NO adsorption on MoS(x) clusters: a density functional theory study

The density functional theory (DFT) method has been used to investigate NO probe molecule adsorption on the stoichiometric (Mo(16)S(32)) and nonstoichiometric (Mo(16)S(34) and Mo(16)S(29)) clusters. The calculated adsorption energies indicate that the stoichiometric cluster has stronger NO affinity than the nonstoichiometric surfaces. It is also found that mononitrosyl adsorption is favored at low NO coverage, while dinitrosyl (germinal) and (NO)(2) dimer adsorption at high NO coverage are possible. Strong repulsive interaction has been found for the adsorbed dinitrosyl and (NO)(2) dimer species. In addition, the computed NO stretching frequencies for the mononitrosyl and dinitrosyl species agree well with the experimental data, while those of the dimer species are much lower than the suggested experimental data.     

纳米Y2O3悬浮液流变性能及注浆成型研究

以比表面积为18.1 m2/g的纳米粉体Y2O3为原料,柠檬酸铵(TAC)作为分散剂制备Y2O3悬浮液,研究TAC含量、pH值、球磨时间及固相含量对Y2 O3悬浮液流变性能的影响.结果表明:加入2.2;(质量分数)的TAC,调节悬浮液的pH值为9.4～11.5,球磨8 h可以获得分散稳定的Y2 O3悬浮液;悬浮液的粘度随固相含量的增加而增大,对不同固相含量的悬浮液进行注浆成型,发现固相含量为33;(体积分数)的悬浮液致密度最高.与传统的模压成型工艺相比,注浆成型得到的坯体中粉体颗粒分散均一.     

Quality assessment of Cinnamomi Ramulus by the simultaneous analysis of multiple active components using high‐performance thin‐layer chromatography and high‐performance liquid chromatography

A novel and improved method for the quality assessment of Cinnamomi Ramulus was developed and completely validated. The method was established using fingerprint technology and simultaneous quantitative determination of six main marker compounds including coumarin, cinnamic alcohol, cinnamic acid, 2‐methoxy cinnamic acid, cinnamaldehyde, and 2‐methoxy cinnamaldehyde in the herbal medicine for the first time. A newly developed high‐performance thin‐layer chromatography method, which achieved simultaneous definition of five marker components by comparing the colors and retardation factor values of the bands in high‐performance thin‐layer chromatography, was first used for the authentication of Cinnamomi Ramulus. The fingerprints of 26 batches of herbal samples from different regions of China showed very similar chromatographic patterns that were evaluated by similarity analysis and hierarchical clustering analysis. In addition, six marker compounds were simultaneously determined using single standard to determine multiple components by the relative response factors. Compared with the external standard method, the new quantitative method was validated to determine multiple compounds in 26 batches of Cinnamomi Ramulus samples. All results demonstrated that the simple and rapid method could be effectively utilized for the quality control of Cinnamomi Ramulus.     

Creation of nanostructures with poly(methyl methacrylate)-mediated nanotransfer printing

We demonstrate here a PMMA-mediated nanotransfer printing technique for reliably transferring nanoscale building blocks and sequentially building purpose-directed nanostructures. The utilization of PMMA film as a mediator introduced several features to this transfer approach, such as high efficiency, fidelity, universality, controllability, and multilevel transferability. Various nanostructures, such as an SWNTs-on-SAM structure, high-density crossbar array of SWNTs, a hybrid n-ZnO nanowire/p-SWNT cross-junction, a gold nanostructure-SAM-gold sandwich structure, a zigzag array of SWNTs, and gold nanobowl array were generated with this transfer approach. A metallic-semiconducting SWNT cross circuit was built to demonstrate its potential application in fabricating nanoelectronic devices. This technique paves the way to generate various structures with homo- or heterogeneous nanoscale building blocks, which facilitates exploring their fundamental properties and building novel devices.     

Simple and convenient G-quadruplex-based fluorescent assay of biotin-streptavidin interaction via terminal protection of small molecule-linked DNA

Microchimica Acta - Small molecule–protein interaction plays a critical role in a majority of chemical genetics, clinical diagnostics, and drug development. Herein, by using...     

Electrospun N‐Substituted Polyurethane Membranes with Self‐Healing Ability for Self‐Cleaning and Oil/Water Separation

Membranes with special functionalities, such as self‐cleaning, especially those for oil/water separation, have attracted much attention due to their wide applications. However, they are difficult to recycle and reuse after being damaged. Herein, we put forward a new N‐substituted polyurethane membrane concept with self‐healing ability to address this challenge. The membrane obtained by electrospinning has a self‐cleaning surface with an excellent self‐healing ability. Importantly, by tuning the membrane composition, the membrane exhibits different wettability for effective separation of oil/water mixtures and water‐in‐oil emulsions, whilst still displaying a self‐healing ability and durability against damage. To the best of our knowledge, this is the first report to demonstrate a self‐healing membrane for oil/water separation, which provides the fundamental research for the development of advanced oil/water separation materials.     

Orientated-assembly of rod-like silica particles based on sandwich structure from the superhydrophobic template and the superhydrophilic substrates

The paper demonstrated a facile approach for the orientated assembly of the rod-like silica particles by sandwich structure from the combined effect of superhydrophobic template and the superhydrophilic substrates. The rod-like particles can be arranged in ring-like, square-like and etc from the confined effect of the template, which will produce an important insight for the oriented assembly of anisotropic particles and the development of the novel functional materials and devices.