Photonic Crystals with a Reversibly Inducible and Erasable Defect State Using External Stimuli

Chen, Mao; Zhang, Yapeng; Jia, Siyu; Zhou, Lin; Guan, Ying; Zhang, Yongjun

doi:10.1002/ange.201503004

Cited by 11 publications

(13 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A concentrated dispersion of azide-modified microgel, to which photoinitiator I2959 and CuSO 4 were added, was loaded into a cell consisting of a glass slide and an alkynemodified quartz slide. As previously reported, 26,27,37,38,44 the monodispersed microgel particles in the dispersion gradually self-assembled into a highly ordered crystalline structure when equilibrated at room temperature (Figure S6). As a result, the samples displayed different colors when illuminated with white light obliquely (Figure S6A).…”

Section: ■ Introductionsupporting

confidence: 79%

Layer-by-Layer Assembly of Microgel Colloidal Crystals via Photoinitiated Alkyne–Azide Click Reaction

2019

Self Cite

View full text Add to dashboard Cite

Layer-by-layer (LBL) assembly of colloidal crystals (CCs) allows for the fine control of the thickness and architecture of the resulting crystals. Various methods have been developed for the LBL assembly of CCs of hard spheres. However, these methods are inapplicable for microgel CCs owing to the softness and deformability of microgel spheres. In this study, a method was proposed for the LBL assembly of microgel CCs. To build the first monolayer, azide-modified microgel spheres were assembled into a three-dimensional (3D) CC. The first 111 plane of the 3D CC close to the substrate was then fixed in situ onto the substrate via photoinitiated alkyne–azide click reaction between the azide groups on the microgels and the alkyne groups on the substrate surface. The removal of unbonded particles resulted in a microgel monolayer with a high degree of order. The second monolayer was assembled in a similar manner, i.e., a 3D microgel CC was initially assembled followed by in situ fixation of the first 111 plane of the 3D crystal with the underlying microgel monolayer by photoinitiated alkyne–azide click reaction. For this purpose, instead of azide-modified microgel spheres, alkyne-modified microgel spheres were used for the assembly of the second layer. Confocal studies confirmed that the second monolayer was located on top of the first layer. When the lattice constant of the 3D CC approximated that of the underlying microgel monolayer, the second monolayer exhibited a high degree of order. Repeating this process led to alternating deposition of highly ordered monolayers of azide-modified and alkyne-modified microgels onto the substrate. Similar to the microgel CCs obtained by the self-assembly of microgel spheres in bulky dispersions, face-centered cubic and hexagonal-close-packed structures also coexisted in the LBL-assembled microgel CCs.

show abstract

Section: ■ Introductionsupporting

confidence: 79%

Layer-by-Layer Assembly of Microgel Colloidal Crystals via Photoinitiated Alkyne–Azide Click Reaction

2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…23−25 When inducing and erasing defect state in the doped crystals using external stimuli, the crystals are switched between two states, that is, a state with defect and a state without defect. 23 Here, a new doped microgel CC was designed. Glucose, a biological stimulus, can be used to induce and erase defect state in the crystal.…”

Section: ■ Introductionmentioning

confidence: 99%

Glucose-Induced Transition among Three States of a Doped Microgel Colloidal Crystal

et al. 2018

Self Cite

View full text Add to dashboard Cite

For the first time here, we report a colloid crystal capable of undergoing transition among three states in response to external stimuli. The colloidal crystal was assembled from poly( N-isopropylacrylamide) (PNIPAM) microgel and doped with poly( N-isopropylacrylamide- co-2-acrylamido-phenylboronic acid) (P(NIPAM-2-AAPBA)) microgel. The ordered structure was locked by in situ photopolymerization. Taking advantage of the different responses of the two microgels to external stimuli, defect state can be induced and erased reversibly. Particularly, because the dopant, that is, P(NIPAM-2-AAPBA) microgel sphere, shrinks with increasing glucose concentration, its size changes from larger than the host, that is, PNIPAM microgel sphere, to equal to the host, and finally smaller than the host. Therefore, upon addition of glucose, the crystal undergoes transition from a state with acceptor-type defect, to no defect state, and then to a state with donor-type defect. The transition among the three states is fully reversible. In addition, the response of the doped crystal to glucose is relatively fast.

show abstract

“…28,29 Moreover, the lack of simple annealing mechanisms and the resulting formation of crystals with many small domains makes a determination of the 3D crystal structure more difficult with diffraction experiments. 30,31 Here, the recent development of using soft particles as model systems [32][33][34] provides us with tools that can overcome several of these hurdles. Their weak repulsions temporarily allow particle overlap, allowing particles to overcome local energy minima and promoting crystal growth speed compared to hard spheres.…”

mentioning

confidence: 99%

Crystal-to-Crystal Transitions in Binary Mixtures of Soft Colloids

et al. 2020

View full text Add to dashboard Cite

In this article, we demonstrate a method for inducing reversible crystal-tocrystal transitions in binary mixtures of soft colloidal particles. Through a controlled decrease of salinity and increasingly dominating electrostatic interactions, a single sample is shown to reversibly organize into entropic crystals, electrostatic attraction-dominated crystals or aggregated gels, which we quantify using microscopy and image analysis. We furthermore analyze crystalline structures with bond order analysis to discern between two crystal phases. We observe the different phases using a sample holder geometry that allows both in situ salinity control and imaging through Confocal Laser Scanning Microscopy, and apply a synthesis method producing particles with high resolvability in microscopy with control over particle size. The particle softness provides for an enhanced crystallization speed, while altering the re-entrant melting behavior as compared to hard sphere systems. This work thus provides several tools for use in the reproducible manufacture and analysis of binary colloidal crystals.

show abstract

Photonic Crystals with a Reversibly Inducible and Erasable Defect State Using External Stimuli

Cited by 11 publications

References 36 publications

Layer-by-Layer Assembly of Microgel Colloidal Crystals via Photoinitiated Alkyne–Azide Click Reaction

Layer-by-Layer Assembly of Microgel Colloidal Crystals via Photoinitiated Alkyne–Azide Click Reaction

Glucose-Induced Transition among Three States of a Doped Microgel Colloidal Crystal

Crystal-to-Crystal Transitions in Binary Mixtures of Soft Colloids

Contact Info

Product

Resources

About