Preparation of multi-walled carbon nanotubes and its application as flame retardant for polypropylene

Micro & nano letters

article

Yinlong Shen¹  Weiguang Gong¹  Yuanyuan Xu¹  Baicun Zheng¹ 

[1] Research and Development Center for Sports Materials, East China University of Science and Technology

关键词: multi-wall carbon nanotubes;    flame retardants;    filled polymers;    nickel compounds;    catalysts;    X-ray diffraction;    atomic emission spectroscopy;    transmission electron microscopy;    catalysis;    thermal stability;    nanocomposites;    nanofabrication;    multiwalled carbon nanotubes;    flame retardant;    polypropylene;    NiO catalyst;    Fe-pillared montmorillonite;    conventional impregnation method;    physicochemical properties;    Ni catalyst;    X-ray diffraction;    inductively coupled plasma-atomic emission spectrometry;    transmission electron microscopy;    organic montmorillonite;    hydrocarbons;    thermal stability;    flame retardancy;    thermogravimetry analysis;    cone data;    PP-MWCNT nanocomposite;    high degradation temperature;    heat release rate;    smoke production rate;   

DOI  :  10.1049/mnl.2015.0159

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Dear Editor, The common causes of laryngospasm after tracheal extubation, in pediatric population, include mild pre-existing upper respiratory infection, secretions, blood, noxious stimuli in a light plane of anesthesia etc. The patients desaturate rapidly during laryngospasm, which if not treated promptly, results in bradycardia and even cardiac arrest.1,2 We report a 3 year old child, weighing 15 kg who underwent cataract surgery under general anaesthesia. The induction of anaesthesia and intra-operative period were uneventful. The residual neuromuscular blockade was reversed and oropharyngeal suctioning was done before extubation. Immediately after extubation, patient had severe laryngospasm which did not respond to institution of oxygen flush. The peripheral arterial oxygen saturation started decreasing. Immediately atropine 0.3 mg was given as a preemptive measure against bradycardia. It was difficult to ventilate the patient, so 3 mg succinylcholine was given intravenously and trachea was reintubated. At this moment the pulse oximetry showed peripheral arterial oxygen saturation 2% with heart rate of 180 min-1. Within seconds oxygen saturation improved to 100% and after 15 minutes, trachea was reextubated which was uneventful. Management of laryngospasm involves removal of the irritant stimulus, jaw thrust, administration of 100% oxygen and increasing the depth of sedation by sub hypnotic dose of propofol (0.8 mg/kg). However, suxamethonium remains the gold standard for treatment of laryngospasm.2 With this case we want to highlight that it is better to manage one problem (desaturation) rather than two problems (desaturation and bradycardia) simultaneously. Administration of atropine was used as a preemptive measure against expected bradycardia. Though heart rate would have improved with improvement in oxygen saturation but administration of atropine prevented bradycardia.

【 授权许可】

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