Size-dependent Copper Nanoparticles Supported on Carbon Nanotubes with Balanced Cu+ and Cu0 Dual Sites for the Selective Hydrogenation of Ethylene Carbonate.

Cyclic carbonate hydrogenation offers an alternative for the efficient indirect CO2 utilization. In this study, a series of carbon nanotubes (CNTs) supported xCu/CNTs catalysts with different Cu loadings were fabricated using a convenient impregnation method, and exhibited excellent catalytic activity for the hydrogenation of ethylene carbonate to methanol and ethylene glycol. The structural and physicochemical properties revealed that acid treatment of CNTs resulted in plentiful oxygen-containing functional groups, providing sufficient anchoring sites for copper species. The calcination process conducted under an inert atmosphere resulted in the formation of ternary CuO, Cu2O, and Cu composites, enhancing the metal-support interaction and facilitating the formation of balanced Cu0 and Cu+ dual sites as well as high active surface area after reduction. Contributed to the synergetic effect of balanced Cu+ and Cu0 species proved by density functional theory calculation and the electron-rich CNTs surface, the 40Cu/CNTs catalyst achieved strengthened catalytic performance with methanol yield of 83%, ethylene glycol yield of 99% at ethylene carbonate conversion of >99%, and 150 h of long-term running stability. Consequently, CNTs supported Cu serve as efficient non-silica based catalyst for ester hydrogenation.

Copper phyllosilicate-derived ultrafine copper nanoparticles with plenty of Cu0and Cu+ for the enhanced catalytic performance of ethylene carbonate hydrogenation to methanol.

The hydrogenation of CO2-derived carbonates to methanol is an alternative route for the indirect utilization of abundant C1 sources. Various Cu/SiO2catalysts with different copper loading content prepared by using an ammonia evaporation hydrothermal method are implemented to evaluate the catalytic performance of ethylene carbonate (EC) hydrogenation to methanol and ethylene glycol (EG). The Cu loading content was identified to significantly affect the Cu nanoparticles (NPs) size and metal-support interaction. Highly dispersed Cu NPs restricted and embedded in copper phyllosilicate presented a smaller average particle size than the impregnated Cu/SiO2-IM catalyst. ThexCu/SiO2catalyst with ultrafine Cu NPs showed abundant Cu-O-Si interfaces, acidic sites, and coherent Cu0and Cu+species. The 5Cu/SiO2catalyst achieved methanol yield of 76% and EG yield of 98% at EC conversion of 99%, and no obvious deactivation was observed after long-term operation. The superior catalytic performance of the 5Cu/SiO2catalyst is attributed to the synergetic effect between the appropriate Cu0surface area which provides sufficient active hydrogen, and the atomic ratio of Cu+for the polarization and activation of carbon-oxygen bonds.

Ru-regulated electronic structure CoNi-MOF nanosheets advance water electrolysis kinetics in alkaline and seawater media.

Herein, an ion-exchange strategy is utilized to greatly improve the kinetics of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by Ru-modified CoNi- 1,3,5-Benzenetricarboxylic acid (BTC)-metal organic framework nanosheets (Ru@CoNi-MOF). Due to the higher Ni active sites and lower electron transfer impedance, Ru@CoNi-MOF catalyst requires the overpotential as low as 47 and 279 mV, at a current density of 10 mA/cm2 toward HER and OER, respectively. Significantly, the mass activity of Ru@CoNi-MOF for HER and OER are 25.9 and 10.6 mA mg-1, nearly 15.2 and 8.8 times higher than that of Ni-MOF. In addition, the electrolyzer of Ru@CoNi-MOF demonstrates exceptional electrolytic performance in both KOH and seawater environment, surpasses the commercial Pt/C||IrO2 couple. Theoretical calculations prove that introducing Ru atoms in - CoNi-MOF modulates the electronic structure of Ni, optimizes adsorption energy for H* and reduces energy barrier of metal organic frameworks (MOFs). This modification significantly improves the kinetic rate of the Ru@CoNi-MOF during water splitting. Certainly, this study highlights the utilization of MOF nanosheets as advanced HER/OER electrocatalysts with immense potential, and will paves a way to develop more efficient MOFs for catalytic applications.

1,3,5-Trinitro-2,4-bis-(2-phenyl-ethen-yl)benzene.

In the title compound, C(22)H(15)N(3)O(6), the central benzene ring and one of the phenyl rings are essentially parallel to each other, making a dihedral angle of 1.35 (16)°. The dihedral angle between the two phenyl rings is 83.56 (19)°. Intra-molecular C-H⋯N and C-H⋯O hydrogen bonds occur. In the crystal, mol-ecules are linked through C-H⋯O hydrogen bonds. Furthermore, offset face-to-face π-π inter-actions with centroid-centroid distances of 3.644 (2) Šhelp to stabilize the crystal structure.

4-Methyl-3-nitro-benzaldehyde.

In the crystal structure of the title compound, C(8)H(7)NO(3), mol-ecules are linked through weak inter-molecular C-H⋯O hydrogen bonding.

Whether Orthotic Management and Exercise are Equally Effective to the Patients With Adolescent Idiopathic Scoliosis in Mainland China?: A Randomized Controlled Trial Study.

STUDY DESIGN: A prospective randomized controlled trial. OBJECTIVE: The aim of this study was to investigate the effectiveness of orthotic management versus exercise on spinal curvature, body symmetry, and quality of life. SUMMARY OF BACKGROUND DATA: A number of well-designed studies comparing conservative treatment of adolescent idiopathic scoliosis (AIS) have been conducted and the evidence becomes stronger. However, there is a lack of the information on the effectiveness of orthotic management versus exercise. METHODS: The inclusion criteria recommended by the Scoliosis Research Society (SRS) and the international Society on Scoliosis Orthopedic and Rehabilitation Treatment (SOSORT) were used during enrollment. Eligible patients were randomly assigned to either bracing group or exercise group. Patients in the bracing group were prescribed with a rigid thoracolumbosacral orthosis and requested to wear 23 h/day, while patients in the exercise group were treated with the protocol of the Scientific Exercise Approach to Scoliosis. Data regarding angle of trunk inclination, Cobb angle, shoulder balance, body image, and quality of life (QoL) were collected every 6 months. RESULTS: Twenty-four patients in the bracing group and 29 patients in the exercise group participated in this study. For the intergroup comparison, the bracing group showed better results about the correction of spinal curvature (Cobb angle at the first 12 months of intervention, P = 0.039), scores concerning QoL, especially function (P < 0.001), mental health (P < 0.001), and total score (P < 0.001), were higher than that of the exercise group. The results of body symmetry evaluation did not differ significantly between the two groups. For the intragroup comparison, parameters of spinal curvature (baseline vs. 12-month, P < 0.03 in the exercise group and P < 0.001 in the bracing group), QoL (baseline vs. 12-month, P < 0.001), and TAPS (baseline vs. 12-month, P < 0.033) significantly improved over the studied period. Shoulder balance (baseline vs. 12-month, P < 0.005) showed significant improvement only in the bracing group. CONCLUSION: Both interventions of bracing and exercise showed significant treatment effectiveness on the patients with AIS. Bracing was superior to capture corrections in parameters of spinal curvature and body symmetry, while the QoL, especially in aspect of the functional and psychological status, was significantly better in the exercise group. LEVEL OF EVIDENCE: 1.

A Case-Control Study of Body Composition, Prevalence, and Curve Severity of the Patients With Adolescent Idiopathic Scoliosis in the East Part of China.

OBJECTIVE: The purpose of the study is to investigate the characteristics of prevalence and curve severity in patients with adolescent idiopathic scoliosis (AIS) and the body composition alterations between the patients with AIS and healthy controls. METHODS: Information on the study sample was obtained from a screening database. The AIS cohort was paired with an age- and gender-matched healthy cohort. The stratification of BMI and curve severity was conducted according to the criteria developed by the US Centers for Disease Control and Prevention and the Scoliosis Research Society. The prevalence and curve severity of the patients with AIS were investigated. Multigroup comparison of body composition parameters was conducted according to BMI between the patients with AIS and healthy controls. RESULTS: A total of 1,202 patients with AIS and an age- and gender-matched cohort were recruited from local schools. The underweight cases had the highest prevalence of AIS and significantly higher Cobb angle compared with the other three BMI subgroups. Although the patients with AIS had lower body weight, body fat mass, percentage of body fat, and fat-free mass compared with healthy controls, converse results were observed in the underweight cases after stratification according to BMI. CONCLUSION: Based on the sporadic body composition of the patients with AIS observed in the current study, it is predictable that the pathophysiological alterations may be different before and after the onset of scoliosis. Well-designed human or animal studies for underweight patients would be helpful to reveal the mechanisms of pathophysiological alterations and better predict the development of AIS.