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Supramolecular Polymerization of Hydrogen-Bonded Trimers in Bulk and Aqueous Medium

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CCS Chemistry 2024年第6期6卷 1458-1465页

作者： Freek V.de Graaf stef.A.H.Jansen Sandra M.C.Schoenmakers Bas van Genabeek Marle E.J.Vleugels Bart W.L.van den Bersselaar E.W.Meijer Ghislaine Vantomme Institute for Complex Molecular Systems Laboratory of Macromolecular and Organic ChemistryEindhoven University of Technology5600 MBEindhoven School of Chemistry and RNA Institute University of New South WalesSydneyNew South Wales 2052

Synthetic molecules that form functional noncovalent assemblies in water have received much attention for their potential applications as *** this work,we introduce a novel water-compatible monomer based on the phthalhydrazide moiety that assembles into hydrogen-bonded trimeric *** bulk,the material exhibits a cylindrical nanostructure in the liquid-crystalline phase at elevated temperatures,morphologically distinct from the crystalline lamellar *** water,these molecules effectively form cylinders in a one-dimensional fashion,yielding fibrous *** formation of these supramolecular polymers follows a cooperative mechanism,as evidenced by denaturation *** trimerized pattern represents a new category of aqueous su pramolecular polymers with future prospects for functional complex molecular systems.

关键词： noncovalent chemistry supramolecular polymers hydrogen bonding cooperativity nanostructure

DEM speedup: Stiffness effects on behavior of bulk material

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Particuology 2014年第1期12卷 107-112页

作者： stef.Lommen Dingena Schott Gabriel Lodewijks Department of Maritime and Transport Technology Delft University of Technology

A number of techniques exist for minimizing the computational cost of discrete element simulations （DEMs）. One such method is a reduction of particle stiffness, which allows for bigger time steps and therefore fewer iterations in a simulation. However, the limits and drawbacks of this approach are still unclear, and may lead to invalid results. This paper investigates the effect of a stiffness reduction on bulk behavior by examining three case studies. Two cases demonstrate that particle stiffness can be reduced without affecting the bulk material behavior, whereas the third test shows that a stiffness reduction influences the bulk behavior.

关键词： Discrete element methodSpeedupStiffness reductionLimitOverlap

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处理废水的出水采样

环保科技情报 1995年第4期 2-14页

作者： stef.,HG 范小华

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防止铸件粘砂的基本途径

国外金属加工 1995年第4期16卷 33-41页

作者： stef.,DM 曾建民

基于压力平衡原理，提出了金属向砂型表面侵渗而形成粘砂的数学模型，研究表明，毛细力是防止金属侵汉的主要力学因素，金属与造型材料之间的接触角是一个重要的参数，温度、合金成分、金属／铸型界面上的气氛构成和铸件尺寸对毛细力都... 详细信息

基于压力平衡原理，提出了金属向砂型表面侵渗而形成粘砂的数学模型，研究表明，毛细力是防止金属侵汉的主要力学因素，金属与造型材料之间的接触角是一个重要的参数，温度、合金成分、金属／铸型界面上的气氛构成和铸件尺寸对毛细力都有很大的影响。所提出了模型能解释和定量地确定铸造工艺参数如铸型紧密度，型砂ＡＦＳ粒度、型砂类型、造型材料料添加剂，金属静压力，金属的物理性质和浇注高度的作用。

关键词：铸件粘砂数学模型侵渗