分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-04-06
摘要: A robust and simple method is provided to fabricate Janus polymer/carbon nanotube (CNT) hybrid membranes for oil/water separation. Starting from CNT membranes formed by dispensing, hydrophobic poly(styrene) (PS) and hydrophilic poly(N,N-dimethylaminoethyl
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-05-02
摘要: Quantitative investigation is conducted on the resistance sources of the components in the NiOeYSZ/ YSZ/GDC/LSCFeGDC solid oxide electrolysis cell (SOEC) stack at the H2O/H2 ratios of 70/30, 80/20 and 90/ 10 at 750 C. The results indicate that the cell resistance accounts for 76.3e66.7% of that of the stack repeating unit (SRU), the contact resistance (CR) between the air electrode current-collecting layer (AECCL) and the interconnect accounts for 23.6e27.0%, the CR between the hydrogen electrode current- collecting layer (HECCL) and the interconnect only accounts for 2.3e3.2%, and the resistance of the interconnect can be neglected. Duration test of the stack is conducted at 0.8 A cm 2 for 380 h, the cell resistance increase is found to be the major contribution of the SRU degradation (82.2% of the SRU degradation) while the air electrode CR increase and the hydrogen electrode CR increase are other two important factors.
提交时间: 2017-05-02
摘要: Development of self-healing polymers with spontaneous self-healing capability and good mechanical performance is highly desired and remains a great challenge. Here, mechanical robust and self-healable supramolecular hydrogels have been fabricated by using
提交时间: 2017-05-02
摘要: A simple strategy is provided to construct a novel pH- and sugar-induced shape memory hydrogel based on dynamic phenylboronic acid [PBA]-diol interactions formed by PBA-modified sodium alginate [Alg-PBA] and poly[vinyl alcohol] [PVA]. The dynamic PBA-diol
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-05-02
摘要: A polymer-based visible and quantitative fluorometric assay for CO2 gas is constructed using branched polyethyleneimine (PEI) covalently modified with tetraphenylethylene (TPE). The sensing mechanism relies on the reaction of CO2 with alkylamines of PEI to induce the “solution-to-precipitation” phase transi- tion of the sensory polymer (TPE–PEI), thus resulting in strong aggregation-induced fluorescent emission of TPE–PEI. It works in a relatively environmental benign ethanol medium and avoids the use of toxic amine compounds with unpleasant odor. More importantly, this system is proved to be highly tolerant to possibly coexisting water, carbon monoxide, acid SO2 and H2 S gases as well as many common volatile organic compounds. These characteristics make the presently developed fluorescent chemosensor hold great potential for many real-world applications.
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-05-02
摘要: Bimetallic nanocatalysts often display enhanced physical and chemical properties compared to those of their monometallic counterparts. Herein, we introduce a simple method to fabricate an island like array of tiny Ag nanoparticles bounded on triangular Au nanoplates as the surface-enhanced Raman scattering (SERS) substrate. The surface morphology of the synthesized nanoparticles was characterized via field emission scanning electron microscopy (FE-SEM), and atomic force microscopy (AFM). Rhodamine 6G (R6G) is used as a model analyte to evaluate the performance of the tiny Ag nanoparticle bounded triangular Au nanoplates as a SERS-active substrate and validate the SERS effect. The fabricated SERS substrate showed drastically enhanced intensity with a SERS enhancement factor as high as 107, which is enough to detect a single molecule, and excellent reproducibility (less than `5%) of the signal intensity. This is because of the island-like tiny Ag nanoparticle bounded triangular Au nanoplates and their large number of “hot spots”. This substrate could also be used for label-free immunoassays, biosensing, and nanoscale optical antennas and light sources.
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-05-02
摘要: Supertough biomimetic hydrogels have been fabricated through in situ synthesis and guided assembling of positively charged conjugated polymer belts by using a parent poly(2-acrylamido-2-methylpropanesulfonic acid)/poly- (acrylamide) double network (PAMPS/PAAm DN) gel template. The inter- penetrating structures of the poly(3,4-ethylenedioxythiophene) (PEDOT) belt mesh and PAMPS/PAAm host network have been confirmed by SEM, CLSM, and Raman spectroscopy. The presence of PEDOT belts improves the Young’s modulus, compressive strength, and toughness of the biomimetic (BM) hydrogels, in comparison to the parent DN gels. Cyclic tensile (300% strain) and compressive (even 90% strain) loadings demonstrate extraordinary fatigue resistance of these BM gels. Upon ten cycles, the compressive toughness remained about 1000 J m−2, which is comparable to that of articular cartilage. The internal fracture behavior and fatigue resistance of these biomimetic interpenetrating hydrogels are further investigated. These extremely tough and fatigue resistant BM hydrogels may find applications as promising substitutes for load-bearing tissues.
提交时间: 2017-05-02
摘要: High fidelity and regularity structures of nanoscale materials has opened up new opportunities for developing miniaturized devices. A simple yet robust approach of magnetic field assisted controlled evaporative self-assembly [CESA] is developed to achieve
提交时间: 2017-05-02
摘要: This study demonstrates that uniform materials of reduced graphene oxide/polydopamine composite thin film can serve as a highly sensitive and ultrafast responsive actuator driven by water gradients absorption-induced in situ formation of bilayer structures in swelling difference along the lateral uniform thin film
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-05-02
摘要: Poly(vinylidene fluoride) (PVDF) membranes have been widely applied to treat wastewater, however, the removal of toxic aromatic phenolic compounds remains a technical challenge due to the serious adsorption fouling and difficult degradation. Herein, we aimed to design a superhydrophilic PVDF membrane decorated with Au nanoparticles, which enhanced the rapid degradation of p-nitrophenol (4-NP). The superhydrophilic PVDF membrane with a micro/nano structured surface was decorated with Au nanoparticles via poly(dopamine) (PDA) as a spacer. The influences of membrane affinity (e.g. Hydrophilic Membrane (HM), micro/nano structured superhydrophilic membrane (MSiM), and micro/ nano structured superhydrophobic membrane (MSoM)) on PDA deposition and the subsequent Au decoration were comprehensively investigated. The synthesized Au nanoparticles were characterized using transmission electron microscopy (TEM) and UV-vis absorption spectra. The morphology and composition was evaluated using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Static catalytic experiments demonstrated that MSiM degraded over 90% of 4-NP in 5 minutes with a kinetic reaction rate constant of 47.84 10 2 min 1 and high stability over 6 cycles. A membrane catalytic reactor (MCR) was designed to realize the continuous catalytic degradation of 4-NP with a kinetic reaction rate constant of 7 10 2 min 1.