A visible-light photoredox synthesis of α-amino amide or thioamide from N,N-dimethylaniline derivatives and aryl isocyanate isothiocyanate was developed. Bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III) (FIrpic) found to be the effective catalyst among six catalysts screened. The reaction involves generation α-aminoalkyl radicals tertiary amines, followed by radical addition electron-deficient carbon isothiocyanate.

This study investigates the influence of a microencapsulated Phase Change Material (mPCM) on building systems in subarctic climate which is not commonly studied for PCM applications. The mPCM incorporated into gypsum to make composite board with volume fraction 30 vt%. fabricated then used box model. model along reference built only boards are placed inside chamber where temperature regulated summer day country, large variation exists between and night. In addition, Finite Element Method...

Abstract A homogeneous visible light photoredox TEMPO‐mediated selective oxidation of primary alcohols to the corresponding carbonyl compounds was developed using molecular oxygen from air as terminal oxidant. Ru(bpy) 3 (PF 6 ) 2 (bpy: bipyridyl) and Ir(dtb‐bpy)(ppy) (dtb‐bpy: 4,4′‐di‐ tert ‐butyl‐2,2′‐bipyridyl; ppy: 2‐phenylpyridine) were used sensitizers.

Abstract Poly(ethylene terephthalate) samples with volume fraction levels of crystallinity up to 27% have been evaluated in terms physical aging, tensile mechanical properties, and environmental stress cracking failures. Specific enthalpy recovery values were found correspond transitions from ductile brittle modes failures, exhibited by each level crystallinity. For exposed aging temperatures 45 60°C, these critical enthalpies decrease linearly increased The behavior semicrystalline PET was...

The phase transition performance of the CaCl2 · 6H2O–Ca(NO3)2 4H2O composite salt system with nucleating and thickening agents was investigated in this paper. prepared by adding Ca(NO3)2 (12 wt%) to 6H2O. Different including SrCl2 6H2O, SrCO3, BaCl2, BaCO3, Na2B4O7 10H2O, H3BO3 NH4Cl were used address problems segregation supercooling phenomena during change process. results show that single agent 6H2O or mixture 2 wt% 1 BaCl2 0.5 carboxyl methyl cellulose is most suitable for system. latent...

Abstract In this work, microscopic Raman spectroscopy and component analysis were used to study a calcium nitrate solution with molar water‐to‐salt ratio (WSR) values of 4–320. The results showed that the symmetrical stretching vibration wavenumber ion ( v 1 ‐NO 3 − ) in blue shifted from 1,048 1,053 cm −1 , full width at half maximum increased 9.7 11 when WSR was reduced 320 4. first concentration region for ≥ 16.3. region, solvent‐shared pairs (SIPs) main species, contact (CIPs)...

The thermal performance of building envelopes is essential for comfort and the reduction energy requirements. Phase change materials (PCMs) implemented in can improve performance. An explicit finite element method (ex-FEM) has been developed based on a previous study to investigate heat transfer through walls with installed PCMs. For verification, we introduce an electrical circuit analogy (ECA) method. model validation, at first, COMSOL used. comparison, data were collected from experiments...

Quantum chemistry calculations were used to study the structure and energy of strontium (Sr) ion hydrated clusters [Sr(H2O)1−25]2+. The saturated hydration number first layer Sr2+ was 8, distance 2.58 Å. second had 1–9 numbers, in range 4.4–4.6 This work also developed relationship between thermodynamic data (average water binding En successive ΔEn,n−1, etc.) aforementioned low-energy structures. formed by strong electrostatic interaction molecules, decrease ΔEn,n−1 relatively large....

Diseases and complications related to catheter materials are severe problems in biomedical material applications, increasing the infection risk medical expenses. Therefore, there is an enormous demand for with antibacterial antifouling properties. Considering this, this work, we developed approach of constructing surfaces on polyurethane (PU) via surface-initiated atom transfer radical polymerization (SI-ATRP). A variety cationic polymers were grafted PU. The biocompatibility properties all...

Abstract Physical aging characteristics of poly(ethylene terephthalate) have been evaluated in relationship to volume fraction levels crystallinity up 25%. Changes the enthalpies relaxation, monitored at temperatures from 55 65°C, are found give good fits with Cowie‐Ferguson model. Overall equilibrium enthalpy relaxation values decrease linearly increased crystallinity. They increase decreased temperature, providing extrapolated lower temperature results that validated terms specific heat...

The effects of compatibiliser molecular weight, temperature the first mixing zone extruder and nanoclay loading on mechanical thermal properties polymer–clay nanocomposites (PCNs) were investigated. It was found that weight compatibiliser, content have significant polyethylene–clay nanocomposites. blending high low compatibilisers allowed a more efficient interface between polymer matrix. Coupling bonding with shear in at produced an intercalated/exfoliated filler resulting enhanced PCNs.

In this paper, the corrosion behavior of 45 steel in molten HitecXL salt (1# salt) and with 3wt%MgCl2 (2# at 773.15K is studied by gravimetric methods. The cross section characteristics, elements distribution features products samples after are analyzed SEM, XRD EDS. results show that kinetics curves for 84 h 1# 2# all obey linear law. morphology layer depths about 10μm 25μ, respectively. Cl− react O2 dissolved salts to form Cl2.then, Cl2 can Fe or oxides FeCl3, which make have bigger rate...

Abstract [B 4 O 5 (OH) 2− ] is a representative borate anion with double six‐membered ring structure, but there limited knowledge about the hydrolysis mechanisms of ]. Density functional theory‐based calculations show that tetraborate ion undergoes three‐step to form [B(OH) − and an intermediate, 3 2 6 Other new structures, such as linear trimer, branched tetraborate, analogous are observed, they not stable in neutral systems change structures. hydrolyzes last two steps. The structure...

The dependence of Young’s modulus on temperature and clay content polyethylene/clay nanocomposites (PCN) wood/polymer/clay (WPCN) is investigated. It found that the moduli PCN WPCN vary linearly with within 25 80 ° C. addition nanoclay in presence a maleic anhydride grafted polyethylene (MAPE) compatibilizer blend results an increase strength composites. decrease temperature.

To understand the influence of PCM wall configurations on thermal performance building envelopes, an explicit finite element model heat transfer from indoor to outdoor (or vice versa) is developed. The accuracy this first validated against electrical circuit analogy model, and then compared with experimental data measured in a Hot-Box device. A good agreement between simulation results obtained. study show that configuration layer sequence significantly will affect envelopes FEM developed...

Abstract The energy use of buildings is almost one-third the global final use. Phase change Materials (PCMs) are substances that undergo phase transition when surrounding temperature reaches their temperature. PCMs reported to be a good candidate as thermal storage buffer in building systems. Accordingly, may able regulate indoor while using less and thereby contributing improving performance building. In this project trail analyse effect was carried out, an experimental set-up, climate...