Diffusion controlling porphyrin assembled structures

Ma, Juqing; Li, Zhan; Lin, Qiang; Zhang, Wenlong; Han, Yongsheng

doi:10.1016/j.cej.2015.08.075

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…If the attraction force dominates the assembly, molecules assemble together quickly, while they assemble slowly when the repulsion force is remarkably. Furthermore, on the basis of the reaction limited aggregation model, compacted structures are easily formed in a reaction-limited condition. − At pH 1.5, the assembly kinetics is the lowest, which leads to the formation of irregular particles with compacted structures, which agrees well with the reaction limited aggregation model (RLA).…”

Section: Results and Discussionsupporting

confidence: 68%

Competition of Major Forces Dominating the Structures of Porphyrin Assembly

Zhang

et al. 2016

Crystal Growth & Design

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Here we take the self-assembly of porphyrin molecules as an example to discover the reason for the diversity of assembled structures. The self-assembly is conducted at a range of pH conditions. Irregular, tubular, and rodlike particles are formed at pH 1.5, 6.5 and 12.5, respectively. X-ray diffraction spectra and UV absorption show that these particles have the same crystalline structures, while the packing types of molecules are different. At low pH, the molecules assemble together by end to end attachment with a J-type aggregation, forming irregular particles. This assembly is dominated by the competition of π−π interaction and repulsion force. The latter force is induced by the protonation of molecules under acid conditions. With the increase of pH, the repulsion force is attenuated and finally disappears under basic conditions. The π−π interaction becomes the major force under basic conditions, leading to a H-type aggregation via face to face attachment and forming rodlike particles. At the middle pH, the competition disturbs the symmetry of molecules assembly, forming tubular particles. Together with previous studies, we expect that the compromise between competing interactions is probably the governing rule for the diversity of assembled structures.

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Section: Results and Discussionsupporting

confidence: 68%

Competition of Major Forces Dominating the Structures of Porphyrin Assembly

Zhang

et al. 2016

Crystal Growth & Design

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“…From a view at the atom level, crystallization involves the transport of solute molecules or ions to the crystal–liquid interface followed by the integration of ions into the crystal lattice. , When the consumption of chemicals at the interface is faster than the delivery of chemicals from the bulk to the interface, an interface concentration gradient is generated, which triggers the instability of crystal growth, forming complex structures, such as dendrites. , Hence, the chemical distribution in the growth front plays a significant role in the structure evolution of materials. By regulating the reaction and diffusion rates, diverse morphologies of silver particles were synthesized in our group. − We applied this method to different materials, confirming the general role of reaction and diffusion in shaping particles. , To further develop this method, it is necessary to quantify the interface chemical dynamics, which is also vital to reveal the mechanism of the interface concentration in shaping materials toward a general approach for the rational synthesis of the material structure.…”

Section: Introductionmentioning

confidence: 88%

“…22−25 We applied this method to different materials, confirming the general role of reaction and diffusion in shaping particles. 26,27 To further develop this method, it is necessary to quantify the interface chemical dynamics, which is also vital to reveal the mechanism of the interface concentration in shaping materials toward a general approach for the rational synthesis of the material structure.…”

Section: ■ Introductionmentioning

confidence: 99%

Quantifying the Driving Force of Silver Crystallization by Chemical Potential Difference

Wang

Huang

Han

2021

Ind. Eng. Chem. Res.

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The growth of materials is directly driven by the interface environment, where mass and energy transfer occurs. To some extent, the heterogeneous interface determines the diversity of material structures. Owing to the nanoscale and time dependence of the interface environment, it is a challenging issue to describe the interface quantitatively. Here, we propose to use chemical potential difference (Δμ) to quantify the interface environment in the synthesis of silver particles. Silver particles are synthesized by an electrodeposition approach at the interface of electrodes. The interface chemical distribution, which is regulated by the reaction rate, diffusion rate, and forced convection, is quantified by the chemical potential difference. It is found that the morphologies of silver particles are closely dependent on the chemical potential difference. At a low chemical potential difference, polyhedron-like silver particles form. A high chemical potential difference leads to the formation of silver dendrites, and an extremely high value switches the growth domination to nucleation domination, forming silver nanoparticles. This study shows that the chemical potential difference is a valuable factor to quantify the interface environment, which may be used to discover the significance of the interface in energy and mass transfer.

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Silver morphology indicating the evolution of concentration heterogeneity

Liu

Chen

et al. 2018

Chemical Engineering and Processing - Process Intensification

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Diffusion controlling porphyrin assembled structures

Cited by 6 publications

References 42 publications

Competition of Major Forces Dominating the Structures of Porphyrin Assembly

Competition of Major Forces Dominating the Structures of Porphyrin Assembly

Quantifying the Driving Force of Silver Crystallization by Chemical Potential Difference

Silver morphology indicating the evolution of concentration heterogeneity

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