Hongya Geng - Academia.edu (original) (raw)

Papers by Hongya Geng

Journal of Water Process Engineering

Journal of Environmental Chemical Engineering

Journal of Environmental Management

Accounts of Chemical Research, 2022

Taking connected mobile-health diagnostics of infectious diseases to the field. Nature 2019, 566,... more Taking connected mobile-health diagnostics of infectious diseases to the field. Nature 2019, 566, 467-474. 1 This work discussed how the integration of mobile devices and internet promote the efficiency of the health systems by improving diagnosis, case tracking, patients' access to treatment/advice, and control of infectious diseases.

Environmental Pollution, 2021

Nano metal oxide particles (NMOPs) are widely used in daily life because of their superior perfor... more Nano metal oxide particles (NMOPs) are widely used in daily life because of their superior performance, and inevitably enter the sewage treatment system. Pollutants in sewage are adsorbed and degraded in wastewater treatment plants (WWTPs) depending on the microbial aggregates of activated sludge system to achieve sewage purification. NMOPs may cause ecotoxicity to the microbial community and metabolism due to their complex chemical behavior, resulting in a potential threat to the safe and steady operation of activated sludge system. It is of great significance to clarify the influencing mechanism of NMOPs on activated sludge system and reduce the risk of WWTPs. Herein, we first introduce the physicochemical behavior of six typical engineering NMOPs including ZnO, TiO2, CuO, CeO2, MgO, and MnO2 in water environment, then highlight the principal mechanisms of NMOPs for activated sludge system. In particular, the performance recovery mechanisms of activated sludge systems in the presence of NMOPs and their future development trends are well documented and discussed extensively. This review can provide a theoretical guidance and technical support for predicting and evaluating the potential threat of NMOPs on activated sludge systems, and promoting the establishment of effective control strategies and performance recovery measures of biological wastewater treatment process under the stress of NMOPs.

Journal of Materials Chemistry A, 2020

Design of biomimetic two-dimensional graphene derivatives to suppress ice crystal growth.

Materials Horizons, 2020

Efficient solar anti-icing/deicing polydimethylsiloxane/reduced graphene oxide (HPG) films with s... more Efficient solar anti-icing/deicing polydimethylsiloxane/reduced graphene oxide (HPG) films with superior sunlight harvesting performances and high deicing efficiencies have been reported here.

The Journal of Physical Chemistry Letters, 2019

Although it is crucial to the formation of cirrus clouds and consequently the climate on Earth, t... more Although it is crucial to the formation of cirrus clouds and consequently the climate on Earth, the unambiguous effect of carbonaceous materials (CM) on ice nucleation remains to be unveiled as the chemical variation on the surface of CM is always complicated by the change in morphology. Here, we separately investigate the effects of the surface chemistry and morphology of CM on ice nucleation by studying ice nucleation on highly oriented pyrolytic graphite surfaces treated with different types of plasmas. We discover unambiguously that increasing the density of hydroxyl groups leads to an increased activity of ice nucleation on the surface of graphene, while no observable effects are found when carboxylic groups are introduced. Analysis based on the classical nucleation theory reveals that the increase in the density of hydroxyl groups on the graphene surface results in an increased binding energy between the ice nucleus and the graphene surface, which consequently facilitates the formation of the critical ice nucleus.

$Research paper thumbnail of Directional freezing of binary colloidal suspensions: a model for size fractionation of graphene oxide$

Soft Matter, 2018

A theoretical model of a binary colloid suspension was developed by incorporating both the moving... more A theoretical model of a binary colloid suspension was developed by incorporating both the moving freezing boundary and the preferential adsorption of colloidal particles to the ice phase.

Advanced materials (Deerfield Beach, Fla.), Jan 17, 2017

Antifreeze proteins (AFPs), a type of high-efficiency but expensive and often unstable biological... more Antifreeze proteins (AFPs), a type of high-efficiency but expensive and often unstable biological antifreeze, have stimulated substantial interest in the search for synthetic mimics. However, only a few reported AFP mimics display thermal hysteresis, and general criteria for the design of AFP mimics remain unknown. Herein, oxidized quasi-carbon nitride quantum dots (OQCNs) are synthesized through an up-scalable bottom-up approach. They exhibit thermal-hysteresis activity, an ice-crystal shaping effect, and activity on ice-recrystallization inhibition. In the cryopreservation of sheep red blood cells, OQCNs improve cell recovery to more than twice that obtained by using a commercial cryoprotectant (hydroxyethyl starch) without the addition of any organic solvents. It is shown experimentally that OQCNs preferably bind onto the ice-crystal surface, which leads to the inhibition of ice-crystal growth due to the Kelvin effect. Further analysis reveals that the match of the distance betwe...

Angewandte Chemie (International ed. in English), Jan 15, 2016

We show graphene oxide (GO) greatly suppresses the growth and recrystallization of ice crystals, ... more We show graphene oxide (GO) greatly suppresses the growth and recrystallization of ice crystals, and ice crystals display a hexagonal shape in the GO dispersion. Preferred adsorption of GO on the ice crystal surface in liquid water leads to curved ice crystal surface. Therefore, the growth of ice crystal is suppressed owing to the Gibbs-Thompson effect, that is, the curved surface lowers the freezing temperature. Molecular dynamics simulation analysis reveals that oxidized groups on the basal plane of GO form more hydrogen bonds with ice in comparison with liquid water because of the honeycomb hexagonal scaffold of graphene, giving a molecular-level mechanism for controlling ice formation. Application of GO for cryopreservation shows that addition of only 0.01 wt % of GO to a culture medium greatly increases the motility (from 24.3 % to 71.3 %) of horse sperms. This work reports the control of growth of ice with GO, and opens a new avenue for the application of 2D materials.

Clinical and Experimental Immunology, 2009

Summary Primary biliary cirrhosis (PBC) is an organ-specific autoimmune liver disease characteriz... more Summary Primary biliary cirrhosis (PBC) is an organ-specific autoimmune liver disease characterized by progressive loss of intrahepatic small bile ducts. Cellular immune mechanisms involving T cell reaction are thought to be involved significantly in the pathogenesis of PBC. Recent studies have independently revealed enhanced T helper type 17 (Th17) response and weakened T regulatory cell (Treg) response in some autoimmune diseases, indicating a role of Th17/Treg imbalance in the pathogenesis of autoimmunity. This prompted us to investigate whether the Th17/Treg balance was broken in the peripheral blood of patients with PBC and, if it was, what cytokine circumstances might contribute to this imbalance. The expression of 11 Th17/Treg differentiation-related genes and serum concentrations of the corresponding cytokines in 36 patients with PBC, 28 patients with chronic hepatitis B and 28 healthy controls were measured by real-time quantitative–polymerase chain reaction and enzyme-link...

Journal of the American Chemical Society, Sep 30, 2017

The properties and functions of graphene oxide (GO)-based materials strongly depend on the latera... more The properties and functions of graphene oxide (GO)-based materials strongly depend on the lateral size and size distribution of GO nanosheets; therefore, GO and its derivatives with narrow size distributions are highly desired. Here we report the size fractionation of GO nanosheets by controlled directional freezing of GO aqueous dispersions. GO nanosheets with a narrow size distribution can be obtained by controlling the growth rate of the freezing front. This interesting phenomenon can be explained by the adsorption of GO nanosheets on the ice crystal surface in combination with the stratification of GO nanosheets at the ice growth front. Such a convenient size fractionation approach will be essential for practical applications of chemically modified graphene, including GO, reduced GO, and their assemblies or composites.