Carboxymethylated cellulose nanofibril(CMCNF)is an effective green dispersant to prepare well-dispersed monolayer montmorillonites(MMTs)in water,thereby facilitating the preparation of a high-performance MMT/polymer n...Carboxymethylated cellulose nanofibril(CMCNF)is an effective green dispersant to prepare well-dispersed monolayer montmorillonites(MMTs)in water,thereby facilitating the preparation of a high-performance MMT/polymer nanocomposite film.However,not enough attention has been paid to correlating the degree of substitution(DS)of CMCNFs with the mechanical and optical properties of the final nanocomposite films.In this study,a series of homogeneous monolayer MMT nanoplatelet dispersions was prepared initially using CMCNFs with different DS as a dispersant,and the as-prepared CMCNF-dispersed MMT dispersions were then mixed with sodium carboxymethyl cellulose(CMC-Na)to fabricate nacre-like nanocomposite films with different contents of MMTs through self-assembly.The layered nanostructure and optical and mechanical properties of the asprepared CMCNF-dispersed MMT/CMC-Na nanocomposite films were investigated,which demonstrated that CMCNFs with lower DS have a positive effect on their optical and mechanical properties.This study sheds light on the preparation of MMT-based nanocomposite films with superior optical and mechanical properties.展开更多
The influences of SSD on the beam characteristics in the near held are investigated. Results snow that it the SSD parameters are increased, the laser intensity modulation increases while fluence modulation decreases, ...The influences of SSD on the beam characteristics in the near held are investigated. Results snow that it the SSD parameters are increased, the laser intensity modulation increases while fluence modulation decreases, which is attributed to the temporal and spatial variation of the SSD pulse phase. The variations of intensity and fluence modulations with the SSD parameters are given. The simulation results are presented along with a method for choosing appropriate SSD parameters according to the variations and the requirements of applications.展开更多
目的观察活血散风针刺法对白内障合并高血压病患者围手术期血压的影响。方法采用前瞻性研究的方法,选取在该院接受手术治疗的100例(100眼)合并高血压病的白内障患者作为研究对象,采用随机数字表法分为观察组、对照组各50例(50眼)。对照...目的观察活血散风针刺法对白内障合并高血压病患者围手术期血压的影响。方法采用前瞻性研究的方法,选取在该院接受手术治疗的100例(100眼)合并高血压病的白内障患者作为研究对象,采用随机数字表法分为观察组、对照组各50例(50眼)。对照组根据病情予以降压治疗及常规干预,观察组在此基础上联合活血散风针刺法治疗。比较两组围术期血压、心率、镇痛与镇静评分以及手术配合度、术后并发症发生情况。结果两组患者术中各时间点平均动脉压(mean arterial pressure,MAP)、心率(heart rate,HR)均较术前有所升高(P<0.05),观察组术中各时点MAP、HR及术后2 h HR均低于对照组(P<0.05);两组患者术中各时点及术后2hVAS评分均较术前升高,且观察组均高于对照组,对照组术中各时点Ramsay镇静评分均低于术前,观察组各时点Ramsay镇静评分均较术前无显著改变,且观察组术中各时点及术后2 h Ramsay镇静评分均高于对照组(P<0.05);观察组手术配合度高于对照组(P<0.05);观察组术后眼压升高、前房出血、角膜水肿总发生率低于对照组(P<0.05)。结论合并高血压病的白内障患者术前予以活血散风针刺法治疗,可有助于维持围手术期血压和心率稳定,提高患者手术配合度,减少术后并发症。展开更多
The dissolution of collagen in ionic liquids(ILs)was highly dependent on the polarity of ILs,which was influenced by their sorts and concentrations.Herein,the solubility and dispersion degree of collagen in two sorts ...The dissolution of collagen in ionic liquids(ILs)was highly dependent on the polarity of ILs,which was influenced by their sorts and concentrations.Herein,the solubility and dispersion degree of collagen in two sorts of ILs,namely 1-ethyl-methylimidazolium tetrafluoroborate([EMIM][BF4])with low polarity and 1-ethyl-3-methylimidazolium acetate([EMIM][Ac])with high polarity in a concentration range from 10% to 70% at 10℃ were investigated.When 150 mg of collagen was added to 30 mg of ILs,the minimum soluble collagen concentration was 0.02 mg/mL in 70%[EMIM][BF4]with lowest polarity and the maximum was 3.57 mg/mL in 70%[EMIM][Ac]with highest polarity,which indicates that soluble collagen and insoluble collagen fibers were both present.For insoluble collagens,differential scanning calorimetry showed that the thermal-stability was weakened when increasing the ILs concentration and polarity,and the fiber arrangement was looser with a more uniform lyophilized structure,observed by atomic force microscopy and scanning electron microscopy.For soluble collagens,electrophoresis patterns and Fourier transform infrared spectroscopy showed that no polypeptide chain degradation occurred during dissolution,but the thermal denaturation temperature decreased by 0.26℃~7.63℃ with the increase of ILs concentrations,measured by ultra-sensitive differential scanning calorimetry.Moreover,the aggregation of collagen molecules was reduced when ILs polarity was increased as determined by fluorescence measurements and dynamic light scattering,which resulted in an increased loose fiber arrangement observed by atomic force microscopy.If the structural integrity of collagen needs to be retained,then the ILs sorts and concentrations should be considered.展开更多
基金We would like to thank for the financial support from the National Natural Science Foundation of China(21978103)the Natural Science Foundation of Guangdong Province(2020B1515020021)+2 种基金the Pearl River S&T Nova Program of Guangzhou(201806010141)the Foundation of Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education/Shandong Province of China(KF201812)the Fundamental Research Funds for the Central Universities(2019MS083).
文摘Carboxymethylated cellulose nanofibril(CMCNF)is an effective green dispersant to prepare well-dispersed monolayer montmorillonites(MMTs)in water,thereby facilitating the preparation of a high-performance MMT/polymer nanocomposite film.However,not enough attention has been paid to correlating the degree of substitution(DS)of CMCNFs with the mechanical and optical properties of the final nanocomposite films.In this study,a series of homogeneous monolayer MMT nanoplatelet dispersions was prepared initially using CMCNFs with different DS as a dispersant,and the as-prepared CMCNF-dispersed MMT dispersions were then mixed with sodium carboxymethyl cellulose(CMC-Na)to fabricate nacre-like nanocomposite films with different contents of MMTs through self-assembly.The layered nanostructure and optical and mechanical properties of the asprepared CMCNF-dispersed MMT/CMC-Na nanocomposite films were investigated,which demonstrated that CMCNFs with lower DS have a positive effect on their optical and mechanical properties.This study sheds light on the preparation of MMT-based nanocomposite films with superior optical and mechanical properties.
基金Project supported by the State Key Program of the National Natural Science Foundation of China (Grant No.61138005)the National Natural Science Foundation of China (Grant No.61008005)
文摘The influences of SSD on the beam characteristics in the near held are investigated. Results snow that it the SSD parameters are increased, the laser intensity modulation increases while fluence modulation decreases, which is attributed to the temporal and spatial variation of the SSD pulse phase. The variations of intensity and fluence modulations with the SSD parameters are given. The simulation results are presented along with a method for choosing appropriate SSD parameters according to the variations and the requirements of applications.
文摘目的观察活血散风针刺法对白内障合并高血压病患者围手术期血压的影响。方法采用前瞻性研究的方法,选取在该院接受手术治疗的100例(100眼)合并高血压病的白内障患者作为研究对象,采用随机数字表法分为观察组、对照组各50例(50眼)。对照组根据病情予以降压治疗及常规干预,观察组在此基础上联合活血散风针刺法治疗。比较两组围术期血压、心率、镇痛与镇静评分以及手术配合度、术后并发症发生情况。结果两组患者术中各时间点平均动脉压(mean arterial pressure,MAP)、心率(heart rate,HR)均较术前有所升高(P<0.05),观察组术中各时点MAP、HR及术后2 h HR均低于对照组(P<0.05);两组患者术中各时点及术后2hVAS评分均较术前升高,且观察组均高于对照组,对照组术中各时点Ramsay镇静评分均低于术前,观察组各时点Ramsay镇静评分均较术前无显著改变,且观察组术中各时点及术后2 h Ramsay镇静评分均高于对照组(P<0.05);观察组手术配合度高于对照组(P<0.05);观察组术后眼压升高、前房出血、角膜水肿总发生率低于对照组(P<0.05)。结论合并高血压病的白内障患者术前予以活血散风针刺法治疗,可有助于维持围手术期血压和心率稳定,提高患者手术配合度,减少术后并发症。
基金funded by the National Natural Science Foundation of China(Nos.21776184 and 21476147).
文摘The dissolution of collagen in ionic liquids(ILs)was highly dependent on the polarity of ILs,which was influenced by their sorts and concentrations.Herein,the solubility and dispersion degree of collagen in two sorts of ILs,namely 1-ethyl-methylimidazolium tetrafluoroborate([EMIM][BF4])with low polarity and 1-ethyl-3-methylimidazolium acetate([EMIM][Ac])with high polarity in a concentration range from 10% to 70% at 10℃ were investigated.When 150 mg of collagen was added to 30 mg of ILs,the minimum soluble collagen concentration was 0.02 mg/mL in 70%[EMIM][BF4]with lowest polarity and the maximum was 3.57 mg/mL in 70%[EMIM][Ac]with highest polarity,which indicates that soluble collagen and insoluble collagen fibers were both present.For insoluble collagens,differential scanning calorimetry showed that the thermal-stability was weakened when increasing the ILs concentration and polarity,and the fiber arrangement was looser with a more uniform lyophilized structure,observed by atomic force microscopy and scanning electron microscopy.For soluble collagens,electrophoresis patterns and Fourier transform infrared spectroscopy showed that no polypeptide chain degradation occurred during dissolution,but the thermal denaturation temperature decreased by 0.26℃~7.63℃ with the increase of ILs concentrations,measured by ultra-sensitive differential scanning calorimetry.Moreover,the aggregation of collagen molecules was reduced when ILs polarity was increased as determined by fluorescence measurements and dynamic light scattering,which resulted in an increased loose fiber arrangement observed by atomic force microscopy.If the structural integrity of collagen needs to be retained,then the ILs sorts and concentrations should be considered.
