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https://www.readbyqxmd.com/read/29934803/the-effect-of-inkjet-printing-over-polymeric-films-as-potential-buccal-biologics-delivery-systems
#1
Miguel Montenegro-Nicolini, Patricio E Reyes, Miguel O Jara, Parameswara R Vuddanda, Andrónico Neira-Carrillo, Nicole Butto, Sitaram Velaga, Javier O Morales
The buccal mucosa appears as a promissory route for biologic drug administration, and pharmaceutical films are flexible dosage forms that can be used in the buccal mucosa as drug delivery systems for either a local or systemic effect. Recently, thin films have been used as printing substrates to manufacture these dosage forms by inkjet printing. As such, it is necessary to investigate the effects of printing biologics on films as substrates in terms of their physical and mucoadhesive properties. Here, we explored solvent casting as a conventional method with two biocompatible polymers, hydroxypropyl methylcellulose, and chitosan, and we used electrospinning process as an electrospun film fabrication of polycaprolactone fibers due to its potential to elicit mucoadhesion...
June 22, 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29934604/cracking-effects-in-squashable-and-stretchable-thin-metal-films-on-pdms-for-flexible-microsystems-and-electronics
#2
Tiffany Baëtens, Emiliano Pallecchi, Vincent Thomy, Steve Arscott
Here, we study cracking of nanometre and sub-nanometre-thick metal lines (titanium, nickel, chromium, and gold) evaporated onto commercial polydimethylsiloxane (PDMS) substrates. Mechanical and electromechanical testing reveals potentially technologically useful effects by harnessing cracking. When the thin film metal lines are subjected to uniaxial longitudinal stretching, strain-induced cracks develop in the film. The regularity of the cracking is seen to depend on the applied longitudinal strain and film thickness-the findings suggest ordering and the possibility of creating metal mesas on flexible substrates without the necessity of lithography and etching...
June 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29934587/reconfigurable-photonic-generation-of-broadband-chirped-waveforms-using-a-single-cw-laser-and-low-frequency-electronics
#3
Hugues Guillet de Chatellus, Luis Romero Cortés, Côme Schnébelin, Maurizio Burla, José Azaña
Broadband radio-frequency chirped waveforms (RFCWs) with dynamically tunable parameters are of fundamental interest to many practical applications. Recently, photonic-assisted solutions have been demonstrated to overcome the bandwidth and flexibility constraints of electronic RFCW generation techniques. However, state-of-the-art photonic techniques involve broadband mode-locked lasers, complex dual laser systems, or fast electronics, increasing significantly the complexity and cost of the resulting platforms...
June 22, 2018: Nature Communications
https://www.readbyqxmd.com/read/29933060/systematic-modifications-of-amino-acid-based-organogelators-for-the-investigation-of-structure-property-correlations-in-drug-delivery-system
#4
Beibei Hu, Wei Sun, Haiting Li, Helin Sui, Sanming Li
Thermogels, used as multi-functional drug-loading materials, have properties that mainly rely on their gelator structure. Although a large variety of organogel systems are used as drug delivery carriers, relatively few have been investigated in terms of their structure-property correlations based on amino acid derivative gelators. Here, a series of amino acid based gelators were synthesized to explore the role of the gelator structure on functional properties, with the aim of establishing a connection between the molecular parameters and gel properties...
June 19, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29932677/phase-modulated-degenerate-parametric-amplification-microscopy
#5
Yunan Gao, Aaron J Goodman, Pin-Chun Shen, Jing Kong, William A Tisdale
Second-order nonlinear optical interactions, including second harmonic generation (SHG) and sum-frequency generation (SFG), can reveal a wealth of information about chemical, electronic, and vibrational dynamics at the nanoscale. Here, we demonstrate a powerful and flexible new approach, called phase-modulated degenerate parametric amplification (DPA). The technique, which allows for facile retrieval of both the amplitude and phase of the second-order nonlinear optical response, has many advantages over conventional or heterodyne-detected SHG, including the flexibility to detect the signal at either the second harmonic or fundamental field wavelength...
June 22, 2018: Nano Letters
https://www.readbyqxmd.com/read/29931979/laser-direct-writing-of-a-high-performance-all-graphene-humidity-sensor-working-in-a-novel-sensing-mode-for-portable-electronics
#6
Jinguang Cai, Chao Lv, Eiji Aoyagi, Sayaka Ogawa, Akira Watanabe
This paper reports a fast and highly sensitive all-graphene humidity sensor working in a novel alternating current (AC) detection mode for the first time, which is capable of humidity sensing on a smartphone for portable electronics. The humidity sensor is based on an interdigitated reduced graphene oxide/graphene oxide/reduced graphene oxide (rGO/GO/rGO) structure patterned by a facile laser direct writing method. It works in an AC sensing mode with a rectangular input voltage wave and an output voltage wave instead of conventionally measuring resistance, impedance or capacitance, exhibiting a dramatically enhanced sensitivity by about 45 times compared to the low and unstable response in DC mode...
June 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29931801/photocatalytic-reduction-of-graphene-oxide-tio-2-nanocomposites-for-improving-resistive-switching-memory-behaviors
#7
Xiaoning Zhao, Zhongqiang Wang, Yu Xie, Haiyang Xu, Jiaxue Zhu, Xintong Zhang, Weizhen Liu, Guochun Yang, Jiangang Ma, Yichun Liu
Graphene oxide (GO)-based resistive-switching (RS) memories offer the promise of low-temperature solution-processability and high mechanical flexibility, making them ideally suited for future flexible electronic devices. The RS of GO can be recognized as electric-field-induced connection/disconnection of nanoscale reduced graphene oxide (RGO) conducting filaments (CFs). Instead of operating an electrical FORMING process, which generally results in high randomness of RGO CFs due to current overshoot, a TiO2 -assisted photocatalytic reduction method is used to generate RGO-domains locally through controlling the UV irradiation time and TiO2 concentration...
June 21, 2018: Small
https://www.readbyqxmd.com/read/29931567/fulcrum-flexibility-of-the-main-curve-predicts-postoperative-shoulder-imbalance-in-selective-thoracic-fusion-of-adolescent-idiopathic-scoliosis
#8
Soren Ohrt-Nissen, Vijay H D Kamath, Dino Samartzis, Keith Dip Kei Luk, Jason Pui Yin Cheung
PURPOSE: To identify preoperative predictors for postoperative shoulder imbalance (PSI) after corrective surgery of adolescent idiopathic scoliosis (AIS) and using the fulcrum-bending radiograph to assess flexibility. METHODS: A consecutive surgical cohort of AIS patients undergoing selective thoracic fusion with alternate-level pedicle screw fixation was prospectively studied. Preoperative anteroposterior, lateral and fulcrum-bending radiographs were analysed. Postoperatively, a minimum of 2 years clinical and imaging follow-up was performed of all patients...
June 21, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29929963/universal-inverse-design-of-surfaces-with-thin-nematic-elastomer-sheets
#9
Hillel Aharoni, Yu Xia, Xinyue Zhang, Randall D Kamien, Shu Yang
Programmable shape-shifting materials can take different physical forms to achieve multifunctionality in a dynamic and controllable manner. Although morphing a shape from 2D to 3D via programmed inhomogeneous local deformations has been demonstrated in various ways, the inverse problem-finding how to program a sheet in order for it to take an arbitrary desired 3D shape-is much harder yet critical to realize specific functions. Here, we address this inverse problem in thin liquid crystal elastomer (LCE) sheets, where the shape is preprogrammed by precise and local control of the molecular orientation of the liquid crystal monomers...
June 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29929371/wrinkle-and-edge-adsorption-of-aromatic-compounds-on-graphene-oxide-as-revealed-by-atomic-force-microscopy-molecular-dynamics-simulation-and-density-functional-theory
#10
Huan Tang, Ying Zhao, Sujie Shan, Xiaonan Yang, Dongmei Liu, Fuyi Cui, Baoshan Xing
In this work, the favorable adsorption sites of aromatic compounds (ACs) on graphene oxide (GO) are characterized with both experimental and theoretical approaches. The results show that ACs exhibit a strong preference in adsorbing near the wrinkles and edges. Further analyses reveal that the edge-adsorption is mainly guided by the stronger π-π interaction near edges, accompanied by a stronger hydrogen bond interaction between carboxyl groups and ACs. Additionally, the water-mediated steric hindrance and flexibility of carboxyl groups also contribute to the edge-adsorption...
June 21, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29927605/high-field-transport-and-velocity-saturation-in-synthetic-monolayer-mos-2
#11
Kirby K H Smithe, Chris D English, Saurabh V Suryavanshi, Eric Pop
Two-dimensional semiconductors such as monolayer MoS2 are of interest for future applications including flexible electronics and end-of-roadmap technologies. Most research to date has focused on low-field mobility, but the peak current-driving ability of transistors is limited by the high-field saturation drift velocity, vsat . Here, we measure high-field transport as a function of temperature for the first time in high-quality synthetic monolayer MoS2 . We find that in typical device geometries self-heating can significantly reduce vsat during high-field operation...
June 21, 2018: Nano Letters
https://www.readbyqxmd.com/read/29927024/an-asymmetric-furan-thieno-3-2-b-thiophene-diketopyrrolopyrrole-building-block-for-annealing-free-green-solvent-processable-organic-thin-film-transistors
#12
Shang Ding, Zhenjie Ni, Mengxiao Hu, Gege Qiu, Jie Li, Jun Ye, Xiaotao Zhang, Feng Liu, Huanli Dong, Wenping Hu
A new asymmetric furan and thieno[3,2-b]thiophene flanked diketopyrrolopyrrole (TTFDPP) building block for conjugated polymers is designed and used to generate a donor-acceptor semiconducting polymer, poly[3-(furan-2-yl)-2,5-bis(2-octyldodecyl)-6-(thieno[3,2-b]thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-alt-thieno[3,2-b]thiophene] (abbreviated to PTTFDPP-TT), consisting of TTFDPP unit copolymerized with thieno[3,2-b]thiophene comonomer (TT), which is further synthesized. Results demonstrate that PTTFDPP-TT-based thin-film transistors in a bottom-gate bottom-contact device configuration exhibit typical hole-transporting property, with weak temperature dependence for charge carrier mobility from room temperature to 200 °C...
June 21, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29926871/seeds-screening-aqueous-synthesis-multiphase-interfacial-separation-and-in-situ-optical-characterization-of-invisible-ultrathin-silver-nanowires
#13
Xiao-Yang Zhang, Xiao-Mei Xue, Huan-Li Zhou, Ning Zhao, Feng Shan, Dan Su, Yi-Ran Liu, Tong Zhang
We report a multi-step synthetic method to obtain ultrathin silver nanowires (Ag NWs) from an aqueous solution with a ∼17 nm diameter average, and where some of them decreased down to 9 nm. Carefully designed seed screening processes including LED irradiation at high temperature for a short time, and then continuous H2O2 etching, and relative growth mechanisms of high-yield five-twinned pentagonal seeds and ultrathin Ag NWs in aqueous environment are detailed. Then, a rapid and simple multiphase interfacial assembly method particularly suitable for the separation of ultrathin Ag NWs from various by-products was demonstrated with a clear mechanism explanation...
June 21, 2018: Nanoscale
https://www.readbyqxmd.com/read/29926528/tailoring-the-thermal-and-mechanical-properties-of-graphene-film-by-structural-engineering
#14
Nan Wang, Majid Kabiri Samani, Hu Li, Lan Dong, Zhongwei Zhang, Peng Su, Shujing Chen, Jie Chen, Shirong Huang, Guangjie Yuan, Xiangfan Xu, Baowen Li, Klaus Leifer, Lilei Ye, Johan Liu
Due to substantial phonon scattering induced by various structural defects, the in-plane thermal conductivity (K) of graphene films (GFs) is still inferior to the commercial pyrolytic graphite sheet (PGS). Here, the problem is solved by engineering the structures of GFs in the aspects of grain size, film alignment, and thickness, and interlayer binding energy. The maximum K of GFs reaches to 3200 W m-1 K-1 and outperforms PGS by 60%. The superior K of GFs is strongly related to its large and intact grains, which are over four times larger than the best PGS...
June 21, 2018: Small
https://www.readbyqxmd.com/read/29924902/a-versatile-one-pot-synthesis-of-polysubstituted-cyclopent-2-enimines-from-%C3%AE-%C3%AE-unsaturated-amides-via-imino-nazarov-reaction
#15
Ting Fan, Ao Wang, Jia-Qi Li, Jian-Liang Ye, Xiao Zheng, Pei-Qiang Huang
The imino-Nazarov cyclization of the polysubstituted pentan-1,4-diene-3-imine is realized. To this aim, a one-pot procedure involving reductive alkenyliminylation of α,β-unsaturated secondary amides with potassium organotrifluoroborates followed by acid-catalyzed imino-Nazarov cyclization of the polysubstituted pentan-1,4-diene-3-imine intermediates is studied systematically. This mild, operationally simple, flexible, and high-yielding protocol efficiently affords polysubstituted pentan-1,4-diene-3-imines, cyclopentenimines, and α-amino cyclopentenones, which are useful scaffolds in organic synthesis...
June 20, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29924113/elastic-properties-and-breaking-strengths-of-gas-gase-and-gate-nanosheets
#16
Basant Chitara, Assaf Ya'akobovitz
Gallium sulphide (GaS), gallium selenide (GaSe), and gallium telluride (GaTe), belonging to the group-III monochalcogenide family, have shown promising optoelectronic performance over graphene and monolayer molybdenum disulphide (MoS2). However, to date, the mechanical properties of these materials have not been investigated, which hinders their utilisation in flexible electronics and optomechanics. Here, we characterize the elastic properties and breaking strengths of suspended two-dimensional (2D) nanosheets of GaS, GaSe, and GaTe, using atomic force microscopy...
June 20, 2018: Nanoscale
https://www.readbyqxmd.com/read/29921127/effects-of-vacancy-defects-on-the-electronic-and-optical-properties-of-monolayer-pbse
#17
Chinedu E Ekuma
Defect-engineering is promising for tailoring the properties of atomically thin materials. By creating defects via Se vacancies, we study the optoelectronic properties of monolayer PbSe. We obtain the single-particle properties using the density functional theory plus a first-principles-based typical medium approximation. The absorption spectra is explored by solving the Bethe-Salpeter equation. Our results reveal that monolayer PbSe is defect sensitive but defect-tolerant. The latter fingerprint is due to the absence of defect-induced in-gap, localized states...
June 20, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29921035/metabolic-flexibility-of-a-prospective-bioremediator-desulfitobacterium-hafniense-y51-challenged-in-chemostats
#18
Sviatlana Marozava, Raquel Vargas-López, Ye Tian, Juliane Merl-Pham, Martin Braster, Rainer U Meckenstock, Hauke Smidt, Wilfred F M Röling, Hans V Westerhoff
Desulfitobacterium hafniense Y51 has been widely used in investigations of perchloroethylene (PCE) biodegradation, but limited information exists on its other physiological capabilities. We investigated how D. hafniense Y51 confronts the debilitating limitations of not having enough electron donor (lactate), or electron acceptor (fumarate) during cultivation in chemostats. The residual concentrations of the substrates supplied in excess were much lower than expected. Transcriptomics, proteomics, and fluxomics were integrated to investigate how this phenomenon was regulated...
June 19, 2018: Environmental Microbiology
https://www.readbyqxmd.com/read/29916508/synthesis-and-characterization-of-a-flexible-metal-organic-framework-generated-from-mn-iii-and-the-4-4-bipyrazolate-ligand
#19
S Spirkl, M Grzywa, D Volkmer
The synthesis and crystal structure of a novel metal organic framework, constructed from MnIII, the 4,4'-bipyrazolate (BPZ) ligand and bridging hydroxyl groups is presented in this work. The network topology is identical to M-CFA-6 (M = Fe, Ga), but in the case of Mn-CFA-6, the structure crystallizes in the monoclinic crystal system due to the Jahn-Teller effect of the high spin d4 manganese(iii) centers. Thermal treatment of Mn-CFA-6 leads to decomposition of the framework above 150 °C. The porosity of Mn-CFA-6 was measured by carbon dioxide sorption, since solvent exchange and removal of the occluded solvent molecules leads to a compression of the pores...
June 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29916255/trifluoromethylation-of-electron-rich-alkenyl-iodides-with-fluoroform-derived-ligandless-cucf-3
#20
Jordi Mestre, Anton Lishchynskyi, Sergio Castillón, Omar Boutureira
We herein present a flexible approach for the introduction of CF3 units into a predefined site of electron-rich alkenes that exploits the regiocontrolled introduction of an iodine handle and subsequent trifluoromethylation of the C(sp2 )-I bond using fluoroform-derived "ligandless" CuCF3 . The broad substrate scope and functional group tolerance together with the scalability and purity of the resulting products enabled the controlled, late-stage synthesis of single regioisomers of complex CF3 -scaffolds such as sugars, nucleosides (antivirals), and heterocycles (indoles, chromones) with potential for academic and industrial applications...
June 19, 2018: Journal of Organic Chemistry
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