran, from May 2015 to July 2016...
August 7, 2018: Infection, Genetics and Evolution
Joohoon Kang, Spencer A Wells, Vinod K Sangwan, David Lam, Xiaolong Liu, Jan Luxa, Zdeněk Sofer, Mark C Hersam
Layered indium selenide (InSe) presents unique properties for high-performance electronic and optoelectronic device applications. However, efforts to process InSe using traditional liquid phase exfoliation methods based on surfactant-assisted aqueous dispersions or organic solvents with high boiling points compromise electronic properties due to residual surface contamination and chemical degradation. Here, these limitations are overcome by utilizing a surfactant-free, low boiling point, deoxygenated cosolvent system...
August 10, 2018: Advanced Materials
Wenlang Li, Qiuyi Huang, Zhu Mao, Qi Li, Long Jiang, Zongliang Xie, Rui Xu, Zhiyong Yang, Juan Zhao, Tao Yu, Yi Zhang, Matthew P Aldred, Zhenguo Chi
Mechanoluminescence (ML) materials are environmentally friendly and emit light by utilizing mechanical energy, which have been utilized in light source, display, bioimaging and advanced sensors. Organic ML materials have attracted much attention because of convenient synthesis and various ML properties. However, they are strongly limited to application by in-situ unrepeatable ML. Here, a novel strategy of in-situ solar-renewable organic ML materials was shown, by introducing "soft" alkyl chain into an ML unit...
August 9, 2018: Angewandte Chemie
Ryutaro Souda, Takashi Aizawa
Graphite is hydrophobic in nature, but the crystallization kinetics and dewetting transition of thin water films deposited onto graphite are distinct from those on typical hydrophobic substrates. To clarify the origin of these behaviors, we investigated the crystallization kinetics of thin water films on graphite in terms of the initial film thickness, deposition temperature, and template effects of adspecies based on reflection high-energy electron diffraction (RHEED) images; the film morphology change was analyzed using time-of-flight secondary ion mass spectrometry (TOF-SIMS)...
August 10, 2018: Physical Chemistry Chemical Physics: PCCP
Yijia Zhang, Patrick J Shamberger
The design of multifunctional alloys with multiple chemical components requires controllable synthesis approaches. Physical vapor deposition techniques, which result in thin films (<1 μm), have previously been demonstrated for micromechanical devices and metallic combinatorial libraries. However, this approach deviates from bulk-like properties due to the residual stress derived in thin films and is limited by total film thickness. Here, we report a route to obtain ternary Ni-Mn-Sn alloy thick films with controllable compositions and thicknesses by annealing electrochemically deposited multi-layer monatomic (Ni, Mn, Sn) films, deposited sequentially from separate aqueous deposition baths...
August 9, 2018: Scientific Reports
Erica Victoria Barlow, Martin Julian Van Kranendonk
Eighteen microfossil morphotypes from two distinct facies of black chert from a deep-water setting of the c. 2.4 Ga Turee Creek Group, Western Australia, are reported here. A primarily in situ, deep-water benthic community preserved in nodular black chert occurs as a tangled network of a variety of long filamentous microfossils, unicells of one size distribution and fine filamentous rosettes, together with relatively large spherical aggregates of cells interpreted as in-fallen, likely planktonic, forms. Bedded black cherts, in contrast, preserve microfossils primarily within, but also between, rounded clasts of organic material that are coated by thin, convoluted carbonaceous films interpreted as preserved extracellular polymeric substance (EPS)...
August 9, 2018: Geobiology
Fernando G Echeverrigaray, Saron R S de Mello, Leonardo M Leidens, Marcelo E H Maia da Costa, Fernando Alvarez, Thiago A L Burgo, Alexandre F Michels, Carlos A Figueroa
Hydrogenated amorphous carbon (a-C:H) thin films have a unique combination of properties that are fundamental in mechanical and electromechanical devices aimed at energy efficiency issues. The literature brings a wealth of information about the ultra-low friction (superlubricity) mechanism in a-C:H thin films. However, there is persistent controversy concerning the physicochemical mechanisms of contact mechanics at the atomic/molecular level and the role of electrical interactions at the sliding interface is still a matter of debate...
August 9, 2018: Physical Chemistry Chemical Physics: PCCP
Subham Bhattacharjee, Jody A M Lugger, Rint P Sijbesma
Self-supporting polymer thin films were obtained by the polymerization of an AB3-type hydrogen-bonded complex in the plastic columnar phase. Porous polymers with pore diameters of ≈1.1 and ≈1.6 nm lined with either -COOH or -COONa groups were fabricated from the polymer thin films. Both the pore size and pore collapse influence the adsorption of cations.
August 9, 2018: Chemical Communications: Chem Comm
Moin Ahmed, Alireza Zehtab Yazdi, Aly Mitha, Pu Chen
Aqueous lithium energy storage systems (ALESS) offer several advantages over the commercially available non-aqueous systems, most noteworthy higher ionic conductivity, safety and environmentally friendly. The ALESS, however, exhibit faster capacity fading than their non-aqueous counterparts after repeated cycles of charge and discharge; this limits their wide-range applications. Excessive corrosion of metallic anodes in the aqueous electrolyte and accelerated growth of dendrites during the charge/discharge process are found to be the main reasons that severely impact ALESS's lifespan...
August 9, 2018: ACS Applied Materials & Interfaces
Peng Wang, Zhiwei Peng, Muxiao Li, YuHuang Wang
Flexible transparent conductors are an enabling component for large-area flexible displays, wearable electronics, and implantable medical sensors that can wrap around and move with the body. However, conventional conductive materials decay quickly under tensile strain, posing a significant hurdle for functional flexible devices. Here, we show that high electrical conductivity, mechanical stretchability, and optical transparency can be simultaneously attained by compositing long metallic double-walled carbon nanotubes with a polydimethylsiloxane substrate...
August 9, 2018: Small
Sahadev Somasundaram
In response to increased attention in literature, this work provides a qualitative review surrounding the application of silane-based coatings of metallic biomaterials for biomedical implants. Included herein is both a brief summary of existing knowledge and concepts regarding silane-based thin films, along with an analysis of recent peer-reviewed publications and advances towards their practical application for biomedical coatings. Specifically, the review identifies innovative silane-based coatings according to their molecular identity and film structure and analyses their impact on the biocorrosion resistance, protein adsorption, cell viability, and antimicrobial properties of the overall coated implant...
August 9, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Nathalie Annonay, Fatiha Challali, Marie-Noëlle Labour, Valérie Bockelée, A Garcia-Sanchez, Florent Tetard, Marie-Paule Besland, Philippe Djemia, Frédéric Chaubet
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December 2018: Bioactive Materials
Chin-Ho Lee, Man-Chung Tang, Wai-Lung Cheung, Shiu-Lun Lai, Mei-Yee Chan, Vivian Wing-Wah Yam
We report the synthesis of alkynylgold(iii) complexes with an electron-transporting phosphine oxide moiety in the tridentate ligand and hole-transporting triarylamine moieties as auxiliary ligands to generate a new class of phosphine oxide-containing bipolar gold(iii) complexes for the first time. Such gold(iii) complexes feature high photoluminescence quantum yields of over 70% in 1,3-bis( N -carbazolyl)benzene thin films with relatively short excited-state lifetimes of less than 3.9 μs at a 20 wt% dopant concentration...
August 7, 2018: Chemical Science
Reza Y Purwoko, Iis Rosliana, Siti Sobariah, Nabila Hermana, Silvani Permatasari, Dewi Wulandari, Puji Sari, Ernie H Purwaningsih, Chaidir, Hans-Joachim Freisleben, Jeanne A Pawitan, Kusmarinah Bramono
Background: Recently, Phosphatidylcholine (PC) has been used as an off-label treatment for lipolysis injection, which is associated with inflammatory reaction due to sodium deoxycholate, an emulsifier, so that inflammation as side effect occurs in those patients. Liposome formulation from soybean lipid was thought to be a better and safer alternative. This study aimed to analyze the mechanism of Liposomal Soybean Phosphatidylcholine (LSPC) extract from Indonesian soybeans (containing 26% PC) to induce Adipose-derived Stem Cells (ASCs) death in vitro ...
July 2018: Avicenna Journal of Medical Biotechnology
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