Diameter Of Microspheres Research Articles

Preparation of zwitterionic microspheres of PDMAEMA-b-PMAA by RAFT dispersion polymerization in alcohol, their pH-sensitivity in water, and self-assembly in KCl solution

Zwitterionic microspheres of poly2-(dimethylamino) ethyl methacrylate (PDMAEMA) block polymethacrylic acid (MAA) were prepared by RAFT dispersion polymerization in alcohols. 4-Cyano-4-(phenylcarbonothioylthio) pentanoic acid (CPDB) was used as the RAFT agent. 2,2′-Azobis(2,4-dimethyl) valeronitrile (V65) was used as the initiator, and PDMAEMA-CPDB was used as the macro-chain transfer agent (CTA). 1HNMR was applied to determine the polymerization degrees of both PDMAEMA-CTA and PDMAEMA-b-PMAA. SEM, dynamic light scattering (DLS), and small-angle X-ray diffraction (SAX) were employed to characterize the microspheres. It was observed that the polarity of alcohols impacted the partition of MAA and V65 between the mini-droplets of PDMAEMA-CTA/MAA complexes and the continuous phase, thereby affected on the diameters of microspheres, the total conversion of MAA, and the polymerization degree of PMAA in the copolymers. For example, in methanol, the smallest diameter and polymerization degree of PMAA in the block copolymers were obtained, whereas the total conversion of MAA of the RAFT polymerization system was the highest. Most of RAFT polymerization of MAA occurred nearby PDMAEMA-CTA chains; thus, PDMAEMA-CTA acted as a template to regulate the length of PMAA in the copolymers. pH-sensitive characteristics of microspheres were dependent to the extra length of PDMAEMA-CTA, i.e., the difference of lengths between two blocks. When the length of PMAA was too short, e.g., PDMAEMA600-b-PMAA87, or the length of PMAA was closed to that of PDMAEMA, e.g., PDMAEMA79-b-PMAA93 and PDMAEMA102-b-PMAA131, the amphoteric characteristics of microspheres disappeared. The self-assembly behavior of diblock copolymers in KCl alcohol-water solution was also determined by the extra length of PDMAEMA. Microspheres turned into nanofibers or nano-ribbons, but for PDMAEMA600-b-PMAA87, the microspheres maintained their original spheric morphology. These results indicated that the charge-screening effects of salts played the key roles in the self-assembly.

Core-shell based responsive colloidal photonic crystals for facile, rapid, visual detection of acetone

Responsive core-shell microspheres of polystyrene@poly(methyl methacrylate-ethylene glycol dimethacrylate-acrylic acid) [PS@poly(MMA-EGDMA-AA] were obtained by surfactant-free emulsion polymerization and were employed for the preparation of monolithic polystyrene-based colloidal photonic crystals (CPCs) via evaporation induced-vertical deposition method. CPCs of distinct photonic stop band (PSB), which falls in the visible light region that exhibits brilliant structural colors were obtained by tuning the diameters of the core-shell microspheres. Further, as-fabricated CPCs were used for the facile, rapid visual detection of acetone by way of reversibly tuning the PSB of the CPCs with an apparent visual color change within fraction of a second. The present study demonstrates the feasibility of PS@poly(MMA-EGDMA-AA)-based CPCs as a simple, quick and reversible sensing platform for the detection of acetone.

Effects of Electric Filed on Electrospray Process: Experimental and Simulation Study

At present, there exists a widely-held view that electric field plays an extremely important role in the electrospray process. Aimed at investigating into the effects of electric field distribution and intensity on the electrospray process and resultant microsphere diameter, a variety of necessary and relevant tests were performed in this study by inviting an auxiliary electrode ring. The three-dimensional electric fields of the electrospray system were simulated, in addition, high-speed photography was adopted to recognize the electrospray modes. The results of a series of electrospray experiments demonstrated that not only electrospray mode but also resultant microsphere diameters are influenced, to a considerable degree, by the electric field. Such simulation results were verified by above-mentioned experiments that from higher electric field intensity comes smaller microsphere diameter, due to the fission caused by the surface charge, and besides, more uniform electric field distribution produces more uniform microsphere diameter.

HYDROTHERMAL SYNTHESIS OF THE FLOWER-LIKE MoS2 NANOSHEETS MICROSPHERES AND ITS PHOTOCATALYTIC DEGRADATION OF METHYL ORANGE

The flower-like MoS2 microspheres were synthesized via a facile hydrothermal method using Na2MoO4·2H2O, C2H2O4·2H2O, SC(NH2)2 and de-ionized water as precursors. The morphology and crystal structure of the MoS2 microspheres were characterized using scanning electron microscope (SEM) and X-ray diffraction (XRD). The as-prepared MoS2 microspheres were used as a catalyst for photocatalytic degradation of methyl orange. The effect of the size of the MoS2 microspheres and catalyst dosage amount on photocatalytic activity were investigated. The results indicate that the MoS2 powder consists of the flower-like nanosheet microspheres formed by several nanosheets gathered together perpendicular to the spherical surface, and the diameter of the MoS2 microspheres decreases with increasing the concentration of oxalic acid in the precursor. The MoS2 microspheres are with hexagonal 2H-MoS2 structure and preferentially grow along the (002) plane. It is found that the best photocatalytic degradation efficiency is 79.0% within irradiation time of 120 min under MoS2 dosage amount of 1.33 g/L and methyl orange concentration of 20mg/L.

Preparation of SiO2/YPO4:Nd/SiO2 composite microspheres with near-infrared luminescence and surface functionalization

In this study, the core/shell/shell-structured SiO2/YPO4:Nd/SiO2 composite microspheres with near-infrared luminescence property were prepared by sol-gel method. The morphology and structure of the as-prepared microspheres were observed by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and infrared spectroscopy (IR). These tests show that the composite microspheres have a sandwich structure. The diameter of the core SiO2 microspheres is ~ 220 nm, the intermediate layer thickness of rare-earth phosphate is ~ 5 nm, and the outer SiO2 layer is ~ 20 nm thick. The core/shell/shell microspheres are emitted at 1063 nm in the near-infrared region, which attributes to optical transparent windows of biological tissues. Meanwhile, the interaction between the composite microspheres and bovine serum albumin (BSA) was investigated. The results showed that the composite microspheres could quench the emission intensity of BSA by binding the tryptophan residues in BSA. The synthesized core/shell/shell composite microspheres may be used as near-infrared luminescence probes in the field of biological tissue imaging.

Removal of copper ions using poly (acrylic acid-co-acrylamide) hydrogel microspheres with controllable size prepared by W/O Pickering emulsions

Poly (acrylic acid-co-acrylamide) hydrogel microspheres were prepared via Pickering emulsion polymerization with hydrophobic silica as emulsifiers. The functional groups and the morphology of the hydrogel microspheres were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy, respectively. The effect of the dosage of hydrophobic silica on Pickering emulsion polymerization was investigated, and the hydrogel microspheres with different particle sizes were used to remove copper ions in water. The results showed that the diameter (D) of the hydrogel microspheres was inversely proportional to the dosage (S) of the hydrophobic silica used. The size of the hydrogel microspheres mainly affected the adsorption equilibrium time, and the maximum adsorption capacity could reach 85 mg/g at pH = 5. The results of desorption experiment demonstrated that copper ions were adsorbed by hydrogel microspheres mainly through chemical interaction. Pickering emulsion polymerization was an efficient and environmentally friendly approach for the fabrication of granular hydrogels.

Simulation study on liquid percolation in diffusion layer of in-vitro diagnostic chips

In-vitro diagnostic chips were used to achieve point-of-care testing for its advantages including rapidity, convenience, and accuracy. Diffusion layer in multi-layer structure of in-vitro diagnostic chips integrate multiple functions, including even dispersion of the liquid and high reflectivity. However, few studies of liquid percolation in the diffusion layer have been reported. In this paper, Lattice Boltzmann Method was used to simulate the process of liquid percolation in diffusion layer of in-vitro diagnostic chips. Effects of microsphere material, microsphere diameter, and liquid type (serum or water) on percolation were investigated. The results showed that all the 3 factors had increasing degree of influence on liquid percolation in diffusion layer. Based on these simulations, it was found that a particle diameter of 4 ∼ 6 μm, liquid kinematic viscosity of 0.89 × 10−6∼1.37 × 10−6 m2/s, and microsphere contact angle of 30.5 ∼ 40.5° were conducive to controlling the percolation process in chip diffusion layer. Thus, Lattice Boltzmann Method can be nominated to explore the percolation laws in diffusion layer of in-vitro diagnostic chips. Further simulation studies should provide the basic data required for the development of multi-layer in-vitro diagnostic chips, which helps chip designers to select appropriate materials and particle diameter.

An Approach to Measuring the Point Spread Function of the Confocal Raman Microscope.

The confocal Raman microscope (CRM) is a powerful tool in analytical science. Image quality is the most important performance indicator of CRM systems. The point spread function (PSF) is one of the most useful tools to evaluate the image quality of microscopic systems. A method based on a point-like object is proposed to measure the PSF of CRM, and the size effect of spherical objects is discussed. A series of phantoms are fabricated by embedding different sizes of polystyrene microspheres into polydimethylsiloxane matrix. The diameters of microspheres are from 0.2 µm to 5 µm. The phantoms are tested by measuring the PSF of a commercial CRM whose nominal lateral resolution is about 1 µm. Results of the PSF are obtained and the accuracy of resolution is used to evaluate the size effect of the microspheres. Experimental results are well consistent with theoretical analysis. The error of the PSF can be decreased by reducing the diameter of the microsphere but meanwhile the signal-to-noise ratio (S/N) will be lowered as well. The proper diameter of microspheres is proposed in consideration of the trade-off between the S/N and the measurement error of the PSF. Results indicate that the method provides a useful approach to measurement of the PSF and the resolution of the CRM.

Enhanced magnification factors in super-resolution imaging using stacked dual microspheres

Microsphere based super-resolution imaging is a promising approach to achieve enhanced optical imaging with an ordinary optical microscope. In this study, we propose a new approach to enhance magnification factor in microsphere based super-resolution imaging. In the method, two microspheres are stacked in serial along the axial direction to implement the primary and the secondary magnifications, which is termed as stacked dual microscope (SDM) imaging. An analytical model is developed for SDM imaging, followed by the experimental investigation of several different impact factors on magnification factors M, such as microsphere diameters and separation distance between the two microspheres. The results show that the magnification factors as well as the field of view is significantly enlarged in SDM imaging, compared to the ordinary single microsphere super-resolution imaging.

Idarubicin-Loaded ONCOZENE Drug-Eluting Bead Chemoembolization in a Rabbit Liver Tumor Model: Investigating Safety, Therapeutic Efficacy, and Effects on Tumor Microenvironment

PurposeTo investigate toxicity, efficacy, and microenvironmental effects of idarubicin-loaded 40-μm and 100-μm drug-eluting embolic (DEE) transarterial chemoembolization in a rabbit liver tumor model. Materials and MethodsTwelve male New Zealand White rabbits with orthotopically implanted VX2 liver tumors were assigned to DEE chemoembolization with 40-μm (n = 5) or 100-μm (n = 4) ONCOZENE microspheres or no treatment (control; n = 3). At 24–72 hours postprocedurally, multiparametric magnetic resonance (MR) imaging including dynamic contrast-enhanced (DCE), diffusion-weighted imaging (DWI), and biosensor imaging of redundant deviation in shifts (BIRDS) was performed to assess extracellular pH (pHe), followed by immediate euthanasia. Laboratory parameters and histopathologic ex vivo analysis included fluorescence confocal microscopy and immunohistochemistry. ResultsDCE MR imaging demonstrated a similar degree of devascularization of embolized tumors for both microsphere sizes (mean arterial enhancement, 8% ± 12 vs 36% ± 51 in controls; P = .07). Similarly, DWI showed postprocedural increases in diffusion across the entire lesion (apparent diffusion coefficient, 1.89 × 10−3 mm2/s ± 0.18 vs 2.34 × 10−3 mm2/s ± 0.18 in liver; P = .002). BIRDS demonstrated profound tumor acidosis at baseline (mean pHe, 6.79 ± 0.08 in tumor vs 7.13 ± 0.08 in liver; P = .02) and after chemoembolization (6.8 ± 0.06 in tumor vs 7.1 ± 0.04 in liver; P = .007). Laboratory and ex vivo analyses showed central tumor core penetration and greater increase in liver enzymes for 40-μm vs 100-μm microspheres. Inhibition of cell proliferation, intratumoral hypoxia, and limited idarubicin elution were equally observed with both sphere sizes. ConclusionsNoninvasive multiparametric MR imaging visualized chemoembolic effects in tumor and tumor microenvironment following DEE chemoembolization. Devascularization, increased hypoxia, coagulative necrosis, tumor acidosis, and limited idarubicin elution suggest ischemia as the predominant therapeutic mechanism. Substantial size-dependent differences indicate greater toxicity with the smaller microsphere diameter.

Prepared self-growth supported copper catalyst by recovering Cu (II) from wastewater using geopolymer microspheres

Recycling metals from adsorbents is a promising strategy for utilizing metal resources with better efficiency, and improving environmental protection. In this work, NaOH-activated slag-based geopolymer microspheres (NaOH-SGS) were synthesized by the one-pot suspension solidification method. As regards Cu(II) adsorbents, their maximum adsorption capacity of 335.43 mg/g was much higher than other geopolymer materials. There are obvious changes after Cu2+ adsorption as follows. The average pore diameter of microspheres decreased from 19.91 to 10.80 nm; the pore volume increased from 0.05 to 0.27 cm3/g; the Brunauer−Emmett−Teller (BET) surface area increased from 8.23 to 91.72 m2/g; and the apparent morphology changed from gel-like layer to copper-containing nano-rods. As a result, the number of active sites for the adsorption of Cu2+ ions considerably increased. So self-growth adsorption process was named. Meanwhile the adsorbed Cu2+ species were evenly distributed on the NaOH-SGS surface. The spontaneous endothermic adsorption process which was mainly controlled by the diffusion through the external boundary layer was adequately described by the pseudo-second-order kinetic and Langmuir isotherm models. As to catalyst, the NaOH-SGS after Cu2+ adsorption (NaOH-SGS-Cu) was recycled and calcined (NaOH-SGS-Cu-calcined) to produce a supported copper catalyst that was successfully utilized to remove NO by CO. Although the optimum catalytic temperature for N2 selectivity (SN2 = 78.15%) and NO conversion (XNO = 91.96%) was a little high (350 °C), NaOH-SGS-Cu-calcined exhibits good sulfur resistance as slag contained a certain amount of sulfur. The obtained results indicated that the described method can be effectively used for copper recycling and the copper content of NaOH-SGS-Cu catalyst can be easily adjusted by varying the pH of solution, dosage, contact time, initial microsphere concentration and temperature. NaOH-SGS could be a bifunctional material (Cu2+ adsorbent and catalyst support).

Simulation of production of hollow silica particles in a plasma flow. Part 2. Hollow particle production dynamics

The paper presents the results of numerical simulation for the process of production of hollow microspheres during heating and melting of porous particles of silica (the precursor) by a flow of low-temperature plasma. This model takes into account the partial capturing of gas in the particle and offers the laws of evolution for the hollow microsphere diameter and the wall thickness for different precursors with the size D0 = (50–150) microns and porosity Pp = (0.2–0.6).

One-pot solvothermal fabrication of S-scheme OVs-Bi2O3/Bi2SiO5 microsphere heterojunctions with enhanced photocatalytic performance toward decontamination of organic pollutants

Bi2O3/Bi2SiO5 microsphere heterojunctions self-assembled by nanoplatelets with rich oxygen vacancies (OVs) were fabricated through a mild one-step solvothermal approach. The existence of OVs was confirmed by XPS and low temperature electron spin resonance (ESR) technique. The crystal texture, morphology, and optical property of the 3D OVs-Bi2O3/Bi2SiO5 microsphere heterojunctions were analyzed by a series of characterization methods. The results reveal that OVs-Bi2O3/Bi2SiO5 heterojunctions were constructed and the diameter of microspheres is about 1 μm. The photocatalytic performance of OVs-Bi2O3/Bi2SiO5 composite microspheres was assessed using methyl orange (MO) and colorless phenol as model contaminant. The synergistic effect of Bi2O3 and Bi2SiO5 greatly enhances the removal rates of organic pollutants. O2– and h+ are predominant active free radicals in the photocatalytic process, supporting by ESR, nitroblue tetrazolium (NBT) and trapping experiments. The separation and transfer of the photoinduced charge pairs of OVs- Bi2O3/Bi2SiO5 heterojunctions follow a step-scheme mechanism. The step-scheme mechanism endows OVs-Bi2O3/Bi2SiO5 heterojunctions with higher photocatalytic performance than the bare Bi2SiO5.

Improving the Supercapacitor Performance by Dispersing SiO2 Microspheres in Electrodes.

This paper describes a simple, reproducible, and scalable procedure for the preparation of a SiO2-containing supercapacitor with high cycle stability. A carbon mesoporous material (CMM) with a high specific surface area, CMK-3, was adopted as an electric double-layer capacitor (EDLC) active material for the preparation of electrodes for the supercapacitor. The optimized SiO2 content decreased as the microsphere diameter decreased, and the optimal specific capacitance was obtained with 6 wt % SiO2 microspheres (100 nm size). The capacitance improved from 133 to 298 F/g. The corresponding capacitance retention rate after 1000 cycles increased from 68.04 to 91.53%. In addition, the energy density increased from 21.05 to 26.25 Wh/kg with a current density of 1 A/g. Finally, similar results based on active carbon, CeO2/CMK-3, and graphene/CNT/MnOv composite electrodes demonstrated that the proposed method exhibits wide compatibility with diverse electrode materials.

Catalyst design of Pt/TiO2 microsphere for benzene oxidation under microwave irradiation

Pt/TiO2 microspheres with sea-urchin like structures were prepared by sequential processes including the preparation of TiO2 by a hydrothermal method and the preheating of the TiO2, the deposition of Pt nanoparticles on the TiO2 surface, followed by post heating in O2/N2 and H2. The TiO2 and Pt/TiO2 catalysts were characterized by XRD, Raman, SEM, TEM and N2 adsorption studies. The average diameter of TiO2 microspheres was about 250 nm. The TiO2 microspheres were composed of TiO2 nanoparticles with the size of 20−30 nm. Pt particles with the size of 3 nm were highly dispersed on the TiO2 microsphere by liquid phase adsorption of colloidal Pt particles. The heating of TiO2 at 300 °C before and after the Pt deposition did not change the size of TiO2 microsphere and reduced the surface area from 238 to 137 m2 g−1. The Pt/TiO2 microsphere exhibited higher catalytic activity for benzene oxidation than Pt/TiO2 P25 under normal outer heating, whereas pristine TiO2 exhibited almost no activity. Activated carbon was used as a catalyst with a mixture of Pt/TiO2 microspheres when performing the catalytic reaction under microwave heating. The mixture of Pt/TiO2 and activated carbon showed higher benzene oxidation activity under microwave irradiation than under normal external heating. The mixture was applied to benzene adsorption-catalytic oxidation combined processes.

Effect of CaCl 2 Crosslink Solution Concentration on the Characteristics of Gelatin Alginate Microspheres

Alginate as a constituent of microspheres matrix has a weakness, namely the lack of ability to slow the release of drugs from the system, causing the effects of drug therapy to the body to be less than optimal. To obtain preparations with slowed release, sodium alginate needs to be combined with other polymers such as gelatin. This study aims to determine the effect of the concentration of CaCl 2 connection solution on the characteristics of alginate-gelatin microspheres. In this study, alginate-gelatin microspheres were prepared using ionotropic gelation aerosolization techniques. Three formulas were made, each of which was replicated three times. F1 with CaCl concentration2 0.5 M, F2 with CaCl concentration2 1.0 M, F3 with a concentration of 1.5 M. The three formulas were made in the ratio of alginate-gelatin (1.5: 1)% and a crosslinking time of 1.5 hours. Evaluation of the characteristics of microspheres includes yield percentage, organoleptic, moisture content, morphology of microspheres, size and size distribution of microspheres, and swelling index. The data of this study were analyzed using one way ANNOVA. The results reveals a loss of specific uptake of the COO-manuronate alginate group and the occurrence of wave number shifts as well as an increase in the absorption intensity of the C = O group. Organoleptic examination results of alginate-gelatinin microspheres showed that microspheres of the three formulas had the same organoleptic, and formed spherical microspheres. On the inspection of swelling index, it was found that F1 and F2 reached the peak of swelling at 2 o’clock, while F3 reaches the peak of swelling at 3 o’clock. The greater the level of CaCl2, then the average diameter of microspheres will also increase, while the swelling index will decrease with increasing levels of CaCl2. In the results of moisture content examination, there is no difference in different CaCl 2.

Frequency modulation of laser ultrasound transducer using carbon nanotube-coated polyethylene microsphere.

An ultrasound transducer was fabricated by dropping a multi-walled carbon nanotube solution containing a mixture of carbon nanotubes and ethoxyethanol directly on the surface of polyethylene microspheres. The frequency modulation depended on the diameter of the polyethylene microspheres. To investigate this relationship, three types of polyethylene microspheres with different diameters were used in simulations and experiments. These specimens were attached to polydimethylsiloxane and glass plates. A comparison revealed that the 50 μm diameter polyethylene spheres coated with carbon nanotubes had the highest ultrasound frequency. This work showed that smaller polyethylene microspheres generate higher ultrasound frequencies.

Emulsion-based encapsulation of pluripotent stem cells in hydrogel microspheres for cardiac differentiation.

Cardiovascular disease is the leading cause of death worldwide, and current treatments are ineffective or unavailable to majority of patients. Engineered cardiac tissue (ECT) is a promising treatment to restore function to the damaged myocardium; however, for these treatments to become a reality, tissue fabrication must be amenable to scalable production and be used in suspension culture. Here, we have developed a low-cost and scalable emulsion-based method for producing ECT microspheres from poly(ethylene glycol) (PEG)-fibrinogen encapsulated mouse embryonic stem cells (mESCs). Cell-laden microspheres were formed via water-in-oil emulsification; encapsulation occurred by suspending the cells in hydrogel precursor solution at cell densities from 5 to 60 million cells/ml, adding to mineral oil and vortexing. Microsphere diameters ranged from 30 to 570 μm; size variability was decreased by the addition of 2% poly(ethylene glycol) diacrylate. Initial cell encapsulation density impacted the ability for mESCs to grow and differentiate, with the greatest success occurring at higher cell densities. Microspheres differentiated into dense spheroidal ECTs with spontaneous contractions occurring as early as Day 10 of cardiac differentiation; furthermore, these ECT microspheres exhibited appropriate temporal changes in gene expression and response to pharmacological stimuli. These results demonstrate the ability to use an emulsion approach to encapsulate pluripotent stem cells for use in microsphere-based cardiac differentiation.

Experimental and simulation study of flow patterns in the combined flow focusing and T-junction device

This paper presents a study of droplets generation, particularly examining different regimes or patterns of the flow by a novel device that combines two principles for droplets generation (flow focusing and T-junction (FF-TJ)) under different flow conditions, named combined FF-TJ. The study involves both experiment and simulation. From the experiment mineral oil and distilled water, three regimes (namely continuous regime, jetting regime, and squeezing regime) were found. This finding was subsequently confirmed by the simulation, which thus also gave a validation of the simulation system. The simulation was further employed to study the relationship among various parameters, including the velocities of the flows (i.e. sheath flow, middle flow, and crossflow) in the context the three regimes. We observed that the three regimes were determined by two critical values of the velocity of the middle flow, and . Interestingly, it was further found that the two critical values remained the same, independent of the velocity of the sheath flow. We further investigated the effects of the velocity ratio (the middle flow to the sheath flow, ) and the capillary number of the crossflow on the microsphere diameter. Overall, this paper presents a comprehensive study of the FF-TJ device and the associated implications for microsphere or droplet generation.

Preparation and Application of Photonic Crystal Paints with Tunable Structural Colors

A simple and fast paint drawing method is applied in fabricating patterned photonic crystals (PCs) on white paper substrates. The paints with structural colors are simply fabricated using monodispersed black disperse dye@poly(styrene–butyl acrylate–methacrylate) (P(St–BA–MAA)) microspheres via a rapid centrifugal treatment. Specifically, the centrifugal speeds and centrifugal times of dye@P(St–BA–MAA) microspheres are systematically optimized, and the apparent colors of prepared paints are simply characterized, and then the paints are used to fabricate photonic crystal patterns (PCPs) by paintbrushes. It is confirmed that the suitable paints can be prepared at 8000 rpm centrifugal speed and 30 min centrifugal time. The prepared paints display bright and iridescent structural colors, which indicates that the dye@P(St–BA–MAA) microspheres of paints undergo a certain degree of self‐assembly during the driving of centrifugal forces. The prepared paints fabricate 3D PCPs with bright and iridescent structural colors within 10–20 s. Moreover, when the diameter of microspheres decreases or the viewing angle increases, the resultant structural colors produce a blue shift according to Bragg's diffraction law. It is believed that the paints for fabricating PCPs with tunable structural colors have wide applications in painting fields.