Bio-inspired catalyst materials with diverse functions and excellent performance are highly demanded for efficient catalytic conversion.However,precisely imitating the natural structures to achieve optimized performan...Bio-inspired catalyst materials with diverse functions and excellent performance are highly demanded for efficient catalytic conversion.However,precisely imitating the natural structures to achieve optimized performance is still highly challenging.Inspired by the fast mass diffusion and exchange ability of alveolus structures,we prepared a hierarchically macro-meso-microporous TS-1 zeolite microsphere with a precisely designed alveolus-like structure(HAS-TS-1)by developing a method that combined template and emulsion approaches.These alveolus-like zeolite microspheres possessed interconnected macropores(280 nm)and mesopores(40 nm),with a BET surface area of 484 m^(2) g^(-1).This novel bio-inspired structure showed a significantly enhanced adsorption ability for thiophenic molecules,which was four times greater than that exhibited by a microporous TS-1 zeolite.HAS-TS-1 exhibited excellent catalytic oxidative desulfurization performance of a series of bulky thiophenic molecules,completely removing 4,6-dimethyldibenzothiophene(DMDBT)in 15 min,which was twelve times faster than that observed using a TS-1 microsphere(180 min).The superiority of this bio-inspired hierarchically alveolus-like structure in mass transfer and diffusion may enable its advanced application in the fields of catalysis,energy,and sensors.展开更多
Bone remodeling in orthodontic treatment has been one of the most concerned issues.The purpose of this study was to characterize the changes in bone remodeling on both labial and lingual aspects of the anterior teeth ...Bone remodeling in orthodontic treatment has been one of the most concerned issues.The purpose of this study was to characterize the changes in bone remodeling on both labial and lingual aspects of the anterior teeth during treatment and retention.Data of 55 extraction cases(41 females and 14 males)were collected at pretreatment,post-treatment,and follow-up stages.Bone thickness on both labial and lingual aspects of the upper and lower incisors were measured at the level of the center of resistance(UC and LC)and that of 3 mm apical to the upper and lower incisors’center of resistance(UAC and LAC).For LC,with the significant lingual movement of point LIR(center of resistance of lower incisor;P<0.001),no statistically significant changes in alveolar width on the labial aspect were detected,whereas the reduction of lingual alveolar width was statistically significant(P<0.001).In retention,no significant move-ment of point LIR appeared to occur,while an increase in alveolar width on the lingual aspect was found at this stage.For LAC,the changes in alveolar width as well as the displacement of point LIA(apex of lower incisor)were similar to those of LC.On the maxilla,with the control lingual tipping movement of upper incisor,most of the anterior alveolar changes surrounding the upper incisor were analogous to those of lower incisor.But differently,during treatment,labial bone thickness was increased significantly as the upper incisor moved lingually,and in retention,no statistically significant changes were found on both labial and lingual bone thickness as the upper incisor labially proclined.It was concluded that,with lingual movement of the incisors,bone apposition on the lingual aspect may lag behind the incisor movement.In retention,the lower incisors are in a stable position,with sequential bone apposition being presented on the lingual aspect.However,the upper incisors turn out to be labially relapsed along with the lingual bone resorption and labial bone apposition occurring simultaneously.展开更多
基金financially supported by the National Key R&D Program of China(2022YFB3504000)National Natural Science Foundation of China(22293022,U22B6011,22402155)+5 种基金Program of Introducing Talents of Discipline to Universities-Plan 111(Grant No.B20002)from the Ministry of ScienceTechnology and the Ministry of Education of China,Postdoctoral Fellowship Program of CPSF(GZC20232012,2023M742724)L.H.Chen acknowledges Hubei Provincial Department of Education for the“Chutian Scholar”programB.L.Su acknowledges the Clare Hall Life Membership,University of CambridgeThis research was also supported by the European Commission Interreg V France-Wallonie-Vlaanderen project“DepollutAir”,the Program Win2Wal(TCHARBONACTIF:2110120)Wallonia Region of Belgium and the National Key R&D Program Intergovernmental Technological Innovation Special Cooperation Project Wallonia-Brussels/China(MOST)(SUB/2021/IND493971/524448).
文摘Bio-inspired catalyst materials with diverse functions and excellent performance are highly demanded for efficient catalytic conversion.However,precisely imitating the natural structures to achieve optimized performance is still highly challenging.Inspired by the fast mass diffusion and exchange ability of alveolus structures,we prepared a hierarchically macro-meso-microporous TS-1 zeolite microsphere with a precisely designed alveolus-like structure(HAS-TS-1)by developing a method that combined template and emulsion approaches.These alveolus-like zeolite microspheres possessed interconnected macropores(280 nm)and mesopores(40 nm),with a BET surface area of 484 m^(2) g^(-1).This novel bio-inspired structure showed a significantly enhanced adsorption ability for thiophenic molecules,which was four times greater than that exhibited by a microporous TS-1 zeolite.HAS-TS-1 exhibited excellent catalytic oxidative desulfurization performance of a series of bulky thiophenic molecules,completely removing 4,6-dimethyldibenzothiophene(DMDBT)in 15 min,which was twelve times faster than that observed using a TS-1 microsphere(180 min).The superiority of this bio-inspired hierarchically alveolus-like structure in mass transfer and diffusion may enable its advanced application in the fields of catalysis,energy,and sensors.
基金supported by a grant from Scientific Research Foundation for Returned Overseas Chinese Scholars,Ministry of Education,China(No.[2007]1108).
文摘Bone remodeling in orthodontic treatment has been one of the most concerned issues.The purpose of this study was to characterize the changes in bone remodeling on both labial and lingual aspects of the anterior teeth during treatment and retention.Data of 55 extraction cases(41 females and 14 males)were collected at pretreatment,post-treatment,and follow-up stages.Bone thickness on both labial and lingual aspects of the upper and lower incisors were measured at the level of the center of resistance(UC and LC)and that of 3 mm apical to the upper and lower incisors’center of resistance(UAC and LAC).For LC,with the significant lingual movement of point LIR(center of resistance of lower incisor;P<0.001),no statistically significant changes in alveolar width on the labial aspect were detected,whereas the reduction of lingual alveolar width was statistically significant(P<0.001).In retention,no significant move-ment of point LIR appeared to occur,while an increase in alveolar width on the lingual aspect was found at this stage.For LAC,the changes in alveolar width as well as the displacement of point LIA(apex of lower incisor)were similar to those of LC.On the maxilla,with the control lingual tipping movement of upper incisor,most of the anterior alveolar changes surrounding the upper incisor were analogous to those of lower incisor.But differently,during treatment,labial bone thickness was increased significantly as the upper incisor moved lingually,and in retention,no statistically significant changes were found on both labial and lingual bone thickness as the upper incisor labially proclined.It was concluded that,with lingual movement of the incisors,bone apposition on the lingual aspect may lag behind the incisor movement.In retention,the lower incisors are in a stable position,with sequential bone apposition being presented on the lingual aspect.However,the upper incisors turn out to be labially relapsed along with the lingual bone resorption and labial bone apposition occurring simultaneously.
