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https://www.readbyqxmd.com/read/28817711/on-chip-detection-of-gel-transition-temperature-using-a-novel-micro-thermomechanical-method
#1
Tsenguun Byambadorj, Erfan Dashtimoghadam, Mohamadali Malakoutian, Benyamin Davaji, Lobat Tayebi, James E Richie, Chung Hoon Lee
We present a new thermomechanical method and a platform to measure the phase transition temperature at microscale. A thin film metal sensor on a membrane simultaneously measures both temperature and mechanical strain of the sample during heating and cooling cycles. This thermomechanical principle of operation is described in detail. Physical hydrogel samples are prepared as a disc-shaped gels (200 μm thick and 1 mm diameter) and placed between an on-chip heater and sensor devices. The sol-gel transition temperature of gelatin solution at various concentrations, used as a model physical hydrogel, shows less than 3% deviation from in-depth rheological results...
2017: PloS One
https://www.readbyqxmd.com/read/28817275/influence-of-sodium-chloride-on-the-formation-and-dissociation-behavior-of-co2-gas-hydrates
#2
Christine Carola Holzammer, Judith Maria Schicks, Stefan Will, Andreas Siegfried Braeuer
We present an experimental study on the formation and dissociation characteristics of carbon dioxide (CO2) gas hydrates using Raman spectroscopy. The CO2 hydrates were formed from sodium-chloride/water solutions with salinities of 0-10 wt-%, which were pressurized with liquid CO2 in a stirred vessel at 6 MPa and a subcooling of 9.5 K. The formation of the CO2 hydrate resulted in a hydrate gel where the solid hydrate can be considered as the continuous phase that includes small amounts of a dispersed liquid water-rich phase that has not been converted to hydrate...
August 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28817106/ag-coated-heterostructures-of-zno-tio%C3%A2-delaminated-montmorillonite-as-solar-photocatalysts
#3
Carolina Belver, Mariana Hinojosa, Jorge Bedia, Montserrat Tobajas, Maria Ariadna Alvarez, Vicente Rodríguez-González, Juan Jose Rodriguez
Heterostructures based on ZnO-TiO₂/delaminated montmorillonite coated with Ag have been prepared by sol-gel and photoreduction procedures, varying the Ag and ZnO contents. They have been thoroughly characterized by XRD, WDXRF, UV-Vis, and XPS spectroscopies, and N₂ adsorption, SEM, and TEM. In all cases, the montmorillonite was effectively delaminated with the formation of TiO₂ anatase particles anchored on the clay layer's surface, yielding porous materials with high surface areas. The structural and textural properties of the heterostructures synthesized were unaffected by the ZnO incorporated...
August 17, 2017: Materials
https://www.readbyqxmd.com/read/28816534/seven-familial-dysalbuminemic-hyperthyroxinemia-cases-in-three-unrelated-japanese-families-and-high-performance-liquid-chromatography-analysis-of-the-thyroxine-binding-profile
#4
Hidekazu Nagano, Yoshinori Nakagawa, Naofumi Ishikawa, Yuya Watanabe, Yui Miyabayashi, Akitoshi Nakayama, Masanori Fujimoto, Eri Komai, Akina Shiga, Ai Tamura, Takashi Kono, Tomoko Takiguchi, Seiichiro Higuchi, Ikki Sakuma, Naoko Hashimoto, Sawako Suzuki, Hisashi Koide, Kotaro Yokote, Tomoaki Tanaka
OBJECTIVE: Familial dysalbuminemic hyperthyroxinemia (FDH) is caused by abnormal human serum albumin (HSA) with an increased thyroxine (T4) affinity leading to euthyroid hyperthyroxinemia. One- and two-step immunoassay of serum samples from FDH patients (e.g., Japanese patients) with the HSA R218P mutation can yield false-positive free thyroxine (FT4) results. Therefore, it is difficult to distinguish FDH from syndrome of inappropriate secretion of thyroid-stimulating hormone (e.g., syndrome of resistance to thyroid hormone, thyroid-stimulating hormone [TSH]-producing pituitary adenoma), even when multiple assays are used...
August 17, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/28816433/syndiotactic-polystyrene-based-ionogel-membranes-for-high-temperature-electrochemical-applications
#5
Prasad Raut, Wenfeng Liang, Yu-Ming Chen, Yu Zhu, Sadhan C Jana
This work focuses on ionogel membranes for use in Li-ion batteries fabricated from syndiotactic polystyrene (sPS) gels filled with ionic liquids (ILs). The aim is to increase the operating temperature of Li-ion batteries. s. Thermal stability and safe operation of Li-ion batteries are two key attributes for their success in hybrid vehicles and other high temperature applications. The volatility of the liquid electrolytes in current lithium-ion battery technology causes thermal runaway leading to fire, explosion, and swelling of the cell...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816429/smart-cellulose-nanofluids-produced-by-tunable-hydrophobic-association-of-polymer-grafted-cellulose-nanocrystals
#6
Yea Ram Lee, Daehwan Park, Sang Koo Choi, Miju Kim, Heung Soo Baek, Jin Nam, Chan Bok Chung, Chinedum O Osuji, Jin Woong Kim
Cellulose fibrils, unique plant-derived semi-crystalline nanomaterials with exceptional mechanical properties, have significant potential for rheology modification of complex fluids due to their ability to form a physically associated semi-flexible fibrillary network. Here, we report new associative cellulose nanocrystals (ACNCs) with stress-responsive rheological behaviors in an aqueous solution. The surface-mediated living radical polymerization was employed to graft poly (stearyl methacrylate-co-2-methacryloxyethyl phosphorylcholine) brushes onto the nanofibrils, and then 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation was conducted to produce nanoscale ACNCs in the aqueous solution...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816400/silica-modified-luminescent-lapo4-eu-lapo4-sio2-core-shell-nanorods-synthesis-structural-and-luminescent-properties
#7
Anees A Ansari
Monoclinic-type tetragonal LaPO4 :Eu (core) and LaPO4 :Eu@LaPO4 (core/shell) nanorods (NRs) were successfully prepared using a urea-based co-precipitation process under ambient conditions. An amorphous silica layer was coated around the luminescent core/shell NRs via the sol-gel process to improve their solubility and colloidal stability in aqueous and non-aqueous media. The prepared nano-products were systematically characterized by X-ray diffraction pattern, transmission electron microscopy, energy dispersive X-ray analysis, and FTIR, UV/Vis, and photoluminescence spectroscopy to examine their phase purity, crystal phase, surface chemistry, solubility and luminescence characteristics...
August 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28816397/a-flow-through-column-electrolytic-cell-for-supercritical-fluid-chromatography
#8
Kazuhiro Yamamoto, Tatsuya Ueki, Naoyuki Higuchi, Kouji Takahashi, Akira Kotani, Hideki Hakamata
A novel flow-through column electrolytic cell was proposed as a detector to obtain current signals for supercritical fluid chromatography. The electrochemical cell consisted of two electrodes and its holder, and a working and a counter electrode were fabricated from 192 carbon strings, which were composed of 400 carbon fibers of 10 μm in diameter filled into a heat-shrinkable tube. These electrodes were placed in the center of a holder made from polyether ether ketone blocks and they were separated by polytetrafluoroethylene membrane filters...
August 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28816322/ultrasonication-enhanced-gelation-properties-of-a-versatile-amphiphilic-formamidine-based-gelator-exhibiting-both-organogelation-and-hydrogelation-abilities
#9
Jürgen Bachl, Diego Sampedro, Judith Mayr, David Díaz Díaz
We describe the preparation of a novel amphiphilic gelator built from a formamidine core, which is able to form a variety of physical organogels and hydrogels at concentrations ranging from 15 to 150 mg mL(-1). Interestingly, ultrasound treatment of isotropic solutions (i.e., gel-precursor) resulted in a remarkable enhancement of the gelation kinetics as well as the gelation scope and characteristic gel properties (e.g., critical gelation concentration, gel-to-sol transition temperature, viscoelastic moduli) in comparison to the heating-cooling protocol typically used to obtain supramolecular gels...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816319/novel-multiple-phosphorescence-in-nanostructured-zinc-oxide-and-calculations-of-correlated-colour-temperature
#10
Sagnik Das, Uttam Kumar Ghorai, Rajib Dey, Chandan Kumar Ghosh, Mrinal Pal
The design and development of novel and high quantum efficiency luminescent materials, such as phosphors, having tuneability in properties, have received tremendous interest among scientists. In this paper, we have achieved for the first-time multiple phosphorescence (blue and green) having a life-time of ∼10 μs in nanostructured zinc oxide that was synthesized using an easy and facile sol-gel method. Importantly, the photoluminescence (PL) intensity and the phosphorescence life-time could be tuned by controlling the annealing temperature under a reducing atmosphere...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816281/-application-of-flurbiprofen-axetil-in-pain-management-associated-during-transrectal-ultrasound-guided-prostate-biopsy
#11
K Lan, W B Yang, X W Zhang, W J Bai, Q Li, T Xu
OBJECTIVE: To examine the effects of perioperative intravenous administration of flurbiprofen axetil (FA) on pain associated with transrectal ultrasound-guided prostate biopsy. METHODS: This was a randomized,controlled study. Eighty-one patients who underwent 12 core prostate biopsy were included in the study. The patients were randomly assigned to one of three groups (n=27 in each) by type of procedure during prostate biopsy. Group intrarectal local anesthesia (IRLA) received intrarectal 5% (0...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28816269/-microrna-differential-expression-profile-in-tuberous-sclerosis-complex-cell-line-tsc2-mefs-and-normal-cell-line-tsc2-mefs
#12
Y Cai, H Guo, H Z Li, W D Wang, Y S Zhang
OBJECTIVE: Tuberous sclerosis complex (TSC) is a multisystem genetic disorder caused by mutations in the TSC1 and TSC2 genes, but the molecular events contributing to TSC are not well understood. However, little is known about the role of microRNAs in TSC. To explore the microRNA differential expression profile between tuberous sclerosis complex cell line TSC2(-/-) MEFs and normal type cell line TSC2(+/+) MEFs, and to provide new clues to study the mechanism of microRNA function in tuberous sclerosis complex...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28816032/high-order-in-a-self-assembled-iridium-iii-complex-gelator-towards-nanostructured-iro2-thin-films
#13
Francesca Scarpelli, Andreea Ionescu, Iolinda Aiello, Massimo La Deda, Alessandra Crispini, Mauro Ghedini, Elvira Brunelli, Settimio Sesti, Nicolas Godbert
The preparation and characterization of a new metallogelator based on the Ir(III) discrete cyclometallated complex [(ppy)2Ir(bpy)](CH3CH2OCH2CO2) are reported, where H(ppy) is 2-phenylpiridine and bpy is 2,2'-bipyridine, used as ancillary ligand. The compound is able to self-assemble in water in a range of concentrations between 3% and 6 % w/w, creating a luminescent ordered supramolecular gel. The gel and xerogel architectures were investigated through POM, SEM and TEM microscopies coupled with Powder X-Ray Diffraction...
August 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815932/polymer-based-hybrid-nanocomposites-a-progress-toward-enhancing-interfacial-interaction-and-tailoring-advanced-applications
#14
REVIEW
Chang-Sik Ha
Organic/inorganic hybrid nanocomposites, in particular polymer based hybrid nanocomposites, constitute emerging advanced materials since they combine unique properties from the inorganic and organic (i. e. polymeric) components. We investigated three different hybrid nanocomposites depending on dimensions of the dispersed phase in the nanometer range,; polymer-layered silicate (PLS) nanocomposites where polymers are mixed with layered silicates, polymer/graphene oxide hybrid nanocomposites, and polymer hybrid nanocomposites with reinforcing polymers with isodimensional phases of inorganic silicas using sol-gel reactions...
August 17, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28815238/-effect-of-sintering-temperature-on-mechanical-properties-of-dental-zirconia-toughened-alumina-ceramics
#15
Jiang-Yuan Fan, Ting-Ting Lin, Fang-Xuan Hu, Rui-Bin Zheng, Fan Fan, Jian-Feng Ma
PURPOSE: To investigate the effect of sintering temperature on mechanical properties of dental zirconia toughened alumina (ZTA) ceramics prepared by gel-casting technique. METHODS: The samples prepared by gel-casting were sintered at 1100, 1200, 1250, 1300 and 1400degrees centigrade for each group. The flexural strength, fracture toughness, Vickers hardness and brittleness index were obtained and microscopic morphology of each group was observed under scanning electron microscope (SEM)...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28814804/a-unique-thermo-induced-gel-to-gel-transition-in-a-ph-sensitive-small-molecule-hydrogel
#16
Hongtao Xie, Mehran Asad Ayoubi, Wensheng Lu, Jide Wang, Jianbin Huang, Wei Wang
For a hydrogel based on a zwitterionic dendritic surfactant, we report an apparently unprecedented reversible temperature-induced gel-to-gel phase transition below the melting point of its alkyl chains, where the supramolecular self-assembly of surfactant molecules underwent a dramatic transformation from low-temperature surfactant bilayers to high-temperature entangled surfactant worm-like micelles.
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814112/an-injectable-in-situ-gel-with-cubic-and-hexagonal-nanostructures-for-local-treatment-of-chronic-periodontitis
#17
Liling Mei, Yecheng Xie, Xintian Huang, Jintian Chen, Ying Huang, Bei Wang, Hui Wang, Xin Pan, Chuanbin Wu
Periodontitis is a chronic bacterial infection, and its effective treatment is dependent on the retention of antibiotics of effective concentrations at the periodontal pockets. In this study, a solution-gel based inverse lyotropic liquid crystalline (LLC) system was explored to deliver metronidazole to the periodontal pockets for local treatment of periodontitis. It was found that the metronidazole-loaded LLC precursor spontaneously transformed into gel in the presence of water in the oral cavity. The low viscosity of the precursor would allow its penetration to the rather difficult to reach infection sites, while the adhesiveness and crystalline nanostructures (inverse bicontinuous cubic Pn3m phase and inverse hexagonal phase) of the formed gel would permit its firm adhesion to the periodontal pockets...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28813685/purification-and-characterization-of-two-novel-peroxidases-from-the-dye-decolorizing-fungus-bjerkandera-adusta-strain-cx-9
#18
Khelifa Bouacem, Hatem Rekik, Nadia Zaraî Jaouadi, Bilal Zenati, Sidali Kourdali, Mohamed El Hattab, Abdelmalek Badis, Rachid Annane, Samir Bejar, Hocine Hacene, Amel Bouanane-Darenfed, Bassem Jaouadi
Two extracellular peroxidases from Bjerkandera adusta strain CX-9, namely a lignin peroxidase (called LiP BA45) and manganese peroxidase (called MnP BA30), were purified simultaneously by applying successively, ammonium sulfate precipitation-dialysis, Mono-S Sepharose anion-exchange and Sephacryl S-200 gel filtration and biochemically characterized. The sequence of their NH2-terminal amino acid residues showed high homology with those of fungi peroxidases. MALDI-TOF/MS analysis revealed that the purified enzymes MnP BA30 and LiP BA45 were a monomers with a molecular masses 30125...
August 13, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28813598/functional-microcapsules-with-hybrid-shells-made-via-sol-gel-reaction-within-double-emulsions
#19
David G Moore, Jonathan V A Brignoli, Patrick Alberto Rühs, André R Studart
Microcapsules with organic-inorganic hybrid shells can be used as functionally-responsive delivery systems that are attractive for a broad range of applications. Hybrid-shell microcapsules have often been synthesized by the assembly of solid inorganic nanoparticles and polymers. Efforts to extend this approach to microfluidic emulsification have been hampered by problems with clogging and flow instabilities when utilizing dispersions of solid particles. In this work, hybrid shell microcapsules are synthesized through the reaction of liquid precursors, eliminating the use of solid dispersions...
August 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28813043/folic-acid-supramolecular-ionogels
#20
Rahul Ranjan, Kamla Rawat, H B Bohidar
Herein, we report on folic acid (FA, a low molecular weight gelator) thermoreversible supramolecular organo (in 1 : 1 (v/v) water-DMSO binary solvent), and ionogels made in 1-ethyl-3-methyl imidazolium chloride, [C2mim][Cl], and 1-octyl-3-methyl imidazolium chloride, [C8mim][Cl], solutions with 0.1 ≤ [IL] ≤ 5% (w/v). The self-assembled fibrils of folic acid were largely formed due to secondary forces, such as π-π stacking, H-bonding, and hydrophobic interactions above a gelator concentration of 0...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
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