Autonomous Catalytic Nanomotors Based on 2D Magnetic Nanoplates

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Autonomous Catalytic Nanomotors Based on 2D Magnetic Nanoplates Minxiang Zeng, Dali Huang, Pingmei Wang, Daniel King, Baoliang Peng, Jianhui Luo, Qun Lei, Lecheng Zhang, Ling Wang, Abhijeet Shinde, Min Shuai, Noel A. Clark, and Zhengdong Cheng ACS Appl. Nano Mater., Just Accepted Manuscript • DOI: 10.1021/acsanm.8b02153 • Publication Date (Web): 03 Jan 2019 Downloaded from http://pubs.acs.org on January 4, 2019

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ACS Applied Nano Materials

Scheme 1. Schematic illustration of the geometrical factors that determine the self-propelled efficiency of solid nanoswimmers. For self-phoretic nanomotors, the plate shape may be advantageous to transform the surface flux to particle velocity when all particles are the same volume and the surface flux is uniform. 258x120mm (150 x 150 DPI)

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Figure 1. Preparation and characterization of PtBF platelets. (a) Schematic illustration of PtBF synthesis. (b) TEM images of polydispersed PtBF. Inset: an individual BF platelet. (c) Size distribution of PtBF with average size of 36.3 nm. (d) XPS Pt4f spectra of pristine BF and PtBF platelets. 318x170mm (150 x 150 DPI)


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Figure 2. Collective behaviors of self-propelled PtBF platelets. (a) Intrinsic diffusion constants of different nanoparticles in the absence of H2O2. (b) Diffusion enhancement of BF (black) and apparent diffusion constant of PtBF-L (blue) under different concentrations of H2O2. (c) Trajectories of PtBFs with different Pt amounts over 22 s. (d) Speed with different active particles from published works. The dimension represents the largest linear dimension of different MNMs. Inset: Microscopic image of the self-propelled motion of PtBF-L platelets. 223x167mm (150 x 150 DPI)



Figure 3. Catalytically active behaviors of PtBF to remove MB in water. (a) Demonstration of MB removal process under various conditions: PtBF platelets (A), BF platelets (B), and H2O2 without any nanoparticles (C). (b) Time-dependent UV-vis spectra of MB with/without nanoparticle catalysts in 60 s. (c) Catalytic degradation of MB with PtBF after 5 min. (d) Time-dependent UV-vis spectra of MB with PtBF under different dye concentrations. 273x152mm (150 x 150 DPI)


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Figure 4. Self-powered nanocleaners for stain removal. (a) Schematic illustration of nanoplate “washing machines” for cleaning stained fabrics. (b) Photographic images of molecule-stained fabrics before (left) and after nanocleaner treatment (right). (c) Photographic images of particle-stained fabrics before (left) and after nanocleaner treatment (right). (d) UV-Vis spectra of various fabric samples. 237x194mm (150 x 150 DPI)



Figure 5. Self-powered nanocleaners for stain removal. (a) Photographic images of PtBF (right) which maintains the magnetic property from BF nanoplates (left). (b) UV-Vis reflectance of molecule-stained fabrics at 592 nm over several staining/washing cycles. 249x100mm (150 x 150 DPI)


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Autonomous Catalytic Nanomotors Based on 2D Magnetic Nanoplates

Minxiang Zeng,a,* Dali Huang,b,c Pingmei Wang,d,e Daniel King,a Baoliang Peng,d,e Jianhui Luo,d,e Qun Lei,d,e Lecheng Zhang,a,c Ling Wang,a Abhijeet Shinde,a Min Shuai,f Noel A. Clarkf and Zhengdong Cheng a,b,c,* aArtie

McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.

bDepartment cMary

Kay O’Connor Process Safety Center, Texas A&M University, TX 77843, USA.

dResearch eKey

of Materials Science & Engineering, Texas A&M University, College Station, TX 77843, USA.

Institute of Petroleum Exploration & Development (RIPED), PetroChina, Beijing 100083, China.

Laboratory of Nano Chemistry (KLNC), CNPC, Beijing 100083, China.

fDepartment

of Physics and Soft Materials Research Center, University of Colorado, Boulder, Colorado 80309, USA.

KEYWORDS: Nanomotor; magnetic nanoplates; enhanced diffusion; catalytic nanocleaner; wastewater treatment.

ABSTRACT: Engineering the shape of nanoparticles has emerged as an effective approach for optimizing

their

physical/chemical

properties.

In

particular,

two-dimensional

(2D)

nanostructures with their high surface area/volume ratio have opened up exciting opportunities for developing advanced anisotropic materials and facilitating chemical processes that demand high levels of surface interactions. Although the great potential of lowdimensional 2D nanoswimmers has been suggested by theoretical works, very little

1



experimental study has been undertaken thus far. Here we fabricated a low-dimensional magnetic nanomotor based on discotic barium ferrite nanoplates. We demonstrated that the “fuel-to-motion” behavior and the enhanced diffusion of nanoswimmers are not limited to just 0D nanospheres or 1D nanorods, but are also applicable to 2D nanoplates. In addition, the 2D nanoswimmers showed excellent catalytic performance in removing molecular and particle stains on cloth likely due to their catalytic activity as well as active locomotion that enhanced microconvection of solution. This study validated a new self-powered nanomachine for cleaning application without any requirement of surfactants or external mechanical energy. 1. INTRODUCTION Nanoparticles (NPs) that mimic the functions and behaviors of their natural counterparts have drawn significant research interest.1-2 Particularly, the ability of active NPs that can respond to chemicals, light, ultrasound, and electric/magnetic fields have led to diverse applications such as cargo delivery,3-4 wastewater treatment,5 and DNA detectors.6 Recently, a bowl-shaped micromotor, resembling the shape of jellyfish, has been developed with the ability to dynamically control its velocity with temperature change.7 In addition, the design of a nanomotor with the unique shape and the subsequent ability to regulate fluidic dynamics may allow bottom-up design of novel nanoswimmer systems, for example, the super-diffusive nanobottle motors.8 As a crucial factor, the velocity of micro-/nanomotors (MNMs), especially at low fuel concentration (H2O2

Autonomous Catalytic Nanomotors Based on 2D Magnetic Nanoplates

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