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https://www.readbyqxmd.com/read/28544851/low-ceiling-temperature-polymer-microcapsules-with-hydrophobic-payloads-via-rapid-emulsion-solvent-evaporation
#1
Shijia Tang, Mostafa Yourdkhani, Catherine M Possanza Casey, Nancy R Sottos, Scott R White, Jeffrey S Moore
We report a microencapsulation procedure based on rapid solvent evaporation to prepare microcapsules with hydrophobic core materials and low ceiling temperature polymer shell wall of cyclic poly(phthalaldehyde) (cPPA). We use and compare microfluidic and bulk emulsions. In both methods, rapid solvent evaporation following emulsification resulted in kinetically trapped core-shell microcapsules while slow evaporation resulted in acorn morphology. Through the systematic variation of encapsulation parameters, we found that polymer-to-core weight ratios higher than 1 and polymer concentration higher than 4...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28544178/transition-metal-nitride-core-noble-metal-shell-nanoparticles-as-highly-co-tolerant-catalysts
#2
Aaron Garg, Maria Milina, Madelyn Ball, Daniela Zanchet, Sean T Hunt, James A Dumesic, Yuriy Roman-Leshkov
Core-shell architectures offer an effective way to tune and enhance the properties of noble metal catalysts. Here, we demonstrate the synthesis of Pt shell on titanium tungsten nitride core nanoparticles (Pt/TiWN) by high temperature ammonia nitridation of a parent core-shell carbide material (Pt/TiWC). X-ray photoelectron spectroscopy revealed significant core-level shifts for Pt shells supported on TiWN cores, corresponding to increased stabilization of the Pt valence d-states. The modulation of the electronic structure of the Pt shell by the nitride core translated into enhanced CO tolerance during hydrogen electrooxidation in the presence of CO...
May 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544160/a-unified-continuous-flow-assembly-line-synthesis-of-highly-substituted-pyrazoles-and-pyrazolines
#3
Joshua Britton, Timothy F Jamison
A rapid and modular continuous flow synthesis of highly functionalized fluorinated pyrazoles and pyrazolines has been developed. Flowing fluorinated amines through sequential reactor coils mediates diazoalkane formation and [3+2] cycloaddition to generate more than 30 azoles in a telescoped fashion. Pyrazole cores are then sequentially modified through additional reactor modules performing N-alkylation and arylation, deprotection, and amidation to install broad molecular diversity in short order. Continuous flow synthesis enables the safe handling of diazoalkanes at elevated temperatures, and the use of aryl alkyne dipolarphiles under catalyst free conditions...
May 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28541249/dislocation-loop-formation-by-swift-heavy-ion-irradiation-of-metals
#4
Galvin Khara, Samuel Murphy, Dorothy M Duffy
A coupled two-temperature, molecular dynamics methodology is used to simulate the structural evolution of bcc metals (Fe and W) and fcc metals (Cu and Ni) following irradiation by swift heavy ions. Electronic temperature dependent electronic specific heat capacities and electron phonon coupling strengths are used to capture the full effects of the variation in the electronic density of states. Tungsten is found to be significantly more resistant to damage than iron, due both to the higher melting temperature and the higher thermal conductivity...
May 25, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28540808/exposure-to-febrile-range-hyperthermia-potentiates-wnt-signalling-and-epithelial-mesenchymal-transition-gene-expression-in-lung-epithelium
#5
Ratnakar Potla, Mohan E Tulapurkar, Irina G Luzina, Sergei P Atamas, Ishwar S Singh, Jeffrey D Hasday
BACKGROUND: As environmental and body temperatures vary, lung epithelial cells experience temperatures significantly different from normal core temperature. Our previous studies in human lung epithelium showed that: (i) heat shock accelerates wound healing and activates profibrotic gene expression through heat shock factor-1 (HSF1); (ii) HSF1 is activated at febrile temperatures (38-41 °C) and (iii) hypothermia (32 °C) activates and hyperthermia (39.5 °C) reduces expression of a subset of miRNAs that target protein kinase-Cα (PKCα) and enhance proliferation...
April 26, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540801/umbilical-temperature-correlation-with-core-and-skin-temperatures-at-rest-in-the-heat-and-during-physical-activity
#6
Raymond J Roberge, Jung-Hyun Kim, Patrick Yorio, Aitor Coca, Yongsuk Seo, Tyler Quinn, Ali Aljaroudi, Jeffrey B Powell
PURPOSE: to determine the correlation of umbilical temperatures (Tumb) with simultaneously recorded chest wall temperature (Tchest) and rectal temperature (Trectal) in adults during rest, heat exposure and exercise. METHODS: A total of 28 healthy men, wearing different types of clothing (athletic garb, a spandex full body heating garment, firefighter bunker gear) had average and peak umbilical, chest wall and rectal temperature measurements taken during sedentary temperature stabilisation stages, heat exposure periods and active exercise phases...
April 19, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540779/planning-optimisation-and-evaluation-of-hyperthermia-treatments
#7
H P Kok, A N T J Kotte, J Crezee
BACKGROUND: Hyperthermia treatment planning using dedicated simulations of power and temperature distributions is very useful to assist in hyperthermia applications. This paper describes an advanced treatment planning software package for a wide variety of applications. METHODS: The in-house developed C++ software package Plan2Heat runs on a Linux operating system. Modules are available to perform electric field and temperature calculations for many heating techniques...
March 8, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28539048/thermochromic-ion-exchange-micelles-containing-h-chromoionophores
#8
Xinfeng Du, Changyou Zhu, Xiaojiang Xie
Thermochromic composites constitute a classical subfamily of stimuli responsive materials. We report here the thermochromic effect in Pluronic F-127 (F127) micelles containing hydrophobic ion-exchanger and H(+) chromoionophores. The highly versatile and reversible thermochromism is attributed to the temperature-induced hydration-dehydration of the peripheral layer of the micelles, which in turn controls the ion-exchange process between the core and the periphery of the micelles. The color typically changes abruptly within 3 to 5 degree Celsius and the color transition temperature can be tuned within 5 to 25 degree Celsius upon varying the F127 concentrations...
May 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28537293/formation-and-structures-of-au-rh-bimetallic-nanoclusters-supported-on-a-thin-film-of-al2o3-nial-100
#9
Po-Wei Hsu, Zhen-He Liao, Ting-Chieh Hung, Hsuan Lee, Yu-Cheng Wu, Yu-Ling Lai, Yao-Jane Hsu, Yuwei Lin, Jeng-Han Wang, Meng-Fan Luo
Self-organized alloying of Au with Rh in nanoclusters on an ordered thin film of Al2O3/NiAl(100) was investigated via various surface probe techniques under ultrahigh-vacuum conditions and calculations based on density-functional theory. The bimetallic clusters were formed on the sequential deposition of vapors of Au and Rh onto Al2O3/NiAl(100) at 300 K. The formation was more effective on the oxide seeded with Rh, since all post-deposited Au joined the pregrown Rh clusters; for metal deposition in the reverse order, some separate Rh clusters were formed...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28537269/in-situ-dynamic-tracking-of-heterogeneous-nanocatalytic-processes-by-shell-isolated-nanoparticle-enhanced-raman-spectroscopy
#10
Hua Zhang, Chen Wang, Han-Lei Sun, Gang Fu, Shu Chen, Yue-Jiao Zhang, Bing-Hui Chen, Jason R Anema, Zhi-Lin Yang, Jian-Feng Li, Zhong-Qun Tian
Surface molecular information acquired in situ from a catalytic process can greatly promote the rational design of highly efficient catalysts by revealing structure-activity relationships and reaction mechanisms. Raman spectroscopy can provide this rich structural information, but normal Raman is not sensitive enough to detect trace active species adsorbed on the surface of catalysts. Here we develop a general method for in situ monitoring of heterogeneous catalytic processes through shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) satellite nanocomposites (Au-core silica-shell nanocatalyst-satellite structures), which are stable and have extremely high surface Raman sensitivity...
May 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28535867/comparison-of-3-methods-for-preventing-perianesthetic-hypothermia-in-callimicos-callimico-goeldii
#11
Sathya K Chinnadurai, James G Johnson Iii, Jennifer N Langan
Perianesthetic hypothermia is one of the most common complications in veterinary anesthesia, especially in small patients with a large body surface area to mass ratio. During anesthesia, body heat can be lost through 4 mechanisms-radiation, convection, conduction, and evaporation-but anesthetists frequently address only one mechanism at a time. Here we sought to evaluate 3 methods of preventing perianesthetic hypothermia in callimicos (Callimico goeldii). In our experience, these small NHP routinely become hypothermic under even brief inhalant anesthesia...
May 1, 2017: Journal of the American Association for Laboratory Animal Science: JAALAS
https://www.readbyqxmd.com/read/28535352/a-hierarchical-phosphorus-nanobarbed-nanowire-hybrid%C3%AF-its-structure-and-electrochemical-properties
#12
Dan Zhao, Beibei Li, Jinying Zhang, Xin Li, Dingbin Xiao, Chengcheng Fu, Lihui Zhang, Zhihui Li, Jun Li, Daxian Cao, Chunming Niu
Nanostructured phosphorus-carbon composites are promising materials for Li-ion and Na-ion battery anodes. A hierarchical phosphorus hybrid, SiC@graphene@P, has been synthesized by chemical vapor deposition of phosphorous on the surfaces of barbed nanowires, where the barbs are vertically grown graphene nanosheets and the cores are SiC nanowires. A temperature gradient vaporization-condensation method has been used to remove the unhybridized phosphorous particles formed by homogeneous nucleation. The vertically grown barb shaped graphene nanosheets and high concentration of edge carbon atoms induced a fibrous red phosphorus (f-RP) growth with its {001} planes in parallel to {002} planes of nanographene sheets and led to a strong interpenetrated interface interaction between phosphorous and the surfaces of graphene nanosheets...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28535093/the-effects-of-crushed-ice-ingestion-prior-to-steady-state-exercise-in-the-heat
#13
Matthew Zimmermann, Grant Landers, Karen E Wallman, Jacinta Saldaris
This study examined the physiological effects of crushed ice ingestion before steady state exercise in the heat. Ten healthy males with age (23 ± 3 y), height (176.9 ± 8.7 cm), body-mass (73.5 ± 8.0 kg), VO2peak (48.5 ± 3.6 mL∙kg∙min(-1)) participated in the study. Participants completed 60 min of cycling at 55% of their VO2peak preceded by 30 min of precooling whereby 7 g∙kg(-1) of thermoneutral water (CON) or crushed ice (ICE) was ingested. The reduction in Tc at the conclusion of precooling was greater in ICE (-0...
June 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28535069/monolithic-ingaas-nanowire-array-lasers-on-silicon-on-insulator-operating-at-room-temperature
#14
Hyunseok Kim, Wook-Jae Lee, Alan Cervantes Farrell, Juan S D Morales, Pradeep Nuwan Senanayake, Sergey V Prikhodko, Tomasz Ochalski, Diana L Huffaker
Chip-scale integrated light sources are a crucial component in a broad range of photonics applications. III-V semiconductor nanowire emitters have gained attention as a fascinating approach due to their superior material properties, extremely compact size, and the capability to grow directly on lattice-mismatched silicon substrates. Although there have been remarkable advances in nanowire-based emitters, their practical applications are still in the early stages due to the difficulties in integrating nanowire emitters with photonic integrated circuits...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28535064/ten-fold-enhancement-of-inas-nanowire-photoluminescence-emission-with-an-inp-passivation-layer
#15
Pamela Jurczak, Yunyan Zhang, Jiang Wu, Ana M Sanchez, Martin Aagesen, Huiyun Liu
In this letter, we demonstrate that a significant improvement of optical performance of InAs nanowires can be achieved by capping the core InAs nanowires with a thin InP shell, which successfully passivates the surface states reducing the rate of non-radiative recombination. The improvements have been confirmed by detailed photoluminescence measurements, which showed up to ten-fold increase in the intensity of room-temperature photoluminescence from the capped InAs/InP nanowires compared to the sample with core-only InAs nanowires...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28534391/understanding-electron-transport-in-disk-shaped-triphenylene-tris-naphthaleneimidazole-s-through-structural-modification-and-theoretical-investigation
#16
Yue Zhang, David A Hanifi, M Paz Fernandez-Liencres, Liana M Klivansky, Biwu Ma, Amparo Navarro, Yi Liu
Disk-shaped molecules with large aromatic π-surface are a class of organic semiconductors of which the charge carrier transport properties could be greatly facilitated by preferred intermolecular stacking of the π-surfaces. The optical and electronic properties are not only determined by the core aromatic structure of these disk-shaped molecules, but also strongly dependent on the sidechains, which directly impact the molecular self-assembly behavior in condensed phases. Triphenylene-tris(naphthaleneimidazole) (TP-TNI) is a recently reported n-type semiconductor featuring a large π-core and branched sidechains with an electron transporting mobility reaching 10-4 cm2V-1s-1...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28533378/pyrite-sulfur-isotopes-reveal-glacial-interglacial-environmental-changes
#17
Virgil Pasquier, Pierre Sansjofre, Marina Rabineau, Sidonie Revillon, Jennifer Houghton, David A Fike
The sulfur biogeochemical cycle plays a key role in regulating Earth's surface redox through diverse abiotic and biological reactions that have distinctive stable isotopic fractionations. As such, variations in the sulfur isotopic composition (δ(34)S) of sedimentary sulfate and sulfide phases over Earth history can be used to infer substantive changes to the Earth's surface environment, including the rise of atmospheric oxygen. Such inferences assume that individual δ(34)S records reflect temporal changes in the global sulfur cycle; this assumption may be well grounded for sulfate-bearing minerals but is less well established for pyrite-based records...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533176/the-mouse-thermoregulatory-system-its-impact-on-translating-biomedical-data-to-humans
#18
REVIEW
Christopher J Gordon
The laboratory mouse has become the predominant test species in biomedical research. The number of papers that translate or extrapolate data from mouse to human has grown exponentially since the year 2000. There are many physiological and anatomical factors to consider in the process of extrapolating data from one species to another. Body temperature is, of course, a critical determinant in extrapolation because it has a direct impact on metabolism, cardiovascular function, drug efficacy, pharmacokinetics of toxins and drugs, and many other effects...
May 19, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28531316/a-comprehensive-method-to-quantify-adaptations-by-male-and-female-mice-with-hot-flashes-induced-by-the-neurokinin-b-receptor-agonist-senktide
#19
Ashley A Krull, Sarah A Larsen, Donald K Clifton, Genevieve Neal-Perry, Robert A Steiner
Vasomotor symptoms (VMS, or hot flashes) plague millions of reproductive age men and women who have natural or iatrogenic loss of sex steroid production. Many affected individuals are left without treatment options because of contraindications to hormone replacement therapy and the lack of equally effective non-hormonal alternatives. Moreover, development of safer, more effective therapies has been stymied by the lack of an animal model that recapitulates the hot flash phenomenon and enables direct testing of hypotheses regarding the pathophysiology underlying hot flashes...
May 22, 2017: Endocrinology
https://www.readbyqxmd.com/read/28531202/the-role-of-density-dependent-and-independent-processes-in-spawning-habitat-selection-by-salmon-in-an-arctic-riverscape
#20
Brock M Huntsman, Jeffrey A Falke, James W Savereide, Katrina E Bennett
Density-dependent (DD) and density-independent (DI) habitat selection is strongly linked to a species' evolutionary history. Determining the relative importance of each is necessary because declining populations are not always the result of altered DI mechanisms but can often be the result of DD via a reduced carrying capacity. We developed spatially and temporally explicit models throughout the Chena River, Alaska to predict important DI mechanisms that influence Chinook salmon spawning success. We used resource-selection functions to predict suitable spawning habitat based on geomorphic characteristics, a semi-distributed water-and-energy balance hydrologic model to generate stream flow metrics, and modeled stream temperature as a function of climatic variables...
2017: PloS One
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