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Chiral Nematic Liquid Crystal Behavior of Core-Shell Hybrid Rods Consisting of Chiral Cellulose Nanocrystals Dressed with Non-chiral Conformal Polymeric Skins.
Biomacromolecules ( IF 5.5 ) Pub Date : 2020-05-04 , DOI: 10.1021/acs.biomac.0c00320 Ziyue Dong 1 , Zihan Ye 1 , Zhenkun Zhang 1 , Ke Xia 1 , Pengjiao Zhang 1
Biomacromolecules ( IF 5.5 ) Pub Date : 2020-05-04 , DOI: 10.1021/acs.biomac.0c00320 Ziyue Dong 1 , Zihan Ye 1 , Zhenkun Zhang 1 , Ke Xia 1 , Pengjiao Zhang 1
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The current work investigates how the nanoscale conformal coating layers of non-chiral polymeric materials can influence the chiral nematic liquid crystal (CLC) behaviors of the rodlike cellulose nanocrystals (CNCs), the bio-derived nanomaterials that have attracted significant attention. For this, we developed strategies to coat the CNC rods on the single-particle level with a homogeneous bioinspired polydopamine (PDA) layer, leading to well-defined core–shell CNC@PDA rods with various PDA coating thicknesses and excellent colloidal stability. Comprehensive investigation revealed that the CNC@PDA hybrid nanorods in concentrated suspensions form well-defined nematic liquid crystal phases with clear phase separation behavior that depend on the rod concentrations and ionic strengths, typical of charged rods. Most intriguingly, the nematic LC phases formed by the CNC@PDA rods with the PDA coating thickness achieved herein are indeed the perfect CLC phases, which form following the classic pathway of nucleation and coalesce of chiral tactoids and have colorful chiral fingerprints standing out from the dark suspensions. The pitches of the CLC phase increase sharply with increasing PDA coating thicknesses and are significantly larger than those of the pristine CNCs. Such observations can be attributed to the blurring effects of the PDA coating on the intrinsic surface chiral features of CNC of whatever origins that drive the formation of the CLC phases, resulting in weakening chiral interactions between CNC@PDA rods. Besides benefiting the understanding of the long-sought origin of the CLC phases of the pristine CNC, the current work demonstrates the possibility of controlling the CLC phase behaviors of CNC by tuning the thickness of the coating materials and also serves as the first example of directly transferring the unique chirality of CNC to other non-chiral materials.
中文翻译：
核心壳-壳混合棒的手性向列液晶行为，该棒-壳手性纤维素纳米晶体由非手性共形聚合物皮包裹而成。
当前的工作研究了非手性聚合物材料的纳米级保形涂层如何影响棒状纤维素纳米晶体（CNCs）的手性向列液晶（CLC）行为，棒状纤维素纳米晶体是生物衍生的纳米材料，引起了广泛关注。为此，我们制定了在单颗粒水平上用均一的生物启发性聚多巴胺（PDA）涂层涂覆CNC棒的策略，从而形成具有各种PDA涂层厚度和出色的胶体稳定性的定义明确的核壳型CNC @ PDA棒。全面的研究表明，浓缩悬浮液中的CNC @ PDA杂化纳米棒形成了明确定义的向列型液晶相，其清晰的相分离行为取决于棒的浓度和典型带电棒的离子强度。最有趣的是 由CNC @ PDA棒形成的向列LC相具有此处获得的PDA涂层厚度，的确是完美的CLC相，它遵循经典的成核和手性触手成核和聚结途径形成，并具有从深色悬浮液中突出的彩色手性指纹。CLC相的间距随着PDA涂层厚度的增加而急剧增加，并且明显大于原始CNC的间距。这些观察结果可归因于PDA涂层对CNC固有表面手性特征的模糊作用，而这种固有手性特征是由哪些来源导致CLC相形成的，从而削弱了CNC @ PDA杆之间的手性相互作用。除了有助于了解原始CNC的CLC相的长期需求之外，
更新日期：2020-05-04
中文翻译：
核心壳-壳混合棒的手性向列液晶行为，该棒-壳手性纤维素纳米晶体由非手性共形聚合物皮包裹而成。
当前的工作研究了非手性聚合物材料的纳米级保形涂层如何影响棒状纤维素纳米晶体（CNCs）的手性向列液晶（CLC）行为，棒状纤维素纳米晶体是生物衍生的纳米材料，引起了广泛关注。为此，我们制定了在单颗粒水平上用均一的生物启发性聚多巴胺（PDA）涂层涂覆CNC棒的策略，从而形成具有各种PDA涂层厚度和出色的胶体稳定性的定义明确的核壳型CNC @ PDA棒。全面的研究表明，浓缩悬浮液中的CNC @ PDA杂化纳米棒形成了明确定义的向列型液晶相，其清晰的相分离行为取决于棒的浓度和典型带电棒的离子强度。最有趣的是 由CNC @ PDA棒形成的向列LC相具有此处获得的PDA涂层厚度，的确是完美的CLC相，它遵循经典的成核和手性触手成核和聚结途径形成，并具有从深色悬浮液中突出的彩色手性指纹。CLC相的间距随着PDA涂层厚度的增加而急剧增加，并且明显大于原始CNC的间距。这些观察结果可归因于PDA涂层对CNC固有表面手性特征的模糊作用，而这种固有手性特征是由哪些来源导致CLC相形成的，从而削弱了CNC @ PDA杆之间的手性相互作用。除了有助于了解原始CNC的CLC相的长期需求之外，
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