Nitrogen-Doped Porous Carbons Derived from Triarylisocyanurate-Cored Polymers with High CO₂ Adsorption Properties

A series of N-doped porous carbon materials have been successfully prepared by using nitrogen-rich triarylisocyanurate-cored polymers as carbon precursor. The cross-linked networks explain the precursor with high carbonaceous residues in the following carbonization. The influence of KOH dosage and activation temperature on the specific surface area and nitrogen content of the resultant carbon materials is investigated in detail. Eventually, a maximum specific surface area of 2341 m² g^–1 and nitrogen content of 1.7 wt % are achieved in the resultant carbon materials. High CO₂ capacity (30.2 wt % at 273 K/1 bar and 17.2 wt % at 298 K/1 bar) is attributed to abundant microporous structures and basic sites, superior to that of the most porous carbon materials reported in the previous literature. In addition, the carbon materials also demonstrate high H₂ and CH₄ uptake (2.7 wt % at 77.3 K/1.13 bar and 3.8 wt % at 273 K/1.13 bar, respectively). The characters of easy preparation and high gas uptake capacity endow this kind of carbon material with promising applications for CH₄, H₂, and CO₂ uptake

Porosity-Enhanced Polymers from Hyper-Cross-Linked Polymer Precursors

Hyper-cross-linked polymers (HCPs) have aroused great interest because of their potential applications in adsorbing greenhouse gases and volatile organic compounds. However, the selection of raw materials and the postcontrol of the porosity of HCPs remain a challenge. Here, we developed new porosity-enhanced materials by chemically creating additional pores in polymer-based HCPs. The as-prepared material presents a high surface area (1201 m² g^–1), large microporous volume, and high chemical stability even in concentrated acid, thus demonstrating potential in gas capture and storage (CO₂: 15.31 wt % at 273 K/1.0 bar; selectivity for CO₂ against N₂: 36.6; and large adsorption capacity for six organic vapors). This method of creating additional pores in polymer-based HCPs may open doors to the creation of novel porosity-enhanced materials suitable for high-performance adsorbents

Table1_Detection of chromosomal instability using ultrasensitive chromosomal aneuploidy detection in the diagnosis of precancerous lesions of gastric cancer.docx

Background:The diagnosis of Precancerous Lesions of Gastric Cancer (PLGC) is challenging in clinical practice. We conducted a clinical study by analyzing the information of relevant chromosome copy number variations (CNV) in the TCGA database followed by the UCAD technique to evaluate the value of Chromosomal Instability (CIN) assay in the diagnosis of PLGC.Methods:Based on the screening of gastric cancer related data in TCGA database, CNV analysis was performed to explore the information of chromosome CNV related to gastric cancer. Based on the gastroscopic pathology results, 12 specimens of patients with severe atrophy were screened to analyze the paraffin specimens of gastric mucosa by UCAD technology, and to explore the influence of related factors on them.Results:The results of CNV in TCGA database suggested that chromosome 7, 8, and 17 amplification was obvious in patients with gastric cancer. UCAD results confirmed that in 12 patients with pathologic diagnosis of severe atrophy, five of them had positive results of CIN, with a positive detection rate of 41.7%, which was mainly manifested in chromosome seven and chromosome eight segments amplification. We also found that intestinalization and HP infection were less associated with CIN. And the sensitivity of CIN measurement results was significantly better than that of tumor indicators.Conclusion:The findings suggest that the diagnosis of PLGC can be aided by UCAD detection of CIN, of which Chr7 and 8 may be closely related to PLGC.</p

Hierarchically Porous Carbon Derived from PolyHIPE for Supercapacitor and Deionization Applications

Hierarchically porous carbon (HPC) materials with interconnected porous texture are produced from a porous poly­(divinylbenzene) precursor, which is synthesized by polymerizing high-internal-phase emulsions. After carbonation, the macroporous structures of the poly­(divinylbenzene) precursor are preserved and enormous micro-/mesopores via carbonation with KOH are produced, resulting in an interconnected hierarchically porous network. The prepared HPC has a maximum specific surface area of 2189 m² g^–1. The electrode materials for supercapacitors and capacitive deionization devices employing the formed HPC exhibit a high specific capacity of 88 mA h g^–1 through a voltage range of 1 V (319 F g^–1 at 1 A g^–1) and a superior electrosorption capacity of 21.3 mg g^–1 in 500 mg L^–1 NaCl solution. The excellent capacitive performance could be ascribed to the combination of high specific surface area and favorable hierarchically porous structure

Hierarchically Porous Carbons Derived from Biomasses with Excellent Microwave Absorption Performance

A variety of biomass-based carbon materials with two-level porous structure have been successfully prepared by one-step carbonization process. The first level of microscale pores templates from the inherent porous tissues, while the second one of nanopores is produced by the in situ etching by the embedded alkaline metal elements. The superimposed effect of nano and microscale pores endows the hierarchically porous carbons (HPCs) with excellent microwave absorption (MA) performance. Among them, the spinach-derived HPC exhibits a maximum reflection loss of −62.2 dB and a broad effective absorption bandwidth of 7.3 GHz. Particularly, this excellent MA performance can be reproduced using the biomass materials belonging to different families, harvested seasons, and origins, indicating a green and sustainable process. These encouraging findings shed the insights on the preparation of biomass-derived microwave absorbents with promising practical applications