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Soft and Deformable Thermoresponsive Hollow Rod-Shaped Microgels
Small ( IF 13.0 ) Pub Date : 2024-09-10 , DOI: 10.1002/smll.202401376 Fabian Hagemans 1 , Nabanita Hazra 1 , Viktoria D Lovasz 1 , Alexander J Awad 1 , Martin Frenken 1 , Andrey Babenyshev 1 , Olli-Ville Laukkanen 1, 2 , Dominik Braunmiller 1 , Walter Richtering 1 , Jérôme J Crassous 1
Small ( IF 13.0 ) Pub Date : 2024-09-10 , DOI: 10.1002/smll.202401376 Fabian Hagemans 1 , Nabanita Hazra 1 , Viktoria D Lovasz 1 , Alexander J Awad 1 , Martin Frenken 1 , Andrey Babenyshev 1 , Olli-Ville Laukkanen 1, 2 , Dominik Braunmiller 1 , Walter Richtering 1 , Jérôme J Crassous 1
Affiliation
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Depending on their aspect ratio, rod-shaped particles exhibit a much richer 2D and 3D phase behavior than their spherical counterparts, with additional nematic and smectic phases accompanied by defined orientational ordering. While the phase diagram of colloidal hard rods is extensively explored, little is known about the influence of softness in such systems, partly due to the absence of appropriate model systems. Additionally, investigating higher volume fractions for long rods is usually complicated because non-equilibrium dynamical arrest is likely to precede the formation of more defined states. This has motivated us to develop micrometric rod-like microgels with limited sedimentation that can respond to temperature and reversibly reorganize into defined phases via annealing and seeding procedures. A detailed procedure is presented for synthesizing rod-shaped hollow poly(N-isopropylacrylamide) microgels using micrometric silica rods as sacrificial templates. Their morphological characterization is conducted through a combination of microscopy and light scattering techniques, evidencing the unconstrained swelling of rod-shaped hollow microgels compared to core-shell microgel rods. Different aspects of their assembly in dispersion and at interfaces are further tested to illustrate the opportunities and challenges offered by such systems that combine softness, anisotropy, and thermoresponsivity.
中文翻译：
柔软且可变形的热响应空心棒状微凝胶
根据它们的纵横比，棒状颗粒表现出比球形颗粒更丰富的 2D 和 3D 相行为，额外的向列相和 smectic 相伴随着定义的取向顺序。虽然对胶体硬棒的相图进行了广泛的探索，但对软度在此类系统中的影响知之甚少，部分原因是缺乏合适的模型系统。此外，研究长杆的较高体积分数通常很复杂，因为非平衡动力学停滞可能在形成更明确的状态之前。这促使我们开发具有有限沉淀的微米杆状微凝胶，它可以响应温度并通过退火和晶种程序可逆地重组成确定的相。提出了使用微米二氧化硅棒作为牺牲模板合成棒状空心聚（N-异丙基丙烯酰胺）微凝胶的详细程序。它们的形态学表征是通过显微镜和光散射技术的组合进行的，证明了与核壳微凝胶棒相比，杆状空心微凝胶的膨胀不受限制。进一步测试了它们在分散和 AT 界面中组装的不同方面，以说明这种结合了柔软性、各向异性和热响应性的系统所带来的机遇和挑战。
更新日期：2024-09-10
中文翻译：
柔软且可变形的热响应空心棒状微凝胶
根据它们的纵横比，棒状颗粒表现出比球形颗粒更丰富的 2D 和 3D 相行为，额外的向列相和 smectic 相伴随着定义的取向顺序。虽然对胶体硬棒的相图进行了广泛的探索，但对软度在此类系统中的影响知之甚少，部分原因是缺乏合适的模型系统。此外，研究长杆的较高体积分数通常很复杂，因为非平衡动力学停滞可能在形成更明确的状态之前。这促使我们开发具有有限沉淀的微米杆状微凝胶，它可以响应温度并通过退火和晶种程序可逆地重组成确定的相。提出了使用微米二氧化硅棒作为牺牲模板合成棒状空心聚（N-异丙基丙烯酰胺）微凝胶的详细程序。它们的形态学表征是通过显微镜和光散射技术的组合进行的，证明了与核壳微凝胶棒相比，杆状空心微凝胶的膨胀不受限制。进一步测试了它们在分散和 AT 界面中组装的不同方面，以说明这种结合了柔软性、各向异性和热响应性的系统所带来的机遇和挑战。
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