论文标题
外力场下的自动吸引性半灵性聚合物
Self-attractive semiflexible polymers under an external force field
论文作者
论文摘要
通过不同的刚度和自我相互作用强度来研究束缚的半融合聚合物与自动相互作用并受到外部力场的动力响应。该链被限制在两个空间维度中，并与布朗多颗粒碰撞方法描述的热浴接触。对于强大的自我吸引，平衡构象的范围从紧凑的结构到双链链，再到增加刚度时的杆。在较小的刚性下，在外部磁场下，最初的封闭式链条在完全伸长之前被力不断解开。对于双链构象，从折叠状态到开放状态的过渡对于较大的刚度更陡峭。过渡中的不连续性出现在延伸性关系以及回旋半径的概率分布函数中。发现相对于沿法向方向的平衡情况相对的相对变形被发现腐烂是施加力的倒数。
The dynamical response of a tethered semiflexible polymer with self-attractive interactions and subjected to an external force field is numerically investigated by varying stiffness and self-interaction strength. The chain is confined in two spatial dimensions and placed in contact with a heat bath described by the Brownian multiparticle collision method. For strong self-attraction the equilibrium conformations range from compact structures to double-stranded chains, and to rods when increasing the stiffness. Under the external field at small rigidities, the initial close-packed chain is continuously unwound by the force before being completely elongated. For double-stranded conformations the transition from the folded state to the open one is sharp being steeper for larger stiffnesses. The discontinuity in the transition appears in the force-extension relation as well as in the probability distribution function of the gyration radius. The relative deformation with respect to the equilibrium case along the direction normal to the force is found to decay as the inverse of the applied force.
