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https://www.readbyqxmd.com/read/30316795/tpgs-modified-nanoliposomes-as-an-effective-ocular-delivery-system-to-treat-glaucoma
#1
Quansheng Jin, Huili Li, Zhaohui Jin, Lingjing Huang, Fazhan Wang, Yang Zhou, Yongmei Liu, Chunling Jiang, James Oswald, Jinhui Wu, Xiangrong Song
The aim of this study is to investigate the potential of D-alpha-tocopheryl poly (ethylene glycol 1000) succinate (TPGS) modified nanoliposomes as an ophthalmic delivery system of brinzolamide (Brz) for glaucoma treatment. The Brz loaded nanoliposomes containing TPGS (T-LPs/Brz) were firstly developed by a thin-film dispersion method. The average particle size was 96.87 ± 4.43 nm. The entrapment efficiency of the Brz was 95.41 ± 3.03% and the drug loading was 4.00±0.13%. T-LPs/Brz exhibited obvious sustained release of Brz; in stark contrast to the normal liposomes of Brz (LPs/Brz) and the commercial formulation AZOPT® (Brz ophthalmic suspension, Brz-Sus)...
October 11, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/30316275/molecular-structure-of-the-substrate-induced-thin-film-phase-of-tetracene
#2
Linus Pithan, Dmitrii Nabok, Caterina Cocchi, Paul Beyer, Giuliano Duva, Joseph Simbrunner, Jonathan Rawle, Chris Nicklin, Peter Schäfer, Claudia Draxl, Frank Schreiber, Stefan Kowarik
We present a combined experimental and theoretical study to solve the unit-cell and molecular arrangement of the tetracene thin film (TF) phase. TF phases, also known as substrate induced phases (SIPs), are polymorphs that exist at interfaces and decisively impact the functionality of organic thin films, e.g., in a transistor channel, but also change the optical spectra due to the different molecular packing. As SIPs only exist in textured ultrathin films, their structure determination remains challenging compared to bulk materials...
October 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/30315227/high-conductivity-of-ultrathin-nanoribbons-of-srruo-3-on-srtio-3-probed-by-infrared-spectroscopy
#3
E Falsetti, A Kalaboukhov, A Nucara, M Ortolani, M Corasaniti, L Baldassarre, P Roy, P Calvani
SrRuO3 (SRO) is a perovskite increasingly used in oxide-based electronics both for its intrinsic metallicity, which remains unaltered in thin films and for the ease of deposition on dielectric perovskites like SrTiO3 , (STO) to implement SRO/STO microcapacitors and other devices. In order to test the reliability of SRO/STO also as high-current on-chip conductor, when the SRO dimensions are pushed to the nanoscale, here we have measured the electrodynamic properties of arrays of nanoribbons, fabricated by lithography starting from an ultrathin film of SRO deposited on a STO substrate...
October 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30314379/transparent-photocatalytic-thin-films-on-flexible-polymer-substrates
#4
Nives Vodišek, Andraž Šuligoj, Dorota Korte, Urška Lavrenčič Štangar
Self-cleaning and/or photocatalytic films on polymer substrates have found numerous applications during the past decades. However, the common demand for high-temperature post synthesis treatment limits the application to temperature resistant substrates only. Herein, we prepared self-cleaning photocatalytic films on four thermosensitive polymeric substrates: polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), and acryl coated polyester (PES) fabric (D2) with poly(vinylidene fluoride) (PVDF) containing lacquer (D1)...
October 11, 2018: Materials
https://www.readbyqxmd.com/read/30312944/development-of-a-solid-phase-microextraction-spme-fiber-protector-and-its-application-in-flammable-liquid-residues-analysis
#5
Arnon Grafit, Dan Muller, Sarit Kimchi, Yaniv Y Avissar
Solid-phase microextraction (SPME) has been established as a very powerful alternative to traditional extraction methods since its introduction in the early 1990s. The heart of the SPME device is an expensive thin and very delicate fused-silica fiber, coated with a thin polymer film. When extracted, the fiber may bend and break. Due to the fragility of the SPME fiber, a fiber protector device is proposed. The protector is easily assembled on the SPME device and can easily be removed by unscrewing for sampling to the injector...
September 17, 2018: Forensic Science International
https://www.readbyqxmd.com/read/30312908/development-and-evaluation-of-diffusive-gradients-in-thin-films-based-on-nano-sized-zinc-oxide-particles-for-the-in-situ-sampling-of-tetracyclines-in-pig-breeding-wastewater
#6
Nan You, Hui Yao, Yun Wang, Hong-Tao Fan, Chang-Song Wang, Ting Sun
The pollution of antibiotics, including tetracyclines (TCs), in aquatic environments has become an issue of concern in recent years. Herein, an in situ sampling of TCs in pig breeding wastewater that utilizes the technique of diffusive gradients in thin films (DGT), based on commercial nanosized ZnO (nanoZnO) particles as the potential effective binding agent and a polyethersulfone (PES) membrane as the diffusion layer, was developed. The diffusion coefficients of tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC) in a PES membrane at 25 °C were (1...
September 25, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30312853/investigating-chemical-and-structural-instabilities-of-lead-halide-perovskite-induced-by-electron-beam-irradiation
#7
Xuanyu Chen, Zhiwei Wang
Chemical and structural instabilities of lead halide perovskites remain a major obstacle to their large-scale applications in photovoltaic solar cells and optoelectronic devices. Herein we report on a comparative investigation of electron beam irradiation effects on (all-inorganic) CsPbI3 and (organic-inorganic hybrid) CH3 NH3 PbI3 halide perovskite thin films by transmission electron microscopy. Upon continuous electron beam irradiation with high dose rates, CsPbI3 exhibits rather rapid morphological change and compositional degradation within irradiated regions, which are attributed to the radiolysis effect and probably assisted by electron beam heating and Coulomb forces...
September 22, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30312795/zirconium-metal-organic-frameworks-based-dgt-technique-for-in-situ-measurement-of-dissolved-reactive-phosphorus-in-waters
#8
Wenxiu Qin, Yue Gu, Guozhong Wang, Tianxing Wu, Haimin Zhang, Xiaoxian Tang, Yunxia Zhang, Huijun Zhao
In an effort to provide early warnings for the occurrence of eutrophication, it is highly desirable to develop an accurate and efficient technique to ensure continuous monitoring of dissolved reactive phosphorus (DRP) in the aquatic environment from the viewpoint of environmental management. Herein, a new diffusive gradient in thin film (DGT) technique was developed and evaluated for in situ measurement of DRP in waters, in which Zr-based metal organic frameworks (MOFs, UiO-66) were utilized as aqueous binding agent (abbreviated as UiO-66 DGT)...
October 5, 2018: Water Research
https://www.readbyqxmd.com/read/30312051/ferroelectric-problem-beyond-the-conventional-scaling-law
#9
Qi-Jun Ye, Zhi-Yuan Liu, Yexin Feng, Peng Gao, Xin-Zheng Li
Ferroelectric (FE) size effects against the scaling law were reported recently in ultrathin group-IV monochalcogenides, and extrinsic effects (e.g., defects and lattice strains) were often resorted to. Via first-principles based finite-temperature (T) simulations, we reveal that these abnormalities are intrinsic to their unusual symmetry breaking from bulk to thin film. Changes of the electronic structures result in different order parameters characterizing the FE phase transition in bulk and in thin films, and invalidation of the scaling law...
September 28, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/30311745/highly-efficient-organic-blue-electroluminescent-materials-and-devices-with-mesoscopic-structures
#10
REVIEW
Mengying Bian, Zhijian Chen, Bo Qu, Lixin Xiao
Due to the difficulty in achieving high efficiency and high color purity simultaneously, blue emission is the limiting factor for the performance and stability of OLEDs. Since 2003, we have been working on organic light-emitting diodes (OLEDs), especially on blue light. After a series of molecular designs, novel strategies have been proposed from different aspects. At first, highly efficient deep blue emission could be achieved through molecular design with highly twisted structure to suppress fluorescence quenching and redshift...
October 12, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30311616/structure-and-stimuli-responsiveness-of-all-dna-dendrimers-theory-and-experiment
#11
Clemens Jochum, Nataša AdŽić, Emmanuel Stiakakis, Thomas L Derrien, Dan Luo, Gerhard Kahl, Christos N Likos
We present a comprehensive theoretical and experimental study of the solution phase properties of a DNA-based family of nanoparticles - dendrimer-like DNA molecules (DL-DNA). These charged DNA dendrimers are novel macromolecular aggregates, which hold high promise in targeted self-assembly of soft matter systems in the bulk and at interfaces. To describe the behaviour of this family of dendrimers (with generations ranging from G1 to G7), we use a theoretical model in which base-pairs of a single DL-DNA molecule are modeled by charged monomers, whose interactions are chosen to mimic the equilibrium properties of DNA correctly...
October 12, 2018: Nanoscale
https://www.readbyqxmd.com/read/30311331/wafer-scale-fabrication-of-ultrathin-flexible-electronic-systems-via-capillary-assisted-electrochemical-delamination
#12
Heng Zhang, Youdi Liu, Chao Yang, Li Xiang, Youfan Hu, Lian-Mao Peng
Electronic systems on ultrathin polymer films are generally processed with rigid supporting substrates during fabrication, followed by delamination and transfer to the targeted working areas. The challenge associated with an efficient and innocuous delamination operation is one of the major hurdles toward high-performance ultrathin flexible electronics at large scale. Herein, a facile, rapid, damage-free approach is reported for detachment of wafer-scale ultrathin electronic foils from Si wafers by capillary-assisted electrochemical delamination (CAED)...
October 11, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30310894/unusual-effects-in-single-molecule-tautomerization-hemiporphycene
#13
Victoriya Kim, Lukasz Piatkowski, Maria Pszona, Regina Jäger, Jakub Ostapko, Jerzy Sepioł, Alfred J Meixner, Jacek Waluk
Parent hemiporphycene, a recently obtained constitutional isomer of porphyrin, exists in room temperature solutions and polymer matrices in the form of two trans tautomers interconverting via double hydrogen transfer. Using confocal fluorescence microscopy, it was possible to monitor tautomerization in single hemiporphycene molecules embedded in a PMMA film by monitoring the spectral and temporal evolution of their fluorescence spectra. The emission spectra of the two tautomeric forms are similar to those obtained from ensemble studies...
October 12, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30310760/a-novel-antibacterial-membrane-electrode-based-on-bacterial-cellulose-polyaniline-agno-3-composite-for-bio-potential-signal-monitoring
#14
Nannan Zhang, Lina Yue, Yajie Xie, Oluwarotimi William Samuel, Olatunji Mumini Omisore, Weihua Pei, Xiao Xing, Chuang Lin, Yudong Zheng, Lei Wang
We propose a flexible, dry, and antibacterial electrode with a low and stable skin electrode contact impedance for bio-potential signal monitoring. We fabricated a bacterial cellulose/polyaniline/AgNO3 nanocomposite membrane (BC/PANI/AgNO3 ) and used it for bio-potential signal monitoring. The bacterial cellulose (BC) provides a 3-D nanoporous network structure, and it was used as a substrate material in the BC/PANI/AgNO3 nanocomposite membrane. Polyaniline (PANI) and AgNO3 , acting as conductive and antibacterial components, respectively, were polymerized and deposited on the surfaces of BC nanofibers to produce uniform thin film membrane with flexible, antibacterial, and conductive properties...
2018: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/30310593/a-photochemical-layer-by-layer-solution-process-for-preparing-organic-semiconducting-thin-films-having-the-right-material-at-the-right-place
#15
Mitsuharu Suzuki, Yuji Yamaguchi, Kensuke Uchinaga, Katsuya Takahira, Cassandre Quinton, Shinpei Yamamoto, Naoto Nagami, Mari Furukawa, Ken-Ichi Nakayama, Hiroko Yamada
The synergistic action of properly integrated semiconducting materials can bring about sophisticated electronic processes and functions. However, it is often a great challenge to achieve optimal performance in organic devices because of the limited control over the distribution of different materials in active layers. Here, we employ a unique photoreaction-based layer-by-layer solution process for preparing ternary organic photovoltaic layers. This process is applicable to a variety of compounds from wide-band-gap small molecules to narrow-band-gap π-extended systems, and enables the preparation of multicomponent organic semiconducting thin films having the right compound at the right place...
August 28, 2018: Chemical Science
https://www.readbyqxmd.com/read/30310589/characterisation-of-redox-states-of-metal-organic-frameworks-by-growth-on-modified-thin-film-electrodes
#16
Tamoghna Mitra, Florian Moreau, Adam Nevin, Carlo U Perotto, Alex Summerfield, E Stephen Davies, Elizabeth A Gibson, Timothy L Easun, Martin Schröder
The application of metal-organic framework (MOF) materials in electrochemical and electrochromic devices remains rare. One of the main reasons for this is the inability to readily access their detailed electrochemistry. The inherent insolubility of these materials does not allow interrogation by traditional solution-based electrochemical or spectroscopic methods. In this study, we report a straightforward alternative approach to the spectroelectrochemical study of MOFs. We have used two systems as exemplars in this study, MFM-186 and MFM-180...
August 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/30310173/growth-and-superconductivity-of-niobium-titanium-alloy-thin-films-on-strontium-titanate-001-single-crystal-substrates-for-superconducting-joints
#17
Yuhei Shimizu, Kazuhiko Tonooka, Yoshiyuki Yoshida, Mitsuho Furuse, Hiroshi Takashima
Aiming to introduce NbTi alloy superconducting joints for REBa2 Cu3 O7-δ (REBCO, RE: rare-earth element) superconducting wires, NbTi alloy thin films were deposited at room temperature on SrTiO3 (STO) (001) single-crystal substrates, which have a high lattice matching with REBCO (001). The strain, crystallinity, surface morphology, and superconducting property of the films with various thicknesses were investigated. The NbTi films grew in the orientation with (110)NbTi//(001)STO:[001]NbTi and [11-0] NbTi//[100]STO; that is, the NbTi lattices had two directions in the (110) of NbTi...
October 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30308115/color-engineering-of-silicon-nitride-surface-to-characterize-the-polydopamine-refractive-index
#18
Milena Vega, Eva Martín Del Valle, Maximiliano Perez, Gema Marcelo, Carlos Pecharroman
A simple methodology to generate polydopamine (PDA) surfaces featured with color due to the thin film interference phenomena is presented. It is based on depositing ultra-thin films of polydopamine on a Si/Si3N4 wafer which exhibits an interferential reflectance maximum right at the visible/UV boundary (~ 400 nm). Therefore, a small deposit of PDA modifies the optical path, in such manner that the wavelength of the maximum of reflectance red shifts. Because the human eye is very sensitive to any change of the light spectral distribution at the visible region, very small film thickness changes (~30 nm) are enough to notably modify the perceived color...
October 11, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/30307015/near-interface-ionic-transport-in-oxygen-vacancy-stabilized-cubic-zirconium-oxide-thin-films
#19
Mohsin Raza, Simone Sanna, Lucia Dos Santos Gómez, Eric Gautron, Abdel Aziz El Mel, Nini Pryds, Rony Snyders, Stéphanos Konstantinidis, Vincenzo Esposito
The cubic phase of pure zirconia (ZrO2) is stabilized in dense thin films through a controlled introduction of oxygen vacancies (O defects) by cold-plasma-based sputtering deposition. Here, we show that the cubic crystals present at the film/substrate interface near-region exhibit fast ionic transport, which is superior to what is obtained with similar yttrium-stabilized cubic zirconia thin films.
October 11, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30306982/carbon-nanodot-aqueous-binding-phase-based-diffusive-gradients-in-thin-films-device-for-measurement-of-dissolved-copper-and-lead-species-in-the-aquatic-environment
#20
Nan You, Zhong-Ming Feng, Yun Wang, Hong-Tao Fan, Ting Sun
A reliable method for the determination of dissolved Cu2+ and Pb2+ species in water via a diffusive gradient in thin films (DGT) device using water-soluble carbon nanodots (CD) as the binding agent was developed (CD-DGT). The uptake of dissolved Cu2+ and Pb2+ species by CD-DGT increased linearly with a deployment time of over 120 h, while the uptake of Ca2+, Mg2+, Cd2+, Zn2+, Ni2+, and Co2+ by CD-DGT has no significant linear accumulation during the same deployment time. The concentrations of the dissolved Cu2+ and Pb2+ species measured using CD-DGT are in good agreement with the element concentrations spiked directly in a tested synthesis solution...
October 11, 2018: Analyst
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