智科眼

请选择以下任意方式登录

已有帐号?

验证码登录

微信登录

忘记密码
未收到验证码?
注册

微信注册

智科眼: 双语看懂新科研
材料科学 234
Researchers(研究人员) from(from) Tokyo(东京) Metropolitan(大都市) University(大学) have(have) discovered(发现) two(两种) distinct(不同) mechanisms(机制) by(by) which(which) foams(泡沫) can(可以) collapse(坍塌),(,) yielding(生产) insight(了解) into(into) the prevention(预防)/(/)acceleration(加速) of(of) foam(泡沫) rupture(破裂) in(in) industrial(工业) materials(材料),(,) e.g.,(e.g.,) foods(食品),(,) cosmetics(化妆品),(,) insulation(绝缘) and() stored(储存) chemicals(化学品).(.) When(When) a(a) bubble breaks(膜泡破裂),(,) they(他们) found(发现) that(that) a(a) collapse(坍塌) event(事件) propagates(传播) via(通过) impact(冲击) with(with) the receding(后退) film(薄膜) and() tiny() scattered(散射) droplets(液滴) breaking(破坏) other(其他) bubbles(气泡).(.) Identifying(确定) which(which) mechanism(机制) is(is) dominant(主导) in(in) different(不同) foams(泡沫) may(可能) help(有助于) tailor(定制) them(它们) to(to) specific(特定) applications(应用).(.)
Foams(泡沫) play(发挥着) a(a) key(关键) role(作用) in(in) a(a) wide range(各种) of(of) industrial products(工业产品),(,) including(包括) foods(食品),(,) beverages(饮料),(,) pharmaceuticals(药品),(,) cleaning(清洁) products(产品) and() cosmetics(化妆品).(.) They(它们) have(have) material(材料) applications(应用) such as(例如) building(建筑) insulation(隔热),(,) aircraft(飞机) interiors(内饰) and() flame-retardant(阻燃) barriers(屏障).(.) They(它们) might also(也可以) be(be) an(一个) unwanted(不需要) property(特性) of(of) a(a) product(产品) of(of) frothing(发泡) in(in) stored(储存) chemicals(化学品) during(during) transit(运输).(.) From(From) a(a) scientific(科学) perspective(角度),(,) they(它们) also() constitute(构成) a(a) unique(独特) form(形式) of(of) matter(物质),(,) a(a) fine balance(精细平衡) between(between) the complex(复杂) network(网络) of(of) forces(压力) acting(作用) on(on) the liquid film(液膜) network(网络) that(that) makes(品牌) up(up) its() structure(结构) and() the pressure(压力) of(of) the gas trapped(气藏) inside(内部).(.) Understanding(了解) how(如何) foams(泡沫) behave(行为) may(可能) yield(产生) new(新的) physical(物理) insights(见解),(,) as well as(以及) better(更好) ways(方法) to(to) use(使用) them(它们).(.)
Naoya(Naoya) Yanagisawa(Yanagisawa) and() Associate Professor(副教授) Rei(Rei) Kurita(Kurita) set out(开始) to(to) observe(观察) how(如何) foams collapse(泡沫结构破坏).(.) They(他们) took() a(a) solution(溶液) of(of) water(),(,) glycerol(甘油) and() a(a) common(普通) surfactant(表面活性剂) (a((a) film(薄膜)-()stabilizing agent(稳定剂))()) and() created(创建) a(a) two-dimensional(二维) foam(泡沫) squashed(压扁) between(between) two(两个) pieces() of(of) glass(玻璃).(.) Using(使用) an(一个) ultra-fast(超快) camera(相机) and() a(a) needle(针头),(,) they(他们) were(were) able(能够) to(to) controllably(可控制地) break() a(a) bubble(气泡) at(at) the edge(边缘) of(of) the foam(泡沫) raft() and() observe(观察) collective(集体) bubble(气泡) collapse(坍塌) (CBC).((CBC).) They(他们) identified(确定) two(两种) distinct(不同) ways(方式) in(in) which(which) the breakage(破坏) of(of) one(一个) bubble(气泡) at(at) the edge(边缘) led(LED) to(to) a(a) cascade(级联) of(of) breakage(破碎) events(事件) around(周围) it,(it,) a(a) propagating(传播) mode(模式) due to(由于) the absorption(吸收) of(of) the film(薄膜) of(of) the broken bubble(破裂泡孔) into(into) surrounding(周围) liquid film(液膜),(,) and() a(a) "(")penetrating(穿透)"(") mode(模式) due to(由于) the release(释放) of(of) droplets(液滴) from(from) the rupture(破裂) event(事件) flying() away(away) and() breaking(破裂) other(其他) bubbles(气泡).(.)
As(As) the investigators(研究人员) changed(改变) the amount() of(of) water() in(in) the film(胶片),(,) they(他们) identified(确定) several(几个) key(关键) trends(趋势) in(in) how(如何) the bubbles(气泡) react(反应) at(at) a(a) microscopic(微观) level(水平).(.) For example(例如),(,) they(他们) found(发现) that(that) more(更多) liquid(液体) in(in) the foam(泡沫) led(LED) to(to) the release(释放) of(of) slower() droplets(液滴),(,) which(which) are(are) unable(不能) to(to) penetrate(穿透) surrounding(周围) films(薄膜).(.) This() was(was) correlated(相关) with(with) a(a) drastic(剧烈) drop(下降) in(in) the number(次数) of(of) bubbles(气泡) collapsed(崩溃);(;) CBCs(CBCS) were(were) thus(因此) crucially(至关重要) underpinned(支撑) by(by) the penetrating() mode(模式) of(of) collapse(坍塌).(.) Droplet(液滴) speed(速度) was(was) determined(决定) by(by) the speed(速度) at(at) which(which) the film(薄膜) receded(退去);(;) this() streaming() velocity(速度) was(was) found(发现) to(to) be(be) proportional(比例) to(to) the osmotic pressure(渗透压) of(of) the film(薄膜),(,) i.e.,(i.e.,) the pressure() at(at) which(which) a(a) liquid(液体) brought into(进入) contact(接触) with(with) the foam(泡沫) is(is) driven() into(into) the film(胶片) network(网络).(.) The team(团队) showed(表明) that(that) the Navier-Stokes equations(纳维-斯托克斯方程),(,) key(关键) relations(关系) describing(描述) how(如何) fluids(流体) behave(行为) over(over) time(时间),(,) could(可能) be(be) used(使用) to(to) explain(解释) these(这些) trends(趋势).(.)
A(A) key(关键) finding(发现) was(was) that(that) changing(变化) the viscosity(粘度) of(of) the fluid(流体) did(did) not() lead to(导致) a(a) significant(显著) change(改变) in(in) the number(数量) of(of) bubbles broken(膜泡破裂).(.) Methods(方法) to(to) stabilize(稳定) foams(泡沫) commonly(通常) rely(依赖) on(on) changing(改变) the viscosity(粘度),(,) yet(然而) the team(团队)'s('s) findings(研究结果) clearly(清楚地) show(显示) how(如何) both(both) the number(数量) of(of) bubbles(气泡) collapsed(坍塌) and() the velocity(速度) of(of) the receding(后退) film() are(are) unaffected(不受影响).(.) Coupled(耦合) with(with) the dominant(主导) role played(角色扮演) by(by) the penetrating(渗透) mode(模式),(,) future(未来) strategies(策略) to(to) prevent(防止) foam collapse(泡沫结构破坏) may(可能) instead(代替) focus(焦点) on(on) combining(相结合) multiple(多种) surfactants(表面活性剂) to(to) make(使) the film(薄膜) more() resistant() to(to) droplet(液滴) impact(冲击).(.)
The study(研究) has(has) been(been) published(发表) online(在线) in(in) the journal(学报) Scientific(科学) Reports(报告).(.)

新闻订阅

  • 科学
  • 技术
  • 医学

新闻分享