Atmospheric Pressure Alkaline Etching of MFI Zeolite Under Mild Temperature Toward Hollow Microstructure and Ultralow k Film.

Constructing a hollow structure inside zeolite is very helpful for improving its performance. Unlike the conventional alkaline etching technique usually operated at high temperature (typically 170 °C) and high pressure (autogenerated in autoclave), here, it is discovered that zeolite MFI nano-box can be achieved under mild etching conditions of atmospheric pressure and low temperature of 80 °C, making it very attractive for energy conservation and practical applications. A hollow-structure formation mechanism of protection-dissolution etching is demonstrated by characterizing MFI crystals obtained under different etching time, temperature, and etchant concentration.

Enhancing the Non-Isothermal Crystallization Kinetics of Polylactic Acid by Incorporating a Novel Nucleating Agent.

Polylactic acid (PLA) is a widely recognized biodegradable polymer. However, the slow crystallization rate of PLA restricts its practical applications. In this study, camphor leaf biochar decorated with multi-walled carbon nanotubes (C@MWCNTs) was prepared using the strong adhesive properties of polydopamine, and PLA/C@MWCNTs composites were fabricated via the casting solution method.

Preparation of Magnetic g-CN/FeO Composite and Its Application in the Separation of Catechol from Water.

Catechol has strong toxicity and deformity as well as carcinogenicity, and it is difficult to degrade naturally. Therefore, it is of great practical significance to develop efficient adsorbents to separate catechol from water quickly and effectively. In this work, g-CN/FeO magnetic nanocomposites were prepared using g-CN as the matrix by chemical co-precipitation, mixing with Fe and Fe solutions.

New cytotoxic steroids from the leaves of Clerodendrum trichotomum.

A phytochemical investigation of the leaves of Clerodendrum trichotomum led to the isolation of five new (2-6) and two known (1 and 7) steroids, whose structures and relative configurations were elucidated by comprehensive spectroscopic analysis and by comparison of their NMR data with those of related compounds. Steroids 2 and 5 exhibited moderate cytotoxicity in vitro against HeLa cell line.