AIM:To optimize the preoperative diagnosis and surgical management of adult intussusception (AI). METHODS:A retrospective review of the clinical features, diagnosis, management and pathology 41 adult patients with postoperative diagnoses of intussusception was conducted. RESULTS:Forty-one patients with 44 intussusceptions were operated on, 24.4% had acute symptoms, 24.4% had subacute symptoms, and 51.2% had chronic symptoms. 70.7% of the patients presented with intestinal obstruction. There were 20 enteric, 15 ileocolic, eight colocolonic and one sigmoidorectal i n t u s s u s c e p t i o n s . 6 5 . 9 % o f i n t u s s u s c e p t i o n s were diagnosed preoperatively using a computed tomography (CT ) scan (90.5% accurate) and ultrasonography (60.0% accurate, rising to 91.7% for patients who had a palpable abdominal mass). Coloscopy located the occupying lesions of the lead point of ileocolic, colocolonic and sigmoidorectal intussusceptions. Four intussusceptions in three patients were simply reduced. Twenty-one patients underwent resection after primary reduction. There was no mortality and anastomosis leakage perioperatively. Except for one patient with multiple small bowel adenomas, which recurred 5 mo after surgery, no patients were recurrent within 6 mo.Pathologically, 54.5% of the intussusceptions had a tumor, of which 27.3% were malignant. 9.1% comprised nontumorous polyps. Four intussusceptions had a gastrojejunostomy with intestinal intubation, and four intussusceptions had no organic lesion. CONCLUSION:CT is the most effective and accurate diagnostic technique. Colonoscopy can detect most lead point lesions of non-enteric intussusceptions. Intestinal intubation should be avoided.
Rechargeable Zinc–air batteries (RZABs) have attracted much attention due to their low cost, environmental benignity, high safety, and specific energy density. The bottleneck blocking the large-scale application of RZABs is the high cost and vulnerability of noble metal (Pt, IrO2, and RuO2) electrocatalysts for the oxygen reduction reaction/oxygen evolution reaction (ORR/OER). In this work, using the fruits of glossy privet as raw material, graphenelike and defect-rich carbon sheets with N doping (GPNCS) are produced as a highly active electrocatalyst for RZABs via a nontoxic, scalable, and sustainable biomass strategy. The graphenelike and porous structure of GPNCS enables the material to possess high conductivity and specific surface area, which are beneficial for its good performance as an electrocatalyst. The synergistic effect between N-doping atoms and topological defects endows the GPNCS with remarkable ORR activity and moderate OER performance. The RZABs verify the excellent catalytic performance of GPNCS, with a low charge–discharge voltage gap that remains nearly unchanged after 1340 cycles (about 500 h) at 10 mA·cm–2. This research opens up a new avenue for the cost-effective and large-scale production of highly efficient ORR/OER electrocatalysts for the development of next-generation energy storage and conversion systems.
Zinc–air batteries (ZABs) are promising as energy storage devices owing to their high energy density and the safety of electrolytes. Construction of abundant triple‐phase boundary (TPB) effectively facilitates cathode reactions occurring at TPB. Herein, a wood‐derived integral air electrode containing Co/CoO nanoparticles and nitrogen‐doped carbonized wood (Co/CoO@NWC) is constructed with a dual catalytic function. The potential gap between oxygen reduction and evolution is shortened to 0.77 V. Liquid ZABs using Co/CoO@NWC as cathode exhibit high discharge specific capacity (800 mAh gZn−1), low charge–discharge gap (0.84 V), and long‐term cycling stability (270 h). Co/CoO@NWC also shows distinguished catalytic activity and stability in all‐solid‐state ZABs. The inherent layered porous and pipe structures of wood are well maintained in catalytically active carbon. The different hydrophilicity of carbonized wood and Co/CoO endow abundant TPBs for battery reaction. The Co/CoO located on TPB provides main active sites for oxygen reactions. The inherent pipe structures of wood carbon and the interaction between Co/CoO and NWC effectively prevent nanoparticles from aggregation. The design and preparation of this monolithic electrocatalyst contribute to the broad‐scale application of ZABs and promote the development of next‐generation biomass‐based storage devices.
Organic solid‐state luminescence materials have shown great promise in many forefront areas of modern chemistry. However, the well‐developed organic luminescent solids usually provoke a mass of synthetic steps. To better utilize their performances, the development of simple strategies for host materials is a goal of general concern. Herein, a series of highly efficient solid‐state luminescence materials are attained with aid of one‐step acidification of commercially available molecules. The mechanism demonstrates that the luminous efficiency of the solid‐state molecules is efficiently improved due to the synergy from the emergence of cation–π interaction and the formation of excimer. The cation–π interaction replaces π–π packing, leading to the formation of dimers with higher rigidity in solid state accompanied by red‐shifted emissions. Therefore, this one‐step acidification design concept will light the great passion of scientists for the fabrication of cation−π‐triggered analogous organic solid‐state luminescence materials with different colors by changing the substituents on benzene moieties.
A new strategy by manipulating the progress of triplet energy transfer (TET) is developed to realize adjustable multicolor and pure white emission. Donor phosphorescent molecules emits light when encapsulated into polyvinyl alcohol (PVA) through hydrogen bond interactions, and acceptor fluorescent molecules emits light when doped into PVA through cation-π interactions and hydrogen bond interactions. In addition, the triplet to singlet energy transfer process and mechanism are proved using the energy diagram and lifetime. The broadband emission color of the obtained composite film can be easily modulated by simply adjusting the amount and component of dyes, especially the white emission with CIE coordinates of (0.339, 0.337). This work provides a facile and versatile method for the development of multicolor and pure white-light-emitting diodes, which uses the interactions to light up luminescence properties, and can further aid in the wide development of applications for TET in various other fields.
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