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Upgrading Paper-grade Softwood Kraft Pulp to Dissolving Pulp by Cold Caustic Extraction

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Paper And Biomaterials 2016年第1期1卷 31-37页

作者： Chao Tian QingXian Miao linqiang zheng YongHao Ni China National Pulp and Paper Research Institute Beijing 100102 China Limerick Pulp and Paper Centre Department of Chemical Engineering University of New Brunswick Fredericton NB E3B 5A3 Canada Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and Technology Tianjin 300457 China College of Material Engineering Fujian Agriculture and Forestry University Fuzhou Fujian Province 350002 China

Cold caustic extraction has potential applications in the production of dissolving-grade pulps due to its ability to selectively remove hemicellulose from lignocellulosic materials. In this study,we demonstrate the conversion of paper-grade kraft pulp into dissolving pulp by a single-stage cold caustic extraction. Under the extraction conditions of 12 wt% NaOH lye,11% pulp consistency,a temperature of 35℃,and 2 h,a paper-grade softwood kraft pulp was purified to high-grade dissolving pulp with 97. 1% α-cellulose content,1. 2% pentosane content,and narrowed molecular weight distribution. The resulting extraction filtrate was concentrated by nano-filtration to obtain the hemicellulose content of 59. 0 g / L,while the permeate was a clear Na OH solution with 10. 9 wt% concentration. A process configuration was also proposed,integrating this cold caustic extraction process with existing pulp and paper production and multi-purpose utilization of the extraction filtrate.

关键词： cold caustic extraction dissolving pulp α-cellulose membrane filtration hemicellulose

Towards greener and more sustainable cellulose-based hand sanitizer products

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Journal of Bioresources and Bioproducts 2017年第2期2卷 50-54页

作者： Bo Sun Min Zhang Zhibin He linqiang zheng Jing Shen Yonghao Ni Key Laboratory of Food Nutrition and Safety(Tianjin University of Science and Technology) Ministry of EducationTianjin 300457China Department of Chemical Engineering University of New BrunswickFrederictonNew BrunswickE3B 5A3Canada Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry UniversityHarbin 150040China Tianjin Food Safety&Low Carbon Manufacturing Collaborative Innovation Center Tianjin300457China

More than 85%of the currently marketed hand sanitizer products are alcohol-based products,and the alcohol content is usually about 70%in order to be *** high alcohol content can cause dehydration,which is undesirable for sensitive skin,particularly for *** creates opportunities for the development of innovative hand sanitizer products that are free of alcohol and have green nano-cellulose-based materials as carriers for the antibacterial *** skin affinity and biocompatibility are the special features of the newly developed products,which would satisfy the need of the general public for green products.

关键词： Hand Sanitizer Alcohol-free Nano-cellulose-based Products Biocompatibility

Improving the colloidal stability of Cellulose nano-crystals by surface chemical grafting with polyacrylic acid

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Journal of Bioresources and Bioproducts 2016年第3期1卷 114-119页

作者： Dong Cheng Yangbing Wen Xingye An Xuhai Zhu Xiaojuan Cheng linqiang zheng Joseph E Nasrallah Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science&TechnologyTianjin 300457China Limerick Pulp and Paper Center University of New BrunswickFrederictonE3B 5A3Canada

Cellulose nano-crystals(CNC)can be tailored for various value-added ***,its use in aqueous systems is hampered by its limited dispersability,especially at a high CNC *** this study,the improvement of CNC colloidal stability by surface chemical grafting with polyacrylic acid(PAA)was investigated,and the zeta potential and the charge density of the chemically modified CNC were *** results showed that an acrylic dosage of 1%(based on the dry weight of CNC)was sufficient to significantly enhance the colloidal ***,after chemical grafting with PAA,showed better stability against the increase in storage time or solid content of the aqueous medium,compared with the un-modified CNC.

关键词： cellulose nano-crystals(CNC) colloidal stability acrylic acid particle size zeta potential charge density

Nanocellulosic materials:research/production activities and applications

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Journal of Bioresources and Bioproducts 2017年第2期2卷 45-49页

作者： Xingye An Dong Cheng Jing Shen Qingming Jia Zhibin He linqiang zheng Avik Khan Bo Sun Bitao Xiong Yonghao Ni Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and TechnologyTianjin 300457China Department of Chemical Engineering University of New BrunswickFrederictonNew BrunswickE3B 5A3Canada Key Laboratory of Bio-based Material Science and Technology Ministry of EducationNortheast Forestry UniversityHarbin 150040China Department of Chemical Engineering Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Food Nutrition and Safety Tianjin University of Science and TechnologyMinistry of EducationTianjin 300457China School of Science Zhejiang University of Science and TechnologyHangzhouZhejiang310023China.

Nanocelluloses have emerged as novel materials and attracted significant interest from both academia and *** can now be produced at pilot plant and pre-commercial scales,and even at commercial scales in some regions in the *** commercial applications of nanocelluloses have entered commercial stages though their full potentials are yet to be *** this short communication,the applications of these nanomaterials are high-lighted,including high-volume applications(e.g.,paper,textiles),high-value applications(e.g.,aerogels and structure materials for aerospace),and novel/emerging applications(e.g.,organic light emitting diodes,photonic films).Close collaboration between industries and the academic world would facilitate the development of commercial markets for using nanocelluloses in existing/new areas.

关键词： Nanocelluloses Nanocrystalline cellulose(NCC) Nanofibrillated cellulose(NFC) Cellulose filaments(CF) Cellulose whiskers(CW)

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浅谈总承包工程项目的设计沟通、优化和控制

安徽建筑 2008年第5期15卷 38-39页

作者：郑林强中国建材国际工程有限公司上海200063

文章通过总承包工程项目的实例,以理论与实践相结合的方式分析和总结以设计为主体的总承包单位在总承包工程项目中设计沟通、优化和控制的作用。

关键词：总承包设计沟通优化控制

环肋型悬挑桁架在某体育场钢结构罩棚中的应用

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钢结构 2019年第7期34卷 49-53页

作者：王剑文孙文波郑霖强华南理工大学建筑设计研究院广州510641 广东穗芳工程管理科技有限公司广州510600

某体育场结合建筑屋盖的连续造型,采用“环肋型悬挑桁架+外圈立体桁架约束环+端部钢拉杆+局部柱间V形支撑”的结构体系。该结构体系充分利用屋盖曲面的整体面内刚度,并在外圈设置一道立体桁架的约束环,以形成良好的整体刚度。其中,屋盖... 详细信息

某体育场结合建筑屋盖的连续造型,采用“环肋型悬挑桁架+外圈立体桁架约束环+端部钢拉杆+局部柱间V形支撑”的结构体系。该结构体系充分利用屋盖曲面的整体面内刚度,并在外圈设置一道立体桁架的约束环,以形成良好的整体刚度。其中,屋盖曲面的面内刚度由其各榀悬挑桁架上弦连续的交叉斜撑提供。屋盖钢结构体系仅通过铰接钢柱脚支承在2层混凝土楼盖上,与下部混凝土结构为相对独立受力体系,避免两者之间的不利影响。重点介绍这种结构体系的静力性能、非线性极限荷载分析及抗连续倒塌性能分析设计。

关键词：环肋型悬挑桁架立体桁架约束环非线性极限荷载分析抗连续倒塌分析

Effects of Curcumin on Neuroinflammation and the Nrf2/HO-1 Pathway in Rat Brains Following Gas Explosion

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Biomedical and Environmental Sciences 2024年第8期37卷 943-947页

作者： Xinwen Dong Yaguang Su zheng Luo Lyufei Deng Xiaofeng Han Yifang Liang Sanqiao Yao Weidong Wu Jia Cao linqiang Tian Yichun Bai Wenjie Ren Health School of Public Health Xinxiang Medical UniversityXinxiang 453003HenanChina Toxicology Research Institute PLA Army Medical UniversityChongqing 400038China Institute of Trauma and Orthopaedics Xinxiang Medical UniversityXinxiang 453003HenanChina Institutes of Health Central Plains Xinxiang Medical UniversityXinxiang 453003HenanChina

Gas explosions,a major occupational hazard in China’s coal industry,endanger the lives and health of *** explosions cause a specific type of traumatic brain injury with complex mechanisms,leading to disability and death.A study by Zhao et *** magnetic resonance imaging on 49 gas explosion survivors revealed significant damage to brain regions like the hippocampus and cerebral cortex.

关键词： damage Nrf2 cerebral

本征缺陷对锐钛矿TiO_(2)光电特性影响的第一性原理研究

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稀有金属 2022年第2期46卷 195-205页

作者：闫宇星汪帆夏文智郑帅熊琳强肖政伟曲靖师范学院化学与环境科学学院云南曲靖655011 中油(新疆)石油工程有限公司新疆克拉玛依834000 云南省建筑材料产品质量检验研究所云南昆明650106 昆明理工大学冶金与能源工程学院云南昆明650093

采用基于密度泛函理论的赝势平面波第一性原理方法,理论研究等浓度不同类型本征缺陷对锐钛矿TiO_(2)材料的光电特性的影响。通过对各体系材料键结构和态密度的计算,并结合带间电子跃迁,分析了材料的介电函数、折射率、反射率以及吸收系... 详细信息

采用基于密度泛函理论的赝势平面波第一性原理方法,理论研究等浓度不同类型本征缺陷对锐钛矿TiO_(2)材料的光电特性的影响。通过对各体系材料键结构和态密度的计算,并结合带间电子跃迁,分析了材料的介电函数、折射率、反射率以及吸收系数。计算结果表明:(1)体系中存在点缺陷会引起不同程度的晶格畸变,畸变程度与结构中Ti-O键键长以及O,Ti原子核对外层电子的约束能力强弱相关联;(2)各体系态密度组成相似,价带由O-2p轨道,导带由Ti-3d轨道贡献,氧间隙原子体系中间隙氧原子2p轨道会在体系中形成杂质能级,有利于载流子的迁移,能够提升光催化反应效率;(3)在可见光范围内,含有钛间隙原子体系与氧空位体系电化学活性较强,形成原因与氧原子、钛原子电负性强弱有关(χ_(O)>χ_(Ti))。这一研究对于改良锐钛矿TiO_(2)光催化性具有一定的理论指导作用。

关键词：锐钛矿TiO_(2) 本征缺陷光电特性第一性原理

间隙原子对ZnNb_(2)O_(6)光电特性影响的第一性原理研究

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计算物理 2021年第4期38卷 447-455页

作者：闫宇星张珏璇郑帅汪帆熊琳强曲靖师范学院化学与环境科学学院云南曲靖655011 中油(新疆)石油工程有限公司新疆克拉玛依834000 云南省建筑材料产品质量检验研究所云南昆明650106

基于密度泛函理论第一性原理,研究Zn、Nb、O间隙原子对ZnNb_(2)O_(6)体系光电特性的影响。分析显示:间隙原子对体系晶格畸变的影响与间隙原子几何尺寸有关。缺陷结构中,由于间隙原子电负性存在差异,也是产生晶格畸变的因素。光电特性分... 详细信息

基于密度泛函理论第一性原理,研究Zn、Nb、O间隙原子对ZnNb_(2)O_(6)体系光电特性的影响。分析显示:间隙原子对体系晶格畸变的影响与间隙原子几何尺寸有关。缺陷结构中,由于间隙原子电负性存在差异,也是产生晶格畸变的因素。光电特性分析显示:含有Zn、Nb间隙原子的体系表现为n型简并半导体。且Nbi表现出较强的介电效应,主要与Nb的离子势与电离能有关。Oi表现为p型简并半导体,对光电效应贡献较小。结果表明Nbi体系有良好的光电特性,在实际应用中具有较大潜力。

关键词： ZnNb_(2)O_(6) 间隙原子光电性能第一性原理